Scanning collimation of light by flat lamp

FIELD: physics, optics.

SUBSTANCE: system for scanning collimated light comprises an optical waveguide, a system for inputting light into the first end of the optical waveguide and a controller for controlling position along the first end of the optical waveguide. The optical waveguide comprises a first end, a second end opposite the first end, a viewing surface which continues at least part between the first end and the second end, a back surface opposite the viewing surface, and an end reflector located at the second end of the optical waveguide. The end reflector comprises one or more polyhedral lens structures and a diffraction grating.

EFFECT: high efficiency of scanning collimated light.

13 cl, 16 dwg

 

The LEVEL of TECHNOLOGY

Many lamps contain a light source in the housing, which is configured to concentrate the light in the desired direction. For example, in the case of the projector or on the lighthouse concentration such that the light, in fact, must be collimated, when the rays emerge from the light source in parallel. In many cases, it is preferable that the direction of callmerobbie could be scanned. This can be implemented using traditional lamps, for example, by rotation of the whole lamp, or the rotation of the lenses and mirrors around the light source. However, such mechanisms scan may not be appropriate for use in some devices, such as display devices, due to geometric and other factors.

The INVENTION

Accordingly, in this document are disclosed various embodiments of which include scanning the collimated light. For example, one disclosed an implementation option provides a system for scanning collimated light, the system contains an optical wedge, the input light, configured to introduce light into the optical wedge, and a controller. The optical wedge contains a thin end and a thick end, opposite the thin end of the observed surface, continuing at least partially between the at thick end and a thin end, and a rear surface opposite to the observed surface. The thick end of the optical wedge further comprises end reflector structure containing multi-faceted lens. A controller configured to control the input light, to control the location along the thin end of the optical wedge, in which the input light enters the light.

This invention is provided to introduce a selection of concepts in a simplified form, which further described below in the detailed description. This entity is not intended to identify key features or essential features of the proposed subject matter of the invention and is not intended to be used to limit the scope of the claimed subject matter. In addition, the claimed subject matter is not limited to implementations that solve any or all disadvantages noted in any part of this disclosure.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 shows a variant implementation of the optical system configured to scan the collimated light.

Figure 2 is a schematic top view showing a variant of implementation of the optical wedge.

3 and 4 show the tracks rays through views in the context of choices made is I in figure 2.

Figure 5 shows a schematic enlarged view in cross section of the end reflector option implementation in figure 2.

6 and 7 show the tracks of rays through an implementation option in figure 2, as the path through the stack of duplicates option implementation in figure 2.

Fig and 9 illustrate a scanning collimated light by means of light input into the optical wedge in figure 2 at different locations along the thin end of the optical wedge.

Figure 10 shows the block diagram of the sequence of operations illustrating a variant of the method of scanning collimated light.

11 shows a block diagram of the sequence of operations illustrating a variant of the method of use of collimated light to display an open and confidential information through various modes on the display device.

Fig shows a block diagram of the sequence of operations illustrating a variant of the method for using collimated light to display autostereoscopic image.

Fig shows a variant implementation of the system input light containing multiple light sources.

Fig shows a variant implementation of the system input light contains one mechanically scanning light source.

Fig shows vari the NT implementation of the system input light, containing acousto-optic modulator, the laser and the scattering screen.

Fig shows a block diagram of the sequence of operations illustrating a variant of the method of use of collimated light to display different images to different observers at the same time.

DETAILED description of the INVENTION

Various embodiments of disclosed in this document and are ready to scan the collimated light through the flat lamp. Flat lamp is a panel having a flat surface from which radiates light. These lamps can be used, for example, as the rear lighting for panels with liquid crystal display (LCD). Some flat lamp can contain, for example, many fluorescent light tubes contained within a casing which contains a panel of the diffuser, through which light exits the panel. Other flat lamp may include an optical wedge to deliver light from the light source to the desired destination. The optical wedge is a waveguide that allows light entered on the edge of the optical wedge, dispersed in an optical wedge by means of total internal reflection to achieve the critical angle for internal reflection and is output from the optical wedge.

Currently, the flat lamp often is th are used as sources of scattered light. However, in some situations, it may be desirable to emit the collimated light from the bulb. For example, in some conditions of use it may be desirable to display the image through the LCD panel so that the image can be seen only from certain angles, thus retaining the displayed information confidential to target observers. The use of collimated light as backlight the LCD panel may allow such a display design that the image on the display can be seen only when light rays enter the eye of the observer from the display.

Additionally, with such a display may be preferable to the direction of the light can be scanned, so that the angle at which the image is visible, can be moved. Additionally, if the lighting direction can quickly switch back and forth between a pair of eyes or a few pairs of eyes, while the image on the liquid crystal panel is switched between one or more pairs of species a three-dimensional object, it can display a three-dimensional image. Therefore, in this document disclosed embodiments of relating to flat lamps, which emit collimated light, and which allow you to scan angle callmerobbie svetan accompanying drawings, it should be noted that the types illustrated embodiments may be presented not to scale, and proportions of some features may be exaggerated to make the selected characteristics or relationships easier to understand.

Figure 1 shows a variant implementation of the optical system in the form of a computing device containing a display configured to output the collimated light. Optical system 10 includes a spatial light modulator 12 and the scanning system collimated light. The spatial light modulator 12 includes a matrix of pixels, each of which can be used to modulate light from a backlight, taking into account color and intensity. In some embodiments, the implementation of the spatial light modulator may include a liquid crystal display device, but can also be used with other light modulating devices. A controller, such as controller 14 may provide the display data to the spatial light modulator 12. When the observer 15 is located on the optical path of collimated light and the collimated light modulated by the spatial light modulator 12 through the image delivered from the controller 14, the image may be viewed by the observer 15.

The optical system 10 further comprises a system of 16 input light and an optical wedge 100. Some embodiments of can additionally contain optional camera 18 track movement of the head and the redirector 20 light located next to the observed surface of the optical wedge 100. As described in more detail below, the collimated light emitted from the observed surface of the optical wedge 100, when the light is introduced into the thin end of optical wedge 100. Collimated light exits from the optical wedge 100 with a small angle relative to the plane of the observed surface of the optical wedge 100. The redirector 20 light can be used to redirect the collimated light onto the spatial light modulator 12. Any suitable structure can be used as a redirector 20 light. In some embodiments, the implementation of the redirector 20 light may contain a layer of prisms, for example.

System 16 of the input light can be configured to inject light into one or more locations along the thin end of optical wedge 100. Changing the location where the light is introduced into the thin end of optical wedge 100, the direction of the collimated light, leaving the observed surface of the optical wedge 100 may be adjusted.

In one exemplary embodiment, assests the tion, illustrated on Fig, the system 16 input light may contain a variety of individually controllable light sources such as light emitting diodes (LED) or other suitable light sources located near the thin end of optical wedge 100. The change which the light source shines, or what light sources simultaneously Shine, allows control of the direction in which collimated light is emitted from the optical wedge 100. For example, one source 1302 light from multiple light sources on Fig can glow. In other embodiments, implementation, such as illustrated in Fig, one mechanically scanning the source 1402 light can be used to change the location along the thin end of the optical wedge, in which light is introduced. The position of the light source can be changed from one side of the optical wedge 100, such as location 1404, on the opposite side of the optical wedge 100, such as location 1406. In another embodiment, such as illustrated in Fig, the system 16 input light may contain a source 1502 and light scattering screen 1504. The scattering screen 1504 is located and extends along the thin end of optical wedge 100. The light may be injected into the thin end of optical wedge 100, when the laser beam to form the p source 1502 light, goes to the scattering screen 1504, and the scattered light is reflected from the diffuse screen 1504 on the thin end of optical wedge 100. Source 1502 light may include a laser and an acousto-optic modulator or a liquid-crystal hologram to control the direction of the laser beam. The laser beam may be directed to the location 1506, as shown, or the laser beam may be scanned from one side of the scattering screen 1504, for example from 1508 location to the opposite side of the scattering screen 1504, for example in the location 1510.

Since the optical wedge 100 is configured to colliergate light, the input light from one location can provide collimated light to be transmitted in one direction so that the projected image is visible only in a narrow range of angles. This may provide the ability to display information in a confidential mode. On the other hand, the light input from more than one place at the same time can provide collimated light to be transmitted in more than one direction, which may provide an opportunity for the projected image to be visible in a wider range of angles. This display mode can be called in this document open mode. It will be understood that these examples are directed by the MOU display describes the purpose of illustration and are not intended in order to be limiting in any way.

According to Figure 1, the controller 14 may be configured to independently and selectively excite each light source system 16 input light according to the system mode. Thus, the controller 14 can control the location along the thin end of the optical wedge, in which the system 16 input light enters the light. In addition, the controller 14 may be configured to provide display data to the spatial light modulator 12 and receive data from the camera 18 tracking head motion. Data from the camera 18 tracking the head movements can be analyzed by the controller 14 to determine the location of the head and/or eye of the observer. Data from the camera 18 track motion of the head can be the original image data, or may be pre-processed, so that the different characteristics of the image are extracted, before transmitting data to the controller 14. The controller 14 may also define and save mode for the optical system 10 and to control the optical system 10 in accordance with this mode. The controller 14 may be any computing device configured to execute instructions that may be stored on machine-readable media storing information, such as memory 22. The processor 24 can be used too, to execute instructions stored in memory 22, with instructions include program to perform the methods of control for the optical system 10.

It is clear that the optical system 10 is described as an example, and that the optical collimator according to the present invention can be used in any suitable terms of use. Additionally, it will be understood that the optical system, such as depicted in the embodiment in figure 1, may include various other, not shown systems and functionality, including but not only, based on the vision detection system touch.

According to Figure 2, the optical wedge 100 is configured to colliergate light from the source light 102 located near the thin end 110 of optical wedge 100, so that the collimated light exits the observed surface 150 of the optical wedge 100, as shown by tracks rays in figure 2. The expression "the observed surface" indicates that the observed surface 150 is closer to the observer than the rear surface (not visible in figure 2), which is the opposite of the observed surface 150. Each of the observed and rear surfaces is limited by the sides 130 and 140, a thin end 110 and a thick end 120. In figure 2 the observed surface 150 facing the observer of the page, the rear surface is hidden in this kind of optical wedge 100.

The optical wedge 100 is configured so that the beams of light introduced into the light border thin end 110, is dissipated by means of total internal reflection, when they reach the large end 120 containing end reflector 125. In the depicted embodiment, the end reflector 125 is curved with a uniform bend radius, with the center of the curve 200, and the light source 102 enters the light in the focal point of the end reflector 125, focal point is half the bend radius. On the large end 120 of each of the rays of light reflected from the end reflector 125 in parallel to each of the other beams of light. The rays of light move from the thick end 120 to the thin end 110, while the light rays do not intersect the observed surface 150 under the critical angle of reflection of the observed surface 150, and the light rays emerge as collimated light. In an alternative embodiment, the end reflector 125 may be parabolic or may have other suitable curve for collimated light.

Options for implementation, which contain many light sources located near and along the thin end 110 to correct the curvature of field of the display and/or spherical aberration, can be preferred shorter sides 130 and 140 of optical wedge 100, so that the light source with any of the parties is from the center line 210 may remain in the focal point of the end reflector 125. Shortening of the sides 130 and 140 may make the thin end 110 is convex, as illustrated by curve 115. Suitable curve can be found by ray-tracing algorithm to track the rays of the critical reflection angle of the observed surface 150 of the optical wedge 100 back through the optical wedge 100, while the rays will not reach focus near the thin end 110.

3 and 4 show the tracks rays through schematic view in section of optical wedge 100. Figure 3 shows the path of the first beam 300 through the optical wedge 100, and Figure 4 shows the path of the second beam 400 through the optical wedge 100, with rays of 300 and 400 represent beams located on opposite sides of the cone of light that is injected into the thin end 110 of optical wedge 100. As you can see in figure 3 and 4, the beam 300 is out of the observed surface 150 with a thin end 110 of optical wedge 100, while the beam 400 is out of the observed surface 150 near the thick end 120 of optical wedge 100.

Beams 300 and 400 out of the observed surface 150, after the rays of 300 and 400 cross the observed surface 150 at an angle less than or equal to the critical angle of internal reflection relative to the normals of the observed surface 150. This critical angle can be called in this document "the first critical angle". Similarly, the rays are reflected internally in pricescom wedge 100, when the rays intersect the observed surface 150 at an angle greater than the first critical angle of internal reflection relative to the normals of the observed surface 150. Additionally, the rays are reflected internally in the optical wedge 100, when the rays intersect the rear surface 160 at an angle greater than the critical angle of internal reflection relative to a normal of the back surface 160. This critical angle can be called in this document "the second critical angle".

As explained in more detail below with reference to Figure 5, it may be preferable that the first critical angle and the second critical angle were different, so that light incident on the rear surface 160 of the first critical angle, is reflected back to the observed surface 150. This can help prevent loss of light through the rear surface 160 and, therefore, can increase the optical efficiency of the optical wedge 100. The first critical angle is a function of the refractive index of optical wedge 100 and the refractive index of the material interacting with the observed surface 150 (e.g., air or coating layer), while the second critical angle is a function of the refractive index of optical wedge 100 and the material adjacent to the rear surface 160. In some of the options which implementation such as shown in Fig.3-4, the coating layer 170 may be applied only to the rear surface 160, so that the observed surface 150 is bordered by air. In other embodiments, implementation of the observed surface 150 may include a coating layer (not shown) with a refractive index other than the back surface 160.

Any suitable material or materials may be used as the coating layers to achieve the required critical internal reflection angles for the observed and/or back surfaces of the optical wedge. In an exemplary embodiment, the optical wedge 100 is formed of polymethylmethacrylate or PMMA with a refractive index 1,492. The refractive index of air is approximately equal to 1,000. Essentially, the critical angle of the surface without covering approximately 42.1 degrees. Similarly, the approximate coating layer may contain Teflon AF (EI DuPont de Nemours & Co., Wilmington, Delaware), amorphous fluorocarbon resin with a refractive index of 1.33. Critical angle for PMMA surface coated with Teflon AF equal 63,0 degrees. It is clear that these examples are described for illustration and are not intended to limit the invention in any way.

Configuration of optical wedge 100 and an end reflector 125 may be configured to evenly illuminate a substantial the part of the observed surface 150, when uniform light is introduced into the thin end 110, and also to make the most of the input light to emerge from the observed surface 150. As mentioned above, the optical wedge 100 tapers along its length so that the rays entered along the thin end 110, is transmitted to the end reflector 125 due to total internal reflection. End reflector 125 contains the structure of the multi-faceted lens configured to reduce the beam angle relative to the normal to each of the observed surface 150 and back surface 160. In addition, reducing the thickness of the optical wedge 100 from the thick end 120 to the thin end 110 causes the orientation angles of rays to shrink relative to the normals of each surface, when the rays towards the thin end 110. When the beam falls on the observed surface 150 with a smaller angle than the first critical angle, the beam will emerge from the observed surface 150.

In some embodiments, the implementation of the source light 102 can be located in the focal point of the end reflector 125. In such scenarios, the implementation of end reflector 125 may be bent with a bend radius that is twice the length of the optical wedge 100. In the embodiment, figure 3-4 angle-narrowing optical wedge 100 is configured so that the angle at the thickest end 120 and the observed surface 150 with whom holds a right angle, and the angle on a thick end 120 and the rear surface 160 contains a right angle. When the thin end 110 is located in the focal point of the end reflector 125, thin end 110 is equal to half the thickness of the thick end 120. In other embodiments, the implementation of each of these structures may have any other suitable configuration.

In the depicted embodiment, the end reflector 125 spherical curves from edge 130 to the edge 140 and from the observed surface 150 to the rear surface 160. In other embodiments, the implementation of end reflector 125 may be cylindrically curves with a constant bend radius from the observed surface 150 and the rear surface 160 and the center of the bend, where the observed surface 150 and the rear surface 160 intersect in case of continuation. Cylindrically curved end reflector may resist bending is stronger than the spherically curved end reflector 125, which may be preferable in large format devices. Other suitable curvature can be used to end reflector 125, such as a parabolic curvature, for example. Additionally, the curvature of the end reflector 125 in the plane perpendicular to the sides 130 and 140 may be different from the curvature of the end reflector 125 in the plane parallel to the sides 130 and 140.

As described above, may be site is preferably, to critical reflection angles of the observed surface 150 and the rear surface 160 were different, to help prevent loss of light through the rear surface 160. This is illustrated in Figure 5, which shows a schematic enlarged view in section of the end reflector 125 variant implementation of the optical wedge in Fig.2-4. End reflector 125 contains the structure of the multi-faceted lens that contains many facets, placed at an angle relative to the surface of the large end 120. The many faces of alternating between faces turned to the observed surface 150, such as a face 530, and faces turned to the back surface 160, such as the edge 540. End reflector 125 corresponds to the total bending as described above, with the normal end 542 of the reflector and the normal end 532 of the reflector, continuing to the center of the bend. Each of the many sides has a height and angle relative to the normal to the end surface of the reflector. For example, one of the faces turned to the observed surface 150 has a height 538 and angle 536 relatively normal 532 end of the reflector and the normal 534 faces. As another example, one of the faces facing the rear surface 160 has a height of 548 and angle 546 relatively normal end 542 of the reflector and the normal 544 faces.

The height of each of the set g is Anya can affect the uniformity and brightness of the collimated light, emerging from the observed surface 150. For example, a greater number of faces may create optical paths that are different from the ideal focal length, which can cause banding (segmentation) Fresnel. Essentially, in the variants of implementation, where this banding can cause problems, it may be preferable to make the height of each of the many faces of less than 500 microns, so that kind of banding is less noticeable.

Similarly, the angle of each of the sets of faces can also affect the uniformity and brightness of the collimated light emerging from the observed surface 150. Beam 500 illustrates how the angles of the facets can affect the path of the beam through an optical wedge 100. Beam 500 is introduced into the thin end 110, moves through an optical wedge 100 and reaches the end reflector 125. Half of the beam reaches 500 faces 530, addressed to the observed surface 150. Part of the beam 500, reaching the verge 530, is reflected as beam 510 in the direction of the observed surface 150. Beam 510 crosses the observed surface 150 at an angle less than or equal to the first critical angle of internal reflection relative to the normal to the target surface 150, and thus, out of the observed surface 150 as the beam 512.

The other half of the beam reaches 500 faces 540 facing the back surface 160. Castellucia 500, reaching the brink 540, is reflected as beam 520 toward the back surface 160. Due to the difference between the critical angles of the observed surface 150 and the rear surface 160 of the beam 520 intersects the rear surface 160 at an angle greater than the second critical angle for internal reflection, relative to the normal to the back surface 160, and thus, is reflected as beam 522 in the direction of the observed surface 150. Beam 522 then crosses the observed surface 150 at an angle less than or equal to the first critical angle of internal reflection, relative to the normals of the observed surface 150, and, thus, emerges as beam 524. Thus, a large part of the world (in some embodiments, implementation, essentially all the light)that is reflected from the end reflector 125, comes from the observed surface 150.

Due to the fact that light is separately reflected faces turned to the observed surface 150, and faces turned to the back surface 160, overlapping, superimposed first and second images displayed in the orientation of the "head-tail", are formed on the observed surface 150 when light is reflected from the back surface to go from the observed surface. The degree of overlap between the two images can be defined by the angles of the faces 530 and 540. For example, two is zobrazenie completely overlap, when each face has an angle relative to the normal to the end surface of the reflector is equal to three eighth of the difference between ninety degrees and the first critical angle of reflection, as explained in more detail below. In this example, essentially all of the light introduced into the optical wedge 100, out of the observed surface 150. The deviation of the faces from this value reduces the amount of overlap between images, so that only one or the other of the two images is displayed, where the angles of the faces is equal to 1/4 or 1/2 of the difference between 90 degrees and the first critical angle of reflection. Additionally, changing the angles of the faces of three-eighths of the difference between ninety degrees and the first critical angle of reflection also causes some of the light going out from the thin end of optical wedge 100, but not with the observed surface 150. When the angles of the faces is equal to 1/4 or 1/2 of the difference between 90 degrees and the first critical angle of reflection, the observed surface can also be evenly lit, but half of the light goes from thin end of optical wedge 100 and, therefore, lost. It will be clear that, depending on the desired conditions of use, can be approached using the angles of the faces other than three-eighths of the difference between ninety degrees and the first critical angle of reflection to create a number of kiravannya light. Such terms may include, but not limited to, conditions in which non-overlapping region of light (which will appear to have a lower intensity relative to the overlapping areas) are not in the field of view observed by the user, but also the conditions where appropriate reduced the intensity of the light.

In an alternative embodiment, the structure of the multi-faceted lens of the end reflector 125 may include a diffraction grating. The equation of the lattice can be used to calculate the diffraction angle for a given angle of incidence and the wavelength of light. Since the angle of diffraction depends on the wavelength of light, the end reflector containing a diffraction grating, may be preferred when the input light is monochromatic.

6 and 7 illustrate the movement of light through an optical wedge 100 as paths of rays through the optical stack of wedges, each optical wedge is a duplicate version of the implementation of optical wedge 100, to further illustrate the concept, shown in figure 5. Ray tracing through a stack of duplicate optical wedge is optically equivalent to the trace of the beam path in the optical wedge. Thus, in this way, each internal reflection of the beam is shown as the passage of a beam through faces is the one optical wedge to the adjacent optical wedge. Figure 6 the observed surface is shown as the observed surface 620 of the upper wedge in the stack of optical wedges 600. The rear surface is shown as the back surface 630 of the lower wedge in the stack of optical wedges 600. The thick ends of the stack of optical wedges 600 are connected in a form that is approximately the curve 640, centered on the axis 610, where all surfaces converge in one point.

6 also depicts two light beam 650 and 660 that are located on opposite sides of the cone of light, which is introduced into the thin end of the stack 600 of the optical wedges. For each beam 650 and 660, after reflection from the end reflector, half of the beam is emitted close to the large end of the stack 600 optical wedges (and, therefore, presents an optical wedge), as shown in solid lines 652 and 662, and half of the beam is emitted from the thin end of the stack of optical wedges, as shown by the dotted lines 654 and 664. The rays entered at any angle between these two limits will also share through multi-faceted structure in the limit reflector and emitted from the observed surface and the back surface of the optical wedge in a similar way. The rays emerging from the observed surface 620 in parallel rays 652 and 662, represented by the shaded area 602. As mentioned above, it is clear that the beams are shown as emitted through the rear surface 630 of the optical wedge, can instead be reflected back by the surface and then out of the observed surface coating (not shown) on the rear surface of the optical wedge, which has a lower refractive index than the floor (not shown)used to observe the surface of the optical wedge. Thus, essentially all the light that entered into the thin end of the optical wedge, can be emitted from the observed surface of the optical wedge.

For the observed surface, which should be evenly lit (for example, where the image reflected from the edges 530 and 540, a fully overlap), the beam entered in the thin end and passing horizontally toward the end reflector coincides with the normal end of the reflector, is reflected from the faces turned to the observed surface, and moves to the center of the observed surface, crossing the observed surface at the critical angle of the observed surface. Fig.7 shows a schematic depiction of the path of such beam through a stack of optical wedges 700. Beam 710 is introduced into the thin end 702 of the optical wedge and is reflected from the end reflector 704 as the beam 715. Beam 715 moves to the centre of the observed surface 706, crosses the observed surface 706 under the critical angle of reflection 730 relatively normal 720 to observe the surface. The sum of the angles 732 and 734 equal to the difference between 90 degrees and the critical angle of reflection 730. When the thin end of the optical wedge is equal to half the thickness of the thick end of the optical wedge, the Central point of the wedge is equal to three fourth of the thickness of the optical wedge. Using the paraxial approximation the angle 732 equal to three fourth of the difference between 90 degrees and the critical angle of reflection 730. Horizontal line 722 introduced parallel beam 710, thus the angle 740 equal to the angle 732. From the law of reflection the angle of incidence equals the angle of reflection, so the angle of the face can be a half angle 740. Therefore, for the observed surface, which should be evenly lit, each face, turned to the observed surface may form an angle relative to the normal to the end surface of the reflector is equal to three eighth of the difference between 90 degrees and the critical reflection angle 730, as mentioned above.

Fig and 9 show how the direction of the collimated light can be changed by inputting light into the optical wedge in figure 2 at different locations along the thin end of the optical wedge. In particular, the direction of callmerobbie can be shifted to the left by shifting the location of the input light to the right and Vice versa. In each drawing, the apparent position of one pixel collimated light, known is th 800 and 900 on Fig and 9, illustrated for clarity. Additionally, the line is shown passing from a light beam in the corners of the boundary of light of the optical wedge, and the Central line 810 is shown to illustrate the movement of the light beam relative to the optical wedge in more detail, when the location of the input light is shifted.

On Fig light is introduced from a source 802 of the light in the first location in the right side of the thin end 110. The direction of the collimated light directed to the left from the Central line 810, as illustrated by the pixel in a visible position 800. Figure 9 the light is introduced from a source 902 light in the second location in the left side of the thin end 110. The direction of the collimated light is directed to the right from the Central line 810, as illustrated by the pixel in a visible position 900. It is clear that the collimated light can be scanned smoothly or in steps of any desired size, by changing the location of the input light on the thin side of the optical wedge 100 with the desired interval. This display mode may be referred to here as the scanning mode.

Figure 10 shows the block diagram of the sequence of operations of an exemplary method of scanning collimated light through the optical waveguide. The optical waveguide may include a first end, a second end, about Voprosy first end and containing end reflector, the observed surface extending between the first end and the second end, and a rear surface opposite to the observed surface. In one embodiment, the optical waveguide is an optical wedge in Figure 2, where the thin end of the optical wedge is the first end of the optical waveguide, and the thick end of the optical wedge is the second end of the optical waveguide. In an alternative embodiment, the optical waveguide may have a constant thickness, for example, the first end and the second end have the same thickness. The optical waveguide may include a coating on the observed and/or rear surface with a refractive index that varies linearly between the first end and the second end. This implementation is similar to the optical wedge, when light is introduced into the first end of the optical waveguide. In yet another embodiment, the optical waveguide may have a constant thickness, refractive index, which varies linearly between the first end and the second end, and a coating on the observed and/or rear surface with a constant refractive index. This implementation will also be similar optical wedge, when light is introduced into the first end of the optical waveguide.

According to Figure 10, the method 1000 begins at step is 1010 input light into the first end of the optical waveguide. As described above, the light may be a light source configured to mechanically move, for example, along the first end of the optical waveguide. In another embodiment, multiple light sources can be located along the first end of the optical waveguide, each light source configured to inject light into the first end of the optical waveguide in a different location along the first end of the optical waveguide. Light can enter one or more sources of light from multiple light sources. In yet another embodiment, the light may be entered by scanning a laser beam through the scattering screen, located adjacent and extending along the first end of the optical waveguide.

Next, at step 1020, the entered light is delivered to the end reflector by means of total internal reflection. At step 1030, the light may be internally reflected from an end of the reflector. The light internally reflected from an end of the reflector can be reflected from the first set of faces and the second set of faces, each face from the first set of faces is normal, which is oriented at least partially to the observed surface, and each face of the second set of faces is normal, which is oriented at least partially toward the rear surface is displacement. In addition, in some embodiments, implementation, each of the first set of faces can have an angle equal to three eighth of the difference between 90 degrees and the critical reflection angle, and each of the second set of faces can have an angle equal to three eighth of the difference between 90 degrees and the critical angle of reflection. In other embodiments, implementation of the faces can have other suitable angles, which do not cause unacceptable changes in light intensities. In yet another embodiment, the end reflector may include a diffraction grating.

Due to the angle at which the inclined end face of the reflector, at step 1040, a part of the light may be emitted from the observed surface, and this part of the world crosses the observed surface at the critical angle of reflection. Next, at step 1050, the location on the first end of the optical waveguide in which light is introduced into the optical waveguide can be changed. In one embodiment, the location on the first end of the optical waveguide can be changed by the mechanical movement of the light source to a desired location, and then the light may be injected into the desired location of the light source. In another embodiment, the location on the first end of the optical waveguide can be changed by choosing the full glow of the light source from a variety of light sources, located along the first end of the optical waveguide. In yet another embodiment, the location on the first end of the optical waveguide can be changed by scanning the laser through the scattering screen, next and continuing along the first end of the optical waveguide. Changing the location of the input light, the direction of the collimated light can be changed. As illustrated in Fig and 9, the light input in the left side of the thin end 110 of optical wedge 100 may cause radiation collimated light in the direction to the right from the optical wedge 100 and Vice versa.

11 shows a block diagram of the sequence of operations of an exemplary procedure that may be used to perform methods of using collimated light to display an open and confidential information during the different modes on the same optical system such as the optical system 10. Before describing 11, it should be clear that the use of the term "wedge" in the descriptions 11-12 and 16 is not intended to limit the applicability of this option, the implementation of optical fibers with an optical wedge, and that the light guide with the changing index of refraction, as described above, can also be used.

According to 11, at step 1110 determines the tunes display optical device. If the display mode is the open mode, the program proceeds from step 1110 to step 1150. If the display mode is confidential mode, the program proceeds to step 1120.

When the display mode is confidential, at step 1120, may be determined by the position of the observer. The position of the observer can be determined by the controller 14 using the tracking data of the movement of the head taken from the camera 18 tracking head movement, or can be assumed that the position is, for example, directly in front of the optical system 10. At step 1130, the position of the observer can be associated with one or more locations along the thin end of the optical wedge. Location along the thin end of the optical wedge can be chosen so that the observer is located on the optical path of collimated light emitted from the optical system 10, when light is injected in each of the locations, for example. At step 1140, the light may be injected in one or more locations along the thin end of the optical wedge. The input light in one location from a single light source can provide the narrow field of view optical system 10. However, it may be preferable to expand the field of view through the light input in more than one location. The extended field of view can pre order to provide an acceptable limit, if the calculated position of the observer inaccurate, for example, if the algorithm for determining the position of the head is slow compared with the speed of movement of the observer, for example. It will be clear that the field of view can be controlled by the user of the display, so that the confidential image can be mapped to any number of users located in any suitable position(s) around the display. The procedure ends after step 1140.

The method 1100 can be continuously repeated in a loop, so that the position of the observer can be updated, if the observer moves. Updating the position of the observer and the associated location along the thin end of the optical wedge, the collimated light from the optical system 10 can follow the observer, when the observer moves.

When the display mode is open, at step 1150, a wide field of view can be associated with many locations along the thin end of the optical wedge. For example, in some situations, all the light sources can be illuminated simultaneously, or a subset of the light sources may be illuminated simultaneously. In any case, as illustrated in step 1160, the light is introduced in many places along the thin end of the optical wedge, and the image may be displayed with a wide field of view.

Otkrytyj display can be used in a variety of ways, to display an image different number of observers. For example, it may be preferable to display the image to any observer that can have an immediate overview of the display screen. In this case, a wide field of view can be obtained by lighting all light sources from a variety of light sources arranged along the thin end of the optical wedge. On the other hand, some use the open mode can show some of the characteristics of sensitive display. For example, the display may be configured so that the Bank clerk and the customer, everyone can see the image that can be hidden to observers with another corner of the display, distinct from the corner for a Bank teller or customer. In this mode, the direction in which collimated light can be pre-determined on the basis of a sitting/standing position of the target observer, or may be determined by the camera or by other suitable method.

Fig shows a block diagram of the sequence of operations illustrating another variant implementation, which uses collimated light to display the confidential image (the same or different images) many observers at the same time. The method 1600 WA is placed on the stage 1610, where is the maximum number of observers. At step 1620, the current observer set as the first observer. At step 1630, the number of the current observer and the maximum number of observers are compared. If the number of the current observer exceeds the maximum number of observers, the procedure will end. If the number of the current observer is less than or equal to the maximum number of observers, the procedure may continue at step 1640.

At step 1640 is determined by the position of the current observer. The position can be defined by using data-tracking movements of the head, the position can be predefined (e.g., number and/or location of the positions can be controlled and/or set by a user or administrator), etc. At step 1650, the image associated with the current observer. The image may also be associated with other observers, so that many observers can see the same image. The location along the thin end 110 of optical wedge 100 may also be associated with the current observer at step 1650. The location along the thin end 110 may be selected so that the current observer will be located on the optical path of the collimated light emitted from the optical system 10, when the light is entered at the location of vdol the thin end 110 of optical wedge 100. At step 1660, the image may be modulated in the spatial light modulator 12. At step 1670, the system 16 of the input light can be used to introduce light into the thin end 110 of optical wedge 100, thus rendering the image in a current observer. At step 1680, the input light in the thin end 110 of optical wedge 100 is terminated. At step 1690, the number of the current observer is incremented, and the method continues at step 1630.

The method 1600 may be placed in the loop and can be repeated, so that one or more images may be presented to one or more observers at the same time. If the procedure is repeated fast enough, for example, the refresh rate is high enough, the eye of the observer can combine multiplexed time-image, associated with the observer, flicker-free image. Each observer has a different perception capabilities, but the desired refresh rate higher than 60Hz.

Fig shows a block diagram of the sequence of approximate procedures used to perform a method for displaying autostereoscopic images with collimated light. This display mode may be referred to here as autostereoscopic mode. At step 1210 determines the position of the first eye and the second is th eye of the observer. At step 1220 the first image and the first location along the thin end of the optical wedge associated with the first eye of the observer. The first image may be a three-dimensional object, which is observed, for example, the left eye of the observer. The left eye may be on the optical path of collimated light emitted by the optical system 10, when light is introduced into the first location along the thin end of the optical wedge. At step 1230, the first image is modulated in the spatial light modulator 12, and at step 1240, the light is introduced into the first location along the thin end of the optical wedge, thus representing the first image to the first eye of the user.

At step 1250, the input light in the first location along the thin end of the optical wedge is stopped, and at step 1260 the second image and a second location along the thin end of the optical wedge is associated with a second eye of the observer. The second image may be a three-dimensional object, which is observed, for example, the right eye of the observer. The right eye may be on the optical path of collimated light emitted by the optical system 10, when the light is introduced in the second location along the thin end of the optical wedge, for example. At step 1270, the second image may be a module is identified in the spatial light modulator 12. At step 1280, light can be introduced from the second location along the thin end of the optical wedge, thus representing the second image to the second eye of the user.

At step 1290, the light input from the second location along the thin end of the optical wedge is terminated. The method 1200 may then be repeated, so that the first set of images is displayed to one eye, and the second set of images is displayed to the other eye. If the procedure is repeated fast enough, for example, the update frequency is high, the eye of the observer can combine multiplexed in time flicker-free images in the scene. Each observer has a different perception capabilities, but the desired refresh rate higher than 60Hz.

A three-dimensional effect can be amplified if the observer can move his head and see what the image is changed accordingly. To create this effect, many of adjacent images can be displayed in rapid succession, so that each image is observed under a slightly different angle. For example, in one embodiment, the set of adjacent images may include 32 images, representing 32 species of three-dimensional scenes. Because each eye of the observer sees the display under slightly different angle is ω, each eye can see a different image, and the scene looks three-dimensional. In addition, many observers can also see the three-dimensional image, when each eye is represented by different image.

To the observer saw the image light from the image should be in the eye of the observer. The optical system 10 in figure 1 can provide autostereoscopic viewing, when the spatial light modulator 12 is small, for example, the size of the pupil. When the size of the spatial light modulator 12 is increased, the optical system 10 may include additional optical elements such as Fresnel lens, next to the spatial light modulator 12.

It is clear that the computing devices described herein, can be any suitable computing device configured to execute the programs described in this document. For example, the computing device may be a universal computer, a personal computer, portable computer, portable digital assistant (PDA), wireless phone with the functionality of the computer, network computing device, or other suitable computing device and can be connected to each other through a computer network such as the Internet. This is acyclically devices typically include a processor and associated volatile and non-volatile memory and configured to execute programs stored in non-volatile memory, using part of the volatile memory and the processor. As used herein, the term "program" refers to software components or firmware that may be executed or used by one or more computing devices described herein, and is meant to encompass individual files or groups of executable files, data files, libraries, drivers, scripts, database records, etc. Will be clear that there can be provided a machine-readable storage media storing information having software instructions stored on them, which when executed by the computing device cause the computing device to perform the methods described above, and cause the work systems above.

It is clear that the specific configurations and/or approaches described in this document for scanning collimated light, is presented for the purpose of example, and that these specific embodiments of, or examples should not be construed in a limiting sense, because numerous variations. The essence of the present invention includes all new and implicit combination and auxiliary combination of various processes, systems and proc is goracy, and other features, functions, actions and/or properties disclosed herein, as well as any or all of the cash equivalents.

1. System scanning collimated light includes:
the optical waveguide (100)containing:
the first end (110),
the second end (120), opposite the first end,
the observed surface (150), continuing at least partially between the first end and the second end,
the rear surface (160)opposite to the observed surface, and
end reflector (125), located on the second end of the optical waveguide and the end reflector includes one or more structures multifaceted lens and diffraction grating;
the system (16) of the light input configured to input light into the first end of the optical waveguide; and
the controller (14), configured to manage the location along the first end of the optical waveguide, in which the input light enters the light.

2. The system according to claim 1, in which the input light contains many light sources arranged along the first end of the optical waveguide, each light source configured to inject light into the first end of the optical waveguide in a different location along the first end of the optical waveguide.

3. The system according to claim 2, in which the controller is configured to od is vremenno to excite two or more light sources from a variety of light sources, to display the image along more than one direction.

4. The system according to claim 2, in which the controller is configured to initiate one source of light from multiple light sources to display an image along one direction.

5. The system according to claim 2, in which the controller is configured to sequentially excite multiple light sources to display autostereoscopic image.

6. The system according to claim 2, additionally containing camera motion tracking of the head, and the controller is additionally configured to receive data from camera motion tracking of the head and forming the data track the movement of the head.

7. The system according to claim 6, in which the system further comprises two or more selectable modes containing confidential mode and the open mode, private mode for directing the collimated light to one observer, the open mode for directing the collimated light to more than one observer; and
the controller is additionally configured to initiate one or more sources of light from multiple light sources according to the system mode and data tracking head motion.

8. The system according to claim 2, in which the controller is additionally configured to sequentially excite mn is the number of light sources, to display one or more images to one or more observers.

9. The system according to claim 1, in which the input light contains a diffusing screen placed along the first end of the optical waveguide, and a light source configured to generate a laser beam, which is scanned along the scattering screen.

10. The system according to claim 1, additionally containing a light redirector, situated close to the observed surface and configured to receive the light from the observed surface to redirect light received from the observed surface.

11. The method (1000) scanning collimated light through the optical waveguide (100, and the optical waveguide includes a first end (110), second end (120), opposite the first end and containing end reflector (125), the observed surface (150), continuing between the first end and the second end, and a rear surface (160)opposite to the observed surface, the method includes
enter (1010) light in the first end of the optical waveguide;
delivery (1020) light to the end reflector by means of total internal reflection;
internal reflection (1030) light from an end of the reflector;
radiation (1040) the first part of the light from the observed surface at the critical angle of reflection;
internal atragene is (522) of the second part of the light from the back surface at an angle, equal to the critical angle of reflection, and then radiation (524) of the second part of the light from the observed surface after internal reflection of the second portion of light from the back surface; and
change (1050) along the first end of the optical waveguide where light is introduced into the optical waveguide.

12. The method according to claim 11, in which the input light into the first end contains the input light from a light source, configured to generate a laser beam, which is scanned along the diffusing screen placed along the first end of the optical waveguide, and in which the change in location along the first end of the optical waveguide in which light is introduced into the optical waveguide includes scanning the laser beam along the scattering screen.

13. The method according to claim 11, in which the input light into the first end contains the input light from multiple light sources, and in which the change in location along the first end of the optical waveguide in which light is introduced into the optical waveguide contains selective excitation light source from multiple light sources.



 

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