Controlling illumination device

FIELD: physics.

SUBSTANCE: illumination device (1) comprises, for example, diodes LED (L1, L2, L3, L4) with separate emission spectra. Detectors D1, D2, D3, D4) can generate a vector of measurement signals (S1, S2, S3, S4) which represent light output of one active light emitter. Further, based on a linear relationship obtained during the calibration procedure, the characteristic value of the light output of that light emitter (L1, L2, L3, L4) is calculated using the measurement vector, wherein said characteristic value is based on the decomposition coefficient of an individual emission spectrum on basic functions.

EFFECT: improved method.

25 cl, 6 dwg

 

The invention relates to a lighting device containing a light emitter and sensor. In addition, it relates to a method of controlling such a lighting device.

WO 02/080625 discloses a lighting device containing diodes LED red, green, and blue glow and photodiodes with filters that make them sensitive to different colors. On the basis of the measurement data of the photodiodes, calculate values tricolor point, which is then used to control the LEDs in a loop with feedback.

US 2004/135522 A1 discloses a lighting device with multiple LEDs of different colors. This device is calibrated by means of the spectrometer radiation.

US 5965873 refers to the spectrometer, containing a number of photodiodes with different spectral sensitivity. Specific basic functions of design, so that they approximiately range, which should be measured when they are a linear combination with coefficients that correspond to the measurement signals of the photodiodes.

The use of linear models to describe the spectra of the light source and coatings has been described in the literature (MARIMONT et al., Journal of the Optical Society of America A (Optics and Image Science) USA, vol.9, no.11 (1992), pages 1905-1913).

WO 03/058184 And reveals the measuring range of sensors which are sensitive to red, green and blue, respectively, and calculated the e values tricolor point, based on the measurements.

From 2003/0133117 A1 is known a lighting device containing light-emitting diodes (LED) red, green, and blue glow and the appropriate sensor with a maximum sensitivity in the spectral range of red, green and blue respectively. Tri-color point (X, Y, Z) of the entire device lighting is estimated linear function, i.e. a matrix product, signal measurement. However, to achieve greater accuracy in the calculation must also be considered works of the highest order.

Based on this situation, the aim of the present invention is to provide a means for easy and precise control of the lighting device with multiple light emitters.

This objective is achieved by a lighting device according to claim 1 and a method according to claim 2. Preferred embodiments of disclosed in the dependent claims.

According to the first aspect of the invention it relates to a lighting device containing the following components:

a) At least one light emitter with a separate light output. The said light emitter may be a single lamp or a combination of several identical or different lamps.

b) At least two sensors for generating measurement signals, which correspond to the individual light output Viseu manutoo light emitter.

"The light exit light emitter is usually determined by its spectrum, that is, the intensity of emitted light depending on the wavelength, per unit wavelength (unit: W/nm). During the measurement, this range of roll with the curve of the spectral sensitivity of the measuring device.

c) an evaluation Unit for evaluation on the basis of the above signals to measure at least one characteristic values of the individual light output of the light emitter, and mentioned characteristic value based on the coefficients of the decomposition of the spectrum of the light emitter for a given set of basis functions. Preferably one or more characteristic values are determined sequentially for multiple light emitters available in the lighting device (optionally, for all light emitters device), and mentioned characteristic values can be the same type or of different types.

The above-mentioned basic functions serve as a kind of virtual light emitters, which are usually reproduce the spectrum of the light emitter, provided that they are managed in accordance with the mentioned coefficients. When approximating the spectrum of the light emitter base functions can be described with good accuracy by a limited number of values of the s (coefficients). This simplification provides the ability to easily manipulate individual spectra, for example, by a linear relationship. Of course, the expansion coefficients for a given set of basis functions can be described not only the range of one light emitter, but also the spectra of all light emitters in the lighting device.

According to the second aspect of the invention relates to a method of controlling a lighting device, at least one light emitter. This method contains the following steps:

a) Generating measurement signals, which correspond to the individual light output of the above-mentioned light emitter.

b) Assessing at least one characteristic values of the individual light output of the light emitter based on the above signals, measurements, and mentioned characteristic value based on the coefficients of the decomposition of the spectrum of the light emitter for a given set of basis functions.

The method comprises in General form the steps that can be performed with the lighting device according to the first aspect of the invention. So for more information about the details, advantages and improvements of this method reference is made to the previous description.

The following describes preferred embodiments of the invention, which include the I to the lighting device, and by the way according to the invention.

Practically, the lighting device usually contains two or more light emitters that can be managed independently and are, therefore, also possible to separately measure the sensors. In this case, the characteristic value can be estimated for each of the light emitters. Despite the fact that, in General, each light emitter may be associated with a separate set of basis functions, preferred to simplify processing the same set of basic functions for all spectra of light emitters.

The shape of the basis functions of arbitrary provided that through them it is possible to describe or reproduce spectra with sufficient accuracy. Since the General form of the spectrum of the light emitter is usually known in advance, the basis functions is preferable to choose such that they can be approximated to any specific range of this form with sufficient accuracy. Basic functions can, for example, be bell-shaped. This provides the possibility of forming a specified range based on local deposits. In addition, the basic functions can be piecewise linear polynomials, b-splines, or any other form that is suitable for the approximation of the specific spectrum of light emitter.

In addition, the number of basis functions that are used is carried out for formation (decomposition) of a given spectrum, in principle, arbitrary. However, it is preferable that the above-mentioned number was identical to the number of independent signals of the measurement (i.e. the number of independent sensors in the lighting device). In this case, the measurement signals provide just enough information to determine the expansion coefficients of the specified range of basic functions.

The coefficients determine (at least approximately) spectrum itself. Accordingly, any value that depends on the spectrum can also be determined. In a particularly important example of the color point (relative to a predefined color space) of the light emitter is calculated on the basis of coefficients of decomposition.

In the General case, the relationship between the characteristic value cv, coefficients of decompositionαand signals measurementScan be arbitrary, in particular non-linear. However, there may be more than simple mathematical processing, if at least some of the relations in the composite displaySα→cv line.

Respectively, may, for example, be a linear relationα→cv between the characteristic value and the expansion coefficients, and the above-mentioned ratio is preferably described by the matrix (link).

In addition, there may be linear from osenia Sαbetween the measurement signals and the expansion coefficients, and the above relation is also preferably described by the matrix.

Finally, there may exist a linear relationS→cv between the characteristic value and the measurement signals. This is especially the case if there are two above-mentioned linear relationship.

If there is one or more of the above-mentioned linear relationship, then the processing of the vector signal measurements may (at least partially) be made simple and fast matrix multiplication, and the coefficients of the above matrix is usually calculated and stored in advance.

In a preferred embodiment, the above-mentioned cases, the coefficients of linear relations (i.e. the components of the associated matrices) are determined in the calibration procedure, which contains a stand-alone operation only one of the light emitters (if there are several). If individual control of each light emitter his contribution to the measurement signals can be filtered and recorded in the coefficients of linear relations.

According to the further processing of the above calibration, the light emitters, which are operated separately measured under different operating modes, for example when different currents, temperatures, etc. Accordingly, the range of the he spectra, which may be formed from the said light emitter, will be investigated and recorded in the coefficients of linear relations.

In one embodiment, the lighting device and/or process the measurement signals generated by sensors with different spectral sensitivity curves. Different spectral sensitivity curves ensure that the measurement signals are independent of the characteristics of the emitted spectra.

In furthering the above-mentioned variant of implementation, the sensors contain a photodiode, which is covered with a dielectric layer. Through proper choice of dielectric material and/or a specific layer thickness of the dielectric can be achieved at various intervals of the filter such that the combination of the dielectric layer and the photodiode displays an oscillating curve sensitivity, which passes over the wavelength range of the lighting device. The dielectric layer preferably contains silicon dioxide (SiO2), titanium dioxide (TiO2and/or nitride of silicon (Si3N4). The thickness of the dielectric layer is preferably in the range from 50 nm to 2.5 μm, most preferred range is from 100 nm to 800 nm. The dielectric layer may be of uniform thickness across the photodiode. Alternatively, the thickness of the dielectric layer majestics, for example, if the layer has the shape of a wedge. The dielectric material must be transparent to light, which must be detected.

If the sensors contain a photodiode, preferably, this photodiode was integrated into the substrate, which is equipped with the light emitters. This substrate may, for example, be made of silicon (Si).

According to another variant of the invention, the lighting device includes a controller that is configured to individually control one or more light emitters based on the estimated(s) of characteristic(s) of value(s). This controller may, for example, to control multiple light emitters so that the total light emitted optimally matches a specified color point. In this respect, the "optimum" means that the light output of the lighting device (i) corresponds exactly to the predetermined color point or (ii) is an approximation of the above color point in a predetermined color space with a predetermined metric of color differences as accurate as possible with the used of the light emitters. Specialists in the art can easily develop a suitable model of the controller for successful feedback control of the light emitted by the lighting device is. Examples of suitable controllers can also be found in the literature (see, for example, US 2005/122065 A1, US 2003/111533 A1, US 2005/062446 A1). In a preferred embodiment, the controller includes a memory (e.g. RAM, ROM, EPROM, hard disk, etc.), which contains the calibration relationship between the respective values.

In principle, there can be any geometric arrangement of the light emitters and sensors. In a preferred embodiment, the sensors are dispersed between the light emitters. If the light emitters are, for example, LEDs, which are located in the plane of the matrix, between every two adjacent light emitters may be located one sensor.

These and other aspects of the invention will become apparent and obvious from the following description of the variant(s) of implementation. These options are implemented will be described as an example by the accompanying drawings, in which:

1 shows a schematic drawing of a lighting device according to the present invention.

Figure 2 shows the formation of the overall light output of the lighting device of the contributions of various light emitters and the formation of the vector signal measurements with different sensitivity curves.

Figure 3 shows an example of decomposition of the spectrum of the light emitter on the basis functions.

Nafig presents linear equations, establishes a link between the measurement signals and the coefficients of decomposition during part of the calibration procedure.

Figure 5 presents the calculation of the connection matrix C based on the calibration in figure 5.

Figure 6 presents the calculation of the color point of the light emitter based on the coefficients of expansion of its range.

The same reference position in the drawings refer to identical or similar components.

Figure 1 schematically shows one variant of implementation of the lighting device 1 according to the present invention. This device contains four LED (or string of LEDs) L1, L2, L3 and L4 with different colors, for example green, red, blue and yellow, which are located on the substrate 12 and is integrated in the optical glass 11. On the surface of the substrate 12 has four sensor D1, D2, D3 and D4, connecting with four LED, for measuring the light output of the LEDs L1-L4. In General, the lighting device may consist of k sensors and n light emitters primary colors, that is, this drawing shows a specific case for k=4 and n=4.

Figure 2 on the lower chart shows the spectral sensitivity of σ (or, equivalently, the sensor signal when monochromatic light with wavelength λ with a given intensity in arbitrary units for sensors D1 ... D4. You can see that the curves of sensitivity oscillate the quasiperiodic and go through all the appropriate spectral range, that is, the wavelengths λ smaller than 400 to greater than 800 nm. Such sensitivity curves can, for example, be generated by the photodiodes 20 with a single layer of a dielectric filter having one layer 21 of SiO2on the upper surface of a thickness of from 1 μm to 2.5 μm. Because of its simplicity, such sensors with a single layer of dielectric filters (SDF) can easily be integrated into the base 12.

Figure 1 also shows that the signals (e.g., photocurrent) sensors D1, D2, D3 and D4 are amplified by the amplifiers 13 and next, go to the "assessment unit" 15, which is part of control unit 14. The control unit 14 also includes a power control bit 16 and the driver 17 LED. Unit 16 adjusts the color compares, for example, the color point defined by the block 15 of the assessment on the basis of the measured signal (S1, S2, S3, S4)measuredwith the target color point (X, Y, Z)targetprovided external input 18. On the basis of the result of the comparison unit 16 adjusts the color adjusted sends signals of excitation in the drivers 17 LED, which is connected to the LEDs L1, L2, L3 and L4, and which set the average illumination of the LEDs by adjusting the amplitude (middle) currents to them.

Figure 2 shows the spectral relationships underlying the operation of the lighting device is isopycnal type. In the upper part of figure 2 shows the individual spectra of p1p2, ... pnlight emitters L1, L2, ... Ln. Through the superposition of these individual spectra form the total range of ptotshown in the middle drawing. In the lower part of the drawing shows the already mentioned sensitivity curves σ1, ... σkthat correspond to the sensors D1,..., Dk. The total range of ptotmeasured by these sensitivity curves to obtain the result of the measurement values of S1, ... Skfrom which you can make a vector of dimensionS.

Further objective of the present invention is to effectively estimate the characteristic values of the individual spectra of p1p2, ... pn(or more commonly the individual light outputs)based on vector measurementsS, which was obtained from measurements of individual spectra of p1p2, ... pn.

In this decision the individual spectra of pjlight emitters laid out in a linear combination of spectral basis functions Wi.

The above spectral basis functions Wican be the same for all light emitters. In General, for each light emitter may, however, require its own set of spectral basis functions for an exact match with as less acceptable the m number of factors. For example, this is the place for emitters with a small width as the LEDs. This means that for the RGB system with 4 sensors is preferably a total of 16 (for example, bell-shaped spectral basis functions, grouped in four packs of four functions in each, where these four functions are contained in the same group, are preferably located approximately at the position of the wavelength of the LED to match. To simplify the subsequent discussion, it is assumed that the spectral basis functions are the same for all emitters (or the dependence of the basis functions from a given emitter, at least, will not be specified).

Figure 3 shows an illustrative set of four spectral basis functions W1, W2, W3and W4together with a separate range of pjone light emitter. In this example, the basic functions are bell-shaped and normalized. In addition, the number four is identical to the number of sensors in the lighting device. Next, consider the range of pjcan be described by four coefficients or weights (α1α2α3α4), which can be determined by minimizing the following analytical expressions:

For the NGOs, the shape of the emission spectrum of pjrestore by weighting coefficients αkin the sense of least squares. The width of the peak and the peak position of the spectral basis functions are chosen so that they result led to a suitable prediction of the spectra of the LED. Obviously, you can use more than four spectral basis functions for more accurate predictions of the spectra of radiation of the LEDs. The main idea of this approach is the use of spectral basis functions Wkas a sort of virtual light emitters.

In the future, we will apply the matrix connection", which describe for each light emitter is a linear relation between the vectorαT=(α1α2α3α4) scales and vectorSsignal measurement. For a particular light emitter (for example, LED L1) associated connection matrix C can be determined by the following calibration procedure:

Stage 1: the lighting Device is placed into (closed) dark (dark) camera. LED L1 and include the spectrometer is placed outside the device for measurement of the emission spectrum of the LED. Based on these data, calculate values of (α11α12α13α14) using equation (1). In addition, the signal measurement (S11, S12, S , S14written by embedded sensors D1 ... D4 lighting. Accordingly, the vectorsSandαequationS=C·αknown. To determine the matrix C this experiment should be repeated three times under different conditions:

Step 2-4: Identical to stage 1, but with others (e.g., larger) current, and temperature to stimulate the spectral shifts of the LED L1. As shown in figure 4, steps 1-4 are four independent matrix equations in which the only unknown is C. Hence, C can be calculated by the treatment (figure 5). After calculation of the matrix C expansion coefficients (α1α2α3α4the actual spectrum can be easily calculated by simple matrix multiplication of the vectorSobtained by measuring separately managed LED L1, the inverse matrix C, i.e. by the formulaα=C-1·S.

Step 5: the next step can be calculated color point (X, Y, Z) diode LED L1 by means of the equations presented on Fig.6, on the basis of the estimated coefficients (α1α2α3α4), the corresponding basis functions W1, W2, W3, W4and functions color Explorer Standard in 1931, the CIE (CIE 1931 Standard Observer)x(λ)y(λ) andz(λ) (or any other function, to whom that define the desired color space). The coefficients γxthat γykand γzkin Fig.7 are components of the (3×4) matrix G, which can be calculated in advance through the corresponding overlap integrals and stored in the controller of the lighting device.

Steps 1 through 5 should be repeated with all the other primary colors (i.e. LEDs or strings of LEDs) to obtain the corresponding matrices C', C", etc. the Steps 1 to 4 must be performed once for each device, lighting, perhaps only once for each number generation (if the sensors are reproduced so that the coefficients of the matrix C does not vary from device to device). Stage 5 will be performed while adjusting the color point.

Thus, the described approach provides a solution for collecting spectral information about the basic colors (chains of LEDs) using light-sensitive sensors with heterogeneous broadband sensitivity. The peak radiation of a color is described in terms of the spectral basis functions using the method of matrices. This matrix converts the communication signals of the sensor in the weight ratios of spectral basis functions. Values tricolor (points) are computed directly. Accordingly, this method provides the ability to control the LEDs through various currents or con is imprezy currents (for example, ripple) to adjust the target color point.

The principles of the present invention can be applied to colored lamps with a few basic colors, preferably based on LED diodes or LEDs with phosphor conversion.

Finally, States that in this application the term "comprising" does not exclude other elements or steps, that the singular does not exclude the many, and that a single processor or other unit may fulfill the functions of several means. The invention inherent in each new distinctive feature and each combination of characteristics. In addition, the reference position in the claims should not be construed as limiting their scope.

1. The device (1) lighting, containing a) at least one light emitter (L1, L2, L3, L4, Ln), (b) at least two sensors (D1, D2, D3, D4, Dk) with different spectral sensitivity to generate signals measurement (Si, Sik), which correspond to the individual light output of the above-mentioned light emitter, (C) block (15) to estimate on the basis of these signals (Si, Siksensors of at least one characteristic values (X, Y, Z) of the individual light output of the light emitter, and mentioned characteristic value based on the coefficients (αiαik ) decomposition of the spectrum (p1p2, ... pnpj) mentioned at least one light emitter in a linear combination of a given set of basis functions (W1, W2, W3, W4), these coefficients (αiαik) is not identical to the signal measurement (Si, Sik).

2. The device (1) lighting according to claim 1, which contains a number of such light emitters (L1, L2, L3, L4, Ln), which can be measured separately, and the characteristic values of these light emitters based on the expansion coefficients of the spectrum (p1p2, ... pnpneach light emitter (L1, L2, L3, L4, Ln), given the sets of basis functions (W1, W2, W3, W4).

3. The device (1) lighting according to claim 1, which contains at least two such light emitter (L1, L2, L3, L4, Ln), which can be measured separately and for which a set of basis functions (W1, W2, W3, W4) is the same.

4. The device (1) lighting according to claim 1, in which the basic functions (W1, W2, W3, W4) are selected relative to the expected shape of the spectrum, in particular a bell curve, piecewise linear polynomials and/or b-splines.

5. The device (1) lighting according to claim 1, in which the number of basis functions (W1, W2, W3, W4) identically the number of signal measurement (S i, Sik).

6. The device (1) lighting of claim 1, wherein a color point (X, Y, Z) of the light emitter (L1, L2, L3, L4, Ln) is calculated based on the coefficients (αiαik).

7. The device (1) lighting according to claim 1, in which there is a linear relationship between the characteristic value (X, Y, Z) and the coefficients (αiαik), and the above-mentioned ratio is preferably described by the matrix (G).

8. The device (1) lighting according to claim 1, in which there is a linear relationship between the signal measurement (Si, Sik) and the coefficients (αiαik), and the above-mentioned ratio is preferably described by the matrix (C).

9. The device (1) lighting according to claim 1, in which there is a linear relationship between the characteristic value (X, Y, Z) and the signal measurement (Si, Sik).

10. The device (1) lighting of claim 8 or 9, in which the coefficients (Cij, Yx, Yyk, Yzklinear relationships are defined in the calibration procedure, containing isolated to just one light emitter (L1, L2, L3, L4, Ln) at a time.

11. The device (1) lighting of claim 10, in which is mentioned only one light emitter (L1, L2, L3, L4, Ln) is measured under various operating conditions during the calibration procedure.

12. The device (1) lighting of claim 1, wherein the sensors (D1, D2, D3, D4, Dk) contain photodiodes (20), covered loamy (21) of the insulator of different material and/or different thickness.

13. The device (1) lighting according to claim 1, which contains a controller (14), which is made with the possibility of individual control mentioned at least one light emitter (L1, L2, L3, L4, Ln) based on the estimated characteristic values.

14. The control method for the device (1) lighting with at least one light emitter (L1, L2, L3, L4, Ln)containing phases in which (a) generate signals measurement (Si, Sikthrough at least two sensors (D1, D2, D3, D4, Dk) with different spectral sensitivity, which correspond to the individual light output of the above-mentioned light emitter, (b) evaluate at least one characteristic value (X, Y, Z) of the individual light output of the light emitter on the basis of these signals, measurements, and mentioned characteristic value based on the expansion coefficients of the spectrum (p1, R2, ... pnpn) mentioned light emitter in a linear combination of a given set of basis functions (W1, W2, W3, W4), these coefficients (αiαik) is not identical to the signal measurement (Si, Sik).

15. The method according to 14, in which the device (1) lighting contains many such light emitters (L1, L2, L3, L4, Ln), which can be measured separately, and the nature of the statistical values of these light emitters based on the expansion coefficients of the spectrum (p 1p2, ... pnpneach light emitter (L1, L2, L3, L4, Ln), given the sets of basis functions (W1, W2, W3, W4).

16. The method according to 14, in which the device (1) lighting shall contain at least two such light emitter (L1, L2, L3, L4, Ln), which can be measured separately and for which a set of basis functions (W1, W2, W3, W4) is the same.

17. The method according to 14, in which the basic functions (W1, W2, W3, W4) are selected relative to the expected shape of the spectrum, in particular a bell curve, piecewise linear polynomials and/or b-splines.

18. The method according to 14, in which the number of basis functions (W1, W2, W3, W4) identical to the number of signal measurement (Si, Sik).

19. The method according to 14, in which a color point (X, Y, Z) of the light emitter (L1, L2, L3, L4, Ln) is calculated on the basis of coefficients (αiαik).

20. The method according to 14, in which there is a linear relationship between the characteristic value (X, Y, Z) and the coefficients (αiαik), and the above-mentioned ratio is preferably described by the matrix (G).

21. The method according to 14, in which there is a linear relationship between the signal measurement (Si, Sik) and the coefficients (αiαik), and mentioned the preference relation is sustained fashion described by the matrix (C).

22. The method according to 14, in which there is a linear relationship between the characteristic value (X, Y, Z) and the signal measurement (Si, Sik).

23. The method according to claim 20 or 21, in which the coefficients (Cij, Yx, Yyk, Yzklinear relationships are defined in the calibration procedure, containing isolated to just one light emitter (L1, L2, L3, L4, Ln) at a time.

24. The method according to item 23, which is mentioned only one light emitter (L1, L2, L3, L4, Ln) measured at different modes of operation during the calibration procedure.

25. The method according to 14, in which the lighting device contains a controller (14), which is made with the possibility of individual control mentioned at least one light emitter (L1, L2, L3, L4, Ln) based on the estimated characteristic values.



 

Same patents:

FIELD: physics.

SUBSTANCE: circuit (1) with light-emitting diodes is provided with first subcircuits, having first light-emitting diodes (11) and second subcircuits having second light-emitting diodes (13) and switches (14), in conducting states, for switching on the second light-emitting diodes (13) and switching off the first light-emitting diodes (11), and, in non-conducting states, for switching off the second light-emitting diodes (13) and switching on the first light-emitting diodes (11). Also, the first and second subcircuits have different signal characteristics, such as different minimum threshold voltage values, so as to be realised by different types of light-emitting diodes (11, 13) or using a different total number of serial light-emitting diodes (11, 13) or by adding elements with threshold voltage to the first subcircuits. The light-emitting diodes (11, 13) have different colours and can be used backlight.

EFFECT: simplification.

16 cl, 4 dwg

FIELD: physics.

SUBSTANCE: invention relates to a device for powering luminous elements, having an energy supply unit (12), a first luminous element (30), having a first colour, preferably white, a second and a third luminous element (34, 38), having a second and a third colour, preferably for adjusting the colour of the first luminous element, and a controlled switch (42), connected in series to the said third luminous element (38). Said serial connection from the said third luminous element (38) and said switch is connected in parallel to the said second luminous element (34). The energy supply device is characterised by that the said energy supply unit (12) has a third and a second output (20, 22). The said first luminous element (30) is connected to the said first lead (20) and the said second and third luminous elements (34, 38) are connected to the said second led (22), the said energy supply unit (12) is configured to provide controlled, preferably independently controlled, output signals on the said first and second leads (20, 22), and the said second and third luminous elements (34, 38) and the said energy supply unit (12) are configured in such a way that, the said third luminous element (38) emits light when the switch (42) is closed. The invention also relates to a method of powering the luminous elements.

EFFECT: fewer switches.

20 cl, 4 dwg

FIELD: physics.

SUBSTANCE: proposed illuminator 10 built around LEds comprises assemblage of LED different-colour light sources 14 to produced mixed-colour light and LED source control device to control said sources in compliance with preset values. Note here that first control data are generated by, at least, one colour transducer 22. Illuminator differs from known designs in that its incorporates device 30, 32 designed to determine the temperature of each LED light source and device 26 to compensate for preset values in compliance with second control data including LED light source temperature.

EFFECT: higher stability of operation.

20 cl, 2 dwg, 1 tbl

FIELD: physics.

SUBSTANCE: invention relates to a light-emitting device (1) having an exciter (10) and a flat light-emitting element (20), where the exciter (10) is connected to a source (2) and a the light-emitting element (20), and where the light-emitting element (20), which has internal capacitance (21), is connected to the said exciter (10) so that the internal capacitance (21) serves as the passive output filter of the exciter (10).

EFFECT: design of a light-emitting device with smaller thickness.

10 cl, 9 dwg

FIELD: physics.

SUBSTANCE: fluorescent tube fitting device has a light-emitting diode element (4) which includes at least one electric starter element (4.1) connected to at least one phase conductor and also connected to at least one neutral wire at least through one conductor (4.2) having at least one light-emitting diode (4.3).

EFFECT: reduced need to replace fluorescent tubes in fittings and reduced electrical power consumption.

3 cl, 2 dwg

FIELD: mechanics, physics.

SUBSTANCE: device to excite electroluminescence consists of input unit connected in series with microprocessor unit, sinusoidal oscillation generator, amplitude-frequency response corrector, step-up transformer and exciting electrodes furnished with plates for the specimen to be placed there between. Note that the said exciting electrodes are optically coupled with the photo receiver connected with the ADC which, in its turn, is connected with the microprocessor unit. The latter is connected to the display unit and amplitude-frequency response corrector, while the sinusoidal oscillation generator is connected via a feedback loop with the microprocessor unit.

EFFECT: simpler design, smaller sizes, brightness correction in wide frequency range.

3 dwg

FIELD: physics.

SUBSTANCE: circuit (1) with light-emitting diodes is provided with first subcircuits, having first light-emitting diodes (11) and second subcircuits having second light-emitting diodes (13) and switches (14), in conducting states, for switching on the second light-emitting diodes (13) and switching off the first light-emitting diodes (11), and, in non-conducting states, for switching off the second light-emitting diodes (13) and switching on the first light-emitting diodes (11). Also, the first and second subcircuits have different signal characteristics, such as different minimum threshold voltage values, so as to be realised by different types of light-emitting diodes (11, 13) or using a different total number of serial light-emitting diodes (11, 13) or by adding elements with threshold voltage to the first subcircuits. The light-emitting diodes (11, 13) have different colours and can be used backlight.

EFFECT: simplification.

16 cl, 4 dwg

FIELD: physics.

SUBSTANCE: invention relates to a device for powering luminous elements, having an energy supply unit (12), a first luminous element (30), having a first colour, preferably white, a second and a third luminous element (34, 38), having a second and a third colour, preferably for adjusting the colour of the first luminous element, and a controlled switch (42), connected in series to the said third luminous element (38). Said serial connection from the said third luminous element (38) and said switch is connected in parallel to the said second luminous element (34). The energy supply device is characterised by that the said energy supply unit (12) has a third and a second output (20, 22). The said first luminous element (30) is connected to the said first lead (20) and the said second and third luminous elements (34, 38) are connected to the said second led (22), the said energy supply unit (12) is configured to provide controlled, preferably independently controlled, output signals on the said first and second leads (20, 22), and the said second and third luminous elements (34, 38) and the said energy supply unit (12) are configured in such a way that, the said third luminous element (38) emits light when the switch (42) is closed. The invention also relates to a method of powering the luminous elements.

EFFECT: fewer switches.

20 cl, 4 dwg

FIELD: physics.

SUBSTANCE: proposed illuminator 10 built around LEds comprises assemblage of LED different-colour light sources 14 to produced mixed-colour light and LED source control device to control said sources in compliance with preset values. Note here that first control data are generated by, at least, one colour transducer 22. Illuminator differs from known designs in that its incorporates device 30, 32 designed to determine the temperature of each LED light source and device 26 to compensate for preset values in compliance with second control data including LED light source temperature.

EFFECT: higher stability of operation.

20 cl, 2 dwg, 1 tbl

FIELD: physics.

SUBSTANCE: invention relates to a light-emitting device (1) having an exciter (10) and a flat light-emitting element (20), where the exciter (10) is connected to a source (2) and a the light-emitting element (20), and where the light-emitting element (20), which has internal capacitance (21), is connected to the said exciter (10) so that the internal capacitance (21) serves as the passive output filter of the exciter (10).

EFFECT: design of a light-emitting device with smaller thickness.

10 cl, 9 dwg

FIELD: chemistry.

SUBSTANCE: electroluminescent device has a hole injection layer, a hole transport layer, an active luminescent layer based on electroluminescent substance of formula I , a hole blocking layer, an electron transport layer and an electron injection layer.

EFFECT: high luminance of devices emitting in the green spectral region.

1 ex

FIELD: physics.

SUBSTANCE: display device has a substrate; a pixel electrode placed on the substrate; an insulating dividing wall between pixel electrodes which forms divided regions on the pixel electrodes; an inorganic luminescent layer having its lower surface in contact with the pixel electrode and placed in the region separated by the dividing wall; an opposite electrode placed on the inorganic luminescent layer; and a thin-film transistor which in its conducting state applies voltage between the pixel electrode and the opposite electrode and causes the inorganic luminescent layer to emit light. The composite display device is realised using the said device.

EFFECT: control of thin-film transistors using an inorganic electro-luminescent element which emits light at low voltage.

11 cl, 6 dwg

FIELD: physics.

SUBSTANCE: fluorescent tube fitting device has a light-emitting diode element (4) which includes at least one electric starter element (4.1) connected to at least one phase conductor and also connected to at least one neutral wire at least through one conductor (4.2) having at least one light-emitting diode (4.3).

EFFECT: reduced need to replace fluorescent tubes in fittings and reduced electrical power consumption.

3 cl, 2 dwg

FIELD: physics, optics.

SUBSTANCE: invention relates to photoluminophors designed for converting emission of blue light-emitting diodes to the yellow-red region of the spectrum in order to obtain resultant white light, particularly to a cerium doped luminophor based on yttrium aluminium garnet used in two-component light-emitting diode light sources. The invention describes a luminophor for light sources which contain aluminium, yttrium, cerium, lutetium and oxygen in the following ratio: (Y1-xCex)3Al5O12 and 5-60 wt % over 100% (Lu1-yCey)2O3, where x=0.005-0.1; y=0.01-0.1. The invention provides a fine-grained luminophor with luminescent emission band maximum at λ≈590 nm, while lowering temperature and duration of synthesis.

EFFECT: use of such a luminophor in a two-component light source with a blue light-emitting diode enables to obtain resultant "warm" white light with high colour rendering index, increases uniformity of light scattering and reduces energy consumption during synthesis.

1 cl, 1 dwg, 6 ex

FIELD: physics.

SUBSTANCE: proposed power supply includes a power factor corrector (PFC), a temperature sensor, a photosensor for automatic switching on of light and a multiplier for regulating light intensity. A supply voltage sensor enables switching off the power supply when the input voltage of the power circuit overshoots the normal value. The included n circuit breakers, n stabilisers and n human presence sensors enable switch off of light from any of the n light-emitting diodes, protection of the current circuit of the light-emitting diodes when any of the light-emitting diodes fails and automatic switch off of light in the absence of people.

EFFECT: broader functionalities.

3 cl, 4 dwg

FIELD: lighting.

SUBSTANCE: invention refers to electroluminescent system. Electroluminescent system includes electroluminescent device (1) which contains the first junction electrode (2) made from transparent material. For each of big surfaces of this first electrode (2) there provided is one layer (3, 4) of dielectric material having luminescent properties. These luminous layers are transparent and are made from materials capable of emitting the light with various wave lengths. One electrode (5, 6) is provided on big surfaces of luminous layers (3, 4), which are located on opposite side from common electrode (2). System includes power supply device which serves as control device of luminous layers, which contains two voltage sources. Luminous layers are made from materials capable of emitting the light with various wave lengths. Control device is made so that strips of electrodes can be connected to power supply separately. For rear side of electroluminescent device there provided is layer with mirror coating; mirror surface of this layer faces luminous layers of electroluminescent device.

EFFECT: proposed screens are non-sensitive to touch, and deep drawing thereof is allowed.

10 cl, 5 dwg

FIELD: physics.

SUBSTANCE: light-emitting system (1), comprising a radiation source (2), capable of emitting first light with at least a first wavelength spectrum, first fluorescent material (4), capable of absorbing at least partially the first light and emit second light with a second wavelength spectrum, second fluorescent material (8) capable of absorbing at least partially the first light and emit third light with a third wavelength spectrum, in which the first (4) or the second (8) fluorescent material is a polycrystalline ceramic with density higher than 97% of the density of monocrystalline material, and the corresponding other fluorescent material is a powdered luminophor with average particle size 100 nm <d50%<50 mcm.

EFFECT: invention enables to design an illumination system which emits white light with high colour rendering index, high efficiency, clearly defined colour temperature and good illumination quality, with correlated colour temperature, and enables regulation of the correlated colour temperature of the illumination system.

16 cl, 8 dwg

FIELD: physics.

SUBSTANCE: light-emitting diode lamp has an aluminium radiating housing with a power supply unit in its top part, formed by a hollow rotation body with external radial-longitudinal arms which form the outline of the lamp, fitted with internal radial-longitudinal arms with windows between them and a circular area on the butt-end of the external radial-longitudinal arms in its inner part, on which light-emitting diodes are tightly mounted. The design of the radiating housing with windows between the internal radial-longitudinal arms and guides in the top and bottom parts of the radiating housing, provides efficient convectional heat removal from powerful light-emitting diodes separated from each other by inner and outer streams. The light-emitting diode module has a light-emitting diode fitted into an optical lens and tightly joined to a printed circuit board through a flexible sealing element encircling the light-emitting diode, and the light-emitting diode is rigidly joined to a heat-removing copper plate through a hole in the printed circuit board.

EFFECT: stable light output and colour temperature over the entire service life, high light flux is ensured by a set of structural solutions of the radiating housing and compact light-emitting diode modules.

5 cl, 5 dwg

FIELD: physics.

SUBSTANCE: proposed nano radiator comprises 4-6 nm-dia nucleus of noble metal surrounded by two concentric envelopments. Envelopment nearest to nucleus represents an optically neutral organic layer with thickness of about 1 nm. Second 1-3 nm-thick envelopment is made up of J-aggregates of cyanine dyes. During electron excitation of metal nucleus plasmons, the latter actively interact with J-aggregate envelopment to excite cyanine dyes (Frenkel's excitons) and radiate light in visible range. Metal nucleus electrons may be excited by both photons and electrons.

EFFECT: high quantum output of luminescence and controlled spectrum of radiation in visible range.

3 cl, 1 dwg, 1 tbl

FIELD: physics.

SUBSTANCE: described light-emitting diode has an emitting crystal (crystals), a conical holder and a luminophor, where the holder is made from white material with angle of inclination to the wall equal to 60+5-10 degrees and height equal to 2-3 times the cross dimensions of the crystal. The walls of the holder are covered by a layer of a transparent polymer in which luminophor is distributed. The cavity of the holder is completely filled with a transparent polymer with a flat (or almost flat) surface covered by a layer of polymer in which luminophor is distributed. The invention enables design of light-emitting diodes which emit white light with luminous efficacy of up to 120 lm/W.

EFFECT: high luminous efficacy.

5 cl, 1 dwg, 1 tbl

Up!