Liquid crystal screen

FIELD: optics.

SUBSTANCE: liquid crystal screen can be used in systems for representation of optical data. At reduction in thermal load onto liquid crystal cell of liquid crystal screen at high levels of illumination, one or both polarizers of liquid crystal cell are doubled by additional polarizers, which have the same direction in plane of polarization and are disposed to have space in relation to first polarizers. There is transparent thermal insulator or cooling agent in space.

EFFECT: reduced thermal load at high levels of illumination.

3 cl, 2 dwg

 

The invention relates to the field of display systems for optical information.

Known LCD screens (also have)that includes a liquid crystal cell (ICA), formed by two transparent plates with a liquid crystal layer and active in addressing the gap between the plates, polarizers mounted on the outer surfaces of the plates, and a backlight unit /Vasica, A.m.vasilyev, Weakily and other Color LCD screen with active matrix MDM elements. Computer Science: Nauch.-technology. Coll. Vol. Information display means. Edited Vinuesa. VIMY, 1991, issue 2-3, 99 S./.

The disadvantage of these devices is that the polarizers absorb a part (50% when non-polarized light) incident external light, heat from this and additionally heated ICA.

Known also devoid of these disadvantages of the LCD screen, polarizers which are installed with clearances in relation to GCA and gaps circulates refrigerant /Application EN 2001107087 AND published 10.03.2003,/.

The disadvantage of this analogue is that if the refrigerant particles or inhomogeneities on the screen is distorted due to the rotation of the plane of polarization of light in scattering them. In addition, moisture from the refrigerant with the same consequences. Use relevant Phil is TRS or system of the closed cycle refrigerant increases the size and weight of the device. The remoteness of the polarizers from ICA may also reduce the sharpness of the image on the screen.

The prototype of the proposed device is also have in which wall GCA made of sapphire, which increases the dissipation of heat through the sides of JCA) approximately 40 times /James B. Armstrong, James M. Henz, Sonia R. Dodd. Accomodation of COTS LKDs in military displays. Part of the SPIE Conference on Cockpit Displays V: Displays for defense Applications, Orlando, Florida, April 1988, SPIE Vol.3363, pp.83-92/.

The drawback of the prototype is the transport of heat in the direction of greatest thermal resistance (minimum cross-section and the maximum distance), which leads to uneven heating ICA, and when intense solar illumination of the screen of heating the liquid crystal layer may lead to his transition into the isotropic state and the termination of the screen. An additional disadvantage of this device is the difficulty of obtaining and polishing of sapphire has a hardness of 9 on the Mohs scale.

The aim of the invention is the reduction of heat load on ICA at high light levels (from the front and/or side lights).

This technical result in the present invention is achieved in that one or both of the polarizer duplicated the same orientation of the plane of polarization of the polarizers set in relation to the first with what the op. The gap is the refrigerant or heat insulator.

Duplicate the polarizer is mounted on one side ICA, if the light intensity on the other hand is small, or both sides, if, for example, high intensity lights, and high intensity of sunlight.

With such design, about 50% of the incident additional polarizer light heats only the additional polarizer and almost no heats ICA, since thermal resistance between them is large. Cooling additional polarizer is due to thermal contact with the environment or with refrigerant.

The presence of two polarizers with one hand GCA provides high definition images at different viewing angles and reduces the requirements for uniformity of heat insulator or to the purity of the refrigerant.

The figures depict variants of the invention with one (external) additional polarizer. Figure 1 is a variant of the refrigerant in the gap, as in figure 2 - in heat-insulating glass as an insulator.

Numbers denote: 1 - body, 2 - sealant, 3 - antireflection (ar) coating, 4 - glass substrate antireflection coating, 5 - additional polarizer, 6 - glue the seam of the polarizer 7 - heat-shielding glass, 8 - optical adhesive, 9 - flow of refrigerant, 10 - transparent resis the top floor of the thin-film heater, 11 is a glass substrate, thin-film heater, 12 - rear polarizer of the LCD screen, 13 - rear (activematic) glass LCD screen, 14 - front glass (color) LCD screen, 15 - front polarizer of the LCD screen.

An example of a specific implementation of the present invention may serve also have the size 211,8×157,7 mm (10.4 inches diagonal) resolution 640×480 full-color picture elements. As an additional front polarizer optical Assembly consisting of glass with one-sided coated with dimensions 220×170×1.1 mm, free from any antireflection coating side of which is bonded isotropic optical adhesive thickness of approximately 0.02 mm polarizer with dimensions 217×167×0,18 mm in the Direction of the plane of polarization of the polarizer with an accuracy of ±5° coincides with the direction of the polarization plane of the front polarizer, also have. On top of the polarizer isotropic optical adhesive thickness of approximately 0.04 mm glued to the glass with one-sided coated with dimensions 220×170×1,1 mm

The air gap between, and also have an optical Assembly of an additional polarizer is 3 mm, the air flow rate in the gap is of a 0.012 m/s flamboyance, also have accounts for 83% of the brightness also have no additional polarizado is a (1270 CD/m 2and 1530 CD/m2respectively). Irradiation also have such a luminous flux from the simulator direct sun exposure-type "sun gun" with an integrated flux density of radiation of 1120 W/m2at an ambient temperature of 23°and the maximum brightness temperature, also have in the center of the light spot is 56±2°instead of 77±2°observed in the same area also have under the same conditions, but without the additional polarizer. Clarity in both cases the same.

1. Liquid crystal display, comprising a liquid crystal cell and the adjacent two sides of the polarizers, wherein one or both of the polarizer duplicated the same orientation of the plane of polarization of the polarizers mounted with a clearance in relation to the first.

2. The screen according to claim 1, characterized in that the gap circulates refrigerant.

3. The screen according to claim 1, characterized in that the gap is transparent insulator.



 

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