Liquid-crystalline screen

FIELD: engineering of systems for displaying optical information.

SUBSTANCE: liquid-crystalline screen is proposed, which has gaps for coolant between walls of liquid-crystalline cell and polarization changers. For pumping air through gaps, draining ventilator is used, because air during that expands in area of gap and cools down more. To decrease thermal effect on liquid-crystalline cell from external radiation, it is proposed to apply anti-reflective cover to surface of liquid-crystalline cell. Effect of infrared radiation on liquid-crystalline cells from heated polarization changers is weakened by creating a layer with high refraction coefficient, included in composition of anti-reflective cover, made of material with high conductivity.

EFFECT: possible use of liquid-crystalline screen under heavier thermal conditions, for example, in aviation, due to circulation of coolant and due to prevention of contact of liquid-crystalline cells with polarization changers, heating up during operation.

3 cl, 1 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 glass plates - walls ICA with a layer of liquid crystal 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./.

Drainage from ICA heat coming to ICA as a result of absorption by Polaroids and liquid crystal cell, light from the backlight unit and from external sources (e.g. the sun)occurs through the walls of the cell, i.e. through the glass plates and polarizers.

The prototype of the proposed device is also have in which to disperse heat from the also have through the side wall instead of the glass plates in JKA used sapphire, which increases the heat dissipation toward bocoum surfaces approximately 40 times (James C. 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 disadvantage of the prototype method is to limit the pursuit of the heat sink due to the limited thermal conductivity of the polarizers and sapphire. During intense solar illumination of the screen and high ambient temperature heating of the liquid crystal layer may lead to his transition into the isotropic state and the termination of the screen. An additional disadvantage of the prototype method 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 caused by heat from the backlight unit and from external sources of radiation (solar radiation) in environments with high ambient temperatures and high light levels (e.g., composition, also have aviation applications).

This technical result in the present invention is achieved in that between the walls ICA and polarizers are gaps for the refrigerant. When the polarizers absorb about 50% of incident light and heating because of this, not heated ICA directly and not preventing it from cooling. The refrigerant air is used, and for pumping installed exhaust fan to reduce short-term pressure drop that occurs due to the depressurization of the cabin of the aircraft using the also have.

To increase the light transmittance in the working spectral range, also have λ=0,40-0,65 MK is on the surfaces of the walls ICA deposited antireflective coating, in which layers with a high refractive index is used layers with low resistivity (ρ<10-3Ohm·cm). The use of conductive layers increases the reflectivity in the infrared region up to 40% and prevents heat ICA radiation relatively hot Polaroids.

The drawing shows a variant of the invention.

Numbers denote: 1 - liquid crystal cell, 2 - glass plate, 3 - polarizers, 4 - gap for pumping the refrigerant, 5 - ar coating, containing in its composition layer with a high conductivity.

An example of a specific implementation of the present invention may serve also have size 10×20 cm2in which the gap between the glass walls ICA and polarizers is 3 mm, the refrigerant is air, the pumping of air is carried out at a rate of 20 l/min To the surface ICA applied a two-layer antireflective coating composition of ZnO:Al-SiO2. The layer of zinc oxide doped with aluminum, plays the role of a material with a high refractive index (n=2) and, due to its low resistivity (ρ=4×10-4Ohm·cm), has a high (about 40%) reflection in the infrared region.

The tests showed that when the power of the illumination source 40 W and the intensity of the solar flare 884 W/m2 the temperature GCA above the ambient temperature is 7°while without pumping air this value is 17°C.

1. Liquid crystal display, comprising a liquid crystal cell (ICA), polarizers and a backlight module, characterized in that between ICA and polarizers are gaps for the refrigerant, the refrigerant is air pumped through the gaps fan.

2. The LCD screen according to claim 1, characterized in that the surfaces GCA made antireflection coating.

3. The LCD screen according to claim 2, characterized in that the antireflection coating includes a layer with a high conductivity.



 

Same patents:

FIELD: computer engineering, possible use for realization of computing systems, image construction systems, and also optic-electronic modulators.

SUBSTANCE: device contains optic-electronic screen, including glass substrate, a layer of reflectors, two layers of electrodes, a layer of wave ducts, light-conducting layer, two layers of holograms, modulating layer, guiding, protective and bitmap layers, synchronization block, amplifiers of input and output, commutator of optical information, information block, consisting of wave front modulator, voltage modulator and block for controlling modulators.

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Optoelectronic node // 2124748
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3 cl, 13 dwg

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2 dwg

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14 cl, 10 dwg

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4 dwg

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48 cl, 10 dwg

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2 cl, 16 dwg

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EFFECT: improved efficiency of operation.

48 cl, 10 dwg

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EFFECT: improved efficiency of operation.

48 cl, 10 dwg

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