Liquid crystal screen

FIELD: aircraft engineering.

SUBSTANCE: liquid crystal screen comprises light sources of day illuminating positioned directly behind the liquid crystal cell with polarizers and generator of light flux, reflector positioned behind the generator of light flux, and unit for night illuminating. The reflector has openings for passing light from the unit for night illuminating. The openings are arranged uniformly over the area of the reflector.

EFFECT: enhanced reliability.

2 cl, 1 dwg

 

The invention relates to the field of display systems for optical information, in particular, to the design of liquid crystal screens (also have), used as an aviation indicators.

Known also have, lighting system, which consists of a block of fluorescent lights, and block night lights, providing high brightness and contrast in sunlight and a good range for dimming at night. For use in conjunction with night vision devices block night lights has a filter to eliminate infrared and nearest to her red part of the spectrum. (U.S. patent№№5,211,463; 5,442,522; 5,886,681; 6,039,451)

The disadvantage of this analogy is the reduction of the maximum brightness of the image, also have in daylight caused by the partial absorption and scattering of radiation of fluorescent lamps illumination light wave conductors and rassevayuschim elements on it.

The closest analogue is described in U.S. patent No. 5,143,433.

In it a tubular light sources fluorescent lights are located directly behind the liquid crystal cell (ICA) with polarizers and a shaper of the light flux, and the block night lights is behind them. To increase the maximum brightness in daytime illumination between light sources, day and night lighting installed reflector with narrow slits under the tubular source of what IKI light. Under these slits mounted lamps night lights, which light falls on ICA through fiber wire formed by the cylinder tube of the lamp.

The disadvantage of the prototype is insufficient for night illumination uniformity brightness also have the eye at low brightness is particularly sensitive, as well as the need for production of complex-shape reflector with criticality to the location of the cracks, which also reduce the rigidity of the structure.

The aim of the invention is to improve the uniformity of night-time illumination and reliability also have.

This technical result in the present invention is achieved in that the light sources are fluorescent lights are right behind GCA with polarizers and a shaper of the light flux, for them is a reflector, the reflector - block night lights, and the reflector has a hole for light to pass from block night lights. The holes in the reflector evenly distributed over its surface and have an area defined allowable losses at the reflection of light bulbs fluorescent illumination (upper limit) and to provide night-time illumination (lower limit).

Fluorescent or led light sources fluorescent backlight occupy an area small compared to the area of the illuminated surface and GCA, and do not hinder the passage of light from behind them block night lights. The area of the penumbra cast by them, are offset by the fact that the transparent housing of the lamps, as in the prototype, function as light wave conductors for light night lights, and located behind the lamps fluorescent backlight reflector has a hole, the characteristic size which provides diffraction scattering of light night lights. Specified diffraction scattering in the present invention is ensured by the fact that the holes in the reflector have a characteristic size in the range fromwhere λ - maximum wavelength of visible light, a L - the distance from the reflector to GCA.

For example, if the hole is round and not complied with the first condition, against the holes of the light spot becomes brighter and rings will not, and if you do not comply with the second condition, the diffraction will not significantly affect the picture.

To exclude optical anomalies, including collective interference phenomena from a variety of holes, resulting in uneven illumination ICA, the proposed device, the holes are distributed on the reflector irregularly.

For use in conjunction with night vision devices in the offer, also have, as analogues, used light source, equipped with a filter to filter at the Alenia infrared and near-infrared components of the wavelength spectrum or selected from a class of sources, not emitting at these wavelengths.

The control circuit blocks daytime and night-time illumination - independent, which allows you to use blocks together (including automatic switching when the brightness adjustment), and separately.

The drawing shows a variant of the invention.

Numbers denote: 1 - block night lights, 2 - block fluorescent backlight, 3 - ICA with polarizers, 4 - pack optical film for forming light flux, 5 - reflector with holes, 6 - lamp fluorescent lighting, 7 - luminous flux in daylight mode, backlight, 8 - reflector lamps night lights, 9 - lamp night light, 10 - IR filter, 11 - optical fiber block 12 - a distributed reflector, 13 - solid reflector, 14 - luminous flux in the night mode, 15 - the case of the backlight unit.

An example of a specific implementation of the present invention may serve also have the size 132,5×99,4 mm (6.5 inches), resolution 640×480 full-color picture elements. As the rear reflector lights daytime operation, also have used a light box, and the bottom wall of which is covered with white lighting enamel with a reflectivity of 90÷94%.

Reflecting wall compensate for the decrease in brightness along the perimeter of also have.

At a distance of 2 mm from the reflector and 18 m is from the illuminated surface ICA are 6 electroluminescent lamps cold cathode with a diameter of 3 mm and a length of 145 mm, the total power consumption of 9 watts. The reflector has 11 randomly placed holes in each square centimeter (not average!). The diameter of the holes is 0.3±0.1 mm, i.e. it is in the range fromsince in this example λ=0.6 μm, a L=18 mm

As rear illumination night mode, also have used flat fiber wire, made of organic glass, for example, CO-K thickness of 3 mm Along the two long sides of the light wave conductors at a distance of 2.0 mm are 2 electroluminescent lamp with a diameter of 2.2 mm and a length of 145 mm, the total power consumption of which 2.4 watts.

The maximum brightness of the white image, also have in the day mode is 1280 CD/m2. The minimum brightness of the white image, also have in the day mode is 5 CD/m2.

The maximum brightness of the white image, also have night mode without IR filters is 18 CD/m2. The minimum brightness of the white image, also have night mode without IR filters is 0.1 CD/m2.

The maximum brightness of the white image, also have a night mode with IR filters is 6 CD/m2. The minimum brightness of the white image, also have in the day mode is 0.06 CD/m2.

1. LCD screen, enabling the second liquid crystal cell (ICA) with polarizers and a shaper of the light flux, units day and night illumination, electronic control circuit blocks of the backlight, ICA and the image formed with its help, characterized in that the block night lights is located behind the block fluorescent illumination, and between them set the reflector with evenly distributed over its area round holes, which have a characteristic size in the range fromtowhere λ - maximum wavelength of visible light, L is the distance from the reflector to GCA.

2. The screen according to claim 1, characterized in that the number of holes in the reflector provides the desired uniform illumination ICA, and the total area of holes defined allowable losses at the reflection of light bulbs fluorescent lights, and the required level of image brightness in night mode.

3. The screen according to any one of claims 1 and 2, characterized in that the used block night lights, the emission spectrum which does not contain infrared and near the red areas.



 

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