A liquid crystal display led backlight system with night vision compatibility

Abstract

The invention discloses a liquid crystal display LED (light-emitting diode) backlight system with a night vision compatible function. A light source array comprises RGB (red green blue) LEDs and special light sources, the special light sources emit sensitive light components of a night-vision device, and a circuit respectively provides current for various LEDs to control the strength of emitted light. The liquid crystal display LED backlight system has the advantages of simple structure and production process, high light use ratio, chrominance adjustment flexibility, good compatible effect, low cost, less effect on color gamut and capability of ensuring clear seeing of information on a display screen with naked eyes and through the night-vision device.

Description

technical field [0001] The invention relates to liquid crystal display technology, in particular to an LED light source backlight system compatible with night vision. Background technique [0002] With the continuous development of liquid crystal display technology, liquid crystal display technology has now become the mainstream technology of flat panel display. LCD screens used in special fields in the field not only need to meet the advantages of low power consumption, high brightness, high reliability, and direct viewing under strong light, but also need to be compatible with night vision imaging systems. The essence of night vision compatible technology is that the equipment will not emit light and energy that interfere with night vision devices at night. Night vision compatible technology is an important guarantee for the safe realization of night vision. The cockpit will inevitably be equipped with display screens, and operators need to constantly observe the informat...

AI Technical Summary

Problems solved by technology

[0003] Although in the prior art, by reducing the luminous power of the backlight source, the visible light and infrared light emitted by the backlight source can also be reduced, and the influence of the display screen on the night vision device can be reduced. Display pictures, so the maximum luminous power of the display backlight is usually made very large, but the range of optical power adjustment is limited. Even if the optical power is adjusted to the minimum, the red light and infrared light emitted by the display backlight cannot meet the nighttime requirements. Depending on the requirements of compatibility, in the case of the minimum light power of the backlight, even the visible light is too weak, and the naked eye cannot see the display clearly, and the infrared light is too strong, and the display cannot be seen clearly through the night vision device, so How to improve the night vision compatibility function of the display is an urgent problem to be solved

[0004] In the Chinese patent application number 2015101000427, titled "A LCD LED backlight module with night vision compatibility", the LED white light and the LED colored light are respectively arranged on two printed circuit boards, and placed separately On the side of the light guide plate on the upper and lower layers, to reduce the excitation of the fluorescent powder in the LED white light by the colored light (especially blue light) emitted by the colored LED light strip, greatly reducing the infrared radiation in the night vision compatible mode, ensuring The product meets the requirements of night vision compatibility, but this technology has the following problems: the arrangement of LED lights is complicated, heat dissipation is difficult, which limits the maximum power of LEDs, and the brightness of the LCD screen cannot meet the requirements under strong light during the day, so two Light guide plate, the structure of the light guide plate is complex and takes up a lot of space, the utilization rate of the light emitted by the LED is low, and it is difficult to completely eliminate the problem that the blue light induces the phosphor powder of the white light LED to emit infrared light; The instrument cannot see the information displayed on the display at the same time

[0005] The application number is 2014100553103, and the Chinese patent titled "Night Vision Compatible Infrared Touch Screen Using Induced Transmission Filter" uses an expensive filter with a complicated preparation process, resulting in high cost and inflexible chromaticity adjustment. ; The filter is easily damaged, resulting in the problem of light leakage on the LCD screen, and the display screen cannot be seen clearly with the naked eye after the filter is installed, let alone the color gamut of the display screen cannot be guaranteed

[0006] The existing technology has the following problems: complex structure, high cost, cumbersome operation process, strong interference to night vision devices, low light utilization rate, difficult heat dissipation, and naked eyes or low-light night vision devices cannot see clearly at the same time in night vision compatible mode Information on the display

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