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为了提高夜视兼容的液晶显示器(LCD)显示屏的显示效果,在使用红绿蓝三色LED为背光源的基础上,增加了红外LED,将不同的LED搭配成在不同模式下使用的两套光源。根据10.4in(1in=2.54cm)背光源的亮度和均匀性的要求,将背光源当作朗伯发光体来计算亮度,以便于选择LED的类型,确定LED的数量和排列方式,合理选择光学膜片及设计背光模组的结构。由于红外LED的发光功率可调节,在夜视兼容模式下,不仅可以通过夜视仪看清LCD显示屏上的信息,而且用裸眼也可以轻易看清显示屏上的信息。通过TracePro软件进行仿真并分析,结果发现设计的背光模组同时满足了LCD显示屏的强光下可视和夜视兼容两项要求。
In order to improve the display performance of a night-vision-compatible liquid crystal display (LCD) display, an infrared LED is added based on the red, green and blue LEDs as a backlight, and the different LEDs are used in two Set of light sources. According to 10.4in (1in = 2.54cm) backlight brightness and uniformity requirements, the backlight as Lambertian luminaries to calculate the brightness in order to select the type of LED, LED to determine the number and arrangement, a reasonable choice of optical Diaphragm and the design of the backlight module structure. Due to the adjustable luminous power of the infrared LED, it is not only possible to see the information on the LCD screen through the night vision device, but also to easily see the information on the display screen with the naked eye in the night vision compatible mode. Through the simulation and analysis of TracePro software, the result shows that the designed backlight module meets both requirements of glare-proofing and night-vision compatibility of LCD display at the same time.