What is the appropriate brightness for TFT LCD selection in an outdoor LCD screen environment?

We often see products that use LCD screens in outdoor equipment, such as billboards, bank ATM machines, auto show kiosks, etc. If TFT LCD is used, the brightness of the LCD screen will be selected when selecting TFT LCD. Brightness refers to the physical principle of the intensity of light (reflection) on the surface of a luminous body (reflector). The human eye observes the light source from one direction, and the ratio of the light intensity in this direction to the area of ​​the light source 'seen' by the human eye is defined as the brightness of the light source David, that is, the luminous intensity per unit projected area. The unit of brightness is candela/square meter (cd/m2). Brightness is the human perception of the intensity of light. The brightness of TFT LCD refers to the brightness of the screen, and the unit is candela/square meter (cd/m2), that is, candlepower per square meter. There are currently two ways to increase the brightness of the display screen, one is to increase the light transmission rate of the LCD panel; the other is to increase the brightness of the background light. The following is a general description of how to choose the appropriate zero temperature for the LCD screen of outdoor equipment. It can be seen from the three situations in the above figure that the brightness of the LCD screen is about 300nits when the device is used indoors, and the working temperature is 0-50°C. When it is used outdoors, it can be divided into situations with and without obstructions. If there is an obstruction, the brightness of the LCD screen should reach about 500nits to be readable, and the working temperature is -20~70°C. In another case, if there is no obstruction at all, the brightness of the mobile phone LCD screen should be greater than or equal to 700nits, and the operating temperature is -30~80°C , The LCD screen is readable for outdoor use. When selecting TFT LCD screens, it should be noted that the brighter TFT LCD is not necessarily the best TFT LCD, because the display screen is too bright and often makes people feel uncomfortable. The contrast of pure white is reduced, affecting the performance of color scale and gray scale. The brightness of the LCD screen is the main parameter that affects the price of the LCD screen. Therefore, when selecting a TFT LCD, it is not a high-brightness LCD screen, but an LCD screen with an appropriate brightness according to the use environment.

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