How much brightness of TFT LCD is suitable for outdoor LCD environment?
Date:2019-03-05
We often see LCD products used in outdoor equipment, such as billboards, bank ATMs, station kiosks, etc. if we use TFT LCD, TFT LCD will choose the brightness of LCD screen.
Brightness refers to the physical quantity of light (reflection) intensity on the surface of illuminant (reflector). The human eye observes the light source from one direction. 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 unit brightness of the light source, that is, the luminous intensity per unit projected area. The unit of brightness is candela per square meter (CD / m2). Brightness is a person's perception of the intensity of light.
TFT LCD brightness refers to the brightness of the picture, the unit is candlelight per square meter (CD / m2), or nits, that is, candlelight per square meter. At present, there are two ways to improve the brightness of the display screen. One is to improve the light passing rate of the LCD panel; The other is to increase the brightness of the background light.
Here is a general description of how to select the appropriate brightness for outdoor equipment LCD screen.
The above three conditions can be seen. When the equipment is used indoors, the LCD brightness is about 300nits, and the working temperature is 0 ~ 50 ℃ ° C. When used outdoors, it can be read when the brightness of LCD screen is about 500nits and the working temperature is - 20 ~ 70 ° C。 Another kind of environment has no shelter at all, the brightness of LCD screen should be greater than or equal to 700nits, and the working temperature should be - 30 ~ 85 ℃ ° C. LCD can be read when used outdoors.
When selecting the TFT LCD screen, it should be noted that a brighter TFT LCD is not necessarily a better TFT LCD, because the display screen is too bright, which often makes people feel uncomfortable. On the one hand, it is easy to cause visual fatigue, and at the same time, it reduces the contrast between pure black and pure white, affecting the performance of color scale and gray scale.
LCD brightness is the main parameter that affects the price of LCD, so when selecting TFT LCD, it is not to select high brightness LCD, but to select the appropriate brightness LCD according to the use environment.
Hangzhou Xuhong Technology Co., Ltd. is a technology-based company of industrial color LCD module, industrial control display products and touch screen control. It is a professional supplier of industrial LCD drive solutions. It is an enterprise unit that carries out display and touch control of terminal equipment through LCD products and display drive solutions. Our long-term stable supply of 3.5 "- 32" industrial LCD screen, TFT LCD screen brand diversification, complete models, can meet different customers under different application environments, medical, vehicle special industry wide temperature, bright, wide angle Industrial LCD screen all stable supply.
