Backlight life

The liquid crystal of the liquid crystal television itself does not emit light, and it belongs to a backlight type display device. There is a backlight behind the LCD screen, and the LCD TV achieves the reduction of the screen by means of "blocking" and "turning on" the light emitted from the backlight by the finely-arranged fine liquid crystal particles on the screen. It can be found that as long as the LCD monitor is powered on, the backlight is working. Even if the displayed picture is a full black picture, the backlight is working. That is, the backlight of the LCD TV is always illuminated. After the power is turned on, the backlight lights up. If the liquid crystal pixels on the screen are all “on”, the backlight will enter the human eye without any obstruction, and the screen is completely white. When an image is displayed, after the on-off state of each pixel is calculated by AD conversion of the display signal, the signal is directly driven to a specific pixel, and the “on-off” of the light by the liquid crystal pixel is controlled so that an image can be generated on the screen. At that time, the image on the screen is like an advertising light box. The light from the lamp in the light box enters the human eye through the patterned film.

Since the transmittance of the liquid crystal is extremely low, the brightness of the liquid crystal television needs to be perfectly displayed. The brightness of the backlight is very high, so the life of the backlight is the life of the LCD TV. The backlight life of the LCD TV is generally more than 50,000 hours. In other words, if you use LCD TVs for an average of 5 hours per day, then the life span of 50,000 hours is equal to the 27 years you can use the LCD TV.