Several Types Of Laptop Display Backlight
Jan 04, 2022
The notebook screen is the current TFT-LCD backlight module composed of a liquid crystal panel and a backlight module, which mainly has two light sources, CCFL and LED. Comparing between CCFL and LED, LED is DC and low-voltage; while CCFL is high-voltage (600 volts). Of course, small-area CCFLs also have low-voltage, but generally there are 300-400 volts or more. The light source of the LED can be freely distributed according to the size and application. CCFL is relatively fixed, it needs more diffusion materials to achieve light dispersion, in order to make the brightness uniformity meet the requirements.
From the perspective of extension, (a) the color gamut of LED is wider, and the color saturation can be more than 105%, while CCFL is relatively narrow, most of which can only achieve about 70%; (b) LED's The speed is very fast, which can help LCD to eliminate the phenomenon of smearing; (c) A major defect of LCD is that the "black screen" is not black. If LED dynamic control is used, this problem can be solved well; (d) LED The current can be adjusted; (e) LED is a green environmental protection product, does not contain mercury, is a solid light source, has good shock resistance, and is safe with low voltage. So LED is likely to be widely used in the future.
Regarding the issue of life, although the life of LED is very long, if the user overheats it, it will still cause a decrease in the life. Now we adopt a dynamic method to control, so that the life of the LED can be more than 100,000 hours, according to the drive The difference can meet different needs. CCFL usually only has a life span of 20,000 to 50,000 hours.
In terms of the characteristics of CCFL and LED, the breakdown voltage and working voltage of CCFL are relatively high, while the voltage of LED is very low. So the safety performance of LED is very good.
