Character LCD Modules backlight problems now

LED backlight technology is like many new technologies have many attractive advantages, but in order to occupy the large-size COG LCD Display LED backlight mainstream, there is need to resolve some technical difficulties. By comparison of Table 1, we have found a disadvantage in power LED, in addition to the high cost, and poor consistency.

1) LED luminous efficiency is low, with the same size compared to CCFL backlight power consumption is high. The output current CCFL more in 5000 ~ 7000lm luminous flux range is higher than the actual screen output luminous flux 300lm, LED backlighting and most are still unable to reach this target. Now, however, a large number of enterprises engaged in global research, LED luminous efficiency quite fast, highlighting the current flux reaches 10000lm type LED backlight has also emerged, I believe that is only a stone's throw away from maturity.

2) high cost, expensive, the same size of the backlight, LED four times the price of a CCFL. For the current price competitive market, so that manufacturers some prohibitive. Only Sony to image quality regardless of cost. Of course, as the technology matures and the scale of production increases, LED backlight costs will gradually decline.

3) with the presence of white Character LCD Display as a backlight consistency problems, which is a disadvantage compared to CCFL.

4) LED in the network design than the linear light source CCFL difficult, consider LED light radiating strong attenuation.

5) RGB LED backlight Over time generated wavelength of color shift with temperature changes, resulting in different colors.