Phosphor converted white LEDs TFT Display Module

(1) two-color phosphor converted white LEDs
The two-color white LED is made of blue LED chip and YAG phosphor. Ships using the blue-chip InGaN chip, the other can also be used AlInGaN Circuit. The blue chip LED with YAG phosphor advantages: simple structure, low cost, the production process is relatively simple, but the method also has several drawbacks, such as the blue LED efficiency is not high enough, resulting in low efficiency of white LED; phosphor itself The energy loss; phosphor and packaging materials aging over time, leading to a color temperature drift, and shortened life expectancy. QVGA lcd display
(2) three-color phosphor converted LED
Trichromatic phosphor LED under the premise of high luminous efficiency effectively improve the color rendering of the LED. Trichromatic white LED of the most commonly used approach is the use of UV LED excitation trichromatic phosphor can be effectively excited by ultraviolet radiation.
With respect to Blu-ray LED + YAG phosphor to obtain white light using a UV-LED + trichromatic phosphors method is easier to obtain uniform white color, it is because the light color of the LED is simply determined by the ratio of phosphor. In addition, this type of white LED with high color rendering, light color and color temperature can be adjusted using the high conversion efficiency of the phosphor can improve LED light effect.
However, UV LED + trichromatic phosphor some defects, such as phosphor conversion ultraviolet radiation less efficient; powder mixing is more difficult; packaging materials under UV irradiation easy to aging, such as short-lived. And higher conversion efficiency red and green phosphors for sulfide system, poor stability of such light-emitting phosphors, the light fades larger. graphic lcd display module