Taiwan ITRI R & D LED backlight module color correction system

LED gradually entering the large size panel backlight applications, R, G, B 3 color light mixing LED demands high color saturation and long life and other advantages, suitable for public display, large size LCD TVs and other high-end products, but according to the research pointed out that when the LED backlight is used for more than 1000 hours, will lead to single or partial LED light attenuation problem. The LED backlight module color drift correction system of Taiwan Institute of R & D, sense of failure and light compensation, prolong the service time of 10 thousand hours or more.

The Institute of South Branch of Laser Center said that this set of calibration system is through color calculus number, the wavelength and intensity of the single or partial LED light source is modified to receive a light source light intensity induction using LED sensor, when the LED light attenuation compensation, in order to maintain the original color backlight module performance.

Although LED has advantages of high service life, which can be up to 100 thousand hours of continuous use, high thermal power conversion of LED is relatively high, the higher the temperature, the faster decay situation occurred, in addition to the use of the environmental temperature and package also affect the service life of LED. The Institute pointed out that when LED used for more than 1000 hours, LED may have a serious decay, the naked eye can perceive the change of the light source.

The southern branch of the Institute of Laser Center pointed out that the correction system is when the LED light appears uneven, small part of the light attenuation degree of 40% specifications, LED drive system will be modified, and different degree of compensation in order to maintain the collocation of LED light-emitting backlight module specifications, making comprehensive plate color offset control in color deviation below <0.005.

However, because the human eye for color deviation LED decay to sense, so unless there is a high requirement on the color difference of products, such as large size high order LCD TV, public display, medical panel, or for the general consumer users, attenuation difference is not obvious.

The Institute said that this calibration system has 5 patent applications, is currently working with a large panel of Taiwan factory to negotiate, hope from the patent layout to provide manufacturers new profit point.