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    • 5. 发明申请
    • LED BACKLIGHT FOR LCD WITH COLOR UNIFORMITY RECALIBRATION OVER LIFETIME
    • LED背光用于具有彩色均匀性的液晶显示器寿命延长
    • WO2007141732A3
    • 2008-04-24
    • PCT/IB2007052107
    • 2007-06-05
    • KONINKL PHILIPS ELECTRONICS NVPHILIPS LUMILEDS LIGHTING CO
    • LANKHORST MARTIJN H RGROOTES PIETERHENDRIKS ROBERT F M
    • H05B33/08G09G3/34
    • H05B33/0869G09G3/342G09G2320/0233G09G2320/0633G09G2320/0666G09G2320/0693G09G2360/147H05B33/0815H05B33/0827Y10S362/80
    • An LED light source for LCD backlighting is described that recalibrates itself over time so that color and brightness uniformity across the backlight is maintained over the life of the backlight. The backlight contains clusters of red, green, and blue LEDs, each cluster generating a white point. In one embodiment, each color in a cluster has its own controllable driver so that the brightness of each color is a cluster is separately controllable. One or more optical sensors are arranged in the backlight, and the sensor signals are detected by processing circuitry to sense the light output of any LEDs that are energized in a single cluster. The measured white point and flux are compared to a stored target white point value and flux for that cluster. The currents to the RGB LEDs are then automatically adjusted to achieve the target level for each cluster. This process is applied to each cluster in sequence until the recalibration is complete. The recalibration takes place at various times over the lifetime of the backlight to offset the effects of LED degradation over time. Variations of this technique are also described.
    • 描述了用于LCD背光的LED光源,其随着时间的推移重新校准自身,使得在背光源的使用寿命期间保持背光源上的颜色和亮度均匀性。 背光包含红色,绿色和蓝色LED的簇,每个簇产生一个白点。 在一个实施例中,簇中的每个颜色具有其自己的可控驱动器,使得每个颜色的亮度是簇是单独可控的。 一个或多个光学传感器布置在背光源中,并且传感器信号由处理电路检测,以感测在单个群集中被激励的任何LED的光输出。 将测量的白点和通量与存储的目标白点值和该簇的通量进行比较。 然后,自动调整到RGB LED的电流,以实现每个集群的目标级别。 该过程按顺序应用于每个簇,直到重新校准完成。 重新校准在背光源的寿命期间的不同时间进行,以抵消LED劣化随时间的影响。 还描述了该技术的变化。