Patent ID: 8643589
Filing Date: 2014-02-04
Classification: G09G

Abstract:
1. A rapid detection method for a decay of a liquid crystal display device having an LED backlight, where said display device comprises a liquid crystal display module and said LED backlight comprises at least one group of LED devices with each group having a plurality of LED devices, and where said display device is provided with at least one optical sensor, a power supplying device for separately actuating the respective LED devices with a variable electric output, a processing device for receiving references values detected by said optical sensor and controlling the electric output of said power supplying device, and a memory device that pre-stores the respective reference values for the respective LED devices which are separately obtained by the optical sensor when the respective LED devices are lighted in an one-by-one manner at at least one given power level, said method comprising the steps of: a) at a predetermined starting time point, allowing the processing device to command the power supplying device to cut off the power supply to all of the LED devices; b) powering the group of LED devices to emit light in a synchronized manner by providing test signal data comprised of a plurality of driving signals, wherein the driving signals are mutually orthogonal to one another and have an output power level corresponding to the at least one given power level stored in the memory device; c) allowing the optical sensor to detect the emitted light from the group of LED devices supplied with the test signal data to obtain a detected value and converting the detected value into an electrical test signal; and d) allowing the processing device to extract respective light emission data for the respective LED devices in the group from the electrical test signal by multiplying the respective driving signals with the detected reference values and compare the respective light emission data for the respective LED devices with the corresponding reference values pre-stored in the memory device.