2, which is a block diagram showing a gamma reference voltage generation circuit with DGC technique of another conventional LCD according to the prior art. Conceptually, DGC changes gamma curve adaptively and automatically by modifying gamma voltages of an LCD. 1, there is no way to change gamma voltages after setting the R-String 11.ĭynamic gamma control (DGC) is the first attempt to improve image quality without data manipulation. The gamma reference voltages are then sent to the source ICs block 12. The voltage difference between the high and the low voltage sources is divided by the R-String 11 so that the gamma reference voltages are obtained analogically. The ASIC block 10 receives the input data and outputs the display data to the source ICs block 12. The generation of the gamma reference voltages in the conventional gamma reference voltage generation circuit 1 is an analog process. The R-String 11 is a voltage divider which is composed of serially connected resistors between a high and a low voltage sources (not shown). The ASIC at least includes an LVDS (Low Voltage Differential Signaling) circuit 101 and timing controller 102, which are used for performing the normal function of the ASIC block 10. 1, the gamma reference voltage generation circuit 1 includes an ASIC (Application Specific Integrated Circuit) block 10, a resistor string (R-String) and buffer block 11, and a source ICs block 12. 1, which is a block diagram showing a gamma reference voltage generation circuit of a conventional LCD according to the prior art. Several years ago, there had been very limited attempt to achieve image enhancement without any data modification because gamma voltages of an LCD is unchangeable. To obtain improved image quality of moving pictures, it is necessary to apply image enhancement technology to TFT-LCDs. In recent years, people have more opportunities to enjoy moving picture images. TFT-LCDs are becoming suitable display devices for digital TVs because of their low power consumption, light and slim design, high image quality and even large-size capability. The present invention relates to a dynamic gamma control method for an LCD, and more particularly to a method for image contrast enhancement by controlling gamma curve in TFT-LCD. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. This application is a continuation application of and claims the priority benefit of a prior application Ser.
0 kommentar(er)
