基于FPGA的LCD测试用信号发生器设计

在检测液晶屏特性和质量时，需要控制液晶屏显示一些标准信号。已有的一些信号产生设备产生的是AV信号、VGA信号或YPbPr信号等模拟制式的信号。模拟制式的信号需要经过图形处理器（GPU）转换成数字LVDS信号，然后输入到液晶屏的扫描控制电路产生相应图像。这个过程不可避免的会使图像信号产生一定程度的失真与损耗，影响图像质量。旨在设计一种新型信号发生器，该发生器产生的数字图像信号转换成数字LVDS信号后，直接输入液晶屏，以避免信号传输过程产生的失真与损耗。

Design of FPGA-based signal generator for LCD testing

LCD screens is asked for displaying some standard signals when the characteristics and qualities are being checked.Since the signals generated by some available facilities are analog signals such as AV signal,VGA signal or YPbPr signal,they are not suitable for testing the digital LCD screens.Those analog signals must be transformed to digital LVDS format by graphic processing unit(GPU),before they are sent into LCD screen scanning circuit to display some standard graphs.Distortion and attenuation are inevitable during this process,which will influence the quality of those standard graphs.Therefore,a new type of signal generator that can directly generate digital standard graph signals was designed.These signals can be sent into LCD screen directly via LVDS port after they are transformed to LVDS signal.The distortion and attenuation of signals can be avoided by this means.