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利用光电二极管测量采集液晶显示器不同灰度变化时的响应曲线的电路设计方案。针对液晶显示器不同灰度时对光电采集系统精度的要求,对光电二极管性能、前置级放大电路的稳定性、减小噪声等方面的作了详细分析,提出了具体的设计方案,并进行了实验,采集到的响应曲线真实反映了LCD发出的光随时间变化的过程,为进一步分析运动伪像提供了有效手段。结果表明该设计稳定可靠,满足测量精度的要求。
Using photodiode to measure the response curve of different LCD gray gradient changes circuit design. Aiming at the requirements of the photoelectric acquisition system for the different gray scales of the liquid crystal display, the detailed analysis of the performance of the photodiode, the stability of the preamp amplification circuit and the reduction of noise are made. The specific design scheme is put forward and the Experiments, the collected response curve reflects the actual process of light emitted by the LCD over time, and provides an effective means for further analysis of motion artifacts. The results show that the design is stable and reliable, and meets the requirements of measurement accuracy.