基于液晶显示器的白场仪设计及其实现

Implementation and Design of White Field Apparatus Based on LCD

研制了一种可用于现场标定色彩测量仪器的白场仪。该白场仪系统基于液晶显示器,以FPGA结合Flash的方式实现,通过对白场校准信息的记录和复现,可以输出标准白场图像。针对白场仪的硬件系统和软件系统,分别设计实现了FPGA控制板、液晶显示器的SVGA信号驱动和并行NOR Flash ROM控制器驱动。经测试,该白场仪系统运行稳定可靠,经计量部门校准后可以生成色温可调整的标准白场,输出亮度误差在24h内小于0.50%。

A white field apparatus was developed,with which the standardization of instruments for color measurement could be finished.The apparatus system was based on LCD and was realized with FPGA.By recording and reproducing the calibration information,the white field apparatus could provide white field with standard color temperature.The FPGA controller board,the SVGA signal driver for LCD and NOR Flash ROM driver were designed and realized for the hardware and software system.As tested,the white field apparatus could provide standard white fields with adjustable color temperature after calibration by metrology institutes and operated steadily and reliably with the luminance error of 0.50% within 24 h.