| 摘要 |
PURPOSE:To realize cost reduction and high gradation precision by detecting and compensating the optical variation among plural liquid crystal elements roughly by a sensor and compensating the variation of each liquid crystal element by estimated data. CONSTITUTION:The optical variation among the respective liquid crystal elements 1 is detected by a sensor 8 and a compensating device 7 outputs compensating data corresponding to the variation. A memory 9 outputs gradation data and a memory 11 outputs compensating data set previously for compensating the variation among the liquid crystal elements 1. A gradation generator 6 inputs those outputs and the gradation data from the memory 9 is compensated by the compensating data from the compensating device 7 and memory 11, so that the gradation generator 6 generates a gradation voltage on the basis of the compensated gradation data. Thus, the cost reduction and high gradation precision are realized. |
