| 摘要 |
PURPOSE:To absorb the fluctuation of halftone display luminance due to the fluctuation of transistor characteristics in a TFT substrate by reading out stored halftone display luminance data and executing interpolating operation between areas to be sampled to find out a necessary control variable. CONSTITUTION:The display luminance of representative points (P11, P12...) In a section obtained when a liquid crystal panel 5 is driven by a fixed driving voltage is measured by a luminance measuring instrument 6 and information indicating the unevenness of the luminance is stored in a frame memory 7. A horizontally/vertically synchronizing signal is impressed from a synchronizing signal detecting circuit 3 to the memory 7 and a reading clock signal is formed and synchronized with a display video signal to read out the uneven luminance information stored in the memory 7. As to points other than the representative points such as P11, P12... interpolating operation is executed by an interpolating operation circuit based on data in the vicinity of these points and the operated result is supplied to a level shift circuit 2 as DC voltage information to display a video with a correct luminance level on a liquid crystal panel.
|
