Patent ID: 7027020

Claim:
A designing method of gray level and luminance characteristics of liquid crystal display, comprising the steps of: (A) measuring gray level and luminance data of the liquid crystal display at a predefined voltage by using a liquid crystal display for building a gray level and luminance database of the liquid crystal display; (B) using an equal difference method to calculate characteristics of gray level and luminance at voltages other than the predefined voltage, so as to estimate a relation between gray level and luminance using a different driving circuit chip, wherein when a known gray level voltage design value is V1 n −1, V1 n and V1 n +1, the corresponding luminance is T1 n −1, T1 n and T1 n +1, and the voltage design value to be estimated is V2 n , the following luminance and gray level are obtained: when V1 n >V2 n >V1 n +1, the corresponding luminance is T2 n =T1 n −(T1 n −T1 n +1) * (V1 n −V2 n ) / (V1 n −V1 n +1); and when V1 n −1>V2 n >V1 n , the corresponding gray level is T2 n =T1 n +(T1 n −1−T1 n ) * (V2 n −V1 n ) / (V1 n −1−V1 n ); and (C) adjusting internal resistance of the driving circuit chip of the liquid crystal display to have optimal relation between gray level and luminance, and adjusting black signal high voltage, white signal high voltage, white signal low voltage and black signal low voltage to match the display data and generate outputs of a high voltage and a low voltage of each gray level.