Luminance Compensation System of Display Device and Its Luminance Compensation Method

摘要

A luminance compensation system of a display device according to the present invention includes a display panel including a plurality of pixels, each pixel having a driving TFT generating a driving current according to a gate-source voltage and an OLED emitting light according to the driving current; a luminance measuring instrument configured to obtain a plurality of measured values for each of the plurality of locations by measuring luminance at the plurality of locations in a state in which modeling voltage patterns are applied to a plurality of locations of the display panel; a first modeling unit for modeling the plurality of measurement values and deriving a first luminance characteristic approximation equation based on a compensation parameter for all gray levels for each of the plurality of positions; and obtaining the luminance error between the luminance value according to the first luminance characteristic approximation equation and the measured value from the low gradation sampling voltages belonging to the low gradation section, and obtaining the offset correction parameter by multiplying the luminance error by the low gradation correction gain, and a second modeling unit for deriving a second luminance characteristic approximation equation in which a low grayscale offset is corrected by applying the offset correction parameter to the first luminance characteristic approximation equation.