Luminance correction system for organic light emitting display devices

摘要

A luminance correction system for organic light emitting display devices is disclosed. In one aspect, an image displayed in a pixel unit of each of the display devices is analyzed and the luminance and color coordinate for main gray-level data is measured. A main-gamma offset value corresponding to the result of image analysis may be generated. A change in voltage of a driving power signal input from an external source of each of the display devices may be sensed. A sub-gamma offset value is generated by applying the change in voltage of the sensed driving power signal. A main-gamma voltage for the main gray level corresponding to the set main-gamma offset value and the set sub-gamma offset value is adjusted and output as an adjusted main-gamma voltage. The adjusted main-gamma voltage may be applied to a data driver of each of the display devices.

主权项

1. A luminance correction system for organic light emitting diode (OLED) displays, the system comprising:
an image analyzing unit configured to analyze an image displayed by a pixel unit of each of the OLED displays and measure the luminance and color coordinate for a main gray level, the image analyzing unit comprising:
a measuring unit configured to measure the chromaticity and luminance of an image;a color coordinate determination unit that determines a color coordinate based on the measured chromaticity; anda luminance comparator configured to evaluate a difference between a predetermined target luminance and the measured luminance based on the measured luminance; a main-gamma offset generating unit configured to:
generate a main-gamma offset value for each color data in the main gray level based on a result of image analysis performed by the image analyzing unit,generate a main luminance gamma offset value for adjusting the luminance corresponding to the difference between the measured luminance and the target luminance for the main gray level, obtained by the luminance comparator, andgenerate a main color-coordinate gamma offset value configured to adjust the chromaticity corresponding to the color coordinate for the main gray level, obtained by the color coordinate determination unit; a driving voltage sensing unit configured to sense a change in voltage of a driving power signal input from an external source of each of the OLED displays; a sub-gamma offset generating unit configured to receive the sensed change in voltage from the driving voltage sensing unit, and to generate a sub-gamma offset value for each color data in the main gray level based on the received sensed change in voltage of the sensed driving power signal; a gamma voltage adjusting unit configured to adjust the main-gamma voltage for the main gray level corresponding to the set main-gamma offset value and the sub-gamma offset value, wherein the gamma voltage adjusting unit is further configured to output the adjusted main-gamma voltage; and a gamma voltage applying unit configured to apply the main-gamma voltage adjusted by the gamma voltage adjusting unit to a data driver of each of the OLED displays.