Brightness deviation compensation device and compensation method of organic light emitting display device

Abstract

The purpose of the present invention is to compensate for fluctuation of a threshold voltage due to degradation of a driving transistor (TR12) constituting a pixel circuit (PX10) of an organic light emitting display device. The present invention comprises a plurality of pixel circuits (PX10) disposed in an area where a plurality of gate lines for supplying a row selection signal (SCAN) and a plurality of data lines for supplying a picture signal (Vdata) intersect, wherein each pixel circuit (PX10) comprises: an organic EL element (OLED10); a driving transistor (TR12) for controlling a current flowing through the organic EL element (OLED10) corresponding to the picture signal (Vdata); a switching transistor (TR11) whose conduction state is controlled according to the row selection signal (SCAN); a first capacitor (C11) for charging the threshold voltage of the driving transistor; and a second capacitor (C12) for charging the voltage corresponding to the picture signal (Vdata). By the driving transistor applying the current corresponding to the summed voltage of the voltage charged in the first capacitor and the voltage charged in the second capacitor to the organic EL element (OLED10), the organic EL element (OLED10) emits light at a brightness corresponding to the current.

Description

technical field [0001] The present invention relates to an apparatus and method for compensating for a difference in luminance of an organic light emitting display, and more particularly, to compensating for a difference in luminance of an organic light emitting display by using an organic electroluminescent device as a display element for a pixel of the display devices and methods. Background technique [0002] Recently, an organic light emitting display using an organic electroluminescent device (hereinafter referred to as "organic EL device") as a pixel for the display has received much attention. Herein, an organic light emitting display using an organic EL device as a light emitting device is light and thin, and has superior luminance characteristics and viewing angle characteristics compared with other displays, and thus is expected to be a next-generation flat panel display. [0003] An organic EL device is a light-emitting device having a structure in which an organ...

AI Technical Summary

Problems solved by technology

However, the techniques disclosed in Patent Documents 1 and 2 use differences in characteristic values ​​of transistors and / or organic EL devices before and after deterioration to compensate for brightness differences, and there is a considerable time difference in measurement times before and after deterioration, and thus organic light emission The brightness of the display decreases continuously during the measurement

Therefore, as a result, the techniques disclosed in Patent Documents 1 and 2 cannot immediately compensate for the deterioration

[0025] In addition, Patent Document 2 does not consider the deterioration of the drive transistor, which is one of the factors of characteristic degradation due to the use of the display, and thus cannot completely solve the problem of performance degradation due to long-term use of the display.

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