Display device and display driving method

Abstract

The present invention relates to a display device and a display driving method. The display device of the invention sustains high picture quality and easily corrects the brightness alternation based on temperature. The signal amplitude reference voltage (Vofs) and gamma reference voltage are altered according to temperature. Namely the signal amplitude reference voltage (Vofs) and gamma reference voltage are kept in the initial electric potential relationship and simultaneously controlled in leakage thereby sustaining the illumination display capability of pixel circuit and eliminating the brightness alternation characteristic based on temperature. Thus the alternation amount is homologous to the alternation amount of self-lifting amount caused by temperature alternation of two terminal voltages of organic EL component. As a result, the alteration of rising amount of source voltage (Vs) of driving transistor (Tr2) based on temperature is eliminated according to the alternation of signal amplitude reference voltage (Vofs) and gamma reference voltage thereby correcting the brightness alternation.

Description

technical field [0001] The present invention relates to a display device using an organic electroluminescence element (organic EL element) as a light-emitting element, and a display driving method thereof. Background technique [0002] Patent Document 1: (Japanese) Unexamined Patent Publication No. 2005-265937 [0003] Patent Document 2: (Japanese) Unexamined Patent Publication No. 2003-330419 [0004] Flat Panel Displays are widely used in products such as computer monitors, mobile terminals, and television receivers. Currently, liquid crystal display panels (Display Panel) are mainly used, but it is still pointed out that the viewing angle is narrow and the response speed is slow. On the other hand, organic electroluminescent (electroluminescence: EL) displays formed of self-luminous elements can not only overcome the above-mentioned problems of viewing angle and responsiveness, but also achieve a thin shape and high Brightness and high contrast, so it is expected as a ...

AI Technical Summary

Problems solved by technology

[0014] At this time, if only considering the brightness, it can be corrected appropriately, but the grayscale component of the display data will be used for correction, and the grayscale component of the image will decrease. Difficulty maintaining high image quality

[0015] As mentioned above, conventionally, it has been disclosed that when it is intended to correct the luminance fluctuation characteristic due to temperature, the cause of its occurrence is not taken fundamental measures, and the pulse duty There is a problem that it is necessary to reduce the value-added components such as image quality and functions in the method of performing correction operations by changing a part of other brightness parameters such as video signals or video signals.

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