Display Device Gate Driver Threshold Voltage Compensation
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Solution Overview
Problem
Existing display devices using organic electroluminescent (EL) elements face variations in luminance due to shifts in threshold voltage of drive transistors, which are not adequately compensated by existing compensation methods, leading to inconsistent display quality.
Innovation Solution
A display device with a gate driver circuit and control circuit that applies a compensation voltage to drive transistors during periods without video signal voltage application, and adjusts the length of the preceding compensation voltage application period immediately before the video signal is applied to stabilize the threshold voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compensation voltage is applied multiple times to ensure threshold voltage compensation, then the compensation effectiveness is improved, but the variation in degree of compensation increases due to varying periods between compensation voltage application and video signal voltage application
Solution Approach 1:
The invention applies compensation voltage multiple times before the video signal voltage is applied to the pixel. By performing preliminary compensation actions in advance, the threshold voltage is stabilized before it affects the display output, ensuring consistent compensation regardless of the timing variations between compensation cycles and video signal application.
2Adaptability or versatility
If the period between compensation voltage application and video signal voltage application varies, then the compensation degree varies, but this causes luminance variation in the display device
Solution Approach 1:
The invention maintains continuous compensation action by applying compensation voltage multiple times in sequence before the video signal voltage. This continuous compensation ensures that the threshold voltage remains stabilized throughout the period leading up to video signal application, eliminating luminance variation caused by timing differences between compensation and display operations.
Data Source
AI summary
A display device is provided that includes a plurality of pixels, each of which includes an electroluminescent (EL) element and a drive transistor that controls a current flowing through the EL element. The display device also includes a gate driver circuit that applies, to each of the plurality of pixels, a compensation voltage for compensating a threshold voltage of the drive transistor, in each of compensation voltage application periods included in a period other than a period in which a video signal voltage is applied. The display device further includes a control circuit that controls the gate driver circuit, wherein the control circuit adjusts a length of, among the compensation voltage application periods, a preceding compensation voltage application period immediately before the video signal voltage is applied.