Display Control Circuit for Column-Inversion Drive Leakage
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Solution Overview
Problem
Display devices using column-inversion drive for reducing power consumption face issues with thin-film transistor deterioration, leading to increased current leakage and display quality degradation, such as luminance variance and bright spots.
Innovation Solution
A display device with a gate drive circuit, source drive circuit, and display control circuit that performs column-inversion drive by reversing the source signal polarity every frame period, calculating and applying an average or mode voltage value during the suspension period to reduce potential differences between electrodes, thereby minimizing current leakage and maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If column-inversion drive is used to reverse source signal polarity every frame period, then power consumption is reduced, but thin-film transistor deterioration occurs leading to increased current leakage and display quality degradation
Solution Approach 1:
The patent applies preliminary action by calculating the average voltage value of the source signal during the display period and storing it in advance. During the suspension period, this pre-calculated average voltage is supplied to the source lines, preventing potential differences from developing due to transistor deterioration before they can cause display quality degradation.
2Use of energy by moving object
If column-inversion drive is used, then power consumption is reduced, but potential difference between electrodes increases causing luminance variance and bright spots
Solution Approach 1:
The patent changes the voltage parameter of the source signal during the suspension period by supplying the average voltage value calculated during the display period. This parameter change maintains the potential difference between electrodes at a minimal level, preventing luminance variance and bright spots while preserving the low power consumption benefits of column-inversion drive.
Data Source
AI summary
A display device includes a display control circuit. The display control circuit includes: an arithmetic unit obtaining a video signal, and calculating, in accordance with the video signal, an average voltage value of a source signal in a display period; and a controller and a signal synthesizer supplying, in the display period, a source signal, based on the video signal, from a source drive circuit to a plurality of source lines, and supplying, in a suspension period, a source signal, having the average voltage value, from a source drive circuit to each of the source lines.