Display Panel Precharge Voltage Control for Burn-In Prevention
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Solution Overview
Problem
Simultaneously driving display panels with different panel characteristics can lead to burn-in issues due to differing precharge voltages and writing polarities, especially in liquid crystal display panels using transverse electric field driving methods.
Innovation Solution
A display device with a control circuit that supplies a common precharge voltage to data lines of multiple display panels, setting the precharge voltage to a value corresponding to the panel characteristics of the non-display state panel, preventing DC voltage application and thus preventing burn-in, even when panels have different driving methods or characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a common precharge voltage corresponding to the display state panel characteristics is used, then the display quality of the display state panel is improved, but the non-display state panel experiences DC voltage application causing burn-in
Solution Approach 1:
The precharge voltage is dynamically adjusted based on the operational state of each display panel. When a panel is in display state, it receives a precharge voltage corresponding to its characteristics; when in non-display state, it receives a precharge voltage of 0V or a voltage that does not cause burn-in. This dynamic adaptation resolves the contradiction by allowing optimal display quality during active operation while preventing burn-in during inactive periods.
Solution Approach 2:
Each display panel receives a customized precharge voltage according to its specific operational state and characteristics, rather than applying a universal precharge voltage to all panels. The control circuit independently controls the precharge voltage for each panel, enabling local optimization where display state panels receive appropriate precharge for quality while non-display state panels receive protective voltage levels.
2Reliability
If different precharge voltages are supplied to each display panel according to panel characteristics, then burn-in is prevented in each panel, but the device complexity increases
Solution Approach 1:
A single control circuit is designed to perform multiple functions: it controls both display state panels and non-display state panels, and dynamically adjusts precharge voltages based on panel operational states. This multi-functional control circuit achieves reliable burn-in prevention across all panels without requiring separate control circuits for each panel type or state.
Solution Approach 2:
The control circuit changes the precharge voltage parameter based on the operational state of each panel. By monitoring whether each panel is in display or non-display state, the control circuit adjusts the precharge voltage parameter accordingly - applying characteristic-matched voltages for display state panels and protective voltages (0V or non-burn-in voltages) for non-display state panels - achieving reliable burn-in prevention through parameter adaptation.
Data Source
AI summary
A display device includes: a plurality of display panels which each have a plurality of pixels provided in correspondence with intersections of a plurality of scanning lines and a plurality of data lines and a driving circuit supplying image data to the data lines; and a control circuit which controls the driving circuits of the plurality of display panels, wherein panel characteristics of the plurality of display panels are different from each other and one of the plurality of display panels is set to a non-display state, wherein the control circuit includes a precharge circuit supplying a common precharge voltage to the data lines of each of the display panels, and wherein the precharge voltage is set so as to have a voltage value corresponding to the panel characteristic of the display panel set to the non-display state.