Display Panel Compensation Control Using Standstill Phase Sensing
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Solution Overview
Problem
Existing display devices cannot accurately sense the characteristic values of pixel circuits when turned off, leading to inaccurate data voltage compensation upon turning on, which affects the quality of the display image.
Innovation Solution
A compensation control method that involves a timing controller detecting a power-off sensing instruction, controlling the display panel to standstill, sensing characteristic values of each row of pixel circuits in a time division manner, and displaying a black picture during black insertion time periods to ensure accurate sensing and compensation of data voltages upon power-on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device turns off completely, then power consumption is reduced, but the characteristic values of pixel circuits cannot be sensed accurately
Solution Approach 1:
The patent applies preliminary action by sensing the characteristic values of pixel circuits before the display device completely turns off. The timing controller performs sensing operations during a standstill phase that occurs before full power-off, allowing accurate measurement of pixel circuit characteristics (such as threshold voltages of driving transistors) while the device is still powered but not actively displaying. This sensed data is stored and used for compensation when the device is next turned on, eliminating the need to sense during complete power-off state.
2Productivity
If the display device turns on again after power-off, then normal display function is restored, but data voltage compensation becomes inaccurate
Solution Approach 1:
The patent performs preliminary sensing of pixel circuit characteristic values before complete power-off, storing these values for later compensation use. When the display device is turned on again, the stored characteristic values are retrieved and used to calculate accurate compensation voltages, ensuring precise data voltage compensation without needing to perform new sensing operations during the power-on state.
Solution Approach 2:
The patent creates a copy of the pixel circuit characteristic values by sensing and storing them in memory during the standstill phase before power-off. This copied data is then used for compensation calculations when the device is restarted, eliminating the need to perform new measurements and ensuring accuracy without interfering with the normal power-on display restoration process.
3Speed
If sensing is performed immediately after power-off instruction, then sensing speed is improved, but residual charge affects sensing accuracy
Solution Approach 1:
The patent performs sensing as a preliminary action during a dedicated standstill phase that is inserted between the power-off instruction and complete power-off. This timing allows the display panel to stop updating (entering a stable state) while still maintaining power, creating optimal conditions for accurate sensing without residual charge interference from active display updates, yet before complete power-down occurs.
Solution Approach 2:
The patent introduces a periodic standstill phase in the power-off sequence where the display panel temporarily stops updating and holds a stable state. During this periodic pause, sensing operations are performed to capture accurate characteristic values. This periodic stabilization interval ensures residual charges settle while maintaining power supply, creating optimal sensing conditions without requiring complete power-off.
4Measurement precision
If black picture is displayed during sensing, then sensing accuracy is improved by stabilizing pixel states, but display continuity is interrupted
Solution Approach 1:
The patent displays a black picture as a preliminary action during the standstill phase before complete power-off, when no actual display content is needed. This black picture stabilization prepares the pixel circuits in a known state, ensuring accurate subsequent sensing of characteristic values. Since this occurs during the transition phase rather than during normal display operation, the interruption to display continuity is minimal and confined to the power-off sequence.
Data Source
AI summary
The present disclosure provides a compensation control method and a display device. The method includes in a standstill phase, controlling the display panel to stand still; after the standstill phase ends, sensing, by the timing controller, characteristic values of each row of the pixel circuits in the display panel in a time division manner by controlling the gate driver and the source driver; setting a black insertion time period between time periods for sensing characteristic values of different rows of pixel circuits, during the black insertion time period, controlling, by the timing controller, the gate driver and the source driver, to display a black picture on the display panel.