Display Pixel Discharge via Gamma Voltage Swapping During Recovery
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Solution Overview
Problem
Display panels with high power consumption experience delays in discharging charges from pixel circuit nodes during recovery operations, leading to malfunctions such as black screens, screen flickering, or PMIC shutdown due to residual charges.
Innovation Solution
An electronic device and method that swap a gamma voltage to discharge pixel charges by controlling a discharge voltage through a device driver integrated circuit (DDI) before transitioning the display from an off state to an on state during recovery operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is cut off and resupplied during recovery operation, then display panel can be reset, but charges remain in pixel circuit nodes causing malfunction
Solution Approach 1:
The patent applies preliminary action by discharging the pixel circuit nodes before resupplying power during the recovery operation. The discharge operation is performed in advance to remove residual charges that would otherwise cause malfunction when power is restored, ensuring a clean state before normal operation resumes.
Solution Approach 2:
The patent converts the harmful residual charges into a beneficial discharge process. By intentionally creating a discharge path through the gamma voltage swap mechanism, the harmful trapped charges are safely removed and converted into a controlled current flow that resets the pixel circuits without causing damage.
2Speed
If gamma voltage is swapped to discharge pixels, then charges are discharged quickly from pixel nodes, but additional control complexity is introduced
Solution Approach 1:
The patent applies universality by making the gamma voltage generation unit perform multiple functions. Besides its normal role in generating gamma voltages for grayscale control, it is also utilized to generate discharge voltages by swapping between different voltage lines, eliminating the need for a separate discharge circuit and reducing overall system complexity.
Solution Approach 2:
The patent uses the gamma voltage swap mechanism as an intermediary to achieve discharge. Instead of directly connecting pixel nodes to ground or power rails, the system uses the gamma voltage lines as an intermediate pathway, allowing controlled discharge through voltage swapping while maintaining electrical isolation and protection.
Data Source
AI summary
The disclosure relates to an electronic device and a method for swapping a gamma voltage for discharging of pixels during a repair operation of a display panel. The method includes determining whether a display is in at least one prespecified abnormal state, and performing a display recovery operation, based on determining that the display is in the abnormal state, the display recovery operation including an operation of transitioning the display from an on state to an off state, and an operation of transitioning the display from the off state to the on state, wherein a device driver integrated circuit (IC) (DDI) is controlled to supply a discharge voltage for discharging the voltage of designated nodes included in a plurality of pixels, to a data line of the display before the display transitions from the off state to the on state.