LTPO Pixel Circuit Compensation for Stable Reset Signal Potential
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Solution Overview
Problem
The instability of the reset power source signal potential in display panels using low-temperature poly-silicon oxide (LTPO) transistors leads to abnormal displays, such as uneven screen splitting, due to repeated charging and discharging of light-emitting components.
Innovation Solution
A pixel circuit with a driving circuit and compensation circuit is introduced, where the compensation circuit controls the reset power source line to provide a stable reset power source signal at any period, ensuring consistent potential through transistors and capacitors, and switches connections based on compensation control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-frequency or variable-frequency driving is used to reduce power consumption, then power consumption is reduced, but the reset power source signal potential becomes unstable leading to abnormal display
Solution Approach 1:
The compensation circuit performs preliminary action by compensating for the potential variation of the reset power source signal before it affects the light-emitting component. The circuit calculates the potential variation based on the light emission driving signal characteristics and adjusts the reset power source signal in advance, ensuring stable potential even during low-frequency or variable-frequency driving operations.
2Productivity
If the light-emitting component is charged and discharged multiple times within one frame, then power consumption is reduced, but display uniformity deteriorates due to reset power source signal instability
Solution Approach 1:
The compensation circuit implements feedback by continuously monitoring the light emission driving signal characteristics and using this information to adjust the reset power source signal. The circuit calculates the potential variation caused by repeated charging and discharging operations and applies compensatory adjustments, ensuring that the reset power source signal maintains stable potential throughout multiple charge-discharge cycles within one frame.
Data Source
AI summary
A pixel circuit and a driving method thereof, a display panel and a display device are provided, which belong to the field of display technologies. The pixel circuit includes a driving circuit and a compensation circuit. The driving circuit can transmit a reset power source signal to a driving node to reset a light-emitting component connected to the driving node; and can transmit a light emission driving signal to the driving node to drive the light-emitting component connected to the driving node to emit light.