Micro OLED Pixel Circuit With Substrate Bias Compensation
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Solution Overview
Problem
The difference in transistor threshold voltage characteristics between different pixels in OLED displays leads to poor brightness uniformity, affecting display quality.
Innovation Solution
A pixel circuit design incorporating a driving circuit, compensation circuit, and switch circuit to compensate for threshold voltage differences by discharging the substrate of the driving transistor through a compensation path, ensuring uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional driving circuit is used without compensation, then the device complexity is low, but the brightness uniformity deteriorates due to transistor threshold voltage differences
Solution Approach 1:
The patent applies preliminary action by performing threshold voltage compensation before the light-emitting phase. The compensation circuit pre-adjusts the gate voltage of the driving transistor to account for threshold voltage differences, ensuring uniform brightness across pixels before actual operation begins. This is achieved through a compensation phase that occurs prior to the display phase.
Solution Approach 2:
The patent introduces a compensation circuit as an intermediary component between the data signal input and the light-emitting circuit. This compensation circuit includes compensation transistors and capacitors that mediate the threshold voltage differences, allowing the driving transistor to operate uniformly across different pixels despite manufacturing variations.
2Manufacturing precision
If the substrate bias voltage is not compensated, then the circuit operation is simple, but the threshold voltage difference causes poor display quality
Solution Approach 1:
The patent performs substrate bias compensation in advance through a dedicated compensation phase. During this phase, the compensation transistor is activated to discharge or charge the substrate node, pre-adjusting the substrate bias voltage to compensate for threshold voltage differences before the actual display operation begins.
Solution Approach 2:
The patent changes the substrate bias voltage parameter dynamically through the compensation circuit. By adjusting the substrate potential using the compensation transistor and associated capacitors, the circuit compensates for threshold voltage variations, transforming the fixed substrate bias into a可调 parameter that adapts to each pixel's characteristics.
Data Source
AI summary
The application discloses a pixel circuit and a control method thereof, an electronic device, a storage medium and a program product, which is suitable for Micro OLED, which can compensate for the difference in transistor threshold voltage characteristics between different pixels. The pixel circuit includes: a light-emitting circuit, a driving circuit, a compensation circuit and a switching circuit. The light-emitting circuit in the pixel circuit is in a light-emitting state before at least the pixel circuit is controlled to be in a discharge stage, and in the discharge stage, the substrate of the driving transistor can be discharged through the compensation circuit to compensate the substrate bias voltage of the driving transistor.