Pixel Circuit Phase Separation for High-Rate Compensation
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Solution Overview
Problem
The existing pixel circuits in display panels face issues of nonuniform brightness, limited resolution, and limited refresh rate due to insufficient threshold voltage compensation duration, especially at high refresh rates, where data write and threshold voltage compensation are performed in the same phase, leading to poor compensation effects and grayscale-dependent variations.
Innovation Solution
A pixel circuit design that separates threshold voltage compensation and data write phases, incorporating a drive module, storage module, coupling module, reset modules, discharge module, and data write module, allowing for independent control of threshold compensation duration and data write, ensuring uniform brightness and high refresh rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data write and threshold voltage compensation are performed in the same phase, then the pixel circuit structure is simplified, but the compensation duration becomes insufficient especially at high refresh rates
Solution Approach 1:
The patent divides the original combined phase into two separate phases: a threshold voltage compensation phase that occurs before the data write phase. This segmentation allows the compensation process to be performed independently with sufficient duration, while the data write phase can proceed independently afterward. The segmentation resolves the contradiction by sacrificing structural simplicity to gain adequate compensation time, especially important at high refresh rates.
2Productivity
If threshold voltage compensation is performed with insufficient duration, then the refresh rate can be increased, but the compensation effect becomes poor leading to nonuniform brightness
Solution Approach 1:
The patent implements preliminary threshold voltage compensation before the data write operation. By performing the compensation action in advance during a dedicated phase, the system ensures that the drive transistor's threshold voltage is accurately compensated before data writing begins. This preliminary action allows high refresh rates to be achieved while maintaining reliable compensation effects, as the compensation is completed beforehand rather than being rushed during the same phase as data writing.
3Device complexity
If data write and compensation share the same phase, then the control logic is simplified, but grayscale-dependent compensation variations occur
Solution Approach 1:
The patent segments the operational phases to separate threshold voltage compensation from data writing. By isolating the compensation phase before data writing, the system eliminates grayscale-dependent variations because the compensation occurs independently of the data voltage level. This segmentation maintains control logic manageability while significantly improving compensation uniformity across different grayscale levels.
4Reliability
If compensation duration is extended, then the compensation effect improves, but the refresh rate is limited
Solution Approach 1:
The patent resolves this contradiction through phase segmentation by placing threshold voltage compensation in a dedicated phase before data writing. This allows the compensation duration to be extended independently of the data write timing, enabling sufficient compensation time without limiting the refresh rate. The segmented structure permits the compensation phase to occupy the necessary time while the data write phase can proceed at high speeds, thus achieving both good compensation effect and high refresh rate.
Data Source
AI summary
Provided are a pixel circuit, a method of driving the same, and a display panel. The pixel circuit includes a drive module, a storage module, a coupling module, a first reset module, a second reset module, a discharge module, a data write module, and a light emission control module. The storage module is electrically connected to the control terminal of the drive module and the first terminal of the drive module. The first terminal of the coupling module is electrically connected to the first terminal of the drive module. The first reset module is electrically connected to the second terminal of the coupling module. The second reset module is electrically connected to the control terminal of the drive module. The discharge module is electrically connected to the second terminal of the drive module.