Source Driving Circuit Threshold Compensation
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Solution Overview
Problem
Existing display technologies face challenges in maintaining uniformity of pixel driving circuits due to threshold voltage drifts in drive transistors, leading to inconsistencies in current supply to light-emitting elements, which can be addressed by external compensation methods but often require increased space and reduced resolution.
Innovation Solution
A source driving circuit incorporating a voltage isolation circuit, voltage follower circuit, and switch circuits to form a loop with the drive transistor, allowing for external compensation of threshold voltage drifts and improving pixel driving circuit uniformity by ensuring consistent drive currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal compensation method is applied to compensate threshold voltage Vth, then compensation effect is achieved, but space occupied by pixel driving circuit increases and area of display device increases
Solution Approach 1:
The patent moves the compensation circuit from the pixel level (2D plane within pixel) to the source driver level (separate dimension), implementing external compensation. The source driver circuit includes compensation circuits that compensate threshold voltages for multiple pixels simultaneously, eliminating the need for compensation circuits within each pixel and reducing display area.
2Reliability
If internal compensation method is applied to compensate threshold voltage Vth, then compensation effect is achieved, but resolution of display device is reduced
Solution Approach 1:
The patent relocates compensation functionality from the pixel plane to the source driver, enabling threshold voltage compensation without occupying pixel area. This external compensation approach maintains pixel dimensions and allows for higher display resolution while achieving reliable threshold voltage compensation.
3Area of stationary object
If external compensation method is applied to compensate threshold voltage Vth, then display device area is reduced, but circuit complexity increases
Solution Approach 1:
The patent integrates multiple functions into the source driver circuit, combining data writing, threshold voltage compensation, and pixel driving operations. The compensation circuits share signal lines and control logic with the main driving circuitry, reducing overall complexity despite the added compensation functionality.
Solution Approach 2:
The source driver circuit is designed with multi-functional blocks that can perform different operations (data writing, compensation, driving) using shared hardware resources. The compensation circuits use the same signal lines and control mechanisms as the main driving circuit, making the system more versatile while managing complexity.
Data Source
AI summary
Provided are a source driving circuit, a display device and a pixel driving method. The source driving circuit includes a voltage isolation circuit, a voltage follower circuit, a first voltage dividing circuit, a second voltage dividing circuit, a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, a fifth switch circuit, a sixth switch circuit and a current source.