Pixel Compensation Circuit Unit for AMOLED Leakage Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current AMOLED display devices with voltage compensation circuits face challenges in maintaining voltage levels at nodes due to excessive leakage current, which affects display uniformity and gray scale representation, especially in high-PPI products.
Innovation Solution
The proposed pixel compensation circuit unit includes a reset power supply line, a reset control circuit, and at least two pixel compensation circuits coupled by a bridge circuit, utilizing double-gate TFTs and switch tubes to reduce leakage current and maintain voltage levels, allowing multiple pixel compensation circuits to share a reset power supply line, simplifying the circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If voltage compensation circuits are used in AMOLED display devices, then display uniformity and gray scale representation are improved, but leakage current increases causing voltage level degradation at nodes
Solution Approach 1:
The pixel compensation circuit is divided into multiple independent pixel compensation circuits that can be selectively activated. The bridge circuit segments the reset power supply line distribution, allowing only necessary circuits to receive reset signals, thereby reducing overall leakage current while maintaining display uniformity in activated regions.
Solution Approach 2:
The patent introduces dynamic control through the bridge circuit and reset control circuit, which selectively activate pixel compensation circuits based on actual display requirements. This dynamic activation reduces leakage current by keeping unnecessary circuits in a low-power state while maintaining voltage compensation in active regions.
2Manufacturing precision
If multiple pixel compensation circuits are implemented, then display uniformity is improved, but circuit structure complexity increases
Solution Approach 1:
Multiple pixel compensation circuits are merged into a unified structure sharing a common reset power supply line through the bridge circuit. This merging approach reduces the number of independent reset power supply lines needed, simplifying the overall circuit structure while maintaining multiple compensation circuits for display uniformity.
Solution Approach 2:
The bridge circuit serves multiple functions: it acts as a switching mechanism, a distribution node for the reset power supply line, and a control interface. This multi-functionality reduces the need for separate dedicated components, thereby simplifying the circuit structure while enabling multiple pixel compensation circuits.
3Reliability
If reset power supply lines are distributed to each pixel compensation circuit, then voltage levels are maintained, but the number of power supply lines increases
Solution Approach 1:
Multiple pixel compensation circuits share a common reset power supply line through the bridge circuit structure. This merging of power supply lines reduces the total number of reset power supply lines needed while the bridge circuit ensures proper voltage distribution to each activated pixel compensation circuit, maintaining reliability.
Solution Approach 2:
The bridge circuit acts as an intermediary between the single reset power supply line and multiple pixel compensation circuits. It mediates the power distribution, ensuring that voltage levels are properly maintained at each node while using fewer power supply lines, thus reducing complexity without sacrificing reliability.
Data Source
AI summary
A pixel compensation circuit unit, a pixel circuit, and a display device are provided in the disclosure. The pixel compensation circuit unit may include a reset power supply line, a reset control circuit, a bridge circuit, and at least two pixel compensation circuits. The at least two pixel compensation circuits are coupled to the reset power supply line, respectively; the reset control circuit is coupled to the reset power supply line and the bridge circuit, respectively; and the at least two pixel compensation circuits are coupled by the bridge circuit. A plurality of pixel compensation circuits may share one reset power supply line, thereby reducing the number of reset power supply lines and simplifying the structure of the pixel compensation circuit unit.