Pixel Circuit Merging for Narrow Bezel Displays
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Solution Overview
Problem
In display panels, the increasing number of pixel compensation circuits and their larger area occupancy hinder the implementation of narrow bezel designs due to the need for uniform display brightness, which is affected by threshold voltage drift and leakage currents in driving transistors.
Innovation Solution
A pixel circuit with multiple pixel compensation circuit groups, each connected to a light-emitting unit group and light-emitting control signal terminals, where each pixel compensation circuit can drive multiple light-emitting units and control signal terminals, reducing the number of required signal terminals and circuit area by using a method of driving sub-frames with valid and invalid potential stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each pixel unit has an independent pixel compensation circuit to ensure uniform display brightness, then display uniformity is improved, but the area occupied by pixel compensation circuits increases
Solution Approach 1:
The patent merges multiple pixel compensation circuits into a shared compensation circuit that can serve multiple light-emitting units. The compensation circuit is shared among M light-emitting units (where M≥2), reducing the total number of compensation circuits from N (one per pixel) to N/M (one per group), thereby decreasing the occupied area while maintaining compensation functionality across all pixels
Solution Approach 2:
The patent makes the pixel compensation circuit universal by enabling it to compensate for threshold voltage drift in multiple light-emitting units simultaneously. The shared compensation circuit can be selectively activated for different groups of light-emitting units through control signals, allowing one circuit structure to perform the function of multiple independent circuits
2Reliability
If the number of pixel compensation circuits increases to maintain display quality, then display performance is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple compensation circuits into a single shared circuit structure, reducing the total component count and interconnections. This merging approach simplifies the overall circuit architecture while preserving the compensation capability needed for high-performance display
3Measurement precision
If each pixel compensation circuit is connected to individual light-emitting units, then control precision is improved, but the number of signal terminals increases
Solution Approach 1:
The patent makes signal terminals universal by enabling each terminal to control multiple light-emitting units through selective activation. The light-emitting control signal terminals and main light-emitting control signal terminals can be selectively enabled for different groups of light-emitting units, allowing fewer terminals to achieve the control precision that would otherwise require more terminals
Data Source
AI summary
A pixel circuit and a method of driving the same, and a display device. The pixel circuit includes a plurality of pixel compensation circuits, and each pixel compensation circuit can be connected to M light-emitting units located in the same column. Each light-emitting control signal terminal of the M light-emitting control signal terminals included in each light-emitting control signal terminal group may be connected to a pixel compensation circuit group (i.e., K rows of pixels compensation circuits).