OLED Pixel Circuit Sensing Lines for Brightness Uniformity
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Solution Overview
Problem
Organic light-emitting diode (OLED) display panels face brightness non-uniformity issues due to manufacturing process deviations, leading to reduced picture quality and user experience, which existing internal and external compensation techniques only partially address, especially in high-definition displays where complex circuit structures and manufacturing difficulties complicate complete elimination of moire phenomena.
Innovation Solution
A pixel unit with a driving sub-circuit connected to sensing lines for accurate voltage sensing, allowing for improved threshold voltage detection and compensation, enhancing brightness uniformity and display quality through a combination of internal and external compensation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If internal and external compensation techniques are used, then brightness uniformity is improved, but device complexity increases due to additional sensing lines and compensation circuits
Solution Approach 1:
The pixel circuit is divided into functional sub-circuits: a driving sub-circuit for light emission control and a sensing sub-circuit for voltage detection. This segmentation allows independent optimization of driving and sensing functions, enabling compensation without significantly increasing overall complexity
Solution Approach 2:
The sensing lines are designed to serve dual purposes: detecting voltages during normal operation and providing data for compensation algorithms. The first sensing line detects the voltage of the first terminal, while the second sensing line detects the voltage of the control terminal, enabling comprehensive voltage monitoring for brightness uniformity compensation
2Measurement precision
If sensing lines are added for voltage detection, then threshold voltage detection accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
The sensing lines are directly integrated into the pixel circuit structure, with the first sensing line connected to the first terminal and the second sensing line connected to the control terminal. This self-service integration reduces the need for external connection precision while maintaining high detection accuracy through direct voltage sampling
3Manufacturing precision
If compensation circuits are integrated into pixel units, then display quality is improved, but ease of manufacture decreases due to complex fabrication processes
Solution Approach 1:
The compensation circuit is merged with the driving circuit within the same pixel unit, sharing common elements such as the light-emitting element and power supply connections. This merging allows compensation functionality to be added without requiring separate manufacturing processes, maintaining ease of manufacture while improving display quality
Data Source
AI summary
A pixel unit includes a pixel circuit, a light-emitting element, a first sensing line and a second sensing line. The pixel circuit is electrically connected to the light-emitting element, and the pixel circuit includes a driving sub-circuit. The driving sub-circuit has a control terminal, a first terminal and a second terminal. The first terminal of the driving sub-circuit is configured to be electrically connected to a first power supply terminal, and is electrically connected to the first sensing line. The second terminal of the driving sub-circuit is electrically connected to the light-emitting element. The control terminal of the driving sub-circuit is electrically connected to the second sensing line. The first sensing line is configured to sense a voltage of the first terminal of the driving sub-circuit. The second sensing line is configured to sense a voltage of the control terminal of the driving sub-circuit.