Pixel Circuit Sharing Unit for OLED Display Uniformity
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Solution Overview
Problem
The non-uniform display in organic light-emitting display panels due to the drift of the threshold voltage of the driving transistor poses a challenge, especially as the demand for higher resolution and reduced pixel area increases, making existing compensation circuits complex and difficult to implement effectively.
Innovation Solution
A pixel circuit design that includes a sharing unit and multiple light-emitting control units, where the sharing unit is connected to power, data, and scan lines to receive necessary signals, and each light-emitting control unit is connected to a light-emitting element, allowing multiple elements to share a single pixel circuit, thereby simplifying the circuit structure and making it compatible with existing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complicated compensation circuit is designed for each light-emitting transistor to solve threshold voltage drift, then the display uniformity is improved, but the device complexity and pixel area increase
Solution Approach 1:
The patent merges multiple light-emitting elements (N elements) to share a single pixel circuit, including the compensation circuit. Instead of having separate compensation circuits for each light-emitting element, the shared pixel circuit performs compensation for all N elements sequentially, reducing the overall circuit complexity and pixel area while maintaining display uniformity through the compensation function.
Solution Approach 2:
The pixel circuit is designed to perform multiple functions: driving N light-emitting elements, compensating for threshold voltage drift, and controlling sequential light emission. The same circuit structure serves as both the driving circuit and compensation circuit for multiple elements, eliminating the need for separate dedicated compensation circuits for each element.
2Reliability
If a complicated compensation circuit is designed for each light-emitting transistor to solve threshold voltage drift, then the display uniformity is improved, but the pixel area increases
Solution Approach 1:
The patent merges multiple light-emitting elements (N elements) to share a single pixel circuit, including the compensation circuit. Instead of having separate compensation circuits for each light-emitting element, the shared pixel circuit performs compensation for all N elements sequentially, reducing the overall circuit complexity and pixel area while maintaining display uniformity through the compensation function.
3Manufacturing precision
If multiple light-emitting elements share a single pixel circuit, then the resolution and pixel density are improved, but the control complexity increases
Solution Approach 1:
The patent employs periodic action by sequentially controlling N light-emitting elements to emit light in different time periods. The pixel circuit sequentially performs compensation, data writing, and light emission for each element in a systematic sequence controlled by scan signals, transforming the complexity of controlling multiple elements into a manageable periodic process that achieves high resolution without excessive control complexity.
Data Source
AI summary
A pixel circuit, a driving method and a display panel are provided by the disclosure. The pixel circuit includes: a sharing unit and N light-emitting control units. An input terminal of each of the light-emitting control units is electrically connected to an output terminal of the sharing unit; an output terminal of each of the light-emitting control units is electrically connected to a light-emitting element, a control terminal of each of the light-emitting control units is electrically connected a control signal line. The sharing unit is configured to drive, through each of the light-emitting control units. The light-emitting element electrically connected to the light-emitting control unit. N is positive integer greater than or equal to 2. The pixel circuit, the driving method and the display panel of the disclosure may solve the problem of the non-uniform display due to the drift of the threshold voltage of the driving transistor.