OLED Pixel Circuit Layout for Consistent Signal Reset
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Solution Overview
Problem
The performance of pixel circuits in OLED array substrates needs improvement to enhance display performance.
Innovation Solution
The pixel circuit in the display panel includes an array substrate with multiple pixel circuits, each having a pixel driving semiconductor portion with two fixed potential nodes connected to a reference signal line, and adjacent nodes are connected by a pixel connecting semiconductor portion to facilitate signal transmission and improve signal consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pixel circuits are used in OLED display panels, then the basic driving function is achieved, but the signal transmission consistency and reset effectiveness are insufficient, leading to poor display uniformity
Solution Approach 1:
The pixel circuit is segmented into distinct functional regions: a pixel driving semiconductor portion containing driving transistors and a pixel connecting semiconductor portion containing connecting transistors. This segmentation allows independent optimization of driving and signal transmission functions, improving signal consistency while maintaining manageable circuit complexity through modular design.
Solution Approach 2:
The pixel connecting semiconductor portion acts as an intermediary between the pixel driving semiconductor portion and the light-emitting element. This intermediate structure provides dedicated signal transmission paths and reset mechanisms, ensuring effective signal delivery and complete reset of the light-emitting element, thereby improving display uniformity.
2Ease of manufacture
If the pixel circuit structure is simplified, then the manufacturing process becomes easier, but the signal transmission and reset mechanisms become inadequate
Solution Approach 1:
The pixel circuit is divided into a pixel driving semiconductor portion and a pixel connecting semiconductor portion, each fabricated as a distinct module. This segmentation enables standardized manufacturing processes for each module type, simplifying production while ensuring that the connecting portion provides adequate signal transmission and reset mechanisms.
Solution Approach 2:
The pixel connecting semiconductor portion is designed to perform multiple functions: signal transmission from the driving portion to the light-emitting element, reset of the light-emitting element, and potential compensation functions. This multi-functionality ensures reliable signal transmission without requiring additional dedicated structures, maintaining ease of manufacture.
3Reliability
If conventional reset mechanisms are used, then the basic reset function is provided, but the independent reset of gate and anode potentials cannot be achieved, affecting display performance
Solution Approach 1:
The reset mechanism is segmented into independent control paths within the pixel connecting semiconductor portion, allowing separate reset of the gate potential and anode potential of the light-emitting element. This segmentation enables precise control of each potential without interfering with the other, improving reset effectiveness while keeping the circuit structure organized and manageable.
Solution Approach 2:
The pixel connecting semiconductor portion provides dynamic control over the reset process, enabling independent adjustment of gate and anode reset timing and magnitude. This dynamic capability allows optimization of reset effectiveness for different operating conditions without requiring a fundamentally complex circuit structure.
Data Source
AI summary
A display panel and a display device are provided, and the display panel includes an array substrate. The array substrate includes a plurality of pixel circuits, a plurality of reference signal lines and a plurality of pixel connecting semiconductor portions. The plurality of pixel circuits is arranged in an array in a row direction and a column direction, each pixel circuit includes a pixel driving semiconductor portion which includes two fixed potential nodes, and the row direction intersects the column direction. The fixed potential nodes are electrically connected to one of the plurality of reference signal lines. Two fixed potential nodes adjacent in a first direction are electrically connected by one of the plurality of the pixel connecting semiconductor portions, and the first direction is parallel to a plane where the array substrate is located.