Mirror-Symmetrical Pixel Circuit Layout for OLED Substrates
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Solution Overview
Problem
Existing pixel circuits in high-resolution display devices, such as OLEDs, face challenges in complexity, signal interference, and difficulty in layout design, which affect the display's performance and efficiency.
Innovation Solution
A display substrate with a pixel circuit design that includes a driving circuit, data writing circuit, storage circuit, control circuits, and a light-emitting control circuit, arranged in a mirror-symmetrical configuration to simplify the structure, reduce complexity, and enhance compatibility with multiplexing designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional pixel circuit designs are used in high-resolution display devices, then the display quality can be maintained, but the circuit complexity increases and layout design becomes difficult
Solution Approach 1:
The pixel circuit is divided into multiple functional modules including driving circuit, data writing circuit, storage circuit, first control circuit, second control circuit, and light-emitting control circuit. Each module performs a specific function, allowing for independent optimization and simplifying the overall design process while maintaining high display quality
Solution Approach 2:
The patent employs mirror-symmetrical arrangement of orthographic projections of pixel circuits for adjacent sub-pixels. This symmetrical design approach simplifies layout design and reduces manufacturing complexity while maintaining the required circuit functionality for high-resolution displays
2Measurement precision
If more circuit components are added to improve driving capability, then the light-emitting element can be controlled more precisely, but the area occupied by the pixel circuit increases
Solution Approach 1:
The patent utilizes vertical stacking and multi-layer routing to arrange circuit components in three-dimensional space rather than only planar arrangement. This allows multiple circuit elements to be positioned in different vertical layers, reducing the horizontal footprint of the pixel circuit while maintaining precise driving current control through multiple control circuits
Solution Approach 2:
The control circuits are designed to perform multiple functions: the first control circuit controls the driving circuit, the second control circuit controls the light-emitting element, and the light-emitting control circuit coordinates both. This multi-functionality reduces the need for separate dedicated circuits, thereby reducing overall pixel circuit area while maintaining precise control
3Illumination intensity
If the pixel circuit layout is optimized for high resolution, then display quality improves, but signal interference between adjacent circuits increases
Solution Approach 1:
The patent introduces shield lines and isolation structures between adjacent pixel circuits and signal lines. These intermediary elements act as barriers to electromagnetic interference, preventing signal coupling between neighboring circuits while allowing the pixel circuits to be closely spaced for high-resolution displays
Solution Approach 2:
The mirror-symmetrical arrangement of pixel circuits creates balanced electromagnetic field distributions, which helps cancel out interference signals. The symmetrical layout ensures that interference patterns from adjacent pixels are mirrored, reducing net interference effects and allowing denser pixel packing
Data Source
AI summary
A display substrate and a display panel are provided. The display substrate includes: a base substrate; and a plurality of sub-pixels. Each sub-pixel includes a light-emitting element and a pixel circuit; the pixel circuit includes a driving circuit, a data writing circuit, a first control circuit, a second control circuit, and a light-emitting control circuit; the driving circuit is configured to control the driving current flowing through the light-emitting element; the light-emitting control circuit is configured to apply the driving current to the light-emitting element; the first control circuit is configured to write a reference voltage into the driving circuit; the second control circuit is configured to write an initial voltage into the first electrode of the light-emitting element; and orthographic projections of at least part of pixel circuits of every two adjacent sub-pixels in a same row of sub-pixels on the base substrate are mirror-symmetrical.