Display Substrate Auxiliary Electrode Line Impedance Reduction
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Solution Overview
Problem
In OLED display products, the impedance of control signal lines in test circuits increases with routing distance, leading to uneven signal strength and affected test results, which complicates panel testing and display functionality.
Innovation Solution
A display substrate design that includes a base substrate with sub-pixels, data lines, control signal lines, data test lines, a test circuit, and an auxiliary electrode line, where the test circuit is connected to the data lines and control signal lines, and the auxiliary electrode line is connected in parallel with the control line to reduce impedance and improve signal transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the control signal line routing distance is increased to reach more test units, then the coverage of the test circuit is improved, but the impedance of the control signal line increases leading to uneven signal strength
Solution Approach 1:
The control signal line is divided into multiple segments with parallel auxiliary electrode lines. Each segment has its own auxiliary electrode line running alongside it, creating multiple independent signal transmission paths that reduce the effective routing distance and impedance for each segment.
Solution Approach 2:
The auxiliary electrode line acts as an intermediary element that runs parallel to the control signal line. This parallel auxiliary electrode line serves as a reference or shield that stabilizes the impedance of the control signal line, preventing signal distortion over long routing distances.
2Adaptability or versatility
If the control signal line is extended to control more switches, then the functionality of the test circuit is improved, but the impedance increases causing signal distortion
Solution Approach 1:
The control signal transmission path is segmented into multiple parallel sections, each with its own auxiliary electrode line. This segmentation allows the control signal to be transmitted through shorter, more manageable segments rather than one long continuous line, reducing cumulative impedance effects.
Solution Approach 2:
The auxiliary electrode line changes the electrical parameters of the control signal line by providing a parallel conductive path. This modifies the impedance characteristics of the control signal line, stabilizing signal strength and preventing distortion across multiple test units.
3Area of stationary object
If the routing distance of the control signal line is increased, then the test circuit can cover more areas, but the impedance increases leading to uneven signal distribution
Solution Approach 1:
The control signal line is segmented into multiple parallel sections distributed across the display substrate. Each segment has its own auxiliary electrode line, creating a distributed impedance control system that maintains uniform signal strength across large coverage areas.
Solution Approach 2:
The auxiliary electrode line is positioned in a different spatial dimension (parallel to but separate from the control signal line). This dimensional arrangement allows the control signal line to extend across large areas while the auxiliary electrode line provides localized impedance control at each segment, decoupling coverage area from impedance effects.
Data Source
AI summary
A display substrate and a display device are disclosed. The display substrate includes a base substrate, a plurality of sub-pixels, a plurality of data lines, a control signal line, data test lines, a test circuit and an auxiliary electrode line. The test circuit includes a plurality of test units, each of at least one of the plurality of test units includes a first control line and a plurality of control switches, the auxiliary electrode line and the first control line are connected in parallel with each other, and an orthographic projection of a part of at least one control switch among the plurality of control switches on a substrate surface of the base substrate is located between an orthographic projection of the first control line and an orthographic projection of the auxiliary electrode line on the substrate surface of the base substrate.