Display Substrate Circuit Layout for Uniform Dummy Pixel Loading
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Solution Overview
Problem
The arrangement of a pixel missing region in a display panel leads to non-uniform display due to altered loading on signal lines, resulting in lower voltage and current, causing darker display in affected areas.
Innovation Solution
A display substrate design with a dummy pixel region incorporating a pixel missing region and a redundant region, featuring specific signal line connections and overlapping areas to maintain consistent signal line loading and voltage across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dummy pixel regions are added to the display substrate, then manufacturing flexibility and yield are improved, but voltage drops and non-uniformity in initial signal lines worsen
Solution Approach 1:
The patent applies local quality by differentiating the capacitance values of storage capacitors based on their location. Pixel driving circuits in the dummy pixel region are configured with larger capacitance values than those in the display region. This local differentiation compensates for the voltage drops that occur in initial signal lines extending to dummy pixels, thereby maintaining display uniformity while preserving manufacturing flexibility.
Solution Approach 2:
The patent changes the capacitance parameter of storage capacitors in pixel driving circuits located in the dummy pixel region. By increasing the capacitance value in these specific regions, the system compensates for voltage drops in the initial signal lines, ensuring uniform signal distribution across both display and dummy pixel regions.
2Area of stationary object
If initial signal lines extend to dummy pixel regions, then circuit coverage is improved, but resistance and voltage drops increase
Solution Approach 1:
The patent implements local quality by configuring pixel driving circuits in different regions with different capacitance values. Circuits in the dummy pixel region use larger capacitance values to compensate for the increased resistance and voltage drops associated with extended initial signal lines, thereby maintaining signal stability across the entire substrate area.
Solution Approach 2:
The patent applies beforehand cushioning by pre-configuring larger capacitance values in storage capacitors of pixel driving circuits that will experience voltage drops. This anticipatory measure compensates for the expected voltage drops in extended initial signal lines before the display operates, ensuring signal stability is maintained.
3Reliability
If pixel driving circuits in dummy regions have higher capacitance values, then voltage compensation is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by differentiating capacitance values only in specific regions (dummy pixel regions) rather than uniformly across the entire display. This targeted approach provides necessary voltage compensation where needed while minimizing the overall complexity increase, as the majority of pixel driving circuits in the display region maintain standard capacitance values.
Data Source
AI summary
A display substrate has a display region and a dummy pixel region including at least one pixel missing region and a redundant region; the display substrate includes a base substrate and a driving circuit layer including a plurality of circuit units, at least one of which includes a pixel driving circuit and initial signal lines; the pixel driving circuit includes first and second pixel driving circuits in the display region and the redundant region, respectively, and a capacitance value of a storage capacitor in the first pixel driving circuit is less than that in the second pixel driving circuit; the initial signal lines include first and second initial signal lines extending along first and second directions, respectively; the first initial signal line is electrically connected to at least a part of the second initial signal lines crossing the first initial signal line.