Display Substrate Aperture Ratio and Parasitic Capacitance
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Solution Overview
Problem
Display substrates with existing structures fail to sufficiently increase the aperture ratio and are plagued by longitudinal spots due to parasitic capacitance between pixel electrodes and data wirings.
Innovation Solution
A display substrate design featuring a transparent electrode that covers the gate and data wirings, with an organic layer containing color filters overlapping the data wiring, and a pixel electrode insulated from the transparent electrode, which minimizes parasitic capacitance and enhances aperture ratio by forming a storage capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the storage wiring overlaps the data wiring to increase aperture ratio, then the aperture ratio increases, but longitudinal spots occur due to parasitic capacitance between pixel electrodes and data wirings
Solution Approach 1:
The patent extracts the data wiring from the overlapping region with the pixel electrode by routing it through an opening in the pixel electrode. This separation eliminates the parasitic capacitance between the data wiring and pixel electrode while maintaining the aperture ratio benefit of the overlapping storage wiring structure.
Solution Approach 2:
The patent resolves the conflict by moving the data wiring to a different spatial dimension - routing it through an opening in the pixel electrode plane rather than having it overlap in the same plane. This dimensional separation eliminates parasitic capacitance while preserving the aperture ratio.
2Ease of manufacture
If conventional wiring structures are used, then manufacturing is simple, but aperture ratio cannot be sufficiently increased and display quality deteriorates due to longitudinal spots
Solution Approach 1:
The patent segments the wiring structure by separating the data wiring path from the pixel electrode area through openings. This segmentation allows the data wiring to be routed independently through specific openings without affecting the overall manufacturing process complexity, while enabling significant aperture ratio improvement.
3Device complexity
If data wiring overlaps pixel electrode, then routing is simplified, but parasitic capacitance increases causing flicker and kick-back
Solution Approach 1:
The patent introduces openings in the pixel electrode as intermediary structures that allow the data wiring to pass through without direct contact. These openings act as mediators that simplify the wiring routing while simultaneously eliminating the parasitic capacitance that causes flicker and kick-back, thereby improving display stability.
Data Source
AI summary
A display substrate that has increased aperture ratio is presented. The display substrate includes a base substrate, a first metal pattern formed on the base substrate and a gate wiring and a gate electrode. A first insulating layer is formed on the base substrate covering the first metal pattern. A second metal pattern is formed on the first insulating layer including a data wiring crossing the gate wiring, a source electrode connected to the data wiring and a drain electrode separated from the source electrode. A second insulating layer is formed on the base substrate covering the second metal pattern. A transparent electrode is formed on the second insulating layer. An organic layer is formed on the transparent electrode, and a pixel electrode is formed on the organic layer being insulated with the transparent electrode, and contacted to the drain electrode. The organic layer may comprise red, green and blue color filters.