Common Electrode Through-Hole Curved Edge for Display Panel Capacitance
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Solution Overview
Problem
Current display panels face challenges in achieving high display quality due to capacitance issues between the common electrode and scan lines, which affect transmittance and overall display performance.
Innovation Solution
The display panel design incorporates a common electrode with a through hole having a specific curved edge shape that overlaps with the scan line, reducing capacitance and enhancing transmittance by optimizing the overlap area and distances between the common electrode and data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the common electrode is disposed close to the scan line to reduce the area, then the display panel becomes more compact, but the capacitance between the common electrode and scan line increases
Solution Approach 1:
The common electrode is divided into multiple segments separated by through-holes, which allows the electrode to be positioned closer to scan lines while reducing parasitic capacitance through the segmented structure
Solution Approach 2:
Through-holes filled with insulating material act as intermediaries between the common electrode and scan lines, reducing direct capacitive coupling while allowing the electrode to maintain close proximity for compact design
2Reliability
If the common electrode overlaps with the scan line to reduce the overlapping area, then the capacitance is reduced, but the transmittance is affected
Solution Approach 1:
The through-holes in the common electrode are designed with curved edges instead of sharp corners, which reduces electromagnetic field concentration and optimizes the balance between capacitance reduction and light transmittance
Solution Approach 2:
The shape parameters of the through-holes (curvature radius, position, size) are optimized to achieve the desired balance between reducing parasitic capacitance and maintaining high light transmittance in the display panel
3Length of stationary object
If the display panel is made thinner to meet compactness requirements, then the overall size is reduced, but the display quality and control over capacitance become more difficult
Solution Approach 1:
The through-holes are strategically positioned at specific locations where the common electrode overlaps with scan lines, providing localized capacitance reduction exactly where needed in the thin panel structure
Solution Approach 2:
The problem of capacitance control is addressed by introducing through-holes that extend through the thickness dimension of the common electrode, allowing capacitance management in the vertical dimension while maintaining thin overall panel profile
Data Source
AI summary
A display device includes: a substrate; a scan line disposed on the substrate; a common electrode disposed on the substrate and including a through hole having a curved edge, wherein the through hole and at least a portion of the scan line are overlapped; a pixel electrode disposed on the substrate and including a slit; and an active layer disposed on the substrate, wherein the active layer and at least a portion of the slit are overlapped.