Striped Common Electrode Slit Geometry for FFS Touch Display Yield
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Solution Overview
Problem
The integration of touch control structures into conventional display panels, particularly in fringe field switching (FFS) mode, often results in defects such as short-circuits due to inadequate design of common electrodes, which complicates the production and reduces yield.
Innovation Solution
The design incorporates a specific configuration of stripe-shaped common electrodes with strategically placed slits, including a first slit, a second slit, and a connection slit, where the center lines of these slits intersect in a manner that their orthogonal projections form a triangle on the substrate, preventing adjacent electrodes from shorting and improving production yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If common electrodes are divided to support touch control function in FFS display panels, then touch control capability is improved, but the risk of short-circuits between adjacent electrodes increases
Solution Approach 1:
The common electrode is divided into multiple independent strip-shaped electrodes with slits between them. Each strip electrode is electrically isolated from adjacent strips by the slit structure, enabling independent control for touch sensing while preventing short-circuits. The slits create physical gaps that ensure electrical isolation between neighboring conductive elements.
Solution Approach 2:
The slit structure acts as an intermediary element between adjacent strip electrodes. This intermediate structure provides both electrical isolation and mechanical support, allowing the divided common electrodes to function for touch control without direct contact that would cause short-circuits.
2Measurement precision
If the entire surface of common electrodes is divided for touch control, then touch sensitivity is improved, but production yield decreases due to short-circuit defects
Solution Approach 1:
The common electrode is segmented into multiple strip-shaped electrodes with slits throughout the entire surface. This segmentation enables comprehensive touch sensitivity across the display area while the slit design prevents short-circuits during fabrication, thereby maintaining high production yield.
Solution Approach 2:
The slit structure provides localized electrical isolation at critical interfaces between adjacent strip electrodes. This local quality enhancement ensures that touch sensitivity is maintained across the entire surface while preventing defects at specific locations where electrodes are closest.
3Illumination intensity
If dual-domain structure is adopted to improve viewing angles, then viewing angle performance is improved, but the complexity of common electrode design increases
Solution Approach 1:
The common electrode is divided into strip-shaped segments that can be independently configured to support dual-domain structures. This segmentation simplifies the overall design by breaking down the complex dual-domain requirement into manageable strip electrode units with standardized slit patterns.
Solution Approach 2:
The slit configuration in the strip electrodes can be asymmetrically designed to accommodate different domain orientations in dual-domain structures. This asymmetric design allows optimization for specific viewing angle requirements while maintaining a relatively simple overall electrode architecture.
Data Source
AI summary
The present disclosure provides an integrated touch control display panel, including a substrate, a plurality of stripe shaped common electrodes sequentially arranged in a first direction and extending in a second direction intersecting with the first direction, and a plurality of common electrode slits located between any two adjacent stripe shaped common electrodes. Each section of the common electrode slit includes a first slit, a second slit, and a connection slit located between the first slit and the second slit. An orthogonal projection of a center line of the connection slit on the substrate is located inside or coincides with a triangle formed by an orthogonal projection of the intersection point of center lines of the first and second slits, the intersection point of center lines of the first and connection slits, and the intersection point of center lines of the second and connection slits on the substrate.