Touch Panel Dummy Patterns for Display Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Capacitive touch panel sensors in mobile devices cause display quality degradation due to reflective differences between patterned and unpatterned areas, leading to image quality issues.
Innovation Solution
A touch panel design that includes a base substrate with alternating patterns of sensing electrodes and dummy patterns, along with insulation layers, arranged in a matrix to minimize reflectance differences and overlap areas, using transparent conductive materials and potentially a reflective index matching layer to reduce visible patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capacitive touch panel sensors are used to enable touch functionality, then touch sensing capability is improved, but display quality degrades due to reflective differences between patterned and unpatterned areas
Solution Approach 1:
The patent applies local quality by introducing dummy patterns in unpatterned areas with the same material composition and optical properties as the sensing electrode patterns. This creates local uniformity in reflectance characteristics across the display surface, eliminating the visual contrast between patterned and unpatterned regions while preserving touch sensitivity in both areas.
2Measurement precision
If sensing electrodes are arranged in a matrix pattern to improve touch detection precision, then measurement precision is improved, but reflectance differences become more noticeable causing display quality degradation
Solution Approach 1:
The patent uses copying by creating dummy patterns that replicate the material composition, thickness, and optical properties of the actual sensing electrode patterns. These copied patterns are placed in unpatterned areas to mimic the reflectance characteristics of the sensing electrodes, making the display surface appear uniform and eliminating visible pattern effects.
Data Source
AI summary
A touch panel includes a base substrate, a first pattern, a first insulation layer, a second pattern, and a second insulation layer. The first pattern is disposed on the base substrate. The first pattern includes a driving line extended in a second direction that crosses a first direction and first sensing electrodes that are electrically connected to the driving line and arranged in the second direction. The first insulation layer is disposed on the first pattern and the base substrate covering the first pattern. The second pattern is disposed on the first insulation layer. The second pattern includes a sensing line extended in the first direction and second sensing electrodes that are electrically connected to the sensing line and arranged in the first direction. The second insulation layer is disposed on the second pattern and the first insulation layer covering the second pattern.