Display Sensing-Line Shielding Through Power-Line Layout
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Solution Overview
Problem
Existing display devices experience noise interference between sensing and display signal lines, which affects the performance and accuracy of touch and pressure input sensing.
Innovation Solution
The display device incorporates a power line that overlaps or surrounds the sensing signal line, positioned between the display signal line and the sensing signal line, to minimize noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sensing signal line and display signal line are placed close to each other in the non-display area, then device complexity is reduced, but noise interference increases affecting sensing accuracy
Solution Approach 1:
A power line is introduced as an intermediary element positioned between the sensing signal line and display signal line in the non-display area. This power line acts as a shield that blocks electromagnetic noise from the display signal line from interfering with the sensing signal line, while maintaining a compact overall layout.
Solution Approach 2:
The patent utilizes the vertical stacking dimension by placing the power line in a different conductive layer between the sensing and display signal lines. This layered arrangement in the vertical dimension effectively separates the signal paths and reduces noise coupling without increasing horizontal space occupation.
2Object-affected harmful factors
If power line is positioned to overlap and surround sensing signal line, then noise interference is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the geometric parameters of the power line, such as its width and position relative to the sensing signal line, to achieve effective noise shielding. By carefully controlling these parameters, the power line can surround or overlap the sensing signal line to maximize shielding effectiveness while maintaining manufacturability.
3Measurement precision
If power line is placed between display signal line and sensing signal line, then sensing accuracy is improved, but device complexity increases
Solution Approach 1:
The power line serves multiple functions simultaneously: it provides electrical power to the pixel and acts as a noise shield for the sensing signal line. By making the power line multi-functional, the patent improves sensing accuracy without adding separate dedicated shielding structures, thus avoiding excessive complexity.
Data Source
AI summary
A display device includes a pixel in a display area, sensing electrodes overlapping the pixel, a sensing pad in a non-display area, a sensing connection line in the non-display area, and electrically connected to the sensing pad, a sensing signal line in the non-display area, and electrically connected to the sensing electrodes, and a power line extending from the non-display area, and electrically connected to the pixel, wherein the sensing signal line is electrically connected to the sensing connection line through an opening or indentation defined by the power line.