Array Substrate with Suspending Traces for InCell Touch Display
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Solution Overview
Problem
Current self-capacitance touch technologies in InCell displays face issues with light leakage and optical performance due to the interference of electric fields with liquid crystal pixels, leading to Mura defects and compromised display quality.
Innovation Solution
An array substrate design featuring a common electrode, insulation layer, and sensing layer with spatially arranged touch electrodes, touch traces, and suspending traces, where the suspending traces connect to touch traces through holes, reducing electric field interference and stabilizing voltage signals to prevent light leakage and Mura defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the common electrode is separated into several sensors in matrix arrangement with cut slits, then the touch sensing function is improved, but electric field interference affects liquid crystal steering causing light leakage and Mura defects
Solution Approach 1:
The patent introduces suspending traces as intermediary elements positioned between adjacent touch electrodes. These suspending traces act as mediators that guide and stabilize the electric field lines, preventing them from directly interfering with the liquid crystal molecules in the pixel regions. The suspending traces effectively decouple the electric field distribution from the problematic direct path between cut slits and liquid crystal, thereby eliminating light leakage and Mura defects while preserving touch sensing functionality.
2Quantity of substance
If touch electrodes are arranged in matrix with cut slits, then sensor density is improved, but optical performance deteriorates due to light leakage
Solution Approach 1:
The suspending traces serve as electric field guides that intercept and redirect field lines before they can reach the liquid crystal layer. By positioning these intermediary traces in the intervals between touch electrodes, the patent creates a controlled electric field path that passes through the suspending traces rather than directly through the pixel regions, thereby preventing light leakage while maintaining high sensor density.
Solution Approach 2:
The suspending traces are electrically connected to touch traces, creating equipotential regions that stabilize the electric field distribution. This equipotential arrangement ensures that the electric field lines follow predictable paths through the suspending traces, preventing unpredictable field interactions with the liquid crystal that would cause optical defects, thereby maintaining both high sensor density and good optical performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces light leakage and improves optical performance by minimizing electric field intrusion into the liquid crystal layer, thereby enhancing display quality and reducing the occurrence of vertical linear wavy Mura phenomena.
Implementation Method 1
The current self-capacitance touch technical solution, the common electrode is separated to several sensors in matrix arrangement
Implementation Method 2
When the electric field formed in the signal transmission of the data line passes through the sensors of the cut slits, it will affect the liquid crystal relative to the cut slits
Implementation Method 3
it will affect the liquid crystal relative to the cut slits, and will interfere the liquid crystal steering
Data Source
AI summary
An array substrate comprises a common electrode, an insulation layer, and a sensing layer, the common electrode comprises the touch electrodes, they are in spaced arrangement, the sensing layer comprises the touch traces and the suspending traces, the touch trace is disposed above the touch electrode and electrically connects to the touch electrode by the through hole, the suspending trace is disposed above the interval between two of the touch electrodes and electrically connects to the touch trace by the first trace. Using the electrical connection between the suspending trace and the touch trace, the electrical potentials of the suspending trace and the touch electrode are the same, the difference of the electric field between the interval area of the adjacent touch electrodes and the touch electrode decreases for avoiding the electric field formed in the data line under the touch electrode ingresses into the liquid crystal layer.