Touch Panel Electrode Alignment with Black Matrix
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Solution Overview
Problem
The arrangement of rhombic touch electrodes in liquid crystal display (LCD) screens affects the electrical field between the pixel and common electrodes, leading to adverse effects on the display quality due to changes in coupling capacitance, which compromises the deflection of liquid crystal molecules.
Innovation Solution
A touch panel design featuring quadrilateral transparent electrodes arranged alternatively in driving and inductive electrode units, with their boundaries covered or coinciding with a black matrix, preventing changes in coupling capacitance from affecting the electrical field between the pixel and common electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rhombic touch electrodes are arranged in the common electrode layer, then the touch screen can detect touch points, but the boundaries of the touch electrodes cross with pixel unit boundaries causing coupling capacitance changes that affect liquid crystal molecule deflection and display quality
Solution Approach 1:
The patent changes the electrode arrangement from a symmetric rhombic pattern to an asymmetric linear pattern where transparent electrodes are aligned parallel to the black matrix boundaries. This asymmetric arrangement ensures that electrode boundaries do not cross pixel unit boundaries, eliminating the coupling capacitance interference problem while maintaining touch detection functionality.
Solution Approach 2:
The patent applies different arrangement strategies to different parts of the electrode structure. The transparent electrodes are specifically arranged to align with black matrix boundaries in regions where they would otherwise interfere with pixel boundaries, while maintaining continuous conductivity through ITO bridges. This localized adjustment resolves the conflict between touch detection and display quality.
2Adaptability or versatility
If rhombic touch electrodes are used, then touch functionality is achieved, but the coupling capacitance changes adversely affect the electrical field between pixel electrode and common electrode
Solution Approach 1:
The patent extracts the harmful coupling capacitance effect by removing the rhombic electrode geometry that causes boundary crossings. The linear electrode arrangement separated the touch detection function from the harmful electromagnetic interference, allowing the electrical field between pixel and common electrodes to remain stable while preserving touch functionality.
Solution Approach 2:
The black matrix serves as an intermediary structure that the transparent electrodes align with. By using the black matrix boundaries as a reference for electrode placement, the patent creates a mediating arrangement that prevents direct interference between electrode boundaries and pixel boundaries, thereby eliminating coupling capacitance issues.
3Reliability
If transparent electrodes are arranged to align with black matrix boundaries, then coupling capacitance interference is reduced, but the electrode structure becomes more complex with ITO bridges
Solution Approach 1:
The patent segments the transparent electrode structure into discrete linear electrodes separated by black matrix regions. Each transparent electrode is an independent conductive element that can be precisely positioned, and ITO bridges are added only where needed to maintain connectivity. This segmentation allows for precise boundary alignment while managing complexity through modular construction.
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
This design enhances the display quality by minimizing the impact of coupling capacitance changes on liquid crystal molecule deflection, thereby improving the overall performance of the LCD screen.
Implementation Method 1
an electrical field in the human body will affect the capacitance of the coupling capacitor
Implementation Method 2
a coupling capacitor is formed between the driving electrode and the inductive electrode
Implementation Method 3
liquid crystal molecules in a liquid crystal layer may be deflected under the effect of an electrical field between a common electrode and a pixel electrode
Data Source
AI summary
The present disclosure provides a touch panel, a method for producing the same and a display apparatus. The touch panel includes: a first substrate, a second substrate opposed to the first substrate, a display medium layer between the first substrate and the second substrate, a black matrix arranged on one of the first substrate and the second substrate, a plurality of driving electrode units and a plurality of inductive electrode units arranged alternatively on the other one of the first substrate and the second substrate, and each of the plurality of driving electrode units or the plurality of inductive electrode units includes a plurality of transparent electrodes and projections of boundaries of the transparent electrodes onto the substrate having the black matrix are covered by the black matrix or coincide with the range of the black matrix.