Capacitive Touch Panel Black Matrix Integration
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Solution Overview
Problem
Capacitive touch panels combining on cell and in cell modes have improved yield but result in increased overall thickness, which is a drawback in terms of both manufacturing cost and display device design.
Innovation Solution
A capacitive touch panel design where the first and second metal touch electrode layers form a black matrix that also functions as touch electrodes, reducing the need for a separately provided black matrix and thereby decreasing the overall thickness, while maintaining touch functionality and shading light from display components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a capacitive touch panel combines on cell mode and in cell mode to provide touch scanning lines and sensing lines on both sides of the opposed substrate, then yield is improved, but overall thickness is increased
Solution Approach 1:
The patent merges the black matrix layer and touch electrode layer into a single integrated structure. The first and second metal touch electrode layers are formed in the same layer as the black matrix, eliminating the need for separate black matrix materials and reducing overall panel thickness while maintaining both light-shielding and touch sensing functions
Solution Approach 2:
The metal touch electrode layers serve dual functions: they act as both the black matrix for light shielding and as touch sensing electrodes for detecting touch input. This multi-functionality reduces the number of separate layers needed, thereby reducing overall thickness while maintaining yield improvements from the combined on cell and in cell mode architecture
2Productivity
If touch electrode lines are provided between opposed substrate and polarizer (on cell mode), then yield is improved and display region area is maintained, but overall thickness is increased
Solution Approach 1:
The patent combines the black matrix formation process with touch electrode line formation into a single integrated layer structure. The first metal touch electrode layer is formed on the side of the opposed substrate away from the polarizer, and the second metal touch electrode layer is formed on the side facing the polarizer, with both layers serving as part of the black matrix structure
Solution Approach 2:
The patent distributes touch electrode lines across two different planes (first metal touch electrode layer on one side of the opposed substrate, second metal touch electrode layer on the other side), creating a three-dimensional arrangement that maintains display area while reducing the need for thick single-layer structures
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 reduces the overall thickness of the capacitive touch panel by integrating the black matrix function into the touch electrode layers, enhancing touch sensitivity and eliminating moiré patterns, and is applicable in various display devices like LCDs and OLEDs.
Implementation Method 1
the first and second metal touch electrode layers form a black matrix... shading light from display components
Implementation Method 2
a capacitive touch panel combining the on cell touch panel with the in cell touch panel respectively provides touch scanning lines and touch sensing lines on both sides of the opposed substrate of the display panel to form a mutual capacitance at intersections of the touch scanning line and the touch sensing line
Implementation Method 3
When a human body touches the touch panel, an electric field of the human body will act on the mutual capacitance, so the capacitance value of the mutual capacitance will be changed
Data Source
AI summary
A capacitive touch panel, a method of determining touch position thereof and a display device are disclosed. The capacitive touch panel comprises a first substrate and a second substrate opposed to each other, the first substrate being provided with a black matrix. The black matrix is formed of a first metal touch electrode layer provided on a side of the first substrate away from the second substrate and a second metal touch electrode layer provided on a side of the first substrate facing the second substrate; and the first metal touch electrode layer comprises a plurality of first touch electrode lines, and the second metal touch electrode layer comprises a plurality of second touch electrode lines intersecting with the first touch electrode lines.