Touch-Sensing Display Panel Black Matrix Electrode Integration
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Solution Overview
Problem
Conventional touch-sensing display panels suffer from deteriorated display quality due to noticeable differences in transmittance between touch-sensing and non-touch-sensing areas, which affects brightness and user experience.
Innovation Solution
The integration of in-cell type capacitive touch-sensing units, featuring a touch-sensing substrate with parallel first and second electrodes, a dielectric layer, and a black matrix with pixel openings, which are designed to be electrically insulated and covered by the black matrix to maintain display quality and prevent visibility of the touch-sensing electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch-sensing pads are fabricated by transparent conductive layer (e.g., ITO), then touch-sensing functionality is achieved, but transmittance difference between touch-sensing and non-touch-sensing areas causes deteriorated display quality
Solution Approach 1:
The patent extracts the touch-sensing electrodes from the traditional transparent conductive layer configuration and relocates them to the black matrix layer. By taking out the electrodes from the light-transmitting path and embedding them within the black matrix, the solution eliminates the transmittance difference problem while preserving touch-sensing functionality through the black matrix's inherent light-blocking properties.
Solution Approach 2:
The patent merges the touch-sensing electrode function with the black matrix structure. By combining these two previously separate elements into a single integrated layer, the solution achieves both light-blocking (for display quality) and electrical conduction (for touch sensing) functions simultaneously, resolving the transmittance contradiction.
2Reliability
If touch-sensing electrodes are made visible to ensure electrical functionality, then touch-sensing performance is maintained, but display quality deteriorates due to noticeable electrodes affecting brightness
Solution Approach 1:
The black matrix serves as an intermediary that simultaneously provides light-blocking properties (hiding the electrodes) and electrical conduction (enabling touch sensing). This intermediary element resolves the contradiction by being both optically opaque and electrically conductive, allowing electrodes to remain functional while invisible.
Solution Approach 2:
The patent utilizes the black color of the black matrix to mask the electrodes. By changing the visual appearance of the electrode structure through the black matrix's light-absorbing properties, the solution makes the electrodes imperceptible while maintaining their electrical functionality for touch sensing.
3Ease of operation
If conventional transparent conductive layers are used for touch-sensing pads, then touch-sensing operation is enabled, but aperture ratio is compromised due to transmittance differences
Solution Approach 1:
The patent extracts the electrodes from the transparent conductive layer and places them within the black matrix layer. This extraction removes the electrodes from the light-transmitting path, preventing aperture ratio compromise while maintaining touch-sensing operation through the black matrix's conductive properties.
Solution Approach 2:
The black matrix is given multi-functionality, serving both as a light-blocking element (for display quality and aperture ratio) and as an electrical conductor (for touch sensing). This universal element resolves the contradiction by performing both optical and electrical functions simultaneously.
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 solution maintains favorable display quality by ensuring the touch-sensing electrodes are not noticeable, thereby preserving brightness and aperture ratio, while effectively integrating touch-sensing functionality into the display panel without compromising display performance.
Implementation Method 1
The dielectric layer is at least disposed at intersections of the first touch-sensing electrodes and the second touch-sensing electrodes such that the second touch-sensing electrodes are electrically insulated from the first touch-sensing electrodes
Implementation Method 2
the black matrix is disposed between the first touch-sensing electrodes and the first substrate and is disposed between the second touch-sensing electrodes and the first substrate, wherein the black matrix has a plurality of pixel openings arranged in array
Implementation Method 3
When the touch-sensing display panel is touched by fingers of users or a stylus, electrical characteristics (e.g. capacitance, current, resistance and so on) of the touch-sensing units located at the position that is touched by fingers or stylus changes
Data Source
AI summary
A touch-sensing display panel including an active device array substrate, a touch-sensing substrate and a display medium is provided. The touch-sensing substrate includes a first substrate, first touch-sensing electrodes, second touch-sensing electrodes, a dielectric layer and a black matrix. The first touch-sensing electrodes are parallel with each other and disposed on the first substrate. Each of the first touch-sensing electrodes has a plurality of first openings, respectively. Each of the second touch-sensing electrodes has a plurality of second openings, respectively. The second touch-sensing electrodes are intersected with the first touch-sensing electrodes. The black matrix is disposed between the first touch-sensing electrodes and the first substrate and is disposed between the second touch-sensing electrodes and the first substrate, wherein the black matrix has a plurality of pixel openings arranged in array. Each of the pixel openings is corresponding to one of the first openings or one of the second openings, respectively.