In-cell Touch Panel Self-Capacitance Electrode Integration
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Solution Overview
Problem
In-cell touch panels face increased production costs and reduced production efficiency due to the need for additional film layers and manufacturing processes, which affect the thickness and light transmittance of the display panel.
Innovation Solution
The in-cell touch panel design integrates self-capacitance electrodes and wires on the same layer as the data lines, with electrical connections via through holes and recessed portions in an interlayer insulating layer, allowing for reduced manufacturing processes and improved signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional film layers and manufacturing processes are added to in-cell touch panels, then touch functionality is achieved, but production costs increase and production efficiency decreases
Solution Approach 1:
The patent merges the touch electrode layer with the liquid crystal display layer by integrating self-capacitance electrodes directly into the LCD structure. The electrodes are formed on the same substrate as the liquid crystal display, eliminating the need for separate touch panel layers and reducing the total number of manufacturing steps while maintaining touch detection functionality
Solution Approach 2:
The patent creates a multi-functional structure where the same layer serves both as the liquid crystal display layer and the touch sensing layer. The self-capacitance electrodes are integrated into the LCD substrate, allowing the panel to perform both display and touch detection functions simultaneously through a unified structure
2Reliability
If additional film layers are added to in-cell touch panels, then touch functionality is achieved, but the thickness of the display panel increases
Solution Approach 1:
The patent combines the touch electrode functions within the existing LCD layer structure rather than adding separate touch layers. The self-capacitance electrodes are formed on the same substrate as the liquid crystal display, integrating touch functionality into the display thickness without adding extra film layers
3Reliability
If additional film layers are added to in-cell touch panels, then touch functionality is achieved, but light transmittance decreases
Solution Approach 1:
The patent integrates the touch electrodes directly into the LCD layer, eliminating additional film layers that would block light. The self-capacitance electrodes are formed on the same substrate as the liquid crystal display, ensuring maximum light transmittance by avoiding extra optical interfaces and materials
4Productivity
If self-capacitance electrodes are arranged on the same layer as data lines, then production efficiency improves, but electrical insulation between electrodes and data lines becomes more difficult
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the self-capacitance electrodes and the data lines. This insulating layer is formed between the electrodes and data lines on the same substrate, providing electrical isolation while allowing both components to coexist on the same layer without increasing overall device complexity
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 reduces production costs and enhances production efficiency while maintaining the aperture ratio and improving the signal-to-noise ratio for touch sensing, enabling a thinner and more efficient touch panel with improved touch accuracy.
Implementation Method 1
When a human body does not touch the screen of the panel, the capacitance produced by the self-capacitance electrodes is at a fixed value. When a human body touches the screen of the panel, the capacitance produced by corresponding self-capacitance electrodes is the sum of the fixed value and the capacitance due to the human body.
Implementation Method 2
an interlayer insulating layer is provided between the self-capacitance electrodes and the wires; the self-capacitance electrodes are electrically connected with corresponding wires by through holes of the interlayer insulating layer
Data Source
AI summary
An in-cell touch panel and a display device comprising the same are provided. in-cell touch panel, comprising: an array substrate, comprising data lines provided thereon; a plurality of self-capacitance electrodes, which are provided on a same layer and independent of each other on the array substrate, wherein the self-capacitance electrodes are insulated from the data lines; a touch detection chip; and a plurality of wires for connecting the self-capacitance electrodes to the touch detection chip, wherein the wires and the data lines are arranged on the same layer and insulated from each other and have a same wiring direction. The in-cell touch panel has reduced production costs and improved production efficiency.