In-cell Touch Screen Self-Capacitance Electrode Design
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Solution Overview
Problem
Current in-cell touch panels face challenges with low touch accuracy and high manufacturing costs due to the need for additional layers and complex manufacturing processes, which also affect the signal-to-noise ratio and productivity.
Innovation Solution
The implementation of a capacitive in-cell touch panel with a common electrode layer divided into mutually independent self-capacitance electrodes and leads connected to a touch detection chip, allowing for improved capacitance variation detection and reduced manufacturing complexity by reusing the common electrode layer, thereby enhancing touch accuracy and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional layers are added to achieve touch sensing in in-cell touch panel, then touch sensing function is enabled, but manufacturing complexity and cost increase
Solution Approach 1:
The common electrode layer is designed to serve dual purposes: as the common electrode for liquid crystal display and as the touch sensing electrode. By making the common electrode layer universal, the patent eliminates the need for separate touch sensing layers, thereby reducing manufacturing complexity while maintaining touch sensing functionality
Solution Approach 2:
The patent merges the common electrode layer with the touch sensing electrode function. Instead of having separate layers for common electrode and touch sensing, the design combines these functions into a single layer, reducing the overall structure complexity and manufacturing steps
2Measurement precision
If additional layers are added for touch sensing, then touch accuracy can be improved, but manufacturing cost increases
Solution Approach 1:
By making the common electrode layer universal for both display and touch sensing functions, the patent reduces material costs and manufacturing expenses while maintaining touch accuracy through the capacitance detection mechanism
Solution Approach 2:
The common electrode layer serves itself by simultaneously functioning as both the display common electrode and the touch sensing electrode, eliminating the need for separate components and reducing overall manufacturing cost
3Reliability
If complex manufacturing processes are used to achieve in-cell touch panel, then touch sensing is enabled, but productivity decreases
Solution Approach 1:
By combining the common electrode layer and touch sensing electrode into a single layer, the patent reduces the number of manufacturing steps and process complexity, thereby improving productivity while maintaining touch sensing capability
Solution Approach 2:
The universal common electrode layer that serves both display and touch functions simplifies the manufacturing process by eliminating separate production steps, thereby increasing manufacturing productivity
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 improves touch accuracy by increasing the signal-to-noise ratio and reduces manufacturing costs by eliminating the need for additional layers, thus enhancing productivity and supporting a more efficient and cost-effective touch sensing mechanism.
Implementation Method 1
the touch detection chip is configured to determine a touch position by determination of capacitance variation of adjacent self-capacitance electrodes connected with different leads in a touch period
Data Source
Figure 1~2
Figure 3
Figure 4a
AI summary
An in-cell touch panel and a display device are disclosed. A plurality of mutually independent self-capacitance electrodes (05) arranged in the same layer are disposed in the touch panel in accordance with the self-capacitance principle. A touch detection chip (04) can determine the touch position by the detection of the capacitance variation of the self-capacitance electrode (05). Compared with the case that body capacitance only acts on the projected capacitance in mutual capacitance, the in-cell touch panel can effectively improve the signal-to-noise ratio of touch and hence can improve the accuracy of touch sensing.