In Cell Touch Screen Conductive Shade Bar Multiplexing
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Solution Overview
Problem
Existing in-cell touch screens face challenges in maintaining high manufacturing efficiency and accuracy while minimizing the impact on pixel aperture ratio, as they require complex electrode structures that can increase manufacturing costs and affect light transmittance.
Innovation Solution
The implementation of a conductive shade structure with first and second shade bars arranged in parallel directions, electrically connected to touch electrodes, allows for self-capacitive touch functionality without compromising the aperture ratio by multiplexing the first shade bar as a signal line, enabling effective touch control and signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex electrode structures are used for self-capacitive touch functionality, then touch accuracy is improved, but manufacturing cost increases and pixel aperture ratio decreases
Solution Approach 1:
The patent makes the first shade bar serve dual functions: as a light-shading structure for display quality and as a conductive signal line for touch detection. This multi-functionality eliminates the need for separate touch electrode structures, reducing manufacturing complexity while maintaining self-capacitive touch accuracy
Solution Approach 2:
The patent combines the shade structure and touch electrode structure into a single integrated design. The first shade bar is electrically connected to the touch electrode, merging the light-blocking function and touch-sensing function into one component, thereby simplifying the overall electrode structure while preserving touch detection accuracy
2Adaptability or versatility
If separate touch electrode structures are added, then touch functionality is improved, but manufacturing cost increases
Solution Approach 1:
The first shade bar is designed to perform both light-shading and touch-sensing functions simultaneously. By making it conductive and electrically connecting it to the touch electrode, the patent eliminates the need for separate touch electrode structures, thereby reducing manufacturing steps and costs while maintaining full touch functionality
Solution Approach 2:
The shade structure itself is utilized as the touch detection element. The first shade bar's conductive property allows it to serve as both a display component and a touch sensor, making the system self-sufficient without requiring additional dedicated touch electrode layers or structures
3Measurement precision
If more electrode structures are integrated, then touch control accuracy is improved, but light transmittance decreases
Solution Approach 1:
The first shade bar performs dual roles as a light-shading element for display quality and a conductive touch sensor. This integration means no additional electrode structures are required, preserving light transmittance while achieving accurate self-capacitive touch control through the multi-functional shade bar structure
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 enhances touch accuracy and maintains high light transmittance by integrating the shade structure into the touch screen, reducing manufacturing costs and improving the overall efficiency of the touch control function without affecting the pixel aperture ratio.
Implementation Method 1
According to the self-capacitance principle, a plurality of self-capacitive touch electrodes may be arranged in the same layer and insulated from each other in the touch screen. When the human body does not touch the screen, the capacitance born by each touch electrode may be a constant value, when the human body touches the screen, the capacitance born by the corresponding touch electrode may be the constant value superimposed on the body capacitance
Data Source
AI summary
The present disclosure provides an in cell touch screen including a plurality of touch electrodes and a shade structure, wherein the shade structure includes a plurality of first shade bars arranged in parallel along a first direction and a plurality of second shade bars arranged in parallel along a second direction perpendicular to the first direction; and the first shade bars are conductive, and the touch electrodes are electrically connected to the first shade bars, respectively.