In-cell Touch Panel Hollowed Electrodes Narrow Frame
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Solution Overview
Problem
Self-capacitive touch panels face challenges in achieving high touch control sensitivity while maintaining a narrow frame design, as reducing electrode area increases touch blind regions and adding more electrodes increases the number of conductive wires, which is unfavorable for a narrow frame.
Innovation Solution
The in-cell touch panel incorporates self-capacitive electrodes with hollowed-out regions, reducing their area and inherent capacitance, which enhances capacitance variation and sensitivity, and reuses the common electrode layer as self-capacitive electrodes to minimize the touch blind region and maintain a narrow frame design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the area of self-capacitive electrodes is reduced to increase capacitance variation, then touch control sensitivity is improved, but the touch blind region increases
Solution Approach 1:
The self-capacitive electrodes are designed with hollowed-out regions, creating a porous structure that reduces the effective area of each electrode. This reduces the inherent capacitance and increases capacitance variation when touched, improving sensitivity without proportionally increasing the touch blind region because the hollowed-out areas do not contribute to the blind region in the same way solid electrodes would
Solution Approach 2:
The electrode structure is segmented into multiple regions including conductive regions and hollowed-out regions. This segmentation allows the electrode to maintain electrical functionality while reducing overall area and optimizing the balance between sensitivity and touch blind region
2Measurement precision
If more self-capacitive electrodes are added to improve touch detection coverage, then measurement precision is improved, but the number of conductive wires increases making narrow frame design difficult
Solution Approach 1:
The common electrode layer serves dual functions: it acts as both the common electrode for display operation and as the self-capacitive electrodes for touch sensing. This eliminates the need for separate self-capacitive electrode structures and their associated conductive wires, simplifying the overall structure and enabling narrow frame design
Solution Approach 2:
The patent merges the common electrode layer with the self-capacitive electrode function by reusing the same electrode layer for both display and touch sensing purposes. This consolidation reduces the total number of electrodes and conductive wires required, directly addressing the contradiction between coverage and 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 improves touch control sensitivity by increasing capacitance variation and reducing the touch blind region without increasing the number of electrodes, while ensuring a narrow frame and cost-effective manufacturing process.
Implementation Method 1
when the human body touches the screen, the capacitance applied to the self-capacitive electrode to which a touch position corresponds is at the sum of the fixed value plus capacitance of the human body, and a touch control detection chip can determine the touch position by detecting the capacitance variation of each self-capacitive electrode
Data Source
AI summary
An in-cell touch panel and a display device are provided, and the in-cell touch panel includes: an upper substrate and a lower substrate which are opposite to each other; a plurality of separate self-capacitive electrodes arranged in an array and in a same layer; and a plurality of conductive wires respectively connected with the self-capacitive electrodes. Both the conductive wires and the self-capacitive electrodes are arranged at a side, facing the lower substrate, of the upper substrate, or at a side, facing the upper substrate, of the lower substrate; and the self-capacitive electrodes each are provided with a plurality of hollowed-out regions. The in-cell touch panel can improve the touch control sensitivity of the touch panel while ensuring a narrow frame design.