Touch Display Spacer Positioning to Reduce Capacitance Noise
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Solution Overview
Problem
In-cell type touch display apparatuses experience bending and lagging noise due to drastic capacitance changes and deformation of spacers when pressed, which degrade the touch effect.
Innovation Solution
A touch display apparatus design with a spacer positioned inside a touch-sensing electrode opening, maintaining a distance of at least 5 μm between the spacer's edge and the electrode, reducing capacitance and minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the touch-sensing electrode is disposed close to the spacer in an in-cell type touch display apparatus, then the structure is compact and easier to manufacture, but the capacitance between the electrode and spacer changes drastically when pressed, resulting in bending noise and degraded touch effect
Solution Approach 1:
A bridge structure is introduced as an intermediary element between the touch-sensing electrode and the spacer. This bridge physically connects the electrode to the spacer while providing mechanical support and electrical isolation, preventing direct contact that would cause drastic capacitance changes. The bridge acts as a mediator that maintains the necessary electrical separation while still allowing the electrode to function properly in contact with the liquid crystal layer.
2Ease of operation
If the in-cell type touch display apparatus is pressed, then the touch-sensing electrode bends towards the lower substrate enabling touch detection, but the capacitance changes overly drastically causing bending noise
Solution Approach 1:
The bridge structure serves as a mediator that allows the electrode to bend for touch detection while preventing excessive capacitance changes. The bridge provides mechanical support that controls the bending behavior, ensuring the electrode can deflect for touch sensing but returns to its original position without causing drastic capacitance variations that would generate bending noise.
Solution Approach 2:
The invention changes the physical parameters of the electrode structure by introducing the bridge, which modifies the mechanical and electrical properties. The bridge alters the bending stiffness and electrical capacitance characteristics, allowing the electrode to bend for touch detection while maintaining stable capacitance values that prevent bending noise generation.
3Force
If the spacer is deformed when the touch display apparatus is pressed, then the structure can accommodate touch pressure, but the time required for recovery results in lagging noise
Solution Approach 1:
The bridge structure acts as an intermediary that reduces the mechanical load on the spacer during touch pressure application. By providing additional structural support and distributing the force, the bridge allows the spacer to deform less and recover faster, minimizing the recovery time that would otherwise cause lagging noise while still accommodating touch pressure.
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
The solution significantly reduces lagging noise and improves the touch effect by maintaining low capacitance between the touch-sensing electrode and the spacer, ensuring accurate touch location determination.
Implementation Method 1
the capacitance between the touch-sensing electrode and the members (e.g. the spacer) on the lower substrate of the display panel changes overly drastically
Data Source
AI summary
A touch display apparatus including a first substrate, a first sub-pixel, a spacer, a second substrate, and a touch-sensing electrode is provided. The first sub-pixel is disposed on the first substrate. The spacer is disposed on the first substrate. The touch-sensing electrode is disposed on the second substrate and has a first opening. The spacer is located inside the first opening in an orthogonal projection direction. A distance D is defined between an outline of an orthogonal projection of the spacer on the first substrate and an outline of an orthogonal projection of the first opening on the first substrate, and D≥5 μm.