Touch Member Insulating Layer Parasitic Capacitance Reduction
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Solution Overview
Problem
The existing display devices face challenges with reduced touch sensitivity due to parasitic capacitance formed between touch conductive layers and display conductive layers.
Innovation Solution
The display device incorporates a touch member with a specific structure, including a first touch insulating layer, a first touch conductive layer with a touch bridge electrode, a second touch insulating layer made of organic material, and third touch conductive layers forming sensing lines, which helps in reducing parasitic capacitance and improving touch characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple touch conductive layers are used to form the touch member, then the touch member can provide comprehensive touch sensing functionality, but parasitic capacitance is generated between touch conductive layers and display conductive layers which reduces touch sensitivity
Solution Approach 1:
An organic insulating layer is introduced as an intermediary between the touch conductive layers and display conductive layers. This intermediate layer effectively reduces parasitic capacitance while preserving the multi-layer touch sensing functionality. The organic material serves as a mediator that blocks capacitive coupling between conductive elements.
Solution Approach 2:
The patent changes the material parameter of the insulating layer from conventional inorganic materials to organic materials. This parameter change significantly reduces parasitic capacitance values while maintaining the necessary electrical insulation properties, thereby improving touch sensitivity without sacrificing functionality.
2Reliability
If a second touch insulating layer is used in the touch member structure, then touch characteristics can be improved, but defects may occur in the second touch insulating layer
Solution Approach 1:
The patent changes the material composition parameter of the second touch insulating layer to organic materials, which have different physical and chemical properties that reduce defect formation. This material parameter change improves reliability while minimizing manufacturing defects.
Solution Approach 2:
The touch member structure employs a composite material approach by combining organic insulating layers with conductive layers. This composite structure optimizes both electrical performance and mechanical integrity, reducing defects while maintaining reliable touch characteristics.
Data Source
AI summary
A display device includes a display member and a touch member disposed on the display member. The touch member includes a first touch insulating disposed on the display member, a first touch conductive layer disposed on the first touch insulating layer and including a touch bridge electrode, a second touch insulating layer disposed on the first touch conductive layer, including an organic material, and including a first contact hole penetrating the second touch insulating layer in a thickness direction, a second touch conductive layer disposed on the second touch insulating layer and including a first lower sensing line overlapping the second touch bridge electrode, and a third touch conductive layer disposed on the second touch conductive layer and including a first upper sensing line overlapping the first lower sensing line. A width of the first upper sensing line is greater than a width of the first lower sensing line.