Folded Touch Sensing Film for Narrow Bezel Design
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Solution Overview
Problem
Existing touch display devices face challenges in reducing the length of electrode wires in the peripheral area without affecting their design and performance, which hinders the development of narrow bezels and full-screen designs.
Innovation Solution
A touch display device design that includes a touch sensing film with folded ends, adhesive layers, and a light-shielding layer, where the touch sensing film is bent from outside to inside to create overlapping and non-overlapping regions, allowing for reduced electrode wire length and protection within the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the touch sensing film is folded from outside to inside to reduce peripheral area length, then the bezel size is reduced and electrode wire exposure is prevented, but the structural complexity increases and manufacturing difficulty increases
Solution Approach 1:
The touch sensing film is folded from outside to inside, creating nested overlapping regions where the peripheral area is folded back onto itself. This nesting structure reduces the external peripheral length while containing the electrode wires within the folded layers, preventing exposure and eliminating the need for additional light-shielding layers in the folded regions.
Solution Approach 2:
The folding operation transforms the two-dimensional layout of the touch sensing film into a three-dimensional structure with overlapping layers. By utilizing the third dimension (folding depth), the peripheral area is compacted without compromising the functional area, thereby reducing bezel size while maintaining electrode wire integrity.
2Length of stationary object
If the touch sensing film is folded to reduce peripheral area length, then the bezel size is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The folding of the touch sensing film is performed as a preliminary step before final assembly and adhesive application. By pre-folding the touch sensing film to the desired configuration, the subsequent assembly process becomes simpler and more precise, as the folded structure is already in place and subsequent layers can be aligned more easily.
Solution Approach 2:
The folding process involves controlled changes in geometric parameters such as fold angle, overlap distance, and curvature radius. By optimizing these parameters within specific ranges, the folding precision is maintained while achieving the desired bezel reduction. The adhesive layer thickness parameters are also optimized to accommodate the folded structure.
3Stability of the object's composition
If adhesive layers are used to adhere the folded touch sensing film, then the folded structure is secured, but the device complexity and manufacturing steps increase
Solution Approach 1:
Multiple adhesive layers are used to combine different functional elements: the first adhesive layer secures the folded touch sensing film to itself, the second adhesive layer attaches the light-shielding layer, and the third adhesive layer bonds the display module. By merging the adhesive application step with the assembly process, the number of separate manufacturing steps is reduced while ensuring stable bonding of the folded structure.
Data Source
AI summary
A touch display device is provided in some embodiments of the present disclosure, including a cover plate, a touch sensing film, and a display module. The touch sensing film is disposed on the cover plate, and the touch sensing film includes a first surface and a second surface opposite to the first surface. The touch sensing film is bended from outside to inside, so that the first surface or the second surface is folded to define an overlapping region and a non-overlapping region.