Touch Sensor Adhesive Layer and Resin Layer Design
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Solution Overview
Problem
Existing touch-sensor-equipped display devices face challenges in achieving high positional accuracy and detectability, particularly with the electrostatic capacitance type method, where accurate alignment of electrode layers and attachment to the cover glass are crucial for precise detection, and the use of adhesive tapes complicates re-bonding and increases positional displacement errors as the display area increases.
Innovation Solution
A touch-sensor-equipped display device is designed with a thermal adhesive film and a photo-curable resin layer, where the touch sensor is supported by a transparent substrate, and the conductive layers are arranged in orthogonal directions for accurate detection, and the resin layer suppresses double reflection for improved visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive tape is used to bond members together, then bonding is easy to perform, but positional accuracy deteriorates due to inability to re-bond and increased displacement errors
Solution Approach 1:
The adhesive tape is divided into multiple small segments rather than using a single continuous tape. This segmentation allows each segment to be independently positioned and adjusted, enabling re-bonding operations without affecting the entire bonding structure. The segmented approach maintains bonding ease while significantly improving positional accuracy by allowing corrective adjustments.
Solution Approach 2:
Alignment marks are provided on the adhesive tape before bonding occurs. These preliminary markings guide the precise positioning of members during the bonding process, allowing operators to achieve accurate alignment before the adhesive sets. This preliminary action ensures high positional accuracy while maintaining the ease of bonding process.
2Area of stationary object
If display area is increased, then device functionality is improved, but positional accuracy deteriorates due to amplified displacement errors
Solution Approach 1:
The adhesive tape is divided into multiple small segments distributed across the large display area. This segmentation allows each segment to be independently positioned with high precision, preventing the amplification of displacement errors that would occur with a single continuous tape spanning the entire large area. Each segment can be accurately aligned and bonded without affecting other regions.
Solution Approach 2:
Alignment marks serve as intermediary reference elements between the adhesive tape segments and the members being bonded. These marks provide a common reference framework across the entire large display area, enabling consistent positional accuracy to be maintained across all segments regardless of the overall device size.
3Adaptability or versatility
If electrode layers are overlaid for electrostatic capacitance detection, then touch detection capability is achieved, but positional accuracy deteriorates due to alignment requirements
Solution Approach 1:
Alignment marks are provided on the adhesive tape that interfaces with the electrode layers. These marks serve as intermediary reference points that guide the precise overlay of multiple electrode layers during assembly. By providing clear visual or physical references, the alignment marks enable accurate positioning of conductive layers without requiring complex alignment mechanisms, thus maintaining both touch detection capability and alignment accuracy.
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 enables high positional accuracy and superior detectability of touch inputs while reducing image reflection, resulting in a more reliable and visually appealing touch-sensor-equipped display device.
Implementation Method 1
an adhesive layer formed of a thermal adhesive film, wherein the thermal adhesive film bonds the at least one support film and the transparent substrate
Implementation Method 2
the resin layer is made of a photo-curable resin... the resin layer suppresses double reflection for improved visibility
Data Source
AI summary
A touch-sensor-equipped display device includes a touch sensor 10, a transparent substrate 1, an image-display body 2, an adhesive layer formed of a thermal adhesive film 5, and a resin layer 3. The touch sensor 10 includes a first conductive layer 12A composed of a plurality of first electric conductors 13A, a second conductive layer 12B composed of a plurality of second electric conductors 13B, and at least one support film 11. The plurality of first electric conductors 13A extend in a different direction from a direction in which the plurality of second electric conductor 13B extend. The thermal adhesive film 5 bonds the at least one support film 11 and the transparent substrate 1. The resin layer 3 is disposed between the touch sensor 10 and the image-display body 2 and is made of a photo-curable resin.