Touch Panel Protrusion for Thinner Adhesive Layer
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Solution Overview
Problem
Existing display devices with touch panels and front windows face challenges in achieving thinness due to the thickness of adhesive layers and the fragility of film-based touch panels under physical stress, which affects image quality and detection precision.
Innovation Solution
A display device design featuring a film-based touch panel with a protrusion for connecting to the flexible printed circuit, allowing a thinner adhesive layer and reducing the risk of physical stress on the adhesive, while using thermal adhesion and anisotropic conductive films for reliable connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a glass base is used for the touch panel to reduce thickness, then the touch panel becomes thinner, but the adhesive layer must be thicker than the flexible printed circuit to compensate for the rigid base, preventing sufficient thinning of the display device
Solution Approach 1:
The adhesive layer is segmented into two distinct regions: a first adhesive layer in the display area and a second adhesive layer in the non-display area. This segmentation allows the adhesive layer to be thinner in the display area where it is most critical for device thinness, while maintaining sufficient adhesion in the non-display area.
Solution Approach 2:
Different regions of the adhesive layer are given different thicknesses based on local requirements. The first adhesive layer in the display area is made thinner to enable device thinness, while the second adhesive layer in the non-display area is made thicker to provide sufficient bonding strength, thus optimizing the structure locally.
2Volume of moving object
If the flexible printed circuit is placed on the rear side of the touch panel to enable thin adhesive layer, then the adhesive layer thickness is reduced, but the distance between the touch panel and display panel increases, preventing device thinning
Solution Approach 1:
The connection structure utilizes the thickness dimension by forming a protrusion on the touch panel base that extends in the thickness direction. This allows the flexible printed circuit to be connected at a location that maintains short distances in the planar direction while accommodating the adhesive layer thickness reduction through the protrusion structure.
3Reliability
If a protective film is pasted to the film-based touch panel to protect against physical stress, then the film is protected, but the thickness of the entire touch panel increases, preventing sufficient thinning
Solution Approach 1:
The protrusion structure on the touch panel base serves as a cushioning element that absorbs and distributes physical stress before it can reach and damage the film-based touch panel. This beforehand cushioning protection eliminates the need for additional protective films that would increase thickness.
Solution Approach 2:
The protrusion acts as an intermediary protective structure between the external environment and the film-based touch panel. It mediates the physical stress, protecting the fragile film without requiring additional protective layers that would increase the overall thickness.
4Reliability
If thermal adhesion is used to connect the flexible printed circuit to the touch panel, then reliable connection is achieved, but thermal deformation of the film base may occur, affecting detection precision and image quality
Solution Approach 1:
The touch panel base is segmented into a display area and a non-display area, with the connection portion located in the non-display area. This segmentation isolates the thermal adhesion process to a specific region away from the display area, preventing thermal deformation from affecting detection precision and image quality.
Solution Approach 2:
The protrusion structure serves as an intermediary that facilitates thermal adhesion while protecting the film base. It provides a dedicated connection zone that can withstand thermal processes without transmitting harmful thermal deformation to the sensitive film areas.
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 a thinner display device with improved image quality and detection precision by minimizing adhesive layer thickness and preventing thermal deformation of the touch panel, thus enhancing the reliability and appearance of the display.
Implementation Method 1
a state where a front window 6 is mounted on and pasted to the touch panel 1 in FIG. 1 on the front surface side with an adhesive layer 7 in between
Implementation Method 2
the touch panel 10 and the flexible printed circuit 2 are connected together through thermal adhesion with an anisotropic conductive film in between
Data Source
AI summary
The display device according to the present invention has a display panel as well as a touch panel and a front window provided on the display panel on the front side, where the touch panel has a base made of a film and wires formed on the surface of the base, while the connection portion B for connecting the touch panel and the flexible printed circuit is provided in a protrusion of the base, the touch panel and the front window are pasted together with an adhesive layer in between, and at least the adhesive layer is not provided to the protrusion.