Touch Screen Reinforcing Member for Adhesion and Flatness
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Solution Overview
Problem
The manufacturing of flat panel displays with integrated touch screens faces challenges in reducing defect rates and improving yield due to their complex structures and high production costs, which affect appearance quality, durability, and reliability.
Innovation Solution
A touch screen design that includes an insulating substrate with sensing and peripheral regions, sensing electrodes, wirings, pads, an optical film, a flexible circuit board, and a reinforcing member, where the optical film is spaced apart from the flexible circuit board, and an anisotropic conductive film is used between the pads and the flexible circuit board, with a reinforcing member that provides improved adhesion and surface flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the optical film is placed close to the flexible circuit board to reduce the number of layers, then the device complexity is reduced, but the adhesion between the flexible circuit board and pads deteriorates
Solution Approach 1:
A reinforcing member is introduced as an intermediary component between the flexible circuit board and the pads. This reinforcing member has a height that fills the gap between the optical film and the flexible circuit board, providing a stable bonding surface that enhances adhesion while maintaining the optical film at an appropriate distance from the flexible circuit board.
2Ease of manufacture
If the flexible circuit board is adhered directly to the pads without a reinforcing member, then the manufacturing process is simplified, but the adhesion and reliability deteriorate
Solution Approach 1:
The reinforcing member serves as a mediator that simplifies the manufacturing process by providing a pre-formed bonding surface. Instead of requiring direct precise alignment and bonding between the flexible circuit board and pads, the reinforcing member with its specific height facilitates easier assembly while ensuring reliable adhesion.
3Shape
If the optical film is placed close to the flexible circuit board to reduce surface step differences, then the appearance quality is improved, but the adhesion between components deteriorates
Solution Approach 1:
The reinforcing member acts as an intermediary structure that maintains the optical film at an optimized distance from the flexible circuit board. Its height is specifically designed to fill the gap and provide a stable bonding surface, ensuring both surface flatness for appearance quality and sufficient adhesion for reliability.
4Shape
If the gap between the optical film and flexible circuit board is reduced to prevent stains and pressing marks, then the appearance quality is improved, but the adhesion and durability deteriorate
Solution Approach 1:
The reinforcing member provides a stable bonding surface that enables the optical film to be positioned at an appropriate distance from the flexible circuit board without causing stains or pressing marks. This intermediary structure ensures both surface flatness for appearance quality and sufficient bonding strength for durability.
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
This design enhances the adhesion of the flexible circuit board to the pads, reduces surface step differences, and improves the appearance and reliability of the touch screen, preventing defects like stains and pressing marks, while maintaining durability and electrical contact reliability.
Implementation Method 1
an anisotropic conductive film interposed between the plurality of pads and the flexible circuit board
Implementation Method 2
a reinforcing member disposed on the flexible circuit board corresponding to the plurality of pads
Data Source
AI summary
A touch screen and a display device having the same are disclosed. The touch screen includes an insulating substrate including a sensing region and a peripheral region, a plurality of sensing electrodes disposed in the sensing region, a plurality of wirings disposed in the peripheral region and electrically connected to the plurality of sensing electrodes, a plurality of pads disposed in the peripheral region and electrically connected to the plurality of wirings, an optical film disposed on an upper portion of the plurality of sensing electrodes, a flexible circuit board electrically connected to the plurality of pads, and a reinforcing member disposed on the flexible circuit board corresponding to the plurality of pads, wherein a first height measured from the insulating substrate to an upper surface of the reinforcing member is equal to a second height measured from the insulating substrate to an upper surface of the optical film.