Rigid Bridge Board for Display Panel Bonding
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Solution Overview
Problem
The existing display devices face challenges with increased bezel or thickness due to the space required for bending flexible printed circuit boards, which can lead to bonding failures and distribution defects caused by bending stress and elongation.
Innovation Solution
A display device design that eliminates the need for flexible printed circuit boards by using a bridge board with a rigid material, such as a cured resin, to connect the display panel directly to a bonding substrate, reducing the space and stress, and preventing bending failures and distribution defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flexible printed circuit board is used to connect the display panel to the bonding substrate, then the display device can be assembled, but the bezel or thickness increases due to the space required for bending the flexible printed circuit board
Solution Approach 1:
The patent extracts and removes the flexible printed circuit board from the bonding structure, replacing it with a rigid bridge board that directly connects the display panel to the bonding substrate. This eliminates the need for bending space and reduces the overall device thickness and bezel size while maintaining electrical connection functionality.
Solution Approach 2:
The patent introduces a rigid bridge board as an intermediary component between the display panel and the bonding substrate. This bridge board serves as a mediator that provides electrical connection without requiring the bending space of a flexible circuit board, thereby reducing the device's overall dimensions.
2Length of stationary object
If the curvature of the flexible printed circuit board is reduced to reduce bending space, then the space for bending is reduced, but the bending stress increases causing bonding failure
Solution Approach 1:
The patent removes the flexible printed circuit board that is subject to bending stress entirely, replacing it with a rigid bridge board structure. This extraction eliminates the source of bending stress and associated bonding failures while achieving the goal of reduced bending space.
Solution Approach 2:
The patent changes the fundamental parameter of the connection board from flexible to rigid material. This parameter change transforms the connection structure from one that requires bending (and thus experiences stress) to one that is inherently rigid and stress-free, thereby improving bonding reliability.
3Reliability
If a flexible printed circuit board is used for connection, then electrical connection can be established, but distribution defects occur due to elongation of the flexible printed circuit board
Solution Approach 1:
The patent extracts the flexible printed circuit board that causes elongation and distribution defects, replacing it with a rigid bridge board. This eliminates the elongation problem while maintaining the electrical connection function, thereby improving manufacturing precision and distribution uniformity.
Data Source
AI summary
A display device includes a display panel, a bonding substrate and a bridge board. The display panel includes a pixel array disposed on a base substrate and an input pad electrically connected to the pixel array. The bonding substrate is disposed under the display panel and includes an output pad. The bridge board is bonded to the input pad of the display panel and the output pad of the bonding substrate to electrically connect the display panel to the bonding substrate, wherein the bridge board includes a rigid material.