Flexible Display Device Circuit Board Segmentation
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Solution Overview
Problem
Existing flexible display devices face challenges in maintaining panel integrity and flexibility due to interference from rigid circuit boards and integrated circuit chips during deformation, which can lead to damage, and require innovative solutions to enhance design freedom and reduce thickness.
Innovation Solution
A flexible display device design featuring a flexible printed circuit board positioned on the rear surface of the display panel with a protection member interposed between the panel and integrated circuit chips, allowing for flexible arrangement and protection against contact and external shocks, while also reducing thickness through strategic placement and design of printed circuit patterns on both surfaces of the board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circuit boards and integrated circuit chips are laminated on the flexible display panel, then the display device can function properly, but the flexibility is reduced and the display panel may be damaged during deformation
Solution Approach 1:
The circuit board is divided into a first circuit board portion and a second circuit board portion, allowing different sections to serve different functions. The first portion maintains flexibility when laminated on the display panel, while the second portion extends outward to accommodate integrated circuit chips without compromising panel flexibility or causing damage during deformation.
Solution Approach 2:
The circuit board configuration transitions from a purely two-dimensional lamination on the panel surface to a three-dimensional structure where the second circuit board portion extends outward in a different spatial dimension. This allows integrated circuit chips to be mounted on the extended portion without interfering with the flexible display panel's deformation capabilities.
2Adaptability or versatility
If the display device is deformed into a flexed or rolled state, then portability is improved, but the integrated circuit chips may interfere with and contact the display panel causing damage
Solution Approach 1:
The circuit board is segmented into two portions with the integrated circuit chips mounted on the second portion that extends away from the display panel. This spatial separation ensures that during flexing or rolling, the chips remain isolated from the panel surface and cannot cause damage through contact or interference.
Solution Approach 2:
The second circuit board portion acts as an intermediary structure that connects the integrated circuit chips to the display panel system while maintaining physical separation. This intermediary extends the chips away from the panel, preventing direct contact during deformation while still allowing electrical connectivity.
3Ease of operation
If the display device thickness is reduced to improve flexibility, then portability is enhanced, but the arrangement space for circuit boards and integrated circuit chips is limited
Solution Approach 1:
The circuit board configuration utilizes three-dimensional space by extending the second circuit board portion outward from the display panel surface. This vertical/dimensional arrangement allows integrated circuit chips to be mounted on the extended portion, effectively using space in the thickness direction rather than consuming additional lateral area on the panel surface.
Solution Approach 2:
The circuit board is designed as a flexible substrate that can be laminated thin on the display panel while still providing sufficient area for component mounting. The flexible nature allows the board to conform to the thin profile requirement while the extended portion provides adequate space for integrated circuit chip placement.
Data Source
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Figure 3
AI summary
A flexible display device includes a flexible display panel, a flexible printed circuit board extending from the display panel, an integrated circuit chip that is mounted on at least one surface of the flexible printed circuit board and is configured to drive the display panel, and a protection member attached to a rear surface of the display panel. When the flexible printed circuit board is flexed to be partially positioned on the rear surface of the display panel, the protection member is positioned between the display panel and the integrated circuit chip. The flexible display device prevents the integrated circuit chip stacked with the display panel from making direct contact with the display panel using the protection member. Thus, even if the display device is deformed into, for example, a flexed or rolled state, it is possible to prevent the display panel from being damaged.