Flexible Display Bending Portion Width Design
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Solution Overview
Problem
Conventional display devices face challenges in achieving a narrow border during bending, leading to interference issues that result in dark spots and cracking of the film layer, which affects the performance and durability of flexible display devices.
Innovation Solution
A flexible display device design featuring a flexible substrate with a first and second portion connected by a bending portion, where the width of the bending portion is greater than or equal to half the circumference of a circle with a radius equal to the bending radius, ensuring a sufficient distance between display pixels and the bending interface, thus preventing interference and maintaining structural integrity during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the border width is reduced to achieve a narrow border design, then the display area is increased, but interference during bending occurs causing dark spots and film layer cracking
Solution Approach 1:
The flexible substrate is divided into three distinct portions: a first portion containing display pixels, a second portion without display pixels, and a bending portion connecting them. This segmentation allows the bending portion to be specifically designed with sufficient width to prevent film layer cracking while the first portion maximizes the display area, thus resolving the contradiction between increasing display area and maintaining film layer integrity during bending.
Solution Approach 2:
The bending portion acts as an intermediary element between the display portion and the non-display portion. By designing this intermediary bending portion with a specific width (greater than or equal to half the circumference of a circle with radius equal to the bending radius), it provides a buffer zone that prevents interference during bending, thereby protecting the film layer integrity while allowing the display area to be maximized.
2Reliability
If the bending portion width is increased to prevent interference during bending, then film layer cracking is avoided, but the border width increases
Solution Approach 1:
The bending portion width is set to a specific threshold (greater than or equal to half the circumference of a circle with radius equal to the bending radius), which is sufficient to prevent film layer cracking during bending. This partial action approach ensures that the bending portion has just enough width to prevent interference without excessively increasing the border width, thus maximizing the display area while maintaining film layer integrity.
3Area of stationary object
If the flexible substrate is bent to achieve narrow border, then the border width is reduced, but signal line breakage occurs
Solution Approach 1:
The flexible substrate is segmented into distinct portions, with the bending portion specifically designed to handle the mechanical stress of bending. This segmentation isolates the signal lines in the first portion from the bending stress, as the bending portion absorbs the deformation, thereby preventing signal line breakage while still achieving a narrow border and maximizing display area.
Solution Approach 2:
The bending portion serves as an intermediary that protects the signal lines by absorbing the bending stress. By positioning this bending portion between the display portion and the non-display portion, it acts as a buffer that prevents the bending stress from reaching the signal lines, thus maintaining signal line integrity while enabling narrow border design.
Data Source
AI summary
The present disclosure relates to a flexible display device, including a flexible substrate. The substrate includes a first portion, a second portion and a bending portion connecting the first portion to the second portion, wherein the flexible substrate has a thickness T. A plurality of display pixels is located at a side of the first portion of the flexible substrate. A supporting layer is located at a side of the flexible substrate facing away from the plurality of display pixels and includes a first supporting layer corresponding to the first portion and a second supporting area corresponding to the second portion. A thickness of the first supporting layer is T1, a thickness of the second supporting layer is T2, and a width of the bending portion is W, whereinW≥(2T+T1+T2)π2.Therefore, a narrow border is achieved, and the problem of interference during bending is alleviated.