Display Substrate Bending Structure for Narrower Bezel Link Lines
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Solution Overview
Problem
Existing display devices face challenges in reducing the bezel area without compromising structural integrity and functionality, particularly in implementing a maximum screen size with minimal bezel width.
Innovation Solution
The display device incorporates a first substrate with a display area and a non-display area featuring a bending area, a second substrate facing the first substrate with a gap, a dummy substrate between them, an etching prevention member, and a link line unit formed on the etching prevention member to pattern etching and reduce the bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the bezel area is reduced to maximize screen size, then the display area increases, but the structural integrity and functionality of the link line area deteriorate
Solution Approach 1:
The patent divides the glass substrate into multiple etched portions (first bending etched portion, second bending etched portion, third bending etched portion) in the non-display area. This segmentation allows the link line area to be bent and repositioned, enabling bezel reduction while maintaining structural integrity through distributed etching features rather than a single large modification.
Solution Approach 2:
The patent introduces a dummy substrate as an intermediary element positioned in the non-display area. This dummy substrate serves as a mediator that allows the link line area to be bent and connected while maintaining structural support. The etching prevention member on the dummy substrate protects the link line area during the etching process, enabling precise bezel reduction without compromising functionality.
2Area of moving object
If the bezel width is reduced through patterning etching, then the screen size increases, but the manufacturing complexity increases
Solution Approach 1:
The etching process is divided into multiple discrete portions (first, second, and third bending etched portions) with specific orientations and positions. This segmentation simplifies manufacturing by allowing each etched portion to be processed independently with standard etching techniques, rather than requiring a single complex full-area etch process.
Solution Approach 2:
An etching prevention member is formed on the dummy substrate before the etching process. This preliminary action protects specific areas during etching, ensuring precise control over where etching occurs. The pre-formed protection layer simplifies the manufacturing process by preventing errors and reducing the need for complex masking procedures during etching.
3Length of stationary object
If the link line area is bent to reduce bezel, then the bezel width decreases, but the reliability of the link line connection deteriorates
Solution Approach 1:
The bending is achieved through multiple discrete etched portions rather than a single continuous bend. The first bending etched portion, second bending etched portion, and third bending etched portion are positioned at different locations and orientations, distributing the mechanical stress across multiple points. This segmentation maintains link line connection reliability by preventing concentration of stress at a single bend point.
Solution Approach 2:
The dummy substrate with the etching prevention member serves as an intermediary that maintains the structural relationship between the link line area and the display area during bending. This intermediary element ensures that the link line connection remains reliable by providing a stable reference structure that controls the bending geometry and prevents excessive deformation.
Data Source
AI summary
A light-emitting display device may include a first substrate including a display area and a non-display area including a bending area, a second substrate disposed on the display area of the first substrate to face the first substrate with a certain gap, a dummy substrate disposed to face a lower portion of the first substrate with the bending area of the non-display area therebetween, an etching prevention member provided on the first substrate and the dummy substrate to overlap the non-display area, and a link line unit formed on the etching prevention member.