OLED Display Wall Parts Control Bonding Material Spreading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display devices using OLEDs, the control of shield materials during bonding is poor, leading to spreading and protrusion issues, which affect substrate cutting and result in waste and cutting defects.
Innovation Solution
The implementation of a display device structure with first and second wall parts made from the same material as the display elements, using bonding materials to control the spreading of the second bonding material, and incorporating additional wall parts to accurately position and contain the bonding materials, reducing the cutting margin and preventing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shield material is provided on exterior periphery part of substrate to block OLED from outside air during bonding, then protection of OLED is improved, but control of shield material dimensions becomes poor and it spreads and protrudes from intended location
Solution Approach 1:
The invention divides the shielding function into two separate components: a first wall part made from display element material on the first substrate, and a second wall part made from structure body material on the second substrate. This segmentation allows each wall part to be independently controlled and positioned, preventing the spreading and protrusion issues that occur with a single shield material while maintaining the protective function.
Solution Approach 2:
The bonding material serves as an intermediary that bonds the first wall part and second wall part together in the display region. This intermediary approach allows the two wall parts to be securely connected while maintaining precise dimensional control, as the bonding material can be carefully applied and controlled in the bonding process.
2Reliability
If shield material is used for sealing, then sealing function is improved, but shield material protrudes from intended arrangement location affecting substrate cutting
Solution Approach 1:
By segmenting the sealing structure into first and second wall parts located on opposite substrates, the invention prevents material protrusion that would interfere with substrate cutting. The wall parts are positioned and bonded in a controlled manner that maintains clean edges for cutting operations.
Solution Approach 2:
The first wall part is formed on the first substrate before bonding, and the second wall part is formed on the second substrate before bonding. This preliminary formation of wall parts ensures that the sealing structure is already in place and properly positioned before the bonding process begins, preventing any protrusion during subsequent cutting operations.
3Strength
If bonding material is used to bond substrates, then bonding function is improved, but bonding material spreads and protrudes from intended location
Solution Approach 1:
The invention segments the bonding function by using wall parts as containment structures that guide and limit the spread of bonding material. The bonding material is applied between the first and second wall parts, which prevent it from protruding beyond the intended bonding region while still allowing sufficient material for strong bonding.
Solution Approach 2:
The wall parts provide localized containment properties where needed - they are positioned at the boundaries of the bonding region to prevent bonding material spread in those specific areas, while allowing free bonding material application in the center bonding region. This local quality approach maintains bonding strength without sacrificing position control.
Data Source
AI summary
A display device including a first substrate provided with a plurality of display elements, a second substrate provided facing the display element, a bonding material bonding the first substrate and second substrate, a first wall part provided over the second substrate side of the first substrate and enclosing a display region facing a position of the display element, a second wall part provided over the first substrate side of the second substrate and enclosing a structure body facing a position of the display element and a display region, the first wall part comprises the same material as at least part of the material constituting the display element, the second wall part is provided from the same material as at least part of the material constituting the structure body, and the first wall part and second wall part are in contact using the bonding material in the display region side.