Polarizer Notch Design for Flexible OLED Bubble Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the module process of flexible OLED panels, the bonding area of a polarizer can create an inclined slope when attached to a touch sensor, leading to bubble formation and light leakage due to height differences, which worsens with environmental changes in pressure, temperature, and humidity.
Innovation Solution
A polarizer design with a notch in the peripheral area allows the circuit board to be placed on a side away from the view area, preventing bubble formation and light leakage by isolating the circuit board from the view area and allowing for a raised area with pressure-sensitive adhesive for secure attachment without additional adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the polarizer is attached to the touch sensor without a notch, then the bonding area provides structural support, but an inclined slope forms causing bubble formation and light leakage
Solution Approach 1:
The polarizer is segmented by introducing a notch that divides the bonding area into distinct regions: a first bonding area for attaching to the touch sensor and a second bonding area for attaching to the circuit board. This segmentation prevents the formation of an inclined slope across the entire bonding area, eliminating the height difference that causes bubbles and light leakage while maintaining attachment stability through distributed bonding regions.
Solution Approach 2:
Different regions of the polarizer are given different functional qualities through the notch design. The first bonding area is optimized for touch sensor attachment, the notch region provides a transition zone that prevents inclined slope formation, and the second bonding area is optimized for circuit board attachment. This local differentiation of bonding characteristics eliminates the harmful inclined slope while maintaining overall attachment reliability.
2Reliability
If the circuit board is placed directly on the bonding area, then electrical connection is achieved, but height difference causes bubbles and light leakage
Solution Approach 1:
The bonding area is segmented into a first bonding area for touch sensor attachment and a second bonding area for circuit board attachment, separated by the notch. This segmentation ensures that the circuit board attaches to a dedicated region at the same height level as the touch sensor interface, eliminating height differences that cause bubbles while maintaining reliable electrical connection through the second bonding area.
3Strength
If additional adhesives are used to secure the circuit board, then attachment strength is improved, but material and process costs increase
Solution Approach 1:
The polarizer's bonding area is designed to serve multiple functions: the first bonding area attaches to the touch sensor, the notch prevents inclined slope formation, and the second bonding area attaches to the circuit board. This multi-functional design eliminates the need for additional adhesives while maintaining attachment strength, as the polarizer itself provides all necessary bonding surfaces through its structured design.
Solution Approach 2:
The polarizer structure itself provides the attachment function for both the touch sensor and circuit board through its bonding areas and notch configuration. The polarizer serves its own attachment needs without requiring external adhesives, eliminating material costs and simplifying the manufacturing process while maintaining attachment strength.
Data Source
AI summary
A polarizer, a display panel and a display device are disclosed. The polarizer includes a view area (VA) and a peripheral area. A notch is disposed in the peripheral area. A side of the notch away from the view area is configured to place a circuit board.