Narrow-Bezel Touch Display Module Connector Upwarping Prevention
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Solution Overview
Problem
In narrow-bezel OLED touch display modules, the flexible printed circuit tends to upwarp and separate from the touch sensor when bent, leading to a decline in yield due to inadequate connection stability.
Innovation Solution
A touch display module design featuring a polarizer with a concave edge and a protruding adhesion layer that covers the connector of the flexible printed circuit, ensuring secure lapping and preventing upwarping, along with a transparent optical clear adhesive structure for enhanced stability and connection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the flexible printed circuit is bent to reduce bezel area, then the bezel area is reduced, but the connector is easy to upwarp and separate from the touch sensor
Solution Approach 1:
The adhesion layer acts as an intermediary between the connector and the polarizer, providing additional bonding surface area and mechanical support. This intermediary layer prevents the connector from upwarping when the flexible printed circuit is bent, thereby maintaining connection stability while enabling narrow bezel design.
Solution Approach 2:
The connector is designed with a lapped structure that extends in the vertical dimension,lapping to the side of the electric connection portion away from the base substrate. This dimensional extension provides additional bonding area and mechanical interlocking, preventing separation during bending while maintaining the narrow bezel profile.
2Area of stationary object
If the flexible printed circuit is bent to achieve narrow bezel, then the bezel becomes narrower, but the yield of the touch display module declines
Solution Approach 1:
The adhesion layer is applied beforehand to the polarizer in the slotted region, creating a cushioning effect that prevents connector upwarping before it can cause separation. This preventive measure ensures reliable connection during bending, thereby maintaining high yield while achieving narrow bezel design.
Solution Approach 2:
The adhesion layer is selectively applied in the slotted region of the polarizer, which corresponds to the position of the connector. This localized application provides enhanced bonding precisely where needed, preventing separation at the critical connection point while maintaining overall manufacturing efficiency and yield.
3Reliability
If the connector is lapped to the electric connection portion, then electrical connection is achieved, but the connector is prone to upwarping and separation
Solution Approach 1:
The adhesion layer merges the connector, polarizer, and cover plate into a more integrated structure. By bonding the connector to the polarizer through the adhesion layer, the structure gains combined strength and stability, preventing upwarping and separation while maintaining electrical connection reliability.
Solution Approach 2:
The adhesion layer is extracted from the standard assembly process and specifically applied to the polarizer in the slotted region. This extracted element provides targeted reinforcement to the connector area, stabilizing the connector position without affecting other parts of the display module.
Data Source
AI summary
A touch display module, a display device and a transparent optical adhesive layer structure, the touch display module comprising: a substrate; a touch film, the touch film provided with an electrical connection portion; a polarizer comprising a concave edge and a first edge, wherein extension lines of the concave edge and the first edge enclose to form a slotted area, a projection of the slotted area at least partially overlapping a projection of the electrical connection portion; a flexible circuit board, a connector of the flexible circuit board overlapping at a side of the polarizer; an adhesive layer comprising a first protrusion portion beyond an edge of the polarizer, and the first projection portion covering at least a partial region of the connector.