Touchscreen Shielding Film for Foldable Display Crack Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touchscreen integrated display devices face issues with visibility of routing lines and pads outside the active area, as well as crack propagation and defects when folded or returned to their original state, due to the inflexibility of these components.
Innovation Solution
A touchscreen integrated display device configuration featuring a transparent organic film with a shielding film surrounding its periphery, a first adhesive layer between the display panel and touchscreen, and a polarizing plate, which reduces visibility of routing lines and pads, and prevents crack propagation by ensuring the shielding film and polarizing plate are in the same plane, allowing for even adhesion and improved flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If routing lines and pads are disposed outside the active region, then touch detection function is provided, but lines become visible based on viewing angle
Solution Approach 1:
A shielding film is introduced as an intermediary component between the routing lines/pads and the external environment. This shielding film selectively blocks light from reaching the routing lines and pads located in the dead area, preventing their visibility from the front while allowing the touch detection function to operate normally in the active region.
Solution Approach 2:
The routing lines and pads are positioned in the dead area (peripheral region) rather than the active region, utilizing the spatial dimension outside the main display area. This dimensional relocation allows the routing infrastructure to exist without interfering with the primary display function, while the shielding film addresses the visibility issue.
2Adaptability or versatility
If display device is made flexible for folding, then non-display area is reduced, but crack propagation occurs during folding
Solution Approach 1:
The shielding film acts as a cushioning layer that is applied beforehand to the flexible display structure. This film provides mechanical protection and stress distribution during folding operations, preventing crack initiation and propagation in the routing lines and pads before damage can occur to the critical display components.
Solution Approach 2:
The flexible display device employs a composite structure combining multiple materials with different mechanical properties - the shielding film, flexible substrate, and display layers work together as a composite system. This composite construction provides both the flexibility needed for folding and the crack resistance required for reliability.
3Object-affected harmful factors
If shielding film is provided to hide routing lines, then visibility is improved, but adhesion uniformity deteriorates due to plane misalignment
Solution Approach 1:
The shielding film is merged with the flexible display structure such that it lies in the same plane as the display panel. This integration ensures uniform adhesion across the entire surface, eliminating the plane misalignment problem that would otherwise cause adhesion defects and manufacturing precision issues.
Data Source
AI summary
Provided are a touchscreen integrated display device and a method for manufacturing the same. A touchscreen integrated display device includes: a display panel including: an active area in a center of the active area, and a dead area at a periphery of the active area, a touchscreen including: a transparent organic film corresponding to the active area, and a shielding film surrounding a periphery of the transparent organic film, a first adhesive layer between the display panel and the touchscreen, the first adhesive layer corresponding to the active area, and a polarizing plate on the touchscreen.