Rear Inspection Pad Layout for Narrow-Bezel Multi-Display Panels
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Solution Overview
Problem
Existing display devices with inspection pads on their periphery face challenges in reducing frame size and achieving uniform pixel pitch, leading to discomfort and image quality issues in multi-display setups, as well as risks of damage during inspection.
Innovation Solution
The display device features inspection pads positioned on non-display surfaces with central portions not overlapping wires, allowing for reduced frame size, uniform pixel pitch, and safer inspection processes by preventing contact with electrode pads and wiring conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inspection pads are positioned on the periphery of the display device, then inspection can be performed, but the frame size increases and pixel pitch uniformity deteriorates
Solution Approach 1:
The inspection pad is repositioned from the peripheral region to the non-display surface (rear surface) of the substrate, utilizing a different spatial dimension. This allows the inspection function to be maintained while eliminating the need for enlarged frame portions, thereby preserving pixel pitch uniformity in multi-display configurations.
Solution Approach 2:
Instead of placing the inspection pad on the front/display surface or periphery as conventionally done, the inspection pad is inverted to the opposite side - the non-display surface. This inversion resolves the conflict between inspection accessibility and frame size reduction.
2Ease of operation
If inspection pads are positioned near electrode pads and wiring conductors, then inspection can be performed, but the risk of component damage during inspection increases
Solution Approach 1:
The inspection pad is extracted from the problematic peripheral region where it would be near electrode pads and wiring conductors, and repositioned to the non-display surface. This separation eliminates the risk of inspection members damaging sensitive components while maintaining inspection functionality.
Solution Approach 2:
The non-display surface acts as an intermediary space that allows inspection pad placement away from sensitive components. By using this intermediate region, the inspection function can be performed without direct proximity to electrode pads and wiring conductors, reducing damage risk.
3Shape
If frame size is reduced for better pixel pitch uniformity, then multi-display image quality improves, but inspection pad placement becomes difficult
Solution Approach 1:
The inspection pad is moved to the non-display surface, utilizing the third dimension (depth/thickness) of the substrate rather than consuming lateral space. This allows frame size to be minimized for better pixel pitch uniformity while inspection accessibility is maintained through the rear surface.
Data Source
AI summary
A display device includes a substrate including a first surface, a side surface, and a second surface opposite to the first surface, a display on the first surface, an electrode pad on the second surface and electrically connected to the display, an external connection terminal on the second surface, a first wire on the second surface and electrically connecting the electrode pad and the external connection terminal, and an inspection pad on the second surface and electrically connected to the electrode pad. At least a central portion of the inspection pad does not overlap the first wire.