Display Device Connection Pad Bezel Reduction
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Solution Overview
Problem
In tile-type display devices, the bezel size is significant, and there is a risk of contact defects between flexible circuit boards and connection pads, which can interfere with user immersion and device performance.
Innovation Solution
The design incorporates a first and second substrate with a spacer and recess part configuration, where the connecting pad contacts both the side and top surfaces of the connection pad, minimizing bezel size and preventing contact defects by widening the contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bezel size is reduced to improve user immersion, then the contact area between flexible circuit boards and connection pads decreases, but contact defects increase
Solution Approach 1:
The connection pad structure transitions from a two-dimensional planar contact to a three-dimensional configuration by forming a groove that receives the flexible circuit board. This vertical dimension addition allows the connection pad to contact the flexible circuit board at multiple points (top surface and side surface), thereby maintaining reliable contact even when the overall bezel area is reduced.
Solution Approach 2:
The connection pad contact interface is segmented into multiple contact regions: a first contact area on the top surface and a second contact area on the side surface. This segmentation distributes the contact load across multiple points, improving overall contact reliability while allowing the total bezel area to be minimized.
2Area of stationary object
If the bezel size is reduced to improve user immersion, then the space for connection components decreases, but contact defects between flexible circuit boards and connection pads increase
Solution Approach 1:
The groove structure integrates multiple functions into a single component: it serves as both a mechanical support structure and a contact interface for the flexible circuit board. The groove simultaneously provides structural integrity to the reduced bezel area and creates the necessary contact areas, thereby reducing overall device complexity despite the compact design.
3Reliability
If the contact area between flexible circuit boards and connection pads is increased to prevent contact defects, then the bezel size increases, but user immersion is interfered with
Solution Approach 1:
Instead of expanding the contact area in the horizontal plane (which would increase bezel size), the invention utilizes the vertical dimension by creating a groove structure. This allows the flexible circuit board to contact the connection pad at multiple levels (top and side surfaces), achieving reliable contact without increasing the overall bezel footprint.
Data Source
AI summary
A display device including a first substrate; a second substrate facing the first substrate; a connection pad disposed on the first substrate; a first spacer disposed on the connection pad and exposing part of the connection pad; and a connecting pad disposed on side surfaces of the first and second substrates, the connecting pad contacting the connection pad.