Display Device Side Bonding Reduces Bezel Area
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Solution Overview
Problem
Existing display devices face issues with increased bezel area and step differences due to the connection structure of panel drivers and electrostatic discharge, which affect aesthetic appeal and display quality, especially in video wall displays where a reduced bezel is crucial for smooth image display.
Innovation Solution
A display device structure where the panel driver is connected to the side of the display panel using a flexible circuit film and connection electrodes, with a multi-layer signal pad design and side bonding contact structure, and an electrostatic discharge layer integrated on the substrate, reducing the bezel area and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible circuit film is attached to the upper surface of the signal pad, then the panel driver can be connected to the display panel, but the bezel area is increased and step differences occur
Solution Approach 1:
The patent transitions the connection structure from a planar attachment (flexible circuit film on upper surface of signal pad) to a three-dimensional side bonding configuration (connection electrode on the side of the signal pad). This dimensional change allows the flexible circuit film to connect to the signal pad through the side surface, eliminating the need for additional bezel area while maintaining reliable electrical connection.
2Reliability
If the upper substrate is electrically connected with the lower substrate using connection electrode and COF, then electrostatic discharge can be achieved, but the bezel area is increased and manufacturing complexity is increased
Solution Approach 1:
The patent combines the connection electrode function and electrostatic discharge electrode function into a single integrated structure. The connection electrode on the side of the signal pad serves dual purposes: providing electrical connection for the flexible circuit film and serving as the electrostatic discharge path to the case top, thereby eliminating the need for separate electrostatic discharge structures and reducing manufacturing complexity.
Solution Approach 2:
The connection electrode structure is designed to perform multiple functions simultaneously: it provides electrical connection between substrates, enables electrostatic discharge to the case top, and maintains a compact form factor. This multi-functional design reduces the number of separate components needed and simplifies the overall manufacturing process.
3Ease of manufacture
If the signal pad is exposed on the extended lower substrate, then the flexible circuit film can be attached, but the bezel area is increased affecting aesthetic sense
Solution Approach 1:
The patent moves the attachment interface from the upper surface (two-dimensional plane) to the side surface of the signal pad (three-dimensional configuration). This allows the flexible circuit film to be attached vertically along the side of the signal pad, keeping the attachment structure within the existing bezel boundaries and eliminating the need for additional exposed areas that would affect aesthetics.
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A~4B
AI summary
A structure of connecting a panel driver to a side of a display panel and an electrostatic discharge (ESD) structure are disclosed. The display device comprises an active area where an image is displayed and a pad area where a plurality of pads are arranged, and a first substrate and a second substrate are bonded to face each other. A signal pad is arranged on the first substrate, and a connection electrode is arranged at one side of the signal pad. A flexible circuit film connected with the connection electrode is arranged. In this case, the signal pad includes a plurality of lines arranged by interposing an insulating film therebetween, wherein the plurality of lines are electrically connected with each other.