Side Surface Electrode Connection Pad for Display Bezel Reduction
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Solution Overview
Problem
Current display devices face challenges in reducing bezel width, which limits the expansion of the display area and affects the overall design and functionality of devices like smartphones and tablets.
Innovation Solution
The implementation of a display device design featuring a side surface electrode and a flexible film with a connection pad structure that includes multiple electrode layers of varying rigidity, allowing for a concave-convex structure that enhances electrical coupling through ultrasonic bonding, thereby reducing bezel width and increasing display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the flexible film is disposed at a side surface of the display panel to reduce bezel width, then the display area is expanded, but the bonding strength and electrical connection reliability between the flexible film and display panel deteriorate
Solution Approach 1:
The connection pad structure transitions from a conventional planar configuration to a three-dimensional concave-convex structure. The side surface electrode is formed on the side surface of the display panel, and the connection pad includes a lower electrode layer and an upper electrode layer that extend in the thickness direction, creating a multi-dimensional bonding interface that enhances both bonding strength and electrical connection reliability while enabling the flexible film to be disposed at the side surface.
Solution Approach 2:
The connection pad employs a composite structure with multiple electrode layers (lower electrode layer and upper electrode layer) made of different materials with varying rigidities. The lower electrode layer has higher rigidity than the upper electrode layer, creating a concave-convex structure that improves bonding performance. This composite material approach allows the structure to simultaneously achieve mechanical strength for bonding and electrical conductivity for signal transmission.
2Ease of manufacture
If a single-layer electrode structure is used for the connection pad, then the manufacturing process is simplified, but the bonding force and electrical connection quality are insufficient
Solution Approach 1:
The connection pad is segmented into multiple electrode layers: a lower electrode layer and an upper electrode layer. Each layer serves specific functions - the lower electrode layer provides mechanical support and bonding strength, while the upper electrode layer ensures electrical connection. This segmentation allows the structure to achieve both strong bonding and reliable electrical connection, overcoming the limitations of a single-layer structure.
3Ease of manufacture
If electrode layers with the same rigidity are used in the connection pad, then the manufacturing process is simplified, but the concave-convex structure required for enhanced bonding cannot be formed
Solution Approach 1:
The electrode layers are designed with spatially varying properties - the lower electrode layer has higher rigidity than the upper electrode layer. This local quality differentiation creates the concave-convex structure during the bonding process, where the more rigid lower layer maintains its shape while the less rigid upper layer deforms to form the convex portions. This local property variation enables precise control of the bonding interface geometry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively decreases the bezel width, allowing for a larger display area by improving the bonding force and electrical connection between the display panel and the flexible film, thus enhancing the device's design and user experience.
Implementation Method 1
the pads may be connected to the connection pads by an ultrasonic bonding method without using the anisotropic conductive film
Data Source
AI summary
A display device including a display panel, a side surface electrode, and a flexible film. The display panel includes a display area, a non-display area defined outside the display area, a pixel disposed in the display area, a signal line connected to the pixel, and a connection pad extending from the signal line and disposed in the non-display area. The side surface electrode is disposed on one side surface of the display panel and contacts one side surface of the connection pad. The flexible film includes a driving pad that contacts the side surface electrode. The connection pad includes a first electrode layer including a plurality of first electrodes and a second electrode layer disposed on the first electrode layer and including a plurality of second electrodes. The first electrode layer and the second electrode layer have different rigidities.