Multi-Screen Display Side Electrode Layout for Narrow Bezels
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Solution Overview
Problem
Conventional display devices using semiconductor light emitting devices face issues with low productivity due to transfer defects and high bezel areas in multi-screen configurations, leading to a sense of disconnection and reduced image immersion.
Innovation Solution
The display device incorporates a design with thicker electrode pads and side electrodes that minimize bezel areas by ensuring adequate contact and reducing thickness, while the manufacturing method simplifies electrical connections between substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bezel area of each unit display device is reduced to improve image immersion in multi-screen display, then the connection area for side electrodes is reduced, leading to increased defect rate in electrical connection between upper and lower substrates
Solution Approach 1:
The side electrode is designed to extend from the upper substrate through the bezel area to the lower substrate, utilizing the vertical dimension to maintain connection reliability while minimizing horizontal bezel area. This three-dimensional electrode configuration allows the connection path to traverse through the reduced bezel space rather than requiring large horizontal area.
Solution Approach 2:
The side electrode is embedded within the bezel area structure, with the electrode pad on the upper substrate nested into the bezel region and the electrode extending downward to connect with the lower substrate. This nesting arrangement allows the connection structure to be contained within the minimized bezel footprint.
2Area of stationary object
If the thickness of the side electrode is reduced to minimize bezel area, then the manufacturing precision requirement increases due to smaller contact area with electrode pads
Solution Approach 1:
The electrode pad on the upper substrate is formed with a thickness greater than that of the side electrode in advance, creating a stepped structure. This preliminary thickness difference ensures that the thicker electrode pad provides a sufficient contact area with the side electrode, compensating for the reduced side electrode thickness and minimizing the impact on manufacturing precision.
Solution Approach 2:
The electrode pad is designed with non-uniform thickness, being thicker at the region where it contacts the side electrode and thinner in other areas. This local quality variation ensures adequate contact area for reliable electrical connection while maintaining overall minimal bezel area.
Data Source
AI summary
A display device according to an embodiment of the present invention includes a first substrate, a plurality of semiconductor light emitting devices disposed in an array form on an upper surface of the first substrate, a first wiring electrode formed on the upper surface of the first substrate and electrically connected to the plurality of semiconductor light emitting devices, a first electrode pad formed in an area including an upper edge of the first substrate and connected to the first wiring electrode and a side electrode formed on a side surface of the first substrate and having one end in contact with a side surface of the first electrode pad. And a thickness of the first electrode pad can be greater than a thickness of the first wiring electrode.