Inclined Display Panel Edge for Reliable Pad Connections
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Solution Overview
Problem
Existing display panels face issues with pixel failure due to unreliable electrical connections between external electronic components and the display panel, particularly at the pad region where signal and dummy pads are connected.
Innovation Solution
The display panel incorporates a base substrate with insulating layers and signal/dummy pads, where the insulating layer covers the pads and defines an inclined edge, with specific openings and patterns to enhance electrical connectivity and prevent lumping of conductive balls, thereby minimizing the risk of pixel failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the end surfaces of base substrate and insulating layer are aligned flatly, then manufacturing simplicity is improved, but pixel failure risk increases due to unreliable connections
Solution Approach 1:
The invention transitions from a two-dimensional flat alignment problem to a three-dimensional stepped structure. By creating different height levels (steps) at the end surfaces of the base substrate and insulating layer, the patent enables the inclined edge configuration that improves connection reliability while maintaining manufacturing feasibility through controlled deposition processes.
2Reliability
If the inclined edge configuration is implemented, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The complex inclined edge structure is segmented into manageable components: the base substrate end surface, the first insulating layer end surface, the second insulating layer end surface, and the third insulating layer end surface. Each segment serves a specific function and can be manufactured and controlled independently, reducing overall device complexity while maintaining connection reliability.
Data Source
AI summary
A display device includes a base substrate including: a display region including a pixel, and a pad region defining an end surface of the base substrate which is furthest from the display region and exposed outside the display panel; an insulating layer in the display region and the pad region; and in the pad region: a signal pad electrically connected to the pixel and to a dummy pad; the insulating layer covering the signal pad and the dummy pad and defining an end surface of the insulating layer which is furthest from the display region and exposed outside the display panel; and a first opening in the insulating layer which exposes the signal pad outside the insulating layer and outside the display panel. In the pad region, the end surfaces of the base substrate and the insulating layer together define an inclined edge of the display panel.