Rear Pad Electrode Layout for Narrow-Bezel Display Panels
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Solution Overview
Problem
Existing display devices have a significant non-display area that limits their effectiveness in providing a wide display area while minimizing non-functional areas.
Innovation Solution
A display device design that includes a first and second circuit board, a display panel connected to both circuit boards, and a base layer with connection electrodes and pad electrodes to reduce the non-display area by optimizing the layout and connection of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display area is expanded to provide a wider display, then the user experience is improved, but the non-display area increases which limits the effectiveness
Solution Approach 1:
The patent utilizes the non-display area by extending circuit boards into this region and exposing pad electrodes on the rear surface of the display panel. This transforms the previously wasted non-display area into a functional space for electrical connections, effectively adding utility to an underutilized dimension of the display device structure.
Solution Approach 2:
The rear surface of the display panel, traditionally serving only as a structural backside, is repurposed to host pad electrodes and circuit board connections. This multi-functional use of the rear surface allows it to serve both as a structural element and as an electrical interface area, reducing the need for additional non-functional space.
2Reliability
If pad electrodes are arranged in opposite directions to connect to both circuit boards, then the electrical connectivity is improved, but the layout complexity increases
Solution Approach 1:
The pad electrodes are arranged asymmetrically with first pad electrodes extending in a first direction and second pad electrodes extending in an opposite direction. This asymmetric layout optimizes the electrical connections to different circuit boards while utilizing the available rear surface area efficiently, reducing the need for symmetric but less efficient connection arrangements.
Solution Approach 2:
The electrical connection system is segmented into multiple independent pad electrode groups (first pad electrodes and second pad electrodes) that can be independently routed to different circuit boards. This segmentation allows for simplified individual connection paths while achieving comprehensive electrical connectivity across the display assembly.
Data Source
AI summary
A display device includes first and second circuit boards connected to a display panel defining a display area and a non-display area, and including a first sub-base layer overlapping the display area and the non-display area, a second sub-base layer above the first sub-base layer, a connection electrode between the first sub-base layer and the second sub-base layer, and electrically connected to a signal line, and pad electrodes exposed through an opening in the first sub-base layer, electrically connected to the connection electrode, and including first pad electrodes electrically connected to the first circuit board, and extending in a direction, and second pad electrodes electrically connected to the second circuit board, spaced apart from the first pad electrodes in the direction, and extending in an opposite direction, and a circuit layer including a transistor, and at least one signal line connected to the transistor.