OLED Display Panel Side-Surface Routing for Narrow Bezel Layout
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in minimizing the side bezel area without compromising display performance or requiring the bending of the TFT substrate.
Innovation Solution
The organic light emitting display device incorporates a panel assembly with a TFT substrate, a thin film encapsulation layer, and a bottom pad, along with a flexible printed circuit board and connection lines disposed on the side surfaces of the TFT substrate to interconnect upper signal lines and circuit elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If peripheral circuits are disposed inside the display assembly, then display functionality is integrated, but the non-display area increases and the display panel size becomes larger
Solution Approach 1:
The patent moves the peripheral circuits from the planar display plane to the vertical dimension by routing them through connection lines on the side surfaces of the TFT substrate. This allows circuits to be disposed on the lower surface of the substrate, effectively utilizing the third dimension (depth/thickness) rather than consuming additional lateral space, thus reducing the non-display area while maintaining circuit integration.
2Adaptability or versatility
If a flexible board is used to bend the bezel for component disposal, then component integration is achieved, but the bezel area is still reduced and the substrate must be bent
Solution Approach 1:
The patent segments the substrate into distinct functional surfaces: the upper surface for display areas and the lower surface for circuit disposal. By dividing the substrate's functional zones and using connection lines to bridge between surfaces, the design eliminates the need to bend the entire substrate, maintaining structural integrity while achieving component integration.
3Area of stationary object
If connection lines are disposed on side surfaces of the TFT substrate, then bezel area is minimized, but manufacturing complexity increases
Solution Approach 1:
The connection lines are routed along the vertical side surfaces of the TFT substrate, utilizing the depth dimension rather than extending horizontally. This vertical routing approach minimizes the horizontal bezel area while the connection lines can be manufactured using standard thin-film deposition and patterning techniques, maintaining manufacturing feasibility.
Data Source
AI summary
An organic light emitting display device includes a TFT substrate on which a display area is defined, a thin film encapsulation layer disposed on the TFT substrate such that the thin film encapsulation layer covers the display area, and a bottom pad disposed on the lower surface of the TFT substrate, and is configured to displays an image; a flexible printed circuit board mounted on the bottom pad of the panel assembly; and a connection line that is disposed on at least one of the upper, lower, left side, and right side surfaces of the TFT substrate, and interconnects an upper signal line disposed on the top surface of the TFT substrate and the bottom pad disposed on the lower surface of the TFT substrate.