OLED Fan-Out Wiring Layout With Dummy Patterns for Spot Reduction
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Solution Overview
Problem
Organic light emitting display devices experience visual defects due to spots generated by fan-out wirings, particularly in areas where signals are transmitted from a narrower pad area to a wider display area.
Innovation Solution
The device incorporates a lattice-shaped dummy pattern integrated with fan-out wirings, which are electrically connected to power voltage wirings, to minimize the visibility of these spots and reduce wiring resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fan-out wirings are used to transmit signals from pad area to display area, then signal transmission capability is improved, but spots are generated in the display area reducing visual quality
Solution Approach 1:
Dummy patterns are introduced as intermediary elements between the fan-out wirings and the display area. These dummy patterns act as a mediator to shield the visual impact of the wirings while maintaining their electrical function, thus resolving the contradiction between signal transmission capability and visual quality
Solution Approach 2:
The dummy patterns are designed to have optical properties that match or blend with the surrounding display area. By matching the optical characteristics (such as reflectivity or color) of the dummy patterns to the display area, the visual contrast is reduced, making the spots less noticeable and improving overall visual quality
2Loss of energy
If fan-out wirings are used to transmit signals, then wiring resistance increases, but device complexity increases due to additional dummy patterns
Solution Approach 1:
The dummy patterns are merged with the existing wiring structure and manufacturing process. Instead of being separate additional components, they are integrated into the same layer or structure as the fan-out wirings, allowing them to serve dual purposes: reducing wiring resistance and maintaining visual quality without significantly increasing device complexity
Solution Approach 2:
The dummy patterns serve multiple functions simultaneously: they act as shielding elements to reduce the visual impact of fan-out wirings, provide electrical connection paths to reduce wiring resistance, and can serve as structural support. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity
Data Source
AI summary
An organic light emitting display device includes: a substrate including: a display area having a first sub-display area and a second sub-display area at a first side part of the first sub-display area; and a pad area at a second side part different from the first side part of the first sub-display area; a plurality of right signal wirings in the second sub-display area on the substrate; a plurality of right fan-out wirings in the pad area, the first sub-display area, and the second sub-display area on the right signal wirings, the right fan-out wirings each including a bent part; a plurality of dummy patterns in the first and second sub-display areas on the right signal wirings, the dummy patterns being spaced apart from the right fan-out wirings, the dummy patterns having a lattice shape; and a plurality of sub-pixel structures on the dummy patterns.