Zigzag Data Fan-Out Wiring for Uniform Display Luminance
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Solution Overview
Problem
Existing display devices face issues with non-uniform luminance and dead space due to resistance differences in fan-out wires, leading to defects like open-circuits and short-circuits during fan-out wiring patterning.
Innovation Solution
The display device incorporates zigzag and straight portions in fan-out wires with adjusted widths and lengths, and a photomask with slits to minimize resistance differences and prevent defects, ensuring uniform luminance and reduced dead space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fan-out wires are used to connect data lines to flexible printed circuit boards, then electrical connection is achieved, but resistance differences cause non-uniform luminance and dead space
Solution Approach 1:
The patent applies local quality by making the width of fan-out wires vary at different locations. Specifically, the width of fan-out wires is designed to be wider near the flexible printed circuit board and narrower toward the display panel, which compensates for resistance differences and achieves uniform luminance across the display area.
2Ease of manufacture
If fan-out wires are patterned using conventional photomasks, then wiring structure is formed, but open-circuits and short-circuits occur
Solution Approach 1:
The patent segments the photomask into multiple regions with different slit configurations. The photomask includes first slits for forming fan-out wires and second slits for forming connection wires, with different slit widths and patterns in different regions. This segmentation allows precise control of wire widths and prevents both open-circuits and short-circuits during patterning.
Solution Approach 2:
The patent applies parameter changes by varying the slit width in different regions of the photomask. The first slits have different widths than the second slits, allowing different wire widths to be formed in different regions. This parameter variation prevents defects by ensuring adequate wire width for electrical connection while maintaining proper spacing to avoid short-circuits.
3Reliability
If wire width is increased to reduce resistance, then electrical connection improves, but dead space increases
Solution Approach 1:
The patent applies local quality by making the width of fan-out wires vary at different locations. Specifically, the width of fan-out wires is designed to be wider near the flexible printed circuit board and narrower toward the display panel, which compensates for resistance differences and achieves uniform luminance across the display area.
Data Source
AI summary
A display device includes: a substrate having a display area and a peripheral area; a first wiring layer to transfer a gate signal in the display area; a second wiring layer to transfer a data voltage in the display area; a data fan-out having a first data fan-out wire connected to the second wiring layer; and a data flexible printed circuit board electrically connected to the first data fan-out wire in the peripheral area. The first data fan-out wire includes a first zigzag portion having a zigzag shape and a first straight portion that extends from the first zigzag portion. A width of the first straight portion is larger than a width of the first zigzag portion.