Liquid Crystal Display Panel Double-Layer Wiring Light Leakage
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Solution Overview
Problem
Conventional liquid crystal display panels experience light leakage around the edge of the display area due to the double layer structure of metal wires, leading to uneven resistance and capacitance products, which affects display quality and causes issues like band mura.
Innovation Solution
The implementation of a liquid crystal display panel with a double-layer wiring structure where upper-layer and lower-layer main wires are offset, forming a union area that gradually decreases from the center to the peripheral area, maintaining equal impedance and reducing variations in the product of resistance and capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double layer structure of metal wires is used to transmit signals, then the impedance of the metal wires can be kept equal, but transparent areas are easily formed allowing light leakage and the products of resistance and capacitance become significantly different
Solution Approach 1:
The patent applies local quality by making the wire width vary in different regions. Specifically, the wire width in the center region is different from the wire width in the peripheral region, allowing different parts of the same wire structure to have different properties. This enables the wires to maintain equal impedance while preventing light leakage by adjusting the width locally in different areas.
Solution Approach 2:
The patent introduces asymmetry by making the wire widths in the center and peripheral regions different. The first wire width in the center region and the second wire width in the peripheral region are deliberately made asymmetric to compensate for the different light leakage conditions in different areas, thereby maintaining equal impedance products while preventing light leakage.
2Object-affected harmful factors
If the wire width is uniformly reduced to prevent light leakage, then light leakage is reduced, but the impedance product becomes uneven across different regions
Solution Approach 1:
The patent applies local quality by making the wire width vary in different regions. Specifically, the wire width in the center region is different from the wire width in the peripheral region, allowing different parts of the same wire structure to have different properties. This enables the wires to maintain equal impedance while preventing light leakage by adjusting the width locally in different areas.
Solution Approach 2:
The patent changes the parameter of wire width differently in different regions. By setting the first wire width in the center region and the second wire width in the peripheral region to different values, the patent optimizes both light leakage prevention and impedance uniformity through parameter variation across different spatial locations.
3Reliability
If the wire width is increased to maintain impedance, then impedance is maintained, but light leakage increases around the display area edge
Solution Approach 1:
The patent applies local quality by making the wire width vary in different regions. Specifically, the wire width in the center region is different from the wire width in the peripheral region, allowing different parts of the same wire structure to have different properties. This enables the wires to maintain equal impedance while preventing light leakage by adjusting the width locally in different areas.
Solution Approach 2:
The patent changes the parameter of wire width differently in different regions. By setting the first wire width in the center region and the second wire width in the peripheral region to different values, the patent optimizes both light leakage prevention and impedance uniformity through parameter variation across different spatial locations.
Data Source
AI summary
A liquid crystal display panel includes a display area, a wiring area, and an external circuit area, wherein the wiring area is between the display area and the external circuit area. The liquid crystal display panel includes many pixel structures, external pads and wiring sets. Each wiring set includes a plurality of upper-layer main wires disposed on one plane and lower-layer main wires disposed on another plane, wherein the two planes are parallel. In addition, each upper-layer main wire corresponds to one lower-layer main wire and the shadow which the upper-layer main wire vertically projects on the surface overlaps a part of the corresponding lower-layer main wire. The light leakage around the display area can be eliminated by proper arrangement of main wiring sets, and therefore the display quality is improved.