Light Emitting Drive Substrate with Equal Resistance Power Wires
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving high contrast ratio, brightness uniformity, and screen-to-body ratio due to the complexity of the backlight module's drive circuit and the inhomogeneous brightness caused by unequal voltage drop across power supply wires.
Innovation Solution
A light emitting drive substrate with a design where the resistance between the ends of the power supply wires is equal, allowing for uniform voltage distribution across subregions, reducing the need for different compensation voltages and simplifying the drive circuit, while also decreasing the wire load and area, thereby increasing efficiency and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If power supply wires of equal length are used for different light-emitting subregions, then the wire layout is simple, but the voltage drop is unequal causing inhomogeneous brightness
Solution Approach 1:
The patent applies local quality by making the wire widths different for different power supply wires while keeping lengths equal. Specifically, power supply wires are designed with widths of 5-15 micrometers, where the width is inversely proportional to the distance from the periphery area. This creates local variations in wire properties (width) to compensate for the equal length design, ensuring equal resistance and uniform voltage distribution across different light-emitting subregions, thereby achieving homogeneous brightness without increasing drive circuit complexity
Solution Approach 2:
The patent changes the physical parameter of wire width to achieve equal resistance. By adjusting the wire width parameter (from 5-15 micrometers range) based on the distance from the periphery area, the resistance of each power supply wire is equalized despite having equal lengths. This parameter change approach allows uniform voltage distribution and brightness uniformity while maintaining the simplicity of equal-length wire layout
2Illumination intensity
If different compensation voltages are applied to different power supply wires, then brightness uniformity is improved, but the drive circuit complexity increases
Solution Approach 1:
The patent applies homogeneity by designing all power supply wires to have equal resistance through equal lengths and carefully controlled widths. This homogeneous resistance property allows all light-emitting subregions to receive equal voltage without requiring different compensation voltages. The result is uniform brightness across the display while maintaining simple drive circuit operation, as the same voltage can be applied to all power supply wires
3Reliability
If wire widths are increased to reduce resistance, then voltage distribution improves, but the wire area and manufacturing complexity increase
Solution Approach 1:
The patent applies local quality by varying wire widths locally based on position. Wires closer to the periphery area have larger widths (up to 15 micrometers) while wires farther away have smaller widths (down to 5 micrometers). This local variation optimizes resistance distribution without requiring uniformly large wire widths, thus reducing total wire area while maintaining reliable voltage distribution uniformity across all light-emitting subregions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances light-emitting homogeneity, reduces the complexity and size of the drive circuit, decreases costs, and improves the display quality by maintaining uniform brightness across the display device, thus addressing the issues of contrast ratio and screen-to-body ratio.
Implementation Method 1
a resistance between the first end of the first power supply wire and the second end of the first power supply wire is equal to a resistance between the first end of the second power supply wire and the second end of the second power supply wire
Data Source
AI summary
A light emitting drive substrate, a manufacturing method of the light emitting drive substrate, a light emitting substrate and a display device. The light emitting drive substrate includes a first light-emitting subregion, a second light-emitting subregion, a periphery area, a first power supply wire and a second power supply wire. A resistance between the first end and the second end of the first power supply wire is equal to a resistance between the first end and the second end of the second power supply wire, and a wire length between the first end and the second end of the first power supply wire is not equal to a wire length between the first end and the second end of the second power supply wire.