Low-Reflectivity Lower Electrode for High-Contrast LCDs
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Solution Overview
Problem
Conventional cholesteric liquid crystal display devices suffer from poor dark-state performance and optical contrast due to unintended reflected light at the interface between the lower electrode layer and the substrate, which interferes with the displayed content.
Innovation Solution
Incorporating a lower electrode layer made of a low-reflectivity material, such as dark copper oxide or dark molybdenum oxide, to absorb external light and prevent interface reflection, along with colored optical adhesive layers to further absorb external light, thereby enhancing light absorption and improving optical contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional lower electrode layer is used, then the display device can function normally, but interface reflection occurs at the lower electrode layer-substrate interface, causing poor dark-state performance and optical contrast
Solution Approach 1:
The patent changes the material parameter of the lower electrode layer from conventional high-reflectivity materials to low-reflectivity materials with dark color. This parameter change directly reduces the reflectivity at the lower electrode layer-substrate interface, eliminating the harmful reflection that causes poor dark-state performance while maintaining the electrode's basic functionality.
Solution Approach 2:
The patent converts the harmful reflection effect into a beneficial absorption effect by selecting dark-colored low-reflectivity materials for the lower electrode layer. Instead of reflecting light that degrades display quality, the modified electrode layer absorbs light, transforming the harmful optical interaction into a beneficial one that enhances dark-state performance.
2Object-affected harmful factors
If light-absorbing materials are used for the lower electrode layer, then dark-state performance and optical contrast are improved, but the material selection becomes more restricted
Solution Approach 1:
The patent employs composite material strategies by combining dark-colored low-reflectivity materials with conductive properties in the lower electrode layer. This allows the selection of materials that simultaneously satisfy multiple requirements: light absorption for improved dark-state performance and electrical conductivity for proper display device operation, thus resolving the contradiction between light absorption and material flexibility.
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 maintains conductivity while significantly enhancing dark-state performance and optical contrast by reducing external light interference, thus improving display quality.
Implementation Method 1
the lower electrode layer absorbs a light from outside of the upper substrate, and prevents an interface reflection of the light between the lower electrode layer and the lower substrate
Data Source
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AI summary
A display device includes at least one liquid crystal module. The at least one liquid crystal module includes a lower substrate, a lower electrode layer, a pixel layer, an upper electrode layer, and an upper substrate. The lower substrate has an upper surface and a lower surface opposite to each other. The lower electrode layer is connected to the upper surface of the lower substrate. The pixel layer is connected to the lower electrode layer. The upper electrode layer is connected to the pixel layer. The upper substrate is connected to the upper electrode layer. The lower electrode layer is made of a low-reflectivity material of a dark color, the lower electrode layer absorbs a light from outside of the upper substrate, and prevents an interface reflection of the light between the lower electrode layer and the lower substrate.