Metal Light-Shielding Substrate for Brighter Reflective Displays
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Solution Overview
Problem
Existing reflective liquid crystal display (RLCD) technologies face challenges in reducing ambient light interference and improving display brightness due to the large size of light-shielding layers and the use of organic materials, which lead to color shift and reduced transmittance.
Innovation Solution
A light-emitting substrate with a first metal light-shielding layer disposed between the transparent substrate and the wiring layer, and a second metal light-shielding layer between the first layer and the wiring layer, configured to interfere destructively with ambient light, made of molybdenum oxide or molybdenum niobium oxide, with specific thickness and positioning to minimize interference and enhance transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If organic light-shielding layers are used to block ambient light, then ambient light interference is reduced, but color shift occurs and transmittance is reduced
Solution Approach 1:
The patent changes the material parameter from organic material to metal oxide (molybdenum oxide or molybdenum niobium oxide), which fundamentally alters the light interaction properties. This material substitution eliminates color shift while maintaining ambient light shielding capability, and the controlled thickness (400-500 Å for first layer, 100-500 Å for second layer) optimizes transmittance while preserving brightness enhancement
Solution Approach 2:
The patent employs a composite structure with two distinct metal oxide layers having different thickness ranges and optical properties. The first metal light-shielding layer (400-500 Å) and second metal light-shielding layer (100-500 Å) work synergistically to provide comprehensive ambient light rejection while maintaining high transmittance for display brightness, avoiding the color shift issues of single-layer organic coatings
2Object-affected harmful factors
If large size light-shielding layers are used to block ambient light, then ambient light interference is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by positioning light-shielding layers specifically at critical interfaces: the first metal light-shielding layer is disposed between the transparent substrate and wiring layer, and the second metal light-shielding layer is disposed between the first light-shielding layer and the wiring layer. This localized approach provides effective ambient light blocking only where needed, reducing overall structural complexity compared to full-coverage large size light-shielding layers
3Illumination intensity
If metal oxide light-shielding layers with specific thickness are used, then transmittance is enhanced, but ambient light shielding capability may be reduced
Solution Approach 1:
The patent segments the light-shielding function into two distinct layers with different thickness optimizations: the first metal light-shielding layer (400-500 Å) provides primary ambient light blocking, while the second metal light-shielding layer (100-500 Å) provides additional shielding with enhanced transmittance characteristics. This segmentation allows each layer to be independently optimized for its specific function, achieving both bright display and effective ambient light rejection
Solution Approach 2:
The patent addresses the thickness-capability tradeoff by adding a dimensional layer: instead of relying on a single thick layer that would block too much light, the solution introduces a second, thinner layer positioned at a different depth. This multi-layer dimensional approach provides cumulative shielding effect while maintaining high transmittance for display brightness
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 effectively reduces ambient light interference, improves display brightness, and simplifies the manufacturing process by eliminating the need for organic light-shielding layers, thereby enhancing the overall display performance and efficiency.
Implementation Method 1
The second metal light-shielding layer and the first metal light-shielding layer are configured in such way that at least part of ambient light reflected by a surface of the second metal light-shielding layer proximate to the transparent substrate and at least part of ambient light reflected by a surface of the first metal light-shielding layer proximate to the transparent substrate are capable of interfering destructively with each other
Data Source
AI summary
A light-emitting substrate includes a transparent substrate; a first metal light-shielding layer, a wiring layer and light-emitting devices. The first metal light-shielding layer is disposed on the transparent substrate. The wiring layer is disposed on a side of the first metal light-shielding layer away from the transparent substrate, and the wiring layer includes circuit traces and pads. Orthographic projections of the circuit traces and the pads on the transparent substrate are all located within an orthographic projection of the first metal light-shielding layer on the transparent substrate. The light-emitting devices are disposed on a side of the wiring layer away from the transparent substrate, and electrically connected to some of the pads; and orthographic projections of the light-emitting devices on the transparent substrate are located within the orthographic projection of the first metal light-shielding layer on the transparent substrate.