Cholesteric Liquid Crystal Transparent Screen Modulation Region
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Solution Overview
Problem
Transparent screens with a cholesteric liquid crystal layer face challenges in maintaining transparency and minimizing the visibility of reflection contours when not displaying images, which affects their ambient display functionality.
Innovation Solution
A transparent screen design featuring a substrate with a cholesteric liquid crystal layer, including uniform and modulation regions, where the reflectance gradually decreases from the uniform region to the modulation region, and the modulation region is surrounded by an imaginary contour line, ensuring a reflectance decrease that minimizes contour recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cholesteric liquid crystal layer is used to reflect front side light in a transparent screen, then the screen can function as an ambient display with transparency, but the contour of the reflection part becomes recognizable when not displaying an image, impairing the ambient property
Solution Approach 1:
The patent applies local quality by creating a modulation region with gradually changing reflectance between the uniform region and the transparent region. This gradient structure ensures that different areas of the screen have different optical properties - the uniform region provides strong reflection for visibility, while the transparent region maintains ambient transparency, and the modulation region smoothly transitions between these states to eliminate contour recognition.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying the reflectance parameter across the screen surface. The modulation region is designed with reflectance values that monotonously decrease from the uniform region side toward the transparent region side, creating a smooth optical transition that prevents abrupt boundaries and contour visibility while maintaining overall transparency.
2Illumination intensity
If the reflectance is uniformly high across the screen, then the reflection is strong and visible, but the transparency and ambient display functionality are compromised
Solution Approach 1:
The patent implements local quality by dividing the screen into distinct functional regions: a uniform region with high reflectance for strong video light reflection, a transparent region with low reflectance for maintaining ambient transparency, and a modulation region with gradient reflectance for smooth transition. This spatial differentiation of optical properties allows the screen to simultaneously achieve strong reflection where needed and high transparency where required.
Solution Approach 2:
The patent applies segmentation by dividing the screen surface into multiple functional zones with different reflectance characteristics. The uniform region, modulation region, and transparent region are segmented to perform different optical functions, allowing the overall screen to balance reflection intensity and transparency according to the specific needs of different areas.
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 design enhances transparency and reduces the visibility of reflection contours, allowing the screen to function effectively as an ambient display by maintaining a high level of transparency and minimizing contour recognition when not displaying images.
Implementation Method 1
transparent screens in which light from the front surface side is reflected, and light from the back surface side is transmitted
Implementation Method 2
a reflective layer that is provided at the apex of the back surface side of the unit shapes and reflects the video light that has been transmitted through the unit shapes
Data Source
AI summary
The present invention provides a transparent screen which is excellent in transparency and in which a reflection part contour at the time of not displaying an image is unlikely to be recognized. An optical sheet of the present invention includes a substrate; and a cholesteric liquid crystal layer on the substrate, in which the entire cholesteric liquid crystal layer is surrounded by an imaginary contour line, the cholesteric liquid crystal layer has a uniform region and a modulation region that is located between the uniform region and at least a part of the imaginary contour line, a shortest distance between the imaginary contour line and the uniform region is 10 mm or longer, and a reflectance of the modulation region monotonously decreases from the uniform region side toward the imaginary contour line side.