Transparent Display Using Cholesteric Liquid Crystal Layers
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Solution Overview
Problem
Existing transparent displays with sheet polarizers and light guide plates suffer from low light transmittance, limiting their transparency performance.
Innovation Solution
A transparent display design that employs a light source, a first liquid crystal layer for transmitting and reflecting light, and a second liquid crystal layer in an image display device, utilizing cholesteric-phase liquid crystals to manage light transmission and reflection without the need for sheet polarizers or light guide plates, allowing for improved light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If sheet polarizers and light guide plates are employed in transparent display, then display function is achieved, but light transmittance is reduced
Solution Approach 1:
The patent removes the sheet polarizer and light guide plate components from the traditional transparent display structure. By extracting these elements, the system achieves higher light transmittance while maintaining display functionality through alternative liquid crystal layer configurations that directly control light transmission without requiring these intermediate optical components.
Solution Approach 2:
The liquid crystal layers in the patent serve multiple functions simultaneously: they act as both the display medium and the light control element. The cholesteric liquid crystal layers provide both structural support and optical control, eliminating the need for separate specialized components like sheet polarizers and light guide plates, thus simplifying the overall structure while improving light transmission.
2Illumination intensity
If sheet polarizers and light guide plates are used, then display control is achieved, but transparency performance deteriorates
Solution Approach 1:
The patent utilizes cholesteric liquid crystals with specific screw pitches to control light transmission. By changing the structural parameters of the liquid crystal molecules (screw pitch configuration), the system achieves reliable display control while maintaining high transparency. The cholesteric phase transition and screw pitch characteristics enable precise control over light transmission without compromising either transparency or display reliability.
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 enables a transparent display with enhanced light transmittance, allowing for better visibility of background images when no voltage is applied and clear image display when voltage is applied, without the use of sheet polarizers or light guide plates.
Implementation Method 1
a cholesteric-phase liquid crystal with a first screw pitch is formed on the first liquid crystal layer and the second liquid crystal layer, respectively
Implementation Method 2
the first liquid crystal layer, for transmitting a first part of the light emitted from the light source and reflecting a second part of the light emitted from the light source
Implementation Method 3
the first part of the light is transmitted through the second liquid crystal layer
Data Source
AI summary
The present invention provides a transparent display which comprises a light source; a first liquid crystal layer, for transmitting a first part of the light emitted from the light source and reflecting a second part of the light emitted from the light source; a light-transmittable image display device including a second liquid crystal layer, wherein the first part of the light is emitted to the second liquid crystal layer, when the image display device is in a first state, the first part of the light is transmitted through the second liquid crystal layer, and the image display device displays an image; when the image display device is in a second state, the first part of the light is reflected by the second liquid crystal layer, and the image display device becomes transparent. The transparent display according to the present invention can realize the function of a transparent display without use of a sheet polarizer or a light guide plate. Therefore, in comparison with the transparent display of the prior art, the transparent display according to the present invention has greatly-improved light transmittance.