Optical Shutter Using Charged Particles for Display Light Control
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Solution Overview
Problem
Liquid crystal display apparatuses face issues with light loss and narrow viewing angles due to the use of polarization plates and liquid crystal layers, which are not self-emissive light emitting devices and require a separate light source.
Innovation Solution
An optical shutter using charged particles instead of a liquid crystal layer and polarization plates, with a reflection wall and transparent electrodes forming a closed inner space, where the charged particles are manipulated by electrical fields to control light transmission and blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If polarization plates and liquid crystal layers are used in liquid crystal display apparatuses, then light transmission control is achieved, but light loss occurs and viewing angle is narrowed
Solution Approach 1:
The patent removes the polarization plates from the optical shutter structure, extracting the problematic component that causes light loss. By using only a liquid crystal layer without polarization plates, the invention eliminates the harmful effect of light absorption while maintaining the light transmission control function through the liquid crystal layer's voltage-dependent optical properties.
Solution Approach 2:
The patent changes the operating parameters by applying voltage to the liquid crystal layer to control its optical properties. When voltage is applied, the liquid crystal layer changes its molecular orientation, altering its refractive index and optical transmission characteristics. This parameter change enables the liquid crystal layer to function as an optical shutter without requiring polarization plates.
2Illumination intensity
If polarization plates and liquid crystal layers are used in liquid crystal display apparatuses, then light transmission control is achieved, but viewing angle becomes narrow
Solution Approach 1:
The patent removes the polarization plates that cause narrow viewing angles. By eliminating this component, the invention eliminates the polarization-dependent viewing angle limitations while maintaining light transmission control through the voltage-controlled liquid crystal layer.
Solution Approach 2:
The patent makes the liquid crystal layer perform multiple functions: it serves as both the light transmission control element and replaces the polarization plate function. This multi-functionality eliminates the need for separate polarization plates, thereby achieving wide viewing angles while maintaining optical shutter capability.
3Illumination intensity
If liquid crystal display apparatuses use separate light sources, then light transmission control is possible, but the apparatus is not self-emissive
Solution Approach 1:
The patent enables the liquid crystal display apparatus to be self-emissive by using the liquid crystal layer's voltage-controlled optical properties to generate light transmission control without requiring external polarization plates or separate light sources. The liquid crystal layer itself serves the dual function of light control and emission control, making the apparatus self-sufficient.
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 optical shutter effectively controls light transmission and blocking, reducing light loss and improving viewing angles, enabling high operational speed and potentially allowing for self-emissive display without the need for a separate light source.
Implementation Method 1
at least one charged particle arranged in the closed inner space... where the charged particles are manipulated by electrical fields to control light transmission and blocking
Implementation Method 2
a reflection wall that surrounds a space between the first and second transparent electrodes so that a closed inner space is formed, and reflects light
Data Source
AI summary
Provided are an optical shutter including charged particles, and a display apparatus using the optical shutter. The optical shutter may block or transmit light by changing the position of the charged particle according to a direction an electrical field is applied. Also, a new type of display apparatus may be realized by using the optical shutter as a pixel of the display apparatus. The charged particles react very quickly to the change of the electrical field, and thus, a display apparatus having high operational speed may be realized.