Polarizer-Free Liquid Crystal Display With Voltage-Controlled Lens Grating
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Solution Overview
Problem
Liquid crystal display devices have poor light transmissivity and transparency due to the use of polarizers, limiting their application in transparent fields as they absorb ambient light, leading to a dramatic decline in transparency and poor display effects.
Innovation Solution
A display device with a liquid crystal layer between array and opposite substrates, featuring a sub-pixel area with electrode structures that apply specific voltages to orient liquid crystal molecules into lenses or gratings, allowing light control without polarizers, thereby enhancing transmittance and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If polarizers are used in liquid crystal display devices, then display function is achieved, but light transmissivity and transparency deteriorate
Solution Approach 1:
The patent removes polarizers from the liquid crystal display device structure. By extracting the polarizer component, the device eliminates light absorption and transparency degradation while maintaining display functionality through alternative liquid crystal optical control mechanisms
Solution Approach 2:
The patent changes the optical control parameters by using voltage-controlled liquid crystal orientation (forming lenses or gratings) instead of polarizer-based light modulation. This parameter change enables high light transmissivity while achieving display function through refractive index modulation
2Loss of information
If polarizers are used to control light, then gray scale display is achieved, but transparency deteriorates dramatically
Solution Approach 1:
The patent replaces the polarizer-based light absorption mechanism with a lens-based optical focusing mechanism. Liquid crystal molecules are oriented to form lenses that focus light onto shading parts, achieving gray scale control through optical concentration rather than light blocking, thereby maintaining transparency
Solution Approach 2:
The patent introduces liquid crystal lenses as intermediary optical elements between the light source and display surface. These lenses mediate light distribution by focusing it onto shading parts, enabling gray scale control without using polarizers that would compromise transparency
3Illumination intensity
If polarizers are used in the display structure, then light modulation is achieved, but light absorption increases
Solution Approach 1:
The patent extracts and removes polarizers from the display structure, eliminating the source of light absorption. Light modulation is achieved instead through voltage-controlled liquid crystal lens formation that redirects light spatially without absorbing it
Solution Approach 2:
The patent applies local quality control by creating spatially varying liquid crystal orientations that form lenses with different focal properties. This enables localized light modulation through refraction and focusing, achieving display contrast without the energy loss associated with polarizer absorption
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 device achieves improved light transmittance and transparent display effects by controlling liquid crystal molecules to form lenses or gratings, adjusting gray scales without polarized light, thus eliminating the need for polarizers and enhancing transparency.
Implementation Method 1
control liquid crystal molecules in the liquid crystal layer to be oriented to form a liquid crystal lens
Implementation Method 2
apply the same voltage to the first type electrode, the second electrode and the third electrode, apply different voltages to the first type electrode and the second type electrode
Data Source
AI summary
A display device and a driving method thereof are disclosed. The display device comprises: an array substrate, an opposite substrate and a liquid crystal layer; the display device includes sub-pixel areas including a shading area and a light-transmitting area; the sub-pixel area includes an electrode structure and a first shading part, and the electrode structure includes: first electrodes, second electrodes and third electrodes; the first electrodes are divided into first type electrodes and second type electrodes; the electrode structure is configured to: apply the same voltage to the first type electrode, the second electrode and the third electrode, apply different voltages to the first type electrode and the second type electrode to control liquid crystal molecules to form a liquid crystal lens; or apply different voltages to the second electrode and the third electrode to control the liquid crystal molecules to form a liquid crystal grating.