Display Side Polarizer with Quantum Dot Diffraction Layer
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) suffer from color washout, gray-scale inversion, and low contrast at wide viewing angles due to inconsistent light projection from liquid crystal molecules, and existing solutions like wide viewing angle films, diffusion films, and quantum dot materials face challenges in controlling light direction and polarization, leading to reduced image quality.
Innovation Solution
A display side polarizer integrated with a quantum dot diffraction layer and a diffraction microstructure layer, which includes a quantum dot planarization layer and a light collimation layer, effectively manages light direction and polarization to enhance color gamut and reduce color shift, utilizing quantum dots to convert light and a diffraction microstructure to direct light at specific angles, mimicking self-luminous displays like OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide viewing angle film is disposed on the display side polarizer and backlight side polarizer to equalize images between central and wide viewing angles, then the viewing angle performance is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple functions into a single integrated structure: the display side polarizer incorporates both the polarizing function and the wide viewing angle correction function through the integrated diffraction structure layer and quantum dot layer, eliminating the need for separate wide viewing angle films and reducing overall device complexity
Solution Approach 2:
The display side polarizer serves multiple functions simultaneously: it polarizes light, corrects viewing angle issues through diffraction, and provides color conversion through quantum dots, making the component universal and reducing the total number of layers needed in the display structure
2Illumination intensity
If a diffusion film is attached on the surface of the display side polarizer to increase light intensity and contrast at wide viewing angles, then the light scattering is improved, but the image saturation and contrast are reduced due to whitening effect
Solution Approach 1:
The patent replaces the mechanical diffusion film approach with an optical diffraction mechanism. The diffraction structure layer uses precise microstructures to control light direction through diffraction physics, substituting the粗放 scattering mechanism of diffusion films with a more precise optical control method that avoids whitening effects
Solution Approach 2:
The patent changes the physical parameters of light control by using diffraction angles determined by microstructure geometry rather than random scattering. This parameter change allows precise control of light direction while maintaining image quality, avoiding the trade-off between light intensity and saturation
3Ease of manufacture
If quantum dot material is added to the diffusion plate or color filter to increase color saturation and color gamut, then the color performance is improved, but the polarization degree is depolarized by scattering and light intensity is decreased
Solution Approach 1:
The patent extracts the quantum dot material from its traditional position within the liquid crystal module (diffusion plate or color filter) and places it on the display side polarizer. This extraction removes the scattering issue caused by quantum dots being embedded in the light path, while preserving their color conversion benefits
Solution Approach 2:
The patent introduces the diffraction structure layer as an intermediary between the quantum dot layer and the viewer. This intermediary controls the direction of light through diffraction, ensuring that polarized light maintains its polarization state while still achieving wide viewing angle coverage and color conversion
4Ease of manufacture
If the content of quantum dot material in the color filter is increased to obtain sufficient color saturation, then the color gamut is improved, but the polarization degree is depolarized by scattering and light intensity passing through the display side polarizer is decreased
Solution Approach 1:
The patent extracts quantum dot material from the color filter assembly and relocates it to the display side polarizer structure. This separation allows the color filter to maintain its polarization function while the quantum dots provide color conversion without causing depolarization, as they are no longer in the direct path of polarized light
Solution Approach 2:
The patent applies quantum dot material locally on the display side polarizer surface rather than throughout the entire color filter. This localized application ensures that quantum dots are positioned where they can convert light effectively without interfering with the polarization function of the color filter, maintaining both color saturation and polarization degree
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 significantly improves color saturation and contrast at wide viewing angles, reducing color shift and gray-scale inversion, achieving image quality comparable to self-luminous displays by optimizing light direction and polarization, while maintaining high backlight efficiency.
Implementation Method 1
a quantum dot planarization layer which fills and planarizes the diffraction microstructure layer... comprising a quantum dot planarization layer and a light collimation layer
Implementation Method 2
a diffraction microstructure layer disposed on the light collimation layer... utilizing quantum dots to convert light and a diffraction microstructure to direct light at specific angles
Implementation Method 3
a light collimation layer disposed on the light exit surface of the polarizing layer
Data Source
AI summary
A polarizer for the display side of a liquid crystal display is provided. The polarizer comprises a polarizing layer, a light collimation layer and a quantum dot diffraction layer. The polarizing layer has a light incident surface and a light exiting surface. The light collimation layer is disposed on the light exiting surface of the polarizing layer. The quantum dot diffraction layer is disposed on the light collimating layer on the opposite side of the polarizing layer, and comprises a diffraction microstructure layer disposed on the light collimation layer, and a quantum dot planarization layer which fills and planarizes the diffraction microstructure layer and can be divided into a plurality of pixel regions.