Stain Correction Layer Nanocrystals Luminance Uniformity
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Solution Overview
Problem
Liquid crystal displays experience luminance non-uniformity and stain defects due to light loss in polarization and color filter layers, leading to uneven brightness and viewing angle issues.
Innovation Solution
A display device with a stain correction layer containing semiconductor nanocrystals positioned between the liquid crystal layer and the color filter, which compensates for luminance deviations by converting incident light into specific colors and providing uniform illumination across the display area, improving viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light passes through the polarization layer and color filter in a liquid crystal display, then the display can show colors and images, but light is lost leading to non-uniform luminance and stain defects
Solution Approach 1:
A stain correction layer containing semiconductor nanocrystals is introduced as an intermediary component between the liquid crystal layer and the color filter. This layer converts incident light into specific wavelengths that match the absorption characteristics of the color filter, thereby reducing light loss and improving luminance uniformity across the display area.
Solution Approach 2:
The patent utilizes the quantum confinement effect in semiconductor nanocrystals to change the wavelength parameter of incident light. By controlling the size and composition of the nanocrystals, the layer converts broad-spectrum light into narrow-band light at specific wavelengths, optimizing the match with the color filter's transmission characteristics and reducing overall light loss.
2Illumination intensity
If a stain correction layer is added to correct luminance non-uniformity, then luminance uniformity improves, but the device structure becomes more complex
Solution Approach 1:
The stain correction layer performs multiple functions simultaneously: it corrects luminance non-uniformity, improves viewing angle characteristics, and enhances color accuracy by optimizing light transmission to the color filter. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The stain correction layer is constructed using composite materials consisting of semiconductor nanocrystals dispersed in a transparent polymer matrix. This composite structure combines the optical properties of nanocrystals (wavelength conversion) with the structural and optical clarity of the polymer, achieving stain correction while maintaining display quality and limiting structural complexity.
3Ease of manufacture
If the display area has regions with different thin film transistor channel lengths, then manufacturing flexibility increases, but luminance uniformity deteriorates
Solution Approach 1:
The stain correction layer provides localized compensation for luminance variations caused by different thin film transistor channel lengths in different regions of the display. By distributing nanocrystals with specific wavelength conversion properties throughout the layer, the system compensates for regional differences in light transmission, ensuring uniform luminance despite manufacturing variations in transistor characteristics.
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 enhances luminance uniformity and viewing angles by using semiconductor nanocrystals to correct luminance deviations and ensure consistent light emission, addressing the issues of stain defects and non-uniformity in liquid crystal displays.
Implementation Method 1
a first semiconductor nanocrystal converting incident light into red light, and a second semiconductor nanocrystal converting the incident light into green light
Data Source
AI summary
A display device includes: a first substrate including a display area; a thin film transistor positioned on the first substrate; a pixel electrode connected to the thin film transistor; a color filter overlapping the pixel electrode; a second substrate overlapping the first substrate; a liquid crystal layer positioned between the first substrate and the second substrate; and a stain correction layer positioned between the second substrate and the liquid crystal layer and including a semiconductor nanocrystal. The display area includes a first region and a second region excluding the first region. The stain correction layer is positioned in the first region.