Quantum Dot Layer Placement in LCD Panel for Transmissivity
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Solution Overview
Problem
Existing liquid crystal display panels using quantum dots suffer from reduced transmissivity due to the effects of quantum dots on light polarization and external light excitation, which impairs display performance.
Innovation Solution
A liquid crystal display panel design with a quantum-dot layer positioned between the first polarizer film and the substrate, where light first passes through the quantum-dot layer and then the polarizer films, preventing external light from exciting the quantum dots and maintaining polarization, and incorporating a four-pixel design with red, green, transparent, and white sub-pixels to enhance color performance and transmissivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are incorporated into a color filter to improve color performance, then color saturation and color gamut are improved, but the polarization state of light is altered causing reduced transmittance
Solution Approach 1:
The patent changes the spatial arrangement of quantum dots from a planar color filter layer to a three-dimensional configuration between the backlight and color filter. This dimensional repositioning allows quantum dots to receive excitation light from the backlight while emitting light that passes through the color filter without compromising polarization state, thus resolving the contradiction between color enhancement and light transmission.
Solution Approach 2:
The patent introduces a reflective polarizer as an intermediary component between the quantum dot layer and the color filter. This reflective polarizer maintains the polarization state of light passing through the quantum dots while allowing the quantum dots to be excited by the backlight, thereby preventing the polarization alteration issue that would otherwise reduce light transmittance.
2Productivity
If a blue-light filtering layer is added to improve quantum dot absorption, then color conversion efficiency is improved, but panel transmissivity is greatly decreased
Solution Approach 1:
The patent extracts the blue-light absorption function from a separate filtering layer and integrates it directly into the quantum dot layer itself. The quantum dots are designed to absorb blue light and convert it to other colors, eliminating the need for an additional blue-light filtering layer that would block transmitted light, thus resolving the contradiction between absorption efficiency and panel transmissivity.
3Illumination intensity
If quantum dots are placed in a conventional color filter position, then color performance is improved, but external light can excite quantum dots causing display failure
Solution Approach 1:
The patent applies preliminary anti-action by positioning the quantum dot layer between the backlight and the color filter, creating a configuration where external light cannot reach and excite the quantum dots. This preventive spatial arrangement blocks external light paths to the quantum dots before excitation can occur, thus maintaining display reliability while preserving color performance.
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
This arrangement enhances color display quality, protects the quantum-dot layer from external light, and significantly improves transmissivity and brightness by preventing polarization effects and ensuring the quantum-dot layer is not excited by external light.
Implementation Method 1
Quantum confinement effect can be observed in quantum-dot materials. Specifically, the electrons and electron holes within a quantum dot material can be squeezed into a dimension that approaches a critical quantum measurement, which enables the original continuous energy band to become discrete energy levels, whereby the material can emit visible light in response to an external excitation.
Implementation Method 2
Backlight or natural light becomes linearly polarized light after passing through a polarizer.
Data Source
AI summary
Disclosed is a liquid crystal display panel and a liquid crystal display device. The liquid crystal display panel comprises a first substrate and a second substrate which are disposed opposite to each other. The first substrate is provided, on a side thereof facing the second substrate, with a first polarizer film. The second substrate is provided thereon with a second polarizer film. A quantum-dot layer is provided between the first polarizer film and the first substrate, so that light can first pass through the quantum-dot layer and excite the quantum-dot layer, then enter the first polarizer film, and finally shine out through the second polarizer film. The liquid crystal display panel provided by the present disclosure will exhibit better display effect and have a higher transmissivity.