Quantum-Dot Color Filter Stacked Layer for LCD Viewing Angle Correction
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Solution Overview
Problem
Existing liquid crystal display devices experience brightening and color deviation issues during large viewing-angle displays due to light path deviations and polarization changes, particularly when displaying a black screen.
Innovation Solution
The liquid crystal display device incorporates a quantum-dot color filter with a transparent stacked layer positioned higher than the pixel separation layer, along with an optical film layer and an upper polarizing sheet, to manage light incidence and polarization, thereby reducing the maximum incident angle and preventing brightening and color deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the quantum-dot color filter uses a traditional flat structure with pixel separation layer and color resist units at the same level, then the manufacturing process is simple, but light path deviation occurs at large viewing angles causing brightening and color deviation
Solution Approach 1:
The patent introduces a vertical dimension to the color filter structure by stacking the quantum-dot color resist unit above the pixel separation layer using a transparent support layer. This three-dimensional arrangement changes the light interaction geometry, preventing oblique light from reaching the quantum-dot material at large viewing angles while maintaining manufacturing feasibility through sequential layer deposition
Solution Approach 2:
The transparent support layer acts as an intermediary component that elevates the quantum-dot color resist unit above the pixel separation layer. This intermediate structure controls light incidence angles and prevents direct illumination of the quantum-dot material from oblique directions, thereby eliminating viewing angle-dependent display defects
2Volume of moving object
If the quantum-dot color resist unit is positioned at the same level as the pixel separation layer, then the structure is compact, but oblique light can excite quantum dots causing black screen brightening
Solution Approach 1:
The patent resolves the conflict between compactness and preventing harmful light excitation by transitioning from a two-dimensional planar arrangement to a three-dimensional stacked configuration. The vertical stacking maintains space efficiency while the height difference created by the transparent support layer blocks oblique light paths that would otherwise excite quantum dots and cause black screen brightening
Solution Approach 2:
The transparent support layer performs preliminary anti-action by preemptively blocking oblique light before it can reach the quantum-dot color resist unit. This preventive structure stops harmful light excitation at the source, preventing black screen brightening and color deviation before they occur
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 configuration enhances the display effect by preventing brightening and color deviation during large viewing-angle displays, ensuring accurate black screen representation and improved image quality.
Implementation Method 1
Because of the quantum confinement effect, the transportation of the inner electrons and holes are restricted to make the continuous energy band structure become the disjunct level structure
Implementation Method 2
In general, a long wavelength can be absorbed when the particle size thereof is smaller, and a short wavelength can be absorbed when the particle size thereof is bigger. Generally, blue light having a short wavelength can be absorbed by the quantum dots to excite color light having a long wavelength
Implementation Method 3
The quantum dots emit colorful light beams when being excited by an external energy such as light, electricity, or the like
Implementation Method 4
In the light path of the liquid crystal display panel, the actual optical paths of vertical incident light and oblique incident light irradiating through the liquid crystal layer 30 are different
Implementation Method 5
changes of polarization will likely be produced in a squint direction because of the deviation of the light path thereof
Data Source
AI summary
An LCD device is provided. The liquid crystal panel thereof includes first and second substrates (opposite each other). The first substrate sequentially includes a first underlay-substrate, a quantum-dot color filter, and an encapsulation layer. The quantum-dot color filter includes a pixel separation layer and several color resist units which are separated by the pixel separation layer, and include first, second and third color resist units, where at least one is a quantum-dot color resist unit. There is a transparent stacked layer between the quantum-dot color resist unit and the encapsulation layer in the quantum-dot color filter, thus the quantum-dot color resist unit has a higher standing point than the pixel separation layer on the encapsulation layer. The phenomenon of the brightening and color deviation of the black screen of the liquid crystal display device at the time of a large viewing-angle displaying can be prevented to enhance display effect.