Liquid Crystal Display Color Conversion Layer Using Block Copolymers and Quantum Rods
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges with color purity and uniform luminance due to the use of cold cathode fluorescent lamps (CCFLs) and have high costs with three-color LEDs, while white LEDs offer lower color reproducibility compared to three-color LEDs.
Innovation Solution
A liquid crystal display incorporating a color conversion layer with block copolymers and quantum rods, which converts blue light into white light, improving color reproducibility and potentially replacing the need for a polarizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a white LED converting light from a single color LED chip is used, then manufacturing cost is reduced, but color reproducibility deteriorates
Solution Approach 1:
The patent uses a composite material system comprising a block copolymer matrix with dispersed quantum rods. The block copolymer consists of different polymer blocks that self-assemble to create distinct phases, one of which incorporates the quantum rods. This composite structure enables simultaneous achievement of low manufacturing cost (using single-color LED chips) and high color reproducibility (through quantum rod-mediated wavelength conversion).
Solution Approach 2:
The patent implements local quality by concentrating quantum rods in specific regions within the block copolymer structure. The quantum rods are dispersed within one of the block structure units, creating localized zones of high quantum rod concentration that perform the critical wavelength conversion function, while other regions provide structural support and optical transmission.
2Manufacturing precision
If three color LEDs are used as light source, then color purity is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the color conversion function from the light source itself (three-color LEDs) and transfers it to a separate color conversion layer containing quantum rods. This allows the use of simpler, lower-cost single-color LED chips as the light source while achieving the desired color purity through the quantum rod conversion layer, effectively separating the illumination function from the color conversion function.
3Ease of manufacture
If CCFL is used as backlight unit, then manufacturing cost is reduced, but color purity and luminance uniformity deteriorate
Solution Approach 1:
The patent fundamentally changes the operating parameters of the LED light source by using quantum rods to convert the wavelength of emitted light. Instead of relying on the inherent spectral characteristics of CCFL or three-color LEDs, the system uses quantum rod size and composition to precisely control the converted wavelength, achieving high color purity with low-cost components.
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 color reproducibility and display quality by polarizing light, allowing for improved wide view angles and potentially reducing manufacturing costs by eliminating the need for additional polarizing components.
Implementation Method 1
a color conversion layer with block copolymers and quantum rods, which converts blue light into white light
Implementation Method 2
The block copolymer is separated into a first block structure unit formed by the first copolymer and a second block structure unit formed by the second copolymer
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment of the present invention includes: a display panel, and a color conversion layer coupled to the display panel and having a color conversion layer, where the color conversion layer includes a block copolymer including a first copolymer and a second copolymer, and quantum rods dispersed within the block copolymer. The block copolymer includes a first block structure unit formed by the first copolymer; and a second block structure unit formed by the second copolymer, where the quantum rods is are disposed within either one of the first block structure unit and the second block structure unit.