Quantum Dot Display Structure Without a 1/4 Wave Polarizer
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Solution Overview
Problem
Display apparatuses with color conversion layers face structural complexity, high manufacturing costs, and reduced transmittance due to the inclusion of a ¼ polarizer, which complicates the manufacturing process and increases costs.
Innovation Solution
A display apparatus design that omits the ¼ wave polarizer, utilizing a backlight unit with blue, green, and red color conversion materials, combined with polarizers and black matrices to enhance transmittance and simplify structure, while using blue LEDs with a peak wavelength of 455 nm or less to reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color conversion layer with quantum dots is added to improve color reproducibility and luminous efficiency, then display quality is improved, but structural complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the color conversion layer with the liquid crystal display structure by integrating quantum dot particles into the display panel layers. The quantum dots are incorporated into existing layers such as the encapsulation layer or color filter layer, merging multiple functions into a unified structure rather than adding separate components.
Solution Approach 2:
The color conversion layer serves multiple functions simultaneously: it converts blue LED light to red and green wavelengths, acts as a color filtering mechanism, and enhances the overall luminous efficiency of the display. This multi-functionality reduces the need for separate color generation components.
2Object-affected harmful factors
If a 1/4 polarizer is added to reduce external light reflection, then anti-glare performance is improved, but transmittance decreases and manufacturing cost increases
Solution Approach 1:
The patent removes the 1/4 wave polarizer from the display structure while maintaining anti-glare performance through alternative means. The reflection reduction function is achieved through the liquid crystal layer's optical properties and the use of circular polarization filters, extracting the unnecessary component that was causing transmittance loss.
Solution Approach 2:
The patent uses circular polarization filters that replicate the anti-glare effect of the 1/4 polarizer but with superior transmittance characteristics. The circular polarization approach copies the glare reduction function while avoiding the energy loss associated with traditional linear polarizers.
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
Improves transmittance, simplifies structure, and reduces manufacturing costs by eliminating the ¼ polarizer and using efficient blue LEDs, enhancing luminous efficiency through quantum dot luminescence.
Implementation Method 1
blue LEDs with a peak wavelength of 455 nm or less
Implementation Method 2
a color conversion layer using photoluminescence
Implementation Method 3
a first polarizer disposed on the backlight unit, a second polarizer disposed on the thin film transistor, and a third polarizer disposed on the second base substrate
Data Source
AI summary
A display apparatus includes a backlight unit comprising a light source emitting blue light, a green color conversion material and a red color conversion material, a first polarizer disposed on the backlight unit, a first base substrate disposed on the first polarizer, a thin film transistor disposed on the first base substrate, a second polarizer disposed on the thin film transistor, a first color conversion pattern and a second color conversion pattern disposed on the second polarizer, a first color filter disposed on the first color conversion pattern, a second color filter disposed on the second color conversion pattern, a second base substrate disposed on the first and second color filters, and a third polarizer disposed on the second base substrate and having a polarizing axis same as a polarizing axis of the second polarizer.