Quantum Dot Layer Protection in LCD Backlight Units
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Solution Overview
Problem
Liquid crystal displays (LCDs) using LED backlight sources have a narrower color gamut, leading to color distortion due to the limited spectrum of the LED light source.
Innovation Solution
A display panel design incorporating a quantum dot layer with varying diameters corresponding to primary colors, positioned between the liquid crystal layer and a protection layer, which enhances the color gamut by compensating for the limited spectrum of the LED light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED is used as backlight source, then energy efficiency is improved, but color gamut is narrowed
Solution Approach 1:
A quantum dot layer is introduced as an intermediary between the LED backlight source and the liquid crystal display panel. This quantum dot layer converts the narrow-spectrum LED light into a broader spectrum with enhanced color gamut by utilizing quantum confinement effects to emit specific wavelengths that fill in the spectral gaps of the LED source.
Solution Approach 2:
The patent changes the spectral parameters of the backlight by using quantum dots with specific size distributions. By controlling the diameter of quantum dots, the emission spectrum is adjusted to achieve optimal color gamut while maintaining LED energy efficiency. The quantum dot layer transforms the spectral characteristics of the backlight source.
2Quantity of substance
If quantum dot layer is added to expand color gamut, then color gamut is improved, but device complexity is increased
Solution Approach 1:
The quantum dot layer serves multiple functions simultaneously: it expands the color gamut, maintains compatibility with existing LED backlight structures, and can be integrated into standard LCD manufacturing processes. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The patent uses composite material structures combining quantum dots with encapsulation layers and adhesive materials. This composite approach allows the quantum dot layer to be integrated into the existing display structure without requiring completely new manufacturing processes, thereby limiting the increase in device complexity.
3Ease of manufacture
If quantum dot layer is exposed to air, then manufacturing is simplified, but oxidation occurs reducing effectiveness
Solution Approach 1:
The patent employs an encapsulation structure that creates a protective environment around the quantum dot layer, isolating it from oxygen and moisture in the air. This encapsulation maintains the quantum dots in a stable, non-oxidizing environment while allowing for practical manufacturing processes.
Solution Approach 2:
The encapsulation layers are applied to the quantum dot layer during the manufacturing process before the display device is assembled and sealed. This preliminary protection prevents oxidation from occurring during subsequent handling, assembly, and operation of the display device.
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 quantum dot layer increases the display color gamut value, improving the display effect by emitting primary colors and filtering out other colors, while the protection layer prevents oxidation, maintaining the quantum dot layer's effectiveness.
Implementation Method 1
the quantum dot layer is formed by quantum dots having three types of diameters by a preset mixing ratio; the three types of diameters respectively correspond to three primary colors of light
Implementation Method 2
the protection layer for protecting the quantum dot layer is used for preventing the quantum dot layer from being oxidized
Data Source
AI summary
A display panel and a liquid crystal display are disclosed. The display panel includes an upper polarizer, a lower polarizer, a first substrate and a second substrate disposed oppositely between the upper polarizer and the lower substrate, a liquid crystal layer disposed between the first substrate and the second substrate, a quantum dot layer disposed at a side of the second substrate which is far away from the liquid crystal layer, and a protection layer for protecting the quantum dot layer, disposed between the quantum dot layer and the lower polarizer. The quantum dot layer is disposed at a side of the second substrate far away from the liquid crystal layer, and the protection layer is disposed between the quantum dot layer and the lower polarizer. The protection layer is used for preventing the quantum dot layer from being oxidized. The color gamut of LCD can be increased.