Quantum Dot LED Lens for LCD Color Gamut
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Solution Overview
Problem
Current LCD display backlighting technologies face challenges in achieving a high color gamut while balancing manufacturing complexity and cost, with CCFL providing better color gamut but being less energy efficient and costly, and white LEDs offering poorer color gamut and requiring complex voltage conversion.
Innovation Solution
Incorporating quantum dots within the lens of blue LEDs to emit red and green light when stimulated by blue light, creating a pure white light source for LCD panels, which can be enhanced with glass or crystalline crystals for improved light scattering and focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If CCFL backlighting is used, then color gamut is improved, but energy efficiency deteriorates and cost increases
Solution Approach 1:
The patent changes the spectral parameters of the backlight by using blue LEDs with peak wavelengths between 440-480nm combined with quantum dots having specific size ranges (2-10nm) that emit at precise wavelengths. This parameter optimization achieves color gamut comparable to or exceeding CCFL while maintaining LED energy efficiency advantages
Solution Approach 2:
The patent creates a composite backlighting system combining blue LEDs with quantum dot materials embedded in the lens. This composite structure leverages the energy efficiency of LEDs and the superior color emission properties of quantum dots, achieving both high color gamut and low energy consumption
2Use of energy by moving object
If white LEDs with yellow phosphor coating are used, then energy efficiency is improved, but color gamut deteriorates
Solution Approach 1:
The patent extracts the yellow phosphor coating that limits color gamut and replaces it with quantum dot materials. By removing the restrictive yellow phosphor layer and using quantum dots instead, the system maintains LED energy efficiency while dramatically improving color emission characteristics
Solution Approach 2:
The patent changes the emission spectrum parameters by replacing broad-spectrum yellow phosphor with quantum dots of specific sizes (2-10nm) that emit at narrow, precise wavelengths. This parameter precision enables saturated red and green colors while maintaining the energy efficiency of LED excitation
3Illumination intensity
If quantum dots are embedded in the lens of blue LEDs, then color gamut is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the quantum dot embedding process with the existing LED lens manufacturing process. Quantum dots are incorporated into the lens material itself during fabrication, combining multiple functions (structural support, light emission, color filtering) into a single integrated component rather than requiring separate assembly steps
Solution Approach 2:
The LED lens serves multiple functions simultaneously: it provides structural protection for the LED, acts as a light diffuser, and contains embedded quantum dots that emit specific colors. This multi-functionality reduces the number of separate components needed and simplifies the overall manufacturing process
4Illumination intensity
If color filter film is used with white LEDs, then color gamut is improved, but alignment precision requirements increase
Solution Approach 1:
The patent extracts and removes the separate color filter film layer from the display structure. By embedding color-emitting quantum dots directly in the LED lens, the system eliminates the need for precise alignment between color filters and pixel gates, as the colors are generated at the light source itself rather than filtered afterward
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 approach enhances the color gamut of LCD displays by producing pure and saturated colors, reducing the need for complex color filter alignment and improving energy efficiency, while maintaining cost-effectiveness.
Implementation Method 1
quantum dots which is semiconductor nano size crystals that emit light of specific wavelengths when stimulated with light
Implementation Method 2
The quantum dots fixed to the film will, when stimulated by blue light will in turn emit red and green light and will pass some amount of blue light around the quantum dots as scattered blue light
Implementation Method 3
enhanced with glass or crystalline crystals for improved light scattering and focusing
Data Source
AI summary
A light emitting diode system, with an LED junction, energized to emit light, and a lens cap, covering the LED junction device and receiving the light. The lens cap can be formed in a shape to focus the light, for example. The material forming the lens cap has quantum dots mixed in with the supporting material, which can be in multiple colors. The supporting material can also have particles of glass or other crystalline material mixed therein. There can also be an outer casing over the supporting material, and the outer casing can also have glass or other crystalline particles mixed in.