Blue Multi-Layer LED Backlight for Higher Display Light Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display apparatuses face challenges in achieving high light efficiency and energy efficiency due to limitations in the light-emitting diodes (LEDs) used in their backlight units.
Innovation Solution
The proposed solution involves a light-emitting diode (LED) with multiple light-emitting layers that emit blue light at different wavelengths, integrated into a display apparatus. Each light-emitting layer is designed to emit light within the 430 nm to 480 nm wavelength range, with a wavelength difference of at least 5 nm between adjacent layers. This configuration enhances light efficiency and energy efficiency by reducing current density and increasing the probability of electron-hole recombination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single light-emitting layer is used in the LED, then the device complexity is low, but the light efficiency is insufficient
Solution Approach 1:
The light-emitting diode is divided into multiple light-emitting layers (first, second, and third light-emitting layers) with different wavelengths, allowing each layer to emit light independently. This segmentation increases the overall light efficiency by utilizing multiple emission sources while managing complexity through modular layer design.
2Productivity
If multiple light-emitting layers with different wavelengths are used, then the light efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
Each light-emitting layer is designed with specific local properties - the first layer emits blue light at a first wavelength, the second layer emits blue light at a second wavelength, and the third layer emits blue light at a third wavelength. This local quality differentiation allows each layer to be optimized for its specific wavelength emission, improving overall light efficiency while maintaining manageable manufacturing precision through specialized design of each layer.
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 use of multiple light-emitting layers in the LED results in improved light efficiency and energy efficiency for the display apparatus, leading to enhanced luminance and reduced power consumption.
Implementation Method 1
a first light-emitting layer configured to emit light of a first wavelength, the first light-emitting layer being disposed below the growth substrate... a second light-emitting layer configured to emit light of a second wavelength that is longer than the first wavelength... a third light-emitting layer configured to emit light of a third wavelength that is longer than the second wavelength
Data Source
AI summary
A display apparatus, includes: a liquid crystal panel; and a backlight configured to provide light to the liquid crystal panel, the backlight including a substrate and a light-emitting diode (LED) that is mounted on the substrate. The LED includes a plurality of light-emitting layers configured to emit light of different wavelengths. A wavelength of light emitted from each of the plurality of light-emitting layers is greater than or equal to 430 nm and less than or equal to 480 nm.