Optical Structure Gaps Enhance LED Color Purity
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Solution Overview
Problem
Increasing the luminous efficiency and color purity of LED display devices remains a challenging research topic, as existing technologies face difficulties in effectively utilizing light-emitting diodes (LEDs) to achieve optimal color conversion without significant material costs or light leakage.
Innovation Solution
The implementation of a display device design that includes a circuit substrate, LED, encapsulate layer, color conversion layer, and first optical structure with periodically arranged gaps, where the refractive index of the optical structure is higher than the encapsulate layer, enhancing light conversion and reducing direct transmission through the color conversion layer, allowing for a thinner color conversion layer and material cost savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the color conversion layer is made thicker to improve color conversion effectiveness, then color purity is improved, but light leakage increases and luminous efficiency decreases
Solution Approach 1:
The first optical structure serves as an intermediary between the encapsulate layer and the color conversion layer. It has a refractive index higher than the encapsulate layer and includes multiple periodically arranged gaps with width of 1-10 micrometers. This optical structure modifies light transmission properties, reducing direct light transmission through the color conversion layer while maintaining effective color conversion, thereby allowing a thinner color conversion layer to achieve the desired color purity without excessive light leakage
Solution Approach 2:
The patent changes the refractive index parameter by introducing the first optical structure with a refractive index higher than the encapsulate layer. This parameter change affects light transmission characteristics, enabling reduced light leakage while maintaining color conversion effectiveness with a thinner color conversion layer, thus resolving the contradiction between color purity and luminous efficiency
2Measurement precision
If a thicker color conversion layer is used to reduce light leakage, then color purity is improved, but material costs increase
Solution Approach 1:
The first optical structure acts as an intermediary that reduces direct light transmission through the color conversion layer. This allows the color conversion layer to be made thinner while still achieving effective color conversion and reduced light leakage, thereby reducing the quantity of color conversion material needed and lowering material costs while maintaining color purity
3Use of energy by moving object
If the refractive index of the optical structure is increased to reduce light transmission, then light conversion efficiency is improved, but device complexity increases
Solution Approach 1:
The first optical structure is segmented into multiple periodically arranged gaps with width of 1-10 micrometers. This segmentation approach allows the structure to achieve high light conversion efficiency through periodic optical modulation while maintaining a relatively simple overall design. The periodic gap structure is easier to manufacture than continuous high-refractive-index layers, thus reducing device complexity while improving light conversion efficiency
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 design improves light conversion efficiency and reduces light leakage, enabling the color conversion layer to be thinner while maintaining effective color conversion, thereby enhancing the luminous efficiency and color purity of LED display devices.
Implementation Method 1
The refractive index of the material of the first optical structure is greater than that of the material of the encapsulate layer
Implementation Method 2
The color conversion layer overlaps the LED
Implementation Method 3
The color conversion layer overlaps the LED
Data Source
AI summary
A display device includes a circuit substrate, a light emitting diode, an encapsulation layer, a color conversion layer and a first optical structure. The light emitting diode is located on the circuit substrate. The encapsulation layer covers the light emitting diode. The color conversion layer overlaps the light emitting diode. The first optical structure overlaps the color conversion layer and is located between the encapsulation layer and the color conversion layer. The first optical structure includes first gaps periodically arranged with a first pitch on a first direction. The width of each first gap in the first direction is 1 micrometer to 10 micrometers. A refractive index of a material of the first optical structure is greater than a refractive index of a material of the encapsulation layer.