Light-Emitting Substrate Grating Structure for Micro-LED Color Purity
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Solution Overview
Problem
The increasing resolution requirements in display products pose a challenge for reducing the size of Micro-LED chips and RGB color film layers, making it difficult to maintain effective color patterns and purity.
Innovation Solution
A light-emitting substrate with a grating structure that includes regions configured to transmit light of different wavelength bands, replacing the traditional color film layer, which allows for selective transmission of light and filters out stray light to enhance color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of Micro-LED chips is reduced to achieve higher resolution, then display resolution is improved, but the manufacturing precision and color pattern quality deteriorate
Solution Approach 1:
The patent introduces a grating structure as an intermediary component between the Micro-LED chip and the color film layer. This grating structure with periodic patterns acts as a mediator that manipulates light propagation, enabling color separation and enhancement without requiring high-precision color film patterns. The grating structure converts the challenge of small chip size into an opportunity for diffraction-based color control.
Solution Approach 2:
The patent changes the optical parameters by introducing periodic grating structures with specific periods and depths. By adjusting the grating period, depth, and material properties, the optical path and light diffraction characteristics are modified to achieve superior color separation and purity, compensating for the reduced chip size and maintaining color pattern quality.
2Measurement precision
If the size of RGB color film layer is reduced to match smaller Micro-LED chips, then display resolution is improved, but the color purity and pattern definition deteriorate
Solution Approach 1:
The grating structure serves as an optical intermediary that performs color separation through diffraction and interference effects. Instead of relying solely on the physical size and precision of the color film layer, the grating structure mediates the optical interaction to achieve high color purity even with reduced color film dimensions.
Solution Approach 2:
The patent replaces the mechanical/physical approach of using large, high-precision color film patterns with an optical approach using grating-induced diffraction and interference. This substitution allows color separation to be achieved through optical phenomena rather than relying on mechanical precision of the color film layer.
3Ease of manufacture
If traditional color film layer structure is used, then manufacturing process is simpler, but color stringing issues occur and color purity is reduced
Solution Approach 1:
The patent segments the optical function by separating the color generation and color separation functions. The Micro-LED chip generates light, the grating structure separates colors through diffraction, and the color film layer enhances color purity. This functional segmentation allows each component to be optimized independently, achieving high color purity without complicating the overall manufacturing process.
Solution Approach 2:
The patent adds a vertical dimension to color control by using the grating structure's periodic patterns in the vertical optical path. Instead of relying solely on horizontal color film patterns, the grating structure introduces vertical periodicity that creates diffraction orders, enabling color separation through a different spatial dimension.
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 grating structure enables high-quality color LED devices with improved color purity and avoids color stringing issues, while reducing the complexity of manufacturing color film layers and enabling smaller Micro-LED sizes for higher resolution displays.
Implementation Method 1
a grating structure, on a side of the plurality of light-emitting chips facing away from the driving backplane, where the grating structure has a plurality of regions, and the plurality regions is configured to transmit light of different wavelength bands
Implementation Method 2
each region corresponding to a different grating period
Implementation Method 3
the plurality regions is configured to transmit light of different wavelength bands
Data Source
AI summary
Provided in the present disclosure are a light-emitting substrate and a display apparatus. The light-emitting substrate includes: a driving backplane; a plurality of light-emitting chips, arranged on the driving backplane in an array, where the light-emitting chip includes a buffer layer, an N-type semiconductor layer, a multi-quantum well layer, and a P-type semiconductor layer sequentially arranged on the driving backplane in a stacked manner; and a grating structure, on a side of the plurality of light-emitting chips facing away from the driving backplane, where the grating structure has a plurality of regions, and the regions are configured to transmit light of different wavelength bands.