LED Package Partition Structure for Color Reproduction
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Solution Overview
Problem
Conventional display devices using liquid crystal displays face limitations in color reproduction and optical efficiency, particularly in achieving high brightness and various aspect ratios, as they require additional backlighting and have restricted forms and sizes.
Innovation Solution
A method of fabricating a light emitting device package involves forming semiconductor light emitting parts with conductive layers and active layers on a growth substrate, creating a partition structure with light emitting windows, and filling these windows with resins containing phosphors to form wavelength conversion parts, which are then planarized to enhance color reproduction capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid crystal displays are used for display devices, then the devices can be manufactured with conventional processes, but the color reproduction capability and optical efficiency are limited
Solution Approach 1:
The patent changes the fundamental operating parameters of the display device by replacing liquid crystal technology with LED technology. This involves changing the light generation mechanism from backlight-dependent liquid crystal modulation to direct LED emission with wavelength conversion, thereby improving color reproduction capability while maintaining manufacturability through standardized semiconductor fabrication processes
Solution Approach 2:
The patent employs composite materials in the form of wavelength conversion layers containing phosphors mixed with resin materials. These composite structures enable precise color control by selecting different phosphor combinations, thereby achieving superior color reproduction capability while using conventional coating and curing processes for manufacturability
2Ease of manufacture
If liquid crystal displays with additional backlighting are used, then the devices can be manufactured, but the optical efficiency is reduced and the device size increases
Solution Approach 1:
The patent extracts and eliminates the separate backlight unit from the display structure by integrating light generation directly into the pixel structure using LEDs. This removes the inefficient light transmission path through liquid crystals and multiple layers, thereby improving optical efficiency while simplifying the manufacturing process
Solution Approach 2:
The patent merges the light generation function and the pixel function into a single integrated structure. The LED and wavelength conversion layer are formed directly on the same substrate where pixel electrodes and transparent conductive layers are located, eliminating the need for separate backlighting components and improving overall optical efficiency
3Adaptability or versatility
If liquid crystal displays are used, then conventional display forms can be maintained, but the device cannot achieve high brightness and various aspect ratios
Solution Approach 1:
The patent changes the fundamental light generation parameter from indirect backlighting to direct LED emission, enabling high brightness levels. The LED structure allows for high current density operation and efficient wavelength conversion, achieving brightness levels that exceed conventional liquid crystal display capabilities
Solution Approach 2:
The patent creates a universal display platform using LED technology that can be adapted to various display forms and aspect ratios. The flexible substrate and conformal deposition processes allow the same manufacturing approach to be used for different device geometries, enabling both high brightness and form factor versatility
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 method improves color reproduction and optical efficiency by allowing for compact, high-brightness displays with various aspect ratios and forms, enabling the creation of large displays with improved color accuracy and reduced optical interference between pixels.
Implementation Method 1
filling each of the plurality of light emitting windows with a resin having a phosphor, and forming a plurality of wavelength conversion parts
Data Source
AI summary
A method of fabricating a light emitting device package includes forming a plurality of semiconductor light emitting parts, each having a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer on a growth substrate, forming a partition structure having a plurality of light emitting windows on the growth substrate, filling each of the plurality of light emitting windows with a resin having a phosphor, and forming a plurality of wavelength conversion parts by planarizing a surface of the resin.