Integrated LED Pixel Structure With Wavelength Conversion
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Solution Overview
Problem
Existing display devices using liquid crystal displays (LCDs) require a separate backlight, which limits their compactness and light efficiency, and there is a need for a simplified manufacturing process for high-efficiency LED display apparatuses.
Innovation Solution
A display apparatus with a pixel array comprising sub-pixels arranged on a circuit board, where each sub-pixel includes a lower LED cell with a semiconductor stack generating light of a specific wavelength, and a wavelength conversion structure to convert light into different wavelengths, allowing for a compact and high-brightness display without a separate backlight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a separate backlight using LED elements is used in LCD display, then light efficiency is improved, but device complexity and size increase
Solution Approach 1:
The patent merges the backlight function and display pixel function into a single integrated structure. Each pixel contains embedded LED cells that serve both as light sources and display elements, eliminating the need for a separate backlight unit while maintaining high light efficiency
Solution Approach 2:
The LED cells within each pixel serve multiple functions: they generate light for display, act as the light source replacing the separate backlight, and provide the display function itself. This multi-functionality reduces overall device complexity while improving light efficiency
2Illumination intensity
If a separate backlight is used in LCD display, then brightness is achieved, but compactness is reduced
Solution Approach 1:
The patent implements a nested structure where LED cells are embedded within the pixel structure itself. The light-generating elements are nested inside the display pixels, allowing the light source and display function to occupy the same spatial volume, thereby achieving compactness while maintaining brightness
Solution Approach 2:
The patent transitions from a planar LCD structure requiring a separate backlight layer to a three-dimensional integrated structure where LED cells are positioned within and around the pixel elements, utilizing vertical space to achieve compactness without compromising brightness
3Ease of manufacture
If traditional LCD manufacturing process is used, then liquid crystal display is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the display into modular pixel units, each containing integrated LED cells and pixel electrodes. This segmentation allows for standardized manufacturing of individual pixel modules that can be assembled systematically, simplifying the overall manufacturing process compared to traditional LCD fabrication
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 solution enables the creation of a high-efficiency LED display apparatus that is compact, has superior light efficiency, and can be manufactured in a simplified process, overcoming the limitations of traditional LCDs.
Implementation Method 1
each of the lower LED cells having a first semiconductor stack configured to generate light of a first wavelength
Implementation Method 2
a wavelength conversion structure disposed on the third lower LED cell and configured to convert light of the first wavelength into light of a third wavelength
Data Source
AI summary
A display apparatus includes a circuit board including a driving circuit, and a pixel array including a plurality of pixels on the circuit board, each including a plurality of sub-pixels, and a light blocking partition between the plurality of sub-pixels. Each of the plurality of sub-pixels includes a lower light emitting diode (LED) cell configured to generate light of a first wavelength. A first sub-pixel includes a transparent resin structure on the first lower LED cell, a second sub-pixel includes an inter-cell insulating layer on the second lower LED cell and an upper LED cell having on the inter-cell insulating layer and configured to generate light of a second wavelength, and a third sub-pixel includes a wavelength conversion structure on the third lower LED cell and configured to convert light of the first wavelength into light of a third wavelength.