Stacked LED Display Panel With Color Conversion for Smaller Pixels
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Solution Overview
Problem
Existing display panels require multiple light emitting diodes (LEDs) of different colors per pixel, which increases complexity and occupies a large area, making the manufacturing process cumbersome.
Innovation Solution
A display panel design that utilizes vertically stacked LEDs with integrated color conversion layers and transparent optical layers, allowing two types of LEDs per pixel to emit multiple colors, reducing the number of LEDs required and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light emitting diodes of different colors are used per pixel, then color output capability is improved, but pixel area and device complexity increase
Solution Approach 1:
The patent combines multiple light emitting diodes (first LED emitting first color, second LED emitting second color) into a single pixel unit, where both LEDs share common substrate electrodes and control circuitry. This merging approach enables full-color output through color mixing while reducing the overall pixel area compared to using separate single-color LED units.
Solution Approach 2:
The patent arranges the first and second light emitting diodes in a vertical stacked configuration rather than horizontal placement, utilizing the vertical dimension to pack multiple LEDs into a smaller footprint. The LEDs are positioned at different heights above the substrate, allowing color output diversity without proportionally increasing pixel area.
2Adaptability or versatility
If multiple light emitting diodes of different colors are used per pixel, then color output capability is improved, but manufacturing complexity increases
Solution Approach 1:
The substrate electrodes serve multiple functions: they provide electrical connection to both the first and second light emitting diodes, act as common control terminals, and enable individual addressing of each LED. This multi-functionality reduces the number of separate connection structures needed, simplifying the manufacturing process despite having multiple LEDs per pixel.
Solution Approach 2:
The patent divides the pixel into distinct functional modules: substrate electrodes layer, first light emitting diode, second light emitting diode, and color conversion layer. This segmentation allows each component to be manufactured and tested separately before assembly, reducing overall manufacturing complexity while maintaining color output capability.
3Ease of manufacture
If vertically stacked LEDs with color conversion layers are used, then manufacturing process is simplified and area is reduced, but device structure complexity increases
Solution Approach 1:
The patent implements a nested structure where the first light emitting diode is positioned below the second light emitting diode, both sharing the same substrate electrode base. The color conversion layer is further nested on top of the stacked LEDs. This nested arrangement consolidates multiple components into a compact vertical structure, simplifying manufacturing while managing structural complexity through hierarchical organization.
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 reduces the pixel area by approximately 2/3 and simplifies the manufacturing process by using fewer LEDs, while maintaining color output efficiency.
Implementation Method 1
a color conversion layer on a light emitting surface of the first light emitting part; and a first contact electrode, a second contact electrode, a third contact electrode, and a fourth contact electrode which are connected to the plurality of substrate electrodes. The color conversion layer may include a quantum dot configured to emit light of the first color by exciting lights respectively emitted from the first light emitting part and the second light emitting part.
Implementation Method 2
a plurality of first light emitting diodes electrically connected to the plurality of substrate electrodes, and configured to emit light of a first color; and a plurality of second light emitting diodes electrically connected to the plurality of substrate electrodes, each of the plurality of second light emitting diodes being configured to emit light of a second color and emit light of a third color
Data Source
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AI summary
A display panel includes: a substrate; a plurality of substrate electrodes on the substrate; a plurality of first light emitting diodes electrically connected to the plurality of substrate electrodes, and configured to emit light of a first color; and a plurality of second light emitting diodes electrically connected to the plurality of substrate electrodes, each of the plurality of second light emitting diodes being configured to emit light of a second color and emit light of a third color, wherein the second color and the third color are different from the first color.