Multi-Active-Layer Display Pixels Without Wavelength Conversion
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Solution Overview
Problem
Existing display devices require a wavelength conversion layer to achieve various colors, which increases complexity and cost.
Innovation Solution
A display device with ultra-small light-emitting diode elements emitting red, green, and blue wavelengths without a wavelength conversion layer, utilizing a common electrode layer and varying current densities and application periods for each element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wavelength conversion layer is used to achieve various colors, then color display capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention divides the pixel structure into multiple independent light-emitting elements (first, second, and third light-emitting elements) that directly emit different colors (red, green, and blue) without requiring a wavelength conversion layer. Each light-emitting element has its own active layer configured to emit a specific color, thereby achieving color display capability while reducing device complexity by eliminating the wavelength conversion layer.
2Adaptability or versatility
If a wavelength conversion layer is used to achieve various colors, then color display capability is improved, but manufacturing cost increases
Solution Approach 1:
The invention segments the color emission function across multiple light-emitting elements with different active layers, eliminating the need for a wavelength conversion layer. This approach reduces manufacturing cost by removing an additional fabrication step and material layer while maintaining the ability to display various colors through direct emission from the segmented light-emitting elements.
3Adaptability or versatility
If different active layers with different materials are used for different light-emitting elements, then color emission capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention applies local quality by configuring each light-emitting element's active layer with specific material composition and indium content tailored to its intended emission color. The first light-emitting element has an active layer with first indium content for red emission, the second has second indium content for green emission, and the third has third indium content for blue emission. This localized material optimization enables precise color emission control while managing manufacturing precision requirements through targeted material specification.
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
Enables the display of various colors without a wavelength conversion layer, simplifying the manufacturing process and reducing costs.
Implementation Method 1
a first light-emitting element that is configured to emit first light according to a first driving current and a second light-emitting element that is configured to emit second light according to a second driving current
Data Source
AI summary
A display device includes a substrate, a plurality of pixel electrodes on the substrate and spaced apart from each other, a plurality of light-emitting elements on the plurality of pixel electrodes, respectively, and a common electrode layer on the plurality of light-emitting elements and to which a common voltage is applied. The plurality of light-emitting elements include a first light-emitting element that is configured to emit first light according to a first driving current and a second light-emitting element that is configured to emit second light according to a second driving current. An active layer of the first light-emitting element is the same as an active layer of the second light-emitting element.