Inorganic Light-Emitting Diode Display with Directional Shielding
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Solution Overview
Problem
Inorganic electroluminescent displays with inorganic light-emitting diodes face the challenge of color mixture due to light emitted by adjacent elements intersecting each other's surfaces, leading to inefficient light output and potential environmental resistance issues.
Innovation Solution
A display device design featuring a substrate with arrayed pixels, each equipped with inorganic light-emitting elements and strategically positioned light-shielding portions that prevent light output in intersecting directions, ensuring that light is emitted only from specific surfaces and reducing color mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plurality of light-emitting elements are disposed side by side to form a display, then the display can show multiple colors, but color mixture of light occurs between adjacent elements
Solution Approach 1:
The patent divides the light emission control into separate directional segments by providing first light-shielding portions for side surfaces and second light-shielding portions for top/bottom surfaces. This segmentation allows each light-emitting element to emit light only in its designated direction without interfering with adjacent elements, thereby preventing color mixture while maintaining multi-color display capability.
Solution Approach 2:
The patent applies different light-shielding properties to different parts of the light-emitting element structure. Specifically, side surfaces are equipped with first light-shielding portions while top and bottom surfaces have second light-shielding portions with different optical characteristics. This local differentiation enables precise control over light emission directions, allowing color separation while maintaining display versatility.
2Manufacturing precision
If light-shielding portions are added to prevent color mixture, then color accuracy improves, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the light-shielding portions. These structures simultaneously serve as light shields to prevent color mixture, as electrical conductors connected to the cathode, and as structural support elements. By combining these functions into single integrated components, the patent achieves high color accuracy without proportionally increasing device complexity.
Solution Approach 2:
The light-shielding portions are designed with multi-functionality, serving simultaneously as optical shields, electrical conductors, and structural elements. This universal design approach allows the same component to address multiple requirements (color separation, electrical connection, mechanical support), thereby improving color accuracy while minimizing the increase in device complexity.
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 effectively prevents color mixture by directing light output from specific surfaces, enhancing light use efficiency and maintaining high environmental resistance, thus improving the display's performance and reliability.
Implementation Method 1
inorganic electroluminescent (EL) displays provided with inorganic light-emitting diodes (micro LEDs) serving as display elements
Implementation Method 2
a first light-shielding portion electrically coupled to a cathode of the corresponding inorganic light-emitting element and that prevents output of light traveling in a direction intersecting the first side surface of the inorganic light-emitting element
Data Source
AI summary
A display device includes a substrate, a plurality of pixels, a plurality of inorganic light-emitting elements, and a first light-shielding portion. The pixels are arrayed on the substrate. The inorganic light-emitting elements are provided corresponding to the respective pixels and each have a first side surface and a second side surface opposite to the first side surface. The first light-shielding portion is electrically coupled to the cathode of the corresponding inorganic light-emitting element and prevents output of light traveling in a direction intersecting the first side surface of the inorganic light-emitting element.