Display Device With Reflective Pixel Isolation for Ultra-High Resolution
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Solution Overview
Problem
Existing display devices face challenges in preventing light beams from adjacent light-emitting areas from mixing, which affects the resolution and color accuracy of ultra-high resolution displays, particularly in head-mounted displays.
Innovation Solution
The display device incorporates a common electrode that surrounds each light-emitting element, acting as a common layer and applying a common voltage while reflecting light laterally to prevent mixing between adjacent light-emitting areas, and includes wavelength conversion layers and color filters to enhance light emission efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light-emitting elements are densely arranged to achieve ultra-high resolution, then display resolution is improved, but light beams from adjacent areas mix together degrading image quality
Solution Approach 1:
The display device divides the light-emitting area into separate pixel regions using partition walls, and surrounds each light-emitting element with a reflective layer. This segmentation prevents light beams from adjacent pixels from mixing together, enabling ultra-high resolution without sacrificing image quality.
Solution Approach 2:
A reflective layer is introduced as an intermediary component between the light-emitting elements and the surrounding structures. This reflective layer redirects light beams laterally to prevent them from spreading into adjacent areas, thereby maintaining light isolation in high-density arrangements.
2Adaptability or versatility
If a common electrode is added to apply common voltage to light-emitting elements, then electrical control is improved, but device structure becomes more complex
Solution Approach 1:
The common electrode is designed to serve multiple functions simultaneously: it applies common voltage to all light-emitting elements for electrical control, and also acts as a reflective surface to redirect light beams laterally. This multi-functionality improves electrical control without proportionally increasing structural complexity.
Solution Approach 2:
The common electrode is merged with the reflective layer in terms of material composition and functional integration. By combining these two functional layers, the device achieves both electrical control and light beam management functions with fewer distinct components, thereby reducing overall structural complexity.
3Measurement precision
If wavelength conversion layers and color filters are added to enhance color accuracy, then display quality is improved, but manufacturing process becomes more complex
Solution Approach 1:
Wavelength conversion layers and color filters are applied locally at specific positions corresponding to different color requirements. Rather than using uniform structures throughout, each region receives the appropriate wavelength conversion properties and color filter characteristics, achieving high color accuracy while maintaining manufacturing simplicity through localized processing.
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 achieves ultra-high resolution by preventing light leakage between adjacent areas, improving light emission efficiency, and ensuring accurate color reproduction, suitable for high-resolution displays in head-mounted devices.
Implementation Method 1
a first reflective layer on side surfaces of the plurality of light-emitting elements with the first insulating layer therebetween
Implementation Method 2
the common electrode is in contact with a portion of the side surface of each of the plurality of light-emitting elements
Implementation Method 3
the ultra-small light-emitting diode display panel may include a wavelength conversion layer to convert a wavelength of light emitting from the ultra-small light-emitting diode element to display various colors
Data Source
AI summary
A display device includes a first substrate, a plurality of light-emitting elements on the first substrate and spaced from each other, wherein each of the plurality of light-emitting elements extends in a thickness direction of the first substrate, a common electrode on the first substrate and the plurality of light-emitting elements, a first insulating layer on the common electrode and the plurality of light-emitting elements, and a first reflective layer on side surfaces of the plurality of light-emitting elements with the first insulating layer therebetween, wherein the common electrode is in contact with a portion of the side surface of each of the plurality of light-emitting elements.