Optical Patterned LED Display Pixels for Higher Light Extraction
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Solution Overview
Problem
Existing display devices face challenges in enhancing light output efficiency, particularly in the arrangement and connection of light emitting diodes (LEDs) with electrodes, which affect durability and performance under various environmental conditions.
Innovation Solution
A display device design incorporating a substrate with pixel areas, including first and second electrodes, light emitting elements, and an optical pattern or layer to extract and manage light emission, with optional encapsulation and insulating layers to enhance light output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting elements are connected to electrodes to enable voltage application, then the LED can function in display devices, but the space required for electrode arrangement increases
Solution Approach 1:
The patent implements nested connections where the first electrode connects to one end of the light emitting element and the second electrode connects to the other end, with additional electrodes nested within the same pixel structure. This allows multiple electrical connections to be made in a compact arrangement, reducing the overall space required while maintaining full LED functionality.
Solution Approach 2:
The patent transitions from planar electrode arrangements to three-dimensional vertical stacking, where electrodes are positioned at different heights and depths within the pixel structure. This dimensional change allows multiple electrodes to occupy overlapping footprints in the planar view, significantly reducing the area required for electrode arrangement while enabling proper electrical connections.
2Productivity
If optical patterns are added to extract light from light emitting elements, then light output efficiency is improved, but device complexity increases
Solution Approach 1:
The optical pattern layer serves multiple functions simultaneously: it extracts light from the light emitting elements, diffuses the extracted light for uniform distribution, and can be integrated with the encapsulation layer for protection. This multi-functionality improves light output efficiency while minimizing the increase in device complexity by combining several functions into a single integrated layer.
Solution Approach 2:
The patent merges the optical pattern layer with the encapsulation layer, where the encapsulation material itself is formed with optical patterns rather than adding a separate complex optical component. This integration reduces the number of discrete layers and simplifies the manufacturing process while maintaining the light extraction and diffusion functions.
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 design improves light output efficiency by diffusing and concentrating light emitted from LEDs, thereby enhancing the overall performance and durability of the display device.
Implementation Method 1
The optical pattern may include light diffusion particles
Implementation Method 2
the optical pattern may be a lens
Data Source
AI summary
A display device in accordance with one or more embodiments may include: a substrate including a display area including a plurality of pixel areas, each of the plurality of pixel areas including an emission area, and a non-display area at at least one side of the display area; and a pixel in each of the plurality of pixel areas. The pixel may include: a first electrode and a second electrode spaced from each other on the substrate; a plurality of light emitting elements connected between the first and the second electrodes; and an optical pattern on the plurality of light emitting elements and overlapping at least some of the plurality of light emitting elements. The optical pattern is configured to extract light emitted from the plurality of light emitting elements.