Dual-Sided Display Using Segmented Micro LEDs
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Solution Overview
Problem
Dual-sided displays face challenges in achieving a light and thin design while preventing mirror image formation, where only one side of the display shows an accurate image without the viewer seeing a mirror image.
Innovation Solution
The dual-sided display incorporates two micro light emitting devices that emit light in opposite directions and can be separately controlled, with a patterned photoresist layer and reflective electrode configuration to guide light to each side independently, preventing interference and ensuring accurate image viewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a dual-sided display is designed to be thin and lightweight, then the display achieves a light and thin design, but it becomes difficult to prevent mirror image formation and guide light independently to each side
Solution Approach 1:
The display is segmented into two independent light emitting systems: a first micro light emitting device for emitting light in a first direction, and a second micro light emitting device for emitting light in a second direction opposite to the first direction. This segmentation allows each device to independently control light emission to its respective side, preventing mirror image formation while maintaining thin display thickness.
Solution Approach 2:
Different regions of the display have different light emitting properties. The first micro light emitting device is configured to emit light primarily in the first direction toward the first side, while the second micro light emitting device emits light primarily in the second direction toward the second side. This local quality differentiation ensures that each side receives light from its dedicated light emitting device, eliminating mirror image interference.
2Adaptability or versatility
If two micro light emitting devices are used to emit light in opposite directions, then dual-sided displaying is enabled, but the device complexity increases
Solution Approach 1:
The first and second micro light emitting devices are integrated within the same display structure, sharing common elements such as the substrate and control circuitry. This merging approach enables dual-sided displaying capability while minimizing the increase in overall device complexity by consolidating shared components rather than creating entirely separate systems.
Solution Approach 2:
Instead of expanding the display horizontally with separate light emitting devices on each side, the invention utilizes the vertical dimension by configuring light emitting devices to emit light in opposite directions (first direction and second direction). This dimensional approach allows dual-sided displaying within a compact footprint, reducing structural complexity.
3Adaptability or versatility
If light is emitted in opposite directions from the same location, then dual-sided content display is achieved, but light interference may occur between the two sides
Solution Approach 1:
The first micro light emitting device is optimized to emit light with higher intensity in the first direction, while the second micro light emitting device is optimized to emit light with higher intensity in the second direction. This directional light emission optimization ensures that each side predominantly receives light from its dedicated device, minimizing light interference between sides while achieving dual-sided content display.
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 configuration allows for a thin and efficient dual-sided display design that prevents mirror image formation, enabling accurate image viewing on one side while allowing the other side to be used for lighting or additional content, enhancing display functionality.
Implementation Method 1
a reflective electrode, and a second micro light emitting device, wherein the patterned photoresist layer has a first opening and a second opening, the reflective electrode is coupled to the first micro light emitting device through the first opening, and the reflective electrode covers a substrate that is exposed at the second opening
Data Source
AI summary
A dual-sided display is disclosed, including a substrate, a first active device, a first micro light emitting device, a patterned photoresist layer, a reflective electrode, a second micro light emitting device, a protective layer, and a first conductive electrode. The first micro light emitting device is disposed on the substrate and electrically connected to the first active device. The patterned photoresist layer is disposed on the substrate and covers a portion of the first micro light emitting device. The reflective electrode covers the patterned photoresist layer and a portion of the substrate. The second micro light emitting device is disposed on the reflective electrode. The protective layer covers the reflective electrode and a portion of the second micro light emitting device. The first conductive electrode covers the protective layer and is electrically connected to the second micro light emitting device.