Tileable MicroLED Array Layout for Seamless Transparent Displays
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Solution Overview
Problem
Current LED and pcLED technologies face limitations in scalability and transparency, making it difficult to create large, continuous displays with uniform pitch and high transmissivity, which is essential for applications like augmented-reality, virtual-reality, and mixed-reality systems.
Innovation Solution
The solution involves designing display devices with microLED arrays that extend to the physical boundaries of the device, allowing multiple devices to be tiled together to form a continuous array while maintaining a consistent center-to-center pitch distance, and using transparent substrates and conductive paths to ensure high transmissivity and unobstructed views.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If microLED arrays are extended to physical boundaries of the device, then the display area can be tiled to form large continuous displays, but manufacturing precision and alignment become more difficult
Solution Approach 1:
The display device is divided into multiple tileable units, each with microLED arrays extending to physical boundaries. This segmentation allows large continuous displays to be constructed by tiling multiple smaller units together, maintaining manufacturing feasibility while achieving large display areas.
Solution Approach 2:
The microLED arrays are configured with specific pitch distances (e.g., L/2 from boundaries) that are optimized for tiling applications. This local quality adjustment at the boundaries ensures that when tiles are assembled, the pitch consistency is maintained across tile junctions, resolving the manufacturing precision challenge.
2Illumination intensity
If transparent substrates and conductive paths are used to ensure high transmissivity, then visual clarity is improved, but device complexity increases
Solution Approach 1:
Transparent substrates and thin conductive paths are used to create the display structure. These thin film elements provide the necessary electrical connectivity and structural support while maintaining high transmissivity for visual clarity, effectively managing the trade-off between transparency and 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
This approach enables the construction of large, transparent, and continuous microLED displays with consistent pitch, overcoming manufacturing limitations and allowing for seamless integration into various applications, including AR, VR, and MR systems, while maintaining high transmissivity and visual clarity.
Implementation Method 1
Semiconductor light emitting diodes and laser diodes (collectively referred to herein as 'LEDs') are among the most efficient light sources currently available. The emission spectrum of an LED typically exhibits a single narrow peak at a wavelength determined by the structure of the device and by the composition of the semiconductor materials from which it is constructed.
Implementation Method 2
LEDs may be combined with one or more wavelength converting materials (generally referred to herein as 'phosphors') that absorb light emitted by the LED and in response emit light of a longer wavelength.
Data Source
AI summary
Display devices comprise an optionally transparent display area that extends to one or more physical boundaries (edges) of the device. The display area may be located on a front surface of the display device, and the physical boundaries of the device to which the display area extends may be formed by physical sides of the device that intersect with the front surface to define part of a perimeter of the front surface. The display area may comprise a microLED array that extends with the display area to edges of the device. Power and/or control electronics for the display device may be located adjacent the display area but away from the edges of the display device to which the display area extends. Two or more such display devices can be arranged (i.e., tiled) with their display areas adjacent, in contact, and facing the same direction to form an extended continuous microLED display area spanning the display areas of the two or more display devices.