Segmented Photon Recycling Cavity for Uniform Display Illumination
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Solution Overview
Problem
Existing display technologies lack uniform light output and efficient photon recycling, leading to non-ideal solutions in commercial and industrial applications.
Innovation Solution
A display system utilizing photon recycling cavities with indirect radiation from non-Lambertian emission and transflective materials, combined with segmented OLEDs and optical elements to redirect light for uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlighting solutions are used, then device complexity is reduced, but light output uniformity deteriorates
Solution Approach 1:
The display is divided into multiple segments, each with its own photon recycling cavity and LED. This segmentation allows independent optimization of light distribution in each zone, achieving uniform overall illumination while maintaining manageable structural complexity through modular design
Solution Approach 2:
A transflective layer is introduced as an intermediary element between the LED and the graphic opening. This layer reflects and transmits light to redistribute illumination uniformly across the display area, improving light output uniformity without significantly increasing overall device complexity
2Illumination intensity
If direct radiation from LEDs is used, then device complexity is minimized, but light distribution uniformity deteriorates
Solution Approach 1:
The patent transitions from direct 1D/2D light emission to 3D indirect radiation by introducing photon recycling cavities. Light travels through multiple paths and dimensions within the cavity, reflecting off walls and the transflective layer to achieve uniform distribution across the graphic opening
Solution Approach 2:
The transflective layer serves as an intermediary that converts non-uniform direct LED radiation into uniform indirect radiation. It reflects portions of light back into the cavity while transmitting other portions forward, creating a redistribution mechanism that achieves uniformity without complex optical components
3Illumination intensity
If photon recycling cavities with indirect radiation are used, then light output uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple functional elements are merged into integrated components: the photon recycling cavity walls, transflective layer, and LED mounting structure are combined into unified assemblies. This merging maintains the optical benefits of indirect radiation while simplifying manufacturing by reducing the number of separate parts and assembly steps
Solution Approach 2:
The manufacturing approach leverages parameter changes in material properties, such as using transflective materials with specific reflectivity and transmissivity characteristics. By selecting materials with optimized parameters, the complex optical function is achieved through material selection rather than complex structural design, easing manufacturing
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
Achieves aesthetically pleasing, uniform light distribution with reduced costs, enabling dynamic or static displays in various sectors, including automotive and retail.
Implementation Method 1
The first angular surface and the second angular surface redirecting light from the associated LED of the plurality of LEDs so that light from the plurality of light emitting diode is indirectly communicated through the graphic opening after reflecting from the first side angular surface and the second angular surface
Implementation Method 2
light from the plurality of light emitting diodes is indirectly communicated through the graphic opening after reflecting within the photon cavity
Data Source
AI summary
A display includes a first housing portion having graphic openings and a second housing portion spaced apart from the first housing portion. A first circuit board has LEDs and is disposed between the first and second housing portions. A first side wall and a second side wall define photon recycling cavities in a sequence wherein adjacent photon recycling cavities have a shared end wall an LED. The first side wall has a first angular surface and the second side wall has a second angular surface. The first angular surface and the second angular surface redirecting light from an associated LED of the plurality of LEDs so that light from the plurality of light emitting diode is indirectly communicated through the graphic openings after reflecting from the first angular surface and the second angular surface.