Photon Recycling Cavity for Uniform Indirect Display Illumination
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Solution Overview
Problem
Existing display technologies struggle to achieve uniform light distribution across displayed materials, particularly in commercial and automotive applications, leading to aesthetically suboptimal results.
Innovation Solution
The use of a photon recycling cavity in conjunction with addressable LED light sources, including 360-degree side emitting diodes and segmented OLEDs, to indirectly communicate light through graphic openings after reflection within the cavity, ensuring uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If direct radiation from LED light sources is used to illuminate displayed materials, then the light output is strong and energy-efficient, but the light distribution is non-uniform and aesthetically suboptimal
Solution Approach 1:
A transreflective medium is introduced as an intermediary between the LED light source and the displayed material. This medium receives direct radiation from the LED and converts it into indirect radiation through reflection and transmission, achieving uniform light distribution while maintaining energy efficiency. The transreflective medium acts as a mediator that transforms the non-uniform direct light into uniform indirect light.
Solution Approach 2:
The patent transitions from direct one-dimensional light propagation to multi-dimensional indirect radiation through the transreflective medium. By utilizing reflective and transmissive properties in multiple directions, the system achieves uniform illumination across the displayed material, converting a linear light path into a multi-dimensional light distribution pattern.
2Manufacturing precision
If uniform light distribution is achieved through traditional diffusers or reflectors, then the illumination is even, but the device complexity and cost increase
Solution Approach 1:
The transreflective medium performs multiple functions simultaneously: it reflects light in certain directions, transmits light in other directions, and diffuses light to achieve uniform distribution. This multi-functional approach eliminates the need for separate diffusers, reflectors, and lenses, thereby reducing device complexity while maintaining uniform illumination.
Solution Approach 2:
The patent changes the optical parameters of the medium by using materials with specific transreflective properties. By adjusting the reflective and transmissive parameters of the medium, uniform light distribution is achieved without requiring complex structural modifications or additional optical components.
3Use of energy by moving object
If non-Lambertian emission from LEDs is used, then the light output is directional and efficient, but the light cannot be evenly distributed across the display area
Solution Approach 1:
The transreflective medium serves as an intermediary that receives directional non-Lambertian emission from the LED and converts it into uniform indirect radiation. The medium preserves the energy efficiency of directional LED emission while achieving even light distribution through its reflective and transmissive properties.
Solution Approach 2:
The patent utilizes the optical properties of the transreflective medium to transform the spectral and angular characteristics of the LED emission. By manipulating the optical parameters of the medium, the directional non-Lambertian light is converted into uniform indirect radiation with desired distribution characteristics.
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 a uniform and aesthetically pleasing light distribution across displayed materials, improving the visual impact of digital signatures, architectural lighting, and vehicle displays while potentially reducing costs.
Implementation Method 1
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 therein, a second housing portion spaced apart from the first housing portion and a first circuit board having a plurality of light emitting diodes. The first circuit board is disposed between the first housing portion and the second housing. The first housing portion and the second housing portion form a first photon recycling cavity having the plurality of light emitting diodes disposed therein so that light from the plurality of light emitting diodes is indirectly communicated through the graphic opening after reflecting within the photon cavity.