Directional Light Emitters for Private Display Viewing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional direct view flat panel displays struggle to provide directional light emission, limiting their ability to display different images when viewed from various angles and failing to offer secure or private content presentation.
Innovation Solution
The use of arrays of small directional light emitters, each pixel composed of multiple emitters directing light into different viewing directions, along with a combination of directional and isotropic emitters, allows for light field displays that can present different images based on viewer location and adjust content dynamically using eye-tracking and beam steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional isotropic LEDs are used to generate images, then multiple viewers can view the same displayed image from various locations, but the display cannot present different images when viewed from different directions and cannot provide secure or private content presentation
Solution Approach 1:
Each pixel is divided into multiple subpixels, and each subpixel is further divided into multiple light emitters (including both directional and isotropic emitters). This segmentation allows different emitters to contribute to different viewing directions, enabling the display to present different images to viewers at different locations while maintaining manageable complexity through modular subpixel design
Solution Approach 2:
Different types of light emitters (directional and isotropic) are distributed within each subpixel according to their specific functional requirements. Directional emitters are positioned and oriented to provide light to specific viewing directions, while isotropic emitters provide omnidirectional light. This local differentiation of emitter quality enables directional light emission capability without requiring complete redesign of the entire pixel structure
2Adaptability or versatility
If arrays of small directional light emitters are used to enable different images from different viewing directions, then secure and private content presentation is achieved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The pixel structure is segmented into multiple subpixels, each containing a controlled arrangement of directional and isotropic light emitters. This segmentation allows for standardized manufacturing modules that can be replicated across the display, reducing overall manufacturing complexity despite the sophisticated emitter arrangements required for viewing angle control
Solution Approach 2:
The directional light emitters serve multiple functions: they provide light to specific viewing directions for secure content presentation, enable different images to be displayed to different viewers, and contribute to the overall image generation process. This multi-functionality reduces the need for separate specialized components, simplifying the overall manufacturing process
3Adaptability or versatility
If multiple directional emitters are arranged in each pixel to direct light into different viewing directions, then light field displays can present different images when viewed from different directions, but the manufacturing precision requirements increase
Solution Approach 1:
By dividing each pixel into multiple subpixels and each subpixel into multiple light emitters, the positioning requirements for each individual emitter are reduced. The segmented structure allows for greater tolerance in emitter placement while still achieving the desired light direction control through the collective contribution of multiple emitters in each subpixel
Solution Approach 2:
Each light emitter is designed with specific local characteristics (directional or isotropic emission patterns) that are optimized for its particular position and function within the subpixel. This local optimization allows each emitter to perform its specific directional control function effectively, reducing the need for extremely high precision in the overall emitter arrangement
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
Enables the creation of light field displays that can project different light fields into various viewing directions, maintaining resolution and allowing for secure, private content presentation without the need for wearable devices.
Implementation Method 1
the directional emitters are composed of resonant cavity emitters in which a small light source, such as a micro-light emitting diode (μLED) is incorporated within an optical cavity that enhances emission into a narrow range of angles
Implementation Method 2
Alternatively, or additionally, photonic crystal layers can also be used to inhibit propagation of certain modes from an emitter, providing directional emission
Implementation Method 3
a light emitting diode layer, extending in a plane perpendicular to the first direction, having a thickness of 10 microns or less in the first direction and a maximum lateral dimension of 100 microns or less orthogonal to the first direction, the light emitting diode layer including a semiconductor material
Data Source
AI summary
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for changing a distributed mode loudspeaker's fundamental frequency. One of the systems may include a light emitting diode display that includes an array of pixels, each pixel including, for each color of multiple colors, a directional light emitter and a wide-angle light emitter, a first combination of all the directional light emitters configured to generate a first display image viewable within a first viewing angle, and a second combination of all the wide-angle light emitters configured to generate a second display image concurrently with the generation of the first display image that is viewable within a second viewing angle. The first display image is a different image than the second display image and the first viewing angle is a narrower viewing angle than, and included within, the second viewing angle.