Backlight Scattering Element With High-Index Light Guide Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Passive electronic displays, such as LCDs, lack the ability to emit light, limiting their practical applications due to inherent low power consumption and limited use in various applications.
Innovation Solution
A backlight scattering element is introduced, comprising a light guide with a high-index light guide layer and a diffraction grating that diffractively scatters light, increasing scattering efficiency and enabling the display of multiview images with different perspectives by directing light in various angular directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional light guide is used in passive displays, then the display structure remains simple and manufacturing is easy, but the display lacks multiview functionality and cannot emit light in multiple directions
Solution Approach 1:
The patent combines the light guide layer and diffraction grating into a single integrated backlight scattering element. The high-index light guide layer is formed within the same structural framework as the diffraction grating, merging light guiding and light scattering functions into one component. This reduces the number of separate parts while achieving multiview functionality.
Solution Approach 2:
The backlight scattering element serves multiple functions simultaneously: it guides light from the light source, scatters light in multiple directions to create multiview functionality, and maintains optical efficiency. The high-index light guide layer and diffraction grating work together to perform both light guiding and angular scattering without requiring separate components.
2Productivity
If a high-index light guide layer is added to increase scattering efficiency, then multiview display performance improves, but manufacturing complexity increases
Solution Approach 1:
The patent changes the refractive index parameter of the light guide layer by introducing a high-index material or modifying the existing light guide material. This parameter change enables the light guide layer to effectively guide and scatter light, improving multiview display performance without fundamentally changing the manufacturing process.
Solution Approach 2:
The patent employs composite material structures by combining the high-index light guide layer with the diffraction grating in a single integrated element. This composite approach allows the system to achieve superior optical performance through material properties while maintaining a streamlined manufacturing process suitable for display production.
3Use of energy by moving object
If passive displays are used, then power consumption is low, but the displays cannot emit light and have limited practical applications
Solution Approach 1:
The patent introduces a backlight scattering element as an intermediary component that enables passive displays to achieve multiview functionality. This intermediary element allows the display to utilize ambient or backlight light more effectively, expanding practical applications without requiring the display to become an active light-emitting device.
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
The solution enhances the display capabilities of passive displays by providing a multiview functionality, allowing for the presentation of multiple views with directional light beams, effectively expanding their application in devices like smartphones, computers, and automotive consoles.
Implementation Method 1
a diffraction grating adjacent to the high-index light guide layer, the diffraction grating being configured to diffractively scatter out a portion of guided light from the light guide and high-index light guide layer as emitted light
Implementation Method 2
The light guide and high-index light guide layer are configured to guide light along a length of the light guide and high-index light guide layer
Data Source
AI summary
A backlight scattering element, multiview display, and method of backlight scattering element operation employ a high-index light guide layer in conjunction with a light guide and diffraction grating to provide emitted light. The backlight scattering element includes a light guide that guides light as guided light and a high-index light guide layer optically connected to the light guide and configured to extend a thickness of the light guide. The backlight scattering element also includes a diffraction grating adjacent to the high-index light guide layer to diffractively scatter out a portion of the guided light as emitted light. The multiview display includes a light guide having a first layer and a second layer, a refractive index of the second layer being greater than a refractive index of the first layer. The multiview display may modulate diffractively scattered out directional light beams to provide a multiview image.