Multibeam Backlight Diffraction Grating Filling Fraction
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Solution Overview
Problem
Passive electronic displays, such as LCDs and EP displays, face limited practical applications due to their inability to emit light, which restricts their use in various applications where active light emission is required.
Innovation Solution
A multibeam backlight system utilizing a diffraction grating with a controlled filling fraction of diffractive features is employed to provide directional light beams, enabling efficient light distribution and emission, suitable for multiview displays that offer different views in various directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffraction grating with high filling fraction is used, then light emission intensity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by systematically varying the filling fraction of the diffraction grating to optimize light emission intensity. By adjusting this critical parameter, the system achieves high illumination intensity while maintaining manufacturability through controlled variations rather than requiring absolute precision at fixed values.
Solution Approach 2:
The patent introduces dynamic control mechanisms that allow the filling fraction to be adjusted during manufacturing processes. This dynamic approach enables real-time optimization of light emission intensity while accommodating normal manufacturing variations, thereby reducing the stringency of precision requirements.
2Use of energy by moving object
If passive display technology is used, then power consumption is reduced, but light emission capability is lost
Solution Approach 1:
The patent introduces an intermediary light emission mechanism (diffraction grating system) that enables passive display technologies to achieve controlled light emission. This intermediary component allows the display to emit light in specific directions without requiring active light sources, thus maintaining low power consumption while regaining light emission capability.
Solution Approach 2:
The patent replaces traditional active light emission mechanisms with an optical field-based approach using diffraction gratings. This substitution eliminates the need for energy-intensive light sources while achieving directional light emission through optical field manipulation, thereby reducing power consumption while maintaining light emission capability.
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 multibeam backlight system enhances light emission efficiency and versatility, allowing for broader application in devices like smartphones, computers, and automobile consoles by providing directional light beams that can be modulated for multiview displays.
Implementation Method 1
a diffraction grating configured to diffract incident light into a plurality of directional light beams
Data Source
AI summary
A multibeam backlight and multiview display employ a filling fraction of a diffraction grating to control diffractive scattering efficiency. The multibeam backlight includes a light guide configured to guide light and a plurality of multibeam elements, a multibeam element of the multibeam element plurality including a diffraction grating. The multibeam element is configured to diffractively scatter a portion of the guided light out of the light guide as directional light beams having different directions corresponding to different view directions of a multiview display. A filling fraction of diffractive features within the diffraction grating is configured to control a diffractive scattering efficiency of the multibeam element. The multiview display further includes an array of light valves configured to modulate the directional light beams to provide a multiview image. The filling fraction may be a ratio of diffractive features to filling features within the diffraction grating.