Multiview Backlight Color-Tailored Emission Pattern
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Solution Overview
Problem
Passive displays, such as LCDs and EP displays, lack the ability to emit light, limiting their practical applications, and existing backlight solutions often suffer from color breakup issues due to the finite size of color filters or light sources.
Innovation Solution
A multiview backlight system employing a color-tailored multibeam element with a diffraction grating that emits light beams with different principal angular directions, providing a color-tailored emission pattern to illuminate multiview displays, mitigating color breakup by ensuring directional light beams of different colors are parallel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlights with color filters are used to provide color illumination for displays, then color display capability is achieved, but color breakup occurs due to the finite size of color filters or light sources
Solution Approach 1:
The patent segments the backlight system into multiple independent light sources, each emitting a specific color (red, green, blue) and positioned at different lateral locations. This segmentation allows each light source to be optimized for its specific color without the need for large color filters, thereby eliminating color breakup while maintaining color display capability
Solution Approach 2:
The patent applies local quality by assigning different colors to different spatial locations within the backlight. Each light source emits a specific color at a specific lateral position, creating a spatially differentiated color distribution that matches the requirements of the display pixels, thus avoiding color misalignment and breakup
2Adaptability or versatility
If passive displays are coupled with external light sources to enable light emission, then the displays can function as active displays, but the device complexity increases
Solution Approach 1:
The patent employs self-service by using light-emitting diodes (LEDs) that directly emit the required colors without needing external color conversion components. The LEDs themselves provide the color filtering function through their inherent emission characteristics, eliminating the need for separate color filters and reducing overall system complexity
Solution Approach 2:
The patent merges multiple functions into the light sources themselves. The LEDs simultaneously provide illumination, color filtering, and spatial positioning functions, eliminating the need for separate components and simplifying the overall backlight system architecture
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 effective color backlighting for multiview displays, enhancing their application in devices like smartphones and computer monitors by eliminating color breakup and providing a more efficient light distribution.
Implementation Method 1
a multibeam diffraction grating configured to couple out a portion of the guided light beams as a plurality of light beams having different principal angular directions representing the different 3-D views
Data Source
Figure 1A~1B
Figure 2~3A
Figure 3B~3C
AI summary
Multiview backlighting having a color-tailored emission pattern provides directional light beams corresponding to a plurality of different views of a multiview image. A multiview backlight includes a light guide configured to guide light as guided light and a color-tailored multibeam element. The color-tailored multibeam element is configured to provide emitted light having the color-tailored emission pattern from the guided light. The emitted light includes a plurality of directional light beams having different principal angular directions corresponding to respective different view directions of a multiview display. The color-tailored emission pattern corresponds to an arrangement of color sub-pixels of a view pixel in the multiview display.