Multiview Backlight Apertures for 2D/3D Mode Switching
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Solution Overview
Problem
Passive electronic displays, such as LCDs and EP displays, lack the ability to emit light, limiting their practical applications, and existing solutions like backlights often suffer from color separation issues and non-uniform brightness.
Innovation Solution
A multiview backlight system with a planar light guide and a light-blocking layer featuring apertures that emit directional light beams corresponding to different view directions, enabling 2D/3D mode-switchable displays with improved brightness uniformity and color separation, using a white light source and prism films for collimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a traditional backlight is used to illuminate passive displays, then the displays can emit light and function as active displays, but color separation issues and non-uniform brightness occur
Solution Approach 1:
The backlight is segmented into multiple independent light sources (first backlight and second backlight) positioned at different locations. Each backlight illuminates specific regions of the display, allowing independent control of illumination zones to achieve uniform brightness across the entire display surface while preventing color separation through spatial distribution
Solution Approach 2:
Different backlights provide different local illumination characteristics - the first backlight provides illumination from a first location while the second backlight provides illumination from a second location. This local quality differentiation ensures that each region receives optimized lighting, achieving overall brightness uniformity without color separation artifacts
2Illumination intensity
If multiple backlights are used to improve brightness uniformity, then illumination uniformity improves, but device complexity increases
Solution Approach 1:
Multiple backlights are merged into a single integrated backlight assembly where the first backlight and second backlight work together as a unified system. This combining approach achieves brightness uniformity through coordinated illumination while maintaining a compact, integrated structure that does not significantly increase overall device complexity
Solution Approach 2:
The backlight assembly serves multiple functions simultaneously - the first backlight and second backlight together provide both edge illumination and surface illumination, achieving uniform brightness across the display while maintaining a single, multi-functional component structure that reduces overall system complexity
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 system allows for a single display to adapt to various data presentation requirements by switching between 2D and 3D modes, offering improved brightness uniformity and mitigating color separation issues, enhancing the functionality of passive displays.
Implementation Method 1
a light guide configured to guide light from the light source and scatter the guided light
Implementation Method 2
scatter the guided light
Implementation Method 3
using a white light source and prism films for collimation
Data Source
AI summary
A multiview backlight and mode-switchable backlight employ a planar backlight to emit scattered light and light-blocking layer having a plurality of apertures to provide a plurality of directional light beams from the scattered light. The mode-switchable backlight further includes another planar backlight configured to provide diffuse light in a two-dimensional (2D) operational mode, the plurality of directional light beams being provided in a three-dimensional (3D) mode. A 2D/3D mode-switchable display includes the mode-switchable backlight and a light valve array. A method of backlight operation includes directing scattered light from a planar backlight toward a light-blocking layer having a plurality of apertures and providing a plurality of directional light beams using an aperture of the aperture plurality.