Multi-directional Backlight for Multi-user Multiview Display
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Solution Overview
Problem
Passive electronic displays, such as LCDs, lack the ability to emit light, limiting their practical applications due to their inherent low power consumption and limited use in many applications.
Innovation Solution
A multi-directional backlight system comprising multiple multiview backlights oriented at different angles, employing multibeam emitters to provide directional light beams with distinct principal angular directions, enabling the creation of a 'glasses-free' or autostereoscopic 3D display by modulating light to represent different views of a multiview image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If passive displays like LCDs are used, then power consumption is low, but the ability to emit light is lost
Solution Approach 1:
The patent introduces a light guide plate as an intermediary component that redirects light from edge-mounted LEDs to illuminate the display surface uniformly. This allows passive LCDs to achieve adequate brightness without requiring high-power front-lit LED arrays, thus maintaining low power consumption while enabling sufficient light emission for display visibility
Solution Approach 2:
The patent replaces the traditional electrical lighting system (front-lit LEDs) with an optical redistribution system (edge-lit LEDs + light guide plate). This substitution achieves the same illumination function with lower power consumption by using optical geometry and material properties rather than high-power light sources
2Adaptability or versatility
If traditional single-view displays are used, then device complexity is low, but adaptability to different viewing conditions is limited
Solution Approach 1:
The patent segments the display into multiple viewing zones, each with its own set of virtual pixels and light field parameters. This allows different users to simultaneously view different perspectives or content on the same physical display area, achieving multi-view capability through spatial segmentation of the light field rather than requiring multiple physical displays
Solution Approach 2:
The patent adds a spatial dimension to traditional 2D displays by creating a light field with depth information. By controlling light rays in three-dimensional space (position, angle, and convergence distance), the display achieves volumetric visualization capability, allowing users to perceive 3D images and multiple perspectives without adding multiple physical display layers
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 the display of 3D information with multiple viewing zones, providing distinct perspectives without the need for glasses, enhancing the usability of passive displays in various devices like smartphones, computers, and automotive consoles.
Implementation Method 1
The light guide may comprise a planar, substantially transparent plate configured to redirect light incident on a first surface of the plate away from a normal of the first surface
Implementation Method 2
The diffraction grating may comprise a plurality of diffractive features spaced apart from one another by a diffractive feature spacing configured to provide diffractive coupling out of the guided light portion
Data Source
AI summary
A multi-directional backlight and a multi-user multiview display provide emitted light and associated multiview images having different mutually exclusive angular ranges and different user-specific view zones. The multi-directional backlight includes first and second multiview backlights, each of which includes multibeam elements configured to provide emitted light having directional light beams with directions corresponding to view directions of a respective multiview images. The emitted light provided by the first multiview backlight has a first angular range that is mutually exclusive of a second angular range of emitted light provided by the second multiview backlight, at respective first and second convergence distances. The multi-user multiview display includes a first multiview display configured to provide a first multiview image to a first user in a first view zone and a second multiview display configured to provide a second multiview image to a second user in a second view zone.