Rotatable Light Guide Plate for Dynamic Holographic Viewing Area
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Solution Overview
Problem
Current 3D image display technologies using binocular parallax can cause eye fatigue and have limited natural 3D effects due to narrow viewing angles, which are not adaptable to viewer movement, and holographic displays face limitations in viewable area due to fixed light direction control.
Innovation Solution
A backlight unit with a light source unit and diffraction device that adjusts light direction, integrated with a spatial light modulator and eye-tracking sensor to dynamically control light emission based on viewer position, allowing for adjustable viewing angles and enhanced 3D image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a holographic display uses a fixed light direction control, then the device structure is simple, but the viewing angle is narrow and the viewable area is limited
Solution Approach 1:
The patent applies dynamics by making the light guide plate rotatable around its longitudinal axis, allowing the holographic display to dynamically adjust the viewing area location according to viewer position. The light guide plate can be rotated to different angles (e.g., 0°, 45°, 90°, 135°) to redirect light and shift the viewing area to different quadrants of the display screen, thereby increasing adaptability without requiring multiple fixed displays
Solution Approach 2:
The light guide plate serves multiple functions: it guides light from the light source, diffracts light through the holographic pattern, and acts as a rotatable beam steering element. By integrating these functions into a single rotatable component, the system achieves multi-functionality that increases viewing angle flexibility while avoiding the need for separate components for each function
2Adaptability or versatility
If a holographic display has a narrow viewing angle, then the device complexity is low, but the natural 3D effect is limited
Solution Approach 1:
The system dynamically adjusts the light direction by rotating the light guide plate based on detected viewer position. This dynamic adjustment allows the holographic display to maintain a natural 3D effect regardless of viewer movement, as the viewing area is continuously repositioned to align with the viewer's location, eliminating the limitations of fixed viewing angles
3Adaptability or versatility
If the viewing area location is fixed, then the control system is simple, but the display cannot adapt to viewer movement
Solution Approach 1:
The system employs feedback through an imaging device (camera) that detects viewer position and provides this information to the control circuit. The control circuit processes the viewer position data and generates control signals to rotate the light guide plate to the appropriate angle, creating a closed-loop feedback system that enables real-time adaptation to viewer movement
Solution Approach 2:
The patent replaces complex mechanical multi-display systems with a single rotatable light guide plate mechanism. Instead of using multiple fixed holographic displays positioned at different angles, the system uses one light guide plate that can be rotated to different angular positions, substituting a simple rotational mechanical system for what would otherwise require multiple static display units
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
This solution increases the viewing angle and natural 3D effect by dynamically adjusting the light direction and viewing area according to the viewer's position, reducing eye fatigue and improving the overall display experience.
Implementation Method 1
The beam steering unit may include: a mirror that reflects light emitted from the at least one light source to be incident on the light guide plate
Implementation Method 2
The beam steering unit may include: a refraction surface that refracts light emitted from the at least one light source to be incident on the light guide plate
Implementation Method 3
a diffraction device which is disposed on the light guide plate and configured to control a direction of light emitted from the light guide plate
Implementation Method 4
The active optical element may include a first medium and a second medium which are stacked on each other and form the refraction surface over which the first medium and the second medium contact. The tilt angle of the refraction surface may be controlled by a voltage applied to the active optical element
Data Source
AI summary
Provided are a backlight unit and a holographic display including the same. The backlight unit may include: a light guide plate; a light source unit configured to adjust a direction of light which is emitted from the light source unit and incident on the light guide plate; and a diffraction device which is disposed on the light guide plate and configured to control a direction of light emitted from the light guide plate.