Hologram Display Device Adaptive Light Source Control
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Solution Overview
Problem
Hologram-based stereoscopic imaging technology is limited by the viewing angle and image characteristics, which are determined by the geometrical features of the liquid crystal display panel, making it difficult to achieve a wide viewing angle effectively.
Innovation Solution
A hologram display device comprising a light source unit, a light guide plate, a spatial light modulator, and a sensing unit, where the light source unit includes multiple light sources that are selectively turned on based on the user's position, using optical systems to convert and focus light for optimal hologram image display across varying user positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid crystal display panel is used as the spatial light modulator, then the hologram image can be displayed, but the viewing angle is limited by the geometrical features of the panel
Solution Approach 1:
The light source unit is divided into multiple light sources (first light source, second light sources, third light sources) positioned at different locations. Each light source corresponds to a specific viewing angle range, allowing the system to segment the viewing space and provide optimized illumination for each sector, thereby expanding the overall viewing angle.
Solution Approach 2:
The light source driving unit dynamically selects which light sources to activate based on the detected user position. This dynamic adjustment allows the system to adapt to different viewing angles in real-time, maintaining optimal image quality across a wide viewing range without requiring a fixed complex optical system for all angles.
2Adaptability or versatility
If multiple light sources are used to expand viewing angle, then the viewing angle increases, but the control complexity increases
Solution Approach 1:
The sensing unit detects the user's position and provides feedback to the light source driving unit. Based on this feedback, the driving unit automatically determines which light sources should be activated. This closed-loop control system simplifies the management of multiple light sources by using real-time position information to automatically configure the optimal light source combination.
Solution Approach 2:
The light source driving unit serves multiple functions: it receives sensing information, processes position data, determines the appropriate viewing angle range, and controls the activation of corresponding light sources. This multi-functional controller reduces the need for separate control systems for each light source, thereby managing complexity.
3Reliability
If the light source position is fixed, then the device structure is simple, but the image quality degrades when user position changes
Solution Approach 1:
While individual light source positions remain fixed for structural simplicity, the system dynamically selects which fixed positions to activate based on user location. This dynamic selection allows the system to maintain optimal image quality for different viewing angles without requiring physically movable light sources, thus preserving structural simplicity while achieving adaptability.
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 device enhances the viewing angle and maintains image quality by adaptively adjusting light sources and optical systems to accommodate user movement, reducing eye fatigue and improving the overall hologram display experience.
Implementation Method 1
the light guide plate converts the light emitted thereto from the light source unit to a planar light beam
Implementation Method 2
the first optical system may be disposed between the light guide plate and the light source unit, may convert the light emitted thereto from the light source unit to a collimated beam
Implementation Method 3
the second optical system may focus the planar light beam output from the light guide plate
Implementation Method 4
the spatial light modulator spatially modulates the planar light beam to produce a hologram image
Data Source
AI summary
A hologram display device includes a light source unit, a light guide plate, a spatial light modulator, a sensing unit, and a light source driving unit. The light source unit includes a plurality of light sources and emits light when at least one of the plurality of light sources is turned on. The light guide plate converts the light emitted thereto from the light source unit to a planar light beam. The spatial light modulator spatially modulates the planar light beam to produce a hologram image. The sensing unit senses a position of a user watching the hologram image, and the light source driving unit turns on the at least one of the plurality of light sources, based on information on the position of the user obtained by the sensing unit.