Holographic Display Spatial Impression Unit Brightness Control
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Solution Overview
Problem
Conventional holographic image display devices using half-mirror film type screens are bulky, have limited configuration freedom, and suffer from unclear images in high ambient illumination, while transmissive screens fail to provide a clear holographic image due to brightness issues.
Innovation Solution
A holographic image display device incorporating a spatial impression providing unit made of colored transparent material, which allows the holographic image to be seen through while appearing as a colored background, reducing ghost phenomena and enhancing viewing angles, and includes an illuminance sensor and control unit to adjust luminance based on ambient light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a half-mirror film type screen is employed to create a pseudo hologram, then a hologram-like effect can be produced, but the device volume increases and configuration freedom is reduced
Solution Approach 1:
The patent removes the half-mirror film screen from the system entirely, replacing it with a different optical approach using a transmissive screen and specific lighting arrangement. This extraction eliminates the need for the bulky half-mirror component while maintaining the pseudo-holographic effect through alternative means.
Solution Approach 2:
The transmissive screen serves multiple functions: it displays the holographic image, allows ambient light transmission, and works with various lighting conditions. This multi-functionality replaces the specialized half-mirror screen, reducing device complexity and volume while maintaining effectiveness across different configurations.
2Reliability
If a half-mirror film type screen is employed to create a pseudo hologram, then a hologram-like effect can be produced, but the degree of freedom of configuration is lower
Solution Approach 1:
By removing the half-mirror film screen constraint, the system gains configuration freedom. The transmissive screen approach allows flexible positioning and orientation without the rigid angular requirements of half-mirror screens, enabling broader adaptability in device placement and viewing arrangements.
3Shape
If a transmissive screen is employed to display the holographic image, then the screen can be transparent, but the holographic image is not seen clearly in high ambient illumination
Solution Approach 1:
The patent applies different optical properties to different regions: the transmissive screen maintains transparency for general light transmission, while the holographic image area receives enhanced illumination from LEDs positioned behind the screen. This local quality differentiation ensures the image remains visible and clear even in high ambient light conditions.
Solution Approach 2:
LEDs are positioned behind the transmissive screen in advance to provide pre-illumination of the holographic image area. This preliminary lighting action ensures that when ambient illumination is high, the image area is already sufficiently lit to maintain visibility and clarity against the bright background.
4Reliability
If the background of the holographic image is made colored using transparent material, then the holographic image can be seen clearly in bright environments, but the device complexity increases
Solution Approach 1:
The spatial impression providing unit is made of colored transparent material that imparts a color tint to the background space. This coloration enhances image visibility in bright environments by creating contrast between the holographic image and the colored background, while the transparent nature of the material prevents significant added 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
Enables clear recognition of the holographic image even in bright environments, reduces ghost effects, and provides a wider viewing angle compared to conventional devices.
Implementation Method 1
a spatial impression providing unit configured to form a space surrounding the holographic image, the spatial impression providing unit comprising a colored transparent material which allows the holographic image to be seen through the spatial impression providing unit from outside while allowing the space to be seen colored
Data Source
AI summary
A holographic image display device according to one embodiment comprises: an image display unit on which a holographic image is displayed; and a spatial impression providing unit which forms a space surrounding the holographic image, and includes a transparent color material such that the space looks colored and the holographic image can be recognized from the outside.