Hologram Display Optical Path Switching for Uniform Luminance
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Solution Overview
Problem
Hologram display technologies face challenges with a narrow viewing window due to the large gap between pixels in liquid crystal spatial light modulators, leading to uneven light distribution between the left and right eyes, which affects the visibility and reliability of the hologram.
Innovation Solution
A dynamic prism system is implemented to detect the viewer's position and refract light accordingly, with an optical path switching unit using a liquid crystal unit to adjust the light path and compensate for light loss differences between the left and right eyes, ensuring uniform luminance and a wider viewing window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a liquid crystal spatial light modulator is used to display a hologram, then the hologram can be displayed without wearing glasses, but the large gap between pixels causes a narrow viewing window
Solution Approach 1:
The viewing window is segmented into multiple regions corresponding to different viewer positions. The optical path switching unit divides the light into multiple paths, each directed to a specific viewing region, thereby expanding the overall viewing window while maintaining glasses-free operation
Solution Approach 2:
The patent transitions from a two-dimensional pixel array to a three-dimensional optical path control system. By introducing the optical path switching unit with multiple layers and angles, the viewing window is expanded in the angular dimension, allowing viewers at different positions to see the hologram without glasses
2Area of stationary object
If a prism is provided to widen the viewing window, then the viewing window can be widened, but light loss occurs due to different refraction directions for left and right eyes
Solution Approach 1:
The system uses detectors to detect viewer position and provides feedback to the controller. Based on this feedback, the optical path switching unit dynamically adjusts the light distribution to compensate for losses in different viewing directions, ensuring uniform luminance across the expanded viewing window
Solution Approach 2:
The patent dynamically changes optical parameters such as refraction angles and light intensity distribution based on detected viewer position. By adjusting these parameters in real-time, the system compensates for light loss while maintaining an expanded viewing window
3Area of stationary object
If the prism refracts light with different grades for left and right eyes, then the viewing window can be optimized for each eye, but the amount of light incident on each eye becomes uneven
Solution Approach 1:
The optical path switching unit applies different optical properties to different spatial regions. Each region is optimized for specific viewing angles and eyes, with local adjustments to light intensity and direction that maintain overall luminance uniformity across the entire viewing window
Solution Approach 2:
The system pre-calculates and pre-adjusts the light distribution for different viewing positions and eye configurations. By making preliminary adjustments to the optical paths before light reaches the viewer, the system ensures uniform luminance while maintaining optimized viewing windows for both eyes
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 solution provides a hologram display apparatus with a wider viewing window and improved reliability by ensuring uniform light distribution to both eyes, maintaining high visibility even when the viewer is not centered, thus enhancing the overall hologram recognition experience.
Implementation Method 1
an optical path switching unit that refracts the light with the determined grade
Implementation Method 2
a dynamic prism system is implemented to detect the viewer's position and refract light accordingly, with an optical path switching unit using a liquid crystal unit to adjust the light path
Data Source
AI summary
Provided is a hologram display apparatus according to an exemplary embodiment of the present invention. The hologram display apparatus includes: a detector configured to detect a position of a viewer; and a spatial light modulation panel that modulates a light to display a hologram. Further, a grade is determined on the basis of the detected position of the viewer. An optical path switching unit refracts the light from the spatial light modulation panel with the determined grade. A laser source of the hologram display apparatus generates the light with a compensated output on the basis of the grade.