Image Display Device Phase Modulation Peak Brightness
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Solution Overview
Problem
Image display devices face challenges in maintaining peak brightness when displaying moving images in high dynamic range, as the phase modulation unit's rewriting process leads to unnecessary light distribution and reduction in peak brightness.
Innovation Solution
The image display device incorporates a control unit, phase modulation panel, and intensity modulation panel, where the light source unit applies illumination light to the phase modulation panel, which modulates phase and divides it for each pixel group, and the intensity modulation panel adjusts intensity, allowing for line-sequential rewriting and efficient light distribution to prevent peak brightness reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the phase modulation unit performs Fourier transform of image signal on the entire surface, then the hologram can be reproduced by diffraction of light, but light is distributed from the entire surface to the entire surface causing unnecessary light discard during frame switching
Solution Approach 1:
The phase modulation unit is divided into a plurality of phase modulation pixel groups, and the intensity modulation unit is divided into a plurality of intensity modulation pixel groups. The light from the light source unit is divided into first light and second light, with first light incident on the phase modulation unit and second light incident on the intensity modulation unit. This segmentation allows each region to be independently controlled during frame switching, preventing unnecessary light discard while maintaining hologram reproduction quality.
2Adaptability or versatility
If the phase modulation unit is rewritten line-sequentially from upper edge to lower edge, then the image signal can be updated, but light corresponding to previous frames is split and discarded reducing peak brightness
Solution Approach 1:
By dividing the phase modulation unit into multiple pixel groups and the intensity modulation unit into multiple pixel groups, the system can selectively control which regions are updated during frame switching. This allows the peak brightness to be maintained by ensuring that light corresponding to the current frame is not discarded, while still enabling line-sequential rewriting for frame updates.
Solution Approach 2:
The intensity modulation unit acts as an intermediary between the phase modulation unit and the projection lens. By dividing light into first light (from phase modulation) and second light (from intensity modulation), the system can use the intensity modulation unit to compensate for light loss during frame switching, thereby maintaining peak brightness while enabling frame updates.
3Illumination intensity
If the entire surface of the phase modulation unit is used for hologram reproduction, then high dynamic range can be achieved, but light distribution becomes inefficient during frame switching causing peak brightness reduction
Solution Approach 1:
The phase modulation unit is segmented into multiple pixel groups that can be independently controlled. During frame switching, only the necessary regions are updated while other regions maintain their light distribution patterns. This segmentation improves light utilization efficiency by preventing unnecessary light discard, while the entire surface can still be utilized for hologram reproduction to achieve high dynamic range.
Solution Approach 2:
The system dynamically adjusts the light distribution by dividing light into first light and second light, and by controlling different regions of the phase and intensity modulation units differently during frame switching. This dynamic control allows the system to maintain high dynamic range while improving light utilization efficiency during frame transitions.
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 configuration ensures consistent peak brightness and wider dynamic range by optimizing light distribution and usage, preventing unnecessary light discard during frame switching, thus enhancing the display of moving images.
Implementation Method 1
the phase modulation unit has a function of allocating light in accordance with an image signal and improving a peak brightness of the light by reproducing a hologram by diffraction of light
Implementation Method 2
the intensity modulation panel modulates an intensity of the second illumination light applied from the phase modulation panel
Data Source
AI summary
Provided is a device that displays a moving image with high dynamic range. A control unit controls drive of at least one of a light source unit, a phase modulation unit, or an intensity modulation unit in accordance with an image signal. The light source unit applies first illumination light to a phase modulation panel of the phase modulation unit, which modulates a phase of the first illumination light applied from the light source unit, divides second illumination light for each predetermined phase modulation pixel group of the phase modulation panel, and applies the second illumination light to the intensity modulation panel for each predetermined intensity modulation pixel group of the intensity modulation panel, and the intensity modulation panel modulates an intensity of the second illumination light applied from the phase modulation panel.