Pixel-Based Diaphragm for Dynamic Bokeh and HDR Exposure
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Solution Overview
Problem
Existing optical systems lack flexibility in controlling the size, shape, and transmittance of the diaphragm, limiting their ability to achieve dynamic bokeh effects and optimal exposure conditions for high-dynamic range imaging.
Innovation Solution
Integration of a pixel-based liquid crystal panel as a tunable diaphragm, where each pixel's transmittance is controlled by thin film transistors, allowing for customizable light patterns and improved bokeh features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional fixed diaphragm is used in the optical system, then the structure is simple and easy to manufacture, but the flexibility in controlling the size, shape, and transmittance of the diaphragm is limited
Solution Approach 1:
The diaphragm is segmented into multiple independently controllable pixels, each with its own transmittance control capability. This allows the diaphragm to dynamically adjust its effective aperture size, shape, and transmittance characteristics by selectively activating or deactivating individual pixels or groups of pixels, thereby achieving high flexibility without requiring multiple fixed diaphragms.
Solution Approach 2:
The diaphragm transitions from a static fixed aperture to a dynamic programmable aperture. The pixelated structure with independent control over each pixel enables real-time adjustment of the diaphragm's size, shape, and transmittance characteristics, allowing the optical system to adapt to different imaging requirements dynamically.
2Adaptability or versatility
If a pixel-based liquid crystal panel is integrated as a tunable diaphragm, then dynamic bokeh effects and optimal exposure conditions are achieved, but the device complexity increases
Solution Approach 1:
The pixel-based liquid crystal panel serves multiple functions simultaneously: it acts as both the diaphragm aperture control element and the bokeh shaping element. By programming different patterns of pixel transmittance, the same device can create various bokeh effects (circular, hexagonal, custom shapes) and control exposure, eliminating the need for separate mechanical diaphragm mechanisms.
Solution Approach 2:
The traditional mechanical diaphragm system with moving blades is replaced by an electrically controlled liquid crystal pixel array. This substitution eliminates complex mechanical linkages, moving parts, and precise mechanical alignment requirements, while achieving superior control flexibility through electrical programming of pixel states.
3Manufacturing precision
If the pixel-based diaphragm is placed at the aperture stop, then optimal control over light transmission is achieved, but the alignment precision requirements increase
Solution Approach 1:
The system compensates for alignment variations by dynamically adjusting the transmittance parameters of individual pixels. If slight misalignment occurs, the control algorithm can adjust the effective aperture position and size by selectively modulating pixel transmittance, thereby maintaining optimal light transmission control despite manufacturing tolerances.
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 pixel-based diaphragm provides enhanced control over light transmission, enabling dynamic bokeh effects and optimal exposure conditions for high-dynamic range imaging.
Implementation Method 1
Liquid crystals are widely used for optical devices due to the large electro-optic modulation resulting from the high optical anisotropy
Implementation Method 2
liquid crystal devices play an important role in many optical systems by means of the change in the phase or the polarization state of light
Data Source
AI summary
An optical system includes a light-receiving plane, a lens group, a pixel-based diaphragm, and a driving unit. The lens group is configured to direct an incident light to the light receiving plane. The pixel-based diaphragm is at an aperture stop of the lens group. The pixel-based diaphragm includes a first substrate coated with pixelated electrodes; a second substrate coated with an electrode; and an active medium layer between the first substrate and the second substrate. The driving unit is electrically coupled with the pixel-based diaphragm and configured to control the pixel-based diaphragm to have a first light transmitting pattern at a first time duration and a second light transmitting pattern at a second time duration, wherein the first light transmitting pattern is different from the second light transmitting pattern.