电子工程代写|三维成像代写Three-Dimensional Imaging代考|MDIA1017

电子工程代写|三维成像代写Three-Dimensional Imaging代考|Integral Imaging with Point Light Source Array

The earliest 3-D/2-D convertible method uses a point light source array and a polymer-dispersed liquid crystal (PDLC) $[15,17]$. The PDLC is a kind of active diffuser that can be both diffusive and transparent according to the voltage application. In the PDLC, the liquid crystal droplets are randomly arranged in the polymer. With no voltage applied, the directions of LCs in LC droplets do not have uniformity. The light through the PDLC is scattered by those droplets. If voltage is applied, the LCs in LC droplets are arranged into a uniform direction and the PDLC becomes transparent. The earliest 3-D/2-D convertible methods used a collimated light [15]. A 2-D lens array is used to form a point light source array in Fig. 4.7. If the PDLC plane, that is attached to the lens array, scatters light, then it destroys the collimated light and no point light source array is formed. This case can be used for the 2-D display mode. Therefore, electrical 3-D/2-D conversion is possible by controlling the PDLC.

In this section, we introduce a 2-D/3-D convertible system using a lightemitting diode (LED) array. LEDs are currently being used for backlight units of 2-D LCD systems. LEDs can also be used for 2-D/3-D convertible integral imaging systems with reduced thickness as compared with the previous method. The basic concept of the system is that each mode of either 2-D or 3-D uses different combinations of LED arrays [18]. Figure $4.8$ shows the concept of the proposed system. The backlight is constructed by two kinds of LEDs – one kind for the 3-D mode and the other for the 2-D mode. The diffuser is placed in front of each LED used for the 2-D mode. The backlight for the 3-D mode comes out from the apertures (not passing through the diffuser) in front of the LEDs used in the 3-D mode. An LCD is used to modulate the backlight in the form of a 2-D image or elemental images for a 3-D display. In the 3-D display mode, the LEDs for the 3 – $\mathrm{D}$ mode are emitting lights. The lights diverge through the apertures and go through the display panel. A lens array can also be inserted between the LEDs and LCD so that the number of point light sources becomes larger than the number of 3-D mode LEDs. For example, $2 N \times 2 N$ uniformly distributed point light sources can be generated using a lens array consisting of $N \times N$ elemental lenses. In the 2-D display mode, the LEDs for the 2-D mode are illuminating and the light goes through the diffusers which are placed in front of the LEDs. Then, the light is diffused and used as a backlight for the LCD that displays 2-D images.

电子工程代写|三维成像代写Three-Dimensional Imaging代考|Integral Imaging Using a Pinhole Array on a Polarizer

A proposed improvement over the above methods, especially for the thickness of a system, is a method using a pinhole array fabricated on a polarizer (PAP) [19]. In the PDLC method, the point light sources are generated through the lens array and high optical efficiency can be acquired. However, a gap is needed to form the point light source. This gap increases the thickness. The method explained here reverses the advantages and disadvantages of the PDLC method – it has a low optical efficiency, but thin system thickness. The key device of the method is the PAP. According to the polarization of the light, the PAP can become either a pinhole array for the 3-D mode or a transparent sheet for the 2-D mode. Using this property, a point light source array is generated from the pinholes in the 3-D mode; whereas, it vanishes in the 2-D mode. 3-D/2-D conversion is possible by changing the polarization state of the backlight unit. The structure of the PAP system is shown in

Fig. $4.9[19]$. As shown in the figure, the system is composed of an LCD panel, the PAP, a polarization switcher which is a single LCD cell, and a backlight unit. If the polarization switcher is adjusted so that the polarization of light incident on the PAP is orthogonal to the polarizer direction of the PAP panel, only the light that comes through the pinholes survives and forms a point light source array. On the other hand, if the polarization of light is set to the polarizer direction of the PAP panel, then the light transmits through the whole PAP plane and forms a planar light source for the 2-D display. Figure $4.10$ shows experimental results.

With the above principle, the PAP method has the following advantages and a disadvantage.

电子工程代写|三维成像代写Three-Dimensional Imaging代考|Integral Imaging Using a Pinhole Array on a Polarizer

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