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One-unit system for electroholography by use of a special-purpose computational chip with a high-resolution liquid-crystal display toward a three-dimensional television

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Abstract

We developed a one-unit system for electroholography, which consists of a special-purpose computational chip and a high-resolution, reflective mode, liquid-crystal display panel as a spatial light modulator. We implemented them on one board whose size is approximately 20 cm × 20 cm. The chip makes a computer-generated hologram whose size is 800 × 600 at nearly real time (~0.5 s) for an object consisting of 1000 points. The pixel pitch of the display panel is 12 μm, and the resolution is 800 × 600. It reconstructs a three-dimensional motion image whose size is approximately 3 cm × 3 cm × 3 cm. The system can be readily scaled up, since the units consisting of the chip and the display are easily set in parallel.

©2004 Optical Society of America

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Figures (6)

Fig. 1.
Fig. 1. Schematic drawing of our recurrence formulas algorithm.
Fig. 2.
Fig. 2. Optical setup including the CGH calculation system.
Fig. 3.
Fig. 3. Top view of the one-unit system board made by hand.
Fig. 4.
Fig. 4. (318 KB movie) Reconstructed image from the one-unit system board.
Fig. 5.
Fig. 5. Parallel system by special-purpose chips and display panels.
Fig. 6.
Fig. 6. Top view of the one-unit system board by PCB.

Equations (6)

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I ( x α , y α ) = j N A j cos [ 2 π λ ( x α x j ) 2 + ( y α + y j ) 2 + z j ] .
I ( x α , y α ) = j N A j cos [ 2 π λ ( z j + x α j 2 + y α j 2 2 z j ) ] .
I ( X α , Y α ) = j N A j cos [ 2 π ( p Z j λ + p 2 λ Z j ( X α j 2 + Y α j 2 ) ) ] .
I ( X α + k , Y α ) = j N A j cos ( 2 π Θ k ) .
Θ 0 = p Z j λ + p 2 λ Z j ( X α j 2 + Y α j 2 ) , Γ 0 = p 2 λ Z j ( 2 X α j + 1 ) , Δ = p λ Z j .
Θ k + 1 = Θ k + Γ k , Γ k + 1 = Γ k + Δ .
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