JPS60196733A - Optical arithmetic unit - Google Patents

Abstract

PURPOSE:To reduce the number of display arrays and light receiving arrays to obtain a highly practical optical arithmetic unit by processing electric input signals and optical image inputs in parallel. CONSTITUTION:Each picture element consists of plural photodetectors 1, an arithmetic circuit 2, and a display device 3, and the operating circuit 2 is provided with an input/output port 4. An electric input is written in a storage memory CSE of each picture element through an input data line 25, an input timing line 26, and an electric image input part 27 during the display data input period. The output of a photo transistor TR10 is amplified and is written in a memory CSO. Two information are calculated in an arithmetic circuit part (ALU) 11, and finally, the arithmetic result is outputted to a driver, and a liquid crystal panel 5 is driven by a thin film TR15. Thus, the electric logic circuit is arranged in each picture element to process picture element information in time series. This device has the advantage of possibility of program.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an optical arithmetic unit that divides image information into pixels and performs parallel processing.

[Prior art]

Image information has a large amount of information, and in order to process it at high speed, optical computing units that can perform parallel processing are being considered.

For example, the tse computer (Pr
oc Engineering KFiFi 65 No, 1 pp-, 129
~138), half adder using OdS and liquid crystal (Opt
, Eng, Re No., 5 pp, 515-517),
Basic logic circuit (Ap
pl, Phya, Lett, 57 pp, 3
9 B) etc. However, both are basic logic circuits and require a large number of devices and optical fiber bundles for functional calculations. Therefore, as an actual optical arithmetic unit, it occupies a large space and is expensive. In addition, the programs lack versatility, and none of them have been put to practical use.[Object of the Invention] The purpose of the present invention is to reduce the number of display arrays and light receiving arrays by processing electrical input signals and optical image input in parallel. The purpose of the present invention is to provide an optical arithmetic unit with high performance.

[Summary of the invention]

In the present invention, as shown in FIG. 1, each pixel is composed of a plurality of light receivers (1), a calculation electric circuit (2), and a display device (2), and the calculation electric circuit is provided with an electric input/output port (2).

"Each pixel is connected to other pixels and external circuits through electrical input/output ports.The function of the arithmetic electrical circuit is not only the conventional basic logic circuit, but also logical calculations until the final output is provided to the display. For this reason, the number of light receivers and displays can be kept to a minimum, eliminating the need for fiber bundles for optical connections, and also allowing clock signals and programs to be applied from outside.

Multiple receivers accept multiple image inputs simultaneously,
It also enables production by inputting images that change over time.

These light receivers and arithmetic electric circuits are integrated on a substrate on which a display array is installed. Therefore, the driving devices of various conventional active matrix display devices are
It has a form that combines a light receiver) and an intelligence (arithmetic electric circuit).

〔Example〕

Embodiment 1 Embodiment 1 shows an example of simple image calculation in which AND and OR of two image inputs are switched by an external electric manual. As shown in Figure 2, the display device ■ consists of a twisted nematic liquid crystal panel and two polarizing plates.
Output light (2) corresponding to the AND or OR logic is emitted. FIG. 6 shows a perspective view of a pixel. 3 is an electrode for driving the liquid crystal. Two photodetectors with different growth sensitivities, here phototransistors [phases], are installed corresponding to the pixels. Wavelength selectivity is obtained by a color filter provided on the upper glass. The arithmetic electric circuit section 0 is connected to a power supply line 0 and a control bus 0, and can switch between AN'D and OR using an external electric signal 0. FIG. 4 is a block diagram of the arithmetic electrical circuit used. control signal 0
By AND logic, ORi! The logic is switching. The logic circuit is made of TPT (thin film transistor) using a silicon thin film and is integrated in the logic circuit section of the pixel. At the same time, a silicon phototransistor [phase] is also formed using the same silicon thin film. @ is a driving transistor, [
phase] is liquid crystal.

In this example, we have shown that the basic logic of AND and OR can be realized, but by removing the color filter, we can create an exclusive OR of the outputs of multiple phototransistors heated by several pixels.
Contours can be drawn by using logic.

Furthermore, by changing the design of the logic circuit section, image calculations such as comparators, NOTs, averaging of input light, A, -D conversion, differentiation, etc. can be performed.

Example 2 Example 2 is an example of the present invention that performs wavelength conversion. Simply put, light is emitted or modulated by a display device on the same substrate that outputs light of different wavelengths according to the output of a photodetector sensitive to a specific wavelength. An example of such an infrared light-visible light conversion device will be described. A thin film KL (TFHL) [phase] was used for the display, and a photodetector was a n5b7 photodiode sensitive to infrared light. This output is amplified by the electric arithmetic circuit section @ and then applied to the TFBL driving transistor @. FIG. 5 is a perspective view of one pixel. A transparent electrode (1) and TIFKL (dielectric layer @Z n S: M n layer O, dielectric layer 0) are laminated on a transparent substrate O. Next, the Att pole [phase], which is a light-shielding electrode, and then the Od
An arithmetic circuit [phase], TFIT, and +drive circuit 0 are formed using the s thin film. Next, the photodiode chip @ is wire bonded. The infrared sensor can also be installed by other means suitable for mass production.

@ is the power line. FIG. 6 shows an example of the circuit.

In addition to drive transistor 0, holding capacitor NOθ [phase], bias AC path 0. Consists of an arithmetic circuit @ Also, using the transistor [phase] and storage capacitor [phase] in the drive circuit section, the displayed image data can be read out to an external circuit in the same way as a normal MOS memory. It is possible.

Embodiment 3 Embodiment 3 shows an example in which electrical input/output is used in addition to optical image input/output. As in Example 1, a liquid crystal panel ■ driven by a silicon thin film TF'l' [phase] is used as a display device.
A phototransistor [phase] formed of a silicon thin film is used as a photodetector, and a silicon thin film integrated circuit formed on the same substrate is used as an arithmetic circuit 0. FIG. 7 is a block diagram thereof. Electrical input is written to the storage memo 'j08m of each pixel through the input data line [phase] and the input timing line [phase] during the display data input period. O is an electrical image input section. Next, the reading calculation period for optical image input will be explained. [Phase] is the optical image input part of the pixel. The output of the phototransistor [phase] is amplified and written to the storage memory Oso. [Phase] is the control bus of the optical input section. Next, the two pieces of information are calculated in ALU (arithmetic circuit unit) 0. [Phase] is the ALU control bus command, which transmits the clock and four-gram pulses. Finally, the calculation result is output to the driver transistor @, and the liquid crystal ■ is driven. This completes one cycle. This timing is shown in FIG. Each unit is operating when indicated by diagonal lines or dots. The display displays the calculation result of one cycle before.

Since the display uses liquid crystal in this case, the display can be maintained for one cycle. Furthermore, if one cycle is made shorter than the human's 7 ritsu force - detection time of 50 m5 ec, calculation of moving images is also possible.

Further, it is also possible to provide a period within one cycle in which display information of each pixel, for example, voltage applied to the liquid crystal, etc., is output. This allows display data, that is, calculation results, to be electrically output to the outside. In FIG. 7, the transistor (2) constitutes a memory cell together with the liquid crystal (2), and outputs information through a word line [phase] and a sense line [phase]. This operation can be performed similarly to a dynamic MOS memory.

This embodiment has a wide range of applications, and can be applied to calculations between electrical image information and optical images, such as detecting coincidence or mismatch, touch input to display information, partial erasing, partial rewriting, etc. Also stores and outputs optical information processing results,
For example, it is also applied to transmitting Fourier-transformed data using holography.

Although this embodiment has been described as an array in which a large number of pixels are arranged on the same substrate, it can also be applied to an ultra-large display in which pixels of several meters square are arranged to form an image.

Embodiment 4 Embodiment 4 shows an example in which feedback is applied by an arithmetic circuit to constitute an optical flip-flop or an image storage device. A photodetector, an arithmetic circuit, and a display are formed in an array on the same silicon substrate. FIG. 9 shows a perspective view of one pixel.

The photodetector is a silicon planar photodiode [phase], the arithmetic circuit is an array flop circuit [phase] integrated on a silicon substrate, and the display is a GaP light emitting diode [phase] chip-bonded on the substrate. @ is the power line, @ is the arithmetic circuit control bus. The optical input O when this signal is inverted from ``1M'' to ``0'' is held. By exchanging the optical input and the control signal, the retention of the display signal (control signal) can be controlled by the optical input. In this case, it is necessary to add Os of the second embodiment for accumulating the display signal.

In addition, multiple photodetectors are installed in each pixel to detect different polarized light.
It is also possible to perform accumulation, inversion, etc. by using light of different wavelengths and only by inputting light.

〔Effect of the invention〕

As described above, according to the present invention, it is not only possible to construct a lightweight flat-plate optical arithmetic unit, but also has various image calculation functions (wavelength conversion, image storage, coincidence detection, outline drawing, etc.).
It is possible to obtain an optical arithmetic unit having differentiators, Fourier transforms, comparators, etc.). Furthermore, optical image input and electrical image input can be combined for calculation, making electrical input/output possible. The arithmetic function of electrical input/output and optical images is very effective in the fields of OT (computer tomography) and remote sensing, which synthesize planar images from two-dimensional image electrical signals.

Furthermore, the present invention can process pixel information in time series by disposing an electrical logic circuit in each pixel. It is a groundbreaking product that has not been seen before in that it has so-called programmable possibilities.

[Brief explanation of the drawing]

FIG. 1 shows the concept of the present invention, and shows a functional section for one pixel. FIG. 2 shows an example of image calculation. FIG. 6 is a perspective view of one pixel using liquid crystal and TPT. FIG. 4 shows an example of an arithmetic circuit. FIG. 5 shows one pixel in the case of a wavelength converter using TIPFiL. FIG. 156 is an example of the circuit used in FIG. FIG. 7 shows an example of a circuit of an optical arithmetic unit capable of optical image input and electrical input/output. FIG. 8 shows the operation timing of each unit. FIG. 9 is a perspective view of one pixel of an image storage device using LEDs. FIG. 10 is an example of the circuit used in FIG. 9. Applicant Suwa Seikosha Co., Ltd. Agent Patent Attorney Mogami - Fig. 1 Fig. 2 Fig. 4 Fig. 5 Fig. 6 Fig. 71j figure

Claims (1)

[Scope of Claims] (1) In an optical arithmetic unit that has a light receiving array, an arithmetic array, and a display array and performs optical image information processing in parallel, image information is calculated by an electric circuit arranged in each pixel. An optical computing unit featuring: (2) Claim 1, wherein the arithmetic electric circuit is equipped with an electrical image information input/output device.
Optical computing unit described in section. (8) The optical arithmetic unit according to any one of claims 1 to 2, wherein the light receiving array comprises a plurality of light receivers per unit pixel. (4) The optical arithmetic unit according to claim 1, wherein the light receiving array is comprised of a plurality of types of light receivers having center sensitivities at different wavelengths. (5) The optical arithmetic unit according to claim 1, wherein the light receiving array is comprised of a plurality of types of light receivers having center sensitivities to different polarized lights. (6) The optical arithmetic unit according to claim 1, wherein the display array is a device that performs display using the electro-optic effect of liquid crystal. (7) The optical arithmetic unit according to claim 1, wherein the display array is comprised of light emitting diodes. (8) The optical arithmetic unit according to claim 1, wherein the display array is an liL device. (9) The optical arithmetic unit according to claim 1, wherein the display play includes an optical filter that blocks input light. (2) The light-receiving array 1, the operation array, and the display. 2. The optical computing unit according to claim 1, wherein each pixel constituting the play is composed of a unit light receiver, a unit computing unit, and a unit display.