JPH06261312A - Portable video telephone system - Google Patents

Abstract

PURPOSE:To miniaturize and lighten a portable video telephone system by incorporating a modulation/demodulation circuit, a picture processing circuit and a sound processing circuit in a casing constituted by integrally providing a cfamera part and a liquid crystal display part and connecting the caseing to an existing telephone set so as to use it. CONSTITUTION:The camera part 2 is a small CCD camera which is freely attachably/detachably provided in the same plane direction as the display surface of the liquid crystal display part. It is connected to a device main body 1a through a video cable 2b. Thus, a picture can be fetched by the taste of an oeprator in spite of the arranged position of the device main body 1a. The liquid crystal display part is the liquid crystal display device of an active matrix type and it is provided with a high resolution color liquid crystal display panel where respective picture elements corresponding to three primary colors are arranged in a delta form. The device 1 is installed between a moduler jack-type socket connected to an analog public line and the telephone set. A key switch 6 consists of a video on/off switch 7, a video change-over switch 8 and a picture fetch switch 9, and the operator selects various processings.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable videophone device, and more particularly to a compact and lightweight portable videophone device for transmitting / receiving voice data and transmitting / receiving image data.

[0002]

2. Description of the Related Art With the recent development of a highly information-oriented society, there is an increasing demand for communication media that transmit large amounts of various information at high speed.

In order to meet such demand, in 1988, TTC (Telecommunication Technology Committee:
JJ as a standard communication method of (Telephone and Telephone Technical Committee)
-40.10 "Analog Telephone Band Still Image Video Communication System"
Since then, it has become possible to exchange black and white image data with each other via a communication line.After that, the standard communication system of TTC was revised in 1989, and not only black and white image data but also It is also possible to send and receive color image data, and various videophone devices conforming to these TTC standard communication systems have been developed.

Depending on the type of communication network to be connected and the type of image and voice transmission function, the video telephone device is connected to, for example, an analog public line to transmit a monochrome still image or a color still image, or a color moving image. There are things that transmit images, etc., and the merit that it is possible to show and transmit information that is difficult to convey to the other party only by explanation with voice,
It is expected to be popular because it has the advantage of being able to make a call while looking at the expression of the other party.

Conventionally, a still picture video-phone device connected to an analog public line to transmit a black and white still image has adopted a method of transmitting image data as it is without compressing it, for example, one screen is 100 × 160. 100 x 1 when handling black and white image data with 64 gradations (6 bits) in pixels
60 x 6 = 96000 bits (about 11.7 kilobytes)
Data was transmitted at a transmission rate of about 8740 bps (Bit Per Second: bits / second), it took about 11 seconds to transmit one screen of image data, but the image data Since the amount is large, it is not practical to process it as it is because of the memory capacity and communication speed.

Therefore, the image data and audio data to be transmitted as shown in FIG.
A color moving picture videophone device 201 has been devised which enables transmission and reception of moving images of about 2 to 10 frames / second by utilizing the analog telephone band by compressing and transmitting to about 00. In FIG. 12, reference numeral 202 denotes a camera unit, 20
Reference numeral 3 is a CRT (Cathode Ray Tube) which is an image display unit, and 2
Reference numeral 04 is a telephone, and 205 is a key input unit.

The videophone device 201 connected to such an analog communication network has a communication function of transmitting and receiving by multiplexing image information and audio information, and corresponds to the connected communication network. Regarding the communication procedure and the encoding method of the image information and the audio information which are transmitted / received in addition to the communication signal based on the communication procedure, each type of communication network is recommended by CCITT (International Telegraph and Telephone Consultative Committee) etc. Stipulated in.

[0008]

Generally, in compression transmission of image data, since an extremely large amount of data is transmitted, even if some transmission delay occurs, the influence on the progress of the call is not so great. Long encoding (eg CC
ITT Recommendation H. H.261 based variable length coding system, etc.) is generally performed. On the other hand, in compression transmission of voice data, the average generated bit length can be compressed by digitizing the voice data. Applying entropy compression whose length is not guaranteed (for example, Huffman coding) to a voice signal causes a large transmission delay in the voice signal when the voice signal is generated to have a long bit length by the entropy compression. Since it has a great influence on the progress of a call, it is transmitted after being encoded with a fixed bit length.

However, in the videophone device which transmits the image data as it is without being compressed, the transmission of a huge amount of image data is prioritized at the time of data transmission. There is a problem that the data transmission is stopped and the voice is interrupted during the transmission / reception of the image, which hinders the progress of the call.

On the other hand, in a videophone device that transmits image data and audio data after compressing them to, for example, about 1/20 to 1/100, the data compression rate is increased and the transmitted data is By multiplexing and transmitting the image data and the audio data at fixed time intervals, it is possible to transmit the image data without interruption of the audio. In this case, the image data and the audio data are included in the transmission data. , The transmission time of image data is shortened,
The amount of image data to be transmitted within a fixed time will be limited.

This is, for example, an ISDN (Integrated S
ervices Digital Network: Comprehensive service digital communication network), when using a large capacity line capable of 64 kbps data transmission
The maximum data transmission rate is 14 as with analog public lines.
When a general line of about 400 bps is used, if the amount of image data to be transmitted is limited, the image will be in a frame-by-frame state and image blurring will occur, which deteriorates the quality of the image to be transmitted. In particular, in the case of displaying a moving image, there is a problem that the image quality is significantly deteriorated.

Further, as shown in FIG. 12, a videophone device 201 for compressing and transmitting image data and audio data.
In this case, the camera unit 202 which is an image input unit and the CRT2 which is an image display unit for transmitting the compressed data.
03 and the telephone 204 which is the voice input / output unit are integrally configured, it is difficult to reduce the size and weight of the device, and it is difficult to obtain a portable device, and the existing telephone cannot be used. There was a problem.

That is, the conventional videophone device is made on the premise that it is of a stationary type, and once installed, it cannot be moved to another place for use.

By the way, recently, the image quality of the liquid crystal display device has been improved, and in particular, the active matrix type liquid crystal display device using a TFT (Thin Film Transistor) has been attracting attention as a display device replacing the CRT. By adopting this active matrix type liquid crystal display device, it is possible to reduce power consumption and to reduce the size and weight of the device.

The present invention employs a liquid crystal display device to reduce the size and size.
It is an object of the present invention to provide a portable videophone device that is lightweight and can be used while being carried.

[0016]

The means of the present invention are as follows.

According to the present invention, a camera unit for taking in a subject image as image data and a liquid crystal display unit for displaying predetermined image data are integrally provided in a housing connected to a predetermined communication line. A first input / output terminal for inputting / outputting image data and audio data and a second input / output terminal for connecting / disconnecting audio data by connecting to a telephone are provided, and image data and audio data are simultaneously transmitted / received through the communication line. In the portable videophone device, the modulation / modulation for modulating data output through the first input / output terminal and demodulating data input through the first input / output terminal in the housing is performed. A demodulation circuit and image data captured from the camera unit are encoded and compressed, and compressed compressed image data is output from the modulation / demodulation circuit to the communication line,
An image processing circuit that decodes and expands the compressed image data demodulated by the modulation / demodulation circuit, and outputs the expanded decompressed image data to the liquid crystal display unit, and is loaded from the telephone through the second input / output terminal. The audio data is encoded and compressed, and the compressed compressed audio data is output from the modulation / demodulation circuit via the communication line, and
And a voice processing circuit which decodes the compressed voice data demodulated by the demodulation circuit and decompresses the decompressed voice data, and outputs the decompressed decompressed voice data to the telephone through the second input / output terminal.

In this case, it is effective that the liquid crystal display section has a backlight device composed of a flat fluorescent tube.

Further, as described in claim 3, it is preferable that the housing has a battery portion that is detachably provided.

[0020]

The operation of the means of the present invention is as follows.

According to the first aspect of the present invention, a modulation / demodulation circuit, an image processing circuit, and an audio processing circuit are built in a housing constituted by integrally providing a camera section and a liquid crystal display section, By connecting this to an existing telephone and using it, the size and weight can be reduced.

In this case, as in the invention described in claim 2,
By using the flat fluorescent tube as the backlight of the liquid crystal display unit, the liquid crystal display unit can be made thinner, and the overall size and weight of the liquid crystal display unit can be further reduced, thus improving portability.

Further, according to the third aspect of the present invention, since the housing has the battery portion that is detachably provided, the portable use becomes easy.

[0024]

EXAMPLES Examples will be described below with reference to FIGS.

1 to 11 are views showing an embodiment of a portable videophone device according to the present invention.

First, the structure will be described. FIG. 1 is an external view showing a portable videophone device of the present invention, and FIG. 2 is a view showing a state in which the camera section of FIG. 1 is removed. The case where an analog telephone general subscriber line is used as the predetermined communication line will be described below.

In FIG. 1, a portable videophone device 1
Is roughly composed of a device body 1a and a power supply unit 1b. The device body 1a has a length of 65 mm, a width of 60 mm, and a thickness of 2 mm.
The size is 4 mm, the camera unit 2 and the liquid crystal display unit 3 are integrally provided, and the power switch 4, the power indicator 5, and the key switch 6 are provided on the surface of the apparatus main body 1a. The key switch 6 is composed of a video on / off switch 7, a video switching switch 8, an image capturing switch 9, and the like.

The power supply unit 1b is attached to the lower portion of the apparatus main body 1a to supply a predetermined power supply current to the apparatus main body 1a, and specifically, it is a dedicated nicad (Ni-C).
d) It is composed of a battery pack containing a storage battery. In addition, in the present embodiment, as the power supply unit 1b attached to the lower portion of the apparatus main body 1a, a battery pack having a dedicated NiCd storage battery is described as an example. A dry battery pack containing five dry batteries, an AC adapter using an AC (alternating current) power supply, a car adapter using a DC (direct current) battery from a cigarette lighter portion of an automobile, or the like may be used.

As shown in FIG. 2, the camera unit 2 is a small CCD (Charge Coupled Device) camera which is detachably provided in the same plane direction as the display surface of the liquid crystal display unit 3, and is connected via a video cable 2a. It is connected to the apparatus main body 1a.

The liquid crystal display unit 3 is a TFT type active matrix type liquid crystal display device having a screen size of 1.4 inches, and has three primary colors of R (Red) and G (Green).
n), and a high resolution color liquid crystal display panel of 220 × 279 = 61380 pixels in which pixels corresponding to B (Blue) are arranged in a delta shape.

FIG. 3 is a diagram for explaining the connection relationship of the portable videophone device 1 of FIG.

In FIG. 3, the portable videophone device 1 of the present embodiment is installed between a telephone jack 102 and a modular jack type outlet 101 connected to an analog public line, and connected to the analog public line on the rear surface thereof. LINE side input / output terminal 1L for connecting to the telephone 102 and TEL side input / output terminal 1T for connecting to the telephone 102.

A modular jack type outlet 101 and a LINE side input / output terminal 1 are connected by a modular cable 104 having modular plugs 103 at both ends.
L is connected to each, and TEL side input / output terminal 1T
And the telephone 102 are connected to each other.

FIG. 4 is a block diagram showing a schematic configuration of the portable videophone device 1 shown in FIG. In FIG. 4, a portable videophone device 1 includes a camera unit 2, a liquid crystal display unit 3, a key switch 6, a control circuit 11, and an image processing circuit 1.
2, the audio processing circuit 13 and the modulation / demodulation circuit 14, and the key switch 6, the control circuit 11, the image processing circuit 12, the audio processing circuit 13, and the modulation / demodulation circuit 14 are respectively connected to the bus 15. There is.

As shown in FIG. 1, the key switch 6 is composed of a video on / off switch 7, a video changeover switch 8 and an image capture switch 9 for selecting various processes in the portable videophone device 1. This is a switch for the operator to instruct. The video on / off switch 7 is a toggle switch for instructing the liquid crystal display unit 3 whether to display the LCD screen, and the video switch 8
Is a toggle switch for switching and displaying a transmission screen or a reception screen as an image to be displayed on the liquid crystal display unit 3, and the image capture switch 9 is a predetermined switch for displaying the image displayed on the liquid crystal display unit 3 as image data. Is a switch for instructing to store in the memory.

The control circuit 11 includes a CPU (Central Process).
sing unit) 16, RAM (Random Access Memory) 1
7 and ROM (Read Only Memory) 18.

The bus 15 includes the key switch 6 and the control circuit 1.
1. A common signal path for connecting the image processing circuit 12, the audio processing circuit 13, and the modulation / demodulation circuit 14, each of which includes an address bus for instructing an address and a data bus for transferring data. ing.

The CPU 16 outputs various control signals for controlling each circuit in the portable videophone device 1 to each circuit via the bus 15 and executes a communication control program according to the type of communication line to be connected. Is something that
The CPU 16 receives image data and voice data multiplexed and transmitted from the other party's videophone device (portable videophone device), demodulated by the modulation / demodulation circuit 14, and input, and then the demodulated image. Data and audio data are separated, compressed image data is output to the image compression / expansion circuit 19 via the bus 15, and compressed audio data is output to the audio compression / expansion circuit 27 via the bus 15. . Further, the CPU 16 multiplexes the compressed image data input from the image compression / expansion circuit 19 via the bus 15 and the compressed audio data input from the audio compression / expansion circuit 27 via the bus 15 to obtain image data and The audio data is output to the modulation / demodulation circuit 14 via the bus 15.

The RAM 17 is a semiconductor memory that stores program data used in the program processing executed by the CPU 16, compressed image data, audio data, and the like.

The ROM 18 is a semiconductor memory that stores programs and data used in the portable videophone device 1.

The image processing circuit 12 includes an image compression / expansion circuit 19, a buffer memory 20, an ADC (Analog to Digita).
l Converter: A / D converter 21, video memory (VRAM) 22, 23, DAC (Digital to Analog)
Converter: D / A converter) 24. Reference numeral 25 is an image input terminal.

The image compression / expansion circuit 19 uses, for example, JPEG (Joint Photographic) according to a predetermined encoding method of the image data stored in the video memory 22, that is, the type of image to be handled (still image in this case). (Coding)
Experts Group) performs compression processing (encoding) by DCT (Discrete Cosine Transform), quantization, and Huffman encoding for each 8 × 8 pixel block, and is also received via a communication line. , Performs expansion (decoding) processing of the reception compressed image data demodulated by the modulation / demodulation circuit 14, outputs the expanded image data to the video memory 23, and stores it. In this case, the communication line Through 110 × 16
Image data sent as a color video signal of 0,096 pixels at the maximum of 4096 colors (12 bits) is a luminance signal corresponding to 220 × 279 pixels (hereinafter referred to as Y signal) and a color signal corresponding to 4096 colors (hereinafter referred to as C signal). It has a function of processing as a YC signal consisting of
12-bit data of 60 pixels is converted into 12-bit digital image data of 220 × 279 pixels. The data compression rate in the image compression processing is about 7/100 (about 68/100) from the relationship with the image quality after decompression.
0).

The buffer memory 20 temporarily stores the compressed image data compressed by the image compression / expansion circuit 19, and the image data stored in the buffer memory 20 in the compressed state is stored in the CPU 16 by the CPU 16. Are sequentially read out based on the control command.

The ADC 21 converts an image signal (analog signal) input from the camera section 2 into a signal (digital signal) that can be processed in the image processing circuit 12 and outputs the signal to the video memory 22.

The video memories 22 and 23 are VRAM (Vi
deo RAM) and the video memory 22 is an AD
Image data (digital data) output from C21
Image memory, video memory 23 for storing
Is a semiconductor image memory for storing image data (digital data) compressed / decompressed by the image compression / decompression circuit 19.

The DAC 24 converts the image signal (digital signal) of the image data stored in the video memory 23 into a signal (analog signal) which can be displayed by the liquid crystal display unit 3 and outputs it. In this embodiment, since the analog data driver is used as the data driver of the LCD 35 described later, the DAC (D / A converter) is used.
However, if a digital data driver is used as the data driver, this DAC24
Is unnecessary.

The audio processing circuit 13 comprises an ADC 26, an audio compression / expansion circuit 27, a buffer memory 28, and a DAC 29.

The ADC 26 converts a voice signal (analog signal) input from the telephone set 102 through the NCU 31 of the modulation / demodulation circuit 14 into a signal (digital signal) that can be processed in the voice processing circuit 13 and compresses the voice.・ Expansion circuit 2
7 is output.

The audio compression / expansion circuit 27 converts the digital audio data input from the ADC 26 into, for example, CEL.
By P (Code-Excited Linear Predivtion) algorithm, by a predetermined encoding method by means for analyzing input data for a fixed time, means for synthesizing waveforms by analyzed parameters, means for calculating error between input waveform and synthesized waveform, etc. A compression (encoding) process is performed on the input data from the bus 15, and the compressed audio data is re-input to the bus 15.
To output to the TEL side input / output terminal 1T via the DAC 29, by performing expansion (decoding) processing of the reception compressed audio data demodulated by the modulation / demodulation circuit 14. Is. The data compression rate in the audio compression process is about 5/100 (about 50/1000) because of the relationship with the audio quality after decompression.

The buffer memory 28 temporarily stores the compressed voice data compressed by the voice compression / expansion circuit 27, and the voice data stored in the buffer memory 28 in a compressed state is stored in the CPU 16 by the CPU 16. Are sequentially read out based on the control command.

The DAC 29 converts the audio data, which is a digital signal output from the audio compression / expansion circuit 27, into an analog signal and outputs it to the NCU 31 of the modulation / demodulation circuit 14.

The modulation / demodulation circuit 14 is a modem (MODEM, MO
dulation and DEModulation) 30, NCU (Network
Control Unit) 31. 1
L and 1T are input / output terminals for the above-mentioned communication line (in this case, a general subscriber line).

The modem 30 and the NCU 31 send serial digital signals output from a computer or terminal device,
A function as a "modulator" that converts and transmits to a transmission signal (analog signal) that can be transmitted on a communication line,
Conversely, it has a function as a "demodulator" that converts a transmission signal (analog signal) sent via a communication line back into a digital signal that can be decoded by a computer or a terminal device. The NCU 31 makes it possible to use a general subscriber line as a communication line to be used.

Further, the modems 30 and N in this embodiment are
The CU 31 is capable of signal transmission at 14400 bps, which is the maximum data transmission rate that can be used in an analog public line, and by incorporating a video code and an audio code into one frame which is a processing unit, image data and audio data can be obtained. Simultaneous transmission in both directions, and image data for one screen is 3
It is transmitted as an intermittent image at a rate of 1 frame per second.

FIG. 5 is a diagram showing the structure of one frame of the multiplexed code.

The multiplex code which constitutes one frame is about 256 bytes (about 204 bytes) including a video header and a video code.
It is composed of video data of 8 bits) and audio data of about 256 bytes (about 2048 bits) including an audio header and an audio code. The video code and the audio code include an error correction code, and the video code Since the video header and the audio header are respectively added before and the audio code, the total transmission data amount of the image data included in the actual video code and the audio data included in the audio code is 9600b.
ps, which uses 4800 bps for image data and 4800 bps for audio data.

Specifically, the data length of one frame is about 512 bytes (about 4098 bits) for video data and about 256 bytes for audio data.
At a transmission rate of 14400 bps, the data transmission time for one frame is approximately 280 ms (approximately 14
0 ms, about 140 ms for voice data).

That is, about 3.57 frames of data are transmitted per second, and the video data transmitted per second is about 7300 bits (256 × 8 × 3.57 = 7).
311). Therefore, in the present embodiment, about 2500 bit data obtained by subtracting the actual image data (4800 bps) from the about 7300 bit data transmitted per second, information about the screen size, the command regarding the image data transmission, and the error correction code are added. Etc. are included.

The image data handled in this embodiment is color image data of 4096 colors (12 bits) with 110 × 160 pixels on one screen, and the image data amount for one screen is 11
It becomes 0 × 279 × 12 = 211200 bits (about 25.8 kilobytes). This is about 68 / by image compression processing.
The data is collectively compressed into 1000 to obtain 14400-bit image data, and this 14400-bit image is 4
It transmits 800 bits at a time, that is, 3 seconds (= 1440
(0/4800) transmits an intermittent still image at a rate of 1 frame.

Therefore, the data actually transmitted in one second is obtained by dividing 211200 bits by 3 7
This is 0400-bit (about 8.6 kilobytes) image data, and this 70400-bit image data is about 68/1.
The video code is compressed to 000 to include 4800-bit image data.

In this case, as the image data to be transmitted, not only the image data for one screen is collectively compressed and the compressed image data is transmitted, but also the original image data is preliminarily based on the transmission time. It may be divided and the compression processing may be performed on the divided image data units.

On the other hand, the voice data is 12 bits / 8 kHz.
Treated as digital data sampled by z, this 12 × 8000 = 96000 bit voice data is
It is compressed to about 50/1000 to obtain a voice code including 4800-bit voice data.

The camera section 2 is composed of a lens 32 and a CCD 33.

The lens 32 is an optical lens made of glass or plastic provided in the main body of the portable videophone 1, and the CCD 33 generates an electric signal based on the intensity of the light imaged by the lens 32. The electric signal (analog signal) is output to the image processing circuit 12.

The liquid crystal display unit 3 is a DD (Display Driver).
34, and an LCD (Liquid Crystal Display) 35. Reference numeral 36 is a video input terminal and 37 is a video output terminal.

The DD 34 drives the LCD 35 in order to display an image on the LCD 35 based on the video signal input from the image processing circuit 12 or the video signal input from the video input terminal 36. Is
The input video signal is converted into a predetermined bit analog video signal (analog RGB signal) with 220 × 279 pixels,
It is output to the LCD 35.

The LCD 35 is a liquid crystal panel 35b described later.
The LCD 35 in this embodiment uses a small flat fluorescent tube 38, which will be described later, as its backlight (backside illumination).

In general, a liquid crystal display device is extremely thin as compared with an image display means such as a CRT, and can be easily reduced in size and weight, and an active matrix type LCD.
Compared with a simple matrix type LCD, a finer control of halftones is possible, a high contrast ratio can be secured, and the response speed is fast. Therefore, high image quality and multi-gradation color display are required. It is an effective device in the field, and particularly, an active matrix type LCD using a TFT which is a three-terminal element can obtain a high image quality comparable to that of a CRT.

In the present embodiment, in order to further utilize the excellent advantage of this liquid crystal display device, as described below,
We are also working to reduce the size of the backlight.

FIG. 6 is an exploded perspective view of the LCD 35.

In FIG. 6, the LCD 35 comprises a front shield case 35a, a liquid crystal display unit 35b, and a rear shield case 35c.

As shown in FIG. 6, the front shield case 35a has a screen display opening 35a1 formed therein, and an insulating tape 35a is formed on the back surface of the front shield case 35a.
2, 35a3 are adhered.

The liquid crystal display unit 35b is composed of a scan driver circuit 35b1, a data driver circuit 35b2 and a liquid crystal panel 35b3, and has a TAB (Tape Automated).
Bonding). Note that 35b4
Is a flexible substrate on which signal lines for outputting necessary signals to the scan driver circuit 35b1 and the data driver circuit 35b2 are wired.

The scan driver circuit 35b1 drives a scan bus (not shown) in the liquid crystal panel 35b3, controls on / off of TFTs for one line in the scanning direction, and controls the voltage of the data bus (not shown). The voltage is applied to the liquid crystal cell for a required period at a predetermined timing.

The data driver circuit 35b2 drives the data bus of the liquid crystal panel 35b3 based on the input of image data.

The display unit 35b3 is a TFT type liquid crystal display panel which is one of the active matrix systems, and is, for example, 22 output from the image compression / expansion circuit 19 and D / A converted by the DAC 24 via the video memory 23.
An analog video signal of 0x279 pixels and a predetermined number of bits is D
D34 outputs it as an analog RGB signal of 220 × 279 pixels with a predetermined number of bits, and displays an image on the display surface of the LCD 35 of 220 × 279 pixels.

As shown in FIG. 6, the back shield case 35c is formed with a backlight opening 35c1 and is fixed to the liquid crystal display unit 35b by double-sided tapes 35c2, 35c3, 35c4.

FIG. 7 is an exploded perspective view of the flat fluorescent tube 38.

The flat fluorescent tube 38, as shown in FIG.
Argon (A) is contained in a container composed of the front glass panel 38a, the rear glass panel 38b, and the frame glass 38c.
r) A gas and mercury (Hg) are enclosed, and a pair of left and right discharge electrodes having a hollow cathode structure having a U-shaped or V-shaped cross section (not shown) are arranged to face each other, and the inner surfaces of the front glass panel 38a and the rear glass panel 38b are disposed. The phosphor is applied by screen printing. Then, the lead pieces 38d extending downward corresponding to the left and right discharge electrodes,
38e. Note that 38f is an exhaust pipe and 38g is a fluorescent screen.

The flat fluorescent tube 38 is the same as the LCD 35.
It is to be laminated on the back surface of the
Light is uniformly applied to the backlight opening 35c1 from the entire surface of 8 g.

A transparent thin resin sheet 39 is attached to the front glass panel 38a with double-sided tapes 40 and 41 with a slight gap kept between the resin sheet 39 and the fluorescent surface 38g. The resin sheet 39 is formed by blending polyethylene terephthalate (PET) with an ultraviolet blocking agent, and is formed of a material having excellent heat resistance and an ultraviolet blocking function. In this case,
The ultraviolet blocking agent may be applied instead of being compounded.

A shield case 42 is provided on the back surface of the flat fluorescent tube 38.
Is to block the electromagnetic waves generated from the flat fluorescent tube 38 and prevent adverse effects on peripheral circuits. 4
3 is a spacer, 44 is a substrate, 45 is a lead wire, and 46 is a connector.

Then, the shield case 42 and the rear glass panel 38b are fixed with double-sided tapes 47 and 48,
As shown in FIG. 7, the flat fluorescent tube 38 to which the insulating tape 49 is attached is attached.

Further, below the shield case 42, a substrate 44 is arranged via a spacer 43, and lead pieces 38d, 38e and a lead wire 45 are soldered to the substrate 44, and the lead wire 45 is continued. And this lead wire 4
5 is connected to the connector 46.

That is, the spacer 43 is sandwiched between the shield case 42 and the substrate 44 and serves as a receiver when the substrate 44 is adhered and attached by the double-sided tape 50, and when the flat fluorescent tube 38 emits light. Light leakage is prevented, and an absolute distance between the shield case 42 and the substrate 44 with respect to high voltage is secured.

As described above, the liquid crystal display unit 35
The configuration is such that the flat fluorescent tube 38 is arranged in a state of being extremely close to the back side position of b. That is, the shield case 42 of the flat fluorescent tube 38 is formed in close contact with the rear surface position of the rear shield case 35c of the liquid crystal display unit 35b.

Here, since a high voltage is required to cause the flat fluorescent tube 38 to emit light, the flat fluorescent tube 3 is required.
8 lead pieces 38d, 38e and the substrate 4 connecting them
Above 4 is the high voltage range. Then, when the lead pieces 38d and 38e of the flat fluorescent tube 38 and the substrate 44 approach the rear shield case 35c of the liquid crystal display unit 35b, discharge is generated due to the high potential difference, a current flows, and the inside of the liquid crystal display unit 35b is destroyed. there is a possibility. Therefore, the fluorescent surface 38g and the lead piece 38 are provided on the front surface of the flat fluorescent tube 38.
Since the resin sheet 39 covering the d and 38e is provided, the lead pieces 38d and 38e come into contact with the hand, and the lead pieces 38d and 3e.
8e and the back shield case 35c between the substrate 44 and the liquid crystal display unit 35b can be insulated so as not to cause air discharge (leakage).

Further, since ultraviolet rays are generated from the flat fluorescent tube 38, the liquid crystal is deteriorated by the ultraviolet rays when it is used as a back light as it is, but since the resin sheet 39 contains an ultraviolet ray blocking agent, the liquid crystal is protected. can do.

In addition, the flat fluorescent tube 38 uses a resin sheet 39 having excellent heat resistance because the electric characteristics of the flat fluorescent tube 38 increase the stability of light emission as the fluorescent tube surface has a more uniform temperature distribution. A small space is set between the resin sheet 39 and the fluorescent surface 38g by affixing with a slight gap therebetween, and a small space is set between the resin sheet 39 and the fluorescent surface 38g. It has a heat retention function to warm the layers.

Furthermore, when the fluorescent surface 38g of the flat fluorescent tube 38 is scratched at the time of assembly at the factory, diffuse reflection occurs due to the scratch, and the scratch appears as a shadow on the liquid crystal screen. 39 prevents scratches in the process.

Next, the operation of this embodiment will be described.

First, the operation of the control circuit 11 shown in FIG. 4 will be described with reference to the flowcharts of FIGS. 8 and 9. The program corresponding to the processing operation of the CPU 16 in the control circuit 11 is the ROM in the control circuit 11 as well.
18 are stored.

The portable videophone device 1 according to this embodiment has a LINE side input / output terminal 1L and a TEL side input / output terminal 1T when the portable videophone device 1 is in a power-off state. The voice signal of the telephone set 102 is directly output to the analog public line from the TEL side input / output terminal 1T through the LINE side input / output terminal 1L, while the voice signal of the telephone 102 is input from the analog public line. Is the LINE side input / output terminal 1
It is directly input from the L to the telephone set 102 via the TEL-side input / output terminal 1T.

When the portable videophone device 1 is in the power-on state, the voice signal of the telephone 102 is taken into the portable videophone device 1 from the TEL-side input / output terminal 1T, and once converted by the ADC 26 into A / D. After that, it is compressed by a predetermined compression processing by the audio compression / expansion circuit 27 and output to the bus 15. Then, the audio signal output to the bus 15 is combined with the image signal by the CPU 16, modulated by the modem 30 and the NCU 31, and LIN.
It is output to the E side input / output terminal 1L.

On the other hand, the input signal input from the analog public line through the LINE side input / output terminal 1L is the modem 3
After being demodulated by 0 and NCU 31, it is A / D converted by a DSP (Digital Signal Processor) in the modem 30 and output to the bus 15. Then, the image signal and the audio signal output to the bus 15 are separated into the image signal and the audio signal by the CPU 16, the audio signal is expanded by the audio compression / expansion circuit 27, and further, the D29 is generated by the DAC 29.
/ A converted and output to the TEL side input / output terminal 1T.

FIG. 8 is a flow chart for explaining the processing operation of the CPU 16.

First, after turning on the power of the portable videophone device 1, initialization such as initialization of the control circuit 11 and clearing of each memory are performed (step S1), and whether there is an input from the key switch 6 or not. A key scan is performed to check (step S2), and when there is a key input, necessary processing described below is executed according to the key operation.

Next, the reception flag is once turned off (= "0").
The line voltage level of the NCU 31 is monitored (step S3), and in this state, the ringer tone is detected and the presence or absence of a call from the communication partner is checked (step S4).

If it is determined that the ringer tone period is in effect, the reception flag is turned on (= "1") (step S5), the line voltage level of the NCU 31 is monitored again, and the telephone is currently in a call state. It is determined whether or not (step S6).

When it is determined that the communication is not in progress, it is determined whether or not the video on / off switch 7 has been pressed. If not, the process is repeated from step S2 (step S7). ).

On the other hand, in the processing of step S6,
If it is determined that the call is in progress, then it is checked whether the reception flag is on (step S
8) When the reception flag is off (= “0”), the display screen (LC) of the liquid crystal display unit 3 is displayed as in the case where the video on / off switch 7 is pressed in the process of step S7.
D35) is initialized (step S9).

When the initial setting of the LCD 35 is completed, the image data stored in the video memory 22 is read by the image compression / expansion circuit 19 and output to the video memory 23 as it is, so that the image is transferred from the video memory 22 to the video memory 23. Data is moved (step S1)
0).

Next, a key scan is performed to check whether there is an input from the key switch 6 (step S11), and it is determined whether or not the video on / off switch 7 is pressed (step S12). ),
By monitoring the line voltage level of NCU31,
It is determined whether or not the call is currently being made (step S13).

Here, in the judgment processing of steps S12 and S13, the video on / off switch 7
If is not pressed and a call is in progress, the process is repeated from step S10. Further, in the determination processing of steps S12 and S13, when the video on / off switch 7 is not pressed and no call is being made, the screen displayed on the LCD 35 of the liquid crystal display unit 3 is erased ( Step S14) is performed again from the process of step S2. Furthermore, in the determination processing of step S12, the video on / off switch 7
If is pressed, it is determined whether or not a call is currently being made (step S15). If no call is being made,
The process is executed again from step S14 and step S2. On the other hand, when a call is in progress, the process proceeds to the process shown in FIG. 9 described later.

If the reception flag is on (= "1") in the process of step S8, a key scan is performed to check whether there is an input from the key switch 6 (step S16). It is determined whether or not the video on / off switch 7 has been pressed (step S17), and it is determined whether or not the call is currently in progress (step S18).

Here, in the judgment processing of steps S17 and S18, the video on / off switch 7
If is not pressed and the call is in progress, the processing from step S16 is executed again, and in the determination processing of steps S17 and S18, the video on / off switch 7 is pressed. If there is no call and no call is in progress, the above steps S14 and S
The process from step 2 is performed again, while the above step S17 is performed.
If the video on / off switch 7 is pressed in the determination process of step S6, the process proceeds to the process shown in FIG.

FIG. 9 is a flow chart for explaining the processing operation of the CPU 16 following FIG.

If a call is being made in the determination process of step S15, or if the video on / off switch 7 is pressed in the determination process of step S17, the negotiation process is performed (step S21), and the liquid crystal display is displayed. The screen of the unit 3 is initialized (step S22).

Next, the image processing circuit 12 carries out compression / expansion processing of the image data (step S2).
3) The audio processing circuit 13 performs compression / expansion processing of audio data (step S24), and data transmission / reception is performed by communication processing (step S25).

Then, a key scan is performed to check whether or not there is an input from the key switch 6 (step S26), and it is determined whether or not the telephone call is currently in progress (step S27).

If a call is in progress, the above step S2 is performed.
When the process from step 3 is executed again and the call is not in progress, FIG.
The processing is executed again from the processing of steps S14 and S2 described above.

The compression / expansion processing of image data in step S23, the compression / expansion processing of audio data in step S24, and the data communication processing in step S25 will be described below. Since the portable videophone device 1 of the present embodiment simultaneously executes image data processing and audio data processing in parallel in the transmission processing and the reception processing, in the following, they are divided into the transmission processing and the reception processing, respectively. Explain.

(Transmission Processing) The image data taken by the camera unit 2 is A / D converted by the ADC 21,
Image data corresponding to one screen output from the ADC 21 in response to a trigger signal from the CPU 16 is stored in the video memory 2
Taken in 2. The image data captured in the video memory 22 is compressed by the image compression / expansion circuit 19 and temporarily stored in the buffer memory 20. Then, the image data stored in the buffer memory 20 in a compressed state is sequentially read based on a control signal from the CPU 16.

Here, when it is desired to record a self-portrait (transmission image) displayed on the LCD 35 during a call, the image data stored in the buffer memory 20 is stored by the operator depressing the image capturing switch 9. RAM17
Stored in.

In this case, since the data amount of the compressed image data for one screen is 14400 bits (about 1.76 kilobytes), in order to store the compressed image data for 10 screens, the image data is stored in the RAM 17. Storage area is about 1
8 kilobytes is enough.

On the other hand, the voice data input from the telephone set 102 is A / D converted by the ADC 26 from the TEL-side input / output terminal 1T via the NCU 31 and then compressed by the voice compression / expansion circuit 27 to be stored in the buffer memory 28.
Is temporarily stored in. The audio data stored in the buffer memory 28 in a compressed state is stored in the CPU 16
Are sequentially read based on the control signal from.

The CPU 19 sequentially reads the compressed image data and audio data, synthesizes the image data and the audio data, and outputs them to the modem 30. Then, the input compressed data is modulated by the modem 30 and D / A converted, and then the NCU 31 to the LINE side input / output terminal 1L.
Is output to the analog public line via.

(Reception Processing) The compressed image data and audio data are input to the modem 30 from the analog public line via the LINE side input / output terminal 1L and NUC31. The compressed data demodulated by the modem 30 is A / D converted by the DSP in the modem 30 and then output to the bus 15 and sequentially transferred to the CPU 16 via the bus 15.

The CPU 16 separates the combined data into image data and audio data, and temporarily stores the compressed image data in the buffer memory 20 and the compressed audio data in the buffer memory 28.

Next, the image compression / expansion circuit 19 sequentially reads out the written image compressed data from the buffer memory 20 and decompresses it, and writes it in the video memory 23.

Here, when it is desired to record the partner image (received image) displayed on the LCD 35 during a call, the operator depresses the image capture switch 9,
The image data stored in the buffer memory 20 is the RAM 1
Stored in 7.

In this case, as described in the above transmission processing, the data amount of the compressed image data for one screen is about 2.
Since it is 5.8 kilobytes, if the image data storage area of the RAM 17 is 256 kilobytes, about 10
Since 10 screens can be stored, the storage area for 10 screens can be stored in, for example, 3 screens for storing image data for transmission.
The image data for reception can be divided into seven screens and used.

On the other hand, the voice compression / expansion circuit 27 sequentially reads the written voice compression data from the buffer memory 28, decompresses it, and outputs it to the DAC 29 at a constant rate. Then, the decompressed analog voice data is the NCU.
31 from the telephone 102 via the TEL-side input / output terminal 1T
It is output to and can be heard from the handset.

The above-mentioned transmission / reception processing is repeatedly executed until the receiver of the telephone set 102 is placed.

The transmitting operation and the receiving operation will be described below with reference to FIGS. 10 and 11. 10 and 11, on-hook refers to a state in which the handset of the telephone set 102 is placed, off-hook refers to a state in which the handset of the telephone set 102 is lifted, and “during a call” refers to a state after dialing. There is a response from and the conversation has been established.

First, the transmission operation will be described with reference to FIG.

FIG. 10 is a transition diagram of communication states during transmission.

In the on-hook state, when the image on / off switch 7 is pressed once (see (a) in FIG. 10) when the screen display of the LDC 35 in the liquid crystal display unit 3 is turned off, the LCD 35 is in the display state. And the image input by the camera of his / her portable videophone device 1 is displayed on the LCD 3 as a monitor.
It is displayed in 5. In this state, if the video on / off switch 7 is pressed again (see (b) in FIG. 10), the LC
The D display disappears and the original state is restored.

When the receiver is lifted from the on-hook state (see (c) in FIG. 10), the state shifts to the off-hook state.

In the off-hook state, when the screen display of the LDC 35 on the liquid crystal display unit 3 is turned off, the image on / off switch 7 is pressed once (see (d) in FIG. 10), and the LCD 35 is in the display state. As in the case of the on-hook state described above, the camera input image of the portable videophone device 1 on the self side is displayed on the LCD 35 as a monitor. In this state, when the video on / off switch 7 is pressed again (see (e) in FIG. 10), the LCD monitor display disappears and the original off-hook state is restored.

It should be noted that the monitor display is displayed on the LCD 35 in the on-hook and off-hook states (see FIG. 1).
0, the on-hook and off-hook triple lines are drawn) and the handset is raised and lowered ((f) in FIG. 10).
), The state changes from on-hook to off-hook, or from off-hook to on-hook.
There is no change in the monitor display of.

Next, irrespective of whether the LCD 35 is in the monitor display or off, a dial call is made in an off-hook state and a response is established with the other party ((g), (in FIG. 10). (See h)), the state shifts to the talking state, and the LCD 35 becomes the monitor display on its own side. In this state, when the other party hangs up the telephone (see (i) in FIG. 10), the state shifts to the off-hook state, and the monitor display on the LCD 35 also disappears. Further, even when the user hangs up the call during the call (see (j) in FIG. 10), the state shifts to the on-hook state and the monitor display of the LCD 35 disappears.

When the image on / off switch 7 is pressed while the LCD 35 is displaying on the monitor of the own side during a call (see FIG. 1).
(See (k) in 0), communication negotiation is started with the other terminal. As a result, when it is determined that the other terminal and the own terminal cannot communicate with each other (see (l) in FIG. 10), the state before the video on / off switch 7 is pressed is returned to the other terminal. When mutual communication is possible with the own terminal, a videophone section is established (see (m) in FIG. 10), and thereafter, mutual communication between image data and audio data is performed.

In this state, no matter how many times the video on / off switch 7 is pressed, it is ignored (see (n) in FIG. 10). In this state, if the other party hangs up (Fig. 10
(See (o) in the figure), transition to the off-hook state, and
The monitor display of 35 also disappears. Further, even if the receiver puts the handset (see (p) in FIG. 10), the state shifts to the on-hook state and the monitor display on the LCD 35 disappears.

Then, when the receiver is put on while the monitor display of the LCD 35 is off in the off-hook state, the state shifts to the on-hook state (see (q) in FIG. 10).

Next, the receiving operation will be described with reference to FIG. Note that the description of the items described in the above description of the transmission operation will be omitted.

FIG. 11 is a transition diagram of communication states at the time of reception. Incidentally, in FIG. 11, the period shown by the zigzag line shows the ringer tone, that is, the time when the bell of the telephone 102 is ringing.

During the ringer tone interval (see (r) in FIG. 11), the handset is lifted to respond (FIG. 11).
(See (s) in the middle), but the state shifts to the talking state, but at this time, unlike the transmitting side, the monitor display is not displayed on the LCD 35, and remains on. However, when the video on / off switch 7 is pressed once in the on-hook state (see (t) in FIG. 11), the LCD 35 enters the monitor display state, and the self side can be monitored. At this time, a ringer tone is generated (see (u) in FIG. 11), and when the ringer tone is responded to (see (v) in FIG. 11), a call is in progress and the LCD 35 remains on the monitor display. .
By the way, the video on / off switch 7 is effective even in the on-hook state and in the section of the ringer tone.

As described above, in the present embodiment, the image data and audio data compressed by the modulation / demodulation circuit 14 are simultaneously transmitted, and the image compression / decompression circuit 19 is used.
Based on the data compression rate (about 7/100) and the image data transmission rate (4800 bps) of the modulation / demodulation circuit 14, one screen of image data (21200 bits) displayed by the LCD 35 is divided into three. By being transmitted, a high-quality image is transmitted on the analog public line. That is, the screen size of the LCD 35 is 1.4
Since one screen has data of 110 × 160 pixels × 12 bits (4096 colors) = 211200 bits in inches, image data is transmitted at a rate of 1 frame in 3 seconds, but with the change in screen size. As the number of pixels and the number of colors (the number of gradations) of one screen increase and decrease, the time for transmitting the image data for one screen changes.

Specifically, for example, the mode for transmitting image data in 4096 colors is set to the normal mode, and the same number of pixels (1
When the mode for displaying 65536 colors (16 bits) with 10 × 160 pixels) is set to the high image quality mode, when transmitting image data in the high image quality mode, the image data amount for one screen is 110 × 160 × 16 = It becomes 281600 bits (about 34.4 kilobytes), which is 1 when the data is compressed to about 68/1000 by the image compression process.
It is image data of 9200 bits, and this 19200 bits is divided by the number of bits (4800 bits) that can be transmitted in 1 second (that is, 19200/4800 = 4 seconds).
Intermittent still images are transmitted at a rate of one frame. That is, in this case, the image data of 70400 bits (about 8.6 kilobytes) obtained by dividing 281600 bits by 4 is compressed to about 68/1000, and as shown in FIG. 5, a video including the image data of 4800 bits. It is a code.

Further, in the conventional videophone device as shown in FIG. 12, in order to record the image sent, another recording device (for example, an audio cassette tape recorder) is required for recording. However, in the present embodiment, when it is desired to record an image during a call by mounting the large-capacity RAM 17, the desired image can be easily saved by pressing the image capture switch 9.

Further, the conventional videophone device 201 for compressing and transmitting image data and audio data as shown in FIG. 12 is made on the premise that it is of a stationary type, and once installed, it can be moved to another place. Since it was impossible to use, the camera unit 202 as an image input unit and the CRT 20 as an image display unit for transmitting compressed data.
3. Since the telephone 204, which is the voice input / output unit, is integrally configured, it is difficult to reduce the size and weight of the device, it is difficult to obtain a portable device, and the existing telephone cannot be used. In the present embodiment, due to the recent high image quality of the liquid crystal display device, the conventional CRT 203 is used as a display device.
By adopting a color TFT type liquid crystal display device instead of the above, it is possible to reduce the power consumption and to reduce the size and weight of the device. In this case, since the small flat fluorescent tube is used for the backlight used in the liquid crystal display device, the LCD 35 portion can be further thinned, and the size and weight can be significantly reduced.

Further, in the conventional videophone device 201 as shown in FIG. 12, since the camera section 202 is fixed to the device body, the image capturing range is limited. However, the portable television of the present embodiment. As shown in FIG. 2, the telephone device 1 has a camera unit 2 detachably provided from the device body 1a, and the device body 1a and the camera unit 2 are connected by a video cable 2a. The camera unit 2 can be separated from the apparatus main body 1a, and the operator can freely photograph (capture an image) regardless of the arrangement position of the apparatus main body 1a.

Furthermore, by providing a composite video input / output terminal, an analog / digital RGB input / output terminal, or the like as the video input terminal 36 and the video output terminal 37 provided on the liquid crystal display section 3, the video cassette recorder (V
It is also possible to connect to a video device including a CR) or a television (TV), a computer, or the like. For example, by connecting a TV tuner or the like having a video output terminal, the liquid crystal display unit 3 can be used as a liquid crystal television. Is also possible.

As described above, in the present embodiment, it is possible to realize high-quality image transmission while making the most of the original feature of the video telephone device that it is possible to make a telephone call while looking at the face of the other party.

The image data compression method is not limited to the JPEG algorithm in this embodiment, and may be, for example, a block coding method, a predictive coding method, an orthogonal transform coding method, or the like. The data compression method is not limited to the CELP algorithm in this embodiment, but may be, for example, AD-PCM (Adaptive Differenti-
al Palse Code Modulation) method, VSELP (Vector
A Sum Excited Linear P-rediction) method or the like may be used.

[0147]

According to the present invention, according to the first aspect of the invention, the modulation / demodulation circuit, the image processing circuit, and the audio are provided in a housing that is integrally provided with a camera section and a liquid crystal display section. By incorporating the processing circuit into an existing telephone and using the processing circuit, it is possible to reduce the size and weight. In this case, as the backlight of the liquid crystal display unit, as in the invention according to claim 2. By using a flat fluorescent tube,
The liquid crystal display unit can be made thinner, and the overall size and weight can be further reduced and portability can be improved.

According to the third aspect of the present invention, the housing has the detachably provided battery section,
It is possible to facilitate mobile use.

Therefore, by adopting the liquid crystal display device, the size and weight can be reduced and the portability can be improved.

[Brief description of drawings]

FIG. 1 is an external view showing a portable videophone device of the present invention.

FIG. 2 is a diagram showing a state in which a camera unit of FIG. 1 is removed.

FIG. 3 is a diagram for explaining a connection relationship of the portable videophone device of FIG.

FIG. 4 is a block diagram showing a schematic configuration of the portable videophone device of FIG.

FIG. 5 is a diagram showing the structure of one frame of a multiplexed code.

FIG. 6 is an exploded perspective view of an LCD.

FIG. 7 is an exploded perspective view of a flat fluorescent tube.

FIG. 8 is a flowchart showing a control operation of a control unit.

9 is a flowchart showing the control operation of the control unit continued from FIG.

FIG. 10 is a transition diagram of communication states during transmission.

FIG. 11 is a communication state transition diagram at the time of reception.

FIG. 12 is an external view showing a conventional videophone device.

[Explanation of symbols]

 1 Portable Video Phone 1a Device Main Unit 1b Power Supply 1L LINE Input / Output Terminal 1T TEL Input / Output Terminal 2 Camera 2a Video Cable 3 Liquid Crystal Display 4 Power Switch 5 Power Indicator 6 Key Switch 7 Video On / Off Switch 8 Image switch 9 Image capture switch 11 Control circuit 12 Image processing circuit 13 Audio processing circuit 14 Modulation / demodulation circuit 15 Bus 16 CPU 17 RAM 18 ROM 19 Image compression / expansion circuit 20 Buffer memory 21 ADC 22 Video memory 23 Video memory 24 DAC 25 Image input terminal 26 ADC 27 Audio compression / expansion circuit 28 Buffer memory 29 DAC 30 Modem 31 NCU 32 Lens 33 CCD 34 DD 35 LCD 35a Front shield case 35a1 Screen display opening 35a2 Insulation tape 35a3 Insulation tape 35b Liquid crystal display unit 35b1 Scan driver circuit 35b2 Data driver circuit 35b3 Liquid crystal panel 35b4 Flexible substrate 35c Rear shield case 35c1 Backlight opening 35c2 Double-sided tape 35c3 Double-sided tape 35c4 Double-sided tape 36 Video input terminal 37 Terminal 38 Flat fluorescent tube 38a Front glass panel 38b Rear glass panel 38c Frame glass 38d, 38e Lead piece 38f Exhaust tube 38g Fluorescent surface 39 Resin sheet 40, 41 Double-sided tape 42 Shield case 43 Spacer 44 Board 45 Lead wire 46 Connector 47, 48 Double-sided tape 49 Insulating tape 101 Modular jack type outlet 102 Telephone 103 Modular plug 104 Module Cable 201 Videophone device 202 Camera unit 203 Display unit 204 Telephone 205 Key input unit

[Procedure amendment]

[Submission date] March 22, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0100

[Correction method] Change

[Correction content]

When it is determined that the communication is not in progress, it is determined whether or not the video on / off switch 7 has been pressed (step S7). If not, the process is repeated from step S2. It As a result, the loop A is configured in a state where the video on / off switch 7 is not pressed, not in the call state.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0103

[Correction method] Change

[Correction content]

Next, a key scan is performed to check whether there is an input from the key switch 6 (step S11), and it is determined whether or not a call is in progress by monitoring the line voltage level of the NCU 31. At the same time (step S12), when the call is not in progress, it is determined whether or not the video on / off switch 7 has been pressed (step S13).

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0104

[Correction method] Change

[Correction content]

If the image on / off switch 7 is not pressed in the determination process of step S13, the process is repeated from step S10. As a result, the loop B is formed in a state where the video on / off switch 7 is pressed instead of the call state. Also,
In the determination processing of step S13, when the video on / off switch 7 is pressed, the screen displayed on the LCD 35 of the liquid crystal display unit 3 is erased (step S1).
4) The process is repeated from step S2. On the other hand, if it is determined in the determination process of step S12 that a call is in progress, the process proceeds to step S16 described below. That is, when not in a call, by pressing the video on / off switch 7 to turn it on,
The image captured by the camera unit 2 of the portable videophone device 1 can be displayed on the LCD 35 of the liquid crystal display unit 3. Further, in this state, the image on / off switch 7 is pressed to turn off the liquid crystal. The display on the LCD 35 of the display unit 3 can be turned off. On the other hand, if it is determined in the determination process in step S6 that the telephone is in the call state, and if the reception flag is subsequently OFF (= "0"), the liquid crystal display unit 3 is operated similarly to the process in step S9. Initial setting of the display screen (LCD 35) is performed (step S1).
5).

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0105

[Correction method] Change

[Correction content]

Then, a key scan is performed to check whether or not there is an input from the key switch 6 (step S16), and it is determined whether or not a call is currently being made (step S17). In the determination process of step S17, if the call is not in progress, the process is repeated from step S14 and step S2 described above. On the other hand, if it is determined in the determination process of step S17 that the telephone call is currently in progress, the video on / off switch 7
It is determined whether or not has been pressed (step S18).

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0106

[Correction method] Change

[Correction content]

In the determination processing of step S18,
If it is determined that the video on / off switch 7 is not pressed, the process is repeated from step S16.
As a result, the loop C in the call state but not transmitting / receiving the video is configured. On the other hand, the above step S18
If the video on / off switch 7 is pressed in the determination process of step S6, the process proceeds to the process shown in FIG.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0108

[Correction method] Change

[Correction content]

When the video on / off switch 7 is pressed in the determination processing of step S18, negotiation processing is performed (step S21), and the screen of the liquid crystal display unit 3 is initialized (step S22).

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0111

[Correction method] Change

[Correction content]

If a call is in progress, the above step S2 is performed.
The processing from 3 is executed again. As a result, a loop D in a call state and transmitting / receiving a video is formed. On the other hand, when the call is not in progress, the processing is repeated from the processing of steps S14 and S2 shown in FIG. That is, when the telephone call is in progress, the image can be transmitted and received by pressing the image on / off switch 7.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Name of item to be corrected] 0127

[Correction method] Change

[Correction content]

FIG. 10 is a transition diagram of communication states during transmission. In the figure, capital letters and steps (S6, S7, S12, S13, S17, S1
8, S27) corresponds to the flowcharts of FIGS. 8 and 9.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0128

[Correction method] Change

[Correction content]

After the power is turned on, in the on-hook state (loop A), when the screen display of the LCD 35 in the liquid crystal display unit 3 is turned off, the video on / off switch 7 is pressed once (see FIG. 8). In step S7 and (a) in FIG. 10, the LCD 35 is in the display state (loop A).
→ Loop B), the camera input image of his / her portable videophone device 1 is displayed on the LCD 35 as a monitor. In this state, when the video on / off switch 7 is pressed again (see step S13 in FIG. 8 and (b) in FIG. 10), the LCD display disappears and the original state is restored (loop B →
Loop A).

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0129

[Correction method] Change

[Correction content]

When the receiver is lifted from the on-hook state (loop A) (see (c) in FIG. 10), the state shifts to the off-hook state.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0130

[Correction method] Change

[Correction content]

In the off-hook state (loop A), when the screen display of the LCD 35 in the liquid crystal display unit 3 is turned off, the image on / off switch 7 is pressed once (step S7 in FIG. 8 and in FIG. 10). (D)), LCD35
Is displayed, and the camera input image of the portable videophone device 1 on the self side is displayed on the LCD 35 as a monitor, as in the case of the on-hook state described above. In this state, when the video on / off switch 7 is pressed again (see step S13 in FIG. 8 and (e) in FIG. 10), L
The monitor display of the CD disappears and the original off-hook state is restored (loop B → loop A).

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0132

[Correction method] Change

[Correction content]

Next, regardless of whether the LCD 35 is in the monitor display or off, the dial call is made in the off-hook state and the response is established with the other party (steps S6, S12 and (G) in FIG.
(See (h)), the state is changed to the talking state, and the LCD 35 becomes the monitor display on its own side (loop C). In this state, when the other party hangs up the telephone (see step S17 in FIG. 8 and (i) in FIG. 10), the state shifts to the off-hook state, and the monitor display on the LCD 35 also disappears (loop C → loop A). In addition, even if the user hangs up the call during a call (step S17 in FIG. 8 and (j) in FIG. 10)
(See), the state shifts to the on-hook state, and the monitor display on the LCD 35 also disappears.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Name of item to be corrected] 0133

[Correction method] Change

[Correction content]

If the video on / off switch 7 is pressed while the LCD 35 is displaying the monitor on its own side during a call (loop C) (step S18 in FIG. 8 and (k) in FIG. 10).
Communication), communication negotiation is started with the other terminal. As a result, when it is determined that the other terminal and the own terminal cannot communicate with each other (see (l) in FIG. 10), the state before the video on / off switch 7 is pressed is returned to the other terminal. When mutual communication with the own terminal is possible, a videophone section is established (see (m) in FIG. 10), and thereafter, mutual communication between image data and audio data is performed (loop C).
→ Loop D).

[Procedure Amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0134

[Correction method] Change

[Correction content]

In this state, no matter how many times the video on / off switch 7 is pressed, it is ignored (see (n) in FIG. 10). In this state (loop D), when the other party hangs up the phone (see step S27 in FIG. 9 and (o) in FIG. 10), the state shifts to the off-hook state, and the monitor display on the LCD 35 also disappears (loop D → Loop A). In addition, even if the receiver puts the handset (step S27 in FIG. 9 and FIG.
(See (p) in the middle), transition to the on-hook state, LCD
The monitor display of 35 also disappears (loop D → loop A).

[Procedure Amendment 15]

[Document name to be amended] Statement

[Name of item to be corrected] 0138

[Correction method] Change

[Correction content]

During the section of the ringer tone (loop A) (see (r) in FIG. 11), when the handset is lifted to respond (see step S6 in FIG. 8 and (s) in FIG. 11), the call is in progress. However, at this time, unlike the transmitting side, the monitor display is not displayed on the LCD 35 and the display is left (loop A → loop C). However, if the video on / off switch 7 is pressed once in the on-hook state (loop A) (step S7 in FIG. 8 and (t) in FIG. 11).
Then, the LCD 35 is in the monitor display state, and the self side can be monitored (loop A → loop B). At this time, a ringer tone is generated (see (u) in FIG. 11), and if a response is made to this ringer tone (see step S12 in FIG. 8 and (v) in FIG. 11), a call is made and the LCD 35 Remains displayed on the monitor. By the way, the video on / off switch 7 is effective even in the on-hook state and in the section of the ringer tone.

[Procedure Amendment 16]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

[Procedure Amendment 17]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

[Figure 9]

[Procedure 18]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

[Figure 10]

[Procedure Amendment 19]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 11

[Correction method] Change

[Correction content]

FIG. 11

Claims (3)

[Claims] 1. A camera unit for capturing a subject image as image data, and a liquid crystal display unit for displaying predetermined image data, which is integrally provided in a housing connected to a predetermined communication line. And a first input / output terminal for inputting / outputting voice data and a second input / output terminal for inputting / outputting voice data by connecting to a telephone, and a mobile phone for simultaneously transmitting / receiving image data and voice data via the communication line. Type videophone device, wherein a modulation / demodulation circuit for modulating data output through the first input / output terminal and demodulating data input through the first input / output terminal in the housing And encoding and compressing the image data taken in from the camera unit, outputting the compressed compressed image data to the communication line from the modulation / demodulation circuit, and demodulating from the modulation / demodulation circuit. It decompresses and decodes the compressed image data,
An image processing circuit for outputting the decompressed decompressed image data to the liquid crystal display unit, and encoding and compressing voice data taken in from the telephone via the second input / output terminal, and the compressed compressed voice data is modulated by the modulation. .A compressed voice data which is output from the demodulation circuit through the communication line and demodulated by the modulation / demodulation circuit is decoded and expanded, and the expanded expanded voice data is transmitted through the second input / output terminal to the telephone. A portable videophone device having a built-in audio processing circuit for outputting to. 2. The portable videophone device according to claim 1, wherein the liquid crystal display unit has a backlight device including a flat fluorescent tube. 3. The portable videophone device according to claim 1, wherein the housing has a battery portion that is detachably provided.