JP4552762B2 - Electronic equipment - Google Patents

Description

The present invention relates to an electronic equipment having a built-in devices requiring high-speed data transfer such as a display device or an imaging device.

  In recent years, the functions of mobile phones, notebook computers, digital cameras, etc. have improved dramatically, and higher resolution and higher definition of display elements and imaging elements built into these electronic devices have become increasingly complex. Yes. In particular, mobile phones are required to have built-in camera functions, larger display sizes, higher functionality, smaller size, lighter weight, and lower power consumption, and the housing structure is also a folding type called clamshell type or flip type. It is becoming mainstream.

FIG. 13 is a block diagram showing a typical configuration of an electronic device using an active matrix liquid crystal display as a display element, and FIG. 14 is a time chart thereof.
As illustrated in FIG. 13, the CPU 1301 generates image data to be displayed by decompressing or calculating a compressed image or moving image data in JPEG format or MPEG format. Then, when generating image data to be displayed, the CPU 1301 writes the image data into the video memory 1302. The liquid crystal controller 1303 generates various timings necessary for liquid crystal display, that is, the X clock signal 1315 and the horizontal synchronizing signal 1314 of the X driver 1313 and the vertical synchronizing signal 1318 of the Y shift register 1307, and the order to be displayed from the video memory 1302. Are read out and sent to the drivers (X driver 1313 and Y shift register 1307) of the liquid crystal display 1308. Here, the X driver 1313 includes an m-stage X shift register 1304, an m-word latch 1305, and m DA conversion circuits 1306 when the pixels of the liquid crystal display 1308 are configured by n rows and m columns. .

  When the liquid crystal controller 1303 reads the first pixel of the display frame, it generates a vertical synchronization signal 1318 and sends it to the Y shift register 1307. At the same time, the liquid crystal controller 1303 reads data to be displayed on the pixel in the first row and first column of the liquid crystal display 1308 from the video memory 1302 and sends the data as a display data signal 1316 to the data terminal of the latch 1305.

  As shown in FIG. 14, the X shift register 1304 reads the horizontal synchronization signal 1314 generated by the liquid crystal controller 1303 in synchronization with the X clock signal 1315 (FIGS. 14A and 14B). A signal X1 latch for latching image data is generated (FIG. 14C). The data displayed on the pixel in the first row and the first column is latched in the first column of the latch 1305 by the signal X1 latch. Subsequently, the liquid crystal controller 1303 reads data to be displayed on the next pixel from the video memory 1302 and outputs the data to the data terminal of the latch 1305. When data to be displayed on the next pixel is output to the data terminal of the latch 1305, the X shift register 1304 of the X driver 1313 shifts the horizontal synchronization signal 1314 by one, and the image data in the second column is changed. A signal X2 latch for latching is generated (FIG. 14D), and the image data of the first row and the second column is latched by the latch 1305.

  Thereafter, the X shift register 1304 sequentially shifts the horizontal synchronization signal 1314 and causes the latch 1305 to sequentially latch the data to be displayed in the first row. When the latch 1305 finishes storing the data for one row, the next horizontal synchronizing signal 1314 is output (FIGS. 14A and 14H, and in FIG. 14, the same as (A) to (F). Note that the time scale of the horizontal axis in FIGS. (G) to (k) has changed, so the horizontal sync signal, which is the same signal, is reprinted in addition to (a). The conversion circuit 1306 DA converts the data held in the latch 1305 and outputs it to the i-th (1 ≦ i ≦ m) of the column electrode 1310. At the same time, the Y shift register 1307 outputs a selection signal Y1 to the row electrode 1309 of the first row.

Similarly, the Y shift register (Y driver) 1307 sequentially shifts the selection signal Yj output to the jth (1 ≦ j ≦ n) of the row electrode 1309 every time the horizontal synchronization signal 1314 is output.
A circle indicated by a one-dot chain line in FIG. 13 is an enlarged view of one pixel portion of the liquid crystal display 1308 arranged in a matrix. When the j-th row electrode 1309 is selected, the active switch element 1311 transmits the output of the DA conversion circuit 1306 output to the i-th column electrode 1310 to the pixel electrode 1312 in the j-th row and i-th column. Note that one D / A converter circuit 1306 may be provided on the liquid crystal controller 1303 side, and the display data signal 1316 may be transmitted as an analog signal. In this case, the latch 1305 is an analog sample and hold circuit. Although this method can reduce the number of DA conversion circuits 1306 and has been used in the past, the average value of the voltage finally applied to the pixel electrode 1312 is a predetermined value even though the DA conversion circuit 1306 is used. Since a digital circuit can be used for pulse width modulation and an analog sample-and-hold circuit is not required, the method described with reference to FIG.

However, in the method of FIG. 13, since the display data signal 1316 is sent as a digital signal, the number of signal lines becomes very large. In order to send the display data signal 1316, for example, a total of 24 bits of 8 bits × 3 primary colors are used. A signal line is required.
It should be noted that after the display data signal 1316 at the right end of the screen row is output from the liquid crystal controller 1303, the time until the display data signal 1316 at the left end of the next row is output, or the display data signal 1316 at the bottom row of the screen. Is the time from when the display data signal 1316 of the first row of the next frame is output is called a (horizontal, vertical) blanking period or blanking period. Although it cannot be zero because of reciprocation, the liquid crystal display 1308 may be zero because the selection of the pixel electrode 1312 is performed by the switching operation of the active switch element 1311. FIG. 14 illustrates a case where a horizontal blanking period for one pixel and a vertical blanking period for one row are taken.

In an electronic device using an image sensor such as a digital camera, the direction of signal transmission is reversed from that in the case of using the liquid crystal display 1308, and a similar circuit configuration is taken.
In an electronic device incorporating such a display element and an imaging element, there is a demand for a large display, high resolution, and small size and light weight. For this reason, there are often a plurality of mounting boards on which the electronic device of FIG. 13 is mounted. In that case, the mounting boards are often separated by the one-dot chain line 1317-1317 ′ in FIG.

However, if the mounting substrate is divided, the connection between the CPU 1301 and the liquid crystal display 1308 becomes long. In addition, when an image sensor is mounted in the configuration of FIG. 13, the signal transmission direction is reversed and the same circuit configuration is used as in the case of using the liquid crystal display 1308, and therefore, the CPU 1301 and the image sensor are not connected. The connection between them becomes longer.
In addition, as described above, a number of signal lines for transmitting the display data signal 1316 and the like from the liquid crystal controller 1303 side to the liquid crystal display body 1308 side are necessary in parallel, but in order to reduce the number of signal lines, they are rearranged. -It is conceivable to perform serial-to-parallel conversion and transmit data serially. However, with the conventional technology, the amount of data that can be transmitted per transmission line is small, and it is already due to the demand for high-speed transmission due to the recent complexity of equipment. The transmission capacity per line is exceeded. Therefore, in the conventional technology, it is very difficult to reduce the number of transmission lines by serialization, and it is unavoidable to perform parallel transmission using many lines.

That is, as the resolution of the liquid crystal display body 1308 and the image sensor increases, the frequency of signals sent through these lines increases, making it difficult to connect to the CPU 1301 and the liquid crystal controller 1303 side. In particular, the clamshell structure has a structure in which both are connected via a thin hinge portion. For this reason, as the resolution of the liquid crystal display 1308 and the image sensor increases, the amount of data exchanged between the two boards when the mounting boards are separated by the one-dot chain line 1317-1317 ′ in FIG. It is extremely difficult to pass through several transmission lines through a thin hinge using In order to solve this problem, a method has been proposed in which data to be transmitted is serialized and transmitted at high speed with a small number of transmission lines. As a method for high-speed data transmission, for example, it has been proposed to use LVDS (Low Voltage Differential Signaling) for connection of a liquid crystal display 1308 and an image sensor (Patent Document 1 and Patent Document 2). In Patent Document 3 and Patent Document 4 and the like, a new method is also proposed because sufficient resolution cannot be obtained even with this method.
Patent publication 3086456 (column 44) Patent publication 3330359 (column 46) Patent publication 3349426 Patent publication 3349490

  However, in these conventional techniques, when the amount of data to be transmitted increases, the data rate increases and causes various difficulties. For example, a digital baseband signal to be transmitted has a frequency component several times the transmission rate from DC, and its ratio band is very large. Distortion due to the frequency characteristics of the transmission path has a fatal effect on the quality of data transfer. There was a problem of affecting. Furthermore, since sufficient transmission power is required on the transmission side in order to secure a logic level at the data receiving end, there is a problem of causing interference to surroundings due to power consumption and unnecessary radiation.

  That is, a large signal power is originally required to secure a logic level at the power receiving end. In addition, matched impedance termination is required to transmit signals accurately, but the transmission impedance is at most 100 ohms, so the power consumed by these termination resistors is unacceptably large. End up. Furthermore, since the ratio band of the transmitted signal is very large, the impedance of the transmission line is not constant within the band, and the frequency characteristics change depending on the mounting status and the routing of the wiring. Not easy. In particular, the characteristics of the transmission / reception circuit built in the semiconductor integrated circuit are basically difficult to match the transmission impedance inherent to each circuit because the semiconductor integrated circuit is generally used for various circuits. It must be used in a mismatched state. This further makes it difficult to correctly transmit high-speed data signals.

  Furthermore, when the mounting substrate is divided by the one-dot chain line 1317-1317 ′ in FIG. 13, it is necessary to transmit a large amount of data at a high speed through a line routed by a long wiring. For this reason, the radiated electromagnetic field from the line increases, which causes electromagnetic interference to other electronic devices or magnetic circuits. In the conventional signal transmission through the signal line, the amplitude level at the power receiving end is defined, and even if sufficient quality can be ensured at the power receiving end, the amplitude level of the signal cannot be lowered. That is, EMI countermeasures become difficult, resulting in restrictions on circuit design and cost increase. On the transmitting side, in addition to the load at the receiving end, the stray capacitance of the line is also driven at the same time, so extra energy is required for signal transmission. That is, the result is an increase in power consumption.

In the prior art, the transfer data rate per transmission line is limited, and in order to perform high-speed data transmission, it is necessary to parallelize the lines. As the number of wires increases with the increase in data transmission speed, the physical space for wiring increases, which naturally imposes great restrictions on circuit design.
In particular, when the wiring passes through a movable part such as a hinge part in a clamshell type structure, etc., the characteristic impedance changes depending on the bending state of the movable part, so impedance mismatch occurs depending on the situation, and the signal is reflected by reflection at the bent part, etc. Causes deterioration. For this reason, there are problems that the speed of data to be transmitted is limited and that the mounting method and the arrangement of parts are restricted.

  In addition, in order to cope with the high resolution and high speed of the display element and the imaging device, the number of signals exchanged through the hinge portion is several tens, and when the wiring passes through the hinge portion, Since the wiring on the board cannot be used, the flexible board is connected through the connector. The connection using a flexible substrate or a connector has the disadvantages of high cost and low connection reliability.

Therefore, the present invention provides a high-speed transmission of data having various problems and limitations as described above in signal transmission between these circuits in an electronic device such as a mobile phone that incorporates a display body, an image sensor, etc. It shows the way to remove the drawbacks and limitations of conventional information transmission method, and to realize a highly reliable electronic equipment at a low cost.

  In the electronic device according to one aspect of the present invention, the first housing unit, the second housing unit, and the positional relationship between the first housing unit and the second housing unit can be changed. A connecting portion for connecting the first housing portion and the second housing portion, a first circuit portion mounted on the first housing portion, and a second circuit portion mounted on the second housing portion A first internal communication control unit mounted on the first housing unit and a second internal communication control unit mounted on the second housing unit, the first and second internal units The communication control unit controls communication performed between the first and second circuit units, and the first or second internal communication control unit receives and supplies power to and receives at least a part of information from the connecting unit. Communication is performed through the means.

  According to the above configuration of the present invention, in an electronic device in which a circuit is divided and housed in two housings, such as a clamshell structure, a signal is exchanged between the housings by energizing a connecting portion that connects the housings. Therefore, it is possible to significantly reduce the number of signal lines connecting between the casings. This simplifies the structure of the electronic device and is effective in reducing the cost and improving the reliability of the device.

  The first or second internal communication control unit of the electronic device according to one aspect of the present invention includes a generation unit that generates data as a serial signal, an oscillation unit that generates a carrier wave, and a signal of the generation unit that generates the carrier wave. Modulation means for modulating the signal by the power supply means, power supply means for feeding the signal generated by the modulation means to the connecting section, and demodulation means for receiving and demodulating the signal generated by the modulating means connected to the connecting section. It is characterized by.

  According to the above configuration of the present invention, a carrier wave is generated and modulated by a signal exchanged between serialized casings, thereby reducing the number of necessary transmission paths and reducing a ratio band of a signal to be transmitted. Thus, even a connector that is not necessarily designed as a transmission line, such as a fitting of a connection part that connects the casings, can be used as a transmission line. As a result, the number of signal lines connecting between the housings can be significantly reduced, the structure of the electronic device is simplified, and the cost of the device is reduced and the reliability is improved.

The oscillation means for generating the carrier wave of the electronic device according to one aspect of the present invention has an optimal transmission characteristic when performing signal transmission in a positional relationship between the first casing portion and the second casing portion. It is characterized by oscillating the frequency it has.
According to the above configuration of the present invention, the carrier frequency of the signal transmitted through the connecting portion is automatically adjusted to the optimum frequency according to the characteristics of the connecting portion by the characteristics of the oscillating means. Communication characteristics can be maintained.

The power supply / reception unit of the electronic device according to one aspect of the present invention is set at a position where the position of the power supply / reception point has appropriate transmission characteristics when signal transmission is performed at the position of the power supply / reception point. It is characterized by being.
According to the above-described configuration of the present invention, it is possible to ensure good transmission characteristics by appropriately setting the power feeding position for feeding power to the connecting portion, thereby maintaining good communication characteristics. .

  In the electronic device according to one aspect of the present invention, the first housing unit, the second housing unit, and the positional relationship between the first housing unit and the second housing unit can be changed. A connecting portion that connects the first housing portion and the second housing portion, a display portion mounted on the second housing portion, a first circuit portion mounted on the first housing portion, A second circuit unit that is mounted on the second casing unit and includes a control circuit for the display unit, a generation unit that generates data exchanged between the first and second circuit units as a serial signal, and a carrier wave Oscillating means, modulating means for modulating the carrier wave with the signal of the generating means, power supply means for feeding the signal generated by the modulating means to the connecting portion, and generating the modulating means connected to the connecting portion And demodulating means for receiving and demodulating the signal.

  According to the above configuration of the present invention, in a transmission apparatus having a display unit and its control unit, the circuit part of which is divided and housed in two housings and connected by the connection unit, between the control unit and the display unit This signal transmission can be performed by energizing the connecting portion. As a result, the number of signal lines connecting between the housings can be significantly reduced, the structure of the electronic device is simplified, and the cost of the device is reduced and the reliability is improved.

  In the electronic device according to one aspect of the present invention, the first housing unit, the second housing unit, and the positional relationship between the first housing unit and the second housing unit can be changed. A connecting portion for connecting the first housing portion and the second housing portion, a display portion mounted on the second housing portion, and an image sensor mounted on the first or second housing portion; A first circuit unit including a control circuit for the imaging element mounted on the first housing unit, a second circuit unit mounted on the second housing unit and including a control circuit for the display unit, Generation means for generating data exchanged between the first and second circuit units as a serial signal, oscillation means for generating a carrier wave, modulation means for modulating the carrier wave by a signal of the generation means, and generation of the modulation means Power supply means for feeding the signal to be connected to the connecting section, and the modulation means connected to the connecting section generates Characterized in that it comprises a demodulation means for receiving and demodulating No..

According to the above configuration of the present invention, in an electronic apparatus having an image sensor, signal transmission between the control unit and the image sensor and the display unit can be performed by energizing the connecting unit. As a result, the number of signal lines connecting between the housings can be significantly reduced, the structure of the electronic device is simplified, and the cost of the device is reduced and the reliability is improved.
An electronic device according to an aspect of the present invention is an electronic device in which a first housing portion and a second housing portion are connected via a connecting portion so that the positional relationship can be changed, and the first housing The data transmission between the unit and the second housing unit is performed through the connection unit.

  According to the above configuration of the present invention, in an electronic device in which a circuit is divided and housed in two housings, such as a clamshell structure, a signal is exchanged between the housings by energizing a connecting portion that connects the housings. Thus, it is possible to significantly reduce the number of signal lines connecting between the casings. This simplifies the structure of the electronic device, and is effective in reducing the cost and improving the reliability of the device.

The electronic apparatus according to an aspect of the present invention further includes frequency conversion means for converting a signal band of transmission data transmitted through the coupling unit into a frequency band centered on a carrier wave.
According to the above-described configuration of the present invention, even a high-speed wide-band data signal such as display data is not necessarily designed as a transmission line such as a connecting part by reducing the ratio band. In addition, since data transmission is possible and the frequency used for data transmission is high, the components constituting them can be easily reduced in size and the mounting space can be saved.

An electronic apparatus according to an aspect of the present invention further includes a wired transmission path that transmits a reference signal for generating the carrier wave to the demodulation side.
According to the above configuration of the present invention, since the carrier frequency can be completely matched between the transmission side and the reception side, the phase adjustment of the synchronous detection is facilitated, and the oscillation accuracy of the oscillation circuit is not a problem. Cost reduction effect can be obtained.

  The wireless communication terminal according to one aspect of the present invention can change the positional relationship between the first housing unit, the second housing unit, and the first housing unit and the second housing unit. A connecting portion for connecting the first housing portion and the second housing portion; an external wireless communication antenna mounted on the first housing portion or the second housing portion; and the first housing. And an external wireless communication control unit that mainly controls external wireless communication performed via the external wireless communication antenna, a display unit mounted on the second casing unit, and the first casing The first signal transmitting / receiving unit for internal communication between the first casing unit and the second casing unit using the connecting unit as a transmission path, and the connecting unit mounted on the second casing unit A second signal transmission / reception unit for internal communication between the first housing unit and the second housing unit using a part as a transmission path And butterflies.

  According to the above configuration of the present invention, in a wireless communication terminal having an external wireless communication control unit like a mobile phone and the circuit of which is divided and housed in two housings, the external wireless communication control unit takes in the wireless communication terminal. In order to display the data, it is possible to transmit a signal exchanged between the cases by energizing the connecting part of the cases. As a result, the number of signal lines connecting between the housings can be remarkably reduced, the structure of the wireless communication terminal is simplified, and the cost of the apparatus is reduced and the reliability is improved.

  The wireless communication terminal according to one aspect of the present invention can change the positional relationship between the first housing unit, the second housing unit, and the first housing unit and the second housing unit. A connecting portion that connects the first housing portion and the second housing portion; and the first housing portion and the second housing portion that are mounted on the first housing portion and that use the connecting portion as a transmission path. A first signal transmission / reception unit for internal communication between the first casing unit and the second casing unit mounted on the second casing unit as a transmission path A second signal transmission / reception unit, a first internal signal transmission control unit that is mounted on the first housing unit and controls transmission / reception switching and control of internal communication performed via the connection unit, and the second housing A second internal signal transmission control unit that is mounted on the body and controls transmission / reception switching and control of internal communication performed via the connecting unit. The electronic device according to claim Rukoto.

  According to the above configuration of the present invention, it is possible to perform internal communication performed via the connecting unit in two directions. For example, the display unit and the imaging unit are provided in the first housing, and the data processing unit is provided in the second housing. In the electronic device, the data captured by the imaging unit of the first housing is sent to the processing unit of the second housing through the connecting unit, and the data is processed by the processing unit, and then the first housing through the connecting unit. It is possible to perform an operation such as sending to a display unit on the body and displaying it. In this way, even when a large amount of data is exchanged bi-directionally between cases, communication is performed by supplying power to the connecting part between cases, so the number of signal lines to be connected can be significantly reduced. The structure of the electronic device is simplified, which is effective in reducing the cost and improving the reliability of the device.

  As described above, according to the above-described configuration of the present invention, the number of wires necessary for data transmission in the circuit of the electronic device can be greatly reduced, and various problems associated with conventional high-speed data transmission can be reduced. A mounting problem can be eliminated, and an electronic device with low cost, high reliability, and low power consumption can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a state when a clamshell mobile phone is opened as an example of a wireless communication terminal of the present invention, and FIG. 2 is a closed clamshell mobile phone as an example of the wireless communication terminal of the present invention. FIG.
In FIG. 1 and FIG. 2, an operation button 4 is disposed on the surface of the first housing unit 1, and a microphone 5 is provided at the lower end of the first housing unit 1. An external wireless communication antenna 6 is attached to the upper end. In addition, a display body 8 is provided on the surface of the second housing portion 2, and a speaker 9 is provided on the upper end of the second housing portion 2. In addition, a display body 11 and an imaging element 12 are provided on the back surface of the second housing portion 2. As the display bodies 8 and 11, for example, a liquid crystal display panel, an organic EL panel, a plasma display panel, or the like can be used. As the image sensor 12, a CCD or CMOS sensor can be used.

  And the 1st housing | casing part 1 and the 2nd housing | casing part 2 are connected via the hinge 3, and the 2nd housing | casing part 2 is made into 1st by rotating the 2nd housing | casing part 2 by using the hinge 3 as a fulcrum. It can be folded on the housing part 1. The operation button 4 can be protected by the second housing unit 2 by closing the second housing unit 2 on the first housing unit 1, and the operation button 4 may be mistaken when carrying a mobile phone. Operation can be prevented. Further, by opening the second housing part 2 from the first housing part 1, the operation button 4 can be operated while viewing the display body 8, a telephone call can be made using the speaker 9 and the microphone 5, and the operation button 4 can be operated. Imaging can be performed while operating. In order to secure the strength of the hinge 3, the hinge 3 can be made of a conductor such as metal.

Here, by using the clamshell structure, the display body 8 can be disposed on almost the entire surface of the second housing portion 2, and the size of the display body 8 can be increased without deteriorating the portability of the mobile phone. It is possible to improve visibility.
In addition, the first housing unit 1 and the second housing unit 2 are respectively provided with modem circuits 7 and 10. The input / output of these modulation / demodulation circuits 7 and 10 are connected to the hinge 3 and energized, whereby data transmission between the first casing unit 1 and the second casing unit 2 can be performed through the hinge 3. Although details of the modulation / demodulation circuits 7 and 10 will be described later, a modulation circuit, a demodulation circuit, and a switch for switching their functions are provided. When one of the modulation / demodulation circuits 7 and 10 functions as a modulation circuit, the other modulation / demodulation circuits 7 and 10 are provided. Can operate as a demodulation circuit. That is, when the modulation / demodulation circuit 7 is set to operate as a modulation circuit and the modulation / demodulation circuit 10 operates as a demodulation circuit, for example, image data and sound taken into the first casing unit 1 via the external wireless communication antenna 6. Data can be sent to the second casing 2 via the hinge 3 to display an image on the display body 8 or to output sound from the speaker 9. If the functions of the modulation / demodulation circuits 7 and 10 are set in reverse, for example, the image data captured by the image sensor 12 is sent from the second casing unit 2 to the first casing unit 1 and the antenna for external wireless communication is transmitted. 6 to the outside.

  As a result, data transmission between the first housing part 1 and the second housing part 2 can be performed by the conductive part of the hinge 3, and it is necessary to pass a multi-pin flexible wiring board through the hinge 3. Disappear. For this reason, it becomes possible to suppress the complexity of the structure of the hinge 3 and to prevent the mounting process from becoming complicated, thereby reducing the size and thickness of the mobile phone and increasing the reliability while suppressing an increase in cost. It is possible to increase the screen size and functionality of the mobile phone without impairing the portability of the mobile phone.

  The external wireless communication antenna 6 is mounted on the first casing 1, but may be mounted on the second casing 2. When the external wireless communication antenna 6 is attached to the second housing portion 2, the external wireless communication antenna 6 is not blocked by the second housing portion 2 when a mobile phone is used, and efficient communication can be expected. . In this case, power is supplied to the external wireless communication antenna 6 from the communication control unit of the mobile phone built in the first housing unit 1 by a coaxial cable or the like.

FIG. 3 is a perspective view showing the appearance of a rotary mobile phone to which the signal transmission control method of the present invention is applied.
In FIG. 3, an operation button 24 is disposed on the surface of the first housing portion 21, a microphone 25 is provided at the lower end of the first housing portion 21, and an upper end of the first housing portion 21 is provided. An external radio communication antenna 26 is attached. A display body 28 is provided on the surface of the second housing part 22, and a speaker 29 is provided on the upper end of the second housing part 22. Further, the first casing unit 21 and the second casing unit 22 are respectively provided with modulation / demodulation circuits 27 and 30 that perform internal signal transmission between the first casing unit 21 and the second casing unit 22. Yes.

  And the 1st housing | casing part 21 and the 2nd housing | casing part 22 are connected through the hinge 23, and the 2nd housing | casing part 22 is made to rotate by rotating the 2nd housing | casing part 22 horizontally by using the hinge 23 as a fulcrum. The first housing portion 21 can be placed on top of the first housing portion 21, or the second housing portion 22 can be shifted from the first housing portion 21. The operation button 24 can be protected by the second housing portion 22 by arranging the second housing portion 22 on the first housing portion 21, and the operation button 24 can be used when carrying the mobile phone. Can be prevented from being operated by mistake. Further, by rotating the second housing portion 22 horizontally and shifting the second housing portion 22 from the first housing portion 21, the operation button 24 can be operated while viewing the display body 28, the speaker 29 and It is possible to talk while using the microphone 25. In order to secure the strength of the hinge 23, the hinge 23 can be made of a conductor such as metal.

  Here, the first housing portion 21 and the second housing portion 22 are respectively provided with modulation / demodulation circuits 27 and 30. By connecting the input / output of the modulation / demodulation circuits 27 and 30 to the hinge 23 and energizing it, data transmission between the first casing portion 21 and the second casing portion 22 can be performed through the hinge 23. Although details of the modulation / demodulation circuits 27 and 30 will be described later, when the modulation circuit, the demodulation circuit, and a switch for switching their functions are provided, and when one of the modulation / demodulation circuits 27 and 30 functions as the modulation circuit, the other modulation / demodulation circuit 27 , 30 can operate as a demodulation circuit. In other words, when the modulation / demodulation circuit 27 is set to operate as a modulation circuit and the modulation / demodulation circuit 30 operates as a demodulation circuit, for example, image data and sound taken into the first casing portion 21 via the external wireless communication antenna 26. Data can be sent to the second housing portion 22 via the hinge 23 to display an image on the display body 28 or to output sound from the speaker 29.

  As a result, it is not necessary to pass the flexible wiring board having a large number of pins through the hinge 23, and it is possible to suppress the complexity of the structure of the hinge 23 and to prevent the mounting process from becoming complicated. . For this reason, it is possible to reduce the size and thickness of the mobile phone and increase the reliability while suppressing an increase in cost, and to increase the screen size and functionality of the mobile phone without impairing the portability of the mobile phone. Can be achieved.

FIG. 4 is a block diagram showing a more detailed configuration of the information transmission method according to the present invention and an embodiment of an electronic apparatus using the same.
In FIG. 4, a portion below the one-dot chain line 427 is a first housing portion in which a control unit of the main body is accommodated, and an upper portion is a second housing portion in which a display body is accommodated. And these 1st housing | casing parts and 2nd housing | casing parts are connected via the hinge 429. FIG. In addition, a modulation circuit 408 is provided in the first housing portion, and a demodulation circuit 414 is provided in the second housing portion, and an output from the modulation circuit 408 is transmitted to the demodulation circuit 414 via the hinge 429. Can do.

  Then, the CPU 401 acquires data via communication (including the function of a mobile phone) and a peripheral input / output device (not shown), or generates display data 419 to be displayed by calculation of the CPU 401 itself. Record in the memory 402. The oscillation circuit 426 is an oscillation circuit that generates a clock pulse train necessary for the operation of the CPU 401 and the liquid crystal controller 403. The liquid crystal controller 403 divides the clock pulse generated by the oscillation circuit 426, generates various timings, and also generates the horizontal synchronization signal 420 and the vertical synchronization signal 421.

  Then, the liquid crystal controller 403 reads display data 419 to be displayed on the display body from the video memory 402 according to a predetermined order, and outputs it together with the vertical synchronization signal 421 and the horizontal synchronization signal 420. Since the display data 419 is normally read out from the video memory 402 as parallel data for each word in units of pixels, the display data 419 is converted into parallel data by the parallel-to-serial conversion circuit 404 and transmitted to the logic circuit 407. The logic circuit 407 receives the signal output from the parallel-to-serial conversion circuit 404, the horizontal synchronization signal 420 and the vertical synchronization signal 421 output from the liquid crystal controller 403, and generates a packet. The logic circuit 407 also performs synchronization. A preamble for adjusting detection timing and the like is added to the packet. The horizontal synchronization signal 420 is also supplied to the PLL 409, and the PLL 409 multiplies the horizontal synchronization signal 420 to generate a carrier wave. That is, the carrier wave is synchronized with the horizontal synchronization signal 420.

  The packet generated by the logic circuit 407 is output to the modulation circuit 408, modulated by the modulation circuit 408 by the carrier frequency generated by multiplying the horizontal synchronization signal 420 by the PLL 409, and fed to the metal portion of the hinge 429. Are transmitted to the second casing. Further, the horizontal synchronization signal 420 is separately transmitted to the second casing unit through the wired transmission path 428, and used as a reference for synchronous detection for demodulation and packet synchronization. As a result, the preamble portion in the packet can be easily detected, and the carrier frequency can be completely matched with the transmission side, so that the phase adjustment of the synchronous detection is easy.

  The occupied band of the display data 419 is increased by the parallel-to-serial conversion circuit 404. This signal is modulated to a higher frequency by the modulation circuit 408. However, the ratio band, that is, the ratio between the occupied bandwidth and the center frequency is reduced by the modulation. As a result, even a high-speed wide-band data signal such as display data 419 is reduced by reducing the ratio band, thereby passing through a component that is not necessarily designed as a transmission line, such as a conductive part of the hinge 429. Even transmission is possible. In addition, a signal having a low frequency such as the horizontal synchronization signal 420 can be easily transmitted through a wired transmission path 428 wired through the hinge 429.

  The output signal of the modulation circuit 408 transmitted through the hinge 429 is amplified by the preamplifier 412, and then an unnecessary band component is removed by the band pass filter 413 and input to the demodulation circuit 414. The bandpass filter 413 removes interference when a high-power transmission function is built in, for example, a mobile phone, or removes circuit noise when the output power of the modulation circuit 408 on the transmission side is reduced to the limit. Used to do. Further, the horizontal synchronization signal 420 transmitted through the wired transmission path 428 is output to the PLL 415 and the synchronization circuit 416.

  Then, the frequency of the horizontal synchronizing signal 420 is multiplied by the PLL 415 to restore the carrier frequency and supply it to the demodulation circuit 414. Then, the demodulation circuit 414 mixes the output from the PLL 415 with the output from the band pass filter 413, thereby demodulating the received signal. Here, by supplying the horizontal synchronization signal 420 to the PLL 415 via the wired transmission line 428, the frequency of exactly the same frequency and phase as the carrier wave used in the modulation circuit 408 on the transmission side can be restored on the reception side, and synchronous detection is performed. Is extremely easy. The synchronization circuit 416 detects the boundary of the received signal packet by the horizontal synchronization signal 420 and performs packet synchronization. The serial-parallel conversion circuit 417 extracts the display data 422 portion from the demodulated reception packet, performs serial-parallel conversion for each pixel, and generates display data 422.

  The logic circuit 418 generates a horizontal synchronization signal 423, a vertical synchronization signal 424, and a transfer clock 425 for the X driver from the demodulated packet in accordance with the timing of the display data 422 in the packet. Are output to the driver of the liquid crystal display as signals corresponding to the horizontal synchronizing signal 1314, the vertical synchronizing signal 1318, and the X clock signal 1315.

  Note that the frequency of the signal generated by the PLL 409 does not interfere with the original purpose of an electronic device that uses radio waves, such as a radio receiver or a mobile phone, and does not interfere with the signal, and easily passes through the hinge 428. Select the frequency. This frequency may vary depending on the positional relationship between the first and second housing parts. In such a case, the carrier frequency is dynamically changed while the communication quality status is fed back from the receiving side. That is, it is possible to change the carrier frequency by changing the multiplication ratio of the PLLs 409 and 415 while evaluating the reception quality by the evaluation circuit 405 on the receiving side and feeding back the evaluation result to the PLLs 409 and 415. Communication quality can be evaluated by measuring received power and error rate.

In this case, the wired transmission path 428 that communicates between the two housings requires two lines, a transmission line that sends the horizontal synchronization signal 420 and a transmission line that sends feedback information to the PLL 409. Transmission is easy. Also, these pieces of information can be transmitted and received on one transmission line by a method such as time division multiplexing.
In an electronic device such as a cellular phone that receives a weak signal at a remote place, the frequency of the signal generated by the PLL 409 directly affects the reception sensitivity, and therefore the selection of the frequency is important. If a frequency that is 2 GHz or higher and does not affect the receiver is selected, the occupied band is about 200 MHz even if data of 100 Mbps is transmitted, and the specific band is 1/10 or less. For this reason, it is easy to flatten the frequency characteristics in the band as compared with the conventional transmission line that requires a band extending over octaves of 200 MHz or more from DC. As will be described later, in the hinge 429 large enough to be used in a mobile phone, there are several frequencies having flat transmission characteristics in a frequency band of about 200 MHz in a frequency band of several GHz. In these frequency bands, it is easy to design a matching circuit that terminates the power supply / reception point, and it is possible to ensure good performance communication (in FIG. 4, the matching circuit is omitted, but the hinge 429 is used as a transmission line). It is necessary to explain that a matching circuit may be inserted at both ends of the hinge 429 in order to suppress reflection at both ends, minimize waveform distortion, and improve transmission energy efficiency. Will not.) Furthermore, since the frequency used for data transmission is high, the components constituting these can be easily miniaturized and the mounting space can be saved. In addition, the efficiency of signal energy can be increased by good matching. This is effective in saving power consumption.

  In general, in wireless communication, the modulation circuit 408 on the transmission side and the demodulation circuit 414 on the reception side need to have the same carrier frequency, and high accuracy is required for the frequency of the carrier oscillation circuit between transmission and reception. The error between the two appears as direct communication quality degradation. However, according to the configuration of FIG. 4, the modulation circuit 408 and the demodulation circuit 414 are based on the same reference signal, that is, the horizontal synchronization signal 420 synchronized with the clock pulse generated by the same oscillation circuit 426. Since carrier waves are obtained by multiplication using PLLs 409 and 415 having the same characteristics, an error in the carrier frequency between transmission and reception does not occur. For this reason, the accuracy of the oscillation circuit 426 is not a problem, and there is a cost reduction effect.

  Note that the PLL 415 is not essential, and the output of the PLL 409 may be sent directly to the demodulation circuit 414. However, since it is difficult to send a high-frequency signal such as a carrier wave by wire, it is not very reasonable. It is more feasible to transmit a low frequency reference signal such as the horizontal synchronization signal 420 as in the configuration of FIG. 4 and multiply the signal by the PLL 415 to restore the same carrier wave as the output of the PLL 409 on the receiving side.

  Further, by providing the preamplifier 412 in front of the demodulating circuit 414, even a very weak signal can be received. The preamplifier 412 can also have an equalizer function or the like that corrects characteristics when the hinge 429 is used as a transmission path. This makes it possible to maintain communication quality with much less radiated power than unnecessary radiated power generated from the wired transmission path 429, compared to the conventional transmission method in which the received signal level must be kept at a predetermined value. This is a fundamental EMI countermeasure. In addition, the power consumption can be reduced as compared with the conventional transmission method in which the storage capacity of the wired transmission path 429 must be driven at the logic level.

  In this way, by using the hinge 429 as a transmission path, it becomes possible to transmit a large amount of display data to the display body at a high speed, and in comparison with the conventional technique that requires a large number of wired transmission paths in parallel. The number can be greatly reduced, and the structure of the apparatus can be simplified. It is also easy to take measures against external noise, interference, and external interference. Furthermore, it is possible to remove various problems caused by wired transmission such as an increase in power consumption, restrictions on wiring positions, anti-noise, EMI problems, reliability degradation, and the like that have become more apparent with an increase in the size of the display body.

FIG. 5 is a block diagram showing a main part of an embodiment of another electronic device according to the present invention, and at the same time, a part corresponding to the modulation circuit 408 and the demodulation circuit 414 of the embodiment 1 in more detail. is there. The transmission is separated from the transmission side and the reception side with a hinge 507 in the center of the drawing as a boundary, and each case is housed in a separate case, and these cases are connected via a hinge 507.
In FIG. 5, an oscillation circuit 502 that generates a carrier wave is provided on the transmission side, and the oscillation circuit 502 generates a rectangular pulse train having a carrier frequency. The oscillation circuit 502 corresponds to the PLL 409 of the third embodiment. The multiplication circuit 501 multiplies the carrier wave generated from the oscillation circuit 502 and the transmission data 503, thereby converting the signal band of the transmission data into a frequency band centered on the carrier wave. This is a modulation operation. Then, the multiplication result of the multiplication circuit 501 is sent to the reception side via the hinge 507.

  In the third embodiment, the synchronization signal is generated by dividing the pulse train generated by the oscillation circuit 426 by the liquid crystal controller 403, and the carrier wave is generated by multiplying the synchronization signal by the PLL 409. Even if the configuration as in Example 4 is adopted, the carrier wave generated by the oscillation circuit 502 and the synchronization signal generated by the frequency divider circuit 504 are synchronized, and the same operation as in Example 3 can be performed.

  The multiplication circuit 501 can be configured by an exclusive OR circuit because both the transmission data 503 and the output of the oscillation circuit 502 are digital signals. That is, if the analog value of the value “1” is associated with the logical value “0” and the analog value of the value “−1” is associated with the logical value “1”, the input / output of the exclusive OR circuit is just a multiplication circuit. Works. In addition, when the output level when the multiplication circuit 501 is configured by a digital circuit is too high, it can be connected to the hinge 507 through the attenuation circuit 511 as appropriate. Since communication can be suppressed to the minimum power that can be received on the receiving side, harmonic interference to other equipment circuits, etc. is low, and it is modulated with a filter, etc., as in the case of phase modulation used in wireless communication. In many cases, processing for removing harmonic components from the circuit output is unnecessary.

  On the other hand, on the receiving side, the PLL 508 generates a carrier wave by multiplying the output of the frequency dividing circuit 504 transmitted through the wired transmission path 510 to the frequency dividing ratio times of the frequency dividing circuit 504 as a reference. The received data signal received through the hinge 507 passes through a preamplifier and the like, and is then input to the multiplication circuit 505. After being multiplied by the carrier wave reproduced by the PLL 508, the high-frequency component is removed by the low-pass filter 506, and the demodulated signal 509 is obtained. Is demodulated as The low-pass filter 506 removes the high frequency component of the output of the multiplier circuit 505 (a thin pulse component generated by a slight phase shift difference between the received data signal separated by the multiplier circuit 505 and the reproduction clock waveform of the PLL 508), and demodulates the demodulated signal. 509 is output.

  6A to 6C show time charts of the modulation circuit 408 of FIG. 4 described above. 5A shows a carrier wave (clock) generated by the oscillation circuit 502 of FIG. 5, FIG. 5B shows transmission data 503, and FIG. 5C shows an output transmission signal. If the time chart of FIG. 6 is viewed as a digital circuit, the modulation circuit 408 is an exclusive OR circuit, and if viewed as an analog value that takes a value of “± 1”, the modulation circuit 408 is a multiplication circuit.

  6D to 6F are time charts of the demodulation circuit 414 according to the first embodiment. 5D is a received signal, FIG. 5E is a carrier pulse train reproduced by the PLL 508 in FIG. 5, FIG. 5F is an output of the multiplier circuit 505 in FIG. 5, and the low-pass filter 506 is obtained from this signal. A high frequency component generated by a slight phase difference between the received signal and the output of the PLL 508 is removed, and the demodulated signal 509 is restored. In FIG. 4D, the received signal is illustrated as a logic level pulse train. However, even when sufficient amplitude cannot be ensured in this way, the multiplication circuit 505 is not an exclusive OR circuit but an analog multiplication. By using a circuit, the same operation can be performed.

  As is clear from the figure, if the carrier wave (clock) (FIG. 6A) and the recovered carrier wave (reproduced clock) (FIG. 6E) are different in frequency or out of phase, demodulation is successful. Does not work. In conventional communication, a high-accuracy oscillation circuit is separately provided on the transmission side and the reception side to minimize errors. According to this configuration of the present embodiment, since the reproduction clock on the reception side is based on the output of the oscillation circuit 502 on the transmission side, a reproduction clock having the same frequency as that on the transmission side can always be secured on the reception side. No error due to stability or frequency accuracy. Even with an inexpensive oscillation circuit 502, a circuit with extremely high stability can be constructed.

  In the present embodiment of the present invention, a sufficiently high signal-to-noise ratio can be ensured, so that the signal can be amplified to a level that can be regarded as a digital value (in FIG. 5, the amplifier circuit is omitted). ). In this case, the amplified signal level increases to the logical value level, but the load driven by the logical value is not a long distance with a large stray capacitance such as a transmission path from the CPU to the display body, but the same semiconductor. Since the load is extremely short as in a chip, the power consumption does not increase. Even if the received signal is an analog level that is not amplified to a logical value level, the output of the PLL 508 is a rectangle (which takes a value of “± 1”), so that multiplication can be realized with a simple switch circuit. That is, a double-balanced multiplier circuit and an inverting amplifier circuit and a normal amplifier circuit having the same absolute value of amplification and opposite polarities are prepared. When the output level of the PLL 508 is “1”, the inverting amplifier circuit This can be realized by selecting the output by a switch and selecting the output of the normal amplifier circuit when the output level of the PLL 508 is “0”. A circuit having such a structure may be used as the multiplication circuit 505.

  According to the above configuration, the modulation circuit 408 in FIG. 4 can be realized very simply by using an exclusive OR circuit, and the demodulation circuit 414 by using one exclusive OR circuit or an analog multiplication circuit and a low-pass filter. As described above, in this embodiment, an example of binary phase modulation (BPSK) of a binary carrier wave with a digital signal has been described. However, for example, QPSK, amplitude modulation, or frequency modulation that uses a multi-phase carrier wave is used as an example of modulation / demodulation. Is possible.

  FIG. 7 is a block diagram showing a main part of another embodiment of the electronic apparatus according to the present invention, and shows an example applied to an electronic apparatus using an image sensor. In the electronic device, circuits are separated by a one-dot chain line 711 in the figure, and are housed in two housings. The electronic device is provided with a hinge 713 that is connected so that the positional relationship between these two cases can be changed, and these cases are connected via the hinge 713. In addition, a modulation circuit 705 is provided in one housing portion, and a demodulation circuit 712 is provided in the other housing portion, and an output from the modulation circuit 705 is transmitted to the demodulation circuit 712 via a hinge 713. Can do.

  In FIG. 7, the image sensor 701 is driven by a horizontal synchronization signal 720 and a vertical synchronization signal 721 generated from the control circuit 702, and outputs captured image data 719 to the logic circuit 703. The logic circuit 703 receives the image data 719 output from the image sensor 701 and the horizontal synchronization signal 720 generated from the control circuit 702 to construct a transmission packet. The packet is input to the modulation circuit 705, modulates the carrier wave generated by the oscillation circuit 706, is fed to the hinge 713, and is sent to the reception side via the hinge 713.

  When the signal fed to the hinge 713 is received at the power receiving end, the signal is amplified by the preamplifier 709, an unnecessary out-of-band signal is removed by the band pass filter 710, and then input to the demodulation circuit 712. The PLL 715 multiplies the horizontal synchronization signal 720 transmitted through the wired transmission path 707 to the carrier frequency to generate a carrier wave, and inputs the carrier wave to the demodulation circuit 712. The demodulation circuit 712 also extracts a transmission packet from the horizontal synchronization signal 720 using the synchronization timing necessary for demodulation. The serial-parallel conversion circuit 714 extracts an image data portion from the demodulated reception packet, performs serial-parallel conversion for each pixel, and generates pixel data.

The logic circuit 716 generates a memory address for writing to the video memory 717 in accordance with the demodulated pixel data, and writes the image data to the address of the video memory 717 directly or via the CPU 718. The CPU 718 accesses the video memory 717 and uses the image data for various applications.
Normally, the CPU 718 performs control such as activation of the image sensor 701. However, it is also possible to transmit information related to this activation from the CPU 718 side to the control circuit 702 of the image sensor 701 as a synchronization signal. A more detailed method will be described later in Example 6.

  As described above, by using the hinge 713 as a transmission path, a large amount of image data 719 can be transmitted, and the number of wirings can be greatly reduced as compared with the conventional technique that requires a large number of parallel transmission paths. The device structure can be simplified. Various problems caused by wired transmission such as an increase in power consumption, restrictions on wiring positions, EMI problems, reliability degradation, and the like, which have become more apparent with the increase in size of the image sensor 701 can be eliminated. On the receiving side, since the synchronization timing necessary for demodulation is sent through the wired transmission line 707, there is no need to acquire synchronization, and the circuit can be greatly simplified. In addition, since the carrier wave generated by the same oscillation source between transmission and reception is used as a reference, the frequency accuracy required for the oscillation circuit 706 is remarkably relaxed, which has a great effect on cost reduction and feasibility.

  FIG. 8 is a block diagram showing a main part of still another embodiment of the present invention. Note that this embodiment is a case where the image sensor 701 is also provided near the liquid crystal display body 801, and takes the form of combining the configurations of the third and fifth embodiments back to back. That is, the blocks of FIGS. 4 and 7 are arranged so that the CPU 401 of FIG. 4 and the CPU 718 of FIG. 7 are shared. The electronic device is separated into two parts indicated by a one-dot chain line 802 in the drawing, separated and housed in two housings, which are connected by a hinge 806. The constituent elements having the same numbers as those used in the description in FIGS. 4 and 7 are the same as those described in the third and fifth embodiments, and will not be described.

  In FIG. 8, the modulation circuit 408 modulates the display data signal 419 stored in the video memory 402, converts the display data signal 419 into a signal having a high frequency but low ratio band, and sends the signal to the hinge 806. Note that a switch 804 between the modulation circuit 408 and the hinge 806 is a switch circuit that switches a transmission direction of a signal to be sent, that is, a display data signal 419 displayed on the liquid crystal display body 801 and an imaging data 719 imaged by the imaging element 701. . The display data signal 419 transmitted through the hinge 806 is subjected to signal processing such as amplification by the preamplifier 412 and the like, demodulated by the demodulation circuit 414, and output to the liquid crystal display 801.

  The image sensor 701 is disposed near the liquid crystal display 801, and image data 719 obtained by the image sensor 701 is composed of a communication packet by the logic circuit 703, modulated by the modulation circuit 705, and sent to the switch 803. The switches 803 and 804 are switched between the case where the data to be transmitted is the image data 719 and the case where the data is the display data 419. That is, when the data to be transmitted is the display data 419, the switch 804 is switched to the modulation circuit 408 side and the switch 803 is switched to the preamplifier 412 side. On the other hand, when the data to be transmitted is the imaging data 719, the switch 804 is switched to the preamplifier 709 side and the switch 803 is switched to the modulation circuit 705 side.

  When display and imaging are performed at the same time, for example, the operation can be performed by repeating switching in such a short time as to be substantially simultaneous, such as every frame or every horizontal scanning line. Further, the horizontal synchronization signal 420 can be shared for display and imaging, and is transmitted to the other side through the wired transmission path 805. That is, based on the horizontal synchronization signal 420 generated by the liquid crystal controller 403, the horizontal synchronization signal 720 for the image sensor can be generated by the synchronization circuit 416 and the logic circuit 418. In this case, the horizontal synchronization signal 420 is sent from the liquid crystal controller 403 side to the synchronization circuit 416, but the imaging data 719 is sent from the modulation circuit 705 to the switch 804 side in the opposite direction to the horizontal synchronization signal 420. . The logic circuit 418 also generates a synchronizing signal for display (horizontal synchronizing signal 423 and vertical synchronizing signal 424) for correctly sending a signal to the driving circuit of the liquid crystal display body 801.

The imaging data 719 transmitted by the hinge 806 is demodulated by the demodulation circuit 712 and stored in the video memory 402. The CPU 401 performs control such as writing to a predetermined address of the video memory 402 in order to display the imaging data 719 on the liquid crystal display 801.
Comparing the configurations of FIG. 4 and FIG. 7, in FIG. 4, the modulation circuit 408 obtains the carrier wave from the PLL 409. On the other hand, in FIG. 7, the modulation circuit 705 obtains the carrier wave from the PLL 415. On the other hand, on the receiving side in FIG. 7, the demodulation circuit 712 obtains the carrier wave from the PLL 409, and the positions of the PLL 409 and the oscillation circuit 426 are reversed between transmission and reception when transmitting display data and when transmitting imaging data. It has become. Since the PLL 415 is already synchronized with the oscillation circuit 426 by the display transmission / reception system, such a configuration is possible.

  In other words, in one-way communication, there is only a method to synchronize with the signal transmitted on the receiving side. However, if the transmission / reception is bidirectional, synchronization is performed on the transmitting side according to the timing on the receiving side as in this embodiment. The transmission side of the imaging data 719 generates a packet by matching the timing with the horizontal synchronization signal 420 sent from the reception side of the imaging data 719, and transmits the packet by matching the phase of the carrier wave. As described above, when the PLL 415 is already synchronized with the oscillation circuit 426 by the display transmission / reception system, synchronization can be established on the transmission side of the imaging data 719, and therefore a circuit for synchronization is provided on the reception side of the imaging data 719. Can be omitted.

  As described above, bidirectional communication is performed between the casings connected via the hinge 806 to send data to the liquid crystal display body 801, and the image sensor 701 disposed near the liquid crystal display body 801. It is possible to transmit and receive signals from the circuit, and the circuit can share a common part and can be simplified. By adopting the above configuration, a large amount of display data and imaging data can be transmitted by using the hinge 806 as a transmission path, and the number of wires is greatly increased as compared with the conventional technique that requires a large number of parallel transmission paths. The device structure can be simplified. Various problems caused by wired transmission such as an increase in power consumption, restriction of wiring position, EMI problem, reliability deterioration, and the like, which have become more apparent with the enlargement of the liquid crystal display body 801 and the image sensor 701 can be eliminated. On the receiving side, since a synchronization timing signal necessary for demodulation is sent through the wired transmission line 805, there is no need to acquire synchronization, and the circuit can be greatly simplified. In addition, since the carrier wave generated by the same oscillation source between transmission and reception is used as a reference, the frequency accuracy required for the oscillation circuit 426 is remarkably relieved, which has a great effect on cost reduction and feasibility.

FIG. 9 shows a main part of another embodiment according to the present invention, in particular, a hinge part that mechanically connects two casings and is electrically connected as a large-capacity transmission line between the two casings. The case where it did is illustrated.
FIG. 4A is an overall view of circuit boards 901 and 902 and a hinge 904 on which circuit elements separated and incorporated in two cases are mounted, and FIG. 4B is an enlarged view for showing the hinge portion in more detail. It is. Note that an antenna 903 used for transmission / reception of a mobile phone is connected to the circuit board 901. The hinge 904 is mechanically fixed with screws, rivets or the like in order to mechanically connect the two circuit boards 901 and 902. On both circuit boards 901 and 902, a wiring pattern is formed by metal thin films 910a and 910b provided on the dielectrics 909a and 909b, respectively, and an electronic component is connected through the wiring pattern to constitute an electronic circuit. can do. In the figure, a fine wiring pattern by the metal thin films 910a and 910b is omitted, and a conductor (ground) having a ground potential is shown as a representative pattern. In addition, on the dielectrics 909a and 909b, a power receiving point 907 and a power feeding point 908 are formed by metal thin films 910a and 910b, respectively, and the power receiving point 907 and the power feeding point 908 are connected to each other through a hinge 904. Has been.

  The hinge 904 can be rotated around the central axis 911-912 and the central axis 913-914 in order to change the positional relationship between the two circuit boards 901, 902, and can be bent or twisted as the positional relationship. This is shown in FIG. The hinge 904 is made of a hard metal and has conductivity in order to obtain sufficient strength for such mobility. And in order to fix the electric potential of both the circuit boards 901 and 902, as shown by circles 905 and 906, they are also electrically connected (in a direct current). In this manner, the modulation signal is supplied between the feeding point 908 and the nearest ground potential through the hinge 904 that is electrically short-circuited to the ground, and the signal is received at the receiving point 907.

When the S-parameters are obtained with the power supply to the cellular phone antenna 903 as port 1, the power reception point 907 as port 2, and the power supply point 908 as port 3, the results are as shown in FIGS. Such a characteristic can be obtained by numerical calculation such as FDTD (Finite Difference Time Domain) method.
FIG. 10 shows the reflection coefficient at S33, that is, the feeding point 908. When power is fed to this feeding point 908, 50% or more of energy is radiated into the air through the feeding point 908 at a frequency of about 2 GHz or higher. As can be seen from FIG. Note that, due to the symmetry of the S parameter, similar characteristics can be obtained even if the direction of power supply and reception is reversed.

  FIG. 11 shows the ratio of energy transmitted from S23, that is, from port 3 to port 2. In a frequency range of 2 GHz to 4 GHz, S23 is −20 dB or more, and is an amount that exceeds the path loss (about −30 dB) at a distance of 3 cm at 3 GHz. That is, it can be seen that by using the hinge 904 as a transmission medium, data transmission between the housings can be performed with less loss than the case where the transmission data is modulated to sufficiently propagate the space with an antenna having sufficient matching.

From the above, even if the hinge 904 connected to the ground potential in a direct current is used, if the signal to be transmitted is modulated and converted into an appropriate frequency band, the signal transmission using the hinge 904 is possible. Recognize. In this embodiment, a signal to be transmitted is modulated using this characteristic, and a large amount of data is transferred using the hinge 904, thereby reducing the complexity of wiring.
FIG. 12 shows the strength of interference from the cellular phone antenna 903 to the power receiving point 907 in S21. In the figure, there are places where the transmission characteristics are lowered near 1.4 GHz and 2.1 GHz, but by changing the shape of the hinge, this frequency is set to around 2 GHz used for transmission of a third-generation mobile phone, for example. It is possible to bring it. In this way, interference from the mobile phone function, which is the original function of the device, to internal communication can be reduced. Conversely, it can be seen from the characteristic of S23 that interference with the original cellular phone function from the frequency band (for example, 3 to 4 GHz) selected for internal communication between the cases is reduced.

  In order to decrease the reflection coefficient of S22 and S33 and increase the transmitted energy, the position of power supply / reception points 907 and 908, that is, the dimension indicated by 916 in FIG. 9B for port 2 and the dimension indicated by 917 for port 3 It is possible to adjust the matching state at the power supply / reception points 907 and 908, and the circuit boards 901 and 902 are designed so that power is received and supplied at such positions. The optimum power supply / reception points 907 and 908 also vary depending on the carrier frequency used. Since the transmission / reception is within the same electronic device and the synchronization signal is transmitted through the priority transmission path, the carrier frequency information can be shared between transmission and reception, so that the carrier frequency can be freely changed. Therefore, when the positions of the power supply / reception points 907 and 908 are limited, it is possible to adjust the positions of the power supply / reception points 907 and 908 by changing the carrier frequency.

  The S parameter also changes depending on the positional relationship between the two cases such as bending and twisting by the action of the hinge 904. (FIGS. 10 to 12 only illustrate typical positional relationships.) Since the positions of the power supply / reception points 907 and 908 cannot be changed once the circuit boards 901 and 902 are fixed, Although the S parameter cannot be readjusted depending on the positions of the electrical points 907 and 908, it is possible to change the carrier frequency to obtain optimum transmission characteristics. If the carrier frequency is dynamically selected and set by the method described in the third embodiment, it is possible to always ensure good transmission characteristics even if the positional relationship between the two housings changes.

  As described above, according to the present embodiment, high-speed data transmission, which has been difficult in the past, can be transmitted using the hinge 904 that is connected to the ground potential in a DC manner. Various problems such as complicated wiring, EMI, power consumption, mounting space and reliability, restrictions on device design, and reliability of communication data can be solved. Moreover, any circuit for realizing this can be integrated as a CMOS integrated circuit on a semiconductor integrated circuit, and compared with a conventional method using a mounting component such as a connector for connecting a number of transmission lines on a flexible substrate. However, the cost can be significantly reduced and it is extremely useful.

  In this embodiment, the data stream to be transmitted is modulated and raised to a higher frequency band to lower the specific band and to obtain good communication characteristics using a flat characteristic band. is there. Since the transmission frequency is high, it is easy to miniaturize the parts used. In addition, since there is a single transmission line, measures such as shielding are easy and reduction of external interference is easy. In addition, even in an environment where a transmitter that transmits extremely strong radio waves is built in the same housing as a mobile phone, it is easy to take measures against them.

  In the above-described embodiment, the mobile phone has been described as an example. However, the circuit of the apparatus is separately housed in two or more housings, and is connected and integrated by a hinge so that the positional relationship thereof can be changed. The present invention can also be applied to electronic devices such as video cameras, PDAs (Personal Digital Assistance), and notebook personal computers.

The perspective view which shows a state when the clamshell type mobile phone based on this invention is opened. The perspective view which shows the state when the clamshell type mobile phone based on this invention is closed. The perspective view which shows the external appearance of the rotary type mobile phone based on this invention. The block diagram which shows the principal part of one Example of the electronic device of this invention. The block diagram which shows the principal part of other one Example of the electronic device of this invention. The time chart explaining operation | movement of other one Example of the electronic device of this invention. The block diagram which shows the principal part of other one Example of the electronic device of this invention. The block diagram which shows the principal part of other one Example of the electronic device of this invention. The block diagram which shows the principal part of the mechanism of one Example of the electronic device of this invention. The characteristic view which shows the characteristic of the Example concerning this invention. The characteristic view which shows the characteristic of the Example concerning this invention. The characteristic view which shows the characteristic of the Example concerning this invention. FIG. 10 is a block diagram illustrating an electronic device having a conventional liquid crystal display body. FIG. 6 is a time chart for explaining the operation of an electronic device having a conventional liquid crystal display.

Explanation of symbols

1, 21 1st housing part, 2, 22 2nd housing part 3, 23, 429, 507, 713, 806, 904 Hinge, 4, 24 Operation button 5, 25 Microphone, 6, 26 External wireless communication Antenna, 7, 10, 27, 30 modulation / demodulation circuit, 8, 11, 28 display, 9, 29 speaker, 12 image sensor, 408, 705 modulation circuit, 414, 712 demodulation circuit, 428, 510, 707, 805 wired Transmission path, 402, 717 Video memory, 403 Liquid crystal controller, 801 Liquid crystal display, 701 Image sensor, 426, 502, 706 Oscillator circuit, 504 Frequency divider circuit, 409, 415, 508, 715 PLL, 501, 505 Multiplier circuit

Claims (2)

A first housing part;
A second housing part;
A connecting portion that connects the first housing portion and the second housing portion so as to change a positional relationship between the first housing portion and the second housing portion;
A first circuit portion mounted on the first housing portion;
A second circuit portion mounted on the second housing portion;
A first internal communication control unit mounted on the first housing unit;
A second internal communication control unit mounted on the second housing unit,
The first and second internal communication control units control communication performed between the first and second circuit units,
Said first or second internal communication control unit, have rows communication via the receiving conductor means for receiving electricity to the connecting portion at least part of the information,
The first or second internal communication control unit is
Generating means for generating data as a serial signal;
An oscillation means for generating a carrier wave;
Modulation means for modulating the carrier wave by the signal of the generation means;
A power feeding means for feeding a signal generated by the modulation means to the connecting portion;
A demodulator for receiving and demodulating a signal generated by the modulator connected to the coupling unit;
The electronic device oscillates a frequency having an optimum transmission characteristic when signal transmission is performed in a positional relationship between the first housing portion and the second housing portion . The receiving electric unit according to claim 1 Symbol mounting, characterized in that it is set to such a proper transmission characteristic position when the position of the receiving electric point makes a signal transmission at the position of the receiving electric point Electronic devices.

Images