JP3755530B2 - Electronic equipment - Google Patents

Description

  The present invention relates to an electronic apparatus having an element that requires high-speed data transfer, such as a display element or an imaging element.

  In recent years, improvements in functions of cellular phones, notebook computers, digital cameras, and the like have become increasingly complex, requiring high resolution and high definition of built-in display elements and imaging elements. In particular, in mobile phones, folding functions called clamshell type have become mainstream because of the demand for smaller and lighter weight and lower power consumption as well as higher functions such as built-in camera functions and larger displays. .

  Due to such demands, there are often a plurality of mounting boards, and in that case, a display element, an imaging element, and a CPU for controlling the data are often mounted on separate boards. Inevitably, the connection between the CPU and the display element or imaging element becomes long. As the resolution of elements increases, the signal frequency of those lines increases, making connection difficult. In particular, the clamshell structure has a structure in which both are connected via a thin hinge portion. As the resolution of display devices and image sensors increases, the amount of data exchanged between both substrates increases, and high-speed transfer technology is required. In order to solve this problem, for example, (LVDS: Low Voltage Differential Signaling) has been proposed as a high-speed data transmission method for connecting a display body and an image sensor (Patent Document 1 and Patent Document 2). In Patent Document 3 and Patent Document 4, etc., a new method has been 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 Further, the progress of semiconductor manufacturing technology is remarkable, and as a system-on-chip, the degree of integration is increasing, and there is a tendency to mount all semiconductor circuits that fall within one chip. Therefore, it is not uncommon for the number of pins for connection between the semiconductor chip and the external circuit to become enormous and to exceed several hundreds. Also, the operating frequency of the semiconductor circuit is increased, and the conventional method of connecting to the outside via wire bonding has a problem with high frequency characteristics, and it is difficult to correctly exchange signals with the outside. In order to solve such a problem, Non-Patent Document 1 reports research on wireless connection between chips.

161 page of the Nikkei Microdevice December 2003 issue

  However, recent increases in the size of display bodies cannot provide sufficient performance even with these technologies. In order to obtain sufficient anti-noise characteristics (interference immunity, interference), careful design and adjustment are required. In LVDS, since the signal level is small, an analog signal is inevitably handled by a digital IC, resulting in a problem that power consumption increases.

  In addition, in order to transmit signals accurately, matched impedance termination is required. However, since the number of lines that need impedance termination is large and the transmission impedance is about 100 ohms at most, the termination resistance is consumed. There was also a problem that the power would become unacceptably large.

  Furthermore, when the wiring passes through a movable part such as a hinge part, the characteristic impedance changes depending on the degree of bending, so that impedance mismatch occurs depending on the situation, and signal degradation is caused by reflection at the bent part. 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 components are restricted.

  Further, as a matter of course, the number of signals exchanged through the hinge portion is several tens, and the wiring on the substrate cannot be used. Therefore, the flexible substrate is connected through the connector. Connections using flexible substrates and connectors have the disadvantages of high cost and low connection reliability.

  Furthermore, the increase in the number of wirings accompanying the increase in the transfer data requires a physical space for wiring, which naturally imposes great restrictions on the device design.

  Further, when a large amount of data is routed by such a long wiring at a high speed, the radiated electromagnetic field from the line increases, which causes electromagnetic interference to other electronic devices or to itself. In the conventional signal transmission using the signal line, the amplitude level at the power receiving end is defined, and even if sufficient quality is ensured at the power receiving end, the signal amplitude level cannot be lowered. That is, EMI countermeasures become difficult, resulting in restrictions on device design and cost increase. Further, since driving on the transmission side simultaneously drives the stray capacitance of the line in addition to the load at the power receiving end, extra energy is required for signal transmission. That is, the result is an increase in power consumption.

  These problems can be solved at once by introducing the conventional wireless communication technology in the same electronic device and wirelessly transferring the data transfer of the portion where wiring is difficult by the electromagnetic wave signal.

  However, in order to introduce the conventional wireless communication technology to data transfer in an electronic device, the mechanism is very complicated and difficult to implement compared to the case where transmission is performed by a conductive wire.

  Therefore, the present invention improves the conventional wireless communication technology and enables it to be applied to data transmission within the same electronic device, and makes the method of high-speed transmission of data having the above-mentioned various problems and restrictions wireless. An object of the present invention is to realize a low-cost and highly reliable electronic device by eliminating the disadvantages and limitations of the conventional data transmission method.

The electronic device of the present invention supplies information to an information transmitting unit that modulates first category information and transmits it as an electromagnetic wave signal, an information receiving unit that receives and demodulates the electromagnetic wave signal, and supplies power to the information transmitting unit and the information receiving unit. A common power line, and a wired communication unit that communicates by superimposing the second category information on the power line between the information transmitting unit and the information receiving unit, and at least wireless of the first category information While the communication is performed, the connection of the wired communication unit is maintained and the wired communication of the second category information is performed.

  According to the above configuration, transmission of a signal group that is difficult to transmit at high speed is transmitted wirelessly, various problems associated with high-speed transmission data are avoided, and signals such as synchronization information necessary for wireless transmission are superimposed on the power supply line. By transmitting by wire, it is possible to avoid the complexity of the system due to the wireless connection, and also to reduce the difficulty associated with wiring because the wired path is also shared with the power supply line.

  This makes it possible to transmit high-speed data transmission signals through space without complicating the system, and wiring for that is unnecessary, simplifying wiring such as flexible boards and connectors, resulting in high costs and reliability. The problem of sex disappears. In addition, it is possible to avoid the problem of power consumption that increases with the termination for impedance matching and the increase in data transmission speed. In addition, it is possible to alleviate restrictions on wiring routing and component placement, and improve the design and usability of the electronic device. Furthermore, since the electromagnetic waves used for signal transmission are performed within a short distance in the same system, it is only necessary to ensure communication within this distance, and the intensity of the radiated electromagnetic waves can be lowered to the limit. Essentially improved and countermeasures become easier. In addition, since the wired path is shared with the power supply line, the difficulty associated with wiring can be reduced.

The second category information of the electronic apparatus of the present invention is characterized in that it is a synchronization information about the wireless communication of the information receiving unit and the information transmission unit.

  According to the above configuration, the procedure for acquiring synchronization and the circuit on the receiving side can be omitted at the time of wireless transmission, and the circuit for wireless transmission can be simplified.

The second category information of the electronic apparatus of the present invention is characterized in that the carrier information of the information transmission unit.

  According to the above configuration, the carrier waves on the transmitting side and the receiving side can always be tracked during radio transmission, so that the accuracy of the carrier wave oscillator can be remarkably reduced, and the accuracy of the hardware for transmission and reception for transmitting and receiving the first category information can be improved. It can be remarkably eased and has great cost merit.

The information transmission unit of the electronic device of the present invention includes a control unit that generates a reference signal and a modulation unit that converts the first category information into an electromagnetic wave signal in synchronization with the reference signal, and is transmitted and received by the wired communication unit. that the second category information is the reference signal, the information receiving unit that comprises a demodulator for demodulating the first category information in synchronization with the reference signal received via the wired communication unit Features.

  According to the above configuration, since the wireless transmission unit and the wireless reception unit can operate in synchronization with the same reference signal, no synchronization circuit is required on the reception side, and transmission / reception for transmitting / receiving the first category information is performed. The hardware configuration for can be greatly simplified.

The information transmission unit of the electronic apparatus of the present invention modulates a carrier wave emanating from the first carrier oscillation unit for oscillating a carrier wave synchronized with the reference signal and the control unit for oscillating a reference signal having the carrier wave oscillation unit in the first category information and comprising a modulator for converting an electromagnetic wave signal, the second category information transmitted and received through the wired communication unit is the reference signal, wherein the information receiver is received via the wired communication unit characterized in that it comprises a demodulator for demodulating the first category information with the carrier that emits a second carrier oscillation unit for oscillating a carrier wave synchronized with the reference signal of said second carrier wave oscillation unit.

  According to the above configuration, since the wireless transmission unit and the wireless reception unit can operate with a carrier wave generated in synchronization with the same reference signal, a circuit for carrier wave recovery on the reception side is not necessary, and the first category information The hardware configuration for transmission / reception for transmitting / receiving data can be greatly simplified.

The information transmission unit of the electronic apparatus of the present invention the carrier for emitting a first carrier oscillation unit for oscillating a carrier wave synchronized with the reference signal and the control unit for oscillating a reference signal having the carrier wave oscillation unit in the first category information A modulation unit that modulates and converts to an electromagnetic wave signal in synchronization with a reference signal, wherein the second category information transmitted and received via the wired communication unit is the reference signal, and the information receiving unit is the wired communication unit the received the first category information with the carrier and the second carrier oscillator section emitted by the second carrier wave oscillation unit for oscillating a carrier wave synchronized with the received the reference signal through the wired communication unit through A demodulator that demodulates in synchronization with the reference signal is provided.

  According to the above configuration, the wireless transmission unit and the wireless reception unit can be synchronized with one reference signal superimposed on the power line, and operate with a tracked carrier wave generated in synchronization with the reference signal. Therefore, a circuit for synchronization on the reception side and a circuit for carrier wave recovery are not required, and the hardware configuration for transmission / reception for transmitting / receiving the first category information can be remarkably simplified.

The information transmission unit of the electronic apparatus of the present invention modulates the first category information by phase modulation, the carrier wave information modulation and demodulation is generated from the reference signal wire transmission as the second category information, and / or the information transmission The head of the transmission packet transmitted by the unit is synchronized with a reference signal transmitted by wire as the second category information.
According to the above configuration, the wireless transmission unit and the wireless reception unit that transmit and receive the first category information can be realized with a simple circuit configuration, and wireless transmission using electromagnetic waves (radio waves) for signal transmission can be achieved. In particular, since a common control signal superimposed and transmitted on the power supply line is used on the transmitting side and receiving side of signals transmitted wirelessly, it is possible to absorb variations in characteristics and timing at the transmitting and receiving ends, so high-precision components Good quality communication can be ensured without using the.

Wherein the information transmitting unit modulates the first category information by the spread spectrum modulation also the information receiver is demodulated spectrum despreading, synchronization information and / or carrier information of the spreading code of the modulation and demodulation of the electronic apparatus of the present invention is the The second category information is generated from a reference signal transmitted by wire and synchronized.

  According to the above configuration, a plurality of signals can be multiplexed and transmitted without being serialized by spread spectrum modulation, and real-time characteristics are good. In addition, since a spreading gain can be obtained, it is possible to construct a robust system that can reduce interference caused by an electromagnetic wave signal transmitted to the system or interference received from the system. Furthermore, since synchronization information and / or carrier wave information is transmitted by being superimposed on the power supply line at the transmission / reception end, the reception end can use the signal to reproduce the synchronization timing and carrier wave. A synchronization circuit is not required, and a simple despreading circuit can be used, so that the circuit can be easily simplified. Also, the carrier wave can be reproduced with a simple circuit, and the circuit can be simplified. Moreover, since the second category information is superimposed on the power supply line, the number of wirings can be minimized.

The information transmission unit of the electronic apparatus of the present invention is the first category information modulated by UWB modulation, the synchronization information is generated from the reference signal wire transmission as the second category information synchronization pulse template for demodulation It is characterized by being taken.

  According to the above configuration, high-speed and high-reliability data transmission is possible even in a strong electromagnetic field environment of an electronic device in which electromagnetic wave generation is a basic function, such as a mobile phone that communicates by radio waves. In the case of UWB communication, the definition of the maximum radiated electromagnetic field allowed by law is relaxed, and the design on the receiving side becomes easier. Further, since the UWB modulator and demodulator use the same synchronization information transmitted by wire, a circuit for extracting synchronization on the receiving side is unnecessary, and the circuit can be simplified. Moreover, since the second category information is superimposed on the power supply line, the number of wirings can be minimized.

The electronic apparatus according to the present invention includes a display body, a storage unit that stores information to be displayed on the display body, a display control unit that reads out and outputs display information from the storage unit in accordance with a driving order of the display body, and the control In an electronic apparatus having a display body driving unit that drives the display body based on display information read by the unit, information transmitted between the control unit and the display body driving unit is wirelessly transmitted as the first category information. It is characterized by that.

  According to the above configuration, display information to be displayed on the liquid crystal can be transmitted through the space without complicating the system, and wiring for that is not necessary, and wiring such as a flexible substrate and a connector can be simplified. Cost and reliability issues are eliminated. In addition, it is possible to avoid the problem of power consumption that increases with the termination for impedance matching and the increase in data transmission speed. In addition, it is possible to alleviate restrictions on wiring routing and component placement, and improve the design and usability of the electronic device. Furthermore, since the electromagnetic waves used for signal transmission are performed within a short distance in the same system, it is only necessary to ensure communication within this distance, and the intensity of the radiated electromagnetic waves can be lowered to the limit. Essentially improved and countermeasures become easier. Moreover, since the second category information is superimposed on the power supply line, the number of wirings can be minimized.

  An electronic apparatus according to an aspect of the invention includes an imaging device, an imaging control unit that reads and outputs an image signal from the imaging device, and a processing unit that receives and processes an output signal of the imaging control unit. Information transmitted to and from the processing unit is wirelessly transmitted as the first category information.

  According to the above configuration, since the exchange of signals between the image sensor and the host side using the image data obtained by the image sensor is wireless, no wiring is required between them, and the exposure is increased as the image sensor becomes larger. Can avoid various problems. In other words, it can be easily mounted even in a clamshell structure, eliminates the need for wiring such as flexible boards and connectors, eliminates the problems of high cost and reliability caused by these, and what effect can be applied to high transmission speeds. is there. In particular, in the camera, the optical system and the electronic component must be mounted in the same casing, and there are many restrictions on mounting the electronic component. However, the above-described configuration of the present invention can alleviate this restriction. Moreover, since the second category information is superimposed on the power supply line, the number of wirings can be minimized.

  The electronic apparatus according to the present invention is characterized in that information transmitted between an electronic circuit on an integrated circuit and the outside of the integrated circuit is wirelessly transmitted as the first category information.

  According to the above configuration, since some of the input / output pins of the package of the semiconductor integrated circuit can be made wireless, the number thereof can be reduced and the size and cost of the package can be reduced. Moreover, since the second category information is superimposed on the power supply line, the number of wirings can be minimized.

  An electronic apparatus according to the present invention is an electronic device including a display unit, a speaker unit, image data to be displayed on the display unit, and a data source unit that generates acoustic data for driving the speaker unit. The image data and sound data transmitted between data source units are wirelessly transmitted as the first category information.

  According to the above configuration, data between speakers and screens of multimedia equipment that handles video data and audio data and the tuner decoder section is transmitted wirelessly as the first category information. The convenience of handling the system can be greatly improved. In addition, the second category information superimposed on the power supply line greatly simplifies the hardware for wireless communication.

  As described above, according to the above-described configuration of the present invention, it is possible to use wireless data transmission by electromagnetic waves at a very short distance as in the same device or the same system of electronic devices, and the conventional high-speed data transmission. Various problems and mounting problems can be eliminated, and an electronic device with low cost, high reliability, and low power consumption can be realized.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a conceptual diagram showing the main part of an embodiment of an information transmission system according to the present invention. It is assumed that data is transmitted from the transmission unit block 112 to the reception unit block 113. A circuit 101 has information to be transmitted, and a circuit 104 receives the transmission information. The transmission information emitted from the transmission block 112 is categorized, and the first category information modulates the transmission data by the modulator 102 and transmits it as an electromagnetic wave from the transmission antenna 110. The second category information is superimposed on the power supply line through the interface circuit 103, and is transmitted in a wired manner together with the power supply. An electromagnetic wave signal transmitted from the transmitting antenna 110 and carrying the first category information propagating through the space (propagation path 108) is received by the receiving antenna 111, demodulated by the demodulator 106, and output to the circuit 104. The second category information superimposed on the power supply line and transmitted by wire transmission is transmitted to the circuit 104 via the interface circuit 105. The second category information may be transmitted from the data reception block 113 to the transmission unit block 112, and in this case, is transmitted from the interface circuit 105 to the interface circuit 103.

  As the first category information, high-speed data that is difficult to transmit by wire or parallel data that requires multiplexing such as a bus line is selected. This is mainly information generated by the circuit 101, and information belonging to the first category is transmitted wirelessly. The electromagnetic field radiated from the transmitting antenna 110 is set so as not to exceed the upper limit determined by law. The radiation level allowed for a radio station that does not require a license is much lower than the EMI regulations. However, since the communication distance is very close, a communication path with sufficient quality can be obtained by appropriately setting the link budget. It can be secured.

  In this way, a large amount of information that requires high-speed transmission is not transmitted via the signal line, but it is not necessary to use the signal line because it propagates through the space by radio, and the conventional problems of the connector and the hinge structure associated therewith can be eliminated. . In addition, with conventional signal line transmission, charging / discharging to stray capacitance increases as the speed increases, and power consumption increases. Further, unnecessary radiated power emitted from the signal line increases, making it difficult to prevent interference with surrounding equipment. There was a drawback of becoming. In the transmission by the signal line, since the logic level is defined, the power consumption cannot be essentially reduced, and there is only a coping therapy such as shielding enhancement to reduce unnecessary radiation. According to such a method of the present invention, it is sufficient that the radiated power transmitted from the transmitting antenna 110 is sufficient to ensure sufficient communication quality at a close distance in the same system, so the radiated power from the transmitting antenna 110 is reduced to this value. Therefore, power consumption and EMI countermeasures are substantially improved and facilitated. Moreover, it is freed from restrictions such as an increase in power consumption accompanying the termination for impedance matching of communication lines, arrangement of parts, and routing of lines.

  Since the communication distance used in the present invention is limited to the same casing or the same system using the same power source, a simpler method than the technique used in the conventional wireless communication device can be taken. The method embodying the method is the second category information superimposed on the power supply line and transmitted by wire. As the second category information, information that does not require high-speed mass data transfer, synchronization information for wireless transmission / reception, transmitter information, feedback information that feeds back a data reception state, and the like can be considered. The interface circuit 103 or the interface circuit 105 itself Can be included in the second category information. The interface circuit 103 also collects the second category information generated by the circuit 101 and finally sends out the second category information generated by itself as second category information.

  In particular, if the synchronization information of the communication packet can be acquired regardless of the wireless transmission path, a circuit for extracting the synchronization information on the receiving side is unnecessary, and the circuit on the receiving side can be greatly simplified. Also, the correlator structure can be greatly simplified by sending the correlator synchronization information necessary for spread spectrum and UWB (Ultra Wide Band) communication. Furthermore, if the transmitter information can be transmitted, the clock signal used as a reference between the transmission and reception can be made common, and the transmission frequency accuracy required for the transmitter can be remarkably eased, and the electronic device can be easily realized. Further, in the case of an electronic device having a short-range communication interface such as a mobile phone, Bluetooth, or UWB (Ultra Wide Band), the electromagnetic wave that transmits the first category information interferes with the original communication of the electronic device. In some cases, the electromagnetic wave that transmits the first category information by exchanging the operation status of the electronic device between the transmission and reception of the first category information as the second category information so as not to disturb the radio wave used by the electronic device. It is possible to change the frequency and eliminate interference with the original communication. That is, as the second category information, the frequency of the transmission channel can be selected for a mobile phone or the like, and the hopping pattern or the like can be selected for Bluetooth or UWB. These signals can be generated from the interface circuit 103 or the interface circuit 105.

  The second category information may be sent from the reception side of the first category information toward the transmission side. In this way, the reception status of the first category information is fed back. For example, a retransmission request, a request for increase / decrease in radiated electromagnetic wave energy, a pre-emphasis parameter for improving transmission path distortion, and the like are transmitted from the reception side to the transmission side. It is possible to improve the quality of communication with a small hardware cost. In particular, if a request for increase / decrease in radiated electromagnetic wave energy is fed back, the minimum electromagnetic wave energy that can ensure communication quality on the receiving side can be set, and unnecessary radiation can be reduced. This is a signal level of the receiving end is defined, and is a value lower than the unnecessary radiated electromagnetic field energy of the high-speed data transmission by the conventional wire that is driven together with the stray capacitance with a large energy in order to secure the specified value, EMI countermeasures become extremely easy. In addition, since there is no signal line to be driven including the stray capacitance and transmission is performed wirelessly, power consumption can be reduced.

  The second category information is superimposed on the power supply line 107 together with the power supply, and is transmitted / received between the transmission block 112 and the reception block 113. The power supply 116 supplies power to all circuits in the transmission block 112, and the second category information generated by the interface circuit 103 is superimposed on the power supply line by the superimposing circuit 115. Details of the inside of the superimposing circuit 115 will be described within a one-dot chain line 117. The terminal 128 is connected to the power supply 116, and the terminal 129 is connected to the power supply line 107. The second category information emitted from the interface circuit 103 is superimposed on the power supply line 107 through the high-pass filter 124 from the terminal 125. The signal of the second category information superimposed by the low-pass filter 127 does not leak to the terminal 128 side, and therefore all the circuits of the transmission block 112 operate correctly. The second category information superimposed on the power supply line 107 is separated by the separation circuit 114 and transmitted to the interface circuit 105. The inside of the separation circuit 114 will be described in detail in the alternate long and short dash line 118. The terminal 121 is connected to the power supply line 107. The signal of the second category information entering the terminal 107 is separated by the high pass filter 123 and transmitted to the interface circuit 114 from the terminal 120. The low-pass filter 122 transmits only the energy supplied from the power supply from the terminal 119 in order to prevent the leakage of the second category information, and correctly supplies the power to all the circuits in the receiving block through the terminal 119. When the second category information is sent from the reception block 113 side to the transmission block 112 side, the functions of the superimposing circuit 112 and the separation circuit 114 are reversed, but the same circuit configuration may be used as shown in FIG.

  By adopting such a configuration, the second category information for remarkably simplifying the transmission / reception modulation / demodulation circuit can be transmitted by superimposing it on the power supply line, so that signals within the electronic device can be exchanged with the minimum number of wirings, and simplified. A highly reliable electronic device can be realized by a simple method.

  FIG. 2 is a diagram showing an embodiment of an electronic apparatus according to the present invention. In the embodiment, the electronic device is divided into a main body portion 205 and a display portion 212 and integrated through a hinge 207. The power source 213 is provided in the main body 205, and is supplied to each electronic circuit in the main body through wiring on the substrate in the main body 205, and the second category information is superimposed by the superimposing circuit 214 and sent to the display unit 212 through the electric wire 211. . The separation circuit 215 separates the superimposed power source and the second category information, and the power source is distributed to each circuit of the display unit 212 through wiring on the substrate of the display unit 212. Reference numeral 203 denotes a main body board that controls the functions of the electronic apparatus main body. Various input / output devices such as a keyboard and a display device are connected to the electronic device. Reference numeral 204 denotes a keyboard as an input device, and 206 denotes a liquid crystal display as a display device. A liquid crystal controller 208 generates display data by controlling an electronic circuit on the main body substrate 203. Display data generated by the liquid crystal controller 208 is sent to the modulator 200 as first category information, modulated, converted into electromagnetic waves (radio waves) from the transmitting antenna 209, and propagated through space. The electromagnetic wave signal transmitted from the transmitting antenna 209 is received by the receiving antenna 210, demodulated into display data by the demodulator 202, sent to the liquid crystal driver 201, and displayed on the liquid crystal display 206.

  The synchronization signals of the modulator 200 and the demodulator 202 are superimposed on the power line 211 by the superimposing circuit 214 as second category information and sent to the separating circuit 215 through the power line 211, and the separating circuit 215 receives the second category information from the power source. Separate and transmit to demodulator 202. Since this signal does not have a very high data rate and the number of necessary signal lines is small, it is easy to superimpose it on the power supply line and to route it through the hinge. The degree of freedom of wiring and component arrangement is also increased, and it is possible to arrange the modulator 200 as a signal transmission unit, the transmission antenna 209, the demodulator 202 as a reception unit, and the reception antenna 210 as shown in FIG. It is.

  As data to be transmitted increases in speed, it becomes difficult to transmit the transmission line, but transmission by electromagnetic waves in the space becomes easier. In this way, if a signal is sent through a wired path to synchronize the modulator / demodulator, synchronization detection for synchronization is unnecessary on the demodulator side, and the circuit can be simplified. Moreover, since the wired path is shared with the power supply line, the number of wires is minimized. With the recent improvement in semiconductor device manufacturing technology, it is possible to simplify and incorporate a high-frequency wireless transmission modem in this manner at a low cost and high practicality.

  FIG. 3 is a block diagram showing more details of the information transmission method according to the present invention and an embodiment of an electronic device using the information transmission method. The CPU 301 generates display data to be displayed by calculation or the like and records it in the video memory 302. The liquid crystal controller 303 reads data 319 to be displayed on the display body from the video memory 302 in a predetermined order, and outputs the data 319 together with the vertical synchronization signal 321 and the horizontal synchronization signal 320. Since the data 319 to be displayed is read as data in parallel for each word from the normal video memory in units of pixels, the data 319 is subjected to parallel conversion by the parallel conversion circuit 304 and transmitted to the logic circuit 307. The logic circuit 307 receives the parallel-to-serial conversion circuit 304, the horizontal synchronization signal 320, and the vertical synchronization signal 321, generates a packet, sends it to the modulator 308 as first category information, and supplies a reference signal 306 representing the head of the packet to the second category information. To the PLL 309 and the superimposing circuit 326. The first category information is generated by multiplying the reference signal 306 by the PLL 309 and generating a carrier wave synchronized with the reference signal. This carrier wave is modulated by the modulator 308 and transmitted from the transmission antenna 310. At the same time, the reference signal 306 is superimposed on the power line 330 by the superimposing circuit 326 as the second category information and is transmitted to the separating circuit 327 on the receiving side.

  The reception antenna 311 receives the electromagnetic wave signal transmitted from the transmission antenna 310, is amplified by the preamplifier 312, removes unnecessary band components by the bandpass filter 313, and is input to the demodulator 314. Also, the reference signal superimposed and transmitted as the second category information on the power supply line 330 is separated by the separation circuit 327, multiplied by the PLL 315 based on this output, the carrier wave is restored, supplied to the demodulator 314, and the electromagnetic wave Demodulate the signal. The logic circuit 316 detects a preamble in the received signal packet, generates display data 322 in the packet, a horizontal synchronizing signal 323, a vertical synchronizing signal 324, and a transfer clock 325 of the X driver from the packet, and outputs them to the driver of the liquid crystal display 318. Display.

  The oscillation frequency of the PLL 309 and the PLL 315 is selected so as not to interfere with the original purpose of an electronic device that uses radio waves such as a radio receiver or a mobile phone. If a frequency of 2 GHz or higher is selected, the occupied band is about 200 MHz even if data of 100 Mbps is transmitted, and can usually be used without problems in most cases.

  In general, in wireless communication, the transmitter-side modulator and the receiver-side demodulator need to handle the same carrier frequency, and the carrier oscillator frequency between transmission and reception is required to have high accuracy. This error appears as direct communication quality degradation. However, according to the above-described configuration of the present invention, the modulator 308 and the demodulator 314 use the same reference signal 306 and are multiplied by the PLL 309 and the PLL 315 to generate the carrier wave. The accuracy of the carrier wave transmitter is not a problem and has a cost reduction effect. Instead of the reference signal 306, the output of the PLL 309 may be directly superimposed on the power line 330 by the superimposing circuit 326 and transmitted. In this case, the carrier wave separated by the separation circuit 327 can be directly input to the demodulator 314 without using the PLL 315, and the PLL 315 is unnecessary. However, since the carrier frequency is generally high, it is difficult to transmit the wired path. As described above, it is more feasible to generate a carrier wave by multiplying by a PLL having uniform characteristics in both transmission and reception using a reference signal having a low frequency.

  The reference signal 306 is a signal representing the head of the packet for sending the first category information, and this reference signal is sent as the second category information superimposed on the power line, so that the receiving side can easily set the head of the packet. Can be detected. Therefore, the circuit for extracting data from the packet becomes very simple, the provision of a preamble representing the head of the packet is not required, the packet structure can be greatly simplified, and the effective communication rate can be increased.

  By adopting the above configuration, high-speed and large-scale display data can be wirelessly displayed on the display body, and power consumption, wiring position restrictions, EMI countermeasures, and reliability assurance that have become more apparent as the display body becomes larger Various problems caused by wired transmission can be eliminated.

  Further, since the second category information is superimposed on the power supply line, no special wiring for the second category information is required. The implementation effect is also great when realizing electronic devices.

  FIG. 4A is a block diagram of a main part of an embodiment of the electronic apparatus according to the present invention, and is a diagram illustrating the modulator 308 and the demodulator 314 of the embodiment 3 in more detail. The PLL 402 corresponds to the PLL 309 of the third embodiment, and is a transmitter that multiplies the reference signal generated by the control circuit 407 and generates a rectangular pulse carrier wave synchronized with the reference signal. The multiplier 401 multiplies the PLL 402 and the input data 403, outputs it as a transmission signal 404, and sends it to the transmission antenna. The multiplier 401 may be an exclusive OR circuit because both the input data 403 and the PLL 402 output are digital signals. When an analog value of value 1 is associated with logic 0 and an analog value of value -1 is associated with logic 1, the input / output of the exclusive OR circuit functions as a multiplier. In addition, since the communication distance is very close, harmonic interference given to other devices and the like can be suppressed to a low level, so that a filter or the like is not required between the antenna and the modulator output.

  The demodulator operates as follows. The received signal received by the receiving antenna 311 (FIG. 3) is amplified to remove unnecessary bands, then input to the multiplier 405 as the received signal 407, multiplied by the carrier clock signal regenerated by the PLL 408, and then the low-pass filter. At 406, the high frequency component is removed and the demodulated signal 409 is demodulated. The low-pass filter 406 removes the high-frequency component (thin pulse component generated by a slight phase shift difference between the received signal 407 and the reproduced clock waveform of the PLL 408) from the output of the multiplier 405 and outputs it as a demodulated signal 409. The PLL 408 multiplies the reference signal generated by the control circuit 407 that is superimposed and transmitted on the power supply line as the second category information, and reproduces a carrier pulse whose phase is synchronized at the same frequency as the PLL 402. In FIG. 4A, the superimposing circuit and the separation circuit are omitted, but it goes without saying that they are actually inserted between the control circuit 407 and the PLL 408.

  5A to 5C show time charts of the modulator described above. 10A shows a carrier clock signal generated by the transmission side PLL, that is, the PLL 402, FIG. 10B shows transmission data 403, and FIG. 10C shows an output transmission signal 404. If the time diagram of FIG. 6 is viewed as a digital circuit, the modulator is an exclusive OR, and if viewed as an analog value having a value of ± 1, the modulator is a multiplier.

  5D to 5F show time charts of the demodulation circuit. That is, (d) is a received signal, (e) is a pulse train generated from the PLL on the receiving side, that is, PLL 408, (f) is the output of the multiplier 405, and the low-pass filter 406 receives the received signal 407 and PLL 408 from this signal. A high frequency component generated by a slight phase difference of the output is removed, and the demodulated signal 409 is restored.

  As can be seen from the figure, if the transmission side carrier clock (FIG. 5 (a)) and the reception side recovered carrier clock (FIG. 5 (e)) are different in frequency or out of phase, demodulation does not work well. Conventional wireless communication has separate transmitters and receivers with high-accuracy transmitters to minimize errors. According to this configuration of the present invention, the generation of carrier waves on the transmission side and the reception side is generated by the PLL having the same characteristics with reference to the reference signal generated by the control circuit 407 on the transmission side, so that the same frequency can always be secured. Therefore, there is no error due to the stability of the transmission frequency and the frequency accuracy. A circuit with extremely high stability can be constructed even with an inexpensive circuit.

  If the time chart of FIG. 5 is viewed as a digital circuit, the modulator is an exclusive OR, and if it is viewed as an analog value taking a value of ± 1, the modulator is a multiplier. Since the wireless signal transmission used in the present invention has a short communication distance and can secure communication quality with a sufficiently high S / N ratio, the signal can be amplified to a level that can be regarded as a digital value. In this case, the amplified signal level is increased to a logical value level, but the load driven by the logical value is not a long distance with a large stray capacitance such as from the CPU to the display body. Short and low load does not increase power consumption. Even if the received signal is an analog level that is not amplified to a logical value level, the PLL 408 output is rectangular (takes a value of ± 1), so that multiplication can be realized with a simple switch circuit. That is, two amplifiers having the same absolute value of amplification degree and opposite polarity are prepared for the received signal, the inverting amplifier output is selected by the switch when the logic level of the PLL 408 output is 1, and the normal amplifier output is selected when the logic level is 0. Can be realized. A circuit having such a structure may be used as the multiplier 407.

  According to the above configuration, the modulator can be realized very simply by an exclusive OR circuit, and the demodulator can be realized by one exclusive OR circuit or an amplifier and a switch circuit having positive and negative amplification degrees, and a low-pass filter.

FIG. 4B is a diagram showing a block diagram of a main part of an embodiment of the electronic device according to the present invention, and is a diagram illustrating in more detail another example of the modulator 308 and the demodulator 314 of the third embodiment. In the fourth embodiment, BPSK modulation is simplified, but in the fifth embodiment, an example based on QPSK is given to show a case where more general phase modulation is used. The PLL 413 corresponds to the PLL 309 of the third embodiment, and is a rectangular pulse oscillator that multiplies the reference signal generated by the control circuit 417 and generates a carrier wave synchronized with the reference signal. In QPSK, transmission is assigned with 2 bits per symbol (ie, data bit 1 410 and bit 2 411), and is encoded and transmitted. That is, the phase shift amount is encoded and modulated as shown in Table 1 for transmission with respect to the reference clock. The encoder 412 controls the phase shifter 414 and the multiplier 415 so that the phase shift as shown in Table 1 is performed according to the bit pattern of the data bit 1 410 and the data bit 2 411.

  5 (g) to 5 (j) are time charts showing the operation of each part of the modulator shown in FIG. 4 (b). Bit 1 410 (FIG. 5 (h)) and bit 411 (FIG. 5 (i)) of the transmission data are encoded by the encoder 412, and the phase of the carrier wave (FIG. 5 (g)) oscillated by the transmitting PLL, ie, PLL 413 is shifted. Whether the phase shift of 90 ° is performed by the multiplier 414 and whether the carrier wave is inverted (180 ° phase shift) is controlled by the multiplier 415, and finally the transmission signal 415 subjected to QPSK modulation (FIG. 5 (j )) Is output.

  The control circuit 417 corresponds to the logic circuit 307 of the third embodiment, and the reference signal generated by the control circuit 417 is superimposed on the power supply as second category information and transmitted to the reception side. In FIG. 4B, the superimposing circuit and the separation circuit are omitted, but it goes without saying that they are actually inserted between the control circuit 407 and the PLL 408. The PLL 420 corresponds to the PLL 315 of the third embodiment and multiplies the reference signal transmitted by being superimposed on the power supply line, and generates a reproduction clock, that is, a receiving side carrier wave (FIG. 5 (l)). The recovered clock output from the PLL 420 is multiplied by the received signal 418 (FIG. 5 (k)) by the first multiplier 419 and transmitted to the first low-pass filter (LPF) 423 to remove the high-frequency component and to the discrimination circuit 425. Reportedly. At the same time, the received signal 418 is also multiplied by the second multiplier 421 by a pulse train (FIG. 5 (o)) obtained by shifting the regenerated clock pulse train generated by the PLL 420 by 90 ° by the 90 ° phase shifter 422 and the second low-pass filter ( LPF) 424 removes the high frequency component and transmits it to discrimination circuit 425. The determination circuit 425 demodulates the reception signal by calculating transmission data from the outputs (FIG. 6 (n) and (q)) of the first and second low-pass filters.

  According to the above configuration, the speed of data transmission can be increased without increasing the occupied band of the transmission signal. Also, since the modem can be realized by a simple digital circuit, it can be incorporated in a semiconductor chip, and the increase in cost and power consumption can be ignored. The carrier clock required for transmission and reception is obtained by multiplying the reference signal generated by the same control circuit for transmission and reception by a PLL having the same characteristics to obtain the same frequency with the same phase. There is no error. Stable data transmission is possible even with an inexpensive transmitter. Even if the control circuit 417 unilaterally changes the reference signal, the transmission side and the reception side always follow. Therefore, in an electronic device such as a wireless communication device, the frequency does not interfere with the communication channel according to the communication channel. Can be selected and changed unilaterally. (This is the same in any of the third and fourth embodiments.) If this property is used well, it is possible to remarkably facilitate interference and countermeasures against communication originally intended for electronic devices such as communication devices. It is.

  FIG. 6 is a block diagram showing a main part of an embodiment of another information transmission method and electronic apparatus according to the present invention. The functions of the CPU 601, the video memory 602, and the liquid crystal controller 603 are the same as those described in the third embodiment, and the display data 625, the horizontal synchronizing signal 623, and the vertical synchronizing signal 624 generated by the liquid crystal controller 603 are spread code generators. The code is multiplexed by the code multiplexing circuit 604 with the spreading code generated by 605. In this embodiment, since parallel data is code-multiplexed as follows, parallel / serial conversion by the parallel / serial conversion circuit 304 of the third embodiment is unnecessary, and therefore, the inverse conversion, that is, the serial / parallel conversion circuit 317 is also unnecessary. Code sets that are orthogonal to each other are often used as spreading codes. The spread code is generated in synchronization with the horizontal synchronization signal 623 generated by the liquid crystal controller 603 at the head of the code. Further, since the spread code generator 605 clock uses a signal obtained by multiplying the horizontal synchronizing signal 623 by the PLL 606, the carrier wave and the spread code are completely synchronized. Since the display data 625 is read from the video memory 602 for each pixel, it is output as parallel digital data. Each bit of the data signal, the horizontal synchronizing signal 623 and the vertical synchronizing signal 624 are multiplied by each code generated by the spread code generator 605 (exclusive OR), and analog addition is performed for code multiplexing. The multiplexed signal is modulated by the modulator 607 with the carrier wave generated by the PLL 606 and transmitted through the propagation path 626 (space) by the electromagnetic wave signal as the first category information from the transmitting antenna 608. Since the carrier wave is generated by multiplying the horizontal synchronization signal 623 by the PLL 606, the carrier wave is completely synchronized with the horizontal synchronization signal 623. As described above, the horizontal synchronizing signal 623 is also synchronized with the spreading code generator 605. The horizontal synchronizing signal 623 is also superimposed on the power supply line 623 by the superimposing circuit 613 as the second category information and is sent to the receiving side separating circuit 622.

The transmitted electromagnetic wave signal is received by the receiving antenna 609, amplified by the preamplifier 610, an unnecessary signal other than a predetermined band is removed by the band pass filter 611, and then demodulated by the demodulator 612. The PLL 615 separates the horizontal synchronization signal 623 transmitted as the second category information superimposed on the power supply line 627 by the separation circuit 622, and multiplies it based on this to generate the number of conveyances. The signal demodulated by the demodulator 612 is separated from the multiplexed data by calculating the correlation with the spreading code for multiplexing generated by the spreading code generator 616 by the despreading circuit 614. The logic circuit 617 performs waveform shaping and timing adjustment on the display data signal 618 for driving the liquid crystal driver from the detected display data and various timings, the horizontal synchronization signal 619, the vertical synchronization signal 620, and the clock signal 621 of the X driver to perform liquid crystal display. The display is sent to the liquid crystal display as a body drive signal.
The carrier waves of the demodulator 612 and the modulator 607 are synchronized with the horizontal synchronizing signal 623 as the same reference signal and are oscillated by the PLL 606 and the PLL 615 having the same characteristics. . In addition, since the head of the spreading code coincides with the horizontal synchronization signal on both the transmission side and the reception side, it is not necessary to detect the timing for despreading. This eliminates the need for a circuit for acquisition of synchronization on the receiving side and simplifies the circuit. Particularly in the case of code multiplexing, it is possible to use a correlator instead of a matched filter as a despreading circuit. As is well known, in despreading, the matched filter has a complicated circuit, but the response time is short and synchronization is unnecessary. On the other hand, when the correlator is used for despreading, despreading cannot be performed unless synchronization is achieved. Usually, since the calculation is performed by trial and error by sliding one chip at a time, despreading cannot be performed immediately. However, according to the above configuration of the present invention, since the correlator synchronization information is sent as the second category information by wire, it is not necessary to perform synchronization acquisition or sliding, and despreading is possible with a very simple circuit.

  Further, since the horizontal synchronizing signal 623 and the vertical synchronizing signal 624 are also code-multiplexed and transmitted together with the display data 625, the receiving side can immediately detect the synchronizing signal for displaying them by despreading. Since the horizontal synchronization signal 623 is also superimposed on the power line as the second category information and transmitted, this signal may be used as the horizontal synchronization signal 619 without code multiplexing.

  According to the above configuration, signals can be multiplexed and transmitted / received without performing parallel / serial conversion of data, and this has the same effect as routing many bus lines in parallel. In particular, multiplexing by orthogonal codes is less restricted and does not require physical space like a bus line. It is also possible to provide a plurality of transmission units and reception units and perform simultaneous communication in several different places where signal transmission / reception is necessary. In addition, it is possible to increase the diffusion gain by diffusion, and in particular, it is effective in improving the anti-interference and interference characteristics with the original intended radio wave in a device that generates radio waves such as a mobile phone. In order to increase the spreading gain, a spreading code having a sufficiently wide frequency band may be selected, and further spreading modulation may be performed after the modulator 607. Since synchronization information and carrier frequency information are transmitted as the second category information superimposed on the power line, it is easy to match the carrier frequency between transmission and reception without adding a special wired line. Does not require accuracy. In addition, synchronization acquisition for despreading and packet synchronization is not required, and the despreading circuit can be greatly simplified and the feasibility is high.

  FIG. 7 is a block diagram showing a main part of still another embodiment of the electronic apparatus according to the present invention, and shows an example in which the information transmission system according to the present invention is applied to an electronic apparatus using an image sensor. The image sensor 701 is activated by the horizontal synchronization signal 720 and the vertical synchronization signal 721 generated from the control circuit 702 and outputs image data 719 captured. The logic circuit 703 receives these signals and constructs a packet for wireless transmission. The packet is modulated by a modulator 705 and radiated as an electromagnetic wave from a transmission antenna 707. The carrier wave used for the modulator 705 is oscillated by multiplying the reference signal generated by the control circuit 702 by the PLL 706. As the reference signal, for example, a signal indicating the head of a packet constructed by the logic circuit 703 or a horizontal synchronization signal 720 for activating the image sensor is used by the control circuit 702. This reference signal is superimposed on the power line 723 as the second category signal by the superimposing circuit 704 and sent to the separating circuit 711 on the receiving side.

  The electromagnetic wave signal transmitted from the transmitting antenna 707 propagates through a wireless propagation path (space) 722, is received by the receiving antenna 708, is amplified by the preamplifier 709, and is demodulated by removing unnecessary out-of-band signals by the bandpass filter 710. Input to the device 712. The PLL 715 generates a carrier wave by multiplying the reference signal extracted by the molecular circuit 711 from the power line 723 as the second category information. The demodulator 712 also demodulates the received signal using the synchronization timing necessary for demodulation from the reference signal from the control circuit 702 transmitted through the wired path 723 as the second category information. 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. Since these circuits can use the reference signal from the control circuit 702 as the second category information, it is not necessary to perform signal detection for synchronization, and the circuit configuration can be remarkably simplified. Further, since the carrier frequency is always synchronized with the transmission side and tracking is performed, the required accuracy is remarkably eased.

  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, but in order to transmit information related to the activation to the control circuit 702 of the image sensor, the second category information can be superimposed on the power supply line and transmitted by wire, but wirelessly transmitted. You can also. In the case of the wireless transmission, both the CPU side and the image sensor side have wireless transmission / reception means to perform bidirectional communication. In particular, in a mobile phone having a clamshell structure, the image sensor and the display element are placed close to each other and are often on the opposite side of the CPU side. The captured image data is sent to the CPU side for processing and then displayed on the display element side. Sent back. Such a case can be realized by adopting a configuration in which the third embodiment is placed back to back. The second category information only needs to be on the side where the control circuit is placed, and both can be synchronized by using the reference signal of the control circuit in common.

  Various configurations caused by wired transmission such as power consumption, wiring position restrictions, EMI countermeasures, reliability assurance, etc., which have become more apparent with the above configuration, that is, by making data transmission from the imaging element wireless You can eliminate the problem. On the receiving side, since the synchronization timing necessary for demodulation is superimposed on the power supply line and sent, there is no need for synchronization acquisition, and the circuit can be greatly simplified with the minimum number of wires. In addition, since the carrier wave generated by the same transmission source between the transmission and reception is used as a reference, the frequency accuracy required for the carrier wave oscillator is remarkably relaxed, which has a great effect on cost reduction and feasibility.

  FIG. 8 is a block diagram showing the main part of an embodiment of the data transmission and electronic device according to the present invention. The functions of the CPU 801, video memory 802, and liquid crystal controller 803 are the same as those described in the third and sixth embodiments. The display data 825, the horizontal synchronization signal 823, and the vertical synchronization signal 824 generated by the liquid crystal controller 803 are rearranged and rearranged by the logic circuit 804, such as preamble assignment and packet construction, and converted into serial signals. The primary modulator 805 modulates the pulse train generated by the pulse generator 806 to this signal. For primary modulation, pulse position modulation or biphase pulse modulation can be used for the pulse train. The signal subjected to the primary modulation is spread and modulated by the spread modulator 807 with the spread code generated by the spread code generator 808.

  The spread modulated pulse train is radiated as an electromagnetic wave by the transmitting antenna 810 after being subjected to waveform shaping into a very short time pulse so as to become a broadband pulse having a low spectral density by the pulse shaping circuit 809. The radiated electromagnetic field is not a sine wave modulated but a very thin pulse train. Communication using short pulses and wide-band pulses in this manner is called an impulse radio (Umpulse Radio) or UWB (Ultra Wide Band) communication system.

  On the other hand, the horizontal synchronization signal 823 also determines a reference for pulse generation for pulse modulation such as pulse position modulation. This signal is superimposed on the power supply line by the superimposing circuit 828 as a reference signal for the second category information and transmitted to the separating circuit 829 on the receiving side.

  The radiated electromagnetic wave is received by the receiving antenna 811 through the wireless propagation path 826, amplified by the preamplifier 812 as necessary, and then correlated with the pulse template generated by the pulse generator 813 by the correlator 814. The The output of the correlator 814 is despread by the despreading circuit 815 by the spreading code generated by the spreading code generator 816, demodulated by the demodulator 817, and converted to a signal before the primary modulation (input of the primary modulator 805). . The logic circuit 818 displays a display data signal 819 for driving the liquid crystal driver based on the display data detected by the demodulator 817 and the horizontal synchronization signal 823 transmitted as the second category information superimposed on the power supply line 827 from the transmission side. The horizontal synchronizing signal 820, the vertical synchronizing signal 821 and the X clock signal 822 of the X driver are generated and sent to the liquid crystal display for display. If there is such reference timing information on the receiving side, the configuration of the correlator 814 and the logic circuit 818 is much simplified compared to the case where there is no reference timing information.

  Here, the essence of UWB communication is to use short pulses with extremely low spectral density. When UWB is used, the legal upper limit of radiant energy is allowed to the level of unnecessary radiation regulated by EMI, and is much looser (about 20 dB) than the upper limit of radio stations that do not require a license. For this reason, it is easy to set a link budget that can ensure sufficient communication quality even in an electronic device that generates a strong radio wave, which is the original purpose, such as a mobile phone. Since the pulse to be used can have a narrow pulse width and a high peak value, the preamplifier 812 can be omitted.

  In the case of an electronic device having UWB as a short-range communication interface, if this embodiment is applied to data transmission in the electronic device, they may interfere with each other and cause serious interference. Can be avoided by methods such as synchronizing the frequency, performing frequency hopping, and synchronizing the hopping sequence. In this case, the synchronization information in this case may be applied as the second category information.

  According to the above configuration, the modulation operation is performed only on the time axis, and most of the components can be realized only by the digital circuit that handles the pulse, and the circuit element can be easily integrated into an IC. By adopting a short pulse, it is possible to increase the spreading gain in the time direction and improve the anti-interference and interference characteristics with radio waves emitted as an original function of the electronic device, as well as the multi-channel as a communication transmission path.

  FIG. 9 is a diagram illustrating still another embodiment of the electronic apparatus according to the invention. This embodiment exemplifies another method of superimposing the second category information on the power supply line in the first to eighth embodiments. As the second category information, information having a high frequency such as a carrier wave cannot basically be superimposed on the power line. The purpose of the present invention was to transmit such a high frequency signal wirelessly because it cannot be transmitted successfully. Conversely, even if the frequency of the second category information is too low, it cannot be superimposed on the power line. Even if they can be superposed, they cannot be separated well on the receiving side, or the voltage level of the power supply line fluctuates, which seriously affects the operation of the device. If the frequency of the second category information is too low as described above, it is transmitted after being modulated as shown in FIG. The second category information input to the input terminal 901 is modulated by the modulator 903 and sent to the superimposing circuit 904. The superimposing circuit 904 can be easily configured with a high-pass filter and a low-pass filter in the same manner as the superimposing circuit 118 shown in FIG. A carrier wave input to the modulator 903 is oscillated by a carrier wave transmitter 902. The oscillation frequency can be superimposed on the power line, and an appropriate frequency that does not affect the electronic equipment is selected. The carrier wave transmitter 902 may be a means for dividing the carrier wave for transmitting the first category information by electromagnetic waves, for example. The power supplied from the power terminal 911 is superimposed on the second category information by the superimposing circuit 904 and sent to the power receiving end through the power line 905. The separation circuit 906 separates the second category information, outputs it to the demodulator 907, and supplies power from the terminal 912 to each part of the receiving unit. The demodulator 907 demodulates the second category information. The demodulated second category information usually has a time delay due to demodulation, but this is corrected by the circuit 909. The carrier wave generator 908 generates a carrier wave for demodulation. However, if delay detection or the like is used, a carrier wave is not necessarily required for demodulation. In order to simplify the circuit, a demodulation method that can omit the carrier wave generator 908 may be selected.

  Such a circuit can be incorporated on a semiconductor chip as a result of advances in semiconductor technology, and can be realized with almost no increase in cost.

  FIG. 10 is a diagram illustrating an embodiment of an electronic device using the information transmission method according to the present invention, which is an example used for data transmission between semiconductor chips. Reference numerals 1012 and 1013 represent semiconductor chips, and exemplify a case where data transmission is performed from the chips 1012 to 1013. Reference numeral 1001 denotes a circuit having (generating) a plurality of data to be transmitted in the semiconductor chip 1012, and reference numeral 1005 is a circuit for receiving the data in the semiconductor chip 1013. The control circuit 1003 is activated so that the circuit 1001 outputs data to be transmitted, and the multiplexing circuit 1002 receives the transmission data from the circuit 1001 and multiplexes it. Multiplexing uses parallel-serial conversion as described in the third embodiment and code multiplexing as in the sixth embodiment. Modulator 1004 receives the output of multiplexing circuit 1002, modulates it, and transmits it as an electromagnetic wave signal by transmitting antenna 1010. The control circuit simultaneously generates multiplexing, synchronization of synchronization and other timing signals and carrier waves. Signals that serve as a carrier reference are also generated using the methods described in the third to eighth embodiments, and these signals are transmitted as second category information by the superimposing circuit 1017 to the receiving side separation circuit 1016 through the power supply line 1014. Is done. The separation circuit 1016 extracts the second category information from the power supply line 1014 and transmits it to the control circuit 1006. The signal propagated through space (wireless propagation path) 1015 and received by the receiving antenna 1011 is demodulated by the demodulator 1008 and returned to the original multiplexed signal by the demultiplexing circuit 1007 and sent to the circuit 1005 for receiving the signal. . The control circuit 1006 receives multiplexing and modulation synchronization and other timing signals and carrier wave reference signals from the transmission side control circuit 1003 through the superimposing circuit 1017, the power supply line 1014 and the separation circuit 1016, and synchronizes demodulation and demultiplexing. The carrier wave used by the demodulator 1008 is restored. By using this method to synchronize with the same reference signal on the signal transmission side and signal reception side, the multiplexing, demultiplexing, and modulation / demodulation circuits can be greatly simplified, greatly reducing the need for transmission frequency accuracy. As a circuit on a semiconductor chip, all can be realized.

  The transmission / reception antenna 1010 or 1010 may be formed on the semiconductor chips 1012 and 1013, or a signal may be taken out of the chip via a bonding pad and the antenna may be externally attached.

  If a superposition circuit and a separation circuit as in the ninth embodiment are used, it can be realized in a wide range.

  By adopting such a configuration as described above, the number of pins of the semiconductor chip can be greatly reduced, and a significant amount of power can be obtained compared to the conventional method of driving together with the stray capacitance in order to extract a logic level signal through the bonding pad. Reduction is possible.

  FIG. 11 is a diagram illustrating still another embodiment of the electronic apparatus using the information transmission method according to the present invention, which is an example applied to a home theater. The home theater includes an image display unit 1105, a tuner decoder unit 1101, and a speaker unit 1124. The image display unit 1105 includes an image display device and receives and displays an image signal. The speaker unit 1124 is generally composed of a plurality of speakers 1111, 1112, 1113, 1114, and 1115, and a drive part that receives sound signals for each speaker and controls and amplifies acoustic effects to drive the speakers. The following methods are used for connection between them. The reproduction unit 1102 of the tuner decoder unit 1101 takes out image and audio data from an image and audio source such as a TV tuner and a DVD recorder in response to an instruction from the control circuit 1120. Data output from the reproduction unit 1102 is multiplexed for each image and audio channel by a multiplexing circuit 1103. Multiplexing is performed by multiplying the spread code generated by the spread code generator 1121 for each channel in synchronism with the reference signal generated by the control circuit 1120 and performing analog addition. The multiplexed data is modulated by the modulator 1109 and transmitted from the transmission antenna 1117 as first category information. The carrier wave oscillator 1104 multiplies based on the reference signal generated by the control circuit 1120 to generate a carrier wave. The reference signal generated by the control circuit 1120 is superimposed on the power line 1116 by the superimposing circuit 1125 as the second category information and transmitted to the image display unit 1105 and the speaker unit 1124. Unlike the first to tenth embodiments, the power supply line is an AC power supply, but the superimposing circuit 1125 and the separation circuit 1126 can be configured by a low-pass filter and a high-pass filter as shown in FIG. A terminal 1127 supplies power to each unit of the tuner decoder unit 1101 through a power line. The image data, text data, or audio data propagates through the wireless propagation path 1119 as first category information, is received by the receiving antenna 1118, demodulated by the demodulator 1107, despread by the despreading circuit 1108, and demultiplexed to demultiplex, and only the image signal is received. The extracted image data is stored in the display unit storage circuit 1110. The image data stored in the display storage circuit 1110 is sequentially read and displayed on the screen of the image display device built in the image display unit 1105.

  Similarly, information sent to the speaker unit 1124 is also replicated with the same configuration as that in the image display unit 1105. The description is redundant and will not be described in further detail.

  Here, the reference signal transmitted as the second category information superimposed on the power supply line 1116 is separated by the separation circuit 1126, and the control circuit 1123 on the receiving side defines the operation in the image display unit 1128 based on the reference signal. Various signals to be generated are generated. The carrier wave for demodulation is multiplied based on the control signal generated by the control circuit 1123, and the carrier wave oscillator 1106 oscillates. A multiplexing code generator 1122 used for despreading generates a spreading code in synchronization with a reference signal sent as second category information under the control of the control circuit 1123. By adopting such a configuration, the carrier wave is always tracked in both transmission and reception, so that the carrier wave having a high frequency accuracy required for the carrier wave transmitter is not required. Also, since the despreading code can be synchronized, the despreading circuit can be remarkably simplified.

  By adopting the above configuration, conventionally, a star-type signal line wiring is required from the tuner decoder unit to the speaker unit and the image display unit in addition to the power source line, and a complicated protocol for parallel conversion and high-speed transmission is required. What was taken is that it is possible to construct a system by connecting only the power line, which is remarkably simplified. In addition, even when all signals are transmitted wirelessly, the circuit and protocol are greatly simplified, and the practical effect is great.

  The present invention is not limited to the above-described embodiment, and can be applied to a wide range of uses such as connection between a storage device such as a hard disk drive built in an electronic device and a CPU.

The figure which shows one Example of the electronic device concerning this invention. The figure which shows another one Example of the electronic device concerning this invention. The block diagram which shows another one Example of the electronic device concerning this invention. The figure which explains in more detail the modulator and demodulator of Example 3 of the electronic device concerning this invention. FIG. 6 is a time chart detailing Embodiment 4 and Embodiment 5 of the electronic device according to the present invention. The block diagram of the principal part of the further another Example of the electronic device concerning this invention. The block diagram of the principal part of the further another Example of the electronic device concerning this invention. The block diagram of the principal part of the further another Example of the electronic device concerning this invention. The block diagram of other one Example of the superimposition circuit and isolation | separation circuit of an electronic device concerning this invention. The block diagram of the principal part of other one Example of the electronic device concerning this invention. FIG. 10 is a block diagram illustrating an electronic device having a conventional liquid crystal display body.

Explanation of symbols

107, 211, 330, 627, 723, 827, 1014, 1116:... Power line 115, 117, 214, 326, 613, 704, 828, 904, 1017, 1125:... Superimposing circuits 114, 118,. 215, 327, 622, 711, 829, 906, 1016, 1126: ... separation circuit 108, 211, 329, 626, 722, 826, 1015, 1119: ... radio propagation paths 301, 701, 501, 518 , 601, 718, 801:... CPU
302, 702, 502, 517, 602, 717, 802: ... Video memory 208, 303, 703, 503, 603, 803: ... Liquid crystal controller 102, 200, 308, 607, 705, 1004, 1109: ... modulators 110, 209, 310, 608, 707, 810, 1010, 1117: ... transmitting antennas 111, 210, 311, 609, 708, 811, 1011, 1118: ... receiving antennas 106, 202 314, 612, 712, 817, 1008, 1107: ... demodulator 805: ... primary modulator 807, 1103: ... diffusion modulator 206, 318: ... liquid crystal display 701: Image sensors 309, 315, 402, 408, 413, 420, 606, 615, 706, 715, 110 , 1106: ··· PLL
401, 405, 415, 419, 421: multipliers 414, 422: ... + 90 ° phase shifters 605, 616, 808, 816, 1121, 1122: ... spreading code generator 604: Code multiplexing circuit 614, 1108: ... despreading circuit 806, 813: ... pulse generator 809: ... pulse shaping circuit 814: ... correlator

Claims (13)

An information transmitter for modulating the first category information and transmitting it as an electromagnetic wave signal;
An information receiver for receiving and demodulating the electromagnetic wave signal;
A common power line for supplying power to the information transmitting unit and the information receiving unit;
A wired communication unit that performs communication by superimposing second category information on the power line between the information transmission unit and the information reception unit;
The electronic apparatus is characterized in that the connection of the wired communication unit is maintained and wired communication of the second category information is performed at least while wireless communication of the first category information is performed.   The electronic device according to claim 1, wherein the second category information is synchronization information related to wireless communication between the information transmitting unit and the information receiving unit.   The electronic device according to claim 1, wherein the second category information is carrier information of the information transmission unit.   The information transmission unit includes a control unit that generates a reference signal and a modulation unit that converts the first category information into an electromagnetic wave signal in synchronization with the reference signal, and the second category information transmitted and received by the wired communication unit. 3. The reference signal, wherein the information reception unit includes a demodulation unit that demodulates the first category information in synchronization with the reference signal received via the wired communication unit. The electronic device described.   The information transmission unit modulates a carrier wave emitted from the control unit for oscillating a reference signal, a first carrier wave oscillation unit for oscillating a carrier wave synchronized with the reference signal, and the carrier wave emitted from the carrier wave oscillation unit with the first category information, and converts the modulated signal into an electromagnetic wave signal. The second category information that includes a modulation unit and is transmitted / received via the wired communication unit is the reference signal, and the information reception unit is a carrier wave synchronized with the reference signal received via the wired communication unit 4. The electronic apparatus according to claim 3, further comprising: a second carrier oscillation unit that oscillates the first category information, and a demodulation unit that demodulates the first category information using a carrier wave generated by the second carrier oscillation unit.   The information transmission unit is configured to synchronize a control unit for oscillating a reference signal, a first carrier oscillation unit for oscillating a carrier wave synchronized with the reference signal, and a carrier wave generated by the carrier wave oscillation unit in synchronization with the reference signal using the first category information. A modulation unit that modulates and converts to an electromagnetic wave signal is provided, and the second category information transmitted / received via the wired communication unit is the reference signal, and the information receiving unit is received via the wired communication unit The first category information is synchronized with the reference signal received through the wired communication unit using a second carrier oscillation unit that oscillates a carrier wave synchronized with the reference signal and a carrier wave generated by the second carrier oscillation unit. 4. The electronic device according to claim 2, further comprising a demodulator that demodulates the electronic device.   The information transmission unit modulates the first category information by phase modulation, and the modulation / demodulation carrier information is generated from a reference signal transmitted by wire as the second category information and / or transmitted by the information transmission unit 6. The electronic apparatus according to claim 3, wherein the head of the packet is synchronized with a reference signal transmitted by wire as the second category information.   The information transmitting unit modulates the first category information by spread spectrum modulation, the information receiving unit despreads and demodulates the spectrum, and the modulation / demodulation spreading code synchronization information and / or carrier wave information is wired as the second category information. 6. The electronic apparatus according to claim 3, wherein the electronic apparatus is generated and synchronized with a reference signal to be transmitted.   The information transmitting unit modulates the first category information by UWB modulation, and synchronization information of a pulse template for demodulation is generated from a reference signal transmitted by wire as the second category information, and is synchronized. The electronic device according to claim 2.   A display unit, a storage unit that stores information to be displayed on the display unit, a display control unit that reads and outputs display information from the storage unit in accordance with a driving order of the display unit, and display information that is read by the control unit The electronic device having a display body driving unit for driving the display body based on the information, wherein information transmitted between the control unit and the display body driving unit is wirelessly transmitted as the first category information. Item 10. The electronic device according to any one of Items 1 to 9.   In an electronic device having an imaging device, an imaging control unit that reads and outputs an image signal from the imaging device, and a processing unit that receives and processes an output signal of the imaging control unit, between the imaging control unit and the processing unit 10. The electronic apparatus according to claim 1, wherein information to be transmitted is wirelessly transmitted as the first category information.   11. The electronic apparatus according to claim 1, wherein information transmitted between an electronic circuit on the integrated circuit and outside the integrated circuit is wirelessly transmitted as the first category information.   In an electronic device including a display unit, a speaker unit, image data to be displayed on the display unit, and a data source unit that generates acoustic data for driving the speaker unit, between the display unit or the speaker unit and the data source unit 11. The electronic apparatus according to claim 1, wherein the transmitted image data and sound data are wirelessly transmitted as the first category information.

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