JP2009134021A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus capable of preventing a load increase on a host device and capable of detecting a signal error. <P>SOLUTION: A display processing unit 30 includes: a high-speed serial interface circuit 31 which receives a packet from a main CPU 71 and outputs the received data; a driver circuit 32 which drives a display 21 based on the data output from the high-speed serial interface circuit 31; an error detecting section 33 which detects errors in the received data; a frame pulse signal generating section 34 which generates a frame pulse signal indicating a frame distance upon driving the display 21 by the driver circuit 32 and displaying an image on the display 21; and a frame pulse signal modulating section 35 which applies a predetermined modulation to the frame pulse signal when an error is detected by the error detection section 33; and a transmitting section 36 which transmits the modulated frame pulse signal to the main CPU 71. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic apparatus that displays an image on a display panel in accordance with a signal transmitted from a host device.

  The current portable terminal has an operation unit side case unit for performing key operations and a display unit side case unit provided with a main LCD (Liquid Crystal Display) for the purpose of improving design and functionality. Are connected via a coupling mechanism (hinge part), and the surface of the operation unit side body part and the surface of the display part side body part can be folded openably and closably. A slide type in which one housing is slid in one direction from the state in which the housing portion and the display portion side housing portion are overlaid, or the operation portion side housing portion and the display portion side housing portion are overlapped. There is a rotary type (turn type) in which one casing is rotated about an axis along the alignment direction.

  The operation unit side body has a circuit board on which a main CPU, which is a main control unit, is mounted. The display unit side body has a circuit board on which a driver circuit and the like for driving the main LCD and the like are mounted.

  In addition, the circuit board of the operation unit side body unit and the circuit board of the display unit side body unit are electrically connected by a plurality of signal wirings via the hinge unit. In recent years, high-speed serial communication has been used for communication from the main CPU to the main LCD.

  Here, since the hinge part is a part that is easily affected by electric noise such as static electricity, for example, a signal is sent from the main CPU of the operation unit side casing to the driver circuit that drives the main LCD of the display unit casing. When data is supplied via wiring, an error may occur due to the influence of noise.

  Conventionally, in order to avoid such an error, 1. A configuration in which the main CPU reads an error detection result stored in a register of a device mounted on the circuit board of the display unit side body (hereinafter referred to as a first configuration), or 2. A configuration in which the dedicated terminal of the circuit board of the display unit side body unit configured to change the polarity when an error occurs is returned to the main CPU, and an error is read by GPIO (general purpose input output) input (hereinafter, second) If an error is detected and data is retransmitted, a command is reset, etc., or simply whether the main CPU is released from sleep when waiting for an incoming call, etc., whether or not an error has occurred Regardless of whether the command is reset or the data is retransmitted at regular intervals.

Japanese Patent Laid-Open No. 2004-26883 discloses whether an image signal is transmitted at that time by changing a vertical synchronization signal or a horizontal synchronization signal output from the control unit to the display unit at the same time as the separation of image data and command data. A technique has been proposed in which the display unit side recognizes whether the data is command data, and only the command data is subjected to error detection.
JP 2000-250526 A

  However, in the first configuration in which the main CPU reads the error detection result to the register on the circuit board of the display unit side body unit, the load on the main CPU increases, and This leads to an increase in current consumption.

  In the case of the second configuration in which the dedicated terminal is connected to the main CPU, the number of signal wires passing through the hinge portion and the number of connector pins are increased, and thus an increase in cost is inevitable.

  Further, according to Patent Document 1, a technique for separating an image signal and command data by a synchronization signal transmitted from the host side (main CPU) to the client side (main LCD), which increases the load on the main CPU, It is difficult to avoid the accompanying increase in current consumption.

  The present invention has been made in view of the above-described problems, and one of its purposes is to suppress the increase in signal load without increasing the signal wiring while suppressing an increase in load and current consumption of the host device. An object is to provide an electronic device capable of detecting an error.

  In order to solve the above problems, an electronic device according to the present invention includes an interface unit that receives data from a host device via a signal line, and a drive that drives a display panel based on the data output from the interface unit. Means, error detection means for detecting an error in the received data, and frame pulse signal generation means for generating a frame pulse signal indicating a frame interval when an image is displayed on the display panel by driving the driving means A frame pulse signal modulating means for performing predetermined modulation on the frame pulse signal when an error is detected by the error detecting means, and a frame pulse signal modulated by the frame pulse signal modulating means to the host device. Transmitting means for transmitting.

  In the electronic apparatus, it is preferable that the host device retransmits data to the interface unit when a predetermined modulation is performed on the frame pulse signal transmitted from the transmission unit.

  In the electronic device, the host device supplies the interface unit with a command for returning the modulated frame pulse signal to a normal frame pulse signal after retransmitting data to the interface unit. Preferably transmits an unmodulated frame pulse signal to the host device.

  In the electronic apparatus, it is preferable that the frame pulse signal modulating unit modulates a pulse width of the frame pulse signal when an error is detected by the error detecting unit.

  In the electronic apparatus, it is preferable that the frame pulse signal modulation unit modulates the frequency of the frame pulse signal when an error is detected by the error detection unit.

  In the electronic apparatus, it is preferable that the host device detects a frame pulse signal transmitted from the transmission unit at a predetermined cycle.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic device which can detect the error of a signal without accompanying the increase in a signal wiring can be provided, suppressing the increase in the load of a host device, and the increase in current consumption.

  Embodiments of the present invention will be described below. FIG. 1 is an external perspective view of a mobile phone device 1 which is an example of an electronic apparatus according to the present invention. In the following, the cellular phone device will be described. However, the present invention is not limited to this, and any device having an imaging function and a communication function may be used. For example, PHS (Personal Handy phone System), PDA ( (Personal Digital Assistant), portable navigation device, notebook personal computer or the like.

  The mobile phone device 1 includes an operation unit side body unit 2 and a display unit side body unit 3. The operation unit side body unit 2 includes an operation key group 11 and a microphone 12 into which a voice uttered by a user of the mobile phone device 1 is input on the surface unit 10. The operation key group 11 includes a function setting operation button 13 for operating various functions such as various settings, a telephone book function, and a mail function, and an input operation button 14 for inputting a telephone number and characters such as mail. And a determination operation button 15 for performing determination and scrolling in various operations.

  Further, the display unit side body unit 3 has a display 21 for displaying various information on the surface unit 20, an audio output unit 22 for outputting the voice of the other party on the call, and a CCD (Charge Coupled) for imaging the subject. (Device) An image pickup unit 23 constituted by a camera or the like and a speaker 24 for outputting music or the like to the outside are provided.

  In addition, since the image capturing unit 23 has an image capturing direction perpendicular to the display surface of the surface unit 20, the image capturing unit 23 captures an image when a person who holds and operates the mobile phone device 1 views the display 21 from the front. The direction is oriented in the direction in which the person's face is located. The imaging unit 23 may be provided on the surface portion 10 of the operation unit side body 2 instead of being provided on the display unit side body 3. In such a case, the imaging direction of the imaging unit 23 is also provided. The mobile phone device 1 may be held in the direction in which the face of the person who operates it is positioned. In the present embodiment, the imaging unit 23 is not an essential configuration, and may be the mobile phone device 1 that does not include the imaging unit 23. Further, the imaging direction of the imaging unit 23 is not particularly limited, and may be any direction such as inward or outward.

  Further, the upper end of the operation unit side body 2 and the lower end of the display unit side body 3 are connected via a hinge mechanism 4. In addition, the cellular phone device 1 relatively rotates the operation unit side body unit 2 and the display unit side body unit 3 connected via the hinge mechanism 4, thereby The display unit side body 3 can be in a state of being open to each other (open state), or the operation unit side body 2 and the display unit side body 3 can be in a folded state (folded state).

  1 shows a form of a so-called foldable mobile phone device, but the form of the mobile phone device according to the present invention is not particularly limited to this, and the operation unit side body unit 2 and the display unit side body unit are not limited thereto. A slide type in which one housing is slid in one direction from a state in which the body portion 3 is overlaid, and an axis line along the overlapping direction of the operation portion side housing portion 2 and the display portion side housing portion 3 A rotary type (turn type) in which one casing is rotated around the center, and the operation section side casing section 2 and the display section side casing section 3 are arranged in one casing and have a connecting portion. There may be no type (straight type).

  FIG. 2 is a functional block diagram showing functions of the mobile phone device 1. As shown in FIG. 2, the mobile phone device 1 includes a display 21 that displays predetermined information, an imaging unit 23 that images a subject, and a display processing unit 30 that performs predetermined processing when displaying an image on the display 21. And a speaker 24 that outputs sound to the outside, a communication unit 60 that communicates with an external terminal, a processing unit 70 that performs predetermined processing, a rechargeable battery 80 having a predetermined capacity, and a rechargeable battery 80. A power supply circuit unit 90 that converts a power supply voltage to a predetermined voltage and supplies the converted voltage to the communication unit 60, the processing unit 70, and the like, and a mounting unit 101 to which the external memory 100 is mounted are provided.

  The communication unit 60 includes a main antenna 61 that communicates with an external device using a predetermined use frequency band, and a communication processing unit 62 that performs signal processing such as modulation processing or demodulation processing.

  The main antenna 61 communicates with an external device (base station) in a predetermined use frequency band (for example, 800 MHz). In the present embodiment, the predetermined use frequency band is 800 MHz, but other frequency bands may be used. Further, the main antenna 61 may have a so-called dual band compatible type that can support a second use frequency band (for example, 2 GHz) in addition to a predetermined use frequency band. You may be comprised by the multiple band corresponding | compatible type | mold which can respond | correspond to the use frequency band or more.

  The communication processing unit 62 demodulates the signal received by the main antenna 61, supplies the processed signal to the processing unit 70, and modulates the signal supplied from the processing unit 70, via the main antenna 61. To the external device (base station).

  The power supply circuit unit 90 transforms the power supply voltage supplied from the rechargeable battery 80 to a predetermined voltage value, and supplies the power supply voltage after the transformation to the communication unit 60, the processing unit 70, and the like.

  The mounting unit 101 has a shape conforming to a predetermined standard, and enables mounting of the nonvolatile external memory 100 conforming to the predetermined standard. Further, the processing unit 70 writes data to the external memory 100 attached to the attachment unit 101, and reads the written data.

  In the present embodiment, the external memory 100 is configured with a plurality of folders (directories), and the folder stored according to the type of stored data is described as being different. It is not done.

  The external memory 100 will be described as being managed by, for example, FAT (file allocation table), but is not limited to this.

  Further, the processing unit 70 includes a main CPU 71. The main CPU 71 has a high-speed serial interface conforming to the serial interface standard for performing data transmission between the display processing unit 30 and the imaging unit 23. For example, when transmitting a moving image, Efficient transmission such as transmitting only differential data can be performed, and power consumption can be reduced.

  Here, the configuration and operation of the display processing unit 30 and the display 21 will be described in detail. As shown in FIG. 3, the display processing unit 30 receives a packet from the main CPU 71 (host device) built in the processing unit 70 via the high-speed serial bus A, and the command or image data included in the received packet. , A driver circuit 32 (driving means) for driving the display 21 (display panel) based on the command or image data output from the high-speed serial interface circuit 31, and an error in the received packet An error detection unit 33 (error detection means) that performs detection, and a frame pulse signal generation unit 34 (frame pulse signal that generates a frame pulse signal indicating a frame interval when an image is displayed on the display 21 by driving the driver circuit 32. Generating means) and the error detection unit 33 When a signal is detected, a frame pulse signal modulation unit 35 (frame pulse signal modulation means) that performs predetermined modulation on the frame pulse signal and a frame pulse signal modulated by the frame pulse signal modulation unit 35 are transmitted to the main CPU 71. A transmission unit 36 (transmission means). The display processing unit 30 is provided with an image RAM (hereinafter also simply referred to as VRAM) 37.

  The high-speed serial bus A includes a data line A1 (not shown) through which data is transmitted from the main CPU 71 to the high-speed serial interface circuit 31 and a clock line A2 (not shown) through which a clock signal is transmitted. The transmission unit 36 and the main CPU 71 are connected by a frame pulse signal line B.

  Here, display control of the display 21 will be described. When the display processing unit 30 includes the VRAM 37 as in the present invention, the main CPU 71 writes image data into the VRAM 37 via the high-speed serial interface circuit 31. The display processing unit 30 reads the data written in the VRAM 37 at a predetermined timing and outputs it to the display 21. Here, if there is a difference between the speed at which image data is written from the main CPU 71 to the VRAM 37 and the speed at which image data is read from the VRAM 37, a phenomenon (tiering) in which an image displayed on the display 21 is vertically shifted occurs. .

  In order to prevent this tearing, the display processing unit 30 reads data from the VRAM 37, and the frame pulse signal generation unit 34 generates a vertical synchronization signal (frame pulse signal) indicating the timing for displaying an image for one frame on the display 21. The data is generated and output from the transmission unit 36 to the main CPU 71 via the frame pulse signal line B. Note that the frame pulse signal generation unit 34 may generate a pulse signal obtained by slightly shifting the timing of the vertical synchronization signal as a frame pulse signal.

  The main CPU 71 also prevents tearing by timing image data transfer based on the frame pulse signal supplied from the display processing unit 30 and transmitting the image data to the display processing unit 30. .

  Further, in the present invention, when an error is detected in the packet received by the error detection unit 33, the frame pulse signal modulation unit 35 performs predetermined modulation on the frame pulse signal, and after the modulation via the frame pulse signal line B, This frame pulse signal is notified to the main CPU 71.

  Here, the operation of the display processing unit 30 will be described with reference to the flowchart shown in FIG.

  In step S <b> 1, the display processing unit 30 determines whether the packet supplied from the main CPU 71 via the high-speed serial interface circuit 31 has an error by the error detection unit 33. If it is determined that there is an error in the packet, the process proceeds to step S2.

  In step S <b> 2, the display processing unit 30 modulates the frame pulse signal by the frame pulse signal modulation unit 35.

  In step S <b> 3, the display processing unit 30 transmits the frame pulse signal modulated in the step S <b> 2 to the main CPU 71 by the transmission unit 36.

  Further, when the error detection unit 33 detects an error in parameters (setting values such as luminance and display position) when displaying an image on the display 21, the display processing unit 30 discards the setting values. The driver circuit 32 may be controlled.

  The main CPU 71 retransmits a command or data to the high-speed serial interface circuit 31 via the high-speed serial bus A when the frame pulse signal transmitted from the transmission unit 36 is subjected to predetermined modulation. According to such a configuration, it is not necessary to separately provide an error detection signal line, and an increase in load and current consumption of the main CPU 71 are suppressed, and packet errors are effectively notified to the main CPU 71. The command can be reset and the data can be retransmitted.

  Further, the main CPU 71, for example, goes to monitor the frame pulse signal at a timing synchronized with a standby interval (for example, several msec interval) when the mobile phone device 1 is waiting for reception, and performs predetermined modulation on the frame pulse signal. If the error has occurred, the occurrence of an error is detected, and the display setting value command or image data is retransmitted to the high-speed serial interface circuit 31 via the high-speed serial bus A to recover the display image. According to such a configuration, the monitoring burden on the main CPU 71 can be reduced. Even when a burst error occurs, an increase in interrupts can be prevented and the burden on the main CPU 71 can be reduced.

  Also, the main CPU 71 retransmits the command or data by a packet to the high-speed serial interface circuit 31, and then supplies a command for returning the modulated frame pulse signal to the normal frame pulse signal to the high-speed serial interface circuit 31. To do. The transmission unit 36 releases the modulated frame pulse signal based on the command to return to the normal frame pulse signal, and transmits the unmodulated frame pulse signal to the main CPU 71.

  Specifically, when an error is detected in the packet by the error detection unit 33, writing to the error register is performed. The frame pulse signal modulation unit 35 performs predetermined modulation on the frame pulse signal when data is written in the error register.

  Further, when a command for returning to a normal frame pulse is supplied from the main CPU 71, the display processing unit 30 clears writing in the error register. The frame pulse signal modulator 35 confirms that the error register write has been cleared, and ends the operation of performing predetermined modulation on the frame pulse signal. After the error register write is cleared, the transmitter 36 supplies a normal frame pulse signal to the main CPU 71.

  Here, the operation of the main CPU 71 described above will be described with reference to the flowchart shown in FIG. The display 21 is assumed to be lit.

  In step S11, the main CPU 71 polls the error detection signal. Here, polling is a method in which when a cooperative operation is performed with a plurality of components, the system asks each component whether there is a transmission request or a processing request.

  In step S12, the main CPU 71 determines whether an error has been detected. The main CPU 71 confirms the frame pulse signal transmitted from the display processing unit 30 at a predetermined timing (for example, timing synchronized with a standby interval (for example, several msec interval) when the mobile phone device 1 is waiting for reception) It is determined whether or not an error detection signal is included in the frame pulse signal. If it is determined that the error detection signal is included, the process proceeds to step S13. If it is determined that the error detection signal is not included, the process ends.

  In step S13, the main CPU 71 retransmits the display setting value reset command and the image data.

  Here, a specific modulation example of the frame pulse signal by the frame pulse signal modulation unit 35 will be described. 6A shows a waveform diagram of a basic frame pulse signal, FIG. 6B shows a waveform diagram of a frame pulse signal after modulation by the first modulation method, and FIG. c) and (d) show waveform diagrams of the frame pulse signal after modulation by the second modulation method.

  For example, as shown in FIG. 6B, the frame pulse signal modulation unit 35 modulates the pulse width of the frame pulse signal when an error is detected by the error detection unit 33. The pulse width may be wider or narrower than the basic frame pulse signal.

  Further, as shown in FIGS. 6C and 6D, the frame pulse signal modulation unit 35 modulates the frequency of the frame pulse signal when an error is detected by the error detection unit 33. The frequency may be higher than the frequency of the basic frame pulse signal (FIG. 6C) or may be a lower frequency (FIG. 6D).

  Thus, in the cellular phone device 1 according to the present invention, when the error detection unit 33 detects an error in the packet, the frame pulse signal is subjected to predetermined modulation, and the modulated frame pulse signal is converted into the frame pulse. Since the main CPU 71 supplies the signal to the main CPU 71 via the signal line B and the command is reset and the data is retransmitted from the main CPU 71, there is no need to provide a separate signal line for error detection. An increase in current consumption can be suppressed, packet errors can be notified to the main CPU 71 efficiently, and command resetting and data retransmission can be performed.

It is a perspective view which shows the external appearance of the mobile telephone apparatus which concerns on this invention. It is a block diagram which shows the function of the mobile telephone apparatus which concerns on this invention. It is a block diagram which shows the function of the display process part with which the mobile telephone apparatus which concerns on this invention is equipped. It is a flowchart with which it uses for description about operation | movement of a display process part. It is a flowchart with which it uses for description about operation | movement of main CPU. It is a wave form diagram which shows a mode when a frame pulse signal is modulated by the frame pulse signal modulation part.

Explanation of symbols

1 Mobile phone device 21 Display (display panel)
30 Display processing unit 31 High-speed serial interface circuit 32 Driver circuit (driving means)
33 Error detection unit (error detection means)
34 Frame pulse signal generator (frame pulse signal generator)
35 Frame pulse signal modulation section (frame pulse signal modulation means)
36 Transmitter (Transmission means)
37 Image RAM
70 Processing Unit 71 Main CPU (Host Device)
A High-speed serial bus B Frame pulse signal line

Claims (6)

Interface means for receiving data from a host device via a signal line;
Driving means for driving the display panel based on the data output from the interface means;
Error detection means for performing error detection of the received data;
Frame pulse signal generating means for generating a frame pulse signal indicating a frame interval when an image is displayed on the display panel by driving the driving means;
Frame pulse signal modulating means for performing predetermined modulation on the frame pulse signal when an error is detected by the error detecting means;
An electronic apparatus comprising: transmission means for transmitting a frame pulse signal modulated by the frame pulse signal modulation means to the host device.   2. The electronic apparatus according to claim 1, wherein the host device retransmits data to the interface unit when predetermined modulation is performed on the frame pulse signal transmitted from the transmission unit. The host device, after retransmitting data to the interface means, supplies a command for returning the modulated frame pulse signal to a normal frame pulse signal to the interface means,
3. The electronic apparatus according to claim 2, wherein the transmission unit transmits an unmodulated frame pulse signal to the host device.   2. The electronic apparatus according to claim 1, wherein the frame pulse signal modulation unit modulates a pulse width of the frame pulse signal when an error is detected by the error detection unit.   2. The electronic apparatus according to claim 1, wherein the frame pulse signal modulation means modulates the frequency of the frame pulse signal when an error is detected by the error detection means.   4. The electronic apparatus according to claim 1, wherein the host device detects a frame pulse signal transmitted from the transmission unit at a predetermined cycle.

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