JP5124935B2 - Control device, display system, control method, etc. - Google Patents

Description

  The present invention provides a display device including a display element that displays an image when a driving voltage is applied and holds the display state of the image even after the application of the driving voltage is stopped, and controls the driving voltage for the display device. The present invention relates to a technical field such as a control device that outputs a control signal for output based on input image data, an output device that outputs the image data, a display system, and a control method.

  In recent years, an image to be displayed is rewritten with an electric signal, and the display state is maintained even after the power is turned off (having a memory property), a so-called display device called electronic paper (for example, a twisting ball display, a microcapsule type) Research and development for practical application of electrophoretic display, toner display, electronic fluid separation display, cholesteric liquid crystal display, etc. are actively conducted.

  Such a display device (hereinafter also referred to as a “display device having a memory property”) is in comparison with a conventional display device having no memory property (for example, a CRT (Cubed Ray Tube) display, a plasma display, a nematic liquid crystal display, etc.). Although the drawing speed (the rewriting speed of the display image) is slow, as described above, it is possible to keep the display state even after the power is turned off, and it can be manufactured as thin as paper. Therefore, it is easy to carry.

For example, as disclosed in Patent Document 1, a display device having no memory function is used as a main display, and a display device having a memory function is used as a sub display. Normal work such as application program operation using a terminal device such as a PC (Personal computer) provided as a display is performed while checking the main display, and the work results and status displayed on the main display are printed on paper. Thus, a display system has been proposed in which the result is displayed on the sub-display and the result can be confirmed on the sub-display even when the display content of the main display is changed.
JP 2000-284253 A

  However, a conventional display device having memory characteristics stores image data for one screen output from a terminal device or the like in the frame memory, and then stores the image data from the frame memory at a timing according to the drawing speed of the display device. There is a problem that the cost performance is poor because the display processing utilizing the frame memory is not performed even though the drawing speed is low, such as reading out one line at a time and rewriting the display image.

  In addition, in a conventional display system using a display device having a memory property, it is not assumed that the sub display is frequently detached and attached from the terminal device. Since it is exposed, antifouling measures are required, and there is a risk that the connection terminal will be worn or damaged by frequent removal. On the other hand, if it is configured to send image data to the sub-display using technology such as Bluetooth or wireless LAN (Local Area Network) in order to perform contactless connection, communication components become expensive, There is a problem that the cost increases as a plurality of sub-displays are used.

The present invention has been made in view of the above points, and an object thereof is to provide a control device, a display system, a display device, an output device, a control method, and the like that can reduce costs. The control apparatus capable of contactless connections while keeping costs, and to provide a display system 及 beauty control method and the like.

In order to solve the above-mentioned problem, the invention according to claim 1 is a display including a display element that displays an image when a driving voltage is applied and maintains a display state of the image even after the application of the driving voltage is stopped. A control device for outputting a control signal for controlling the drive voltage to the device based on input image data, wherein the image data of each pixel line constituting one screen is one pixel by the display device. Each time the image data for a predetermined number of pixel lines smaller than the number of pixel lines constituting one screen is input by sequentially inputting in a cycle shorter than the time required for writing pixels for lines. the display device regardless of whether data is being written in the pixels, and the image data storage means for storing input image data of the pixel line of the predetermined number of the control signal The but stored in the first determining means for determining whether or not the writing time has passed required from the output of the write of the predetermined number of pixel lines of the pixel by the display device, the image data storage means Display position detecting means for detecting a position where an image composed of image data for a predetermined number of pixel lines is displayed by the display device, and the control signal for displaying the image at the detected display position is output. Second determination means for determining whether or not the image has been completed, and the first determination means determines that the writing time has elapsed since the output of the control signal, and an image is displayed at the detected display position. said control when the signal is determined by the free and the second judging means is already output, the predetermined number of pixels La stored in the image data storage means at that time to display a Based on the emission of image data, it an image made by the image data, which Ru and a control signal output means for outputting the control signal for displaying by the display device to the detected display position It is characterized by.

According to the present invention, the controller may store the image data of the predetermined number of pixel line in every image data input at a predetermined frame frequency is inputted a predetermined number of pixel line, stored images A display position of an image constituted by data is detected. In addition, the control device determines that the writing time required for writing pixels for a predetermined number of pixel lines by the display device has elapsed since the output of the control signal, and the control signal for the detected display position is If it is determined that not already been output, based on the image data of a predetermined number of pixel line that is stored at that time, and outputs a control signal so that the image is displayed in the table shown position. In this way, when control signals are output one after another, image display for one screen is completed. Accordingly, a display device can be manufactured using an inexpensive memory such as a line memory, and the cost can be reduced. In addition, since the control signal is prevented from being output again for the display position where the control signal has been output once, the image display process can be performed efficiently.

  Invention of Claim 2 is a display system provided with the control apparatus and display apparatus of Claim 1, and the output device which outputs the said image data, Comprising: The said output device is the said output image. Image data transmitting means for transmitting data to the control device by electromagnetic induction, wherein the control device receives the image data transmitted by the output device by electromagnetic induction, and inputs the image data. Is further provided.

  According to the present invention, since image data is transmitted by electromagnetic induction between the output device and the control device, contactless connection can be performed while suppressing the cost of communication components.

Invention of Claim 3 is a display system provided with the control apparatus and display apparatus of Claim 1, Comprising: The said control apparatus is a control which transmits the said output control signal to the said display apparatus by electromagnetic induction further comprising a signal transmitting means, said display apparatus further comprising a control signal receiving means for receiving a control signal transmitted Ri by the said control device with an electromagnetic induction.

  According to the present invention, since the control signal is transmitted by electromagnetic induction between the control device and the display device, it is possible to perform contactless connection while reducing the cost of the communication component and output the control signal. Since it is not necessary to incorporate a circuit or the like in the display device, the cost of the display device can be reduced.

  The invention according to claim 4 is a display system comprising the control device according to claim 1 and a display device, wherein the control device is applied to the display element of the display device based on the output control signal. Drive signal output means for outputting a drive signal corresponding to the drive voltage to be applied, and drive signal transmission means for transmitting the output drive signal to the display device by electromagnetic induction, the display device, The apparatus further comprises drive signal receiving means for receiving the drive signal transmitted by the control device by electromagnetic induction.

  According to the present invention, since the control signal is transmitted by electromagnetic induction between the control device and the display device, it is possible to perform contactless connection while reducing the cost of the communication component and output the control signal. Since it is not necessary to incorporate a circuit, a circuit for outputting a drive signal, or the like into the display device, the cost of the display device can be reduced.

According to a fifth aspect of the present invention, in the display system according to any one of the second to fourth aspects, the display device includes a plurality of scanning lines arranged on the display element so as to intersect with each other. It further has a plurality of data lines, and the drive voltage is applied to the power supply terminals at both ends of at least one of the scanning lines and the data lines by electrostatic coupling.

  According to the present invention, the number of drivers and the like for applying a driving voltage to the scanning lines and the data lines can be reduced, so that the cost of the display device can be further reduced.

The invention according to claim 6 is a control device included in the display system according to any one of claims 2 to 5 , wherein the image data storage means, the first determination means, and the display position detection means. The second determination unit and the control signal output unit are provided.

According to a seventh aspect of the present invention , a computer included in the control device according to the first or sixth aspect is caused to function as the first determination unit, the second determination unit, and the control signal output unit. And

The invention according to claim 8 displays an image by applying a drive voltage, and applies the drive voltage to a display device including a display element that maintains a display state of the image even after the application of the drive voltage is stopped. A control method in a control device that outputs a control signal for control based on input image data, wherein the image data of each pixel line constituting one screen is a pixel of one pixel line by the display device. Each time the image data for a predetermined number of pixel lines smaller than the number of pixel lines constituting one screen is input by sequentially inputting in a cycle shorter than the time required for writing, the display device regardless of whether data is being written in the pixel, the input image data of the pixel line of the predetermined number of, picture for storing image data of the pixel line of the predetermined number A storage control step of storing in the data storage means, first determines whether the control signal is required for writing the predetermined number of pixel lines of the pixel by the display device from the output writing time has elapsed 1 A determining step; a display position detecting step for detecting a position where an image composed of image data for the predetermined number of pixel lines stored in the image data storage means is displayed by the display device; and the detected A second determination step for determining whether or not the control signal for displaying an image at a display position has been output; and the first determination step when the writing time has elapsed since the control signal was output. And when it is determined in the second determination step that the control signal for displaying an image at the detected display position has not been output, Said image data storage means based on the image data of the pixel line of the predetermined number stored in the for displaying an image made by the image data, by the display device to the detected display position characterized in that it comprises a control signal output step of outputting a control signal.

According to a ninth aspect of the present invention, there is provided a display device including a display element that displays an image when a driving voltage is applied and maintains an image display state even after the application of the driving voltage is stopped. A control method in a display system comprising: a control device that outputs a control signal for controlling the drive voltage based on input image data; and an output device that outputs the image data, the output device The image data transmitting step of transmitting the output image data to the control device by electromagnetic induction, and the control device receiving the image data transmitted by the output device by electromagnetic induction an image data reception step of inputting, the control device, writing of the image data for one pixel line by the display device pixel for each pixel line constituting the one screen By coming sequentially inputted in cycles shorter than the time required for write, each time the image data of a predetermined number of pixel line less than the number of pixel lines constituting one screen is input, the display device regardless of whether data is being written in the pixel, the input image data of the pixel line of the predetermined number of the storage control to be stored in the image data storage means for storing image data of the pixel line of the predetermined number And a first determination step in which the control device determines whether or not a writing time required for writing the pixels of the predetermined number of pixel lines by the display device has elapsed since the output of the control signal. , it detects the position of said control device, said image data storage means in the image constituted by the stored image data of the pixel line of the predetermined number of are displayed by the display device The display position detecting step you, the control device, a second determination step of determining the control signal whether already been output for displaying an image on the detected display position, the control device In the first determination step, it is determined that the writing time has elapsed since the control signal was output, and the control signal for displaying an image at the detected display position has not been output. When it is determined in the second determination step, an image constituted by the image data is detected based on the image data for the predetermined number of pixel lines stored in the image data storage unit at that time. a control signal output step of outputting the control signal for displaying by the display device in the display position, characterized in that it comprises a.

According to a tenth aspect of the present invention, there is provided a display device including a display element that displays an image when a driving voltage is applied and maintains an image display state even after the application of the driving voltage is stopped. And a control device that outputs a control signal for controlling the drive voltage based on the input image data, wherein the control device includes each pixel line constituting one screen. Are sequentially input at a cycle shorter than the time required for writing pixels for one pixel line by the display device, so that a predetermined number of pixel lines smaller than the number of pixel lines constituting one screen is obtained. every time the minute of the image data is input, the display device regardless of whether data is being written in the pixels, the input the predetermined number of pixel lines of an image The chromatography data, a storage control step of storing the image data storage means for storing image data of the pixel line of the predetermined number, the control device, from the control signal is output in the predetermined number by the display device a first determination step of determining whether the writing time has elapsed required for writing pixel pixel line, wherein the controller, the image data storage means stored the predetermined number of pixel lines of an image A display position detecting step for detecting a position where an image composed of data is displayed by the display device, and the control signal for causing the control device to display an image at the detected display position has already been output. A second determination step of determining whether or not the control device determines in the first determination step that the writing time has elapsed since the output of the control signal; and If the issued display the control signal for displaying the image at the position is determined in absence and the second determination process is already output, the predetermined number of pixels stored in said image data storage means at that time based on the image data for one line, the image formed by the image data, a control signal output step of outputting the control signal for displaying by the display device on the detected display position, the control device a control signal transmitting step of transmitting said output control signal to the display device by the electromagnetic induction, wherein the display device includes a control signal reception step of receiving a control signal transmitted Ri by the said control device by an electromagnetic induction , Including .

According to an eleventh aspect of the present invention, there is provided a display device including a display element that displays an image when a driving voltage is applied and maintains an image display state even after the application of the driving voltage is stopped. And a control device that outputs a control signal for controlling the drive voltage based on the input image data, wherein the control device includes each pixel line constituting one screen. Are sequentially input at a cycle shorter than the time required for writing pixels for one pixel line by the display device, so that a predetermined number of pixel lines smaller than the number of pixel lines constituting one screen is obtained. every time the minute of the image data is input, the display device regardless of whether data is being written in the pixels, the input the predetermined number of pixel lines of an image The chromatography data, a storage control step of storing the image data storage means for storing image data of the pixel line of the predetermined number, the control device, from the control signal is output in the predetermined number by the display device a first determination step of determining whether the writing time has elapsed required for writing pixel pixel line, wherein the controller, the image data storage means stored the predetermined number of pixel lines of an image A display position detecting step for detecting a position where an image composed of data is displayed by the display device, and the control signal for causing the control device to display an image at the detected display position has already been output. A second determination step of determining whether or not the control device determines in the first determination step that the writing time has elapsed since the output of the control signal; and If the issued display the control signal for displaying the image at the position is determined in absence and the second determination process is already output, the predetermined number of pixels stored in said image data storage means at that time based on the image data for one line, the image formed by the image data, a control signal output step of outputting the control signal for displaying by the display device on the detected display position, the control device , based on the output control signal, a driving signal output step of outputting a driving signal corresponding to the driving voltage to be applied to the display element of the display device, the control device, wherein the driving signal output Drive signal transmitting step for transmitting the electromagnetic wave to the display device, and the display device for receiving the drive signal transmitted by the control device by electromagnetic induction Characterized by comprising a receiving step.

According to the present invention, the controller may store the image data of the predetermined number of pixel line in every image data input at a predetermined frame frequency is inputted pixel line of a predetermined number, the stored image A display position of an image constituted by data is detected. In addition, the control device determines that the writing time required for writing pixels for a predetermined number of pixel lines by the display device has elapsed since the output of the control signal, and the control signal for the detected display position is If it is determined that not already been output, based on the image data of a predetermined number of pixel line that is stored at that time, and outputs a control signal so that the image is displayed in the table shown position. In this way, when control signals are output one after another, image display for one screen is completed. Accordingly, a display device can be manufactured using an inexpensive memory such as a line memory, and the cost can be reduced. In addition, since the control signal is prevented from being output again for the display position where the control signal has been output once, the image display process can be performed efficiently.

  In addition, according to the present invention, image data or the like is transmitted by electromagnetic induction between the output device and the control device, or between the control device and the display device. Connection can be made.

Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings. The embodiment described below is an embodiment when the present invention is applied to an information display system configured to include a display device having a memory property and a display device having no memory property. is there.
[1. First Embodiment]
[1.1 Overview of information display system configuration and functions]
First, the configuration and function of the information display system S according to the present embodiment will be described with reference to FIG.

  FIG. 1 is a diagram illustrating an example of a schematic configuration of the information display system S.

  As shown in FIG. 1, the information display system S includes a terminal device 10, a main display 20, an I / F (Interface) terminal 30 as an output device, and a sub display 40 as a control device and a display device. It is configured to include.

  The main display 20 is a display device having no memory property such as CRT, plasma, nematic liquid crystal, and the like. For example, a PC display, a television receiver, and the like are applicable.

  The terminal device 10 and the main display 20 are connected by a display cable K1, and the main display 20 inputs image data output from the terminal device 10 as analog RGB signals via the display cable K1. An image is displayed based on the image data.

  Further, the terminal device 10 and the I / F terminal 30 are connected by a display cable K2, and image data output from the terminal device 10 as an analog RGB signal is transmitted via the display cable K2 to the I / F terminal 30. Is to enter.

  The image data input by the I / F terminal 30 is transmitted to the sub display 40 by electromagnetic induction, and the sub display 40 displays an image based on the image data.

  Further, the terminal device 10 and the I / F terminal 30 are connected by a control cable K3, and the I / F terminal 30 transmits a display instruction signal output from the terminal device 10 via the control cable K3. Based on the display instruction signal, whether or not to transmit the image data input via the display cable K2 to the sub display 40 is controlled. As the control cable K3, for example, a USB (Universal Serial Bus) cable, an RS-232C (Recommended Standard 232 C) cable, or the like is applicable.

  In the present information display system S, an image corresponding to the operation of the terminal device 10 by the user is displayed on the main display 20, and the terminal device 10 to the I / F terminal 30 by the operation of the terminal device 10 by the user. When the display instruction signal is output, the image data is transmitted from the I / F terminal 30 to the sub-display 40, so that the image displayed on the main display 20 at that time (the image output from the terminal device 10). The image based on the data) is displayed on the sub display 40.

Note that the information display system S may include a plurality of sub-displays 40.
[1.2 Overview of terminal device configuration and functions]
Next, the configuration and outline function of the terminal device 10 will be described.

  As the terminal device 10, for example, a PC, an STB (Set Top Box), or the like is applicable.

  The terminal device 10 includes a control unit configured by a CPU (Central Processing Unit) having a calculation function, a working RAM (Random-Access Memory), a ROM (Read-Only Memory), and various programs (for example, an OS (Operating System)). System), driver programs, application software, etc.) and storage units for storing various data (for example, HDD (Hard Disc Drive), EEPROM (ElectriCally Erasable Programmable Read Only Memory), etc.), and input operation instructions from the user An operation unit (for example, a keyboard, a mouse, an operation panel) and a display control unit (for example, a graphic controller) that outputs image data as analog RGB signals are provided. The control unit and each unit are connected by a system bus. ing.

  The display control unit includes, for example, a RAM DAC (RAM Digital / Analog Converter) and a graphic memory. Image data written in the graphic memory as digital data when the control unit executes a display driver program or the like is used. The RAMDAC reads out one row at a predetermined cycle (for the number of pixels in the horizontal direction of one screen), converts it into an analog RGB signal, and outputs it to the main display 20 and the sub display 40 via the display cables K1 and K2. It has become. The analog RGB signal output from the display control unit includes signals of + 5V, GND (ground), vertical synchronization, horizontal synchronization, DDC (Display Data Channel) data, data clock, etc. in addition to RGB color output. ing.

  In addition, the control unit controls and controls the terminal device 10 by the CPU reading and executing various programs stored in the ROM or the storage unit, and also operates the operation unit by the user (for example, pressing a predetermined key ( When a signal for instructing display on the sub-display is input by, for example, selecting a predetermined menu on the screen by operating the mouse), a display instruction signal is output to the I / F terminal 30 via the control cable K3. It is supposed to be.

  In addition, the storage unit stores in advance information on the resolution (the number of display pixels in the horizontal direction and the number of display pixels in the vertical direction) of the main display 20 and the sub display 40, and the control unit reads out the resolutions, When the resolution of the display 40 is lower than the resolution of the main display 20 (the number of pixels in the horizontal direction or the vertical direction is small), when outputting a display instruction signal, which region of the image displayed on the main display 20 is sub The display control unit is controlled so that an area frame for determining whether or not to display on the display 40 is displayed on the main display 20. When an area is designated by the operation of the operation unit by the user, the coordinate data of the area is output to the display control unit. Then, the display control unit outputs image data for all areas (all pixels) written in the graphic memory to the main display, and to the sub display 40, the area specified by the user. Only image data is output.

The various programs may be downloaded from a predetermined server, for example, or may be recorded on a recording medium such as a CD-ROM and read via a drive.
[1.3 I / F terminal configuration and function overview]
Next, the configuration and functional overview of the I / F terminal 30 will be described with reference to FIG.

  FIG. 2 is a block diagram illustrating an example of a schematic configuration of the I / F terminal 30 according to the second embodiment.

  As shown in FIG. 2, the I / F terminal 30 includes a monitor unit 31, an output control unit 32, and a transmission unit 33 as an image data transmission unit.

  The I / F terminal 30 has a panel unit (not shown) for detachably fixing the sub-display 40, and image data by electromagnetic induction in a state where the sub-display 40 is fixed to the panel unit. Transmission is possible. The panel portion is not provided with terminals, contacts, or the like for electrically connecting the I / F terminal 30 and the sub display 40, and the sub display 40 can be easily attached and detached.

  The monitor unit 31 outputs a fixed state signal indicating whether or not the sub display 40 is fixed to the panel unit to the output control unit 32.

  Specifically, the monitor unit 31 has, for example, a switch on the surface of the panel unit. When the sub display 40 is fixed to the panel unit, the switch 31 is fixed by being pressed by the housing of the sub display 40. ON is output as a signal, and OFF is output when the sub-display 40 is removed from the panel unit.

  Further, the output control unit 32 inputs the image data and the display instruction signal as analog RGB signals output from the terminal device 10 via the display cable K2 and the control cable K3, and the fixed output output from the monitor unit 31. A status signal is input, and image data is output to the transmitter 33 based on the signal or the like.

  Specifically, when the display instruction signal is input in a state where the fixed state signal indicates that the sub display 40 is fixed to the panel unit, the output control unit 32 starts outputting image data, and then the panel When the sub display 40 is removed from the unit and a change in the input fixed state signal is detected, the output of the image data is stopped.

  Here, the output control unit 32 transmits only RGB image signals, vertical synchronization signals, and horizontal synchronization signals among the signals included in the analog RGB signals input via the display cable K2 as image data. To output.

  The transmission unit 33 includes, for example, an amplifier, a filter, a transmission coil, and the like. After the image data output from the output control unit 32 is amplified and filtered, the transmission unit 33 performs electromagnetic induction via the transmission coil. The information is transmitted to the sub display 40.

  Specifically, a transmission coil corresponding to each of the RGB image signals, the vertical synchronization signal, and the horizontal synchronization signal output from the output control unit 32 is provided inside the panel unit, and the sub display 40 is provided in the panel unit. When fixed, each of the receiving coils (provided corresponding to each of the RGB image signals, the vertical synchronizing signal, and the horizontal synchronizing signal) of the sub-display 40 described later approaches each other. When an electromagnetic wave corresponding to each signal output from the output control unit 32 is output from the transmission coil, each of these signals is displayed on the sub-display by the electromagnetic induction action between the transmission coil and the reception coil. 40 is transmitted.

Note that the transmitting coils are arranged at a predetermined interval from each other so that electromagnetic waves output from the transmitting coils do not interfere with other signal transmissions.
[1.4 Sub-display configuration and function overview]
Next, the configuration and functional overview of the sub display 40 will be described with reference to FIG.

  FIG. 3 is a block diagram illustrating an example of a schematic configuration of the sub-display 40 according to the first embodiment.

  The sub-display 40 is a so-called display device having a memory property such as electronic paper, and for example, a twisting ball display, a microcapsule type electrophoretic display, a toner display, an electronic separation type display, a cholesteric liquid crystal display, etc. can be applied. It is.

  As shown in FIG. 3, a receiving unit 41 as an image data receiving unit, an A / D (Analog / Digital) converter 42, a line memory 43 as an image data storing unit, and a counter unit 44 as a display position detecting unit. A data line driving unit 45, a scanning line driving unit 46, a display module 47, and a data processing unit 48 serving as a control signal output unit and a determination unit.

  The receiving unit 41 includes, for example, a receiving coil, an amplifier, a filter, and the like. The image data transmitted from the transmitting unit 33 of the I / F terminal 30 is received by electromagnetic induction through the coil and received. The processed image data is output to the A / D converter 42 and the counter unit 44.

  Specifically, when the receiving coil corresponding to each of the RGB image signals, the vertical synchronizing signal, and the horizontal synchronizing signal is provided in the housing of the sub display 40, and the sub display 40 is fixed to the panel unit In addition, the transmission coils of the I / F terminal 30 are close to each other. When an electromagnetic wave corresponding to each signal is output from each transmission coil of the I / F terminal 30, an electromotive force is generated in each reception coil due to electromagnetic induction, and an electric signal is generated from each reception coil. . The signal is amplified, filtered, etc., and output to the A / D converter 42 and the counter unit 44. At this time, the RGB image signals are output to the A / D converter 42, and the vertical synchronization signal and the horizontal synchronization signal are output to the counter unit 44, respectively. Note that an amplifier, a filter, and the like are not essential as long as each signal can be processed without performing amplification or filtering on each received signal.

  The A / D converter 42 converts each RGB image signal output from the receiving unit 41 from an analog signal to a digital value, and outputs the signal to the line memory 43 as image data of each color.

  The line memory 43 stores the image data output from the A / D converter 42 in series.

  Specifically, the line memory 43 has a storage area for storing image data for one row of all lines constituting one screen corresponding to each of RGB (for example, the number of pixels in the horizontal direction of one screen). Is 640 × 3 pixels), the image data input from the A / D converter 42 is sequentially updated and stored on a pixel-by-pixel basis, and in accordance with the readout control from the data processing unit 48. Thus, the currently stored image data for one line is output to the data processing unit 48.

  In this way, the line memory 43 serves as an image data storage unit that stores image data for one line every time one line of image data of all lines constituting one screen is input. It works.

  In the case of a display device having a memory property such as electronic paper, the display speed of the image (the rewrite speed of the display image) is usually slower than the input speed of the image data due to the display principle. When a frame memory is used for buffering, image data for one frame (one screen) is temporarily stored and then image display is performed slowly. However, in such a configuration, the waiting time until the stored image data is read and image display is performed and the waiting time until the image data of the next frame is written are increased, and the frame memory is used. Cost-effectiveness. Therefore, in this embodiment, the cost is reduced by using a line memory.

  In addition, the counter unit 44 determines, based on the vertical synchronization signal and the horizontal synchronization signal output from the reception unit 41, the image data stored in the line memory 43 in which line of all lines constituting one screen. Whether the image data is displayed is detected.

  Specifically, the counter unit 44 stores a display line (an example of a display position) of image data currently stored in the line memory 43. When a vertical synchronization signal is input, the counter unit 44 initializes the stored display line. It is set (for example, set to 0), and 1 is added every time a horizontal synchronizing signal is input. Each time a display row is updated, a row detection signal having a pulse or voltage corresponding to the display row is output to the data processing unit 48.

  In this manner, the counter unit 44 functions as a display position detecting unit that detects a position (row) at which an image composed of image data input for one line is displayed by the display module 47.

  The data line driving unit 45 includes a plurality of address drivers and the like. The data line driving unit 45 receives an address control signal (an example of a control signal) output from the data processing unit 48 based on the RGB image data and receives the address. A drive signal having a voltage corresponding to the control signal is output by each address driver, and a drive voltage is applied to a data line (to be described later) of the display module 47.

  The scanning line driving unit 46 includes a plurality of scan drivers and the like. The scanning line driving unit 46 receives a scan control signal (an example of a control signal) output from the data processing unit 48 based on the row detection signal, and performs the scan control. A drive signal having a voltage corresponding to the signal is output by each scan driver, and a drive voltage is applied to a scan line (to be described later) of the display module 47.

  The display module 47 includes a display element, a pixel electrode, a data line, a scanning line, and the like, and driving voltages output from the data line driving unit 45 and the scanning line driving unit 46 are transmitted via the data line and the scanning line. The image is displayed by being applied from the pixel electrode. Details of the configuration of the display module 47 will be described later.

  The data processing unit 48 includes a CPU, a RAM, a ROM, and the like. The CPU reads and executes various control programs stored in the ROM and the like, thereby controlling the respective units of the sub display 40 and controlling signals. It functions as an output means and a determination means.

  Specifically, the data processing unit 48 reads out image data for one row stored in the line memory 43 in synchronization with the input of the row detection signal from the counter unit 44, and performs predetermined image processing, for example. The image data is converted into 256 grayscale image data, and the converted image data is output to the data line driving unit 45 as an address control signal. In addition, the data processing unit 48 outputs the scan control signal to the scanning line driving unit 46 in synchronization with the output of the address control signal so that the image is displayed on the display row indicated by the input row detection signal. It has become.

  Further, the data processing unit 48 stores the time required for the display module 47 to display an image for one line in the ROM, and calculates the elapsed time from the output of the address control signal and the scan control signal, for example, a timer. Time is measured by interrupt control, and by comparing the elapsed time and the time stored in the ROM, it is detected that the time required for the image display has elapsed, and thereafter, new image data is read from the line memory 43. In the same manner as described above, each control signal (address control signal and scan control signal) is output.

  In this way, the data processing unit 48 reads the image data stored for one line in the line memory 43 and displays the image constituted by the image data on the display module 47 in the display line detected by the counter unit 44. After the output of each control signal to cause the display module 47 to display an image for one line at least, the image data stored in the line memory 43 at that time is It functions as control signal output means for outputting the following control signals.

  Further, each time each control signal is output, the data processing unit 48 stores the display line on which the output has been performed in the RAM as output information. When the image data is read from the line memory 43 and each control signal is to be output, each control signal has been output for the display line based on the output information and the display line detected by the counter unit 44. Each control signal for the display row is output only when it is determined whether or not there is an output and only when it is determined that it has not been output. In this way, the data processing unit 48 functions as a determination unit.

Since the line memory 43 is used for buffering the image data, the image data stored in the line memory 43 is updated at a predetermined horizontal synchronization period (period in which the horizontal synchronization signal is output). Here, after the image data of a certain row is read from the line memory 43 and each control signal is output, the next control signal is output until the image display for one row by the display module 47 is completed. Can not. However, since the image data stored in the line memory 43 is updated one after another while the image display is being performed, the image data stored in the line memory 43 at the time when the image display is completed is the first image data. Very unlikely to be the next line after the displayed line. At this time, when each control signal is output in order from the first line, that is, when trying to display an image in order from the first line, after waiting for the image display to be completed, an image in a desired line is further displayed. It is necessary to wait until the data is stored in the line memory 43, the processing efficiency is deteriorated, and the display speed is decreased. Therefore, in the present embodiment, when the time required for image display elapses (image display is completed), the line memory is configured so that each control signal is output for the image data stored in the line memory 43 at that time. Even with the configuration used, it is possible to display an image at a sufficient speed, and the control signal is not output again for a row for which a control signal has already been output (image display has been completed), thereby improving processing efficiency. It is.
[1.5 Display module configuration, etc.]
Next, the configuration and the like of the display module 47 will be described with reference to FIGS.

  FIG. 4 is a schematic diagram showing an example of a schematic configuration of the display module 47. In FIG. 4, the wiring configuration is mainly shown.

  As shown in FIG. 4, the display module 47 includes a transparent upper substrate 1 and a lower substrate 2 which are opposed to each other as a component of the display element. Here, N scanning lines are arranged on the inner surface of the upper substrate 1, and M data lines orthogonal to the N scanning lines are arranged on the inner surface of the lower substrate 2. That is, the display module 47 has a drive circuit 50 in which N scanning lines X1 to XN and M data lines Y1 to YM are arranged in a matrix. Pixel electrodes are formed at the intersections of the scanning lines X1 to XN and the data lines Y1 to YM, respectively.

  The drive circuit 50 is an electrostatic coupling type drive circuit. In the drive circuit 50, the feeding ends of the √M data lines are combined into one feeding end to form one block. Therefore, the feeding ends of the M data lines are divided into 2√M blocks in total at both ends. At this time, each block at one end of the M data lines shares only one data line with √M blocks at the other end. In addition, the address driver AD of the data line driving unit 45 that supplies a potential (a potential of a driving signal) to the data line is electrostatically coupled to the power supply end of each block via a capacitor Ca. Therefore, 2√M address drivers AD are attached to the entire M data lines.

  The feeding ends of N scanning lines are combined into one feeding end to form one block. Therefore, the feeding ends of the N scanning lines are divided into 2√N blocks in total at both ends. At this time, each block at one end of the N scanning lines shares only one scanning line with √N blocks at the other end. In addition, the scan driver SD of the scanning line driving unit 46 that supplies a potential (a potential of the driving signal) to the scanning line is electrostatically coupled to each block via the capacitor Cs. Therefore, 2√N scan drivers SD are attached to the N scanning lines as a whole.

  FIG. 5 is a plan view schematically showing the drive circuit 50 in a simplified manner. In the figure, the driving circuit 50 has a 9 × 9 matrix structure composed of nine scanning lines X1 to X9 and nine data lines Y1 to Y9. In FIG. 5, power supply terminals Xa1 to Xa3 and Xb1 to Xb3 indicate power supply terminals to which the scan driver SD is connected, and power supply terminals Ya1 to Ya3 and Yb1 to Yb3 indicate power supply terminals to which the address driver AD is connected. Since the drive circuit 50 has nine scan lines, it has 2√9 = 6 scan drivers SD. Further, since the drive circuit 50 has nine data lines, it has 2√9 = 6 address drivers AD. In the following description, for convenience of description, it is assumed that the drive circuit 50 of the display module 47 has the configuration shown in FIG. 5 unless otherwise specified. Further, the positions of the pixels formed at the intersections of the scanning lines X1 to X9 and the data lines Y1 to Y9 are represented by using the reference numerals of the respective scanning lines and data lines, for example, the scanning lines X1 and Y1. When the position P of the pixel at the intersection is indicated, it is expressed as coordinates (X1, Y1).

  Next, the structure of the pixel formed at the intersection of the scanning line and the data line in the display module 47 will be described.

  FIG. 6 is a cross-sectional view showing a cross-sectional configuration of one pixel of a display element in the display module 47, and shows an example in which a monochrome toner display is used as a display mechanism. A display element in a monochrome toner display has a structure in which black toner BT and white particles WT are sealed between opposed pixel electrodes. As will be described in detail later, in the toner display, rewriting such as writing or erasing of writing is performed by moving the charged black toner BT between the pixel electrodes by a voltage applied between the pixel electrodes.

  Hereinafter, a pixel located at coordinates (X1, Y1) will be described as an example. In FIG. 6, the pixel electrode 3 is formed on the inner surface of the upper substrate 1, and the pixel electrode 4 is formed on the inner surface of the lower substrate 2. The pixel electrode 3 is electrically connected to the scanning line X1, and the pixel electrode 4 is electrically connected to the data line Y1. Therefore, the potential of the pixel electrode 3 becomes the potential of the scanning line X1, and the potential of the pixel electrode 4 becomes the potential of the data line Y1.

  The potential of the pixel electrode 3 is V3, the potential applied to the power supply end Xa1 is VXa1, the potential applied to the power supply end Xb1 is VXb1, and the capacitance of the capacitor Cs is Cs. Since the pixel electrode 3 is electrostatically coupled to the capacitor Cs, the potential V3 of the pixel electrode 3 can be expressed as follows.

従って、式（１）は、以下のように表すことができる。

Therefore, Formula (1) can be expressed as follows.

図７（ａ）は、式（２）を基に、給電端Ｘａ１または給電端Ｘｂ１に印加される電位として、電位Ｖを加えた場合、または電位を０にした場合における画素電極３の電位の大きさを示す図表である。

FIG. 7A shows the potential of the pixel electrode 3 when the potential V is applied as the potential applied to the power feeding end Xa1 or the power feeding end Xb1 based on the formula (2) or when the potential is zero. It is a chart which shows a size.

  As shown in FIG. 7A, when the potential V is applied only to the power supply end Xa1 or only to the power supply end Xb1, the potential of the pixel electrode 3 becomes V / 2, and the power supply end Xa1 and the power supply end When the potential V is applied to both Xb1, the potential of the pixel electrode 3 becomes V. The potential V / 2 of the pixel electrode 3 when a potential is applied only to the power supply end Xa1 or only to the power supply end Xb1 is a half-selection potential.

  On the other hand, if the potential of the pixel electrode 4 is V4, the potential applied to the power supply end Ya1 is VYa1, and the potential applied to the power supply end Yb1 is VYb1, the pixel electrode 4 is electrostatically coupled to the capacitor Ca. The potential V4 of the pixel electrode 4 can be expressed as follows, similarly to the equation (2).

図７（ｂ）は、式（３）を基に、給電端Ｙａ１または給電端Ｙｂ１に印加される電位として、電位Ｖを加えた場合、または電位を０にした場合における画素電極４の電位の大きさを示す図表である。

FIG. 7B shows the potential of the pixel electrode 4 when the potential V is applied as the potential applied to the power supply end Ya1 or the power supply end Yb1 based on the formula (3) or when the potential is zero. It is a chart which shows a size.

  As shown in FIG. 4B, when the potential V is applied only to the power supply end Ya1 or only to the power supply end Yb1, the potential of the pixel electrode 4 becomes V / 2, and the power supply end Ya1 and the power supply end When the potential V is applied to both of Yb1, the potential of the pixel electrode 4 becomes V. The potential V / 2 of the pixel electrode 4 when a potential is applied only to the power supply end Ya1 or only to the power supply end Yb1 is a half-selection potential.

  When the voltage V is applied between the pixel electrodes for writing only to the pixel at the position of the coordinates (X1, Y1), the potential −V / 2 is applied to the scanning line X1, and the potential is applied to the data line Y1. What is necessary is just to apply V / 2. Specifically, the potential −V / 2 is applied to the scanning line X1 by simultaneously applying the potential −V / 2 to the power feeding end Xa1 and the power feeding end Xb1. Further, the potential V / 2 is applied to the data line Y1 by simultaneously applying the potential V / 2 to the power supply end Ya1 and the power supply end Yb1. In this manner, a potential difference V is generated between the pixel electrodes of the pixel located at the coordinates (X1, Y1), and the voltage V is applied.

  In this case, the scanning line X1 and the data line Y1 are also applied to the scanning lines other than the scanning line X1 connected to the power supply terminals Xa1 and Xb1 and the data lines other than the data line Y1 connected to the power supply terminals Ya1 and Yb1. A potential that is half the magnitude of the applied potential, that is, the half-selection potential described above is applied. In FIG. 5, when the potential −V / 2 is applied to the power supply end Xa1 and the potential −V / 2 is applied to the power supply end Xb1, the scanning line X1 connected to both the power supply end Xa1 and the power supply end Xb1 is As described above, the potential is −V / 2. However, the scanning lines X2 and X3 that are connected to the feeding end Xa1 but not connected to the feeding end Xb1, and the scanning line X4 that is not connected to the feeding end Xa1 but connected to the feeding end Xb1. , X7 is also applied with the potential −V / 4. This potential −V / 4 is a half-selected potential. Further, when the potential V / 2 is applied to the power supply end Ya1 and the potential V / 2 is applied to the power supply end Yb1, the scanning line Y1 connected to both the power supply end Ya1 and the power supply end Yb1 is as described above. The potential is V / 2. However, scanning lines Y2 and Y3 that are connected to the feeding end Ya1 but not connected to the feeding end Yb1, and scanning lines Y4 that are not connected to the feeding end Ya1 but connected to the feeding end Yb1. , Y7 is also applied with the potential V / 4. This potential V / 4 is a half-selected potential.

  For this reason, it is necessary to prevent a malfunction that a pixel that does not perform writing performs writing due to a half-selection potential applied to the pixel that does not perform writing. Therefore, the pixel does not perform writing with a voltage generated between the pixel electrodes when a half-selection potential is applied to the pixel electrode, and performs writing only when a voltage higher than that is applied between the pixel electrodes. It is necessary to have. That is, the pixel needs to have a characteristic of writing only when the voltage between the pixel electrodes becomes larger than a predetermined value (threshold voltage).

  In the electrostatic coupling type drive circuit, the pixel electrode is connected to the address driver AD or the scan driver SD via a capacitor. Therefore, since the electrostatic coupling type driving circuit can transmit only the AC component of the electric signal to the pixel electrode, the display devices that can be driven are limited. Specifically, it can be used for a voltage-driven display device, but cannot be used for a current-driven display device or a display device that requires a bias voltage.

  Next, returning to FIG. 6, the structure of the display element of the display module 47 will be described. As described above, by applying a potential to the scanning line and the data line, a voltage is applied between the pixel electrodes of the pixel at the intersection. In FIG. 6, a voltage V is applied in the direction from the pixel electrode 3 to the pixel electrode 4 by applying a potential of V / 2 to the pixel electrode 4 and −V / 2 to the pixel electrode 3. . As a result, a positive charge is added to the pixel electrode 4 and a negative charge is added to the pixel electrode 3.

  A black toner BT and white particles WT are enclosed between the pixel electrode 3 and the pixel electrode 4. As the black toner BT, a conductive toner is used, and as the white particles WT, fine particles such as carbon fluoride that are slippery are used. A charge transport layer 6 is applied to the pixel electrode 4, and the charge transport layer 6 serves to inject the positive charge of the pixel electrode 4 into the black toner BT.

  A case where the pixel performs black display will be described. The black toner BT in contact with the charge transport layer 6 is positively charged by being injected with a positive charge by the charge transport layer 6. The positively charged black toner BT moves toward the pixel electrode 3 because it has a Coulomb attractive force with the pixel electrode 3 to which a negative charge is added. If the voltage applied between the pixel electrodes is low, the amount of negative charge added to the pixel electrode 3 and the amount of positive charge added to the black toner BT are reduced. Insufficient coulomb attraction to respond. Therefore, in order for the black toner BT to respond, it is necessary to make the magnitude of the voltage applied between the pixel electrodes larger than a certain voltage.

  The black toner BT that has moved to the pixel electrode 3 adheres to the pixel electrode 3 due to Coulomb attractive force. At this time, when viewed from above the upper substrate 1, the black toner BT adheres to the pixel electrode 3, so that the pixel looks black. In this way, black display of pixels, that is, writing into the pixels is performed.

  Here, even if the application of the voltage between the pixel electrodes is stopped, that is, even if the voltage applied between the pixel electrodes is set to 0 [V], positive charge is applied to the pixel electrode 4, and Since the negative charge is kept added, the black toner BT is kept attached to the pixel electrode 3. Therefore, even if the application of the voltage between the pixel electrodes is stopped, the pixel remains in a black display state. In other words, the pixel retains the written state.

  Next, a case where the pixel performs white display will be described. In this case, the polarity of the voltage applied to the pixel electrode 3 and the pixel electrode 4 is changed, and a potential of −V / 2 is applied to the pixel electrode 4 and a potential of V / 2 is applied to the pixel electrode 3. Thus, the voltage V is applied in the direction from the pixel electrode 3 to the pixel electrode 3. As a result, a positive charge is added to the pixel electrode 3 and a negative charge is added to the pixel electrode 4.

  A charge transport layer 5 is also applied to the pixel electrode 3, and the charge transport layer 5 has a function of injecting the positive charge of the pixel electrode 3 into the black toner BT. The black toner BT that is in contact with the charge transport layer 5 is positively charged when a positive charge is injected by the charge transport layer 5. The positively charged black toner BT has a Coulomb attractive force with the pixel electrode 4 to which a negative charge is applied, and moves toward the pixel electrode 4 and adheres to the pixel electrode 4. Also in this case, since the black toner BT needs to obtain a sufficient coulomber for response, the magnitude of the voltage applied between the pixel electrodes needs to be larger than a certain voltage. At this time, when viewed from above the upper substrate 1, the black toner BT adheres to the pixel electrode 4 so that only the white particles WT are visually recognized, so that the pixel appears white. In this way, white display of the pixels, that is, erase of writing is performed.

  Here, even if the application of the voltage between the pixel electrodes is stopped, that is, even if the voltage applied between the pixel electrodes is set to 0 [V], negative charge is applied to the pixel electrode 4 and Maintains a state in which positive charges are respectively added, so that the black toner BT maintains a state of being attached to the pixel electrode 4. Therefore, even if the application of the voltage between the pixel electrodes is stopped, the pixel remains in a white display state.

As described above, the display element of the display module 47 displays an image when a driving voltage is applied, and maintains the image state even after the application of the driving voltage is stopped.
[1.6 Drive sequence in drive circuit]
Next, a driving sequence in the driving circuit 50 will be described with reference to FIG.

  FIG. 8 is a diagram illustrating an example of a driving sequence when the driving circuit 50 performs black display on the pixels in the first row.

  The display module 47 according to the present embodiment does not display the images constituting one screen in order from the first line to the last line, but when the display of the image on the predetermined line is completed under the control of the data processing unit 48. Thus, an image is displayed on the display line of the image data stored in the line memory 43 (display line detected by the counter unit 44).

  Therefore, hereinafter, as an example, a description will be given of a driving sequence in the case of writing to the pixels in the first row (coordinates (X1, Y1) to (X1, Y9)), that is, causing the pixels in the first row to perform black display. .

  The drive sequence of FIG. 8 includes the magnitudes of voltages applied to the power supply terminals Xa1 to Xa3 and Xb1 to Xb3 of the scanning lines in the drive circuit 50 of FIG. 5 and the power supply terminals Ya1 to Ya3 and Yb1 to Yb3 of the data lines. The magnitude of the voltage applied to each is shown.

  The electrical characteristics of the display module 47 are normally white, the threshold voltage for writing to the pixel is 90 [V], and the voltage applied between the pixel electrodes does not change at 75 [V]. It is assumed that rewriting is performed at 100 [V]. The black display is performed by applying a relatively positive potential to the data line or applying a relatively negative potential to the scanning line. The white display is performed by applying a relatively negative potential to the data lines or applying a relatively positive potential to the scanning lines. A specific drive sequence will be described below.

  First, in the first period T1, the display module 47 is subjected to a refresh operation for erasing previous display contents and making the charge holding state in the display panel uniform. In order to make the charge holding state uniform, it is effective to apply a voltage higher than the normal writing voltage between the pixel electrodes. Therefore, a pulse voltage having a positive voltage of 100 to 150 [V] ( An example of the drive voltage) needs to be applied as a refresh pulse alternately to the scanning line and the data line a plurality of times. In order to make the final display white, a refresh pulse is finally applied to the scanning lines, and the refresh operation ends. Specifically, for example, when a refresh pulse of 150 [V] is applied between the pixel electrodes to display in the order of white display, black display, and white display, as shown in FIG. A refresh pulse having a voltage of 150 [V] is simultaneously applied to Xa1 to Xa3 and Xb1 to Xb3 to perform white display. Thereafter, a refresh pulse having a voltage of 150 [V] is simultaneously applied to the power supply ends Ya1 to Ya3 and Yb1 to Yb3 of the data line to perform black display. After that, a refresh pulse having a voltage of 150 [V] is simultaneously applied to the power supply ends Xa1 to Xa3 and Xb1 to Xb3 of the scanning lines to perform white display. In this manner, by alternately applying a voltage higher than the normal writing voltage to each of the scanning lines and the data lines, a refresh operation that can make the charge holding state in the display panel uniform can be performed. .

  In the next period T2, writing is performed on the pixel at the coordinates (X1, Y1). In order to write to the pixel, it is necessary to apply a voltage higher than the threshold voltage 90 [V] between the pixel electrodes. In the driving sequence of FIG. 8, the pixel electrode is based on the electrical characteristics described above. Writing to the pixel is performed by applying a voltage of 100 [V] in between. In order to apply a voltage of 100 [V] between the pixel electrodes, a potential of −50 [V] is applied to the scanning line X1, and a potential of 50 [V] is applied to the data line Y1. Specifically, in order to apply a potential of −50 [V] to the scanning line X1, a pulse voltage having a voltage of −50 [V] is simultaneously applied to the power feeding ends Xa1 and Xb1 of the scanning line. At the same time, in order to apply a potential of 50 [V] to the data line Y1, a pulse voltage having a voltage of 50 [V] is simultaneously applied to the power supply ends Ya1 and Yb1 of the data line. Thereby, a voltage of 100 [V] is applied between the pixel electrodes in the pixel at the coordinates (X1, Y1), and writing to the pixel is performed. Note that the optimum value of the pulse width is determined from the magnitude of the applied voltage, the width between the upper substrate 1 and the lower substrate 2, the amount of charge per pixel, the capacitance of a capacitor connected in series, and the like. After this, before the potential is applied to the data line Y2 in the period T3, the potential of the scanning line X1 is once returned to 0 [V]. Therefore, the power supply terminals Xa1 and Xb1 of the scanning line are simultaneously set to 0 [V ] Is applied.

  In the period T3, writing is performed on the pixel at the coordinates (X1, Y2). Specifically, in order to apply a potential of −50 [V] to the scanning line X1, a pulse voltage having a voltage of −50 [V] is simultaneously applied to the power feeding ends Xa1 and Xb1 of the scanning line. At the same time, in order to apply a potential of 50 [V] to the data line Y2, a pulse voltage having a voltage of 50 [V] is simultaneously applied to the power supply ends Ya1 and Yb2 of the data line. Thereby, a voltage of 100 [V] is applied between the pixel electrodes in the pixel at the coordinates (X1, Y2), and writing to the pixel is performed. After that, by simultaneously applying 0 [V] to the feeding ends Xa1 and Xb1 of the scanning line, the potential of the scanning line X1 is once set to 0 before the potential is applied to the data line Y3 in the period T4. Return to [V].

  In the period T4, writing is performed on the pixel at the coordinates (X1, Y3). Specifically, in order to apply a potential of −50 [V] to the scanning line X1, a pulse voltage having a voltage of −50 [V] is simultaneously applied to the power feeding ends Xa1 and Xb1 of the scanning line. At the same time, in order to apply a potential of 50 [V] to the data line Y3, a pulse voltage having a voltage of 50 [V] is simultaneously applied to the power supply ends Ya1 and Yb3 of the data line. As a result, a voltage of 10 [V] is applied between the pixel electrodes in the pixel at the coordinates (X1, Y3), and writing to the pixel is performed. Thereafter, 0 [V] is simultaneously applied to the power feeding ends Xa1 and Xb1 of the scanning line, and the potential of the scanning line X1 is once returned to 0 [V] before the potential is applied to the data line Y4.

  By the operation in the period T2 to T4 described above, writing to the pixel at the intersection of the scanning line X1 and the data lines Y1 to T3 is completed.

  In the period T5, writing is performed on the pixel at the intersection of the scanning line X1 and the data lines Y4 to Y9. Also in this case, the same operation as that in the periods 2 to T4 is performed.

  By repeating the operation similar to the operation in the periods 2 to T4 described above for the scanning lines X2 to X9, writing to the pixels on all the lines of one screen can be performed. For example, in order to display the second row, a pulse voltage of −50 [V] is applied to the power feeding ends Xa1 and Xb2, respectively, and to perform the display in the third row, −50 [V to the power feeding ends Xa1 and Xb3, respectively. In order to display the ninth row by applying a pulse voltage of V], a pulse voltage of −50 [V] is applied to the power supply terminals Xa3 and Xb3. At this time, pulse voltages are applied to Ya1 to Ya3 and Yb1 to Yb3 in the same manner as in the first row.

As can be seen from the above, in the display module 47 according to the present embodiment, the number of drivers is 2√M + 2√N, which is smaller than the number of M + N drivers used in a normal matrix driving system driving circuit. Writing to all the pixels of one screen can be performed. Specifically, taking a display device having 256 × 256 [dot] pixels as an example, a general display device requires 256 + 256 = 512 drivers for writing to all pixels. On the other hand, in the display module 47 according to the present embodiment, 2 × √256 + 2 × √256 = 64 drivers are sufficient. Therefore, in this case, the number of drivers can be reduced by about 87% compared with a general display device.
[1.7 Operation of information display system]
Next, the operation of the information display system S will be described with reference to FIG.

  FIG. 9 is a flowchart illustrating a processing example of the data processing unit 48 of the sub display 40.

  The sub display 40 is fixed to the panel portion of the I / F terminal 30 by the user, and is in a state in which image data can be input from the I / F terminal 30 to display an image.

  The terminal device 10 executes an OS, a driver program, application software, and the like stored in the storage unit. When the display driver program is executed, image data is written in the graphic memory of the display control unit. The image data is read out in a frame cycle and repeatedly output as analog RGB signals to the main display 20 and the I / F terminal 30.

  The I / F terminal 30 inputs the analog RGB signal output from the terminal device 10, but no image data is output from the output control unit 32 because the display instruction signal from the terminal device 10 is not input. The image data as electromagnetic waves is not output from the transmission unit 33. Therefore, the display module 47 of the sub-display 40 is in a non-display state (all pixel white display).

  Here, when a user operates the operation unit of the terminal device 10 and a display instruction signal is output from the terminal device 10, the output control unit 32 of the I / F terminal 30 outputs image data to the transmission unit 33. The image data is output as an electromagnetic wave from the transmission coil of the transmission unit 33 and is received by the reception unit 41 of the sub-display 40 by the electromagnetic induction action.

  In the sub display 40, among the image data received by the receiving unit 41, each RGB image signal is converted into a digital value by the A / D converter 42 and stored in the line memory 43, and based on the vertical synchronization signal and the horizontal synchronization signal. Then, the counter unit 44 outputs a row detection signal.

  Then, the data processing unit 48 executes the processing shown in FIG. 9 in synchronization with the input of the row detection signal.

  First, the data processing unit 48 monitors the input of the row detection signal (step S1). When the row detection signal is input (step S1: YES), the image data for one row stored in the line memory 43 is stored. Is read (step S2).

  Next, the data processing unit 48 determines whether or not the image display for one line is completed by the display module 47, that is, whether or not the next image display is possible, and the time required for the image display stored in the ROM. Judgment is made by comparing the time elapsed since the last output of each control signal (step S3). When the image display is not completed (step S3: NO), the process shifts to waiting for input of a row detection signal. (Step S1).

  On the other hand, when the image display is completed (step S3: YES), the data processing unit 48 refers to the output completion information and determines whether or not each control signal has been output for the display row indicated by the row detection signal. That is, it is determined whether or not the image of the row is not displayed (step S4). If the image has already been output (step S4: NO), the processing shifts to waiting for input of a row detection signal (step S1).

  On the other hand, if each control signal has not been output (step S4: YES), an address control signal is output to the data line driver 45 so that an image composed of the read image data is displayed (step S5). Then, a scan control signal is output to the scanning line drive unit 46 so that the display row indicated by the inputted row detection signal is scanned (step S6).

  Then, a driving signal corresponding to the address control signal is output from each address driver AD of the data line driving unit 45, and a driving voltage is applied to each connected data line as shown in FIG. In the scanning line driving unit 46, a driving signal is output from the scan driver SD corresponding to the scan control signal, and a driving voltage is applied to the scanning line connected to the driver, for example, as shown in FIG. The

  Then, by driving the pulse voltage, among the pixels located in the detected display row of the display element of the display module 47, black display is performed on the pixel to which the drive voltage necessary for writing is applied.

  After outputting each control signal, the data processing unit 48 additionally stores the detected display row in the output information (step S7), and resets the elapsed time to 0 (step 8).

  Then, the data processing unit 48 refers to the output completion information to determine whether or not the control signal has been output for all lines (step S9), and when there is an unoutput line (step S9: NO). ), And shifts to waiting for input of a row detection signal (step S1).

  On the other hand, if all lines have been output (step S9: YES), the output completion information is cleared (step S10), and the process ends. Here, the image display for all the pixels is completed.

  Thereafter, when the sub display 40 is removed from the panel section of the I / F terminal 30, the transmission of image data from the I / F terminal 30 is stopped, but the sub display 40 continues to maintain the image display state. Therefore, even if the sub display 40 is moved away from the terminal device 10 and the I / F terminal 30, the display content can be confirmed.

  As described above, according to the present embodiment, every time one line of image data of all lines constituting one screen is input, the image data for one line is stored in the line memory 43. The counter unit 44 detects the position where the display module 47 displays an image composed of image data stored and inputted for one line. Then, the data processing unit 48 reads the image data stored in one line in the line memory 43, and causes the display module 47 to display an image composed of the image data on the display line detected by the counter unit 44. After the address control signal and the scan control signal are output and the display module 47 outputs the address control signal and the scan control signal, the image data stored in the line memory 43 at that time after at least the time required for displaying the image for one line has elapsed. The following control signals are output. In this way, when each control signal is output one after another, image display for one screen is completed.

  Accordingly, a display device can be manufactured using an inexpensive memory such as a line memory, and the cost can be reduced. Even when a line memory or the like is used, the image display speed can be made relatively high.

  Further, since the image data output from the terminal device 10 is transmitted between the I / F terminal 30 and the sub display 40 by electromagnetic induction, the sub display 40 does not cause wear or breakage of the connection terminals. Can be easily attached and detached, and contactless connection can be performed while suppressing the cost of communication components (in the case of an ideal configuration, only a coil for transmission and reception).

  Furthermore, when the data processing unit 48 tries to output each control signal, based on the output information and the display row detected by the counter unit 44, whether or not each control signal has been output for the display row. Only when it is determined that it has not been output, each control signal for the display line is output, so that the display process of the already displayed image is prevented and the image is displayed efficiently. be able to.

Furthermore, a plurality of scanning lines and a plurality of data lines are arranged on the display element of the display module 47 so as to intersect with each other, and a pixel electrode is formed corresponding to each of the intersections. Since the address driver AD and the scan driver SD are configured to be electrostatically coupled, the number of the address driver AD and the scan driver SD can be reduced, and the cost can be reduced.
[2. Second Embodiment]
Next, a second embodiment of the present invention will be described.

In the first embodiment described above, image data (analog RGB signals) is transmitted by electromagnetic induction between the I / F terminal 30 and the sub-display 40. In the second embodiment described below, The I / F terminal 30 outputs an address control signal and a scan control signal based on the image data, and transmits each control signal by electromagnetic induction. Note that the overall configuration of the information display system S according to the present embodiment is the same as that of the first embodiment, and a detailed description thereof will be omitted.
[2.1 I / F terminal 30 configuration and function overview]
Next, the configuration and functional overview of the I / F terminal 30 will be described with reference to FIG.

  FIG. 10 is a block diagram illustrating an example of a schematic configuration of the I / F terminal 30 according to the second embodiment. In FIG. 10, the same reference numerals are given to the same elements as those in FIG.

  As shown in FIG. 10, the I / F terminal 30 includes a monitor unit 31, an output control unit 32, a transmission unit 33 as a control signal transmission unit, an A / D converter 34, and a line as an image data storage unit. A memory 35, a counter unit 36 as a display position detection unit, and a data processing unit 37 as a control signal output unit and a determination unit are provided.

  Here, the configurations and functions of the A / D converter 34, the line memory 35, the counter unit 36, and the data processing unit 37 are basically the same as those of the A / D converter 42, the line memory 43, and the sub display 40 according to the first embodiment. This is the same as the counter unit 44 and the data processing unit 48, respectively.

  That is, the RGB image signals output from the output control unit 32 are converted into digital image data by the A / D converter 34 and stored in the line memory 35. The vertical synchronization signal and the horizontal synchronization signal output from the output control unit 32 are input to the counter unit 36, and a row detection signal is output from the counter unit 36.

  The data processing unit 37 receives an output detection signal, reads image data from the line memory 35, and outputs an address control signal and a scan control signal to the transmission unit 33.

Further, the transmission unit 33 has a transmission coil corresponding to each control signal output from the data processing unit 37, and transmits each control signal to the sub display 40 by electromagnetic induction.
[2.2 Sub-display 40 configuration and function overview]
Next, the configuration and functional overview of the sub-display 40 will be described with reference to FIG.

  FIG. 11 is a block diagram showing an example of a schematic configuration of the sub-display 40 according to the second embodiment. In FIG. 11, elements similar to those in FIG. 3 are given the same reference numerals.

  As shown in FIG. 11, the sub-display 40 includes a receiving unit 41 as a control signal receiving unit, a data line driving unit 45, a scanning line driving unit 46, and a display module 47.

  The receiving unit 41 has a receiving coil corresponding to each of the address control signal and the scan control signal, receives each control signal transmitted as an electromagnetic wave from the transmitting unit 33 of the I / F terminal 30, and drives the data line. It outputs to the part 45 and the scanning line drive part 46. FIG.

  Note that the configuration of the display module 47 and the drive circuit 50 and the drive sequence of the drive circuit 50 are the same as those in the first embodiment, and detailed description thereof is omitted.

  The operation of the information display system S is basically the same as that in the first embodiment, and the processing content of the data processing unit 37 of the I / F terminal 30 is the data of the sub display 40 according to the first embodiment. Since it is the same as the processing content of the process part 48, detailed description is abbreviate | omitted.

As described above, according to the present embodiment, in addition to the effect by the same operation as that of the first embodiment, the image data output from the terminal device 10 is processed by the I / F terminal 30, and the address control signal Since the scan control signal is transmitted to the sub display 40 by electromagnetic induction, the sub display can have a simple configuration, and the cost of the sub display can be reduced. The cost reduction effect becomes more prominent as the number of sub-displays included in the information display system increases.
[3. Third Embodiment]
Next, a third embodiment of the present invention will be described.

In the second embodiment described above, the address control signal and the scan control signal are transmitted by electromagnetic induction between the I / F terminal 30 and the sub-display 40. In the third embodiment described below, The I / F terminal 30 outputs drive signals and transmits the drive signals by electromagnetic induction. Note that the overall configuration of the information display system S according to the present embodiment is the same as that of the first embodiment, and a detailed description thereof will be omitted.
[3.1 I / F terminal 30 configuration and function overview]
Next, the configuration and functional overview of the I / F terminal 30 will be described with reference to FIG.

  FIG. 12 is a block diagram showing an example of a schematic configuration of the I / F terminal 30 according to the third embodiment. In FIG. 12, the same elements as those in FIG. 10 are given the same reference numerals.

  As shown in FIG. 12, the I / F terminal 30 includes a monitor unit 31, an output control unit 32, a transmission unit 33 as a drive signal transmission unit, an A / D converter 34, and a line as an image data storage unit. A memory 35, a counter unit 36 as a display position detection unit, a data processing unit 37 as a control signal output unit and a determination unit, a data line driving unit 38, and a scanning line driving unit 39 are provided.

  Here, the configurations and functions of the data line driving unit 38 and the scanning line driving unit 39 are basically the same as those of the data line driving unit 45 and the scanning line driving unit 46 of the sub-display 40 according to the first embodiment.

  That is, when the number of data lines of the display module 47 in the sub display 40 is M, the data line driving unit 38 has 2√M address drivers AD and is output from the data processing unit 37. Based on the address control signal, each address driver AD outputs a drive signal corresponding to the drive voltage to be applied to the corresponding data line to the transmitter 33.

  The scanning line driving unit 39 has 2√N scanning drivers SD when the number of scanning lines of the display module 47 in the sub-display 40 is N, and is output from the data processing unit 37. Based on the scan control signal, each scan driver SD outputs a drive signal corresponding to the drive voltage to be applied to the corresponding scan line to the transmitter 33.

Further, the transmission unit 33 has transmission coils corresponding to the drive signals output from the data line driving unit 38 and the scanning line driving unit 39 (2√M + 2√N), respectively. The information is transmitted to the sub display 40 by electromagnetic induction.
[3.2 Configuration of Sub Display 40 and Function Overview]
Next, the configuration and functional overview of the sub display 40 will be described with reference to FIG.

  FIG. 13 is a block diagram showing an example of a schematic configuration of the sub-display 40 according to the third embodiment. In FIG. 13, the same elements as those in FIG. 11 are given the same reference numerals.

  As shown in FIG. 13, the sub display 40 includes a receiving unit 41 as a drive signal receiving unit and a display module 47.

  The receiving unit 41 has a receiving coil corresponding to each driving signal (2√M + 2√N), and receives each driving signal transmitted as an electromagnetic wave from the transmitting unit 33 of the I / F terminal 30. The respective signals are applied to the data line and scanning line supply ends of the display module 47.

  Each data line and scanning line of the display module 47 are electrostatically coupled to the receiving coil of the corresponding receiving unit 41 via capacitors Ca and Cs.

  Note that the configurations of the display module 47 and the drive circuit 50 and the drive sequence of the drive circuit 50 are the same as those in the second embodiment, and a detailed description thereof will be omitted.

  Further, the operation of the information display system S is basically the same as that in the second embodiment, and thus detailed description thereof is omitted.

  As described above, according to the present embodiment, in addition to the effect by the same operation as in the second embodiment, a drive signal is output from the I / F terminal 30 and the drive signal is output to the sub display 40 by electromagnetic induction. Since transmission is performed, it is possible to make the sub-display simpler and to reduce the cost of the sub-display.

  In each of the above embodiments, the terminal device 10, the main display 20, and the I / F terminal 30 are separate devices. However, all or a part of them may be configured as an integrated device, for example, You may comprise as PDA (Personal Digital Assistant) etc.

  Moreover, in each said embodiment, although it comprised so that two display cables might be connected to the terminal device 10, for example, one display cable is connected to the terminal device 10, and a signal distributor etc. are connected. The display cable may be connected to each of the main display 20 and the I / F terminal 30, or the I / F terminal 30 may be provided with the signal distributor and the like.

  Furthermore, in each of the above embodiments, image data is output from the terminal device 10 in the form of analog RGB signals. For example, NTSC (National Television Standards Committee), PAL (Phase Alternating Line), DVI You may output in the form of signals, such as (Digital Visual Interface).

  Furthermore, in each of the above embodiments, image data for one row is stored in the line memory, and the data processing unit performs processing such as output of a control signal in units of one row. You may make it memorize | store in a line memory and to process in the said several line unit.

  Furthermore, in each of the above embodiments, all the data lines and scanning lines of the driving circuit 50 in the sub-display 40 are electrostatically coupled with the driving drivers or receiving coils, and are driven by the electrostatic coupling method. However, for example, they may be coupled without a capacitor and driven by a simple matrix method. However, in this case, since drivers or receiving coils corresponding to the data lines and the scanning lines are required, the number of the drivers or receiving coils increases. Further, only one of the data line and the scanning line may be electrostatically coupled. In this case, the number of driving drivers or receiving coils is reduced as compared with the case where all are coupled by the simple matrix method. be able to.

It is a figure which shows an example of schematic structure of the information display system. It is a block diagram which shows an example of schematic structure of the I / F terminal 30 which concerns on 1st Embodiment. It is a block diagram which shows an example of schematic structure of the sub display 40 which concerns on 2nd Embodiment. 4 is a schematic diagram illustrating an example of a schematic configuration of a display module 47. FIG. 3 is a plan view schematically showing the drive circuit 50 in a simplified manner. FIG. 4 is a cross-sectional view showing a cross-sectional configuration of one pixel of a display element in a display module 47. FIG. It is a figure which shows the magnitude | size of the electric potential of the pixel electrode 3 when the electric potential V is added as an electric potential applied to the electric power feeding end Xa1 or electric power feeding end Xb1, or when an electric potential is set to 0. FIG. It is a figure which shows an example of the drive sequence in the case of performing black display to the pixel of the 1st line by the drive circuit. 4 is a flowchart illustrating a processing example of a data processing unit 48 of the sub display 40. It is a block diagram which shows an example of schematic structure of the I / F terminal 30 which concerns on 2nd Embodiment. It is a block diagram which shows an example of schematic structure of the sub display 40 which concerns on 2nd Embodiment. It is a block diagram which shows an example of schematic structure of the I / F terminal 30 which concerns on 3rd Embodiment. It is a block diagram which shows an example of schematic structure of the sub display 40 which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper substrate 2 Lower substrate 3, 4 Pixel electrode 5, 6 Charge transport layer 10 Terminal device 20 Main display 30 I / F interface 31 Monitor unit 32 Output control unit 33 Transmission unit 34, 42 A / D converter 35, 43 lines Memory 36, 44 Counter unit 37, 48 Data processing unit 38, 45 Data line drive unit 39, 46 Scan line drive unit 40 Sub display 41 Receiver unit 47 Display module 50 Drive circuit BT Black toner WT White particle S Information display system

Claims (11)

When a drive voltage is applied, an image is displayed, and a control signal for controlling the drive voltage is input to a display device including a display element that holds the display state of the image even after the application of the drive voltage is stopped. A control device for outputting based on the image data obtained,
The number of pixel lines constituting one screen by sequentially inputting the image data of each pixel line constituting one screen at a cycle shorter than the time required for writing pixels for one pixel line by the display device each time the image data of a predetermined number of pixel line is input less than the display device regardless of whether data is being written in the pixel, the input image data of the pixel line of the predetermined number of Image data storage means for storing
First determination means for determining whether or not a writing time required for writing pixels for the predetermined number of pixel lines by the display device has elapsed since the output of the control signal;
Display position detecting means for detecting a position where an image composed of image data for the predetermined number of pixel lines stored in the image data storage means is displayed by the display device;
Second determination means for determining whether or not the control signal for displaying an image at the detected display position has been output;
The first determination means determines that the writing time has elapsed since the output of the control signal, and the control signal for displaying an image at the detected display position has not been output. When determined by the second determination means , the image constituted by the image data is detected based on the image data for the predetermined number of pixel lines stored in the image data storage means at that time. Control signal output means for outputting the control signal for display on the display position by the display device;
Control device characterized by Ru with a. A display system comprising: the control device and the display device according to claim 1; and an output device that outputs the image data.
The output device is
Image data transmitting means for transmitting the output image data to the control device by electromagnetic induction;
The controller is
A display system further comprising image data receiving means for receiving image data transmitted by the output device by electromagnetic induction and inputting the image data. A display system comprising the control device and the display device according to claim 1,
The controller is
Control signal transmission means for transmitting the output control signal to the display device by electromagnetic induction,
The display device
Display system, characterized by further comprising a control signal receiving means for receiving the transmitted control signal Ri by the said control device with an electromagnetic induction. A display system comprising the control device and the display device according to claim 1,
The controller is
Drive signal output means for outputting a drive signal corresponding to the drive voltage to be applied to the display element of the display device based on the output control signal;
Drive signal transmitting means for transmitting the output drive signal to the display device by electromagnetic induction;
The display device
The display system further comprising drive signal receiving means for receiving the drive signal transmitted by the control device by electromagnetic induction. The display system according to any one of claims 2 to 4,
The display device
The display device further comprises a plurality of scanning lines and a plurality of data lines arranged so as to cross each other.
The display system according to claim 1, wherein the drive voltage is applied by electrostatic coupling to power supply terminals at both ends of at least one of the scanning line and the data line. A control device included in the display system according to any one of claims 2 to 5,
A control apparatus comprising: the image data storage means; the first determination means; the display position detection means; the second determination means; and the control signal output means. A computer included in the control device according to claim 1 or 6,
A computer program that functions as the first determination means, the second determination means, and the control signal output means. When a drive voltage is applied, an image is displayed, and a control signal for controlling the drive voltage is input to a display device including a display element that holds the display state of the image even after the application of the drive voltage is stopped A control method in a control device for outputting based on the image data,
The number of pixel lines constituting one screen by sequentially inputting the image data of each pixel line constituting one screen at a cycle shorter than the time required for writing pixels for one pixel line by the display device Each time the image data for a predetermined number of pixel lines is input, the input image data for the predetermined number of pixel lines is input regardless of whether or not the display device is writing pixels. Is stored in an image data storage means for storing image data for the predetermined number of pixel lines, and
A first determination step of determining whether or not a writing time required for writing pixels of the predetermined number of pixel lines by the display device has elapsed since the output of the control signal;
A display position detecting step of detecting a position where an image composed of image data for the predetermined number of pixel lines stored in the image data storage means is displayed by the display device;
A second determination step of determining whether or not the control signal for displaying an image at the detected display position has been output;
It is determined in the first determination step that the writing time has passed since the control signal was output, and the control signal for displaying an image at the detected display position has not been output. When it is determined in the second determination step, the image constituted by the image data is detected based on the image data for the predetermined number of pixel lines stored in the image data storage unit at that time. A control signal output step for outputting the control signal for display on the display position by the display device;
The control method characterized by including. A display device including a display element that displays an image by applying a drive voltage and maintains a display state of the image even after application of the drive voltage is stopped, and for controlling the drive voltage for the display device A control method in a display system comprising: a control device that outputs a control signal based on input image data; and an output device that outputs the image data,
An image data transmitting step in which the output device transmits the output image data to the control device by electromagnetic induction;
An image data receiving step in which the control device receives the image data transmitted by the output device by electromagnetic induction;
The control device forms one screen by sequentially inputting the image data of each pixel line constituting one screen at a period shorter than the time required for writing pixels for one pixel line by the display device. Each time the image data for a predetermined number of pixel lines smaller than the number of pixel lines to be input is input, the predetermined number of input pixels regardless of whether or not the display device is writing pixels A storage control step of storing image data for lines in image data storage means for storing image data for the predetermined number of pixel lines;
A first determination step of determining whether or not a writing time required for writing the pixels for the predetermined number of pixel lines by the display device has elapsed since the control signal was output;
A display position detecting step in which the control device detects a position where an image composed of image data for the predetermined number of pixel lines stored in the image data storage means is displayed by the display device;
A second determination step in which the control device determines whether or not the control signal for displaying an image at the detected display position has been output;
In the first determination step, the control device determines that the writing time has elapsed since the control signal was output, and the control signal for displaying an image at the detected display position is output. When it is determined in the second determination step that it is not completed, an image constituted by the image data based on the image data for the predetermined number of pixel lines stored in the image data storage unit at that time A control signal output step of outputting the control signal for causing the display device to display the detected display position;
The control method characterized by including. A display device including a display element that displays an image by applying a drive voltage and maintains a display state of the image even after application of the drive voltage is stopped, and for controlling the drive voltage for the display device A control method in a display system comprising: a control device that outputs a control signal based on input image data,
The control device forms one screen by sequentially inputting the image data of each pixel line constituting one screen at a period shorter than the time required for writing pixels for one pixel line by the display device. Each time the image data for a predetermined number of pixel lines smaller than the number of pixel lines to be input is input, the predetermined number of input pixels regardless of whether or not the display device is writing pixels A storage control step of storing image data for lines in image data storage means for storing image data for the predetermined number of pixel lines;
A first determination step of determining whether or not a writing time required for writing the pixels for the predetermined number of pixel lines by the display device has elapsed since the control signal was output;
A display position detecting step in which the control device detects a position where an image composed of image data for the predetermined number of pixel lines stored in the image data storage means is displayed by the display device;
A second determination step in which the control device determines whether or not the control signal for displaying an image at the detected display position has been output;
In the first determination step, the control device determines that the writing time has elapsed since the control signal was output, and the control signal for displaying an image at the detected display position is output. When it is determined in the second determination step that it is not completed, an image constituted by the image data based on the image data for the predetermined number of pixel lines stored in the image data storage unit at that time A control signal output step of outputting the control signal for causing the display device to display the detected display position;
A control signal transmitting step in which the control device transmits the output control signal to the display device by electromagnetic induction;
A control signal receiving step in which the display device receives a control signal transmitted by the control device by electromagnetic induction; and
The control method characterized by including. A display device including a display element that displays an image by applying a drive voltage and maintains a display state of the image even after application of the drive voltage is stopped, and for controlling the drive voltage for the display device A control method in a display system comprising: a control device that outputs a control signal based on input image data,
The control device forms one screen by sequentially inputting the image data of each pixel line constituting one screen at a period shorter than the time required for writing pixels for one pixel line by the display device. Each time the image data for a predetermined number of pixel lines smaller than the number of pixel lines to be input is input, the predetermined number of input pixels regardless of whether or not the display device is writing pixels A storage control step of storing image data for lines in image data storage means for storing image data for the predetermined number of pixel lines;
A first determination step of determining whether or not a writing time required for writing the pixels for the predetermined number of pixel lines by the display device has elapsed since the control signal was output;
A display position detecting step in which the control device detects a position where an image composed of image data for the predetermined number of pixel lines stored in the image data storage means is displayed by the display device;
A second determination step in which the control device determines whether or not the control signal for displaying an image at the detected display position has been output;
In the first determination step, the control device determines that the writing time has elapsed since the control signal was output, and the control signal for displaying an image at the detected display position is output. When it is determined in the second determination step that it is not completed, an image constituted by the image data based on the image data for the predetermined number of pixel lines stored in the image data storage unit at that time A control signal output step of outputting the control signal for causing the display device to display the detected display position;
A drive signal output step in which the control device outputs a drive signal corresponding to the drive voltage to be applied to the display element of the display device based on the output control signal;
A drive signal transmitting step in which the control device transmits the output drive signal to the display device by electromagnetic induction;
A driving signal receiving step in which the display device receives the driving signal transmitted by the control device by electromagnetic induction; and
The control method characterized by including.

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