JP2015215496A - Display device, display method, program, and display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the contents of display easy to see in periodically rewriting a screen of a storage type display part.SOLUTION: A display device 10 detects the position of a stylus pen PE in a predetermined period. When the detected position of the stylus pen PE is within a user interface for scrolling a screen, the display device 10 periodically rewrites display and scrolls the screen. When scrolling the screen, the display device 10 rewrites the display in a period longer than the period for detecting the position of the stylus pen PE.

Description

  The present invention relates to a display device, a display method, a program, and a display system.

  As an invention for suppressing the deterioration of image quality when scroll display is performed on a display having memory, there are inventions disclosed in Patent Documents 1 and 2, for example. The display device disclosed in Patent Literature 1 performs a natural drawing for a specific area by increasing the drawing frame rate of the specific area that the user is paying attention to in comparison with other areas, and allows the user to I try not to make me feel uncomfortable. When entering the scroll mode, the display device disclosed in Patent Document 2 first drives the pixels to a special optical state for scrolling, and then drives the pixels with a special driving waveform for scroll mode.

JP 2007-79146 A Special table 2008-508548 gazette

  In the invention of Patent Document 1, since the frame rate is different between the specific area and other areas when the display is rewritten, the entire display does not appear to scroll during rewriting of the specific area, and the user feels uncomfortable. I remember it. Further, in the invention of Patent Document 2, it is necessary to prepare a special drive waveform for scrolling in addition to the drive waveform for normal display, and it takes time to design the drive waveform.

  The present invention has been made in view of the above-described circumstances, and one of its purposes is to make it easy to see the displayed content when the screen of the memory display unit is periodically rewritten. .

The present invention is a controller that rewrites a memory display unit, a detection unit that detects a user operation at a predetermined cycle, and a screen displayed by the memory display unit, and the rewrite time from the start to the end of the rewrite is A display having a controller that is longer than a predetermined period and an instruction unit that instructs the controller to rewrite a screen in accordance with an operation detected by the detection unit, wherein the instruction time interval is longer than the predetermined period. Providing equipment.
According to the present invention, when the screen of the memory display unit is periodically rewritten, the displayed contents can be easily seen.

In the present invention, the time interval may be longer than the rewriting time.
According to this configuration, since the screen rewriting is newly instructed after the screen rewriting is completed, the displayed content can be easily seen when the screen rewriting is performed periodically.

In the present invention, the controller selects a method for rewriting the screen from a plurality of methods having different rewriting times, and the instruction unit changes the time interval according to the method selected by the controller. It is good also as composition to do.
According to this configuration, even when there are a plurality of screen rewriting methods, instructions for rewriting are given at time intervals according to the rewriting method, so when periodically rewriting the screen of the memory display unit, The displayed content is easier to see.

In the present invention, the detection unit may detect an operation by an indicator, and the instruction unit may instruct the controller to rewrite the screen every time the detection unit detects an operation a predetermined number of times. .
According to this configuration, the time interval of the rewrite instruction can be made longer than the predetermined cycle simply by counting the number of times, compared with the configuration in which the time interval of the rewrite instruction is made longer than the predetermined cycle by measuring the time, The time interval for rewriting instructions can be easily made longer than a predetermined period.

In the present invention, the detection unit detects an operation performed by the indicator performed on the surface of the memory display unit, and the instruction unit detects that the indicator is separated from the surface. When the unit detects the screen, the controller may be instructed to rewrite the screen.
According to this configuration, when the user's operation is finished, the screen is immediately rewritten, so that the screen after the operation can be viewed immediately.

Further, in the present invention, the communication device includes a communication unit that communicates with another device having a memory display unit, and the instruction unit transmits an instruction to rewrite a screen to be displayed to the other device via the communication unit. The time interval for transmitting the rewrite instruction may be longer than the predetermined period.
According to this configuration, the screen can be synchronized with other devices.

Further, in the present invention, the controller has a plurality of methods with different rewriting times as a method of rewriting the screen, and the time interval for transmitting the rewriting instruction depends on the method selected by the controller. It is good also as a structure to change.
According to this configuration, even when there are a plurality of screen rewriting methods, a rewriting instruction is transmitted at a time interval according to the rewriting method. The content displayed in is easier to see.

In the present invention, the detection unit detects an operation performed by the indicator performed on the surface of the memory display unit, and the instruction unit detects that the indicator is separated from the surface. When the unit detects the rewrite instruction, the rewrite instruction may be transmitted to the other device via the communication unit.
According to this configuration, when the user's operation is completed, the screen is immediately rewritten by the other device, so that the screen after the operation can be viewed immediately by the other device.

Further, the present invention is a detection step of detecting a user operation at a predetermined cycle, and a step of rewriting the screen by a controller that rewrites the screen displayed by the memory display unit, and the rewriting time from the start to the end of the rewriting is A step of rewriting longer than the predetermined cycle, and a step of instructing the controller to rewrite the screen in accordance with the operation detected in the detecting step, wherein the time interval of the instruction is longer than the predetermined cycle. Provide a display method.
According to the present invention, when the screen of the memory display unit is periodically rewritten, the displayed contents can be easily seen.

The present invention also provides a controller for detecting a user operation at a predetermined cycle on a computer and a controller for rewriting a screen displayed by the memory display unit, wherein the rewrite time from the start to the end of the rewrite is the predetermined cycle. Instructing a longer controller to perform screen rewriting to the controller in accordance with the operation detected in the detection step, wherein the instruction time interval is longer than the predetermined period. Provide a program.
According to the present invention, when the screen of the memory display unit is periodically rewritten, the displayed contents can be easily seen.

According to the present invention, the position of the surface of the memory display unit is detected at a predetermined cycle, the indicator that outputs the detected position, the memory display unit, and the user's operation based on the coordinates output by the indicator And a controller for rewriting a screen displayed by the memory display unit, wherein a rewrite time from the start to the end of rewriting is longer than the predetermined cycle, and the detection unit detects There is provided a display system comprising: a display device including an instruction unit that instructs the controller to rewrite a screen in response to an operation, and the instruction unit has a time interval of the instruction longer than the predetermined period.
According to the present invention, when the screen of the memory display unit is periodically rewritten, the displayed contents can be easily seen.

The figure which showed the display apparatus 10 which concerns on one Embodiment of this invention. The figure which showed the hardware constitutions of the display apparatus. The figure which illustrated the relationship between the voltage application to a pixel, and a gradation. The figure which showed an example of the content of 1st LUT1061. The figure which showed an example of the content of 2nd LUT1062. The figure which illustrated the gradation change by the 1st method. The figure which illustrated the gradation change by the 2nd method. FIG. 3 is a functional block diagram of the display device 10. The figure which illustrated the screen displayed on the display part. The flowchart which showed the flow of the process which the control part 100 performs. The flowchart which showed the flow of the process which the control part 100 performs. The figure which showed display apparatus 10A, 10B which concerns on 2nd Embodiment of this invention. The functional block diagram of display apparatus 10A, 10B. The flowchart which showed the flow of the process which the control part 100 of 2nd Embodiment performs. The flowchart which showed the flow of the process which the control part 100 of 2nd Embodiment performs.

[First Embodiment]
FIG. 1 is a diagram showing a display device 10 according to an embodiment of the present invention. The display device 10 has an electrophoretic display device and has a function of displaying a document corresponding to a document file. The format of the document file that can be processed by the display device 10 is, for example, PDF (Portable Document Format), but is not limited to this format, and may be another format.
The display device 10 includes a sensor that detects the coordinates of the stylus pen PE in contact with the image display surface at a predetermined cycle. The display device 10 specifies a user instruction based on the coordinates detected by the sensor and the displayed user interface image, and executes a process according to the instruction from the user.

(Configuration of display device 10)
FIG. 2 is a diagram illustrating a hardware configuration of the display device 10. The display unit 107 includes electrophoretic electronic paper in which pixels are arranged in a plurality of rows and a plurality of columns, and displays a multi-tone image (grayscale). The electronic paper includes a plurality of microcapsules in which negatively charged white electrophoretic particles and positively charged black electrophoretic particles are accommodated. The microcapsule is sandwiched between a transparent common electrode on the display surface side of the electronic paper and a pixel electrode provided for each pixel on the back side. In this embodiment, the potential of the common electrode is constant, and positively charged black electrophoretic particles are displayed when a positive voltage is applied to the pixel electrode with respect to the constant potential of the common electrode. When moving to the surface side and a negative voltage is applied to the pixel electrode with respect to the potential of the common electrode, the negatively charged white electrophoretic particles move to the display surface side. The display unit 107 is an example of a display unit that holds a displayed image without supplying power, that is, a display unit that includes a display area having storage properties. The display unit 107 may be an electronic powder (registered trademark) type electronic paper.

  FIG. 3 is a diagram illustrating the relationship between the voltage application to the pixel electrode of the display unit 107 and the gradation of the pixel after the voltage application. In FIG. 3, the horizontal axis represents the number of frames to which a voltage is applied, and the vertical axis represents the gradation of the pixel. A “frame” is a unit period of voltage application, and its length is predetermined in this embodiment. The lowest gradation in the display unit 107 corresponds to black, and the highest gradation corresponds to white.

  For example, consider an example in which voltage application to the pixel is started in order to change the gradation of the pixel from the lowest gradation state to the highest gradation state. First, the state in which the gradation of the pixel is black before voltage application is represented by a point P10. When a predetermined first voltage (for example, −15 V) is applied to the pixel electrode for a period of one frame from here, the white electrophoretic particles move to the display surface side, and the gradation of the pixel becomes a little brighter and transitions to the point P11. . Further, when the first voltage is applied for a period of one frame, the gradation of the pixel is further brightened and transitions to the point P12. Similarly, when the first voltage is applied, the gradation of the pixel changes in the order of point P13 to point P26. Point P26 corresponds to the highest gradation, that is, white. In this example, when the first voltage is applied over 15 frames, the gradation of the pixel transitions from black to white.

  Next, consider an example in which voltage application to the pixel is started in order to change the gradation of the pixel from the highest gradation state to the lowest gradation state. First, a state where the gradation of the pixel is white before the voltage application is represented by a point P30. When a predetermined second voltage (for example, +15 V) is applied to the pixel electrode during the period of one frame from the state of the point P30, the black electrophoretic particles move to the display surface side, and the gray level of the pixel becomes a little darker at the point P31. Transition. Further, when the second voltage is applied for a period of one frame, the gradation of the pixel becomes darker and the point P32 is changed. Similarly, when the second voltage is applied, the gradation of the pixel changes in the order of point P33 to point P45. Point P45 corresponds to the lowest gradation, that is, black. In this example, when the second voltage is applied for 15 frames, the gradation of the pixel changes from white to black.

  As shown in FIG. 3, the pixels of the display unit 107 pass through different optical states when transitioning from white to black and when transitioning from black to white. That is, by applying the first voltage for 15 frames and the application of the second voltage for 15 frames, the gradation of the pixel returns from black to white to black again.

  The sensor 103 is a sensor that detects the coordinates of the tip of the stylus pen PE and the writing pressure. Note that the stylus pen PE and the sensor 103 of the present embodiment may be applied with a known configuration such as a position indicator and a position detection device disclosed in Japanese Patent Application Laid-Open No. 2010-117943. The sensor 103 periodically detects the coordinates of the tip of the stylus pen PE on the display area of the display unit 107 and the pressure (writing pressure) applied to the tip of the stylus pen PE. The period at which the sensor 103 performs the detection is in the range of several msec to several tens of msec, and is 10 msec in this embodiment. The sensor 103 outputs a set of first data indicating the detected coordinates and second data indicating the detected pressure to the control unit 100.

  The buffer 105 includes a first storage area 105A and a second storage area 105B. The first storage area 105 </ b> A is an area for storing screen data to be displayed on the display unit 107. The first storage area 105 </ b> A has a storage area for each pixel of the display unit 107, and data representing the gradation value of the pixel is written by the control unit 100 in the storage area corresponding to each pixel. The second storage area 105B is an area for storing screen data displayed on the display unit 107 before the screen is rewritten. The second storage area 105B has a storage area for storing the gradation value of the pixel for each pixel of the display unit 107, and data indicating the gradation value of the pixel is stored in the storage area of each pixel. Written by.

  The controller 106 is a circuit that drives the display unit 107. In this embodiment, the controller 106 has a first method for displaying two gradations after rewriting and a second method capable of displaying 16 gradations after rewriting as a driving method of the display unit 107, and a region to be rewritten. The first method and the second method are properly used according to the contents of Whether to use the first method or the second method is selected by the user. For example, the user uses the first method and the second method depending on the content of the document to be displayed. When displaying a text-only document such as an electronic book, the user selects the first method of displaying with two gradations, and when displaying a document including figures and photographs, the user selects 16 gradations. To select the second method of displaying. Further, the controller 106 has an LUT (Look Up Table) for driving by the first method or the second method. The LUT is a table storing information for specifying a voltage to be applied in each frame, and includes a first LUT 1061 corresponding to the first method and a second LUT 1062 corresponding to the second method.

  FIG. 4 is a diagram illustrating an example of the contents of the first LUT 1061, and FIG. 5 is a diagram illustrating an example of the contents of the second LUT 1062. In these tables, values of 0 to 15 in the columns of the current gradation and the next gradation represent pixel gradation values. In these tables, “+” indicates that the voltage applied to the pixel electrode in one frame period is a positive voltage (+15 V), and “−” indicates that the voltage applied to the pixel electrode in one frame period. It shows that the voltage is a negative voltage (−15V). In addition, “0” in the frame number column indicates that the voltage applied to the pixel electrode has the same potential as the common electrode.

  The controller 106 acquires the data stored in the buffer 105, and based on the acquired data and the LUT, for the predetermined number of frames, the first voltage (for example, −15V), the second voltage (for example, + 15V), and Any voltage of discharge (zero volt) is applied to the pixel electrode to drive each pixel. The pattern of the voltage applied to the pixel electrode over a plurality of frames in order to change the gradation of the pixel differs depending on the gradation of the pixel before rewriting and the gradation to be displayed next. It can be said that the pattern of the voltage applied to the pixel electrode indicates the time change of the voltage to be applied. In that sense, the pattern of the applied voltage is hereinafter referred to as a “drive waveform”.

  FIG. 6 is a diagram exemplifying gradation change when the gradation of the pixel is set to the lowest gradation or the highest gradation using the first method in the present embodiment. In FIG. 6, the horizontal axis indicates the number of frames, and the vertical axis indicates the gradation of the pixel. When the controller 106 rewrites the gradation of the pixel by the first method, first, the controller 106 binarizes the data acquired from the first storage area 105A. Specifically, when the value of the data acquired from the first storage area 105A is 0 to 7, the value of the acquired data is 0, and when the value is 8 to 15, the value of the acquired data is 15.

  When the data value after binarization is 0, the controller 106 refers to the table of FIG. 4A and applies a voltage to the pixel electrode. For example, for a certain pixel, when the data value stored in the second storage area 105B is 15 and the data value after binarization is 0, the controller 106 displays the table in FIG. Referring to the row where the current gradation is “15”, a positive voltage is applied from the first frame to the fifteenth frame, and discharge is performed from the sixteenth frame to the thirtieth frame. As a result, as indicated by “●” in FIG. 6, the gradation of the pixels is gradually darkened from the 1st frame to the 15th frame, and the minimum gradation is maintained after the 16th frame.

  In addition, when the data value after binarization is 15, the controller 106 applies a voltage to the pixel electrode with reference to the table of FIG. For example, for a certain pixel, when the data value stored in the second storage area 105B is 0 and the data value after binarization is 15, the controller 106 displays the table in FIG. Referring to the row where the current gradation is “0”, discharge is performed from the first frame to the 15th frame, and a negative voltage is applied from the 16th frame to the 30th frame. As a result, as indicated by “□” in FIG. 6, the minimum gradation is maintained from the first frame to the 15th frame, and the gradation of the pixels is sequentially brightened from the 16th frame to the 30th frame.

  Next, FIG. 7 is a diagram illustrating the gradation change when the gradation of the pixel is rewritten using the second method in the present embodiment. In FIG. 7, the horizontal axis indicates the number of frames, and the vertical axis indicates the gradation of the pixel. When rewriting the gradation of a pixel by the second method, the controller 106 first acquires data from the first storage area 105A and the second storage area 105B. The controller 106 applies a voltage to the pixel electrode with reference to the table of FIG. 5A from the first frame to the 30th frame, and from FIG. 5B to the 45th frame. A voltage is applied to the pixel electrode with reference to the table.

  For example, for a certain pixel, when the value of data stored in the second storage area 105B is 15 and the value of data stored in the first storage area 105A is 0, that is, the gradation of the pixel is set. In the case of rewriting from white to black, the controller 106 applies a positive voltage from the first frame to the 15th frame with reference to the row where the current gradation is “15” in the table of FIG. A negative voltage is applied from the 16th frame to the 30th frame. Further, from the 31st frame to the 45th frame, the controller 106 applies a positive voltage with reference to the row where the next gradation is “0” in the table of FIG. 5B. As a result, as indicated by “●” in FIG. 7, the gradation of the pixels is gradually darkened from the 1st frame to the 15th frame, and the gradation of the pixels is lightened from the 16th frame to the 30th frame. Until the frame, the gradation of the pixels becomes progressively darker.

  Further, for example, for a certain pixel, when the value of data stored in the second storage area 105B is 15, and the value of data stored in the first storage area 105A is 7, that is, before rewriting. When rewriting the gradation of a pixel that is white to a halftone, the controller 106 refers to the row where the current gradation is “15” in the table of FIG. 5A, and has positive polarity from the first frame to the 15th frame. The negative voltage is applied from the 16th frame to the 30th frame. Further, the controller 106 refers to the row where the next gradation is “7” in the table of FIG. 5B, applies a positive voltage from the 31st frame to the 38th frame, and from the 39th frame to the 3rd frame. Discharge up to 45 frames. As a result, as shown in FIG. 7, the gradation changes up to the 38th frame in the same manner as when the pixel gradation is rewritten from white to black. The halftone is maintained.

  Comparing the driving of the pixel by the first method and the driving of the pixel by the second method, as shown in FIGS. 6 and 7, the driving waveform in the first method has the second number of frames for changing the gradation. Since there are fewer methods, the first method rewrites the screen faster than the second method.

  The storage unit 102 has a nonvolatile memory and stores a document file. The storage unit 102 also stores an application program A1 (hereinafter referred to as a first application A1) that displays a document corresponding to the document file.

  The operation unit 101 has a plurality of buttons for operating the display device 10. The communication unit 108 is a communication interface that performs wireless communication. The communication unit 108 performs communication in accordance with a wireless LAN (Local Area Network) communication standard, and transmits information to other devices and receives information transmitted from other devices.

  The control unit 100 is a microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). When the CPU reads the program stored in the ROM and executes the read program using the RAM as a work area, the operating system of the display device 10 operates and the application program can be executed.

  The operating system generates an event related to the operation of the pen based on the second data sent from the sensor 103. For example, when the content of the second data changes from no contact to contact, the operating system issues a pen touch event notifying that the stylus pen PE has touched the display unit 107, and the content of the second data is contact When there is no contact, a pen release event is issued to notify that the stylus pen PE has left the display unit 107. In addition, when the operating system has contact with both the content of the second data newly sent from the sensor 103 and the content of the second data sent immediately before the newly sent second data A pen contact event is issued to notify that the stylus pen PE is in contact. Events issued by the operating system are sent to the application program.

  In the display device 10 in which the operating system is operating, various functions are realized by application programs. For example, when the control unit 100 executes the first application A1, it is possible to display a document corresponding to a document file stored in the storage unit 102 and to scroll the displayed document.

FIG. 8 is a diagram illustrating a configuration of functions according to the present embodiment.
The detection unit 201 detects a user operation based on the user interface displayed on the display unit 107, the event sent from the operating system OS, and the first data. When the stylus pen PE touches the display surface of the display unit 107, an event is sent from the operating system at a predetermined cycle. Therefore, the detection unit 201 performs a user operation at a predetermined cycle, that is, the sensor 103 detects the coordinates of the stylus pen PE and the like. Detection is performed at a predetermined cycle for detecting pen pressure.
The instruction unit 202 instructs the controller 106 to rewrite the screen. When the first method is selected as the driving method for the display unit 107, the instruction unit 202 outputs a first instruction for instructing the display unit 107 to be driven by the first method to the controller 106. When the second method is selected as the driving method 107, a second instruction that instructs the display unit 107 to be driven by the second method is output to the controller 106.
The buffer control unit 203 copies the data stored in the first storage area 105A to the second storage area 105B. Further, the buffer control unit 203 rasterizes the screen displayed on the display unit 107 based on the page data to be displayed, and stores the gradation value data (gradation data) of each pixel in the first storage area 105 </ b> A of the buffer 105. Write to.

(Operation example of embodiment)
Next, an operation example of the present embodiment will be described with reference to FIGS.
First, an operation example when a document is displayed on the display unit 107 will be described. When the user of the display device 10 performs an operation of opening a document file stored in the storage unit 102, the first application A1 acquires the document file from the storage unit 102. The first application A1 copies the data stored in the first storage area 105A to the second storage area 105B. The first application A1 rasterizes the screen of the page displayed on the display unit 107 based on the document file. Here, when the number of gradations that can be displayed on the screen to be displayed is 16, the first application A1 performs a color reduction process, and changes the gradation data value of the pixels constituting the displayed page from the lowest gradation value to the highest value. Set to one of the gradation values. When rasterization is completed, the first application A1 writes gradation value data (gradation data) of each pixel into the first storage area 105A.

  Next, the first application A1 instructs the controller 106 to rewrite the image. Here, when the first application A1 has selected the first method as the driving method of the display unit 107, the first application A1 outputs a first instruction for instructing the driving by the first method to the controller 106, and the display unit When the second method is selected as the driving method 107, a second instruction for instructing driving by the second method is output to the controller 106.

When the controller 106 acquires the first instruction, the controller 106 drives the display unit 107 by the first method based on the gradation data written in the first storage area 105A and the second storage area 105B and the first LUT 1061. Here, since the controller 106 drives the pixels using the first LUT 1061, the screen of the display unit 107 is completely rewritten in 30 frames.
On the other hand, when acquiring the second instruction, the controller 106 drives the display unit 107 by the second method based on the gradation data written in the first storage area 105A and the second storage area 105B and the second LUT 1062. Here, since the controller 106 drives the pixels using the second LUT 1062, the screen of the display unit 107 is completely rewritten in 45 frames. When the rewriting of the screen of the display unit 107 is completed, for example, as illustrated in FIG. 9, a document page and a scroll bar B1 for scrolling the document are displayed.

  Next, an operation example when scrolling the displayed document will be described. When the user scrolls the document displayed on the display unit 107, the user brings the stylus pen PE into contact with the position of the scroll bar. When the stylus pen PE comes into contact with the scroll bar B1, the sensor 103 that periodically detects the coordinates detects the second data whose content is in contact at the timing of detecting the coordinates and the stylus pen PE. First data indicating coordinates is output.

  The operating system acquires the first data and the second data. When the operating system acquires the second data whose content is contact, the operating system confirms the content of the second data acquired immediately before on the time axis from the acquired second data. The operating system issues a pen touch event when the content of the second data acquired immediately before on the time axis is no contact, and issues the pen touch event and the acquired first data to the first application A1. send.

  The first application A1 acquires a pen touch event and first data sent from the operating system. When the coordinates indicated by the first data acquired together with the pen touch event are the coordinates of the upward arrow part or the downward arrow part of the scroll bar B1, the first application A1 detects an operation for instructing scrolling, The process shown in FIG. 10 is executed.

  First, the first application A1 executes a process of scrolling the screen (step SA1). Specifically, first application A1 first copies the data stored in first storage area 105A to second storage area 105B. When the coordinates indicated by the first data acquired together with the pen contact event are the coordinates of the upward arrow portion of the scroll bar B1, the first application A1 rasterizes a screen obtained by scrolling the displayed screen downward by a predetermined amount. Then, the gradation value data (gradation data) of each pixel is written into the first storage area 105A. On the other hand, when the coordinates indicated by the first data acquired together with the pen contact event are the coordinates of the downward arrow part of the scroll bar B1, the first application A1 scrolls the displayed screen upward by a predetermined amount. Are rasterized, and data of gradation values (gradation data) of each pixel is written into the first storage area 105A.

Next, the first application A1 instructs the controller 106 to rewrite the image. Here, when the first application A1 selects the first method as the driving method of the display unit 107, the first application A1 outputs the first instruction to the controller 106 and selects the second method as the driving method of the display unit 107. If so, the second instruction is output to the controller 106.
The controller 106 starts driving the pixels according to the instruction sent from the first application A1. Note that in both the first method and the second method, it takes a time of several hundreds msec from the start to the end of pixel driving, and the second method requires a larger number of frames for driving, so the driving from the start to the end is completed. It takes longer time than the first method.

Next, when the first application A1 selects the first method as the driving method of the display unit 107 (YES in step SA2), the first application A1 sets wait_time, which is a display rewrite wait time, to T1 (step SA3). Here, T1 is a time (rewrite time) required from the start of display rewriting to the end by the controller 106 in the present embodiment, and is 300 msec in the present embodiment. Yes.
In addition, when the second method is selected as the driving method of the display unit 107 (NO in step SA2), the first application A1 sets wait_time that is a display update waiting time to T2 (step SA4). Here, T2 is the time (rewrite time) required from the start of display rewriting to the end by the controller 106 in the second embodiment, and is 450 msec in the present embodiment. .

When the setting of the waiting time is completed, the first application A1 sets the pen contact event skip count Sk (step SA5). The skip number Sk is obtained using the wait_time of the waiting time and the input_time of the cycle in which the sensor 103 detects the coordinates of the stylus pen PE, and the first application A1 sets the skip number Sk = wait_time / input_time. Note that when the second method is selected, the wait_time value is larger than when the first method is selected. Therefore, when the second method is selected, skipping is performed when the first method is selected. The value of the number Sk increases.
Next, the first application A1 initializes a counter cnt that counts the number of acquisition times of the pen contact event, and sets the value of the counter cnt to 0 (step SA6).

When the user keeps the stylus pen PE in contact with the display surface and the sensor 103 detects the coordinates of the stylus pen PE next time, if the stylus pen PE is in contact with the display surface, the sensor 103 The data and the second data whose content is contact are output. The operating system acquires the second data and the first data output from the sensor 103. When the operating system acquires the second data whose content is contact, the pen issue event is issued when the content of the second data acquired immediately before on the time axis is contacted. The issued pen contact event and the acquired first data are sent to the first application A1.
The first application A1 that has acquired the pen contact event performs scrolling when the coordinates indicated by the first data acquired together with the pen contact event are the coordinates of the upward arrow portion or the downward arrow portion of the scroll bar B1. The instructed operation is detected, and the process shown in FIG. 11 is executed.

First, the first application A1 determines whether the value of the counter cnt is equal to or greater than the value of the skip count Sk. If the value of the counter cnt is less than the value of the skip count Sk (NO in step SB1), the first application A1 increments the value of the counter cnt (step SB2).
Thereafter, if the user keeps the stylus pen PE in contact with the display surface without moving, the first application A1 periodically acquires the pen contact event and the first data, and increments the value of the counter cnt. I do. Here, until the value of the counter cnt becomes equal to or greater than the value of the number of skips Sk (until the driving of the pixels by the processing of step SA1 is completed), the first application A1 Even if the coordinates or the downward arrow portion is continuously pressed with the stylus pen PE, the first instruction or the second instruction is not sent to the controller 106, so that the driving of the pixel started in step SA1 is continued.

  Furthermore, if the user keeps the stylus pen PE in contact with the display surface without moving the first application A1, the first application A1 acquires the pen contact event and the first data. If the value of the counter cnt is equal to or greater than the value of the skip count Sk (YES in step SB1), the first application A1 initializes the value of the counter cnt to 0 (step SB3) and executes a process of scrolling the screen. (Step SB4). Here, the scrolling direction of the screen is downward when the coordinates indicated by the first data acquired together with the pen contact event are the upward arrow portion of the scroll bar B1, and the direction of the first data acquired together with the pen touch event is displayed. When the indicated coordinate is the downward arrow portion of the scroll bar B1, the direction is the upward direction.

  Thereafter, if the user keeps the stylus pen PE in contact with the display surface without moving the first application A1, the first application A1 displays the screen until the value of the initialized counter cnt becomes equal to or greater than the value of the skip number Sk. If the value of the counter cnt is equal to or greater than the value of the skip number Sk without executing the scrolling process, the process of scrolling the screen is executed.

For example, when it is configured to execute a process of scrolling the screen every time a pen contact event is acquired (that is, every 10 msec), the controller 106 is in a state of rewriting the screen without completing driving of pixels. Thus, the first instruction or the second instruction is newly acquired. In this configuration, since the screen rewriting is newly started when the screen rewriting has not been completed, the screen being rewritten continues to be displayed on the display unit 107, and the user can display which part of the document. It is difficult to display the page you want to see because you do not know what is being done.
On the other hand, in this embodiment, even if the user continues to press the upward arrow portion or the downward arrow portion of the scroll bar B1 with the stylus pen PE, the value of the counter cnt becomes equal to or greater than the skip number Sk value. That is, the screen is not scrolled until the controller 106 finishes driving the pixel, and after the pixel drive is finished, the next scrolled screen is started to be written. It is possible to determine whether the page has been viewed, and it is easy to display a desired page.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
FIG. 12 is a diagram showing an apparatus constituting the display system 1 according to an embodiment of the present invention. The display system 1 according to the second embodiment of the present invention includes a display device 10A and a display device 10B. The hardware configuration of the display devices 10A and 10B is the same as that of the display device 10 of the first embodiment. However, the programs executed by the display devices 10A and 10B are different. In the following description, description of the same configuration as that of the first embodiment will be omitted, and differences from the first embodiment will be described.

  In the present embodiment, the display devices 10A and 10B have a function of synchronizing screens to be displayed. When the display device 10A and the display device 10B communicate with each other, the screen displayed on the display device 10A and the screen displayed on the display device 10B are the same screen.

FIG. 13 is a diagram illustrating a functional configuration of the display devices 10A and 10B.
The instruction unit 202A has the same function as the instruction unit 202 of the first embodiment. The instruction unit 202A transmits a synchronization instruction for instructing screen synchronization and a scroll instruction for instructing screen scrolling to another display device via the communication unit. In addition, when the communication unit 108 receives the synchronization instruction, the instruction unit 202A acquires the synchronization instruction received by the communication unit 108, and outputs the first instruction or the second instruction to the controller 106 according to the acquired synchronization instruction. In addition, when the communication unit 108 receives a scroll instruction for instructing scrolling of the screen, the instruction unit 202A acquires the scroll instruction received by the communication unit 108, and determines the first instruction or the first instruction to the controller 106 according to the acquired scroll instruction. 2 instructions are output.

Next, an operation example of the second embodiment will be described. In the following description, an operation example will be described on the assumption that the same document file is stored in the display devices 10A and 10B.
First, when the user of the display device 10A performs an operation of opening a document file stored in the storage unit 102, the display device 10A is configured to scroll a document page and a document in the display device 10A as in the first embodiment. A scroll bar B1 is displayed.
When the display of the document is completed, the display device 10A displays the document file name of the displayed document, the page number of the displayed document, and the driving method (first method or second method) selected by the display device 10A. A synchronization instruction for instructing screen synchronization is transmitted to the display device 10B. Here, the synchronization instruction instructs screen synchronization. However, since synchronizing the screen means rewriting the screen of the display device 10B, the synchronization instruction is rewriting that instructs the display device 10B to rewrite the screen. It is also an instruction.
Upon receiving the synchronization instruction, the display device 10B acquires the document file having the document file name included in the synchronization instruction from the storage unit 102, rasterizes the page with the page number included in the synchronization instruction, and outputs the synchronization instruction. The page is displayed on the display unit 107 by the driving method indicated by the included information. Here, in the display device 10B, the same screen as that displayed on the display device 10A is displayed.

  Next, when the user of the display device 10A brings the stylus pen PE into contact with the position of the scroll bar, the display device 10A executes the process shown in FIG. Since the processes from step SA1 to step SA6 are the same as those in the first embodiment, the description thereof is omitted. When the process of step SA6 is completed, the display device 10A displays the document file name of the displayed document, the scroll direction, and the driving method (first method or second method) selected by the display device 10A. And a scroll instruction for instructing scrolling of the screen is transmitted to the display device 10B (step SA7). The scroll instruction instructs to scroll the screen. However, since scrolling the screen means rewriting the screen of the display device 10B, the scroll instruction is also a rewriting instruction for instructing the display device 10B to rewrite the screen. . Here, the scroll direction included in the scroll instruction is downward when the coordinates indicated by the first data acquired together with the pen touch event are the upward arrow portion of the scroll bar B1, and the first data acquired together with the pen touch event. When the coordinate indicated by is the downward arrow part of the scroll bar B1, it is the upward direction.

  When receiving the scroll instruction, the display device 10B executes a process of scrolling the screen. Specifically, first, the display device 10B copies the data stored in the first storage area 105A to the second storage area 105B. When the scroll direction included in the scroll instruction is the upward direction, the display device 10B rasterizes a screen obtained by scrolling the displayed screen upward by a predetermined amount, and the gradation value data (gradation level) of each pixel. Data) is written to the first storage area 105A. On the other hand, when the scroll direction included in the scroll instruction is the downward direction, the display device 10B rasterizes a screen obtained by scrolling the displayed screen downward by a predetermined amount, and the gradation value data ( (Gradation data) is written into the first storage area 105A.

  Next, in the display device 10B, the display unit 107 is driven by the driving method indicated by the information included in the scroll instruction. Here, in the display device 10B, since the screen is scrolled in the same manner as the display device 10A, the same screen as the screen displayed on the display device 10A is displayed.

  In the display device 10A, when the user keeps the stylus pen PE in contact with the display surface and the sensor 103 detects the coordinates of the stylus pen PE next time, if the stylus pen PE is in contact with the display surface, The first application A1 of the device 10A acquires a pen contact event. The first application A1 that has acquired the pen contact event performs scrolling when the coordinates indicated by the first data acquired together with the pen contact event are the coordinates of the upward arrow portion or the downward arrow portion of the scroll bar B1. An operation to be instructed is detected, and the process shown in FIG. 15 is executed. Since the processing from step SB1 to step SB4 is the same as that in the first embodiment, the description thereof is omitted.

  After determining YES in step SB1, display device 10A transmits a scroll instruction to display device 10B when the processing in step SB4 ends (step SB5). Here, the scroll direction included in the scroll instruction is downward when the coordinates indicated by the first data acquired together with the pen contact event are the upward arrow portion of the scroll bar B1, and the first direction acquired together with the pen touch event. When the coordinate indicated by the data is the downward arrow portion of the scroll bar B1, the direction is upward. When receiving the scroll instruction, the display device 10B executes a process of scrolling the screen in the same manner as described above.

  In the present embodiment, even if the user continues to press the upward arrow portion or the downward arrow portion of the scroll bar B1 with the stylus pen PE in the display device 10A, the controller 106 drives the pixels in the display device 10B. The screen is not scrolled until it is finished, and after the pixel drive is finished, the next scrolled screen starts to be written, so the user can determine which part of the document is displayed. It becomes easy.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the present invention may be implemented by modifying the above-described embodiment as follows. In addition, you may combine each of embodiment mentioned above and the following modifications.

In the embodiment described above, when the stylus pen PE is moved away from the display unit 107, the operation system issues a pen release event. When a pen release event is issued, the first application A1 may execute a process of scrolling the screen even if the value of the counter cnt is less than the value of the skip count Sk.
In the second embodiment, when a pen release event is issued in the display device 10A, a scroll instruction is transmitted to the display device 10B even if the value of the counter cnt is less than the value of the skip number Sk. Good.

In the embodiment described above, there are the first method and the second method as the driving method of the display unit 107, but the method of driving the display unit 107 is not limited to these methods. For example, the display unit 107 may be driven by a driving method in which the number of frames for changing the gradation is smaller than that in the first method or a driving method in which the number of frames is larger than that in the second method.
When the first application A1 drives the display unit 107 with a driving method having a smaller number of frames than the first method, the first application A1 determines the driving method after step SA1 and sets wait_time to a time shorter than T1. In addition, when the first application A1 drives the display unit 107 with a driving method having a larger number of frames than the second method, the first application A1 determines the driving method after step SA1 and sets wait_time to a time longer than T2.

In the embodiment described above, the wait_time of the waiting time is the time taken from the start of the rewrite of the display to the end of the display by the controller 106, but is not limited to the time taken from the start to the end. The time may be shorter than the time taken from the start to the end by a predetermined time (for example, a time shorter by several frames).
When wait_time is shorter than the time taken from the start to the end by several frames, the screen rewriting is not finished, but the screen rewriting is almost finished, so the user can see which part of the document is displayed. Can be determined.

  In the above-described embodiment, the processing of FIGS. 10 and 11 is performed when scrolling the document to be displayed. However, when the display is rewritten, the same processing as in the above-described embodiment may be performed. Good. For example, the processing of Step SA1 and Step SB4 may be processing for returning the displayed page by one page or advancing by one page.

In the above-described embodiment, the value of the counter cnt is incremented, and the screen is scrolled when the value exceeds the value of the skip count Sk. However, the present invention is not limited to this configuration. For example, in step SA6, the value of the skip number Sk is substituted for the counter cnt. In step SB1, it is determined whether the value of the counter cnt is 0. If not, the value of the counter cnt is decremented in step SB2. If the value of the counter cnt is 0, the value of the counter cnt is set as the value of the skip number Sk in step SB3.
Even in this configuration, the screen is not scrolled until the controller 106 finishes driving the pixels. After the pixel driving is finished, the user starts writing the next scrolled screen. It is possible to determine whether the portion is displayed, and it is easy to display a page to be viewed.

In the above-described embodiment, the operation is performed with the stylus pen PE that is an example of the indicator, but the indicator is not limited to the stylus pen PE. For example, in the configuration in which the coordinate indicated by the indicator is detected by a capacitance method, the indicator may be a finger.
The method for detecting coordinates may be a code detection method in which a code is provided on the display surface, and the code is detected by a sensor provided on the pen, thereby detecting the coordinate in the pen. When this pen is used, the pen transmits coordinates to the display device 10 at a predetermined cycle. Further, the display device 10 acquires the coordinates transmitted by the pen at a predetermined cycle.
In the display device 10, the coordinate acquired immediately before on the time axis is outside the coordinate of the upward arrow portion or the downward arrow portion of the scroll bar B1, and the newly acquired coordinate is the scroll bar B1. If it is within the coordinates of the upward arrow portion or the downward arrow portion, the processing shown in FIG. 10 is executed. In this modification, input_time used for calculating the skip number Sk in step SA5 is Let it be a cycle for acquiring coordinates from the pen.
Further, the display device 10 has the coordinates acquired immediately before on the time axis within the coordinates of the upward arrow portion or the downward arrow portion of the scroll bar B1, and the newly acquired coordinates are also included in the scroll bar. If it is within the coordinates of the upward arrow portion or the downward arrow portion of B1, the processing shown in FIG. 11 is executed.
Also in this modification, the screen can be scrolled similarly to the above-described embodiment.

  In the embodiment described above, the screen is scrolled using the stylus pen PE, but the screen may be scrolled by continuously pressing the button of the operation unit 101.

In the embodiment described above, the screen is scrolled in accordance with the operation on the scroll bar B1, but the operation for performing the scrolling is not limited to this operation, and may be another operation. For example, when an operation for moving the stylus pen PE in contact with the document is performed, the screen may be scrolled in the direction in which the stylus pen PE has moved. According to this configuration, the screen can be moved not only in the vertical direction but also in the horizontal direction and the oblique direction.
Further, when the flick operation is performed with the stylus pen PE or the finger, the screen may be scrolled in the direction in which the stylus pen PE or the finger moves.

In the above-described embodiment, only one of the first voltage and the second voltage is applied in one frame period, but the first voltage and the second voltage are applied in one frame period. It is good also as a structure of the bipolar drive which can apply both voltages.

  The program executed by the display device 10 includes a magnetic recording medium (magnetic tape, magnetic disk (HDD (Hard Disk Drive), FD (Flexible Disk), etc.)), optical recording medium (optical disk, etc.), magneto-optical recording medium, and semiconductor memory. The program may be provided and installed in a state of being stored in a computer-readable recording medium. Alternatively, the program may be downloaded and installed via a communication line.

DESCRIPTION OF SYMBOLS 10, 10A, 10B ... Display apparatus, 100 ... Control part, 101 ... Operation part, 102 ... Storage part, 103 ... Sensor, 105 ... Buffer, 105A ... First storage area, 105B ... Second storage area, 106 ... Controller, DESCRIPTION OF SYMBOLS 107 ... Display part, 108 ... Communication part, 1061 ... 1st LUT, 1062 ... 2nd LUT, 201 ... Detection part, 202, 202A ... Instruction part, 203 ... Buffer control part, OS ... Operating system, PE ... Stylus pen

Claims (11)

A memory display;
A detection unit for detecting a user operation at a predetermined cycle;
A controller that rewrites a screen displayed by the memory display unit, and a rewrite time from the start to the end of rewrite is longer than the predetermined period,
An instruction unit for instructing the controller to rewrite a screen according to an operation detected by the detection unit, wherein the instruction unit has a time interval longer than the predetermined period;
A display device.   The display device according to claim 1, wherein the time interval is equal to or longer than the rewriting time. The controller selects a method for rewriting the screen from a plurality of methods with different rewriting times,
The display device according to claim 1, wherein the instruction unit changes the time interval according to a method selected by the controller. The detection unit detects an operation by an indicator,
The display device according to any one of claims 1 to 3, wherein the instruction unit instructs the controller to rewrite a screen every time the detection unit detects an operation a predetermined number of times. The detection unit detects an operation by the indicator performed on the surface of the memory display unit,
The display device according to claim 4, wherein the instruction unit instructs the controller to rewrite a screen when the detection unit detects that the indicator is separated from the surface. A communication unit that communicates with another device having a memory display unit;
The instruction unit transmits an instruction to rewrite a screen to be displayed to the other device via the communication unit,
The display device according to claim 1, wherein a time interval for transmitting the rewrite instruction is equal to or longer than the predetermined period. The controller has a plurality of methods with different rewriting times as a method of rewriting the screen,
The display device according to claim 6, wherein a time interval for transmitting the rewrite instruction is changed according to a method selected by the controller. The detection unit detects an operation by the indicator performed on the surface of the memory display unit,
The said instruction | indication part transmits the said rewriting instruction | indication to the said other apparatus via the said communication part, when the said detection part detects that the said indicator left | separated from the said surface. Display device. A detection step for detecting a user operation at a predetermined cycle;
A controller that rewrites the screen displayed by the memory display unit rewrites the screen, and a rewrite step in which the rewrite time from the start to the end of the rewrite is longer than the predetermined period,
Instructing the controller to rewrite the screen in accordance with the operation detected in the detection step, and a control step in which the time interval of the instruction is longer than the predetermined period;
Display method. On the computer,
A detection step for detecting a user operation at a predetermined cycle;
A controller that rewrites the screen displayed by the memory display unit, and the controller rewrites the screen from the start to the end of the rewrite longer than the predetermined period. A step of instructing rewriting, wherein an instruction step in which the time interval of the instruction is longer than the predetermined period;
A program for running An indicator that detects the position of the surface of the memory display unit at a predetermined cycle and outputs the detected position;
A memory display;
A detection unit that detects a user operation at a predetermined period based on the coordinates output by the indicator;
A controller that rewrites a screen displayed by the memory display unit, and a rewrite time from the start to the end of rewrite is longer than the predetermined period,
An instruction unit for instructing the controller to rewrite a screen according to an operation detected by the detection unit, wherein the instruction unit has a time interval longer than the predetermined period;
A display device comprising:
A display system comprising:

Images