JP4946915B2 - Information input display device - Google Patents

Description

  The present invention relates to an information input display device, and more particularly to an information input display device capable of handwriting input.

  In recent years, various types of portable display terminals capable of direct handwriting input using a coordinate input device such as a touch pen on a GUI screen, such as a tablet PC and a PDA (Personal Digital Assistant), have been studied. This portable display terminal is used by inputting and saving graphics such as characters and illustrations by handwriting on a character screen or a blank screen.

  By the way, such a portable display terminal normally uses a battery as its power source. For this reason, it is desired to reduce power consumption and extend usable time.

Therefore, in order to meet such a demand, a handwritten area for inputting image information by handwriting and a touch area for inputting by pressing a predetermined area are provided, and the sampling cycle of input coordinates in each area is different. There is known a method for reducing the power consumption by making them (see, for example, Patent Document 1). Specifically, the sampling period is not fixed, the sampling period is shortened in the handwritten area, while it is increased in the touch area. That is, the power consumption related to the sampling operation is reduced by setting the necessary sampling period according to the input mode performed in each region.
JP 10-232741 A

  As described above, the method described in Patent Document 1 switches the two sampling periods in accordance with the input mode performed in each region, thereby reducing the power consumption related to the sampling operation (energization to the touch panel and sampling AD converter). Power). However, since the sampling period in each region is fixed, there is a problem that the reduction in power consumption is not sufficient. For example, even if the displacement speed of handwritten input handwriting is slow and it can be reproduced as a sufficiently high quality image without losing handwritten image information even in a long sampling period, there is a problem that power is wasted because it is fixed. .

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an information input display device capable of reducing power consumption and extending usable time without impairing the quality of a handwritten input image. To do.

  The above object is achieved by the invention described in any one of the following items 1 to 4.

1. In an information input display device capable of displaying an image based on information handwritten on the screen,
Coordinate detection means for detecting the coordinates of the position on the screen pressed by handwriting input;
Detection period control means for controlling the coordinate detection period of the coordinate detection means,
The detection cycle control means includes
Information for controlling a coordinate detection period of the coordinate detection means based on a displacement mode of the coordinates detected by the coordinate detection means and a correction mode of the image displayed on the screen or any one thereof Input display device.

2. A displacement amount detecting means for detecting a displacement amount between the coordinates previously detected by the coordinate detecting means and the coordinates detected this time;
2. The information input display device according to claim 1, wherein the detection cycle control unit controls a coordinate detection cycle of the coordinate detection unit based on a detection result of the displacement amount detection unit.

3. Coordinate prediction means for predicting the coordinates detected this time based on the coordinates previously detected by the coordinate detection means and the coordinates detected last time;
The detection cycle control unit controls the coordinate detection cycle of the coordinate detection unit based on a deviation amount between the current coordinate predicted by the coordinate prediction unit and the current coordinate detected by the coordinate detection unit. 3. The information input display device as described in 1 or 2 above.

4). Mode selection means for selecting an image correction mode based on the handwritten input information to be displayed on the screen;
4. The information input display device according to any one of claims 1 to 3, wherein the detection cycle control unit controls a coordinate detection cycle of the coordinate detection unit based on a selection result of the mode selection unit.

  According to the present invention, the detection cycle control unit controls the coordinate detection cycle of the coordinate detection unit based on the displacement mode of the coordinates detected by the coordinate detection unit and / or the correction mode of the image displayed on the screen. It was set as the structure to do. Therefore, for example, if the displacement amount of the detected handwriting input is slow and the amount of displacement of the coordinate is small, the coordinate can be reproduced as a sufficiently high quality image without losing the handwritten image information even if the coordinate detection cycle is lengthened. By increasing the detection cycle, power consumption can be reduced. On the other hand, when the displacement rate of the detected coordinates is high, the handwriting image quality is maintained by shortening the coordinate detection cycle and sampling without losing the handwritten image information. Like that. As a result, the power consumption can be reduced and the usable time can be extended without degrading the quality of the handwritten input image.

  It is also possible to predict the currently detected coordinate from the already detected coordinate displacement mode, and adjust the coordinate detection cycle based on the deviation amount between the predicted current coordinate and the actually detected coordinate. Therefore, for example, when the amount of deviation is small, the handwriting input handwriting is highly likely to be a straight line. For this reason, even if the coordinate detection cycle is lengthened, the image can be reproduced as a sufficiently high quality image without losing the handwritten image information. Therefore, the power consumption can be reduced by increasing the coordinate detection cycle. On the other hand, when the amount of deviation is large, the handwriting input handwriting is likely to be a fine curve, a broken line (character) or the like. For this reason, the quality of the handwritten image is maintained by sampling without shortening the coordinate detection cycle and missing the handwritten image information. As a result, the power consumption can be reduced and the usable time can be extended without degrading the quality of the handwritten input image.

  Similarly, the coordinate detection cycle can be adjusted based on an image correction mode (line thickness, spline, straight line, ellipse correction, etc.) based on handwritten input information displayed on the screen. Therefore, for example, when the correction mode is selected, even if the coordinate detection cycle is lengthened, it can be reproduced as a sufficiently high quality image by the correction. Therefore, the power consumption can be reduced by increasing the coordinate detection cycle. .

  Embodiments of an information input display device according to the present invention will be described below with reference to the drawings. In addition, although this invention is demonstrated based on embodiment of illustration, this invention is not limited to this embodiment.

  First, the external appearance of the information input display device 1 according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram illustrating an appearance of an information input display device 1 according to an embodiment of the present invention.

  As shown in FIG. 1, the information input display device 1 includes an information input display device body 2, a touch pen 5, and the like.

  The information input device main body 2 stores document information stored in a memory card 28, which will be described later, and document information received from an external server, information terminal, etc. via a communication network (not shown) by the communication unit 29. This is a portable information terminal that displays an image based on the information based on the handwritten input on the screen of the display unit 21 of the information input display device main body 2 using the touch pen 5 and the like.

  Next, the configuration of the main part of the information input display device body 2 will be described with reference to FIG. FIG. 2 is a block diagram showing a schematic configuration of the information input display device main body 2.

  As shown in FIG. 2, the information input display device main body 2 includes a display unit 21, a display driver 22, a touch panel 23, a touch panel controller 24, a control unit 25, a ROM 26, a RAM 27, a memory card 28, a communication unit 29, and an operation unit 30. Etc.

  The display unit 21 is a so-called display device having a function (memory property) for holding display contents without a power source, such as a display device including a ferroelectric liquid crystal described in JP-A-10-324155. It is a display medium called electronic paper. Electronic paper can rewrite information electrically and consumes power only at the time of rewriting information, while it is possible to display information without consuming power after rewriting is completed. Power consumption can be suppressed.

  The display unit 21 uses an image based on document information stored in the memory card 28, document information received from an external server, an information terminal, or the like via a communication network (not shown) by the communication unit 29, and the touch pen 5. Then, an image or the like based on the information input by handwriting is displayed on the screen of the display unit 21. Note that the display unit 21 may also display a switch button for selecting a menu using a GUI interlocked with the touch panel 23.

  The display driver 22 is a drive circuit for the display unit 21 provided with a buffer memory for image signals constituting an image reproduced and displayed on the display unit 21.

  The touch panel 23 is provided so as to overlap the screen of the display unit 21, and outputs an analog voltage corresponding to a position on the screen pressed by handwriting input or menu selection input using the touch pen 5. As a configuration of the touch panel 23, for example, a resistive film method in which a transparent resistor is attached to the screen of the display unit 21, an electromagnetic induction method in which a detection pad is provided directly below the display unit 21 to communicate with the touch pen 5, and the like. However, in this embodiment, an example of a resistance film method is shown.

  The touch panel controller 24 applies an analog voltage corresponding to the pressed position on the screen output from the touch panel 23 by applying a voltage in the X direction and the Y direction of the touch panel 23 at a predetermined sampling period (coordinate detection period). Convert to digital signals and convert to XY coordinates. Note that the sampling period is set by the control unit 25.

  Here, the configuration of the main part of the touch panel controller 24 will be described with reference to FIG. FIG. 3 is a block diagram illustrating a schematic configuration of the touch panel controller 24.

  The touch panel controller 24 includes a touch panel detection control unit 241, a timer 242, an X direction heating circuit 243, a Y direction heating circuit 244, an X direction AD converter 245, a Y direction AD converter 246, and the like.

  The touch panel detection control unit 241 sets the value of the sampling period output from the control unit 25 in the timer 242. The touch panel detection control unit 241 performs an operation of applying a predetermined voltage in the X direction of the touch panel 23 to the X direction electrification circuit 243 and a Y direction AD converter 246 from the touch panel 23 every time the count up signal from the timer 242 is received. An analog voltage corresponding to the pressed position on the screen to be output is converted into a digital signal, and an operation for acquiring the Y coordinate is executed. Similarly, the operation of causing the Y direction electrification circuit 244 and the X direction AD converter 245 to acquire the X coordinate is executed.

  The timer 242 holds the value of the sampling period, and cyclically outputs a count-up signal to the touch panel detection control unit 241.

  The X-direction AD converter 245 and the Y-direction AD converter 246 convert the analog voltage corresponding to the pressed position on the screen output from the touch panel 23 into a digital signal and acquire the X coordinate and the Y coordinate, respectively. When the touch panel 23 is not pressed, a value outside the coordinate value range of the touch panel 23, for example, a negative number or a value larger than the maximum value is shown.

  The X-direction heating circuit 243 and the Y-direction heating circuit 244 apply predetermined voltages in the X direction and the Y direction of the touch panel 23 every time a signal from the touch panel detection control unit 241 synchronized with the count-up signal is received. Thus, the touch panel 23 and the touch panel controller 24 function as coordinate detection means in the present invention.

  Returning to FIG. 2, the control unit 25 includes a display image generation unit 251, a displacement detection / prediction unit 253, a touch panel controller control unit 254, and the like.

  The control unit 25 receives a signal from the operation unit 30 or the touch panel controller 24 and a control signal from an external server (not shown), etc., and comprehensively performs a display operation and an image signal processing operation performed in the information input display device body 2. To control. The control unit 32 also includes an image based on document information stored in the memory card 28, document information received from an external server, an information terminal, or the like via a communication network (not shown) by the communication unit 29, and the touch pen 5 Is used to generate an image or the like based on information handwritten on the screen of the display unit 21 of the information input display device main body 2 and output the generated image to the display unit 21.

  The display image generation unit 251 is input by handwriting into document information stored in the memory card 28, document information received from an external server, information terminal, or the like via a communication network (not shown) by the communication unit 29, and the touch panel 23. An image based on the coordinate data detected by the touch panel controller 24 is generated and output to the display unit 21.

  The display image generation unit 251 includes a plurality of correction modes for correcting an image based on handwritten input information displayed on the display unit 21. Examples of the correction mode include line width, spline, straight line, ellipse correction, and the like.

  The displacement detection / prediction unit 253 detects the amount of displacement between the coordinates previously detected by the touch panel controller 24 and the coordinates detected this time. Further, the displacement detection / prediction unit 253 predicts the coordinates detected this time based on the coordinates previously detected by the touch panel controller 24 and the previously detected coordinates. Thus, the displacement detection / prediction unit 253 functions as the displacement amount detection means and the coordinate prediction means in the present invention.

  The touch panel controller control unit 254 functions as a detection cycle control unit in the present invention, and is selected by the displacement amount of the detected coordinates and the predicted coordinates, that is, the displacement mode of the coordinates, and the cross key 302. The sampling period is set based on the correction mode and the like, and is output to the touch panel controller 24. The details of the sampling cycle control operation performed by the control unit 25 will be described later.

  A ROM (Read Only Memory) 26 stores each control program executed by the control unit 25.

  A RAM (Randam Access Memory) 27 temporarily stores work data such as arithmetic processing and control processing.

  The memory card 28 stores document data and the like.

  The communication unit 29 includes, for example, a wireless LAN wireless communication device, and transmits and receives images, control signals, and the like to and from an external server, information terminal, and the like via a communication network (not shown). In addition, Bluetooth, wireless USB, or a low power consumption type device may be used as the wireless communication means.

  The operation unit 30 is a switch group including the power switch 301 shown in FIG. 1 and a cross key 302 for performing various operations and settings. The cross key 302 functions as a mode selection unit in the present invention, and selects a correction mode to be performed by the display image generation unit 251. The cross key 302 is displayed on the display unit 21 among the document information stored in the memory card 28 and the document information received from the external server, information terminal, etc. via the communication network (not shown) by the communication unit 29. Select the information to be used.

  Next, the flow of the sampling cycle control operation will be described with reference to the flowcharts shown in FIGS.

(Control flow 1)
FIG. 4 is a flowchart according to an example of the sampling cycle control operation. The control flow 1 is to set the sampling period according to the displacement amount of the handwritten input coordinate, that is, the displacement speed of the handwritten input handwriting.

  First, the control unit 25 sets system initialization, connection to a communication network, display of an initial screen, initial settings of various modes, initial values of sampling cycles, and the like (step S11).

  Next, the display image generation unit 251 reads the document information selected by the cross key 302 from the memory card 28, the external server, the information terminal, etc. (step S12), generates a document image based on the read document information, The data is output and displayed on the display unit 21 (step 13).

  Next, the touch panel controller 24 starts a coordinate detection operation (step S14). At this time, when the touch panel 23 is not pressed, the detected coordinate value is outside the range of the coordinate value of the touch panel 23, for example, a negative number or a value larger than the maximum value. When the touch panel 23 is pressed and an appropriate coordinate value is detected (step S15; Yes), the display image generation unit 251 generates a handwritten input image based on the detected coordinate value and outputs it to the display unit 21. The document image is displayed so as to overlap (step S16). At this time, when the coordinate detection is performed for the first time, drawing is performed only on the detected coordinates. In the second and subsequent times, the coordinates detected this time, the coordinates detected up to the previous time, and the region between these coordinates are interpolated and drawn. As the interpolation method, for example, linear interpolation or the like can be used.

  Next, the displacement / detection predicting unit 253 detects the amount of displacement between the coordinates previously detected by the touch panel controller 24 and the coordinates detected this time (step S17). Here, the amount of displacement is a linear distance between two coordinates, a neighborhood distance, or the like.

  Next, the touch panel controller control unit 254 compares the displacement amount detected by the displacement / detection prediction unit 253 with a preset threshold value related to the displacement amount. As a result of comparison, the displacement amount is smaller than the threshold value. (Step S18; No), that is, when the displacement speed of the handwriting input handwriting is slow, even if the sampling period is lengthened, the handwritten image information can be reproduced without loss, so the sampling period is set long. (Step S20). On the other hand, when the amount of displacement is larger than the threshold (step S18; Yes), that is, when the displacement speed of the handwriting input handwriting is high, the sampling period is set short (step S19), and the handwritten image information is not lost. The quality of the handwritten image is maintained by sampling. As for the setting of the sampling period, the inversely proportional method may be used so that the sampling period is continuously shortened as the displacement amount increases.

  Thus, by setting the sampling period according to the displacement amount of the handwritten input coordinates, that is, the displacement speed of the handwriting input handwriting, the power consumption can be reduced without degrading the quality of the handwritten input image. Is possible.

(Control flow 2)
FIG. 5 is a flowchart according to another example of the sampling cycle control operation. The control flow 2 predicts the currently detected coordinate from the displacement mode of the already detected coordinate, and sets the sampling cycle according to the deviation amount between the predicted current coordinate and the actually detected coordinate. It is. In the flowchart shown in FIG. 5, the operations in steps S31 to S36 are the same as the operations in steps S11 to S16 shown in FIG.

  In step S <b> 37, the displacement / detection prediction unit 253 predicts the coordinates detected this time based on the displacement mode between the coordinates previously detected by the touch panel controller 24 and the coordinates detected last time. That is, assuming that the displacement mode from the previously detected coordinate to the previously detected coordinate is the same as the displacement mode from the previously detected coordinate to the currently detected coordinate, the currently detected coordinate is predicted. .

  Next, the touch panel controller control unit 254 calculates a deviation amount between the coordinates detected this time predicted by the displacement / detection prediction unit 253 and the coordinates actually detected this time by the touch panel controller 24. Then, the calculated deviation amount is compared with a preset threshold value relating to the deviation amount. As a result of comparison, if the deviation amount is smaller than the threshold value (step S38; No), the handwriting input handwriting is straight. There is a high possibility that it is a straight line. For this reason, even if the sampling period is lengthened, it is possible to reproduce the image with sufficient quality without missing the handwritten image information by performing linear interpolation or the like, so the sampling period is set long (step S40). On the other hand, when the amount of deviation is larger than the threshold (step S38; Yes), the handwriting input handwriting is likely to be a fine curve, a broken line (character), or the like. For this reason, the quality of the handwritten image is maintained by setting the sampling cycle short (step S39) and sampling without losing the handwritten image information.

  In this way, by predicting the currently detected coordinate from the displacement mode of the already detected coordinate, and setting the sampling period according to the amount of deviation between the predicted current coordinate and the actually detected coordinate this time The power consumption can be reduced without degrading the quality of the handwritten input image.

(Control flow 3)
FIG. 6 is a flowchart according to another example of the sampling cycle control operation. The control flow 3 sets a sampling cycle according to the selected correction mode (in this case, line width correction). In the flowchart shown in FIG. 6, the operations in steps S51 through S56 are the same as the operations in steps S11 through S16 shown in FIG.

  In step S57, when the mode for displaying the line width of the handwritten input image with the cross key 302 is selected with the cross key 302 (step S57; Yes), the touch panel controller control unit 254 sets the sampling cycle longer (step S60). On the other hand, when the thin display mode is selected (step S57; No), the sampling cycle is set short (step S59). This is a handwritten input handwriting is a fine curve, a broken line (character), etc., even if the sampling period is shortened and sampled without losing the handwritten image information, if the line width of the handwritten input image is displayed thick, It is difficult to faithfully reproduce such information. For this reason, the sampling cycle is lengthened to suppress wasteful power consumption.

(Control flow 4)
FIG. 7 is a flowchart according to another example of the sampling cycle control operation. The control flow 3 sets a sampling period in accordance with the selected correction mode (in this case, spline correction). In the flowchart shown in FIG. 7, the operations in steps S71 to S75 are the same as the operations in steps S11 to S15 shown in FIG.

  In step S76, the display image generation unit 251 performs spline correction based on the handwritten input image generated based on the already acquired coordinates and the coordinates acquired this time, generates a corrected image of the handwritten input image, and is not illustrated. Save in the image memory (step S76). Subsequently, the display image generation unit 251 erases the handwritten input image displayed superimposed on the document image, reads the correction image stored in the image memory, outputs the corrected image to the display unit 21 and overlays it on the document image. It is displayed (step S77). The handwritten input image is erased by redisplaying a pixel image or a small block document image with the handwritten image on the display unit 21.

  Next, when the mode for performing spline correction on the handwritten input image is selected by the cross key 302 (step S78; Yes), the touch panel controller control unit 254 sets the sampling cycle longer (step S80). On the other hand, when not correcting (step S78; No), a short sampling period is set (step S79). This is because even if handwritten image information is somewhat lost by increasing the sampling period, it can be reproduced as a sufficiently high quality image by spline correction, so that the sampling period is increased and wasteful power consumption is suppressed. .

  The present invention has been described above with reference to the embodiments. However, the present invention should not be construed as being limited to the above-described embodiments, and can be changed or improved as appropriate. For example, in the above-described embodiment, the control flows 1 to 4 are executed independently, but these flows may be executed in appropriate combination. Thereby, a sampling period is set more appropriately and power consumption can be further suppressed.

It is a figure which shows the external appearance of the information input display apparatus which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of an information input display apparatus main body. It is a block diagram which shows schematic structure of a touchscreen controller. It is a flowchart which shows the flow by an example of coordinate detection sampling period control. It is a flowchart which shows the flow by another example of coordinate detection sampling period control. It is a flowchart which shows the flow by another example of coordinate detection sampling period control. It is a flowchart which shows the flow by another example of coordinate detection sampling period control.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Information input display apparatus 2 Information input display apparatus main body 21 Display part 22 Display driver 23 Touch panel 24 Touch panel controller 241 Touch panel detection control part 242 Timer 243 X direction electric circuit 244 Y direction electric circuit 245 X direction AD converter 246 Y direction AD Converter 25 Control unit 251 Display image generation unit 253 Displacement detection / prediction unit 254 Touch panel controller control unit 26 ROM
27 RAM
28 Memory Card 29 Communication Unit 30 Operation Unit 301 Power Switch 302 Four-way Key 5 Touch Pen

Claims (4)

In an information input display device capable of displaying an image based on information handwritten on the screen,
Coordinate detection means for detecting the coordinates of the position on the screen pressed by handwriting input;
Detection period control means for controlling the coordinate detection period of the coordinate detection means;
Coordinate prediction means for predicting the coordinates detected this time based on the coordinates previously detected by the coordinate detection means and the coordinates detected last time ;
The detection cycle control unit controls the coordinate detection cycle of the coordinate detection unit based on a deviation amount between the current coordinate predicted by the coordinate prediction unit and the current coordinate detected by the coordinate detection unit. Yes, and
When the deviation amount is larger than a predetermined value, the detection cycle control unit sets the coordinate detection cycle of the coordinate detection unit to a first value,
When the amount of deviation is smaller than the predetermined value, the display is controlled so as to perform linear interpolation between the coordinates detected by the coordinate detection means, and the detection cycle control means is controlled by the coordinate detection means. The coordinate detection cycle is set to a second value that is larger than the first value . In an information input display device capable of displaying an image based on information handwritten on the screen,
Coordinate detection means for detecting the coordinates of the position on the screen pressed by handwriting input;
Detection period control means for controlling the coordinate detection period of the coordinate detection means;
Mode selection means for selecting a correction mode for correcting the image when displaying an image on the screen based on the coordinates detected by the coordinate detection means;
The detection cycle control unit controls a coordinate detection cycle of the coordinate detection unit based on the correction mode selected by the mode selection unit, and
The correction mode is a mode for correcting the line width of the image,
When the mode for displaying the line width of the image with the first thickness is selected, the detection cycle control unit sets the coordinate detection cycle of the coordinate detection unit to a first value,
When the mode for displaying the line width of the image with the second thickness larger than the first thickness is selected, the detection cycle control unit sets the coordinate detection cycle of the coordinate detection unit to the first thickness. An information input display device characterized in that it is set to a second value larger than the value of. In an information input display device capable of displaying an image based on information handwritten on the screen,
Coordinate detection means for detecting the coordinates of the position on the screen pressed by handwriting input;
Detection period control means for controlling the coordinate detection period of the coordinate detection means;
Mode selection means for selecting a correction mode for correcting the image when displaying an image on the screen based on the coordinates detected by the coordinate detection means;
The detection cycle control unit controls a coordinate detection cycle of the coordinate detection unit based on the correction mode selected by the mode selection unit, and
The correction mode is a mode for performing spline correction on the image,
When the mode in which the image is not spline corrected is selected, the detection cycle control unit sets the coordinate detection cycle of the coordinate detection unit to a first value,
When the mode for correcting the spline of the image is selected, the detection cycle control unit sets the coordinate detection cycle of the coordinate detection unit to a second value larger than the first value. Information input display device. A displacement amount detecting means for detecting a displacement amount between the coordinates previously detected by the coordinate detecting means and the coordinates detected this time;
4. The information input display according to claim 1, wherein the detection cycle control unit controls a coordinate detection cycle of the coordinate detection unit based on a detection result of the displacement amount detection unit. 5. apparatus.

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