JP7151525B2 - Display device, display method and program - Google Patents

Description

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

2. Description of the Related Art In recent years, there has been known a display device capable of drawing a line, a figure, or the like on a display unit by a user's input such as tracing the surface of the display screen with a finger.

In a display device having such a drawing function, a technique has been proposed to reduce power consumption by reducing the display area according to the remaining power of the battery.

However, in this technique, after the user performs drawing in a state in which the display area is reduced, when the charge level of the battery recovers and the display area returns to the state before the reduction, drawing information for the display image is not drawn. There is a problem that a shift occurs in the position.

The present invention has been made in view of the above, and aims to provide a display device, a display method, and a program capable of changing the drawing position of drawing information according to the size of the display area on the display screen. aim.

In order to solve the above-described problems and achieve the object, the present invention provides a display device driven by a battery, in which a display area corresponding to the remaining amount of the battery is provided in the display screen of the display device. a display area setting unit for setting; an indicated position detection unit for detecting an indicated position with respect to the display area; an indicated position storage unit for storing the setting state of the display area and coordinates of the indicated position in association with each other; a drawing control unit for drawing drawing information at a position; and based on the changed setting state when the display area setting unit changes the setting of the display area and information stored in the indicated position storage unit. and a display control unit for enlarging or reducing and displaying the drawing information drawn before the setting of the display area is changed.

According to the present invention, in a display device that is driven by a battery and performs drawing via a touch panel, when the display area is reduced when the remaining battery level is reduced due to discharging, or when the remaining battery level increases due to charging, In this case, even when the display area is enlarged, it is possible to prevent the occurrence of displacement of the drawing position with respect to the display image.

FIG. 1 is an external perspective view of an electronic blackboard, which is an application example of a display device. FIG. 2 is a hardware block diagram showing an example of the hardware configuration of the electronic blackboard. FIG. 3 is a functional block diagram showing an example of the functional configuration of the controller section of the electronic blackboard. FIG. 4 is a diagram for explaining an outline of the operation of the electronic blackboard. FIG. 5 is a diagram illustrating a method of setting a narrow display area on the display screen of the display when the remaining battery power is low. FIG. 6 is a diagram for explaining a method of enlarging or reducing drawing information. FIG. 7 is a flowchart showing an example of the flow of processing performed by the electronic blackboard.

(Explanation of outline of electronic blackboard)
An overview of the electronic blackboard 10 according to the embodiment will be described below with reference to the accompanying drawings. FIG. 1 is an external perspective view of an electronic blackboard 10 that is an application example of a display device. As shown in FIG. 1 , the electronic blackboard 10 has a display 280 , a controller section 11 , a battery section 41 and a touch sensor 214 .

The display 280 is a display device that outputs drawing information and image information, and is configured by a liquid crystal panel, an organic EL panel, or the like. The display 280 has a display screen 42 for displaying image information and drawing information. Note that the display 280 is an example of a display device.

The controller section 11 and the battery section 41 are mounted inside the housing of the display 280 . The controller unit 11 controls the overall operation of the electronic blackboard 10 . The battery unit 41 supplies power to the electronic blackboard 10 . Note that the battery 224 is, for example, a primary battery such as a manganese battery or an alkaline battery, or a secondary battery such as a lithium ion battery or a nickel-metal hydride battery.

The touch sensor 214 performs coordinate input and coordinate detection using, for example, an infrared shielding method. Specifically, the touch sensors 214 are installed at both ends of the upper side of the display 280 . The touch sensor 214 includes both a light-emitting portion that emits infrared rays and a light-receiving portion that receives infrared rays. Touch sensor 214 emits multiple infrared rays parallel to the screen of display 280 . The emitted infrared rays are reflected by a reflecting member provided around the display 280, return along the same optical path as the emitted infrared rays, and are received by the light receiving section. At that time, if an object such as a hand or an electronic pen is present on the screen, infrared rays reflected by these objects are detected by the light receiving unit. At this time, the two touch sensors 214 simultaneously receive the infrared rays reflected from the object, and identify the coordinate position where the object touches based on the principle of triangulation.

(Description of the hardware configuration of the electronic blackboard)
Next, the hardware configuration of the electronic blackboard 10 will be described with reference to FIG. FIG. 2 is a hardware block diagram showing an example of the hardware configuration of the electronic blackboard 10. As shown in FIG.

As shown in FIG. 2 , the electronic blackboard 10 includes a controller section 11 , a display section 21 , a touch panel section 31 and a battery section 41 .

The controller unit 11 controls the overall operation of the electronic blackboard 10 . The controller unit 11 includes a CPU (Central Processing Unit) 201 , a ROM (Read Only Memory) 202 , a RAM (Random Access Memory) 203 , and an SSD (Solid State Drive) 204 .

The CPU 201 controls the operation of the electronic blackboard 10 as a whole. The ROM 202 stores programs used to drive the CPU 201, such as the CPU 201 and an IPL (Initial Program Loader). A RAM 203 is used as a work area for the CPU 201 . The SSD 204 stores various data such as electronic blackboard programs.

The program executed by the CPU 201 is preinstalled in the ROM 202 and provided, and can be installed in the controller unit 11 or executable. , a computer-readable recording medium such as a DVD. Furthermore, the program may be stored on a computer connected to a network such as the Internet, and provided by being downloaded via the network. Also, the program may be configured to be provided or distributed via a network such as the Internet.

The display unit 21 displays drawing information drawn with the hand H or the electronic pen 290 and image information input from an external device. The display unit 21 includes a GPU (Graphics Processing Unit) 212 , a display controller 213 and a display 280 .

The GPU 212 is a semiconductor chip that specializes in graphics such as drawing information and image information. The display controller 213 controls and manages screen display in order to output an output image from the GPU 212 to the display 280 or the like. In addition, the display controller 213 controls the state of the backlight of the display 280 (lighting, extinguishing, dimming, increasing brightness, etc.).

The touch panel unit 31 includes a touch sensor 214 and a touch panel controller 215 . The touch sensor 214 is a sensor that detects the touch of the electronic pen 290, the user's hand H, etc. on the display 280 and the touched position. The outline of the touch sensor 214 is as described above. The touch panel controller 215 controls operations of the touch sensor 214 .

Note that the touch sensor 214 is not limited to the infrared shielding type, but is a capacitive type touch panel that identifies a contact position by detecting a change in capacitance, or identifies a contact position by a voltage change of two opposing resistive films. Detecting means such as a resistive touch panel that detects an electromagnetic induction generated when a contact object touches the display unit to identify the contact position may be used.

Further, the electronic pen 290 described above is controlled by the electronic pen controller 216 provided in the electronic blackboard 10 . The electronic pen controller 216 communicates with the electronic pen 290 to determine whether or not the display 280 has been touched with the tip of the pen or the bottom of the pen. Note that the electronic pen controller 216 may determine not only the pen tip and pen butt of the electronic pen 290 but also the portion of the electronic pen 290 gripped by the user or other portions of the electronic pen 290 that are touched or not.

The battery section 41 includes a battery 224 and a battery controller 225 . A battery 224 supplies power to the electronic blackboard 10 . A battery controller 225 manages the remaining amount of the battery 224 . The electronic blackboard 10 may further include a power supply unit that receives AC power and supplies it to the electronic blackboard 10 as the battery unit 41 . The battery 224 is provided so that the electronic whiteboard 10 can be used even in places where AC power cannot be supplied.

The electronic blackboard 10 further includes a network I/F (Interface) 205 and an external device connection I/F 206 . A network I/F 205 controls communication with a communication network not shown in FIG. The external device connection I/F 206 is an interface for connecting various external devices. The external devices in this case are, for example, a USB (Universal Serial Bus) memory 230 and external devices (microphone 240, speaker 250, camera 260).

The electronic blackboard 10 also includes a capture device 211 , a short-range communication circuit 219 , an antenna 219 a of the short-range communication circuit 219 , a power switch 222 , and selection switches 223 .

The capture device 211 causes the display of an external PC (Personal Computer) 270 to display video information as a still image or moving image.

The short-range communication circuit 219 is a communication circuit such as NFC (Near Field Communication) or Bluetooth (registered trademark).

The power switch 222 is a switch for switching ON/OFF of the power of the electronic whiteboard 10 . The selection switches 223 are, for example, a group of switches for adjusting the brightness and color of the display on the display 280 .

Further, the electronic blackboard 10 has a bus line 210 . A bus line 210 is an address bus, a data bus, or the like for electrically connecting each component such as the CPU 201 shown in FIG.

(Description of the hardware configuration of the electronic blackboard)
Next, the functional configuration of the controller section 11 of the electronic blackboard 10 will be described with reference to FIG. FIG. 3 is a functional block diagram showing an example of the functional configuration of the controller section 11 of the electronic blackboard 10. As shown in FIG.

The controller unit 11 shown in FIG. 2 implements each functional unit shown in FIG. 3 inside the CPU 201 by executing a program used to drive the CPU 201 . That is, the controller unit 11 includes a battery level detection unit 111, a display area setting unit 112, a backlight control unit 113, an indicated position detection unit 114, an indicated position storage unit 115, a drawing control unit 116, and a display. The control unit 117 and the operation control unit 118 are implemented as functional units.

The remaining battery level detection unit 111 detects the remaining amount of the battery 224 .

The display area setting unit 112 sets a display area according to the remaining amount of the battery 224 in the display screen 42 of the display 280 (display device). In this embodiment, the display area setting unit 112 sets a display area having an area corresponding to the remaining amount of the battery 224, but the setting method of the display area is not limited to this.

Backlight control unit 113 controls the state of the backlight of display 280 . In particular, the backlight control unit 113 turns off the backlight of the area other than the display area in the display screen 42 according to the setting of the display area setting unit 112 .

The pointed position detection unit 114 detects the pointed position with respect to the display area.

The indicated position storage unit 115 associates and stores the setting state of the display area and the coordinates of the indicated position.

The drawing control unit 116 draws the drawing information at the indicated position.

When the display area setting unit 112 changes the setting of the display area, the display control unit 117 sets the display area based on the changed setting state of the display area and the information stored in the designated position storage unit 115. The drawing information drawn before is changed is enlarged or reduced and displayed.

The operation control unit 118 receives various operations for the electronic blackboard 10 . The operation control unit 118 also transmits information corresponding to the received operation to the controller unit 11 .

(Description of the hardware configuration of the electronic blackboard)
Next, FIG. 4 is a diagram for explaining an overview of the operation of the electronic blackboard 10 in this embodiment. FIG. 4 is a diagram for explaining an outline of the operation of the electronic blackboard 10. As shown in FIG.

4A shows a state (state 1) in which the entire display screen 42 of the display 280 is set to the display area 43a by the action of the display area setting section 112. FIG. When the user of the electronic blackboard 10 draws on the display area 43a with the hand H or the electronic pen 290 when the display 280 is in the state shown in FIG. Then, the drawing control unit 116 draws the drawing information 50a. Then, the designated position storage unit 115 stores the setting of the display area 43a in association with the drawing position of the drawing information 50a.

FIG. 4(b) shows a state (state 2) in which the remaining amount of the battery 224 is less than the preset threshold due to discharging of the battery 224. FIG. That is, when the remaining battery level detection unit 111 detects that the remaining amount of the battery 224 is less than the threshold, the display area setting unit 112 changes the display area 43a to reduce the power consumption of the display 280. A reduced display area 43b is set. Further, the backlight control unit 113 turns off the backlight of the area 43c of the display screen 42 other than the display area 43b. That is, the area 43c is entirely black.

4B, the display control unit 117 reduces the drawing information 50a drawn in the state before the display screen 42 is reduced to a state corresponding to the display area 43b, and draws the drawing information 50a. It is displayed as information 50b.

Further, the information drawn in the state of FIG. 4B is drawn as drawing information 50c at the drawn position. At this time, if the hand H or the electronic pen 290 touches the area 43c, the pointing position detection unit 114 ignores the touch. Alternatively, the pointed position detection section 114 may set the region 43c out of the detection range.

The drawing information 50b displayed in the state of FIG. 4B and the drawing information 50c drawn in the state of FIG. It is stored in association with being present.

Next, FIG. 4C shows a state (state 3) in which the battery 224 is charged and the remaining amount of the battery 224 exceeds a preset threshold. Although state 3 is the same as state 1, it will be described as state 3 for convenience of explanation.

When the remaining battery level detection unit 111 detects that the remaining amount of the battery 224 exceeds the threshold, the display area setting unit 112 sets the display area 43 a on the display 280 . Further, the backlight control unit 113 turns on all the backlights.

In the state of FIG. 4C, the display control unit 117 expands the drawing information 50b and 50c drawn in the state before the display screen 42 is enlarged to a state corresponding to the display area 43a. indicate. That is, drawing information 50a and 50d are displayed.

The drawing information 50a and 50d displayed in the state of FIG. 4(c) are stored in association with the setting of the display area 43a by the action of the pointing position storage unit 115. FIG.

Thereafter, state 1 (state 3) and state 2 are alternately transitioned according to the remaining amount of the battery 224 .

Although FIG. 4 illustrates that the display areas 43a and 43b are changed in two stages according to the remaining amount of the battery 224, the number of display areas to be set is not limited to two. That is, the display area may be finely changed in multiple stages according to the remaining amount of the battery 224 .

(Description of how to set the display area)
Next, a method for setting the display area 43b will be described with reference to FIG. FIG. 5 is a diagram illustrating a method of setting a narrow display area 43b on the display screen 42 of the display 280 when the battery 224 is low.

In the widest state (display area 43a in FIG. 4(a)), the display screen 42 of the display 280 has an upper left point A (0, 0) to the lower right point B(M, N), image information and drawing information can be displayed. Then, the display area setting unit 112 sets a reduced display area 43 b near the center of the display screen 42 .

The display area 43b can display image information and drawing information in a range from the upper left point C (a, b) to the lower right point D (c, d). Although the display area 43b is set near the center of the display screen 42 in the example of FIG. 5, the setting position of the display area 43b is not limited to this. That is, for example, the display area 43b may be set such that the point A (0, 0) and the point C (a, b) are aligned.

Note that the pointed position storage unit 115 stores the coordinates of the point C (a, b) and the point D (c, d) as the setting state of the display area 43b. That is, the coordinates of point C (a, b) and point D (c, d) represent the position of the display area 43b. Also, from the coordinates of point C (a, b) and point D (c, d), the size of the display area 43b, that is, the horizontal size (ca) and the vertical size (db) are calculated. be.

(Description of how to enlarge and reduce drawing information)
Next, a method of enlarging or reducing drawing information will be described with reference to FIG. FIG. 6 is a diagram for explaining a method of enlarging or reducing drawing information.

As described above, the pointing position storage unit 115 stores the setting of the display area 43b on the display screen 42 of the display 280 in association with the drawing position of the drawing information drawn there. For example, as shown in FIG. 6, when the display area 43b is set, the coordinates of the point U, which is the drawing position of the drawing information, are stored. Since the drawing information is generally a figure in which a plurality of points are continuous, the coordinates of a plurality of points U are stored. Here, to simplify the explanation, it is assumed that the drawing position is only the point U(p, q).

At this time, assume that the display area setting unit 112 expands the display area and sets the display area 43a. At this time, the display control unit 117 moves the point U(p, q) to the point V(r, s) calculated by the formulas (1) and (2).

r={(pa)/(ca)}*M (1)
s={(q−b)/(d−b)}*N (2)

That is, the display control unit 117 determines the position of the point V(r, s) in the display area 43a so as to be equal to the relative position of the point U(p, q) with respect to the display area 43b.

Conversely, when the display area setting unit 112 reduces the display area and changes the display area 43a to the display area 43b, the point V(r, s) is calculated by the equations (3) and (4). is moved to the point U(p,q) where

p=(r/M)*(ca)+a (3)
q=(s/N)*(db)+b (4)

Note that the display control unit 117 also enlarges or reduces the image information displayed in the display area 43a or the display area 43b according to the change in the setting state of the display area.

(Description of the flow of processing performed by the electronic blackboard)
Next, the flow of processing performed by the electronic blackboard 10 will be described with reference to FIG. FIG. 7 is a flow chart showing an example of the flow of processing performed by the electronic blackboard 10. As shown in FIG.

The operation control unit 118 activates the electronic blackboard 10 by detecting the user's activation operation (step S11).

The battery remaining amount detection unit 111 determines whether the remaining amount of the battery 224 is equal to or greater than a threshold (step S12). If it is determined that the remaining amount of the battery 224 is equal to or higher than the threshold (step S12: Yes), the process proceeds to step S13. On the other hand, if it is not determined that the remaining amount of the battery 224 is equal to or greater than the threshold (step S12: No), the process proceeds to step S15.

If determined as Yes in step S12, the display area setting unit 112 sets the display area to "state 1" (step S13). That is, the display area 43a is set. If the display area 43a has already been set, the display area setting unit 112 does nothing. Then, the backlight control unit 113 turns on all the backlights of the display screen 42 (step S14). After that, the process proceeds to step S17.

If determined as No in step S12, the display area setting unit 112 sets the display area to "state 2" (step S15). That is, the display area 43b is set. If the display area 43b has already been set, the display area setting unit 112 does nothing. Then, the backlight control unit 113 turns off the backlight other than the position corresponding to the display area 43b of the display screen 42 (step S16). After that, the process proceeds to step S19.

Following step S14, the display area setting unit 112 determines whether the setting of the display area has changed from "state 2" to "state 1" (step S17). If it is determined that the setting of the display area has changed from "state 2" to "state 1" (step S17: Yes), the process proceeds to step S18. On the other hand, if it is not determined that the setting of the display area has changed from "state 2" to "state 1" (step S17: No), the process proceeds to step S21.

If determined as Yes in step S17, the display control unit 117 enlarges the image information displayed in the display area 43b and the drawing information drawn in the display area 43b so as to fit the display area 43a. (Step S18). After that, the process proceeds to step S21.

Further, following step S16, the display area setting unit 112 determines whether the setting of the display area has changed from "state 1" to "state 2" (step S19). If it is determined that the setting of the display area has changed from "state 1" to "state 2" (step S19: Yes), the process proceeds to step S20. On the other hand, if it is not determined that the setting of the display area has changed from "state 1" to "state 2" (step S19: No), the process proceeds to step S21.

If determined as Yes in step S19, the display control unit 117 reduces the image information displayed in the display area 43a and the drawing information drawn in the display area 43a so as to fit the display area 43b. (Step S20). After that, the process proceeds to step S21.

The pointed position detection unit 114 determines whether the pointed position is detected in the display area 43a or the display area 43b set at that time (step S21). If it is determined that the indicated position has been detected (step S21: Yes), the process proceeds to step S22. On the other hand, if it is not determined that the designated position has been detected (step S21: No), the process proceeds to step S24.

If determined as Yes in step S21, the drawing control unit 116 draws the drawing information at the indicated position (step S22).

Subsequently, the indicated position storage unit 115 associates and stores the setting state of the display area and the indicated position (step S23).

If it is determined No in step S21, or after step S23 is executed, the operation control unit 118 detects the user's end operation, thereby determining whether or not an instruction to end the operation of the electronic blackboard 10 is given ( step S24). If it is determined that the end of the operation of the electronic blackboard 10 has been instructed (step S24: Yes), the process of FIG. 7 ends. On the other hand, if it is not determined that the end of the operation of the electronic blackboard 10 has been instructed (step S24: No), the process returns to step S12 and the above-described processing is repeated.

As described above, according to the display 280 (display device) of the present embodiment, the display area setting unit 112 causes the display screen 42 of the display 280 to indicate the remaining amount of the battery 224 that drives the display 280. An area display area 43a or display area 43b is set. Then, the indicated position detection unit 114 detects the indicated position in the display area, and the indicated position storage unit 115 associates and stores the setting state of the display areas (43a, 43b) and the coordinates of the indicated position. The drawing control unit 116 then draws the drawing information at the indicated position. Further, when the display area setting unit 112 changes the setting of the display areas (43a, 43b), the display control unit 117 changes the setting state of the changed display area and the information stored in the pointing position storage unit 115. Based on this, the drawing information drawn before the setting of the display area is changed is enlarged or reduced and displayed. Therefore, even if the size of the display area of the display 280 changes, it is possible to prevent the positional deviation of the drawing information from occurring with respect to the display area.

Further, according to the display 280 of the present embodiment, the display area setting unit 112 sets the narrow display area 43b when the remaining amount of the battery 224 is less than the threshold, and the remaining amount of the battery 224 exceeds the threshold. In this case, a wide display area 43a is set. Therefore, it is possible to set the display area according to the remaining amount of the battery 224 .

Further, according to the display 280 of the present embodiment, when the display area setting unit 112 reduces the display area 43a in the display screen 42 to the display area 43b, the backlight control unit 113 controls the display area other than the display area 43b. Turns off the region's backlight. Therefore, decrease in the remaining amount of the battery 224 can be suppressed.

Further, according to the display 280 of the present embodiment, the setting state of the display area is determined by the position of the display area (for example, the upper left coordinates and the lower right coordinates of the display area) and the size (for example, the number of vertical and horizontal pixels of the display area). be. Therefore, the setting state of the display area can be easily stored.

Further, according to the display 280 of the present embodiment, the display control unit 117 controls the relative position of the drawing information with respect to the display area before the setting change, the relative size of the drawing information with respect to the display area, and the relative size of the drawing information with respect to the display area after the setting change. The drawing information before the setting change is enlarged or reduced so that the relative position of the drawing information and the relative size of the drawing information with respect to the display area become equal. Therefore, according to the size of the display area on the display screen 42, the drawing position of the drawing information can be changed so that the relative position with respect to the display area is constant.

Although the embodiments of the present invention have been described above, the above-described embodiments are presented as examples and are not intended to limit the scope of the present invention. This novel embodiment can be implemented in various other forms. Also, various omissions, replacements, and changes can be made without departing from the scope of the invention. Moreover, this embodiment is included in the scope and gist of the invention, and is included in the scope of the invention described in the claims and its equivalents.

REFERENCE SIGNS LIST 10 electronic blackboard 42 display screen 43a, 43b display area 50a, 50b, 50c, 50d drawing information 111 remaining battery level detection unit 112 display area setting unit 113 backlight control unit 114 pointing position detection unit 115 pointing position storage unit 116 drawing control unit 117 display control unit 224 battery 280 display (display device)
290 electronic pen H hand

Japanese Unexamined Patent Application Publication No. 2012-157100

Claims (7)

A display device powered by a battery,
a display area setting unit for setting a display area according to the remaining amount of the battery in the display screen of the display device;
a pointing position detection unit that detects a pointing position with respect to the display area;
an indicated position storage unit that associates and stores the setting state of the display area and the coordinates of the indicated position;
a drawing control unit for drawing drawing information at the designated position;
When the display area setting unit changes the setting of the display area, before the setting of the display area is changed based on the changed setting state and the information stored in the indicated position storage unit a display control unit that enlarges or reduces and displays the drawn drawing information;
A display device. The display area setting unit
setting the display area narrower when the remaining amount of the battery is less than a threshold,
setting the display area wide when the remaining amount of the battery exceeds the threshold;
A display device according to claim 1 . Further comprising a backlight control unit that turns off the backlight in an area other than the display area on the display screen according to the setting of the display area setting unit,
The display device according to claim 1 or 2. The setting state is the position and size of the display area,
The display device according to any one of claims 1 to 3. The display control unit controls the relative position of the drawing information with respect to the display area before setting change and the relative size of the drawing information with respect to the display area,
enlarging or reducing the drawing information so that the relative position of the drawing information with respect to the display area after the setting change and the relative size of the drawing information with respect to the display area become equal;
The display device according to any one of claims 1 to 4. In a display device driven by a battery,
a display area setting step of setting a display area corresponding to the remaining amount of the battery in the display screen of the display device;
an indicated position detection step of detecting an indicated position with respect to the display area;
an indicated position storing step of associating and storing the setting state of the display area and the coordinates of the indicated position;
a drawing control step of drawing drawing information at the indicated position;
When the setting of the display area is changed in the display area setting step, before the setting of the display area is changed based on the changed setting state and the information stored in the pointing position storage step a display control step of enlarging or reducing and displaying the drawn drawing information;
display method. to a computer controlling a display device powered by a battery,
a display area setting step of setting a display area corresponding to the remaining amount of the battery in the display screen of the display device;
an indicated position detection step of detecting an indicated position with respect to the display area;
an indicated position storing step of associating and storing the setting state of the display area and the coordinates of the indicated position;
a drawing control step of drawing drawing information at the indicated position;
When the setting of the display area is changed in the display area setting step, before the setting of the display area is changed based on the changed setting state and the information stored in the pointing position storage step a display control step of enlarging or reducing and displaying the drawn drawing information;
program to run.

Images