JP2015210504A - Display device and display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device and a display method that are suitable to an observer who views a displayed image and an operator who operates a touch panel.SOLUTION: An electronic blackboard 1 makes brightness of a display surface 14 relatively high in a presentation mode so that a displayed image is easy for an observer who is distant from the electronic blackboard 1 to see, and makes the brightness of the display surface 14 relatively low in a handwriting mode so that a presenter as an operator who operates a touch panel 23 is not dazzled. Consequently, there is provided the electronic blackboard 1 which is suitable to both the observer who views the displayed image and the operator who operates the touch panel.

Description

  The present invention relates to a display device and a display method that have a relatively large display screen and can input handwritten characters using a touch panel.

  A display device with a relatively large display screen, represented by an electronic whiteboard or electronic blackboard, can display information to a large number of participants in a meeting place or school lesson. The number of introductions at companies and schools is increasing due to its high functionality compared to blackboards and blackboards.

  Such a display device displays a still image or a moving image stored in the storage unit on a display screen, displays a document created with presentation software, or inputs characters or figures by hand using a touch panel. It has a function. Character input by handwriting is easier and more intuitive than typing a keyboard, and can be input in the same way as a whiteboard or blackboard using a touch pen.

  For example, when a display device is used for the purpose of presentation, many people view the display device, and the visibility decreases if the distance to the display device is long, so the luminance of the display screen is increased by increasing the amount of light emitted from the backlight. It is high.

  The portable information device described in Patent Document 1 divides a backlight area into a plurality of divided areas, and controls the lighting state of each divided area according to the display area of information displayed by the application.

JP 2011-77600 A

  By increasing the brightness of the display screen, it can be seen well from farther away, and the visibility can be improved. However, a presenter who makes a presentation may stand near the display device and perform handwriting input using a touch panel. In this case, if the brightness of the display screen is high, an operator who is a presenter who intends to input by handwriting The display screen is dazzling, making input work difficult.

  The portable information device described in Patent Document 1 is not intended for a large-screen display device for presentations such as an electronic blackboard, and for the purpose of suppressing power consumption by controlling the lighting state of the backlight. Therefore, the above problems cannot be solved.

  An object of the present invention is to provide a display device and a display method suitable for both an observer who views a displayed image and an operator who operates the image.

The present invention is a display device capable of operating in at least two operation modes,
A display unit having a display surface for displaying an image, wherein the display unit is configured to change the luminance of the display surface;
A touch panel provided on the display surface, the touch panel detecting contact of an object with the touch panel;
An operation mode control unit that switches an operation mode of the display device between the at least two operation modes,
One of the at least two operation modes is a presentation mode in which an image is displayed on the display surface and various information is presented to an observer of the display unit, and of the at least two operation modes. The other one operation mode is a handwriting input mode in which a character or a figure is input by handwriting by touching the touch panel,
A luminance control unit that controls the display unit so that the luminance of the display surface when operating in the presentation mode is higher than the luminance of the display surface when operating in the handwriting input mode This is a display device.

According to the present invention, the luminance of the display surface when operating in the presentation mode is 500 to 2500 cd / m ² , and the luminance of the display surface when operating in the handwriting input mode is 150 to 300 cd. / M ² .

  The present invention also provides an instruction to instruct the operation mode control unit to switch from the presentation mode to the handwriting input mode or to switch from the handwriting input mode to the presentation mode in response to an input from the outside. It further includes a portion.

  Further, in the present invention, when the operation mode control unit is operating in the handwriting input mode, when the contact of the object with the touch panel is not detected for a predetermined time, the operation mode control unit starts from the handwriting input mode to the presentation mode. It is characterized by switching to.

The present invention also provides a display method for displaying an image on a display unit of a display device capable of operating in at least two operation modes,
One of the at least two operation modes is a presentation mode in which an image is displayed on a display surface of the display unit to present various information to an observer of the display unit, and the at least two operations Another operation mode among the modes is a handwriting input mode in which a character or a figure is input by handwriting by touching a touch panel provided on the display surface,
The operation mode control unit of the display unit switches the operation mode between the at least two operation modes,
The display so that the brightness of the display surface when the brightness control unit of the display unit is operating in the presentation mode is higher than the brightness of the display surface when operating in the handwriting input mode. The display method is characterized by controlling the unit.

  According to the present invention, the operation mode control unit displays the image on the display surface of the display unit and presents various information to the observer, and the handwriting input mode that inputs characters or figures by handwriting on the touch panel Between the display mode and the brightness control unit is configured such that the brightness of the display surface when operating in the presentation mode is higher than the brightness of the display surface when operating in the handwriting input mode. The display unit is controlled as follows.

  As a result, when operating in the presentation mode, the brightness of the display surface is relatively increased so that an observer away from the display device can easily view the image, and when operating in the handwriting input mode, the touch panel is The brightness of the display surface is relatively lowered so that the presenter who is operating is not dazzled, so that a display device suitable for both the observer who views the displayed image and the operator who operates it is provided. be able to.

According to the invention, the luminance of the display surface when operating in the presentation mode is 500 to 2500 cd / m ² , and the luminance of the display surface when operating in the handwriting input mode is 150. ˜300 cd / m ² .

  Further, according to the present invention, the instruction unit instructs to switch between the handwriting input mode and the presentation mode in response to an input from the outside, so that it is possible to prevent unintended switching of the operation mode.

  According to the invention, when the operation mode control unit is operating in the handwriting input mode and the contact of the object with the touch panel has not been detected for a predetermined time, the operation mode control unit starts from the handwriting input mode. Switch to presentation mode.

  As a result, the presenter who has finished the handwriting input can switch to the presentation mode and display an image with high luminance if a predetermined time has elapsed without any operation.

  According to the present invention, a display device is provided between a presentation mode in which an image is displayed on a display surface of a display unit and various information is presented to an observer and a handwriting input mode in which characters or figures are input by hand by touching the touch panel. The display unit is controlled such that the brightness of the display surface when operating in the presentation mode is higher than the brightness of the display surface when operating in the handwriting input mode.

  As a result, when operating in the presentation mode, the brightness of the display surface is relatively increased so that an observer away from the display device can easily view the image, and when operating in the handwriting input mode, the touch panel is The brightness of the display surface is relatively lowered so that the presenter who is operating is not dazzled, so that a display device suitable for both the observer who views the displayed image and the operator who operates it is provided. be able to.

It is a block diagram which shows the structure of the electronic blackboard 1 which is 1st Embodiment of this invention. It is a figure which shows the external appearance of the electronic blackboard 1 of this embodiment. 3 is a flowchart showing luminance control processing of the electronic blackboard 1. It is a flowchart which shows the luminance setting process of presentation mode. It is a flowchart which shows the luminance setting process of handwriting input mode.

  FIG. 1 is a block diagram showing a configuration of an electronic blackboard 1 according to the first embodiment of the present invention. FIG. 2 is a diagram illustrating an appearance of the electronic blackboard 1 according to the present embodiment.

  The electronic blackboard 1 includes a display unit 10, an operation unit 11, a control unit 12, a storage unit 16, and an external connection unit 17. The operation unit 11 is realized, for example, by a touch panel having an operation surface capable of handwriting input of characters and figures. The display unit 10 is realized by, for example, a liquid crystal display. The display unit 10 includes a display control unit 20 and a display element 21 including a display surface 14. The operation unit 11 includes a touch panel interface 22 and a touch panel 23.

  The electronic blackboard 1 is configured to include a display device body 27 and a controller 28. The display device body 27 includes the touch panel 23 of the operation unit 11 and the display element 21 of the display unit 10. The controller 28 includes a control unit 12, a display control unit 20 of the display unit 10, a touch panel interface 22 of the operation unit 11, a storage unit 16, and an external connection unit 17.

  The display device main body 27 is arranged at a position where the operator can visually check, presents the information as an image to the operator, and accepts an operation by the operator.

  The controller 28 is a controller for realizing an image display function, a handwritten character input function, and the like on the electronic blackboard 1, and includes a frame display unit, a character display unit, a locus recognition unit, a determination unit, a character string correction unit, and a frame selection. Part. The controller 28 includes, for example, an image display function such as a moving image and a still image, a function that charts data such as characters and graphics input from the touch panel 23 and combines the data with the above moving image and still image, and a communication function. Has various functions. For example, a dedicated device may be prepared for the controller 28 or may be realized by installing and executing a program for realizing the controller 28 in a general personal computer.

  The display element 21 of the display unit 10 is a display element for visually displaying information on the electronic blackboard 1. For example, the display element 21 of the display unit 10 is realized by a liquid crystal display element (LCD), an organic electroluminescence (EL) element, a cathode ray tube, and a projection display element. If it is a liquid crystal display element, the luminance of the display surface 14 of the display element 21 is appropriately changed by adjusting the amount of light emitted from the backlight or by adjusting the amount of light emitted from the element itself if it is a self-luminous element such as an organic electroluminescence element. can do.

  The display control unit 20 of the display unit 10 processes input image data including a moving image and a still image into a data format for display on the display element 21 and displays the data on the display element 21 of the display unit 10. The display control unit 20 of the display unit 10 may be realized by, for example, a general personal computer graphic card.

  The touch panel 23 of the operation unit 11 is a device for detecting a contact position by the operator. For example, the touch panel 23 of the operation unit 11 is disposed at a position overlapping the display surface 14 of the display element 21 of the display unit 10. The touch panel 23 of the operation unit 11 may be installed on the frame portion of the display element 21 of the display unit 10. The touch panel 23 of the operation unit 11 may use any detection method as long as the contact position by the operator can be detected.

  The touch panel interface 22 of the operation unit 11 is an interface for receiving data from the touch panel 23 of the operation unit 11. As long as the touch panel interface 22 can receive data from the touch panel 23, any method may be used. For example, USB (Universal Serial Bus) and RS232C (Recommended Standard 232 C) can be cited as a method of the touch panel interface 22.

  The storage unit 16 is a frame storage unit that stores application programs used in the electronic blackboard 1 and various data. The storage unit 16 may be used as a work area by components in the electronic blackboard 1. The storage unit 16 includes, for example, a random access memory 25 (Random Access Memory: RAM) that is a volatile storage device and a read only memory 24 (Read Only Memory: ROM) that is a nonvolatile storage device.

  The external connection unit 17 is an interface to which an external device is connected and that captures image data transmitted from the external device. The electronic blackboard 1 can also be used as a large screen display, for example. A personal computer (PC), a recording disk playback device, or the like can be connected as an external device.

  For sending and receiving data between the electronic blackboard 1 and the external device, for example, any method may be used as long as necessary data can be sent and received between the electronic blackboard 1 and the external device. For example, data transmission / reception between the electronic blackboard 1 and the external device may be a wired method or a wireless method. For example, USB (Universal Serial Bus) and RS232C (Recommended Standard 232 C) can be cited as the above-mentioned wired system for data transmission / reception. Further, for example, as the above-described data transmission / reception wireless system, there are a Wi-Fi (Wireless Fidelity) system, a Bluetooth (registered trademark) system, and an NFC (Near field communication) system.

  An operation area 30 and an input display area 31 are set on the display surface 14 of the display unit 10. In the operation area 30, a plurality of icons 7 in a graphical user interface (GUI) are displayed. Various functions for using the electronic blackboard 1 are assigned to the icon 7. For example, a pen function that draws characters and figures when inputting handwritten characters, an eraser function that erases a part of the drawn characters and figures, a storage function that stores display contents as data, and a print that converts the display contents into an image and prints them Includes functionality. Furthermore, combinations of multiple types of colors and line thicknesses drawn when selecting the pen function, specifying a range of a part of the display area, specifying a drag operation for the display content of the specified part, etc. Functions. In the present invention, for example, a function for instructing switching to each operation mode described later is assigned to the icon 7.

  When inputting characters and symbols by handwriting using the electronic blackboard 1, the operator may directly touch the touch panel 23 with a finger or an input auxiliary component such as a touch pen.

  The electronic blackboard 1 of the present invention displays an image on the display surface 14 of the display unit 10, and a presentation mode suitable for a presenter to make a presentation using the displayed image, and the operator touches the touch panel 23. Thus, it is configured to be operable in two operation modes of a handwriting input mode suitable for inputting handwritten characters and symbols.

  In addition to the above two operation modes, it is also possible to operate in various modes such as a PC monitor mode when a PC is connected as an external device, and a moving image display mode for displaying a moving image reproduced by the recording disk reproducing device.

  In the presentation mode, for example, an image based on presentation material data generated by presentation software is displayed on the display surface 14 of the display unit 10, and a person watching the electronic blackboard 1 using the material image displayed by the presenter. This is an operation mode suitable for giving a presentation to the (observer). The presenter must always be near the electronic blackboard 1 in order to make a presentation based on the image displayed on the electronic blackboard 1. In many cases, the observer sees the material image displayed on the display surface 14 of the display unit 10 from a position at a certain distance from the electronic blackboard 1.

  In the presentation mode, the luminance of the display surface 14 is made relatively higher than the luminance of the handwriting input mode in order to improve the visibility when the observer views the document image displayed on the electronic blackboard 1. The higher the brightness of the display surface 14, the better the image displayed on an observer who is far from the electronic blackboard 1 can be seen.

The brightness of the display surface 14 in the presentation mode is, for example, 500 to 2500 cd / m ² . If the luminance of the display surface 14 is lower than 500 cd / m ² , the improvement of visibility by the observer may be insufficient, and if it is higher than 2500 cd / m ^2, the observer is far away from the electronic blackboard 1. However, the display surface 14 may feel dazzling. The luminance of the display surface 14 in the presentation mode may be configured to be changeable within a predetermined range according to the place where the electronic blackboard 1 is installed. When the display board 14 is installed in a relatively large space such as a hall, Since the distance also increases, the brightness is set to be higher within the range, and when installed in a relatively narrow space such as a conference room, the distance to the observer is closer, so the brightness may be set lower within the range.

  Here, when the presenter touches the touch panel 23 of the electronic blackboard 1 and tries to input characters and the like by hand, the presenter views the display surface 14 at a close distance so as to contact the electronic blackboard 1. In the presentation mode, the brightness of the display surface 14 is set high so that even an observer away from the electronic blackboard 1 can see the displayed image as described above. 14 is dazzling and it is difficult to see the image.

  In the electronic blackboard 1 of the present invention, when the operation mode is the handwriting input mode, the luminance of the display surface 14 is relatively lowered, that is, the luminance of the display surface 14 in the handwriting input mode is higher than the luminance of the display surface 14 in the presentation mode. The luminance is also low.

  In the handwriting input mode, the operator of the electronic blackboard 1 who is a presenter always sees an image displayed on the display surface 14 within a range where the touch panel 23 can be touched. It is necessary to maintain such brightness that it is not dazzling and is dark and does not deteriorate visibility.

The luminance of the display surface 14 of the electronic blackboard 1 may be set as appropriate according to the place where the electronic blackboard 1 is installed. The luminance of the display surface 14 in the handwriting input mode is, for example, 150 to 300 cd / m ² . To do. Causes reduced visibility and brightness of the display surface 14 is lower than 150 cd / ^{m 2,} feels dazzling display surface 14 at a distance close presenter from the display surface 14 to be higher than 300 cd / ^{m 2} There is a case. The brightness of the display surface 14 in the handwriting input mode may be configured to be changeable within a predetermined range according to the preference of the operator. If the operator prefers the bright display surface 14 for handwriting input, the brightness is within the range. If the operator prefers a darker display surface 14 for handwriting input, the user may set a lower brightness within the range.

  When the electronic blackboard 1 of the present invention is operating in the presentation mode, the brightness of the display surface 14 is relatively increased so that an observer away from the electronic blackboard 1 can easily view the displayed image, and the handwriting input mode Is operated, the brightness of the display surface 14 is relatively lowered so that the presenter who is the operator who operates the touch panel 23 is not dazzled. Thereby, it is possible to provide the electronic blackboard 1 suitable for both an observer who views the displayed image and an operator who operates the image.

  To switch between the presentation mode in which the brightness of the display surface 14 is relatively increased and the handwriting input mode in which the brightness of the display surface 14 is relatively decreased, the presenter operates the icon 7 to which a function is assigned in advance. It is possible to input a switching instruction with.

  The function assigned to the icon 7 is different from the first function for inputting an instruction for switching from the handwriting input mode to the presentation mode and the second function for inputting an instruction for switching from the presentation mode to the handwriting input mode. The icon 7 may be assigned.

  When the presenter operates by operating the handwriting input mode by touching the icon 7 to which the first function is assigned, an operation mode switching instruction is input, and the operation mode of the electronic blackboard 1 is handwritten. Switch from input mode to presentation mode. When the operation mode is switched from the handwriting input mode to the presentation mode, the brightness of the display surface 14 is increased. When operating in the presentation mode, the icon 7 to which the first function is assigned is disabled.

  When the presenter operates by operating the presentation mode by touching the icon 7 to which the second function is assigned, an operation mode switching instruction is input, and the operation mode of the electronic blackboard 1 is set to the presentation mode. To handwriting input mode. When the operation mode is switched from the presentation mode to the handwriting input mode, the brightness of the display surface 14 is lowered. When operating in the handwriting input mode, the icon 7 to which the second function is assigned is disabled.

  The function assigned to the icon 7 may be a third function for inputting an instruction to switch to an operation mode different from the current operation mode.

  When the presenter operates by operating the handwriting input mode, for example, by touching the icon 7 to which the third function is assigned, an operation mode switching instruction is input, and the operation mode of the electronic blackboard 1 is currently set. Is switched from the handwriting input mode, which is the operation mode, to the presentation mode, which is a different operation mode. When the operation mode is switched from the handwriting input mode to the presentation mode, the brightness of the display surface 14 is increased. When the presenter operates by operating the presentation mode by touching the icon 7 to which the third function is assigned, an operation mode switching instruction is input, and the operation mode of the electronic blackboard 1 is the current mode. The presentation mode which is the operation mode is switched to the handwriting input mode which is a different operation mode. When the operation mode is switched from the presentation mode to the handwriting input mode, the brightness of the display surface 14 is lowered.

  The instruction input by the operation of the icon 7 is an example. If the user can input an instruction to switch the operation mode, a hard key to which an instruction input function is assigned in addition to the soft key is displayed on the electronic blackboard. 1 may be provided, or a touch key capable of communicating with the electronic blackboard 1 may be provided with a hard key to which an instruction input function is assigned.

  As described above, regarding the switching of the operation mode, particularly the switching from the presentation mode to the handwriting input mode, an instruction is input according to the user's operation, in other words, the operation mode is changed unless the user intentionally operates. Since it does not switch, when operating in the presentation mode and the presenter is explaining the displayed document image, the operation mode is switched to the handwriting input mode and the brightness of the display surface 14 is lowered. There is no such thing.

  In the presentation mode, when the presentation material is displayed, if the material is composed of a plurality of pages, an operation for changing the displayed image page such as page feed may be required. In many cases, the specification is such that the page is changed by an operation in which the presenter touches the touch panel 23. Therefore, in the presentation mode, the touch panel 23 may be operated although not handwritten input. During a presentation, there may be a case where it is desired to emphasize a character such as a character underlined in a displayed image by hand, or surrounded by a frame.

  When switching from the presentation mode to the handwriting input mode is configured so that when a handwritten input of a character or a figure is detected, it is switched according to the detection. Or the frame is determined to be a character or a figure, and the mode is switched to the handwriting input mode. In the present invention, switching from the presentation mode to the handwriting input mode is limited to a specific operation by the user such as the icon 7 operation. Therefore, even if the emphasis expression is input by handwriting during the presentation, the handwriting input mode is switched. The luminance of the display surface 14 does not decrease.

  According to the second embodiment of the present invention, in the switching of the operation mode, the switching from the handwriting input mode to the presentation mode is performed based on the judgment of the electronic blackboard 1 in addition to the switching according to the user operation such as the icon 7 operation. It is configured.

  As described above, when switching from the presentation mode to the handwriting input mode, the operation mode is switched at a timing unintended by the presenter during the presentation so that the brightness of the display surface 14 does not decrease. It is preferable to switch accordingly. The switching from the handwriting input mode to the presentation mode is preferably performed based on a predetermined condition without any user operation.

  In this embodiment, when operating in the handwriting input mode, if contact with the touch panel 23 is not detected for a predetermined time, the operation mode is switched from the handwriting input mode to the presentation mode based on the determination of the control unit 12. .

  In the first embodiment, when the presenter wants to input characters by handwriting during the presentation, the icon 7 is operated to switch from the presentation mode to the handwriting input mode, the handwriting input is performed, and the icon 7 is operated again to perform handwriting. Switch from input mode to presentation mode and continue the presentation.

  Particularly during the presentation, the presenter also provides an oral explanation while showing the image displayed on the electronic blackboard 1 to the observer. When the icon 7 is operated to switch from the presentation mode to the handwriting input mode and handwriting input is performed, if the user forgets to operate the icon 7 and starts the verbal explanation, the operation mode is not switched and the display surface 14 is switched. The brightness remains low and the displayed image is difficult to see. In the present embodiment, when a predetermined time (no operation time) elapses after the presenter finishes handwriting input and contact with the touch panel 23 is not detected, the presenter returns from the handwriting input mode to the presentation mode. Even if the operation of the icon 7 has been forgotten, the operation mode is switched, the display mode is restored, and the brightness of the display surface 14 is increased.

  The no-operation time is preferably 5 to 30 seconds, for example, and it is preferable that the user can select and set one time from this range. Even when the user does not select, an initial value (for example, 10 seconds) may be set.

  Also in the present embodiment, as in the first embodiment, it is possible to switch from the handwriting input mode to the presentation mode by operating the icon 7. When the presenter wants to quickly return to the presentation mode after completing the handwriting input, the user switches the handwriting input mode to the presentation mode by operating the icon 7 before the no-operation time elapses.

  In the third embodiment of the present invention, the luminance of the display surface 14 is configured to change gradually according to the switching of the operation mode. The change in the luminance of the display surface 14 is changed quickly according to the response speed of the light source between the luminance L1 set in the presentation mode and the luminance L2 (<L1) set in the handwriting input mode. However, a sudden change in luminance may cause a decrease in visibility.

  In the present embodiment, the change speed of the luminance of the display surface 14 is made slower than the response speed of the light source. When switching from the handwriting input mode to the presentation mode, assuming that the time for changing from L2 to L1 is t1, the luminance change speed v1 is expressed by (L1-L2) / t1. By setting the time t1 to be longer than the response speed of the light source, the luminance change can be moderated. Although it depends on the luminance difference (L1-L2), the time t1 may be set to 1 to 5 seconds, for example.

  The same applies to the case where the presentation mode is switched to the handwriting input mode. If the time for changing from L1 to L2 is t2, the luminance change speed v2 is represented by (L2-L1) / t2. The time t2 may be set to 1 to 5 seconds, for example, similarly to t1. v1 and v2 may be the same (t1 = t2) or different (t1 ≠ t2).

  Further, the change speed of the luminance change accompanying the switching of the operation mode is not limited to the speed represented by the linear function as described above, and may be a speed represented by a quadratic function or an exponential function. Further, the luminance change may be an intermittent and step-like change instead of a continuous change.

  FIG. 3 is a flowchart showing the luminance control processing of the electronic blackboard 1. First, in step S1, an operation by the user is input to the electronic blackboard 1. In step S2, if no operation is performed in step S1, information indicating whether the previous operation was an operation related to the presentation mode is held, and the process proceeds to the next step.

  In step S3, it is determined whether the operation is related to the presentation mode. The operations related to the presentation mode are operations that are performed while the presentation mode is continued, such as an icon 7 operation for inputting an instruction to switch from the handwriting input mode to the presentation mode, page turning when operating in the presentation mode, and highlighting. This is an operation excluding an icon 7 operation for inputting a switching instruction from the presentation mode to the handwriting input mode, an operation for inputting an operation end instruction, and the like.

  If the operation is related to the presentation mode, the process proceeds to step S4, and if not, the process proceeds to step S5. In step S4, brightness setting processing in presentation mode is performed, and in step S5, brightness setting processing in handwriting input mode is performed. In step S6, it is determined whether or not an operation for inputting an end command for instructing the end of the operation is performed. If an end command has been input, the process ends. If the end command is not input, the process proceeds to step S7. In step S <b> 7, various processes corresponding to the operation contents performed by the user are executed.

  FIG. 4 is a flowchart showing the brightness setting process in the presentation mode, and FIG. 5 is a flowchart showing the brightness setting process in the handwriting input mode. In the brightness setting process in the presentation mode, it is determined in step A1 whether or not the current brightness of the display surface 14 has reached the brightness L1 set as the brightness in the presentation mode. If it has reached, the setting process is terminated, and if not, the process proceeds to step A2. In this flow, the luminance of the display surface 14 is increased in steps in a plurality of stages. In step A2, the luminance is increased by n steps (n is a natural number) with respect to the current luminance.

  When the brightness setting process in the presentation mode is executed during the operation in the presentation mode, the brightness of the display surface 14 is the set brightness L1, and therefore it is determined in step A1 that the brightness has reached the set brightness L1. The setting process is terminated without changing.

  In the brightness setting process in the handwriting input mode, it is determined in step B1 whether the current brightness of the display surface 14 has reached the brightness L2 set as the brightness in the handwriting input mode. If it has reached, the setting process is terminated, and if not, the process proceeds to step B2. In this flow, the brightness of the display surface 14 is decreased in a stepped manner in a plurality of stages. In step B2, the luminance is lowered by n steps (n is a natural number) with respect to the current luminance.

  When the brightness setting process in the handwriting input mode is executed during the operation in the handwriting input mode, the brightness of the display surface 14 is the set brightness L2, and therefore it is determined in step B1 that the set brightness L2 has been reached. Then, the setting process ends without changing the luminance.

DESCRIPTION OF SYMBOLS 1 Electronic blackboard 7 Icon 10 Display part 11 Operation part 12 Control part 14 Display surface 16 Storage part 17 External connection part 20 Display control part 21 Display element 22 Touch panel interface 23 Touch panel 24 Read only memory 25 Random access memory 27 Display apparatus main body 28 Controller 30 Operation area 31 Input display area

Claims (5)

A display device capable of operating in at least two operating modes,
A display unit having a display surface for displaying an image, wherein the display unit is configured to change the luminance of the display surface;
A touch panel provided on the display surface, the touch panel detecting contact of an object with the touch panel;
An operation mode control unit that switches an operation mode of the display device between the at least two operation modes,
One of the at least two operation modes is a presentation mode in which an image is displayed on the display surface and various information is presented to an observer of the display unit, and of the at least two operation modes. The other one operation mode is a handwriting input mode in which a character or a figure is input by handwriting by touching the touch panel,
A luminance control unit that controls the display unit so that the luminance of the display surface when operating in the presentation mode is higher than the luminance of the display surface when operating in the handwriting input mode A display device characterized by that. The brightness of the display surface when operating in the presentation mode is 500 to 2500 cd / m ² , and the brightness of the display surface when operating in the handwriting input mode is 150 to 300 cd / m ² . The display device according to claim 1.   And an instruction unit that instructs the operation mode control unit to switch from the presentation mode to the handwriting input mode or to switch from the handwriting input mode to the presentation mode in response to an input from the outside. The display device according to claim 1 or 2.   When the operation mode control unit is operating in the handwriting input mode and the contact of the object with the touch panel is not detected for a predetermined time, the operation mode control unit switches from the handwriting input mode to the presentation mode. The display device according to claim 1, wherein the display device is a display device. A display method for displaying an image on a display unit of a display device capable of operating in at least two operation modes,
One of the at least two operation modes is a presentation mode in which an image is displayed on a display surface of the display unit to present various information to an observer of the display unit, and the at least two operations Another operation mode among the modes is a handwriting input mode in which a character or a figure is input by handwriting by touching a touch panel provided on the display surface,
The operation mode control unit of the display unit switches the operation mode between the at least two operation modes,
The display so that the brightness of the display surface when the brightness control unit of the display unit is operating in the presentation mode is higher than the brightness of the display surface when operating in the handwriting input mode. The display method characterized by controlling a part.

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