Display device

Abstract

To provide a display device that can efficiently clean a target object.SOLUTION: A controller (2) changes the display state in a display region (31) in a first change range, and changes the display state in a second change range narrower than the first change range on the basis of the timing when an operation receiving unit (4) received a starting operation for starting cleaning of the surface of the display region (31) as an operation while the display state is being changed in the first change range.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a display device that makes it easy for a user to clean the display area. [Background technology]

[0002] Patent Document 1 discloses a technique for sequentially switching between a number of different images and displaying them on a display when a cleaning mode for cleaning the screen of a display device is set. In this technique, for example, a number of cleaning images of different colors are displayed on the entire screen at a predetermined cycle in a predetermined order, and when a stop operation is performed, the image change is stopped. Patent Document 1 claims that this makes it possible to highlight and clean (remove) cleaning targets such as dirt on the screen and dust and other debris adhering to the screen. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-32679 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional technology described above, when a user performs a stop operation when he or she finds a cleaning target, there is a slight time difference between the discovery of the cleaning target and the stop operation. Therefore, even if the image change is stopped by the stop operation, if the image has already been changed, the image when the user finds the cleaning target will be different from the image when the image change is stopped. In such a case, the cleaning target may not be easily noticeable in the image when the image change is stopped. As a result, the conventional technology has a problem that the cleaning target cannot be easily cleaned, and the cleaning work of the cleaning target cannot be performed efficiently.

[0005] An object of one embodiment of the present invention is to provide a display device that enables efficient cleaning of an object to be cleaned. [Means for solving the problem]

[0006] In order to solve the above problems, a display device according to one embodiment of the present invention includes an operation receiving unit that receives operations by a user, a display unit having a display area, and a control unit that changes the display state based on predetermined operation information related to the display state in the display area, and the control unit changes the display state within a first change range based on the operation information, and, when the display state is changing within the first change range, changes the display state within a second change range narrower than the first change range based on the operation information, based on the timing at which the operation receiving unit receives a start operation to start cleaning the surface of the display area as the operation.

[0007] According to the above configuration, the display state in the display area changes in the first change range, so that the cleaning target can be easily found in any of the changing display states. When the user performs an operation to start cleaning when he or she finds the cleaning target, the control unit changes the display state in the second change range that is narrower than the first change range. This makes it possible to maintain a display state in the display area that is close to the display state when the cleaning target was found. Therefore, the cleaning target can be easily cleaned, and the cleaning work for the cleaning target can be performed efficiently.

[0008] It should be noted that the first change range and the second change range here do not include the case where they are 0. In other words, when the display state is changing in the first change range or the second change range, the display state changes in the corresponding first change range or second change range without stopping.

[0009] In the display device, the control unit may change the display color as the display state within the first change range or the second change range.

[0010] According to the above configuration, the display color changes within the first change range or the second change range, making it easier to find the cleaning target.

[0011] In the display device, the control unit may display a screen including specified display information in the display area, and display a transparent image superimposed on the screen, and change the transmittance of the transparent image as the display state within the first change range or the second change range.

[0012] According to the above configuration, the transmittance of the transparent image superimposed on the screen changes within the first change range or the second change range, making it easier to find the cleaning target while keeping the screen displayed. This allows the surface of the display area to be cleaned while monitoring the screen.

[0013] In the display device, the control unit may display a plurality of the transmission images in a superimposed manner on the screen, and change the transmittance of at least one of the transmission images within the first change range or the second change range as the display state.

[0014] According to the above configuration, the transmittance of at least one of the multiple transparent images superimposed on the screen can be changed while the transmittance of the other transparent images can be fixed, thereby making it possible to set various transmittances based on the transmittances of the multiple transparent images.

[0015] In the display device, the control unit may display one dark-colored transmitted image and one light-colored transmitted image as the multiple transmitted images by superimposing them on the screen, and change the transmittance of only one of the transmitted images within the first change range or the second change range.

[0016] According to the above configuration, the transmittance of only one of the dark and light colored transmitted images is changed, and the display state can be changed from dark to light or from light to dark in the transmitted state through the screen, making it easier to find the cleaning target.

[0017] In the display device, the operation receiving unit may include a touch panel, and the control unit may display an operation screen that receives operations via the touch panel as the screen, and may disable operation of the operation screen via the touch panel when the display state is changing within the first change range or the second change range.

[0018] According to the above configuration, when cleaning a cleaning target, operations on the operation screen via the touch panel are disabled. This makes it possible to prevent touching the touch panel during cleaning from being recognized as an operation on the operation screen, and thus makes it possible to suppress erroneous operations on the touch panel.

[0019] In the display device, the control unit may maintain the change in the display state within the second change range for a predetermined period from the timing when the operation receiving unit receives an end operation to end cleaning as the operation, or for a period until the end operation is received.

[0020] According to the above configuration, after cleaning is completed during the above period, it is possible to easily check whether or not any cleaning targets remain on the display screen, thereby making it possible to more reliably clean the cleaning targets.

[0021] In the display device, the control unit may change the display state in the form when the operation receiving unit receives as the operation an operation to change the form in which the display state changes within the second change range.

[0022] According to the above configuration, since the manner in which the display state changes is variable, by moving the area in which the display state changes or by increasing the range of change in the display state, it is possible to more easily check whether there are any cleaning targets remaining on the display area after cleaning, thereby shortening the time required for checking.

[0023] In addition, a display device according to another aspect of the present invention includes an operation receiving unit that receives operations by a user, a display unit having a display area, and a control unit that changes the display state based on predetermined operation information related to a display state in the display area, and the control unit causes a screen including specified display information to be displayed in the display area based on the operation information, and also causes a transparent image to be displayed so as to be superimposed on the screen, and changes the transmittance of the transparent image within a specified change range as the display state, and while the display state is changing within the change range, stops the change in the display state based on the timing at which the operation receiving unit receives a start operation to start cleaning a surface of the display area as the operation, and displays the transparent image at the transmittance at which the change in the display state was stopped.

[0024] According to the above configuration, the change in the display state is stopped from a specified change range based on the timing when the start operation is received, and the transmitted image is displayed at the transmittance at the time when the change in the display state is stopped, making it easier to make the target to be cleaned stand out.

[0025] In the display device, the control unit may display a plurality of the transparent images in a superimposed manner on the screen, change a transmittance of at least one of the transparent images within the change range as the display state, and display the transparent image at the transmittance at which the change of the display state is stopped.

[0026] According to the above configuration, the transmittance of at least one of the multiple transparent images superimposed on the screen can be changed and the at least one transparent image can be displayed at the transmittance at which the change in the display state is stopped, while the transmittances of the other transparent images can be fixed, thereby making it possible to set a variety of transmittances based on the transmittances of the multiple transparent images.

[0027] In the display device, the control unit may display one dark-colored transmitted image and one light-colored transmitted image as the plurality of transmitted images in a superimposed manner on the screen, change the transmittance of only one of the transmitted images within the change range, and display the transmitted image at the transmittance when the change in the display state is stopped.

[0028] According to the above configuration, the transmittance of only one of the dark and light colored transmitted images is changed, and the transmitted image is displayed at the transmittance when the change in the display state is stopped, and the display state can be changed from dark to light or from light to dark while the screen is being transmitted, thereby making it easier to find the cleaning target.

[0029] In the display device, the operation receiving unit includes a touch panel, and the control unit may display an operation screen that accepts operations via the touch panel as the screen, and may disable operation of the operation screen via the touch panel when the display state is being changed within the change range or when the change of the display state is stopped.

[0030] According to the above configuration, when cleaning a cleaning target, operations on the operation screen via the touch panel are disabled. This makes it possible to prevent touching the touch panel during cleaning from being recognized as an operation on the operation screen, and thus makes it possible to suppress erroneous operations on the touch panel.

[0031] In the display device, the control unit may display the transparent image at the transmittance when the change in the display state was stopped for a predetermined period of time from when the operation accepting unit accepts an end operation to end cleaning as the operation, or for a period of time until the end operation is accepted.

[0032] According to the above configuration, after cleaning is completed during the above period, it is possible to easily check whether or not any cleaning targets remain on the display screen, thereby making it possible to more reliably clean the cleaning targets. Effect of the Invention

[0033] According to one aspect of the present invention, a display device that enables efficient cleaning of an object to be cleaned can be provided. [Brief description of the drawings]

[0034] [Figure 1] 1 is a block diagram showing a configuration of a programmable display device according to a first embodiment of the present invention. [Diagram 2] 13 is a diagram showing a specific example of the configuration of a display screen of the programmable display device in a cleaning mode. FIG. [Diagram 3] 5 is a flowchart showing an example of the operation of the programmable display device. [Figure 4] 11A to 11C are diagrams illustrating specific display operations in a cleaning mode of the programmable display device. [Diagram 5] 13 is a diagram showing an example of an operation in the cleaning mode when the display state in the display area is changed within a first change range. FIG. [Figure 6] 13A to 13C are diagrams illustrating an example of an operation when the display state is changed within a first change range and a second change range. [Figure 7] 13 is a diagram showing an example of an operation when the display state of the programmable display device according to the first modification is changed within a first change range and a second change range. FIG. [Figure 8] 13 is a diagram showing an example of an operation when the display state of a programmable display device according to Modification 2 is changed within a first change range and a second change range. FIG. [Figure 9] 13 is a diagram showing an example of an operation when the display state of a programmable display device according to Modification 3 is changed within a first change range and a second change range. FIG. [Figure 10] FIG. 13 is a diagram showing a specific display operation in a cleaning mode of a device according to Modification 4. [Figure 11] 13 is a diagram showing a specific display operation in a cleaning mode of the programmable display device according to the fifth modification. FIG. [Figure 12] 12 is a flowchart showing an example of the operation of the programmable display device shown in FIG. [Figure 13] 13 is a flowchart showing an example of the operation of a programmable display device according to Modification 6. [Figure 14] 14 is a diagram showing a specific display operation in a cleaning mode of the programmable display device shown in FIG. 13. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] [Embodiment 1] An embodiment of the present invention will be described in detail below. In the following description, the present invention will be described by taking as an example a case where the present invention is applied to a programmable display device. However, the present invention is not limited to a display device having a display unit with a display area, and the present invention can also be applied to a television receiver, a mobile terminal such as a tablet terminal or a smartphone, or an information processing terminal such as a personal computer.

[0036] <Programmable display unit 1 configuration> 1 is a block diagram showing a configuration of a programmable display device 1 according to a first embodiment of the present invention. As shown in FIG. 1, the programmable display device 1 includes a control unit 2, a display unit 3, an operation receiving unit 4, a storage unit 5, and an interface unit 6.

[0037] The programmable display device 1 communicates with the PLC 7 by being connected to the PLC 7 via a communication cable. The programmable display device 1 is a dedicated computer that realizes operation functions and display functions unique to the programmable display device by displaying a drawing screen for operation and display, and is used as an HMI (Human Machine Interface) device.

[0038] The control unit 2 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory) in order to control each part of the programmable display device 1. The control unit 2 also specifies an operation to display the state of the device 8 connected to the PLC 7 as an HMI screen on the display unit 3, and an operation to control the state of the device 8 in response to an operation on a touch panel 4T included in the operation reception unit 4. The control unit 2 may execute an application program like a general-purpose personal computer, and cause the display unit 3 to display a screen obtained as a result of the execution (application execution screen).

[0039] The display unit 3 includes a flat display panel such as a liquid crystal panel or an organic electroluminescence panel. The display panel includes a large number of display elements and a transparent plate made of a material such as glass or plastic having translucency, which holds the display elements, and transmits display contents (screen, image, etc.) expressed as a collection of states of the display elements. The display unit 3 has a region in which the display contents are displayed as a display region 31. The display region 31 is the display surface of the display panel, and the surface may or may not be covered by a touch panel 4T (overlay type) described later or a protective film (not shown). The display unit 3 is configured to execute a display operation of a cleaning mode for a user to find cleaning targets such as dirt on the surface of the display region 31, dust, dirt, etc. attached to the surface of the display region 31 according to an instruction from the control unit 2 (details will be described later).

[0040] The operation reception unit 4 receives operations from a user. The operation reception unit 4 includes a touch panel 4T, and may also include operation buttons, a keyboard, and the like provided near the display area 31. If the touch panel 4T is an overlay type, it is disposed on the display area 31 of the display unit 3. The touch panel 4T receives (touch) operations by the user on the screen displayed in the display area 31. If the touch panel 4T is an embedded type, it is embedded in the display area 31 of the display unit 3. The operation reception unit 4 also receives operation commands from an operation terminal received by an interface unit 6 described later.

[0041] The storage unit 5 stores various data used by the control unit 2. Specifically, the storage unit 5 stores predetermined operation information related to the display state in the display area 31 in the cleaning mode. The storage unit 5 stores screen data such as an HMI screen prepared in advance to be displayed on the display unit 3, image data to be displayed on the display unit 3 in the cleaning mode, and the like. The storage unit 5 may also store application programs.

[0042] During execution of the cleaning mode, the control unit 2 changes the display state in the display area 31 within a first change range based on first operation information included in the operation information stored in the storage unit 5. During execution of the cleaning mode, the control unit 2 changes the display state in the display area 31 within a second change range narrower than the first change range based on second operation information included in the operation information stored in the storage unit 5. Furthermore, in the programmable display device 1 of this embodiment, the control unit 2 displays at least one transmissive image in the display area 31, and changes the transmittance of the at least one transmissive image within the first change range or the second change range as the display state in the display area 31 (details will be described later).

[0043] The interface unit 6 includes a connection unit for communicatively connecting the PLC 7. The interface unit 6 includes a connection unit for communicatively connecting an operation terminal such as a remote controller, a mobile terminal, or an information processing terminal. In addition to the above description, one interface unit 6 may be used for multiple purposes, or multiple interface units 6 may be provided for multiple purposes.

[0044] <Display screen in cleaning mode on programmable display unit 1> FIG. 2 is a diagram showing a specific example of the configuration of a display screen in the cleaning mode of the programmable display device 1. As shown in FIG. 2, when the cleaning mode is executed in the programmable display device 1 of this embodiment, the control unit 2 displays a screen 41a including specified display information in the display area 31. Examples of the screen 41a include the above-mentioned HMI screen and application execution screen. Furthermore, the control unit 2 displays at least one, for example, two transparent images 41b and 41c in the display area 31 so as to be superimposed on the screen 41a, and the display area 31 becomes a superimposed screen 41 in which a plurality of images are superimposed. The transparent images 41b and 41c each constitute a semi-transparent screen, and are images whose transmittance is changed independently of each other according to an instruction from the control unit 2. The transparent image 41c is located on the front side of the display area 31, and the transparent image 41b is located on the back side of the display area 31.

[0045] The control unit 2 creates one display screen data by expanding the data of the screen 41a and the transmitted images 41b and 41c in a video RAM (not shown) so as to be superimposed on each other, and provides the data to the display unit 3. The video RAM may be provided as a part of the RAM in the control unit 2, or may be provided outside the control unit 2.

[0046] <Programmable display unit 1 operation example> Fig. 3 is a flowchart showing an example of the operation of the programmable display device 1. Fig. 4 is a diagram showing a specific display operation in the cleaning mode of the programmable display device 1. Fig. 5 is a diagram showing an example of the operation in the cleaning mode when the display state in the display area 31 is changed in a first change range. Fig. 6 is a diagram showing an example of the operation when the display state is changed in the first change range and the second change range.

[0047] As shown in step S1 of Fig. 3, the control unit 2 determines whether the operation reception unit 4 has received a first transition operation as a transition instruction for transitioning from the normal display mode to the cleaning mode. If the control unit 2 determines that the operation reception unit 4 has not received the transition operation (NO in step S1), the control unit 2 goes into a standby state. The first transition operation may be an operation on the operation reception unit 4 including the touch panel 4T, or may be an operation on the above-mentioned operation terminal.

[0048] On the other hand, if the control unit 2 determines that the operation reception unit 4 has received the first transition operation (YES in step S1), the control unit 2 executes the cleaning mode (step S2). In this cleaning mode, the control unit 2 changes the display state in the display area 31 within a first change range based on the operation information stored in the storage unit 5.

[0049] 2, for example, the control unit 2 causes a superimposed screen 41 including two transparent images 41b and 41c to be displayed in the display area 31. Furthermore, the control unit 2 changes the transmittance of at least one of the two transparent images 41b and 41c within a first change range as the above-mentioned display state based on first operation information included in the operation information.

[0050] Next, the control unit 2 determines whether the operation reception unit 4 has received a second transition operation for transitioning from the cleaning mode to the normal display mode as an instruction to end the cleaning mode (step S3). If the control unit 2 determines that the operation reception unit 4 has received the second transition operation, that is, that there has been an instruction to end the cleaning mode (YES in step S3), the control unit 2 ends the execution of the cleaning mode and transitions to the normal display mode (normal mode) (step S7). The second transition operation may be the same as or different from the first transition operation, and may be an operation on the operation reception unit 4 including the touch panel 4T, or may be an operation on the above-mentioned operation terminal.

[0051] On the other hand, if the control unit 2 determines that the operation reception unit 4 has not received the second transition operation, that is, that there has been no instruction to end the cleaning mode (NO in step S3), the control unit 2 proceeds to step S4.

[0052] Next, the control unit 2 determines whether the operation reception unit 4 has received a start operation for starting cleaning of the surface of the display area 31 as an operation (step S4). If the control unit 2 determines that the operation reception unit 4 has not received the start operation (NO in step S4), the control unit 2 returns to step S3. The start operation is an operation different from the first transition operation and a second transition operation described later, and may be an operation on the operation reception unit 4 including the touch panel 4T, or may be an operation on the above-mentioned operation terminal.

[0053] On the other hand, if the control unit 2 determines that the operation receiving unit 4 has received the start operation (YES in step S4), the control unit 2 performs a narrowing operation to change the display state in the display region 31 within a narrow range (step S5). Specifically, the control unit 2 changes the transmittance of at least one of the two transmitted images 41b and 41c within the second change range as the above-mentioned display state based on the second operation information included in the operation information.

[0054] Next, the control unit 2 determines whether the operation reception unit 4 has received an instruction to end the constriction operation (end operation) (step S6). If the control unit 2 determines that the operation reception unit 4 has not received the end operation (NO in step S6), the control unit 2 goes into a standby state. The end operation is different from the first transition operation and the second transition operation described below, and is the same or different from the start instruction, and may be an operation on the operation reception unit 4 including the touch panel 4T, or may be an operation on the above-mentioned operation terminal. The control unit 2 changes the transmittance within the second change range until it determines that the operation reception unit 4 has received the end operation.

[0055] On the other hand, if the control unit 2 determines that the operation reception unit 4 has received the end operation (YES in step S6), the control unit 2 returns to step S2.

[0056] Furthermore, when a touch panel 4T is used as the operation reception unit 4, the control unit 2 displays an operation screen that receives operations via the touch panel 4T, for example, as the above-mentioned screen 41a. In this case, the control unit 2 may disable operations on the operation screen via the touch panel 4T while the display state is being changed within the first change range or the second change range. In this case, operations on the operation screen via the touch panel 4T are disabled when cleaning the cleaning target. This makes it possible to prevent touching the touch panel 4T during cleaning from being recognized as an operation on the operation screen, and to suppress erroneous operations on the touch panel 4T.

[0057] <Cleaning mode> Next, the display operation in the cleaning mode of the programmable display device 1 of this embodiment will be specifically described with reference to Figs.

[0058] 4, in the cleaning mode, a cleaning preparation period and a cleaning operation period are alternately performed, and at least a cleaning preparation period, a cleaning operation period following the cleaning preparation period, and a cleaning operation period following the cleaning operation period are performed. The cleaning preparation period is a period during which the control unit 2 changes the display state in the display area 31 within a first change range based on the first operation information, and is a period during which the user finds a cleaning target in the display area 31.

[0059] Specifically, the control unit 2 fixes the transmittance of the transparent image 41b on the back side of the display area 31, of the two transparent images 41b and 41c shown in FIG. 2, at a constant transmittance (e.g., 10%). On the other hand, the control unit 2 periodically changes the transmittance of the transparent image 41c on the front side (the side viewed by the user) of the display area 31 within a first change range (e.g., a range of 1.0% to 91.0%) based on the first operation information stored in the storage unit 5. Note that the transparent images 41b and 41c become completely opaque images when the transmittance is 0%, and become completely transparent images when the transmittance is 100%. From this viewpoint, in this embodiment, the transparent images 41b and 41c are referred to as semi-transparent screens, as described above.

[0060] More specifically, the control unit 2 periodically changes the transmittance of the transmitted image 41c within a first change range based on the first operation information, as shown by a straight line 50 in Fig. 5. Here, the first operation information includes a period C1, a maximum transmittance Max1 (91.0%), and a minimum transmittance Min1 (1.0%). In order to periodically change the transmittance in this manner, a method of periodically changing the transmittance according to a sine curve, a cosine curve, or the like can be applied in addition to a method of periodically adding or subtracting a predetermined ratio calculated by a linear function as shown in Fig. 5 using the first operation information as described above.

[0061] That is, the control unit 2 changes the transmittance of the transmitted image 41c within a change range W1 (first change range) defined by the maximum transmittance Max1 (91.0%) and the minimum transmittance Min1 (1.0%) between time points T1 and T2, using the period C1 included in the first operation information. Also, the control unit 2 changes the transmittance based on a linear function, as shown by a straight line 50 in Fig. 5, using the rate of change in the transmittance (e.g., ±1.0%) and the speed of change in the transmittance (e.g., 0.05 sec) included in the first operation information. In this case, the period C1 is 9.0 sec (=(91.0-1.0) / 1.0) x 0.05 x 2).

[0062] The cleaning operation period is a period that is set based (triggered) on the timing when the user discovers a cleaning target in the display area 31 during the cleaning preparation period and the operation acceptance unit 4 accepts a start operation by the user to start cleaning the surface of the display area 31. During this period, the user performs work to clean the discovered cleaning target. This cleaning operation period is also a period during which the control unit 2 changes (constricts) the display state in the display area 31 within the second change range based on the second operation information, and the display state is close to the display state when the cleaning target was discovered, allowing the user to easily clean the cleaning target.

[0063] During the cleaning operation period, the control unit 2 determines the maximum and minimum transmittance values ​​for the pre-trigger set time (e.g., 0.80 sec) and post-trigger set time (e.g., 0.15 sec) included in the second operation information. For example, in FIG. 6, the trigger for accepting the start operation occurs at time T3 when the transmittance of the transmission image 41c is 40%. In this case, the control unit 2 determines the maximum transmittance Max2 to be the transmittance of 56.0% at time T4, which is 0.80 sec before the time T3 and is the pre-trigger set time. The control unit 2 also determines the minimum transmittance Min2 to be the transmittance of 37.0% at time T5, which is 0.15 sec after the time T3 and is the post-trigger set time. The second change range is determined by the sum of the pre-trigger set time and the post-trigger set time. In this example, the second change range is determined to be 0.95 sec (=0.80 sec+0.15 sec).

[0064] Then, the control unit 2 changes the transmittance of the transmission image 41c in a change range W2 (second change range) defined between the maximum transmittance Max2 and the minimum transmittance Min2 at a period C2 shorter than the period C1, as shown by a straight line 60 in FIG. 6. After that, when the operation reception unit 4 receives an instruction to end the constriction operation at time T6, the control unit 2 changes the transmittance of the transmission image 41c from the second change range to the first change range. Note that the period C2 is, for example, the time between time T5 and time T5E, and is twice the sum of the pre-trigger set time and the post-trigger set time. In the above example, the period C2 is 1.9 sec (=(0.80 sec+0.15 sec)×2).

[0065] Since it takes a certain amount of time for the user to find the cleaning target and perform the start operation, the transmittance changes during that time. In consideration of this point, it is preferable to set the pre-trigger set time longer than the post-trigger set time. However, it is needless to say that the pre-trigger set time and the post-trigger set time are not limited to these settings.

[0066] As described above, in the programmable display device 1 of the present embodiment, the control unit 2 changes the display state in the display area 31 in the second change range narrower than the first change range in the first change range based on the operation information, based on the timing when the operation receiving unit 4 receives a start operation for starting cleaning the surface of the display area 31 as an operation while the display state in the display area 31 is changing in the first change range. In this way, in the programmable display device 1 of the present embodiment, since the display state in the display area 31 changes in the first change range, it becomes easier to find the cleaning target in any of the changing display states. Also, if the user performs a start operation to start cleaning when he or she finds the cleaning target, the control unit 2 changes the display state in the second change range narrower than the first change range. As a result, in the programmable display device 1 of the present embodiment, it is possible to continue the display state in the display area 31 that is close to the display state when the cleaning target was found. Therefore, in the programmable display device 1 of the present embodiment, the cleaning target can be easily cleaned, and the cleaning work for the cleaning target can be efficiently performed.

[0067] In addition, in the programmable display device 1 of this embodiment, the control unit 2 displays the screen 41a including the specified display information in the display area 31, and displays the transparent images 41b and 41c so as to be superimposed on the screen 41a, and changes the transmittance of the transparent images 41b and 41c in the display state within the first change range or the second change range. As a result, in the programmable display device 1 of this embodiment, the transmittance of the transparent images 41b and 41c superimposed on the screen 41a changes within the first change range or the second change range, making it easier to find the cleaning target while keeping the screen 41a displayed. As a result, in the programmable display device 1 of this embodiment, the display area 31 can be cleaned while monitoring the screen 41a.

[0068] In addition, in the programmable display 1 of the present embodiment, a plurality of, for example, two, transparent images 41b and 41c are displayed superimposed on the screen 41a, and the transmittance of at least one of the transparent images 41c is changed in a first change range or a second change range as a display state. As a result, in the programmable display 1 of the present embodiment, the transmittance of at least one of the transparent images 41b and 41c superimposed on the screen 41a is changed, and the transmittance of the other transparent image 41b is fixed. In this way, in the programmable display 1 of the present embodiment, various transmittances can be set based on the transmittances of the plurality of transparent images 41b and 41c.

[0069] In the above description, the control unit 2 fixes the transmittance of one of the multiple transmission images 41b and 41c at a constant transmittance and changes the transmittance of the other transmission image 41c within a first change range. However, the present embodiment is not limited to this. For example, one dark-colored (e.g., black) transmission image 41b and one light-colored (e.g., white) transmission image 41c may be displayed superimposed on the screen 41a, and only the transmittance of one of the transmission images 41c may be changed within the first change range or the second change range. In this case, only the transmittance of one of the dark-colored transmission image 41b and the light-colored transmission image 41c changes, and the display state can be changed from dark to light or from light to dark in a state where the screen is transmitted. This makes it easier to find the cleaning target.

[0070] In this embodiment, the programmable display 1 is used as the display device, but the present invention can be applied to a display device that does not have a touch panel 4T. For example, a display device installed at a high place in a station or a commercial facility does not have a touch panel, but is configured to switch the display information by operating a remote control, a wireless mobile terminal, or the like. Even with such a display device, a transition between the normal display mode and the cleaning mode, and a switching between the first change range and the second change range can be performed by performing a predetermined operation when a cleaning target is found.

[0071] [Variation 1] Modification 1 of the present invention will be specifically described with reference to Fig. 7. Fig. 7 is a diagram showing an example of operation when the display state of the programmable display device according to Modification 1 is changed within a first change range and a second change range. For ease of explanation, the same reference numerals are given to members having the same functions as those described in the above embodiment, and the explanations thereof will not be repeated. This also applies to Modifications 2 to 8 below.

[0072] The present modified example 1 is mainly different from the above-mentioned embodiment 1 in that the method of determining the maximum transmittance Max11 and the minimum transmittance Min11 in the second change range is different from the method of determining the maximum transmittance Max1 and the minimum transmittance Min1 in the second change range. That is, in the present modified example 1, the control unit 2 determines the maximum transmittance Max11 and the minimum transmittance Min11 based on the rate of change in the transmittance before and after the trigger, which is included in the second operation information.

[0073] Specifically, the pre-trigger change rate is a first value P1 (e.g., 16%) that is predetermined in the direction opposite to the change direction of the transmittance (i.e., the increasing direction in which the transmittance increases or the decreasing direction in which the transmittance decreases), and the post-trigger change rate is a second value P2 (e.g., 3%) that is predetermined in the same direction as the change direction of the transmittance.

[0074] For example, assume that the trigger for accepting the start operation occurs at time T7 when the transmittance Tr11 of the transmitted image 41c is decreasing in the first change range and is 45%, as shown by the straight line 65 in Fig. 7. In this case, the control unit 2 determines the maximum transmittance Max11 to be 61% by adding 16% of the first value P1 to the transmittance Tr11. Also, the control unit 2 determines the minimum transmittance Min11 to be 42% by subtracting 3% of the second value P2 from the transmittance Tr11.

[0075] The control unit 2 changes the transmittance of the transmitted image 41c within a change range W3 (second change range) defined between the maximum transmittance Max11 and the minimum transmittance Min11, with one cycle defined as a period from time T8 to time T9 being a cycle C3. Since it takes 0.05 sec for the transmittance to change by 1% in the transmitted image 41c, the time for one cycle is 1.9 sec (=(61-42)×0.05×2).

[0076] With the above configuration, the programmable display device 1 of the present modified example 1 has the same effect as the programmable display device 1 of the embodiment 1. In addition to this description, similar to modified examples 2 and 3 described later, when the transmittance of the transmitted image 41c at the time of the occurrence of the trigger is near the maximum transmittance Max1 or the minimum transmittance Min1 in the first change range, the first value P1 and the second value P2 may not be used. In this case, specifically, the change width of the second change range may be set to a fixed value (for example, 19% (=16%+3%)) to determine the maximum transmittance Max11 and the minimum transmittance Min11 of the second change range.

[0077] [Modification 2] Modification 2 of the present invention will be specifically described with reference to Fig. 8. Fig. 8 is a diagram showing an example of an operation when the display state of a programmable display device according to Modification 2 is changed within a first change range and a second change range.

[0078] The present modified example 2 is mainly different from the above-mentioned embodiment 1 in that the method of determining the maximum transmittance Max3 and the minimum transmittance Min3 in the second change range is different from the method of determining the maximum transmittance Max1 and the minimum transmittance Min1 in the second change range. That is, in the present modified example 2, when the transmittance of the transmitted image 41c at the time of the occurrence of the trigger is, for example, near the minimum transmittance Min1 in the first change range, the control unit 2 sets the minimum transmittance Min1 as the minimum transmittance Min3 in the second change range.

[0079] For example, assume that the trigger for accepting the start operation occurs at time T13 when the transmittance of the transmitted image 41c is near the minimum transmittance Min1, as shown by a straight line 70 in Fig. 8. In this case, the control unit 2 sets the transmittance of 9.0% at time T15, 0.15 sec before the trigger at time T13, which is the set time, as the maximum transmittance Max3.

[0080] Moreover, the control unit 2 does not set the transmittance at time T14, which is 0.80 sec before the trigger setting time of time T13, as the minimum transmittance Min3, but determines the minimum transmittance Min1 in the first change range as the minimum transmittance Min3. Then, the control unit 2 periodically changes the transmittance of the transmission image 41c in a change range W4 (second change range) defined between the maximum transmittance Max3 and the minimum transmittance Min3, as shown by a straight line 70 in Fig. 8. Thereafter, when the operation reception unit 4 receives an instruction (operation) to end the constriction operation at time T16, the control unit 2 changes the transmittance of the transmission image 41c from the second change range to the first change range.

[0081] With the above configuration, the programmable display device 1 of the present modified example 2 has the same effects as the programmable display device 1 of the embodiment 1. In addition to the above description, when the transmittance of the transmitted image 41c at the time of the occurrence of the trigger is near the maximum transmittance Max1 in the first change range, the maximum transmittance Max1 may be set as the maximum transmittance Max3 in the second change range, and the minimum transmittance Min3 in the second change range may be determined based on a set time after the trigger.

[0082] [Modification 3] The third modification of the present invention will be specifically described with reference to Fig. 9. Fig. 9 is a diagram showing an example of an operation when the display state of a programmable display device according to the third modification is changed within a first change range and a second change range.

[0083] The present modification 3 is mainly different from the above modification 2 in that the method of determining the maximum transmittance Max4 in the second change range is different from the method of determining the maximum transmittance Max3. In the present modification 3, when the transmittance of the transmitted image 41c at the time of the occurrence of the trigger is, for example, near the minimum transmittance Min1 in the first change range, the control unit 2 sets the minimum transmittance Min1 as the minimum transmittance Min4 in the second change range, like the minimum transmittance Min3 in the modification 2.

[0084] On the other hand, for example, suppose that the trigger for accepting the start operation occurs at time T23 when the transmittance of the transmission image 41c is near the minimum transmittance Min1, as shown by a straight line 80 in Fig. 9. In this case, the control unit 2 determines the maximum transmittance Max4 based on the minimum transmittance Min1 in the first change range and the change range of the transmittance during the constriction operation (for example, the change range of the transmittance that changes between the transmittance at the set time before the trigger and the transmittance at the set time after the trigger).

[0085] Specifically, the control unit 2 adds the minimum transmittance Min1 and the range of change in transmittance during the constriction operation to obtain the maximum transmittance Max4. The range of change in transmittance during the constriction operation is the sum of the transmittance of 16.0% at time T24, 0.80 sec before time T23, which is the set time before the trigger, and the transmittance of 3.0% at time T25, 0.15 sec after time T23, which is the set time after the trigger. Therefore, the maximum transmittance Max4 is the sum of the transmittance of 1.0% which is the minimum transmittance Min1, and the range of change in transmittance of 19.0% during the constriction operation, which is the transmittance of 20.0%.

[0086] Moreover, the control unit 2 does not set the transmittance at time T25 after 0.15 sec, which is the set time after the trigger at time T23, as the minimum transmittance Min4, but determines the minimum transmittance Min1 in the first change range as the minimum transmittance Min4 in the second change range. Then, the control unit 2 periodically changes the transmittance of the transmission image 41c in a change range W5 (second change range) defined between the maximum transmittance Max4 and the minimum transmittance Min4, as shown by a straight line 80 in Fig. 9. Thereafter, when the operation reception unit 4 receives an instruction (operation) to end the constriction operation at time T26, the control unit 2 changes the transmittance of the transmission image 41c from the second change range to the first change range.

[0087] With the above configuration, the programmable display device 1 of the present modified example 3 achieves the same effects as the programmable display device 1 of the embodiment 1. In addition to the above description, when the transmittance of the transmitted image 41c at the time of the occurrence of the trigger is near the maximum transmittance Max1 in the first change range, the maximum transmittance Max1 may be set as the maximum transmittance Max4 in the second change range, and the minimum transmittance Min4 in the second change range may be determined by subtracting the change range of the transmittance during the constriction operation (for example, the change range of the transmittance that changes between the transmittance at the set time before the trigger and the transmittance at the set time after the trigger) from the maximum transmittance Max4.

[0088] Specifically, for example, the range of transmittance change during constriction operation, for example the transmittance of 19.0%, may be subtracted from the maximum transmittance Max4 of 91.0% to obtain a transmittance of 72.0% as the minimum transmittance Min4.

[0089] [Modification 4] Variation 4 of the present invention will be specifically described with reference to Fig. 10. Fig. 10 is a diagram showing a specific display operation in a cleaning mode of a device according to Variation 4. The device according to Variation 4 is a device that does not have a touch panel 4T like the programmable display device 1, and is otherwise configured in the same manner as the programmable display device 1.

[0090] In this modification 4, the control unit 2 mainly differs from the above embodiment 1 in that the control unit 2 maintains the change in the display state in the second change range until the operation reception unit 4 receives the above-mentioned end operation from an operation device other than the touch panel 4T, for example, an operation button provided near the display area 31 or the above-mentioned operation terminal. That is, in this modification 4, the cleaning work period is provided with a cleaning period in which the user cleans the display area 31 and a confirmation period in which the user checks whether the cleaning work of the display area 31 has been properly performed. Furthermore, in this modification 4, the cleaning work period is set so that the confirmation period is included in the cleaning period.

[0091] 10, when the control unit 2 recognizes that the operation receiving unit 4 has received a start operation for starting cleaning of the surface of the display area 31 at time T40, the control unit 2 changes the range in which the display state of the display area 31 changes from the first change range to the second change range. As a result, in this modification 4, the cleaning implementation period of the cleaning work period starts from time T40.

[0092] After that, in this modification 4, even if the user has completed the cleaning work at time T41, the user does not perform the end operation. Therefore, the operation reception unit 4 does not accept the end operation, so the control unit 2 maintains the range in which the display state in the display area 31 changes to the second change range. Then, when the control unit 2 recognizes that the operation reception unit 4 has accepted the end operation at time T42, the control unit 2 determines that the cleaning work and the cleaning confirmation work by the user have been completed. In other words, the control unit 2 determines that the confirmation implementation period of the cleaning work period has ended at time T42. Then, the control unit 2 changes the display state in the display area 31 from the second change range to the first change range. In this way, the control unit 2 sets a confirmation implementation period in which the change in the display state in the second change range is maintained until the operation reception unit 4 accepts the end operation.

[0093] In other words, in this fourth modification, when the cleaning period ends at time T41, for example, a confirmation period is provided from time T41 to time T42 when the end operation is received, as shown in Fig. 10. Then, when the control unit 2 recognizes that the end operation is received at time T42, it changes the range in which the display state in the display area 31 changes from the second change range to the first change range.

[0094] In addition to the above description, the confirmation period may be monitored based on a predetermined time, regardless of whether the end operation is performed. Specifically, the predetermined time for the confirmation period may be set to, for example, 1 sec to 5 sec, and may be included in the second operation information and stored in the storage unit 5. Furthermore, the control unit 2 may return to the cleaning period when it detects a cleaning operation (start operation) again during the confirmation period, and may set the confirmation period again when the cleaning operation is completed. Furthermore, the control unit 2 may change to the first change range when it receives an end operation or after a predetermined time has elapsed.

[0095] With the above configuration, the device of the present modification 4 achieves the same effect as the programmable display device 1 of the embodiment 1. The device of the present modification 4 is also provided with a confirmation implementation period during which the display state changes within the second change range. This allows the user to easily check whether the cleaning target remains on the display area 31 after finishing cleaning, and the cleaning target can be cleaned more reliably. Note that the operation reception unit 4 receiving a start operation or an end operation includes a case where the operation reception unit 4 recognizes that an operation instruction is to be made from an operation button provided near the display area 31 or the above-mentioned operation terminal.

[0096] [Modification 5] Modification 5 of the present invention will be specifically described with reference to Fig. 11 and Fig. 12. Fig. 11 is a diagram showing a specific display operation in a cleaning mode of a programmable display device according to Modification 5. Fig. 12 is a flowchart showing an example of the operation of the programmable display device shown in Fig. 11.

[0097] The present modified example 5 differs from the above modified example 4 mainly in that a cleaning operation period is started by detecting a cleaning action by a user on the touch panel 4T.

[0098] Specifically, as shown in Fig. 11, when the control unit 2 recognizes that the user has performed a predetermined touch operation on the touch panel 4T at time T40, the control unit 2 determines that the operation reception unit 4 has received the above-mentioned start operation from the user. Then, the control unit 2 changes the range in which the display state in the display area 31 changes from the first change range to the second change range. As a result, in this modification 5, the cleaning period starts from time T40. Also, the predetermined touch operation refers to, for example, a case in which the user performs a touch operation on any location in the display area to be cleaned.

[0099] After that, when the control unit 2 recognizes that the user has performed a predetermined touch operation on the touch panel 4T at time T43, the control unit 2 determines that the above-mentioned end operation has been received from the user. Then, the control unit 2 maintains the change in the display state in the second change range for a predetermined period from time T43 to time T44. That is, in this modified example 5, the cleaning implementation period ends at time T43, and a cleaning confirmation period is performed from time T43 to time T44. Then, when the control unit 2 recognizes that time T44 has passed, it changes the display state in the display area 31 from the second change range to the first change range. In this way, the control unit 2 maintains the change in the display state in the second change range for a predetermined period from the timing when the operation reception unit 4 receives the end operation.

[0100] That is, in this modification 5, steps S1 to S3, S5, and S7 in Fig. 12 are the same as steps S1 to S3, S5, and S7 shown in Fig. 3. As shown in step S14 in Fig. 12, in this modification 5, the control unit 2 detects whether or not a predetermined touch operation has been performed by the user on the touch panel 4T, and determines whether or not the operation acceptance unit 4 has accepted a start operation for starting cleaning of the surface of the display area 31 as the operation (step S14). If the control unit 2 determines that the operation acceptance unit 4 has not accepted a start operation (NO in step S14), the control unit 2 returns to step S3.

[0101] On the other hand, if the control unit 2 determines that the above touch operation is detected on the touch panel 4T and the operation receiving unit 4 has received the start operation (YES in step S14), the control unit 2 performs a narrowing operation to change the display state in the display area 31 within a narrow range (step S5).

[0102] Next, the control unit 2 detects whether or not a predetermined touch operation has been performed on the touch panel 4T by the user, and determines whether or not the operation reception unit 4 has received an instruction to end the constriction operation (end operation) (step S16). If the control unit 2 determines that the operation reception unit 4 has not received the end operation (NO in step S16), the control unit 2 goes into a standby state. In the determination of step S16, the control unit 2 may, for example, find that the duration of the standby state has elapsed a predetermined time, and determine that the operation reception unit 4 has received the fact that the touch operation is no longer detected as an end operation.

[0103] On the other hand, if the control unit 2 determines that the operation reception unit 4 has received the end operation by the touch operation no longer being detected by the touch panel 4T (YES in step S16), the control unit 2 determines whether or not a predetermined period (i.e., the confirmation implementation period) has elapsed since the reception timing (step S17). If the control unit 2 determines that the predetermined period has elapsed (YES in step S17), the control unit 2 returns to step S2. That is, the control unit 2 changes the range in which the display state in the display area 31 changes from the second change range to the first change range.

[0104] On the other hand, if the control unit 2 determines that the predetermined period has not elapsed (NO in step S17), the control unit 2 detects whether or not a predetermined touch operation has been performed by the user on the touch panel 4T, and determines whether or not the operation reception unit 4 has received a start operation for starting cleaning of the surface of the display area 31 as an operation (step S18). If the control unit 2 determines that the operation reception unit 4 has not received a start operation (NO in step S18), the control unit 2 returns to step S17. That is, the control unit 2 maintains the confirmation implementation period. In this way, the cleaning implementation period and the confirmation implementation period can be repeated. This makes it possible to easily improve the efficiency of the cleaning work.

[0105] On the other hand, if the control unit 2 determines that the touch operation is detected on the touch panel 4T and the operation reception unit 4 has received the start operation (YES in step S18), the control unit 2 returns to step S16.

[0106] With the above configuration, the programmable display device 1 of the present modified example 5 achieves the same effects as the device of modified example 4. The control unit 2 recognizes that the user's contact with the touch panel 4T to wipe the display area 31 is a start operation, and recognizes that the user's removal of the hand or the like from the touch panel 4T after finishing the wiping operation is an end operation.

[0107] [Modification 6] The sixth modification of the present invention will be specifically described with reference to Fig. 13 and Fig. 14. Fig. 13 is a flowchart showing an example of the operation of the programmable display device according to the sixth modification. Fig. 14 is a diagram showing a specific display operation in the cleaning mode of the programmable display device shown in Fig. 13.

[0108] This variant example 6 differs from the above-mentioned embodiment 1 mainly in that when the operation receiving unit 4 receives an operation to change the form in which the display state of the display area 31 or the above-mentioned operation terminal changes during a narrowing operation (second change range), the control unit 2 changes the display state in that form.

[0109] 13, in the present modified example 6, while performing the constriction operation, the control unit 2 determines whether or not the operation receiving unit 4 has received a change instruction for changing the form of the display state in the display region 31. If the control unit 2 determines that the operation receiving unit 4 has not received a change instruction as an operation (NO in step S11), the control unit 2 goes into a standby state.

[0110] On the other hand, if the control unit 2 determines that the operation reception unit 4 has received a change instruction (YES in step S11), the control unit 2 changes the form of the display state in the constriction motion (step S12).

[0111] Specifically, the control unit 2 displays a diagram showing the change in transmittance as shown in FIG. 14 on a part of the operation screen or on the above-mentioned operation terminal so that the user can perform an operation to change the form of the display state. For example, when the display state in the display area 31 changes in the first change range, as shown by the straight line 90 in FIG. 14, the operation reception unit 4 sets the form of the change in the display state to moving the change region of the transmittance in the direction shown by the arrow Ar1 at time T4 in FIG. 14 or in the direction shown by the arrow Ar2 at time T5. In addition, the operation reception unit 4 receives an instruction to change the movement direction and the movement amount of the change region as an operation by the user. Then, when the operation reception unit 4 receives the above operation, the control unit 2 moves the change region of the transmittance in the direction shown by the arrow Ar1 or the arrow Ar2 while keeping the time (change width) for performing the narrowing operation constant. The above operation includes a swipe operation.

[0112] Also, for example, narrowing the range of change in transmittance as shown by the double-headed arrow Ar3 in Fig. 14 is regarded as a change in the display mode. The operation reception unit 4 receives an instruction to change the display state in the display area 31 to narrow the range of change as an operation by the user. Then, when the operation reception unit 4 receives the above operation, the control unit 2 narrows the range of change in transmittance to the range indicated by the double-headed arrow Ar3. In this way, when the control unit 2 recognizes that it has received an instruction to change the display state mode, it narrows the range of change in transmittance to reduce the value of the maximum transmittance Max2 and increase the value of the minimum transmittance Min2, thereby performing a narrowing operation. An example of the above operation to narrow the range of change is a pinch-in operation.

[0113] Also, for example, the change in the display mode refers to the widening of the range of change in the transmittance, as indicated by the double-headed arrow Ar4 in Fig. 14. The operation reception unit 4 receives an instruction to change the display state in the display area 31 to widen the range of change, as an operation by the user. Then, when the operation reception unit 4 receives the above operation, the control unit 2 widens the range of change in the transmittance to the range indicated by the double-headed arrow Ar4. In this way, when the control unit 2 recognizes that it has received an instruction to change the display state mode, it widens the range of change in the transmittance, thereby increasing the value of the maximum transmittance Max2 and decreasing the value of the minimum transmittance Min2, thereby performing a pinching operation. An example of the above operation to widen the range of change is a pinch-out operation.

[0114] With the above configuration, the programmable display device 1 of the present modified example 6 has the same effect as the programmable display device 1 of the embodiment 1. In addition, in the programmable display device 1 of the present modified example 6, the manner in which the display state changes is variable, so that it is possible to move the area in which the display state changes, or to expand or reduce the range of change in the display state. This makes it easier to check whether there are any cleaning targets remaining on the display area 31 after cleaning. Therefore, the time required for this check can be shortened.

[0115] [Modification 7] A specific description will be given of Modification 7 of the present invention. Modification 7 is mainly different from the above-mentioned embodiment 1 in that the change in the display state is stopped based on the timing when the start operation is accepted, and the transparent image is displayed at the transmittance when the change in the display state is stopped.

[0116] Specifically, in the seventh modified example, when the operation receiving unit 4 receives a start operation for starting cleaning of the surface of the display area in a state in which the display state is changing within a first change range as a specified change range, the control unit 2 stops the state in which the display state is changing within the first change range (specified change range). Furthermore, the control unit 2 displays the transmitted image at the transmittance at which the change in the display state is stopped as the transmittance of the transmitted image. More specifically, the control unit 2 can set the maximum transmittance Max2 and minimum transmittance Min2 of the second change range in the above embodiment to the same values ​​as the transmittance at which the change in the display state is stopped upon receiving the start operation, for example, by setting the pre-trigger set time and the post-trigger set time to times of the same value but different polarity.

[0117] With the above configuration, the programmable display device 1 of the seventh modified example stops the change in the display state from a specified change range based on the timing at which the start operation is received, and displays the transmitted image at the transmittance at which the change in the display state was stopped, making it easier to make the object to be cleaned stand out.

[0118] In addition, in the seventh modification, when a plurality of transparent images are superimposed on the screen 41a and displayed, the control unit 2 may stop the state in which the transmittance of at least one of the transparent images is changed within the first change range as the display state, and then display the at least one transparent image at the transmittance at which the change in the display state was stopped. In this case, the transmittance of at least one of the plurality of transparent images superimposed on the screen 41a is changed, and the at least one transparent image is displayed at the transmittance at which the change in the display state was stopped, while the transmittances of the other transparent images are fixed. This makes it possible to set various transmittances based on the transmittances of the plurality of transparent images.

[0119] In addition, in the seventh modification, when one dark-colored transmitted image and one light-colored transmitted image are displayed on the screen 41a in a superimposed manner as a plurality of transmitted images, the control unit 2 may stop the state in which the transmittance of only one of the transmitted images is changed in the first change range as the display state, and then display the one of the transmitted images at the predetermined transmittance. In this case, the transmittance of only one of the dark-colored transmitted image and the light-colored transmitted image is changed in the first change range, and the transmitted image is displayed at the transmittance when the change in the display state is stopped, and the display state is changed from dark to light or from light to dark in the state in which the screen is transparent. This makes it easier to find the cleaning target.

[0120] Furthermore, when a touch panel 4T is used as the operation reception unit 4, the control unit 2 displays an operation screen that receives operations via the touch panel 4T, for example, as the screen 41a. In this case, the control unit 2 may disable operations on the operation screen via the touch panel 4T when the display state is being changed within the first change range or when the change in the display state is stopped. In this case, operations on the operation screen via the touch panel 4T are disabled when cleaning the cleaning target. This makes it possible to prevent touching the touch panel 4T during cleaning from being recognized as an operation on the operation screen, and to suppress erroneous operations on the touch panel 4T.

[0121] Furthermore, the control unit 2 may display the transparent image at the transmittance when the change in the display state is stopped for a predetermined period from the timing when the operation reception unit 4 receives an end operation for ending cleaning as an operation, or for the period until the end operation is received. In this case, during the above period, after finishing cleaning, it is possible to easily check whether or not the cleaning target remains on the display screen, and the cleaning target can be cleaned more reliably.

[0122] [Embodiment 2] A specific description will now be given of the second embodiment of the present invention. For the sake of convenience, the same reference numerals will be given to members having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0123] The second embodiment differs from the first embodiment mainly in that the control unit 2 changes the display color in the display area 31 as the display state of the display area 31 within a first change range or a second change range.

[0124] Specifically, the control unit 2 sets, as a first change range of the display color, for example, white, black, and, for example, 89 levels of gray between the white and black, and changes the display color sequentially and in a looping manner through a total of 91 levels of gray. The 89 levels of gray range from the first level of gray that is closest to white, to the second level of gray, ..., to the 89th level of gray that is closest to black. Then, when the control unit 2 recognizes that the operation reception unit 4 has received the start operation, the control unit 2 changes the display color sequentially and in a looping manner through, for example, the 37th level of gray to the 56th level of gray, as a second change range of the display color.

[0125] With the above configuration, the programmable display device 1 of the present embodiment 2 has the same effects as the programmable display device 1 of the embodiment 1. Furthermore, in the programmable display device 1 of the present embodiment 2, the control unit 2 changes the display color in the display area 31 within the first change range or the second change range as the display state of the display area 31, making it easier to find the cleaning target.

[0126] In addition to the above description, a color having transparency may be used for the display color. That is, a semi-transparent display color may be superimposed on the screen 41a and changed in the first or second change range. For example, 89 levels of gray with a transmittance of 10% are set as the first change range from white with a transmittance of 10% to black with a transmittance of 10%. That is, as the 89 levels of gray with a transmittance of 10%, a gray closest to white as the first level of gray, a gray closest to black as the second level of gray, ..., and a gray closest to black as the 89th level of gray are set. Then, by changing the display color without changing the transmittance of 10%, the display color in the display area 31 may be changed in the first change range as the display state in the display area 31, and as the second change range, the display color may be changed sequentially and in a loop between 37 levels of gray with a transmittance of 10% and 56 levels of gray.

[0127] In addition to the above description, the first change range may be defined by setting the display of colors such as white, blue, and black, or white, red, and black to a total of 91 stages as described above (that is, by gradually changing from white to blue and from blue to black, or by gradually changing from white to red and from red to black). Furthermore, the first change range may be set to include not only single colors such as these, but also intermediate colors of colors that change gradually, such as color gradations.

[0128] Also, similar to the above-mentioned variant example 6, when the operation receiving unit 4 receives an operation to change the manner in which the display color (display state) changes in the display area 31 or the above-mentioned operation terminal, the control unit 2 may be configured to move the change range of the display color (change the chromaticity value) or change the change range of the display color (change the range of the chromaticity value).

[0129] In addition to the above description, the change in display color in the first change range may be, for example, by changing the display colors shown by 91 color bars (not shown) sequentially and in a loop, and then changing, for example, 20 color bars out of the color bars sequentially and in a loop as the second change range.

[0130] In addition to the above description, the display state may be such that the display color is a predetermined color and the luminance value is changed within a first change range or a second change range.

[0131] [Software implementation example] The control block of the programmable display device 1 (particularly, the control unit 2) may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software.

[0132] In the latter case, the programmable display device 1 includes a computer that executes instructions of a program, which is software that realizes each function. The computer includes, for example, one or more processors, and also includes a computer-readable recording medium that stores the program.

[0133] The object of the present invention is achieved by causing the processor in the computer to read the program from the recording medium and execute the program. The processor may be, for example, a CPU.

[0134] The recording medium may be a "non-transitory tangible medium", such as a ROM, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, etc. Furthermore, the programmable display device 1 may also include a main memory for loading the programs.

[0135] The program may be supplied to the computer via any transmission medium capable of transmitting the program (such as a communication network or a broadcast wave). One aspect of the present invention may also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

[0136] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0137] Specifically, as a display state, for example, the transmittance shown in embodiment 1 and the display color shown in embodiment 2 may be changed simultaneously within a first change range or a second change range to change multiple display states. [Explanation of symbols]

[0138] 1 Programmable display (display device) 2. Control section 3 Display section 31 Display area 4 Operation reception section 4T Touch Panel 41a screen W1 Change range (first change range) W2~W5 change range (second change range)

Claims

1. an operation receiving unit that receives an operation by a user; A display unit having a display area; a control unit that changes the display state based on predetermined operation information related to the display state in the display area, The control unit is A screen including specified display information is displayed in the display area, and a transparent image is displayed so as to be superimposed on the screen; during a cleaning preparation period, a transmittance value of the transmission image is changed within a first change range defined by a minimum value and a maximum value as the display state based on the operation information; a display device characterized in that, while the transmittance value is changing within the first change range, during a cleaning operation period that is set based on the timing when the operation receiving unit receives a start operation to start cleaning the surface of the display area as the operation, the transmittance value is changed within the first change range within a second change range that is narrower than the first change range based on the operation information.

2. An operation reception unit that receives operations by a user; A display unit having a display area; a control unit that changes the display state based on predetermined operation information related to the display state in the display area, The control unit is During a cleaning preparation period, a display color is changed as the display state within a first change range in which a color changes in a predetermined number of steps between a first color and a second color based on the operation information, and a display device characterized in that, while the display color is changing within the first change range, during a cleaning operation period that is set based on the timing when the operation receiving unit receives a start operation to start cleaning the surface of the display area as the operation, the display color is changed within the first change range within a second change range that is narrower than the first change range based on the operation information.

3. 2. The display device according to claim 1, wherein the control unit causes a plurality of the transmissive images to be superimposed on the screen and changes a transmittance of at least one of the transmissive images within the first change range or the second change range as the display state.

4. 4. The display device according to claim 3, wherein the control unit causes one dark-colored transmitted image and one light-colored transmitted image to be superimposed on the screen as the plurality of transmitted images, and changes the transmittance of only one of the transmitted images within the first change range or the second change range.

5. the operation reception unit includes a touch panel, The display device according to claim 1, 3 or 4, characterized in that the control unit displays an operation screen that accepts operations via the touch panel as the screen, and disables operation of the operation screen via the touch panel when the display state is changed within the first change range or the second change range.

6. The display device according to any one of claims 1 to 5, characterized in that the control unit maintains the change in the display state in the second change range for a predetermined period from the timing when the operation receiving unit receives an end operation to end cleaning as the operation, or for a period until the end operation is received.

7. The display device according to any one of claims 1 to 6, characterized in that when the operation receiving unit receives an operation to change the form in which the display state changes within the second change range as the operation, the control unit changes the display state in the form.

8. an operation receiving unit that receives an operation by a user; A display unit having a display area; a control unit that changes the display state based on predetermined operation information related to the display state in the display area, the control unit, during a cleaning preparation period, causes the display area to display a screen including specified display information based on the operation information, and causes a transmission image to be displayed so as to be superimposed on the screen, and changes a value of a transmittance of the transmission image within a change range defined by a minimum value and a maximum value as the display state; a display device which, while the transmittance value is changing within the change range, stops the change in the transmittance value during a cleaning operation period which is set based on a timing at which the operation receiving unit receives a start operation for starting cleaning of the surface of the display area as the operation, and displays the transmitted image at the transmittance value at the time when the change in the transmittance value was stopped.

9. 9. The display device according to claim 8, wherein the control unit causes a plurality of the transparent images to be superimposed on the screen and changes a transmittance of at least one of the transparent images within the change range as the display state, and displays the transparent image at the transmittance at which the change of the display state is stopped.

10. 10. The display device according to claim 9, wherein the control unit causes one dark-colored transparent image and one light-colored transparent image to be superimposed on the screen as the plurality of transparent images, changes a transmittance of only one of the transparent images within the change range, and displays the transparent image at the transmittance at which the change in the display state was stopped.

11. the operation reception unit includes a touch panel, The display device according to any one of claims 8 to 10, characterized in that the control unit displays an operation screen that accepts operations via the touch panel as the screen, and disables operation of the operation screen via the touch panel when the display state is changing within the change range or when the change of the display state is stopped.

12. 12. The display device according to claim 8, wherein the control unit displays the transmissive image at the transmittance at which the change in the display state was stopped for a predetermined period from when the operation accepting unit accepts an end operation for ending cleaning as the operation, or for a period until the end operation is accepted.

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