DISPLAY DEVICE

Abstract

A display device comprises a display unit and a display control unit that controls images displayed on the display unit. When one of a plurality of modes, each with different ways of displaying measurement results, is selected using a mode button displayed on the display unit, the display control unit displays a measurement result on the display unit in a mode corresponding to the selected mode. The plurality of modes includes at least (i) a dial mode, which displays an image of a scale and a pointer superimposed on it to indicate a value specified by the pointer, and (ii) a numeric mode, which displays at least one measurement value, the maximum measurement value within a given period, and the minimum measurement value within the given period.

Description

display device

[0001] The present invention relates to image display technology, and more particularly to image display technology in measuring instruments.

[0002] Measuring instruments such as dial gauges have physically displaceable sensor elements called spindles or levers. Dial gauges indicate the amount of displacement of the sensor elements with a pointer. Patent Document 1 discloses a measuring instrument that can display the amount of displacement of the spindle as an image.

[0003] JP 2013-185990 A JP 8-61907 A

[0004] When showing the measurement results as a digital image, it is desirable to display the measurement values ​​using an appropriate display method depending on the purpose of the measurement. Also, in the case of lever gauges, due to the characteristics of their structure, there are ranges where the measurement accuracy is relatively high and ranges where it is low, so it is desirable to measure the displacement of the lever gauge within the range where the measurement accuracy is high.

[0005] A display device according to one aspect of the present invention includes a display unit and a display control unit that controls an image displayed on the display unit. When a mode is selected from a plurality of modes that differ in the manner of displaying measurement results using a mode button displayed on the display unit, the display control unit causes the display unit to display a display corresponding to the selected mode. The plurality of modes include at least: (i) a dial mode that displays an image of a scale with a pointer superimposed thereon, and displays the value indicated by the pointer; and (ii) a numeric mode that displays at least the measurement value, the maximum measurement value within a predetermined period, and the minimum measurement value within the predetermined period.

[0006] In another aspect of the present invention, a display device includes a display unit that displays a displacement amount of a variable lever as a measurement value, and a display control unit that controls an image displayed on the display unit. The lever has an effective measurement range set as a predetermined measurement range that is a position different from the initial position and that includes a reference position corresponding to a reference displacement amount. The display control unit displays an indicator that indicates the effective measurement range and indicates whether the current displacement amount of the lever is within the effective measurement range.

[0007] According to the present invention, it is easy to improve the visibility of the measurement results.

[0008] 2(a) is a perspective view of a lever gauge. FIG. 2(a) is a top view of a display device. FIG. 2(b) is a front view of the display device. FIG. 2(c) is a side view of the display device. FIG. 2(c) is a perspective view of a display device. FIG. 2(a) is a schematic diagram showing a method for measuring a circular structure using a lever gauge. FIG. 2(c) is a functional block diagram of a display device. FIG. 2(a) is a first screen view of a dial mode screen. FIG. 2(b) is a second screen view of the dial mode screen. FIG. 2(c) is a screen view of a bar mode screen. FIG. 2(c) is a screen view of a numeric mode screen. FIG. 2(c) is a screen view of a chart mode screen. FIG. 2(c) is a screen view of a circle measurement mode screen. FIG. 2(c) is a schematic diagram for explaining the movable range of a lever in a lever gauge. FIG. 2(a) is a diagram showing an example of the display of an indicator when searching for a reference position.

[0009] FIG. 1 is a perspective view of a lever gauge 200. The lever gauge 200 includes a main body 206, a connection terminal 204, and a lever 202 that is configured to be displaceable. The lever 202 is displaceable in the vertical direction as indicated by the arrow in FIG. 1. The lever gauge 200 is a measuring instrument that measures the physical displacement of the lever 202. The lever gauge 200 is connected to a display device 100 (described below) via the connection terminal 204. The lever gauge 200 generates an electrical signal (hereinafter referred to as a "displacement signal") that indicates the displacement of the lever 202, and transmits the electrical signal from the connection terminal 204 to the display device 100.

[0010] Fig. 2(a) is a top view of the display device 100, Fig. 2(b) is a front view of the display device 100, and Fig. 2(c) is a side view of the display device 100. Fig. 3 is a perspective view of the display device 100. The following description will be given with X, Y, and Z axes set as shown in Figs. 2(a) to 2(c) and 3. The Z axis direction is the vertical direction, and the X and Y directions are the horizontal directions.

[0011] The display device 100 is equipped with a monitor 102 that is a full-color LCD (Liquid Crystal Display). Measurement values ​​received as displacement signals from the lever gauge 200 are displayed on the monitor 102. The monitor 102 corresponds to the display unit 110 in FIG. 5. A touch panel is also provided on the surface of the monitor 102, allowing the user to operate the display device 100 via the touch panel. This touch panel corresponds to the input unit 112 in FIG. 5.

[0012] 2(b), a USB (Universal Serial Bus) terminal 108 is formed on the top side (first side) of the display device 100. The display device 100 is connected to the lever gauge 200 via a cable via the USB terminal 108. A secondary battery (not shown) is stored in the back portion 106.

[0013] The display device 100 can communicate with external devices via Bluetooth (registered trademark). The display device 100 also includes a slot for inserting a microSD card. The display device 100 can also store measurement values ​​on the microSD card. Firmware updates are also possible via the microSD card. The body of the display device 100 is made of resin. The back 106 has a built-in iron plate, so the back 106 can also be attached to a magnet.

[0014] FIG. 4 is a schematic diagram showing a method for measuring a circular structure 210 using a lever gauge 200. The circular structure 210 is a workpiece to be measured and has a cylindrical shape. In FIG. 4, the "roundness" of the circular structure 210, more specifically, the difference between the circular structure 210 and a perfect circle, is measured using the lever gauge 200. First, the lever gauge 200 is fixed with the lever 202 of the lever gauge 200 pressed against the surface of the circular structure 150. The lever gauge 200 is connected to the display device 100. The circular structure 150 is placed on a rotary table 212. The rotary table 212 rotates at a constant rotational speed, causing the circular structure 150 to rotate about its axis.

[0015] If the outer periphery of the circular structure 210 is a perfect circle, the lever 202 will not move from its initial setting position. However, since the surface of the circular structure 210 usually has slight distortions or irregularities, the lever 202 will be slightly displaced during rotation. The circularity of the circular structure 210 is measured based on the displacement history of the lever 202 at this time, as will be described in detail later.

[0016] FIG. 5 is a functional block diagram of the display device 100. The components of the display device 100 are implemented by hardware including computing units such as a CPU (Central Processing Unit) and various coprocessors, storage devices such as memory and storage, and wired or wireless communication lines connecting these, as well as software stored in the storage devices and supplying processing instructions to the computing units. The computer program may be configured by a device driver, an operating system, various application programs located at higher layers than these, and libraries that provide common functions to these programs. Each block described below represents a functional block, not a hardware configuration.

[0017] The display device 100 includes a user interface processing unit 114, a data processing unit 116, a communication unit 118, and a data storage unit 120. The user interface processing unit 114 accepts operations from the user and is responsible for user interface-related processing such as image display and audio output. The communication unit 118 is responsible for communication with external devices via Bluetooth (registered trademark) or the like. The data processing unit 116 executes various processes based on data acquired by the user interface processing unit 114 and the communication unit 118 and data stored in the data storage unit 120. The data processing unit 116 also functions as an interface between the user interface processing unit 114, the communication unit 118, and the data storage unit 120. The data storage unit 120 stores various programs and setting data.

[0018] The user interface processing unit 114 includes an input unit 112 and an output unit 122. The input unit 112 accepts input from the user via a touch panel on the monitor 102. The output unit 122 includes a display unit 110. The display unit 110 displays various images.

[0019] The data processing unit 116 includes a measurement unit 124 and a display control unit 126. The measurement unit 124 converts the displacement signal received from the lever gauge 200 into a measurement value. The display control unit 126 generates an image and causes the display unit 110 to display it.

[0020] 6 is a first screen view of the dial mode screen 130. In the initial state, the display control unit 126 displays the dial mode screen 130 on the monitor 102. The dial mode screen 130 includes an upper area 132, a measurement area 134, and a lower area 136. The measurement area 134 displays the displacement of the lever 202 as a measurement value using an image of a meter 500 with a scale set thereon and an image of a pointer 162 displayed above it. The upper area 132 and the lower area 136 are icon areas 138 for checking the status and operating the display device 100. The meter 500 includes a scale that indicates the vertical displacement of the lever.

[0021] As shown in Figure 6, the dial mode screen 130 is configured as a rectangular image area with its longitudinal direction in the Z-axis direction. The upper area 132 extends in the X-axis direction, and multiple icons (an expand button 140, a battery icon 142, a rotate button 144, a communication status icon 146, and a menu button 148) are arranged along the X-axis direction. Some of the icons function as "operation buttons." The lower area 136 also extends in the X-axis direction, and multiple icons (a save button 150, a hold button 152, a start button 154, and a reset button 156) are arranged along the X-axis direction.

[0022] In this embodiment, the measurement area 134 is formed as a substantially square display area. The display control unit 126 visually indicates the displacement of the lever 202 from an initial setting position (described later) using the pointer 162. For example, if the initial setting position is a point where the displacement of the lever 202 is KX, when the displacement of the lever 202 is KX, the pointer 162 is displayed at a position corresponding to "0", which is the center of the meter 500. When the displacement of the lever 202 is greater than KX, the pointer 162 is displayed to the right of the center, and when the displacement is less than KX, the pointer 162 is displayed to the left of the center. In FIG. 6, the pointer 162 is displayed to the left of the center, so the displacement of the lever 202 is smaller than the initial setting position KX.

[0023] An "effective measurement range" is set on the lever 202 as the range within which measurement accuracy can be guaranteed. The measurement range meter 158 indicates the units of the pointer 162, which indicates the distance from the initial setting position (described below). With the lever 202 of the lever gauge 200 pressed against the circular structure 210, the user can check the change in the measurement value from the initial setting position while rotating the circular structure 210 around its axis. The PP range meter 160 indicates the range of minimum and maximum values ​​in the measurement value change history. The measurement value display area 164 numerically indicates the current measurement value, i.e., the amount of displacement from the initial setting position. The range (scale) of the meter 500 can be changed by touching the range button 166.

[0024] When the expansion button 140 in the upper area 132 is touched, the display control unit 126 displays the expansion area 220 (described below). The battery icon 142 displays the remaining battery power. When the rotation button 144 is touched, the display control unit 126 changes the display orientation of the screen. The communication status icon 146 indicates the Bluetooth (registered trademark) connection status. When the menu button 148 is touched, a menu screen (not shown) is displayed.

[0025] When the save button 150 in the lower area 136 is touched, various data such as measurement values ​​and setting values ​​are saved. The hold button 152 is a toggle button, and when set to the hold state, updating of measurement values ​​is stopped. The lever gauge 200 transmits a displacement signal to the display device 100 at regular time intervals, and the display control unit 126 updates the screen each time a new measurement value is obtained. When the start button 154 is selected, the maximum and minimum measurement values ​​are displayed in real time. The reset button 156 is an operation button for resetting the measurement values.

[0026] The dial mode screen 130 also displays an indicator 230. The indicator 230 visually indicates whether the lever 202 is within the valid measurement range and how close it is to the reference position. The indicator 230 will be described in detail with reference to Figure 13 and subsequent figures.

[0027] FIG. 7 is a second screen view of the dial mode screen 130. When the expansion button 140 on the dial mode screen 130 is touched, the display control unit 126 displays the expansion area 220. As shown in FIG. 7, the expansion area 220 is displayed so as to overlap the measurement area 134, in other words, so as not to overlap the icon area 138. Therefore, operability in the icon area 138 is maintained even while the expansion area is displayed. The expansion area 220 includes seven icons (a mode button 222, a device information button 224, a card button 226, a lock button 228, a measurement unit button 232, a measurement display button 234, and a comparison button 236). The mode button 222 is an operation button for switching modes, which are the display methods for measurement values. Modes other than the dial mode will be described with reference to FIG. 8 and subsequent figures. The mode can be switched each time the mode button 222 is touched. More specifically, each time the mode button 222 is touched, the icon on the mode button 222 changes, and the display mode in the measurement area 134 also changes.

[0028] The device information button 224 displays setting information for the display device 100. The card button 226 is a button for removing the micro SD card. The lock button 228 is a button for locking the screen. When the screen is locked, the start button 154 and the reset button 156 are disabled.

[0029] The measurement unit button 232 changes the measurement unit. The measurement display button 234 switches the measurement value to be displayed. Specifically, the measurement value is displayed as "REAL" which displays the real-time measurement value, "MAX" which displays the maximum value during the measurement period, "MIN" which displays the minimum value during the measurement period, or "PP" which indicates the range between the maximum and minimum values. The comparison button 236 selects one of multiple preset allowable ranges. The allowable range indicates the range that is acceptable for the measurement value.

[0030] The expansion area 220 may be displayed at a position or size that overlaps with the measurement area 134 and the icon area 138. Alternatively, when the expansion button 140 on the dial mode screen 130 is touched, the display control unit 126 may expand the measurement area 134 and additionally display the seven icons included in the expansion area 220 in the expanded measurement area 134.

[0031] When the expansion button 140 is touched, the expansion area 220 including the mode button 222 and the like is displayed as described above. If the dial mode is selected here and then the expansion button 140 is touched again, the display control unit 126 hides the expansion area 220 including the mode button 222 and the like.

[0032] FIG. 8 is a screen diagram of the bar mode screen 240. When the user selects "bar mode" using the mode button 222, the display control unit 126 displays the bar mode screen 240. When the user touches the mode button 222 once while in the dial mode (see FIG. 7), the display control unit 126 changes from the dial mode to the bar mode. The mode is cycled through the following modes: dial mode, bar mode, numeric mode, chart mode, and simple circle measurement mode. The bar mode screen 240 includes a current value bar 242 and a PP value bar 244. The PP value bar 244 indicates the amount of displacement from the reference position K1 as a bar chart. When the amount of displacement falls outside the allowable range, the display control unit 126 changes the bar's color from a normal color such as green to a specific color such as red, thereby notifying the user that an "unacceptable amount of displacement has occurred."

[0033] The PP value bar 244 indicates the range of change in the measurement value over a predetermined measurement period, for example, from the start of measurement to the present time. When the range of change falls outside the allowable range, the display control unit 126 warns the user by changing the color of the bar from a normal color such as orange to a specific color such as red.

[0034] When the expand button 140 is touched, the expand area 220 is displayed. When the expand button 140 is touched while in dial mode, a mode button 222 indicating that the mode is dial mode is displayed in the expand area 220. When the mode button 222 is touched here, the mode is changed from dial mode to bar mode. The mode button 222 indicating that the mode is bar mode is also displayed. After changing to bar mode, when the user touches the expand button 140, the expand area 220 is hidden and a bar mode screen 240 shown in FIG. 8 is displayed.

[0035] When the expansion button 140 is touched while in bar mode, a mode button 222 indicating that the mode is bar mode is displayed in the expansion area 220. Touching the mode button 222 here changes from bar mode to numeric mode. The mode button 222 indicating that the mode is numeric mode is also displayed. After changing to numeric mode, when the user touches the expansion button 140, the expansion area 220 is hidden and a numeric mode screen 250 shown in the following Figure 9 is displayed. The method for switching from numeric mode onwards is similar.

[0036] FIG. 9 is a screen diagram of the numeric mode screen 250. When the user selects "Numeric Mode" using the mode button 222, the display control unit 126 displays the numeric mode screen 250. The numeric mode screen 250 includes a REAL numeric area 252, a MAX numeric area 254, a MIN numeric area 256, and a PP numeric area 258. The REAL numeric area 252 displays the most recent measurement value. Since the lever gauge 200 typically transmits displacement signals corresponding to the most recent measurement values ​​at high frequency, the measurement value displayed in the REAL numeric area 252 is also updated frequently. The MAX numeric area 254 indicates the maximum measurement value during the measurement period. The MIN numeric area 256 indicates the minimum measurement value during the measurement period. The PP numeric area 258 indicates the range between the maximum and minimum measurement values ​​during the measurement period. The display control unit 126 displays the four measurement values ​​using white numeric values. When the measurement value falls outside the allowable range, the display control unit 126 changes the display color of the measurement value from white to red. In this way, in the numerical mode, a plurality of numerical values ​​indicating the measurement results in a plurality of formats are displayed side by side in a list.

[0037] 10 is a screen diagram of the chart mode screen 260. When the user selects "chart mode" using the mode button 222, the display control unit 126 displays the chart mode screen 260. The chart mode screen 260 includes a chart area 262. The horizontal axis of the chart area 262 indicates time, and the vertical axis indicates the measurement value (real value). The chart area 262 shows the change in the measurement value over time during the measurement period. The display control unit 126 also indicates the allowable range with a dotted line 264.

[0038] FIG. 11 is a screen diagram of a circle measurement mode screen 270. When the user selects "circle measurement mode" using the mode button 222, the display control unit 126 displays the circle measurement mode screen 270. The circle measurement mode screen 270 includes a circle measurement area 278. In the circle measurement mode, the difference between the circular structure 210 and a true circle is measured by measuring the change in the outer diameter of the circular structure 210 when the circular structure 210 is rotated. For example, assume that the turntable 212 rotates the circular structure 210 once every 60 seconds. In this case, the rotation angle per second of the circular structure 210, i.e., the angular velocity, is 6 (degrees / second).

[0039] If the lever gauge 200 can measure 10 times per second, the display device 100 will acquire a measurement value every time the circular structure 210 rotates 0.6 degrees. The display control unit 126 plots the measurement values ​​acquired every 0.6 degrees of rotation in the circular measurement area 278, thereby obtaining a measurement circle 274. The measurement circle 274 is a combination of the measurement values ​​at each measurement point on the circular structure 210. The widths of the minimum circle 276 and the maximum circle 272 correspond to the tolerance range.

[0040] FIG. 12 is a schematic diagram for explaining the movable range of the lever 202 in the lever gauge 200. In the initial state, the extension direction of the lever 202 coincides with the extension direction of the lever gauge 200 (see FIG. 1). The initial position of the lever 202 at this time is designated "K0." The lever 202 can be displaced up and down around the initial position K0. The maximum displacement position of the lever 202 in the upward direction (second direction) is designated "KP," and the maximum displacement position of the lever 202 in the downward direction (first direction) is designated "KQ." In other words, the lever 202 can be displaced within the range of KP-KQ (hereinafter referred to as the "movable range").

[0041] Within the movable range, there are ranges that can be measured with relatively high accuracy, and there are also ranges with relatively low accuracy. Typically, in the upward direction, the lever gauge 200 has a section KA-KB as an effective measurement range where measurement accuracy can be guaranteed between the initial position K0 and the maximum displacement position KP. The center of the section KA-KB is set as the reference position K1. In the downward direction, there is also a section KC-KD as an effective measurement range where measurement accuracy can be guaranteed between the initial position K0 and the maximum displacement position KQ. The center of the section KC-KD is set as the reference position K2. The user sets any displacement position within the effective measurement range as the initial setting position. In this embodiment, the description will be given assuming that the reference position K1 or K2 is set as the initial setting position.

[0042] When the lever 202 is displaced upward from the reference position K1 (above the initial position K0), a certain level of measurement accuracy can be guaranteed up to the upper limit position KA. Furthermore, when the lever 202 is displaced downward from the reference position K1, a certain level of measurement accuracy can be guaranteed up to the lower limit position KB. The effective measurement range, which is the range in which a certain level of measurement accuracy can be guaranteed, includes the reference position K1 and is bounded by the upper limit position KA and the lower limit position KB. Similarly, the effective measurement range including the reference position K2 is bounded by the upper limit position KC and the lower limit position KD. Thus, the lever gauge 200 has two effective measurement ranges, one in the downward direction (second direction) and one in the upward direction (first direction) from the initial position K0.

[0043] The effective measurement range is determined by the structure of the lever gauge 200, but it is difficult for users to determine the effective measurement range, particularly the reference positions K1 and K2. Typically, a user fixes the lever gauge 200 while pressing the lever 202 against the workpiece so that it is slightly displaced from the initial position K0, and this position is designated the "initial setting position." Then, as illustrated in FIG. 4 , the user measures the workpiece surface while moving the workpiece. High measurement accuracy can be expected if the initial setting position, slightly displaced from the initial position K0, is within the effective measurement range. Typically, users often determine the initial setting position by searching for the effective measurement range, particularly the reference positions K1 and K2, based on the sensation transmitted to their hands when pressing the lever 202 against the workpiece. However, such a method of locating the initial setting position can be very difficult for inexperienced users. The following description assumes that the reference position K1 or K2 is the initial setting position.

[0044] 13 is a diagram showing an example of how the indicator 230 is displayed when searching for the reference position. The indicator 230 includes nine boxes 280, from box 280a to box 280i (see FIG. 6). The central box 280e corresponds to the reference position. When the user displaces the lever 202 upward, the central box 280e corresponds to the reference position K1, box 280b corresponds to the upper limit position KA, and box 280h corresponds to the lower limit position KB. Therefore, boxes 280b to 280h correspond to the effective measurement range above the initial position K0.

[0045] The display control unit 126 illuminates the box 280 corresponding to the position of the lever 202, among the nine boxes 280 included in the indicator 230. In FIG. 13, box 280d, which is one box to the left of box 280e, is illuminated. By checking the indicator 230, the user can visually recognize that the current displacement of the lever 202 is slightly above the reference position K1. When determining the initial setting position of the lever 202, the user can set the lever to the initial setting position near the reference position K1 by adjusting the displacement of the lever 202 so that box 280e in the indicator 230 is illuminated. Note that the initial setting position does not need to coincide with the reference position K1; it is sufficient that the initial setting position is set at least within the effective measurement range. As described above, the displacement of the lever 202 from the initial setting position is the object of measurement.

[0046] On the other hand, when the user displaces the lever 202 downward, the central box 280e corresponds to the reference position K2, box 280b corresponds to the upper limit position KC, and box 280h corresponds to the lower limit position KD. Therefore, boxes 280b to 280h correspond to the lower effective measurement range. Even when using the lower effective measurement range, the user can adjust the displacement of the lever 202 so that box 280e lights up, and then determine the initial setting position of the lever gauge 200.

[0047] <Summary> The lever gauge 200 and the display device 100 have been described above based on the embodiment. The display device 100 can display measurement values ​​in a variety of modes depending on the purpose of measurement. For example, when a user wants to check the measurement value numerically, the numeric mode screen 250 can be displayed, and when a user wants to intuitively grasp the displacement amount of the lever 202, the dial mode screen 130 can be displayed. Furthermore, in this embodiment, the roundness of the circular structure 210 can be easily measured. Generally, when measuring the outer diameter of the circular structure 210, the rotation angle of the circular structure 210 at the time of measurement is often obtained using an encoder, and the measurement value and the rotation angle are recorded in association with each other. In this embodiment, the circular structure 210 is rotated at a constant speed, and the rotation angle at the time of measurement can be determined from the time elapsed since the start of measurement.

[0048] The display device 100 of this embodiment allows a user to visually confirm the reference position of the lever gauge 200. Even a user who is not accustomed to the feel of the lever gauge 200 can easily measure a workpiece appropriately using the lever gauge 200.

[0049] The present invention is not limited to the above-described embodiments and modifications, and the components can be modified without departing from the spirit of the invention. Various inventions can be formed by appropriately combining multiple components disclosed in the above-described embodiments and modifications. Furthermore, some components can be omitted from all the components shown in the above-described embodiments and modifications.

[0050] <Modifications> In the present embodiment, the lever gauge 200 is connected to the display device 100. Alternatively, the display device 100 may be connected to other types of measuring instruments such as an indicator gauge.

[0051] This patent application claims priority from Japanese Patent Application No. 2022-143589 (filed September 9, 2022), the entire contents of which are incorporated herein by reference.

Claims

1. A display device comprising: a display unit; and a display control unit that controls an image displayed on the display unit, wherein when one of a plurality of modes that differ in the way measurement results are displayed is selected by a mode button displayed on the display unit, the display control unit causes the display unit to display a display corresponding to the selected mode, and the plurality of modes include at least: (i) a dial mode that displays a pointer superimposed on an image of a scale and displays the value indicated by the pointer, and (ii) a numeric mode that displays at least the measurement value, the maximum measurement value within a specified period, and the minimum measurement value within the specified period.

2. The display device according to claim 1, wherein the display control unit, in the dial mode, changes the range of the scale displayed on the display unit based on a range change instruction from the user, and the display control unit, in the dial mode, causes the display unit to display the range of movement of the pointer so that it can be seen.

3. The display device according to claim 1, wherein the plurality of modes further includes a circle measurement mode that displays the results of measuring the perimeter of a circular structure.

4. The display device according to claim 1, wherein the plurality of modes further includes a chart mode that shows a history of changes in measurement values.

5. The display device according to claim 1, wherein the plurality of modes further includes a bar mode that displays both or either of the measurement value and the range of change of the measurement value as a bar graph.

6. The display device according to claim 1, wherein the display unit comprises a first area for displaying a display corresponding to the mode and a second area for displaying an icon for operation, and the display control unit (i) displays the mode button on the display unit when the icon is selected, and (ii) after displaying the mode button, selects the dial mode and then removes the mode button from the display unit when the icon is selected.

Images