Terminal device

Abstract

To provide new technology with which it is possible to improve convenience when showing information on a display.SOLUTION: A terminal device 10 comprises: an illuminance acquisition unit 110 that acquires the detection value of illuminance external to the terminal device 10; a position acquisition unit 120 that acquires position data that indicates the position of the terminal device 10; a map storage unit 130 that stores map data in which the position of a prescribed facility is indicated; and a display control unit 140 that switches the manner of showing information on a display 220 between a first display mode and a second display mode, on the basis of whether or not the state of the detection value being continuously greater than or equal to a prescribed illuminance threshold or the state of the detection value being continuously less than the illuminance threshold continues for a prescribed time threshold or more. The display control unit 140 uses a value, as the time threshold, that corresponds to whether or not the position indicated by the position data is near the prescribed facility.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This invention relates to a terminal device. [Background technology]

[0002] A technology is known that improves user convenience by switching the display method depending on whether the environment in which the information is displayed is bright or dark when displaying information on a screen.

[0003] For example, Patent Document 1 discloses a vehicle display device comprising estimation means for estimating the need for dimming based on map data and the vehicle's position, and display mode changing means for changing the display mode of a display unit mounted on the vehicle based on the estimated need for dimming. Patent Document 2 also discloses a navigation device comprising driving environment determination means for determining whether the area around the vehicle is a dark driving environment based on the vehicle's position and map information, illumination detection means for detecting the illumination around the vehicle, and display control means for switching between a day screen display mode and a night screen display mode based on the determination result by the driving environment determination means and the illumination. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-250472 [Patent Document 2] Japanese Patent Publication No. 2009-265061 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] As evidenced by the various technologies being proposed, there is a high demand for technologies that allow for switching displays according to the brightness of the environment in which the display is performed, and there is a need for the provision of even more novel technologies.

[0006] Accordingly, an object of the present invention is to provide a novel technique capable of improving convenience when displaying information on a display. [Means for Solving the Problem]

[0007] A terminal device according to a first aspect is a terminal device comprising a display, an illuminance acquisition unit that acquires a detection value of illuminance outside the terminal device; a position acquisition unit that acquires position data indicating a position of the terminal device; a map storage unit that stores map data indicating positions of predetermined facilities; a display control unit that switches whether information is displayed on the display in a first display mode or a second display mode, based on whether a state where the detection value continuously remains equal to or greater than a predetermined illuminance threshold or a state where the detection value continuously remains less than the illuminance threshold continues for a predetermined time threshold or more, wherein the first display mode and the second display mode are modes in which screen brightness of the display when displaying the information is different from each other, the display control unit uses, as the time threshold, a value corresponding to whether or not the position indicated by the position data is in the vicinity of the predetermined facility. [Effect of the Invention]

[0008] According to the present invention, a novel technique capable of improving convenience when displaying information on a display can be provided. [Brief Description of the Drawings]

[0009] [Figure 1] FIG. 1 is a block diagram showing an example of a hardware configuration of a terminal device according to an embodiment. [Figure 2] FIG. 2 is a block diagram showing an example of a functional configuration of the terminal device according to Embodiment 1. [Figure 3]This flowchart shows an example of the flow of the operation for determining the display mode by the terminal device according to Embodiment 1. [Figure 4] This is a block diagram showing an example of the functional configuration of a terminal device according to Embodiment 2. [Figure 5] This flowchart shows an example of the flow of the operation for determining the display mode by the terminal device according to Embodiment 2. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings. For clarity of explanation, the following descriptions and drawings have been omitted and simplified as appropriate. Furthermore, in each drawing, the same elements are denoted by the same reference numerals, and redundant explanations have been omitted where necessary.

[0011] <Embodiment 1> Figure 1 is a block diagram showing an example of the hardware configuration of the terminal device 10 according to Embodiment 1. Figure 2 is a block diagram showing an example of the functional configuration of the terminal device 10 according to Embodiment 1. In this embodiment, the terminal device 10 is, for example, an in-vehicle device equipped with the function of a navigation system, but the terminal device 10 is not limited to an in-vehicle device. For example, the terminal device 10 may be a portable terminal such as a smartphone or tablet. Also, the terminal device 10 does not necessarily have the function of a navigation system.

[0012] First, the hardware configuration of the terminal device 10 will be described with reference to Figure 1. As shown in Figure 1, the terminal device 10 includes a control device 100, an optical sensor 200, a GNSS (Global Navigation Satellite System) antenna 210, and a display 220.

[0013] The control device 100 is a device that controls the operation of the terminal device 10, and includes a processor 101 and a memory 102.

[0014] Memory 102 is composed of, for example, a combination of volatile memory and non-volatile memory. Memory 102 is used to store programs executed by the processor 101 and data used for various processes of the terminal device 10. The map storage unit 130, shown in Figure 2 later, is implemented by, for example, memory 102, but may be implemented by a different storage device. Alternatively, the map storage unit 130 may be implemented by an external device to the terminal device 10. In this case, the terminal device 10 may acquire map data stored in this external device by receiving it from the external device.

[0015] The processor 101 reads a program from the memory 102 and executes it, thereby performing the processing of the illuminance acquisition unit 110, the position acquisition unit 120, and the display control unit 140, as shown in Figure 2, which will be described later. The processor 101 may be, for example, a microprocessor, an MPU (Micro Processor Unit), or a CPU (Central Processing Unit). The processor 101 may include multiple processors. Thus, the terminal device 10 is equipped with the functions of a computer.

[0016] The program, when loaded into a computer, includes a set of instructions (or software code) for causing the computer to perform one or more functions as described in the embodiments. The program may be stored on a non-temporary computer-readable medium or a physical storage medium. Examples, but not limited to, include random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technologies, CD-ROM, digital versatile disc (DVD), Blu-ray® disc or other optical disc storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage devices. The program may be transmitted over a temporary computer-readable medium or a communication medium. Examples, but not limited to, include temporary computer-readable medium or a communication medium that includes electrically, optically, acoustically or otherwise propagating signals.

[0017] The light sensor 200 is a sensor that detects the illuminance outside the terminal device 10 (more specifically, the display 220). In other words, the light sensor 200 is a sensor that detects the illuminance around the terminal device 10 (more specifically, the display 220). If the terminal device 10 is an in-vehicle device, the light sensor 200 may detect the illuminance around the vehicle. The light sensor 200 is also called an illuminance sensor. The light sensor 200 is a sensor that outputs a voltage value corresponding to the illuminance as the detected illuminance value. The light sensor outputs the detected illuminance value to the control device 100.

[0018] The GNSS antenna 210 is an antenna that receives signals transmitted from GNSS satellites such as GPS (Global Positioning System) satellites, and outputs the received signals to the control device 100.

[0019] The display 220 is a device that displays information on its screen according to the control of the control device 100. For example, the display 220 displays navigation information showing the route to the destination according to the control of the control device 100, but it may also display other information. The display 220 is a flat panel display such as a liquid crystal display, plasma display, or organic EL (Electro-Luminescence) display.

[0020] Next, the functional configuration of the terminal device 10 will be described with reference to Figure 2. As shown in Figure 2, the terminal device 10 includes an illuminance acquisition unit 110, a position acquisition unit 120, a map storage unit 130, and a display control unit 140.

[0021] The illuminance acquisition unit 110 acquires the detected illuminance value outside the terminal device 10. In this embodiment, the illuminance acquisition unit 110 acquires the detected value by receiving the detected value output from the light sensor 200. The illuminance acquisition unit 110 does not necessarily have to acquire the detected illuminance value outside the terminal device 10 from the light sensor 200 provided by the terminal device 10. For example, the illuminance acquisition unit 110 may acquire the detected illuminance value outside the terminal device 10 from a sensor provided separately from the terminal device 10. In this case, the terminal device 10 does not have to have the light sensor 200. Thus, the illuminance acquisition unit 110 can acquire the detected illuminance value outside the terminal device 10 by any method.

[0022] The position acquisition unit 120 acquires position data indicating the position of the terminal device 10. In this embodiment, the position acquisition unit 120 acquires position data indicating the current position of the terminal device 10 by receiving a signal output from the GNSS antenna 210. The position acquisition unit 120 does not necessarily have to acquire data indicating the current position of the terminal device 10 based on the output signal from the GNSS antenna 210 equipped on the terminal device 10. For example, the position acquisition unit 120 may acquire position data from a device other than the terminal device 10, such as another device equipped on the vehicle on which the terminal device 10 is mounted. In this case, the terminal device 10 does not have to have a GNSS antenna 210. Thus, the position acquisition unit 120 can acquire the position data of the terminal device 10 by any method.

[0023] The map storage unit 130 stores map data in advance that shows the locations of predetermined facilities. Here, predetermined facilities are facilities used to control the switching of display modes of the display 220, and include, for example, at least one of a tunnel and a predetermined lighting facility. Here, a lighting facility is a facility that has lighting equipment that illuminates the area around the lighting facility with an illuminance of a predetermined level or higher. Specifically, the area around the lighting facility refers to, for example, a road adjacent to the lighting facility. Furthermore, the lighting facility may be a lighting equipment that illuminates with an illuminance of a predetermined level or higher, and may also be a facility that has lighting equipment that illuminates the area around the lighting facility with an illuminance near the illuminance threshold described later. In other words, the illuminance near the illuminance threshold is an illuminance in which the amount of deviation from the illuminance threshold falls within a predetermined range. Lighting facilities are, for example, shopping districts, gas stations, large electronics retailers, etc., but are not limited to these.

[0024] The display control unit 140 controls the display on the display 220. In particular, the display control unit 140 switches whether to display information on the display 220 in a first display mode or a second display mode. The display control unit 140 continuously checks the acquired illuminance detection value against a predetermined illuminance threshold TH I The above conditions apply, or the detected illuminance value continues to exceed the illuminance threshold TH. Iwhen the detected illuminance value is lower than the predetermined time threshold TH T The mode is switched based on whether or not the above state continues for more than the predetermined time threshold. Here, the first display mode and the second display mode are modes in which the screen brightness of the display when displaying information is different from each other. In the present embodiment, the first display mode is a mode in which the screen brightness of the display when displaying information is brighter than that when the same information is displayed in the second display mode. The first display mode is a display mode that is mainly set during daytime. Hereinafter, the first display mode is also referred to as a daytime mode. Similarly, the second display mode is a mode in which the screen brightness of the display when displaying information is darker than that when the same information is displayed in the first display mode. The second display mode is a display mode that is mainly set at night. Hereinafter, the second display mode is also referred to as a nighttime mode. The display control unit 140 may switch the display mode by any known technique. For example, the display control unit 140 may switch the screen brightness by changing the colors used for display, may switch the screen brightness by adjusting the light intensity of the backlight of the display 220, or may switch the screen brightness by adjusting the luminance of the display 220.

[0025] In the present embodiment, the display control unit 140 determines that the acquired illuminance detection value is continuously above the illuminance threshold TH I and when this state continues for more than the time threshold TH T it controls the display of the display 220 to perform display in the daytime mode (the first display mode). That is, when display is being performed in the nighttime mode, and the acquired illuminance detection value is continuously above the illuminance threshold TH I and this state continues for more than the time threshold TH T the display control unit 140 switches the display from the nighttime mode to the daytime mode. Similarly, the display control unit 140 determines that the acquired illuminance detection value is continuously below the illuminance threshold TH I and when this state is lower than the time threshold TH TIf the above conditions persist, the display on display 220 is controlled to display in night mode (second display mode). In other words, when the display is in day mode, if the acquired illuminance detection value continues to exceed the illuminance threshold TH I The state of being less than the time threshold TH T If the above process continues, the display control unit 140 will switch from daytime display mode to nighttime display mode.

[0026] In particular, the display control unit 140 selects a value from among a plurality of predetermined values ​​according to the situation, and sets a predetermined time threshold TH T It is used as such. Note that the time threshold TH T The value of is a predetermined value other than 0. That is, the time threshold TH T The value of is a time greater than 0. Specifically, the display control unit 140 sets a value according to whether the position indicated in the position data acquired by the position acquisition unit 120 is near the predetermined facility described above, and sets the time threshold TH T It is used as follows. Here, the vicinity of a predetermined facility refers, for example, to an area within a predetermined range from the predetermined facility. In this embodiment, when the position indicated in the position data is near the lighting facility, the display control unit 140 sets a first time threshold TH that is longer than the time threshold used when the position indicated in the position data is not near the lighting facility. T_1 The time threshold is used. In addition, the display control unit 140 sets a second time threshold TH that is shorter than the time threshold used when the position indicated in the position data is not near the tunnel, if the position indicated in the position data is near the tunnel. T_2 The time threshold TH is used. In addition, the display control unit 140 sets the time threshold TH if the position indicated in the position data is neither near the lighting facility nor near the tunnel. T_1 Shorter time and time threshold TH T_2 A third time threshold TH that is longer than T_3 The time threshold TH is used. However, if the position indicated in the position data is neither near the lighting facility nor near the tunnel, the display control unit 140 will use the time threshold TH. T_1 or time threshold TH T_2Either of the above thresholds may be used as the time threshold. The display control unit 140 may also use a fourth time threshold used when the terminal device 10 is located near a specific facility other than the predetermined facility. Furthermore, the predetermined facility mentioned above does not have to include a tunnel; in that case, the second time threshold TH may be used. T_2 The first time threshold TH is not used. Similarly, the specified facilities described above do not have to include lighting facilities, in which case the first time threshold TH is used. T_1 It is not used.

[0027] In this embodiment, as described above, the display mode is controlled using a time threshold corresponding to the position of the terminal device 10. The advantages of this will be explained below. Regardless of the situation, a constant time threshold TH is always used. T_0 If this is used, the following problems may occur. For example, even if the terminal device 10 (vehicle) enters a tunnel, the display mode may not switch immediately. Specifically, for example, if a vehicle traveling during the day enters a tunnel that is dark inside, the display mode may not switch immediately from day mode to night mode. In other words, the visibility of the display 220 may be reduced for a long period of time inside the tunnel. This is because a certain time threshold TH is used as the value of the time threshold for switching the display mode near the tunnel. T_0 This occurs because the value is too large. On the other hand, a certain time threshold TH T_0 If the value of is reduced, the display mode may not be appropriate when moving outside of tunnels. For example, when the terminal device 10 passes through the shade of trees, the display mode may switch frequently, causing annoyance to the user. In contrast, in this embodiment, when the terminal device 10 moves near a tunnel, a second time threshold TH, which is different from the time threshold used in other cases, is used. T_2 The display mode is switched using this method. Therefore, the display mode can be appropriately switched whether the terminal device 10 is moving through a tunnel or in another location. Consequently, the convenience of displaying information on the display 220 can be improved.

[0028] Furthermore, regardless of the situation, a constant time threshold TH is always maintained. T_0 When used, the following problems may also occur. For example, when the terminal device 10 (vehicle) moves near a lighting facility, the display mode may switch frequently. Specifically, for example, when a vehicle traveling at night moves near a lighting facility, the display mode may switch frequently from night mode to day mode and from day mode to night mode. This phenomenon occurs because when the terminal device 10 (vehicle) passes near a lighting facility, the terminal device 10 (vehicle) enters a bright environment from a dark environment and then returns to a dark environment from a bright environment, all within a short period of time. In addition, the lighting facility has an illuminance threshold TH I If the facility has lighting equipment that illuminates the area surrounding the lighting facility with the illuminance of the vicinity, when the terminal device 10 is moving near the lighting facility, the detected illuminance value will be the illuminance threshold TH. I This occurs because the illuminance fluctuates in the vicinity, causing the conditions for activating day mode or night mode to be met. To prevent this, when the display is in night mode, if the terminal device 10 moves near the lighting facility, the detected illuminance value will temporarily be set to the illuminance threshold TH. I Even if the above occurs, it is necessary to control the system so that the display mode is not immediately switched. In this embodiment, when the terminal device 10 is located near the lighting facility, a first time threshold TH is used that is longer than the time threshold used when the terminal device 10 is located elsewhere. T_1 This is used as the time threshold. This prevents frequent switching of the display mode when the terminal device 10 (vehicle) passes near the lighting facility. Therefore, the convenience of displaying information on the display 220 can be improved.

[0029] Next, the flow of the operation for determining the display mode in the terminal device 10 will be described. Figure 3 is a flowchart showing an example of the flow of the operation for determining the display mode by the terminal device 10 according to Embodiment 1. The flow of the operation for determining the display mode will be described below with reference to Figure 3. Note that the execution order of the processes shown in the flowchart of Figure 3 is merely an example, and the execution order can be changed as appropriate as long as no technical inconsistencies occur. In addition, the series of processes shown in the flowchart of Figure 3 are repeatedly executed during the operation of the terminal device 10.

[0030] In step S100, the position acquisition unit 120 acquires position data indicating the position of the terminal device 10. Next, in step S101, the display control unit 140 uses the map data read from the map storage unit 130 and the location data acquired in step S100 to determine whether the current location of the terminal device 10 is near the lighting facility. If the current location of the terminal device 10 is near the lighting facility, the process proceeds to step S103; otherwise, the process proceeds to step S102. In step S102, the display control unit 140 uses the map data read from the map storage unit 130 and the location data acquired in step S100 to determine whether the current location of the terminal device 10 is near the tunnel. If the current location of the terminal device 10 is near the tunnel, the process proceeds to step S104; otherwise, the process proceeds to step S105.

[0031] In step S103, the display control unit 140 determines the display mode using a first time threshold TH, which is a large time threshold. T_1 It is decided to use [this]. Then, the process proceeds to step S106. Furthermore, in step S104, the display control unit 140 determines the display mode using a second time threshold TH, which is a smaller time threshold. T_2 It is decided to use [this]. Then, the process proceeds to step S106. Furthermore, in step S105, the display control unit 140 determines the display mode using a first time threshold TH T_1and the second time threshold TH T_2 The third time threshold TH is an intermediate time threshold. T_3 It is decided to use [this]. Then, the process proceeds to step S106.

[0032] In step S106, the illuminance acquisition unit 110 acquires the detected illuminance value from outside the terminal device 10. Next, in step S107, the display control unit 140 determines the display mode using the time threshold determined in step S103, step S104, or step S105 and the illuminance detection value acquired in step S106. As a result, for example, when the terminal device 10, which is displaying in night mode, reaches the vicinity of the lighting facility, the display control unit 140 determines that the acquired illuminance detection value continues to reach the illuminance threshold TH I The above state is the time threshold TH T_1 Unless the above conditions are met, the display mode will not be switched from night mode to day mode. Also, for example, when terminal device 10, which is displaying in day mode, approaches the vicinity of a tunnel, the display control unit 140 will continue to use the acquired illuminance detection value to maintain the illuminance threshold TH I The state of being less than the time threshold TH T_2 If the above conditions persist, the display mode is switched from daytime mode to nighttime mode. This allows for a quick switch in the display mode when the terminal device 10 enters a tunnel. The display control unit 140 determines the display mode not only based on the location of the terminal device 10 on the map, but also based on the detected illuminance value. Therefore, for example, when the terminal device 10 is moving through a tunnel that is sufficiently bright inside, it is possible to prevent the display from being switched to nighttime mode. This allows for more appropriate display.

[0033] Embodiment 1 has been described above. In this embodiment, as described above, the display mode is controlled using a time threshold corresponding to the position of the terminal device 10. Therefore, the convenience of displaying information on the display 220 can be improved.

[0034] <Embodiment 2> Next, Embodiment 2 will be described. In Embodiment 1, the display mode can be switched appropriately near lighting facilities that are pre-registered in the map data, but in other locations, there is still a risk of the display mode switching occurring in a short period of time. In this embodiment, the location where the display mode switching in a short period of time actually occurred is recorded, and when the terminal device passes through the recorded location again, the display mode switching in a short period of time is prevented. The following describes the configuration and processing that differ from Embodiment 1, and the description of the configuration and processing that are the same as in Embodiment 1 will be omitted.

[0035] Figure 4 is a block diagram showing an example of the functional configuration of a terminal device 11 according to Embodiment 2. As shown in Figure 4, the terminal device 11 according to Embodiment 2 differs from the terminal device 10 according to Embodiment 1 in that it further includes a recording processing unit 150 and the display control unit 140 is replaced by a display control unit 141. The functions of the display control unit 141 and the recording processing unit 150 are also realized, for example, by the processor 101 reading and executing a program from the memory 102.

[0036] The display control unit 141 in this embodiment performs the following processing in addition to the processing of the display control unit 140 in Embodiment 1. That is, if the current position of the terminal device 11 is near a position recorded by the recording processing unit 150 described later, the display control unit 141 sets a first time threshold TH T_1 This is used to control the switching of the display mode.

[0037] If the display mode is switched two or more times within a predetermined period, the recording processing unit 150 adds the location where the switch occurred to the map data stored in the map storage unit 130 as the location of the lighting facility. In other words, the recording processing unit 150 performs recording processing if the display mode changes from one mode to another within a predetermined period, and then returns to the same mode again. Specifically in this embodiment, if the display mode switches from night mode to day mode, and then from day mode to night mode within a predetermined period, the recording processing unit 150 adds the location where these switches occurred to the map data as the location of the lighting facility.

[0038] In this embodiment, the following values ​​are specifically set for this predetermined period. For the display mode to switch, the detected illuminance value must be the illuminance threshold TH I The state or detected value being above the illuminance threshold TH I The state of being less than the time threshold must continue for a period of time greater than or equal to the time threshold. In other words, the display mode will not switch more than twice within a period less than the time threshold. Therefore, it is preferable that the minimum value of the period that can be set as the predetermined period described above is the minimum value that can be set as the time threshold. Accordingly, in this embodiment, specifically, the minimum value of the period that can be set as the predetermined period described above is the second time threshold TH T_2 It is equal to the value of . Also, a first time threshold TH is used when the terminal device 11 is located near the position recorded by the recording processing unit 150. T_1 According to TH T_1 During the period represented by the value, the switching of the display mode will be suppressed. In other words, the detected illuminance value will be the illuminance threshold TH. I The state or detected value being above the illuminance threshold TH I The state of being less than TH T_1 If it continues for a period longer than the value of , the first time threshold TH T_1 Therefore, it is not possible to suppress the occurrence of switching display modes. Accordingly, the maximum value of the period that can be set as the predetermined period described above is the first time threshold TH T_1It is preferable that it be less than . In other words, the value of the period that can be set as the predetermined period described above is a value greater than or equal to the minimum value that can be set as the time threshold, and the first time threshold TH T_1 It is preferable that the value is any value less than the value set as the value.

[0039] Furthermore, even if a short-term switch in the display mode occurred when moving near a lighting facility in the past, it does not necessarily mean that a short-term switch in the display mode will occur again when moving near the same lighting facility the next time. For example, if the time of day when moving near the lighting facility is different, a short-term switch in the display mode may not occur. Therefore, if the recording processing unit 150 records the time period in which the switch occurred if it occurs two or more times within a predetermined period. The display control unit 141 may then refer only to lighting facilities among the newly added lighting facilities in the map data for which a time period corresponding to the current time has been recorded, and determine the time threshold used for switching the display mode. However, in this case, the recording processing unit 150 and the display control unit 141 should be able to acquire time information using any known technique. By doing so, more appropriate control can be achieved. It should be noted that whether or not a short-term switch in the display mode occurs can be influenced by various factors, not just the time of day. In other words, the detected illuminance value can be influenced by various factors. For example, it may be affected by weather conditions. Therefore, the recording processing unit 150 may record observation data when a short-term switch in the display mode occurs, and observation data for any factor that affects the detected illuminance value. However, in this case, the recording processing unit 150 and the display control unit 141 can acquire observation data for any factor using any known technique.

[0040] Next, the flow of the operation for determining the display mode in the terminal device 11 will be described. Figure 5 is a flowchart showing an example of the flow of the operation for determining the display mode by the terminal device 11 according to Embodiment 2. The flowchart shown in Figure 5 differs from the flowchart shown in Figure 3 in that it further includes steps S108 and S109 as steps performed after step S107. The differences from the flowchart shown in Figure 3 will be explained below. Note that the execution order of the processes shown in the flowchart of Figure 5 is merely an example, and the execution order can be changed as appropriate as long as no technical inconsistencies occur. Also, the series of processes shown in the flowchart of Figure 5 are repeatedly executed during the operation of the terminal device 11.

[0041] In this embodiment, after step S107, the process proceeds to step S108. In step S108, the recording processing unit 150 determines whether the display mode has been switched two or more times within a predetermined period. If the display mode has been switched two or more times within the predetermined period, the process proceeds to step S109.

[0042] In step S109, the recording processing unit 150 adds the newly discovered lighting facilities, determined by the judgment process in step S108, to the map data. At this time, the recording processing unit 150 may also record the time period, etc. As a result, the recording processing unit 150 updates the map data. With this update, the processing in the next step S101 is performed using the updated map data, and frequent switching of the display mode when moving near newly discovered lighting facilities is suppressed.

[0043] Embodiment 2 has been described above. In this embodiment, as mentioned above, the map data is updated. Therefore, frequent switching of the display mode in the vicinity of lighting facilities that are not pre-registered in the map data is suppressed.

[0044] Although embodiments have been described above, the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention.

[0045] Some or all of the above embodiments may also be described as follows, but are not limited to the following: (Note 1) A terminal device equipped with a display, An illuminance acquisition unit that acquires an illuminance detection value from outside the terminal device, A position acquisition unit that acquires position data indicating the location of the terminal device, A map storage unit that stores map data showing the location of a designated facility, A display control unit switches whether to display information on the display in a first display mode or a second display mode based on whether the detected value has been continuously above a predetermined illuminance threshold or whether the detected value has been continuously below the illuminance threshold for a predetermined time threshold or longer. It has, The first display mode and the second display mode are modes in which the brightness of the display screen is different from that of the display when the information is displayed. The display control unit uses a value as the time threshold that corresponds to whether or not the position indicated in the position data is near the predetermined facility. Terminal device. (Note 2) The aforementioned designated facility includes a lighting facility which is a facility having lighting equipment that illuminates the surrounding area with an illuminance of a predetermined level or higher. The display control unit, when the position indicated in the position data is near the lighting facility, uses a first time threshold as the time threshold that is longer than the time threshold used when the position indicated in the position data is not near the lighting facility. The terminal device described in Appendix 1. (Note 3) The aforementioned designated facilities include a tunnel, The display control unit, when the position indicated in the position data is near the tunnel, uses a second time threshold as the time threshold, which is shorter than the time threshold used when the position indicated in the position data is not near the tunnel. The terminal device described in Appendix 1 or 2. (Note 4) The system further includes a recording processing unit that, if the display mode is switched two or more times within a predetermined period, adds the location where the switch occurred to the map data as the location of the lighting facility. The terminal device described in Appendix 2. (Note 5) If the recording processing unit detects that the display mode has been switched two or more times within a predetermined period, it further records the time period during which the switch occurred. The display control unit refers only to the lighting facilities among the newly added lighting facilities in the map data for which a time period corresponding to the current time is recorded, and determines the time threshold used for switching the display mode. The terminal device described in Appendix 4. (Note 6) A display control method using a terminal device equipped with a display, The detected illuminance value outside the terminal device is acquired, Location data indicating the location of the terminal device is acquired, It stores map data showing the location of a designated facility, The system switches between displaying information on the display in a first display mode or a second display mode based on whether the detected value has been continuously above a predetermined illuminance threshold or whether the detected value has been continuously below the illuminance threshold for a predetermined time threshold or longer. The first display mode and the second display mode are modes in which the brightness of the display screen is different from that of the display when the information is displayed. As the time threshold, a value is used that corresponds to whether or not the location indicated in the location data is in the vicinity of the predetermined facility. Display control method. (Note 7) In a computer of a terminal device equipped with a display, An illuminance acquisition step to acquire an illuminance value detected from outside the terminal device, A position acquisition step of acquiring position data indicating the location of the terminal device, A storage step of storing map data that shows the location of a predetermined facility, A display control step which switches whether to display information on the display in a first display mode or a second display mode based on whether the detected value has been continuously above a predetermined illuminance threshold or whether the detected value has been continuously below the illuminance threshold for a predetermined time threshold or longer. Make it run, The first display mode and the second display mode are modes in which the brightness of the display screen is different from that of the display when the information is displayed. In the display control step, the time threshold is a value that corresponds to whether or not the position indicated in the position data is near the predetermined facility. program. [Explanation of Symbols]

[0046] 10 Terminal devices 11 Terminal device 100 Control device 101 Processors 102 memory 110 Illuminance acquisition section 120 Position acquisition part 130 Map storage unit 140 Display Control Unit 141 Display Control Unit 150 Recording Processing Unit 200 Light Sensors 210 Antenna 220 displays

Claims

1. A terminal device equipped with a display, An illuminance acquisition unit that acquires an illuminance detection value from outside the terminal device, A position acquisition unit that acquires position data indicating the location of the terminal device, A map storage unit that stores map data indicating the location of a lighting facility, which is a facility that has lighting equipment that illuminates the surrounding area with an illuminance of a predetermined level or higher, A display control unit switches whether to display information on the display in a first display mode or a second display mode based on whether the detected value has been continuously above a predetermined illuminance threshold or whether the detected value has been continuously below the illuminance threshold for a predetermined time threshold or longer. It has, The first display mode and the second display mode are modes in which the brightness of the display screen is different from that of the other when displaying the information. The display control unit, when the position indicated in the position data is near the lighting facility, uses a first time threshold as the time threshold that is longer than the time threshold used when the position indicated in the position data is not near the lighting facility. Terminal device.

2. The system further includes a recording processing unit that, if the display mode is switched two or more times within a predetermined period, adds the location where the switch occurred to the map data as the location of the lighting facility. The terminal device according to claim 1.

3. If the recording processing unit detects that the display mode has been switched two or more times within a predetermined period, it further records the time period during which the switch occurred. The display control unit refers only to the lighting facilities among the newly added lighting facilities in the map data for which a time period corresponding to the current time is recorded, and determines the time threshold used for switching the display mode. The terminal device according to claim 2.

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