KR102120424B1 - Luminance control device of display device and method thereof - Google Patents

Abstract

The luminance adjustment device of the display device stores luminance selection data for a plurality of luminance selection objects for manually adjusting the luminance of the display device, and transmits the luminance selection data to the display device, thereby displaying the plurality on the screen of the display device. A manual luminance setting unit configured to display a luminance selection object of, and generate manual luminance setting information corresponding to a luminance selection object selected from the plurality of luminance selection objects, and the maximum luminance of the display device according to the manual luminance setting information. And a maximum luminance adjustment section to be adjusted.

Description

Luminance control device and method of display device {LUMINANCE CONTROL DEVICE OF DISPLAY DEVICE AND METHOD THEREOF}

The present invention relates to an apparatus and method for adjusting brightness of a display device, and more particularly, to an apparatus and method for adjusting brightness of a display device in a manual mode.

Mobile phones, portable media players (PMPs), tablet PCs (tablet PCs), laptops, etc. are mobile devices that can be used wherever users want. Such mobile devices are used in various surrounding environments due to mobility.

In particular, one of the factors influencing the use of mobile devices is the illuminance of the surrounding environment. The screen of the mobile device may not be properly displayed in a place where the ambient light is too bright, and the screen of the mobile device may be too bright in a place where the ambient light is too bright, which may dazzle the user.

In order to solve the inconvenience caused by the difference in the luminance of the surrounding environment and the screen brightness of the mobile device, an automatic luminance adjustment function is added to the mobile device. The automatic brightness adjustment function is a function that automatically adjusts the brightness of a mobile device according to the ambient light intensity by measuring the light intensity of the surrounding environment with an optical sensor. This automatic brightness adjustment function has a limitation in that it is impossible to adjust the brightness of the mobile device in an optimal state felt by the user.

In addition, an automatic luminance adjustment function is not added to some mobile devices without an optical sensor, and only a manual luminance adjustment function in which a user must directly adjust the luminance of the mobile device is added.

Typical mobile devices, such as mobile phones and tablet PCs, have a lock mode function to restrict the use of other users. The lock mode function displays a lock screen requesting a user to input a specific pattern or password specified by the user, and unlocks the lock mode when the correct pattern or password is input from the lock screen so that the mobile device can be used.

After the lock mode of the mobile device is released, the brightness of the mobile device is adjusted according to the automatic brightness adjustment function. Alternatively, after the lock mode of the mobile device is released, the user must manually adjust the brightness of the mobile device by executing a manual brightness adjustment function.

However, the lock screen of the mobile device may not be properly displayed due to the illumination of the surrounding environment. For example, when the lock screen is displayed outdoors in the sun, the lock screen may not be properly displayed to the user, and the user may have difficulty unlocking the lock mode. In addition, even when the luminance of the mobile device is adjusted by the manual luminance adjustment function after the lock mode is released, there is a inconvenience that the screen for adjusting the luminance is not properly displayed to the user.

The technical problem to be solved by the present invention is to provide a luminance adjustment device and method for easily and conveniently adjusting the brightness of a display device in a manual mode.

A luminance adjustment device of a display device according to an embodiment of the present invention stores luminance selection data for a plurality of luminance selection objects for manually adjusting the luminance of the display device, and transmits the luminance selection data to the display device A manual luminance setting unit that causes the plurality of luminance selection objects to be displayed on a screen of the display device and generates manual luminance setting information corresponding to a luminance selection object selected from the plurality of luminance selection objects, and the manual luminance setting information. Accordingly, it includes a maximum luminance adjustment unit for adjusting the maximum luminance of the display device.

The plurality of luminance selection objects may include patterns displayed in a plurality of predetermined levels of gradation based on different maximum luminances.

The manual luminance setting information may indicate a maximum luminance that is a reference of a luminance selection object selected from the plurality of luminance selection objects.

Each of the plurality of luminance selection objects may be divided into a plurality of gradation regions, and the plurality of gradation regions may correspond to the gradation of the plurality of predetermined levels.

When in a lock mode in which a lock release object is displayed on the screen, the manual luminance setting unit may transmit the luminance selection data to the display device so that the luminance selection object is displayed together with the unlock object on the screen.

The maximum luminance adjusting unit may adjust the maximum luminance of the display device to the maximum luminance indicated by the manual luminance setting information after the lock mode is released.

A mode confirmation unit that checks mode information indicating a mode for adjusting the brightness of the display device, and automatically acquires illuminance information to automatically adjust the brightness of the display device, and generates automatic luminance setting information according to the illuminance information A luminance setting unit may be further included.

The mode check unit may transmit a manual mode indicator to the manual luminance setting unit when the mode information indicates a manual mode, and a lock mode indicator to the manual luminance setting unit when the mode information indicates the lock mode.

The manual luminance setting unit may transmit the luminance selection data to the display device when one of the manual mode indicator and the lock mode indicator is received.

The mode check unit may transmit an automatic mode indicator to the automatic brightness setting unit when the mode information indicates an automatic mode, and the automatic brightness setting unit may generate the automatic brightness setting information when the automatic mode indicator is received.

The maximum luminance adjusting unit may adjust the maximum luminance of the display device according to the automatic luminance setting information.

According to another embodiment of the present invention, a method for adjusting luminance of a display device includes displaying a plurality of luminance selection objects for adjusting luminance of the display device on a screen of the display device, and a luminance selection object selected from the plurality of luminance selection objects And generating manual luminance setting information corresponding to and adjusting the maximum luminance of the display device according to the manual luminance setting information.

The plurality of luminance selection objects may include patterns displayed in a plurality of predetermined levels of gradation based on different maximum luminances.

The manual luminance setting information may indicate a maximum luminance that is a reference of a luminance selection object selected from the plurality of luminance selection objects.

Each of the plurality of luminance selection objects may be divided into a plurality of gradation regions, and the plurality of gradation regions may correspond to the gradation of the plurality of predetermined levels.

The method further includes: checking mode information indicating a mode for adjusting the brightness of the display device, and determining whether the mode information indicates one of a manual mode, a lock mode, and an automatic mode. When one of the manual mode and the lock mode is indicated, the plurality of luminance selection objects may be displayed on the screen of the display device.

The displaying of a plurality of luminance selection objects for adjusting the luminance of the display device on the screen of the display device may include when the mode information indicates the lock mode, the plurality of luminance selection objects together with the unlocking object on the screen of the display device. And displaying a luminance selection object of.

After displaying the luminance selection object together with the unlocking object on the screen of the display device, when the lock mode is released, the maximum luminance of the display device is the maximum luminance that is the reference of the luminance selection object selected from the plurality of luminance selection objects. It may further include the step of adjusting.

When the mode information indicates the automatic mode, the method may further include measuring illuminance of a surrounding environment of the display device to obtain illuminance information, and generating automatic luminance setting information corresponding to the illuminance information.

The method may further include adjusting the maximum luminance of the display device according to the automatic luminance setting information.

The brightness of the display device can be easily and conveniently adjusted to the optimal state felt by the user.

In particular, since the user can select a luminance suitable for his/her eyesight in the lock mode of the display device, discomfort due to the illuminance of the surrounding environment when releasing the lock mode can be eliminated.

1 is a block diagram illustrating an apparatus for adjusting luminance of a display device according to an exemplary embodiment of the present invention.
2 is an exemplary view illustrating a plurality of luminance selection objects displayed on a screen of a display device according to an exemplary embodiment of the present invention.
3 is an exemplary view showing a shape of a luminance selection object according to an embodiment of the present invention.
4 is an exemplary diagram illustrating a plurality of luminance selection objects displayed in a lock mode of a display device according to an exemplary embodiment of the present invention.
5 is a flowchart illustrating a method for adjusting luminance of a display device according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice. The present invention can be implemented in many different forms and is not limited to the embodiments described herein.

In addition, in various embodiments, components having the same configuration are typically described in the first embodiment using the same reference numerals, and in other embodiments, only the configuration different from the first embodiment will be described. .

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar elements throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . Also, when a part “includes” a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise specified.

1 is a block diagram illustrating an apparatus for adjusting luminance of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the brightness adjustment device 100 includes a mode check unit 110, a manual brightness setting unit 120, an automatic brightness setting unit 130, and a maximum brightness adjustment unit 140.

The mode check unit 110 checks mode information (MI) indicating a mode for adjusting the luminance of the display device 200. The mode information MI may be provided from the display device 200. The mode information MI is one of a manual mode in which the luminance of the display device 200 is manually adjusted, an automatic mode in which the luminance of the display device 200 is automatically adjusted, and a lock mode in which the display device 200 is locked. Can instruct. The mode check unit 110 transmits a manual mode indicator (MMI) to the manual luminance setting unit 120 when the mode information MI indicates a manual mode. The mode check unit 110 transmits a lock mode indicator (LMI) to the manual luminance setting unit 120 when the mode information MI indicates a lock mode. The mode check unit 110 transmits an auto mode indicator (AMI) to the automatic luminance setting unit 130 when the mode information MI indicates an automatic mode.

The manual luminance setting unit 120 stores luminance selection data (LSD) for a plurality of luminance selection objects (see LSO1 to LSOn in FIG. 2) for manually adjusting the luminance of the display device 200. . The plurality of luminance selection objects include patterns displayed in a plurality of predetermined levels of gradation based on different maximum luminances. Each of the plurality of luminance selection objects is divided into a plurality of gradation areas, and the plurality of gradation areas may correspond to a plurality of gradation levels. The plurality of luminance selection objects will be described later in FIGS. 2 and 3. The luminance selection data LSD is data for displaying a plurality of luminance selection objects on the display device 200.

When one of the manual mode indicator (MMI) and the lock mode indicator (LMI) is received, the manual luminance setting unit 120 transmits the luminance selection data LSD to the display device 200 to display the screen of the display device 200. A plurality of luminance selection objects are displayed.

The display device 200 has a display function for displaying an image on a screen and a touch function for recognizing a touch as an input signal. The display device 200 includes a mobile device such as a mobile phone, a portable media player (PMP), a tablet PC (tablet PC), or a laptop. The display device 200 displays a plurality of luminance selection objects on the screen according to the luminance selection data LSD. When in the lock mode, the display device 200 may display a lock release object for unlocking on the screen. When the luminance selection data LSD is transmitted to the display apparatus 200 when the display apparatus 200 is in the lock mode, a luminance selection object may be displayed on the screen of the display apparatus 200 together with an unlocking object. When the user selects any one of the plurality of luminance selection objects, the display device 200 transmits luminance selection information (LSI) indicating the selected luminance selection object to the manual luminance setting unit 120.

The manual luminance setting unit 120 generates manual luminance setting information (MLSI) corresponding to the luminance selection object indicated by the luminance selection information LSI and transmits it to the maximum luminance adjustment unit 140. The manual luminance setting information (MLSI) indicates a maximum luminance that is a reference for a luminance selection object selected from a plurality of luminance selection objects.

The automatic luminance setting unit 130 acquires luminance information (LI) for automatically adjusting the luminance of the display device 200 when an automatic mode indicator (AMI) is received. The illuminance of the surrounding environment is measured by an illuminance sensor (not shown), and illuminance information LI indicating the measured illuminance is transmitted to the automatic luminance setting unit 130. The automatic luminance setting unit 130 generates automatic luminance setting information (ALSI) according to the illuminance information LI and transmits it to the maximum luminance adjusting unit 140. The automatic luminance setting information ALSI may be set to increase the maximum luminance of the display device 200 in proportion to the illuminance of the surrounding environment.

The maximum luminance adjustment unit 140 transmits the maximum luminance control information (MLCI) to the display device 200 according to one of the manual luminance setting information (MLSI) and the automatic luminance setting information (ALSI), and then displays the display device 200 Adjust the maximum luminance of (200). When the display device 200 is in the lock mode, the maximum luminance adjusting unit 140 is the maximum luminance indicated by the manual luminance setting information (MLSI) after the lock mode of the display device 200 is released. Brightness can be adjusted. In addition, when the display device 200 is in the lock mode, the maximum luminance adjusting unit 140 displays the display device 200 at the maximum luminance indicated by the manual luminance setting information (MLSI) even before the lock mode of the display device 200 is released. ) Can also be adjusted.

In FIG. 1, although the brightness adjustment device 100 is illustrated as being provided separately from the display device 200, the brightness adjustment device 100 may be actually included in the display device 200. For example, the brightness adjusting device 100 may be included in a driving chip provided with an operating system for operating the display device 200 or may be provided as a separate driving chip and mounted inside the display device 200.

2 is an exemplary view illustrating a plurality of luminance selection objects displayed on a screen of a display device according to an exemplary embodiment of the present invention. 3 is an exemplary view showing a shape of a luminance selection object according to an embodiment of the present invention.

2 and 3, a plurality of luminance selection objects LSO1 to LSOn are displayed on the screen 210 of the display device.

The plurality of luminance selection objects LSO1 to LSOn represent different maximum luminances. That is, the plurality of luminance selection objects LSO1 to LSOn correspond to different maximum luminances. The plurality of luminance selection objects LSO1 to LSOn include patterns displayed in a plurality of predetermined levels of gradation based on different maximum luminances.

As illustrated in FIG. 2, the plurality of luminance selection objects LSO1 to LSOn may be displayed in an identical pattern and arranged on the screen 210 of the display device. Each of the plurality of luminance selection objects LSO1 to LSOn is divided into a plurality of gradation regions a to e, and the plurality of gradation regions a to e are represented by a plurality of gradation levels. At this time, the level of the gradation corresponding to the plurality of gradation regions a to e may be determined equally among the plurality of luminance selection objects LSO1 to LSOn. Since the plurality of luminance selection objects LSO1 to LSOn are based on different maximum luminances, luminances of the plurality of gradation regions a to e are different between the plurality of luminance selection objects LSO1 to LSOn.

Table 1 shows an example of gradation and luminance of a plurality of luminance selection objects LSO1 to LSOn.

The gradation of each gradation region (a to e) was determined to be 87, 48, 43, 38, and 33, and the luminance of each gradation region (a to e) was displayed according to the maximum luminance as a reference. Since the plurality of luminance selection objects LSO1 to LSOn are based on different maximum luminances, it can be seen that the luminance of the plurality of gradation regions a to e is different between the plurality of luminance selection objects LSO1 to LSOn. .

When the plurality of luminance selection objects LSO1 to LSOn are displayed on the screen 210 of the display device, some of the plurality of luminance selection objects LSO1 to LSOn are displayed to the user according to the luminance of the surrounding environment. ) Can be recognized separately. On the other hand, some of the plurality of luminance selection objects LSO1 to LSOn may not be recognized because the gradation areas a to e are separated from the user. The user can select a luminance selection object in which gradation regions (a to e) are divided and recognized among a plurality of luminance selection objects LSO1 to LSOn to adjust the luminance of the display device with luminance suitable for his/her visibility under ambient light. have.

The gradations of a plurality of predetermined levels corresponding to the plurality of gradation regions a to e may be low gradations. For example, as illustrated in Table 1, the gradation of the plurality of gradation regions a to e may be set to a low gradation of 90 gradation or less among 0 to 256 gradations. When a plurality of gradation regions (a to e) included in the plurality of luminance selection objects (LSO1 to LSOn) are displayed as low gradations, visibility can be recognized if each gradation region (a to e) can be recognized separately by the user. It can be judged that there is no problem.

In general, compared to the case of adjusting the brightness of the display device in the form of a bar, the proposed technology allows the user to check whether the gradation areas (a to e) are distinguished and recognized by the user, so that the brightness of the display device is suitable for the user Can be adjusted more accurately. When a user selects a luminance selection object having the lowest maximum luminance within a range in which the gradation regions (a to e) are divided and adjusts the luminance of the display device, the power consumption of the display device decreases and the image without distortion of the gradation to the user This can be provided.

Here, it is illustrated that each of the plurality of luminance selection objects LSO1 to LSOn is formed in a pattern of a circular target shape and is arranged in a line on the screen 210 of the display device. This is only an example, and the plurality of luminance selection objects LSO1 to LSOn are formed in an arbitrary pattern (ex, square, octagon, polygon, fan shape, etc.) that can be expressed by a plurality of predetermined levels of gradation. Can be. Also, the number of gradation regions included in the plurality of luminance selection objects LSO1 to LSOn is not limited. Further, the plurality of luminance selection objects LSO1 to LSOn may be displayed by being arranged in various arrangement structures on the screen 210 of the display device.

4 is an exemplary diagram illustrating a plurality of luminance selection objects displayed in a lock mode of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 4, when the display device is turned on or when it wakes up from the sleep mode, the display device operates in a lock mode and a lock release object 211 for unlocking the lock mode is displayed on the screen 210. Here, it is assumed that the unlocking object 211 is a type requiring input of a specific pattern specified by a user.

When the unlocking object 211 is displayed on the screen 210 of the display device, a plurality of brightness selection objects LSO1 to LSOn are displayed on the brightness selection area 216 on one side of the screen 210 of the display device. That is, a plurality of luminance selection objects LSO1 to LSOn are displayed on the screen 210 of the display device together with the unlocking object 211.

In this case, the user may adjust the luminance of the display device by selecting any one of the plurality of luminance selection objects LSO1 to LSOn in the process of releasing the lock mode. Since the brightness of the display device may be adjusted in the process of releasing the lock mode, the brightness of the display device may be adjusted in a situation in which even the unlocking object 211 is not properly visible to the user, such as outdoors in sunlight. The user's inconvenience due to the illuminance of the surrounding environment when releasing may be eliminated.

5 is a flowchart illustrating a method for adjusting luminance of a display device according to an exemplary embodiment of the present invention. The brightness adjustment method of the display device may be performed by the brightness adjustment device 100 described with reference to FIG. 1.

Referring to Figure 5, the luminance mode of the mobile device is confirmed (S110). A mobile device is a display device including a mobile phone, a PMP, a tablet PC, and a laptop, which have a display function and a touch function. The luminance mode can be confirmed from the mode information provided by the mobile device. The mode information may indicate one of a manual mode, an automatic mode and a lock mode.

It is determined whether the luminance mode of the mobile device is an automatic mode (S120). That is, it is determined whether the mode information indicates one of a manual mode, an automatic mode and a lock mode.

When the mode information does not indicate the automatic mode, a plurality of luminance selection objects are displayed (S130). That is, when the mode information indicates either the manual mode or the lock mode, a plurality of luminance selection objects are displayed. The luminance selection data for the plurality of luminance selection objects may be transmitted to the display device, and a plurality of luminance selection objects according to the luminance selection data may be displayed on the screen of the display device. When the display device is in the lock mode, a plurality of luminance selection objects may be displayed on the screen of the display device together with the unlocking object.

The plurality of luminance selection objects include patterns displayed in a plurality of predetermined levels of gradation based on different maximum luminances. Each of the plurality of luminance selection objects is divided into a plurality of gradation areas, and the plurality of gradation areas may correspond to a plurality of gradation levels.

If any one luminance selection object is selected by the user among a plurality of luminance selection objects displayed on the screen of the display device, manual luminance setting information corresponding to the selected luminance selection object is generated (S140). The manual luminance setting information may indicate a maximum luminance that is a reference of a luminance selection object selected from a plurality of luminance selection objects.

On the other hand, when the mode information indicates the automatic mode, the illuminance information is obtained (S150). The illuminance information represents the illuminance of the surrounding environment measured by the illuminance sensor.

Automatic luminance setting information corresponding to the illuminance information is generated (S160). The automatic luminance setting information may be set to increase the maximum luminance of the display device in proportion to the illuminance of the surrounding environment.

The maximum luminance is adjusted according to one of the manual luminance setting information and the automatic luminance setting information (S170). When the display device is in the lock mode, after the lock mode of the display device is released, the maximum luminance of the display device may be adjusted to the maximum luminance indicated by the manual luminance setting information. Alternatively, when the display device is in the lock mode, the maximum luminance of the display device may be adjusted to the maximum luminance indicated by the manual luminance setting information even before the display device is unlocked.

The drawings referenced so far and the detailed description of the described invention are merely exemplary of the present invention, which are used for the purpose of describing the present invention only and are used to limit the scope of the present invention as defined in the claims or the claims. It is not. Therefore, those of ordinary skill in the art will understand that various modifications and other equivalent embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: luminance adjustment device
110: mode check unit
120: manual luminance setting unit
130: automatic luminance setting unit
140: maximum brightness adjustment unit
200: display device
210: screen
211: unlock object
216: luminance selection area

Claims (20)

Luminance selection data for a plurality of luminance selection objects for manually adjusting the luminance of the display device is stored, and the luminance selection data is transmitted to the display device so that the plurality of luminance selection objects are displayed on the screen of the display device And a manual luminance setting unit generating manual luminance setting information corresponding to the luminance selection object selected from the plurality of luminance selection objects; And
And a maximum luminance adjusting unit that adjusts the maximum luminance of the display device according to the manual luminance setting information.
The plurality of luminance selection objects, the brightness adjustment device of the display device including a pattern that is displayed in a plurality of predetermined levels of gradation based on different maximum luminance. delete According to claim 1,
The manual luminance setting information is a luminance adjustment device of a display device indicating the maximum luminance that is the reference of the luminance selection object selected from the plurality of luminance selection objects. According to claim 3,
Each of the plurality of luminance selection objects,
A luminance adjustment device for a display device which is divided into a plurality of gradation regions, and wherein the plurality of gradation regions correspond to the gradations of the plurality of predetermined levels. According to claim 3,
When in a lock mode in which a lock release object is displayed on the screen, the manual luminance setting unit transmits the luminance selection data to the display device to display the luminance selection object together with the unlock object on the screen. Luminance adjustment device. The method of claim 5,
The maximum luminance adjusting unit adjusts the maximum luminance of the display device to the maximum luminance indicated by the manual luminance setting information after the lock mode is released. The method of claim 6,
A mode check unit for checking mode information indicating a mode for adjusting the brightness of the display device; And
A luminance adjusting device for a display device, further comprising an automatic luminance setting unit for obtaining luminance information to automatically adjust the luminance of the display device and generating automatic luminance setting information according to the luminance information. The method of claim 7,
The mode check unit transmits a manual mode indicator to the manual luminance setting unit when the mode information indicates a manual mode, and a display device to transmit a lock mode indicator to the manual luminance setting unit when the mode information indicates the lock mode. Brightness adjustment device. The method of claim 8,
The manual luminance setting unit may adjust the luminance of the display device to transmit the luminance selection data to the display device when either one of the manual mode indicator and the lock mode indicator is received. The method of claim 8,
When the mode information indicates the automatic mode, the mode confirmation unit transmits an automatic mode indicator to the automatic luminance setting unit,
The automatic luminance setting unit is the luminance adjustment device of the display device for generating the automatic luminance setting information when the automatic mode indicator is received. The method of claim 10,
The maximum brightness adjustment unit adjusts the brightness of the display device according to the automatic brightness setting information. Displaying a plurality of brightness selection objects for adjusting the brightness of the display device on the screen of the display device;
Generating manual luminance setting information corresponding to a luminance selection object selected from the plurality of luminance selection objects; And
And adjusting the maximum luminance of the display device according to the manual luminance setting information,
The plurality of luminance selection object is a brightness adjustment method of a display device including a pattern displayed in a plurality of predetermined levels of gradation based on different maximum luminance. delete The method of claim 12,
The manual luminance setting information is a luminance adjustment method of a display device indicating the maximum luminance that is the reference of the luminance selection object selected from the plurality of luminance selection objects. The method of claim 14,
Each of the plurality of luminance selection objects,
A method of adjusting luminance of a display device divided into a plurality of gradation regions, and wherein the plurality of gradation regions correspond to the gradations of the plurality of predetermined levels. The method of claim 14,
Checking mode information indicating a mode for adjusting the luminance of the display device; And
And determining whether the mode information indicates one of a manual mode, a lock mode, and an automatic mode,
When the mode information indicates one of the manual mode and the lock mode, the plurality of luminance selection objects are displayed on the screen of the display device, the brightness adjustment method of the display device. The method of claim 16,
The step of displaying a plurality of luminance selection objects for adjusting the luminance of the display device on the screen of the display device,
And when the mode information indicates the lock mode, displaying the plurality of luminance selection objects on the screen of the display device together with the unlocking object. The method of claim 17,
After displaying the luminance selection object together with the unlocking object on a screen of the display device, when the lock mode is released, the maximum luminance of the display device is the maximum luminance that is the reference of the luminance selection object selected from the plurality of luminance selection objects. And adjusting the luminance of the display device. The method of claim 16,
And when the mode information indicates the automatic mode, measuring the illuminance of the surrounding environment of the display device to obtain illuminance information, and generating automatic luminance setting information corresponding to the illuminance information. How to adjust. The method of claim 19,
And adjusting the maximum luminance of the display device according to the automatic luminance setting information.

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