JP2010256460A - Liquid crystal display device, on-vehicle equipment, display control method of liquid crystal display device and control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which operability of operation keys is maintained without depending on an inclination angle of an image display surface, on-vehicle equipment, an image display method of the liquid crystal display device and a control program. <P>SOLUTION: The liquid crystal display device 1 is provided with: a liquid crystal panel 11 which has a touch panel 13 arranged on the image display surface 11a and can operate an operation key 14 displayed on the image display surface 11a via the touch panel 13; a support part 21 which supports the liquid crystal panel 11 so that a support angle can be varied; an angle detection part 23 which detects the inclination angle of the image display surface 11a; and a display control part 26 which changes a display form of the operation key 14 according to a change in the inclination angle. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device in which an operation panel is disposed on an image display surface of a liquid crystal display panel, an in-vehicle device, a display control method for the liquid crystal display device, and a control program.

  2. Description of the Related Art Conventionally, a display device that is mounted on a vehicle and provided in an in-vehicle device is known in which the angle of an image display surface can be tilted (see, for example, Patent Document 1). As this type of display device, a liquid crystal display device is mainly used. In many of this type of liquid crystal display device, a touch panel is provided on the image display surface, and various operation keys displayed on the image display surface are operated via the touch panel to provide various types of in-vehicle devices. The function can be operated.

JP 2002-347476 A

However, in general, the viewing angle of a liquid crystal panel is often narrower than other displays such as an organic EL display. For this reason, when the angle of the image display surface is tilted, the visibility of the image display surface decreases due to the positional relationship with the user's viewpoint, and it becomes difficult for the user to touch the display location of the operation keys correctly. In some cases, the sexiness decreased.
An object of the present invention is to provide a liquid crystal display device, an in-vehicle device, an image display method for a liquid crystal display device, and a control program capable of maintaining the operability of operation keys regardless of the inclination angle of the image display surface. .

In order to solve the above problems, a first aspect of the present invention is a liquid crystal panel in which a touch panel is disposed on an image display surface, and an operation key displayed on the image display surface can be operated via the touch panel; A support unit that supports the liquid crystal panel in a variable support angle; an angle detection unit that detects an inclination angle of the image display surface; and a display control unit that changes a display form of the operation keys in accordance with a change in the inclination angle. And a liquid crystal display device comprising:
According to the above configuration, when the support angle of the liquid crystal panel changes, the display control unit moves the display location of the operation key on the image display surface via the touch panel according to the change in the tilt angle of the image display surface. By changing the display form of the operation key to a display form that can be touched correctly, the visibility of the operation key can be maintained and the operability of the operation key can be maintained.
As such a display form, for example, the display size of the operation key, the display position of the operation key, and the like can be cited.

According to a second aspect of the present invention, in the first aspect, the display control unit changes a display size of the operation key as the display form according to a change in the tilt angle. .
According to the above configuration, according to the change in the inclination angle of the image display surface by the display control unit, for example, when the visibility of the image display surface decreases, The visibility of the operation keys can be maintained, and the operability of the operation keys can be maintained.

In addition, according to a third aspect of the present invention, in the first aspect or the second aspect, the display control unit changes a display position of the operation key as the display form according to a change in the tilt angle. It is characterized by.
According to the above configuration, when the visibility of the image display surface is reduced by the display control unit in accordance with the change in the tilt angle of the image display surface, for example, the image is displayed on the side or lower part of the image display surface. The operation key display position is changed to a position that is easy for the user to visually recognize, such as the center of the image display surface, or a position where the operation key is easy to operate, so that the operability of the operation key is maintained. Can do.

According to a fourth aspect of the present invention, in the aspect according to any one of the first to third aspects, the image display surface is supported at a predetermined reference angle by the support portion, and the operation key is displayed. As the form, a reference display form at the reference angle is determined in advance, and the display control unit determines whether the operation key is in accordance with a difference between the inclination angle detected by the angle detection unit and the reference angle. The display form is changed from the reference display form.
According to the above configuration, when the image display surface is supported at a predetermined reference angle, depending on the difference between the inclination angle of the image display surface and the reference angle, the visibility of the image display surface decreases. The operability of the operation keys can be maintained by changing the display form of the operation keys from the reference display form.

  In order to achieve the above object, a fifth aspect of the present invention provides an in-vehicle device comprising the liquid crystal display device according to any one of the first to fourth aspects.

  In order to achieve the above object, according to the sixth aspect of the present invention, a touch panel is disposed so as to overlap the image display surface, and the operation keys displayed on the image display surface can be operated via the touch panel. A display control method for a liquid crystal display device, comprising: a liquid crystal panel; a support unit that supports the liquid crystal panel with a variable support angle; and an angle detection unit that detects an inclination angle of the image display surface. Providing a display control method for a liquid crystal display device, comprising: a step of detecting a tilt angle of an image display surface by a step; and a step of changing a display form of the operation keys according to a change in the tilt angle. To do.

  In order to achieve the above object, according to the seventh aspect of the present invention, a touch panel is disposed on the image display surface so that the operation keys displayed on the image display surface can be operated via the touch panel. A liquid crystal display comprising: a liquid crystal panel; a support unit that supports the liquid crystal panel with a variable support angle; an angle detection unit that detects an inclination angle of the image display surface; and an angle detection unit that detects an inclination angle of the image display surface. A control program for controlling an apparatus using a computer, wherein the angle detection unit detects an inclination angle of an image display surface, and changes a display form of the operation keys according to a change in the inclination angle. It is characterized by this.

  According to the present invention, it is possible to maintain the operability of the operation keys by changing the display form of the operation keys in accordance with the change in the inclination angle of the image display surface.

It is the figure which showed simply the external appearance structure of the liquid crystal display device of this Embodiment. It is the figure which showed the example of a display of an operation key. It is a schematic block diagram of the liquid crystal display device of the present embodiment. It is the graph which illustrated display setting information. It is a processing flowchart of this Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration of a liquid crystal display device 1 of the present embodiment. In the present embodiment, the liquid crystal display device 1 provided in the in-vehicle device 100 will be described as an example. As shown in FIG. 1, the liquid crystal display device 1 includes a display unit 10 having a liquid crystal panel 11 and a main body unit 20. The main body 20 is arranged in a dashboard of a vehicle (not shown), and the display unit 10 is arranged on the front side of the dashboard. A touch panel 13 is disposed on the image display surface 11a of the liquid crystal panel 11 so as to cover the entire surface. Further, the liquid crystal panel 11 is supported with respect to the main body portion 20 by a slide mechanism 21 as a support portion so that the support angle is variable.

  As shown in FIGS. 1A to 1C, the slide mechanism 21 includes a slide bar 21 a provided at the lower end portion of the main body portion 20, and a rotation supporting the lower end of the liquid crystal panel 11 provided at one end of the slide bar 21 a. And a moving part 21b.

  The length of the slide bar 21a can be expanded and contracted in the horizontal direction (arrow FR direction). By moving the slide bar 21a in the direction of arrow F in the figure and extending its length, the closed position (= inclination angle θa) shown in FIG. 1 (a) is used as the reference position (= reference angle θa). The liquid crystal panel 11 is moved in the horizontal direction from the position to the open position (= inclination angle θc) shown in FIG.

  The rotating portion 21b supports the lower end of the liquid crystal panel 11 and rotates in a state where the liquid crystal panel 11 is supported around the rotation axis, thereby changing its posture to a closed position (= inclination angle θa) shown in FIG. ) To the open position (= inclination angle θc) shown in FIG. By controlling the extension of the slide bar 21a and the rotation of the rotating portion 21b, the angle of the image display surface 11a of the liquid crystal panel 11 is set as shown in FIG. It can be tilted to a desired angle.

  Further, the liquid crystal panel 11 is moved in the arrow R direction with the liquid crystal panel 11 in the open position shown in FIG. 1C with the posture of the liquid crystal panel 11 substantially parallel to the slide bar 21a. Can be stored in a display storage section (not shown) provided in the main body section 20.

Next, a display example of the operation keys 14 displayed on the image display surface 11a will be described with reference to FIG.
As shown in FIG. 2A, various operation keys 14 are displayed on the image display surface 11 a of the liquid crystal panel 11. As will be described later, in-vehicle device 100 according to the present embodiment is connected to a DVD playback device capable of playing back a DVD (Digital Versatile Disk), and executes playback of the DVD as the operation mode to the connected DVD playback device. DVD playback mode is provided. FIG. 2 shows an example in which the operation screen in the DVD playback mode is displayed on the image display surface 11a.
In the operation screen shown in FIG. 2A, an operation key 14a for instructing display of a setting screen for performing various settings in reproduction of a DVD, and display of an additional setting screen for performing additional settings for reproduction of the DVD. Various operation keys 14 corresponding to various operation modes are displayed, such as an operation key 14b for instructing the operation and an operation key 14c for instructing the start of DVD playback. The user can cause the in-vehicle device 100 to execute the operation content associated with these operation keys 14 by touching these operation keys 14 via the touch panel 13 disposed on the image display surface 11a. .

  By the way, in the liquid crystal display device 1 mounted on the vehicle, generally, the viewing angle of the liquid crystal panel 11 is often narrower than that of a home TV or the like, and also compared with other display devices such as the liquid crystal panel 11 itself and an organic EL display. Then the viewing angle is narrow. When the angle of the image display surface 11a is inclined, depending on the positional relationship with the user's viewpoint, the entire image display surface 11a may be viewed as blackish or may be viewed as whitened. As described above, when the visibility of the image display surface 11a is reduced due to the change in the angle of the image display surface 11a, the visibility of the operation keys 14 displayed on the image display surface 11a is also reduced. As a result, the user cannot correctly recognize the position where the operation key 14 is displayed, and it may be difficult to correctly touch the area where the operation key 14 is displayed.

As shown in FIG. 1A, when the user touches the image display surface 11a via the touch panel 13 from a direction substantially perpendicular to the image display surface 11a at the closed position, the user moves the finger f. Thus, the location f1 where the touch panel 13 is actually touched and the location f2 recognized as touched by the user on the image display surface 11a are substantially the same coordinate position.
On the other hand, for example, as shown in FIGS. 1B and 1C, when the user touches the touch panel 13 with the finger f from the same direction as the closed position when the image display surface 11a is inclined, the user The location f1 where the touch panel 13 is actually touched is different from the location f2 where the user recognizes that the user touches the image display surface 11a, and it is difficult for the user to touch the position where the operation key 14 is displayed correctly. There is a case.
In particular, in the liquid crystal display device 1 arranged in a narrow space such as a vehicle, the direction in which the user views the image display surface 11a is constant, and the user touches the image display surface 11a via the touch panel 13 or the like. The direction of the operated medium is substantially constant. Therefore, if the display form of the operation key 14 is not changed according to the inclination of the image display surface 11a, it becomes difficult for the user to correctly touch the place where the operation key 14 is displayed, and the operability is lowered. .

  Therefore, in the liquid crystal display device 1 of the present embodiment, when the posture of the liquid crystal panel 11 is tilted from the closed position to the open position, the user places the display location on the image display surface 11a of the operation keys 14 via the touch panel 13. The display form of the operation key 14 is changed so that the display size of the operation key 14 is automatically enlarged. By greatly changing the display size of the operation key 14 according to the inclination of the image display surface 11a, the visibility of the operation key 14 is maintained, and the position touched on the touch panel 13 by the user is determined by the user. It can be included in the display area of the operation keys 14 displayed on 11a.

  Next, with reference to FIG. 3, a functional configuration according to a main part of the liquid crystal display device 1 will be described. As shown in FIG. 3, the liquid crystal display device 1 includes the display unit 10 and the main body unit 20 described above. The display unit 10 includes a liquid crystal panel 11 and a signal processing unit 12. The main body 20 includes a slide mechanism 21, a slide mechanism drive unit 22, an angle detection unit 23, an operation unit 24 having a touch panel 13, a memory unit 25, and a microcomputer 26 as a display control unit. .

The signal processing unit 12 has a function of performing signal processing on an image signal input from an image signal source such as a DVD playback device (not shown) and outputting the image signal after the signal processing to the liquid crystal panel 11. As the image signal source, various image signal sources such as a TV tuner and a CD (Compact Disc) playback device can be applied in addition to the above-described DVD playback device. The liquid crystal display device 1 is configured to be able to input image signals from various image signal sources such as a DVD playback device, a TV tuner, and a CD playback device.
Further, the signal processing unit 12 is used for an operation screen for displaying various operation keys 14 for performing various operations on various devices serving as the image signal source and setting the image quality of the liquid crystal display device 1 itself. An image signal is input. When an image signal for the operation screen is input, the signal processing unit 12 refers to display setting information described later, and the display size of the operation key 14 is the image of the liquid crystal panel 11 based on a control signal input from the microcomputer 26. Signal processing is performed on the image signal so as to obtain a predetermined display size corresponding to the inclination angle of the display surface 11a. The image signal after the signal processing is output to the liquid crystal panel 11.

  The slide mechanism 21 includes a drive motor and the like in addition to the slide bar 21a and the rotation unit 21b described above. The drive motor includes a horizontal drive motor for moving the slide bar 21a in the horizontal direction and a rotation motor for rotating the rotation unit 21b.

  The slide mechanism drive unit 22 has an image display surface 11a of the liquid crystal panel 11 at an angle desired by the user when a user gives an instruction to tilt (change) the attitude of the liquid crystal panel 11 based on a control signal input from the microcomputer 26. As described above, the drive control of the horizontal drive motor and the rotation motor is performed, and the attitude and position of the liquid crystal panel 11 are controlled. Further, when there is an instruction to store the liquid crystal panel 11 from the user via the operation unit 24, the extension operation of the slide bar 21 a and the operation of the liquid crystal panel 11 are performed so that the liquid crystal panel 11 is stored in the display storage unit of the main body unit 20. Controls the turning motion.

  The angle detector 23 detects the inclination angle of the image display surface 11 a of the liquid crystal panel 11. Here, in the present embodiment, the inclination angle of the image display surface 11a of the liquid crystal panel 11 is detected as the angle of the image display surface 11a with respect to the slide bar 21a. For example, in the case shown in FIG. 1 (a), the inclination angle is θa, in the case shown in FIG. 1 (b), the inclination angle is θb, and in the case shown in FIG. 1 (c), the inclination angle is θc. Therefore, the inclination angle of the image display surface 11a decreases from θa in the order of θb and θc, and the inclination angle of the image display surface 11a becomes smaller as the inclination of the image display surface 11a increases.

  The operation unit 24 receives various operation instructions from the user and outputs an instruction signal corresponding to the operation instruction to the microcomputer 26 and includes the touch panel 13 described above. Various operation keys 14 are displayed on the image display surface 11a according to the various operation modes described above. When the user touches the display location of the operation key 14 with a finger or the like via the touch panel 13, a signal indicating the coordinate position on the image display surface 11a associated with the coordinate position on the touch panel 13 touched by the user is displayed. Input to the microcomputer 26. When such a signal is input, the microcomputer 26 performs a touch operation on which operation key 14 is compared with the coordinate position on the image display surface 11a on which various operation keys 14 displayed on the liquid crystal panel 11 are displayed. The liquid crystal display device 1 is made to execute the operation content associated with the touched operation key 14. The user can perform various operations such as tilting the posture of the liquid crystal panel 11 and playing a DVD by touching the operation keys 14 displayed on the image display surface 11a via the touch panel 13.

The memory unit 25 includes an SRAM (Static Ram), an SDRAM (Synchronous DRAM), a Flash RAM, and the like, and stores display setting information for adjusting the display form of the operation keys 14 according to the inclination angle of the image display surface 11a. The display setting information storage area 25a is stored.
Here, FIG. 4 shows the display size of the operation key 14 corresponding to each inclination angle of the image display surface 11a. As shown in FIG. 4, in the present embodiment, the display angle of the operation key 14 at the close position is the first reference size Sa (reference size), with the inclination angle θa at the close position as the reference angle. The display size of the operation keys 14 is increased by a predetermined ratio according to the difference between the reference angle (= tilt angle θa) and the tilt angle of the image display surface 11a. It is set in the display setting information.
That is, each time the tilt angle changes “1 degree”, the ratio of the change in the display size of the operation key 14 is expressed by a constant “a”, which is an intermediate position between the closed position and the open position (FIG. 1B). The display size Sb of the operation key 14 in () can be expressed by the following formula (1).
Sb = a × (θa−θb) + Sa (1)
That is, if the display size of the operation key 14 at the open position (= inclination angle θc) is the second reference size Sc, the display size of the operation key 14 at the intermediate position takes a value in the range of Sa <Sb <Sc, As the difference between the inclination angle of the image display surface 11a and the reference angle is increased, the display size of the operation keys 14 is changed.
The first reference size Sa and the second reference size Sc maintain the user operability by placing the liquid crystal display device 1 in a predetermined position such as a dashboard of a vehicle in advance and conducting an experiment or the like. It is set to a size that can be used. Maintaining operability means that a user can visually recognize a predetermined operation key 14 displayed on the image display surface 11a from a predetermined direction in the vehicle and touches the predetermined operation key 14 via the touch panel 13. In this case, the position of the operation key 14 is set so that the position on the touch panel 13 actually touched by the user is a display size included in the display area of the predetermined operation key 14 displayed on the image display surface 11a. The size is set. Usually, when many users touch the operation key 14, they touch the inside of the operation key display area. Therefore, when the user operates the operation key 14, an area with a high probability of being touched by the user on the touch panel 13 when viewed from the user's viewing direction is included in the display area of the operation key 14 on the image display surface 11a. The display size is set.

  The memory unit 25 has function information such as the graph shown in FIG. 4 for changing the display size of the operation key 14 in accordance with the change in the tilt angle of the image display surface 11a as the display setting information. Alternatively, an association table in which the display sizes of the operation keys 14 corresponding to each angle are associated with each tilt angle that the liquid crystal panel 11 can take may be held as display setting information.

  The microcomputer 26 is a microprocessor that controls the entire liquid crystal display device 1 and includes a CPU, a RAM, a ROM, and the like (not shown). The microcomputer 26 controls the display and the posture and position of the liquid crystal panel 11 by the CPU using a part of the RAM as a work area based on the control program and control data stored in advance in the ROM. The display size changing process of the operation key 14 is performed based on the display setting information.

Next, with reference to FIG. 5, the operation | movement which concerns on the display size change process of the liquid crystal display device 1 in this Embodiment is demonstrated. However, the reference position of the liquid crystal panel 11 is a closed position.
As shown in FIG. 5, first, the liquid crystal display device 1 stands by until an inclination instruction for the posture of the image display surface 11a is input via the operation unit 24 (step S1). When a tilt instruction for the image display surface 11a is input to the microcomputer 26 via the operation unit 24 (step S1; Y), the microcomputer 26 controls the slide mechanism driving unit 22 to display the liquid crystal panel 11 in FIG. The inclination process of the liquid crystal panel 11 is executed so as to be inclined from the reference position shown in FIG. When the liquid crystal panel 11 is tilted to the tilt angle specified by the user (step S3), the control unit then causes the angle detection unit 23 to detect the tilt angle of the image display surface 11a (step S4). Next, the display setting information stored in the memory unit 25 is read, and the display size of the operation key 14 is changed so as to be a predetermined display size corresponding to the tilt angle detected in step S4 (step S5).

As described above, according to the above-described embodiment, when the support angle of the liquid crystal panel 11 is changed, the microcomputer 26 allows the user to change the tilt angle of the image display surface 11a according to the change of the tilt angle of the image display surface 11a. By increasing the display size of the operation key 14 so that the upper display portion can be correctly touched via the touch panel 13, the visibility of the operation key 14 can be maintained and the operability can be maintained.
At this time, in the above embodiment, the display size of the operation key 14 on the image display surface 11a is such that when the user operates the operation key 14, the portion on the touch panel 13 that is likely to be touched by the user is the image display surface. The display size is set to be included in the display area of the operation key 14 on 11a. From such a viewpoint, when the image display surface 11a is tilted, the display size of the operation key 14 is displayed to be large, so that user operability can be maintained and erroneous operation can be prevented.

The above-described embodiment is one aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, the display size of the operation key 14 is the smallest when the orientation of the liquid crystal panel 11 is the closed position, and the display size of the operation key 14 is the smallest when the orientation of the liquid crystal panel 11 is the open position. The display size of the operation key 14 is linearly changed according to the inclination angle of the image display surface 11a so as to increase, but the mode of changing the display size is not limited to this. Considering the visibility of the image display surface 11a at each inclination angle and the operability of the operation key 14, the display size of the operation key 14 is changed to a predetermined size that can maintain the operability for the user at each inclination angle. Can do.
In the above-described embodiment, the reference posture of the liquid crystal panel 11 is the closed position, and the reference angle = θa has been described. However, the reference angle can be an arbitrary angle, for example, as illustrated in FIG. The inclination angle θb of the image display surface at an intermediate position between the closed position and the open position shown may be used as the reference angle. However, the image quality is set so that the visibility of the image display surface 11a at the reference angle is the highest depending on the positional relationship with the user's viewpoint, and when the image display surface 11a is inclined from the reference angle, It is assumed that the visibility of the image display surface 11a is lowered due to the positional relationship. Also in this case, the display form of the operation key 14 may be changed according to the difference between the reference angle θb and the inclination angle.

Moreover, although the said embodiment demonstrated the example which changes the display size of the operation key 14 as a display form of the operation key 14 according to the change of the inclination angle of the image display surface 11a, it is limited to this. is not. For example, the display position of the operation key 14 may be changed as the display form of the operation key 14 in accordance with the change in the tilt angle of the image display surface 11a. In the example shown in FIG. 2, an operation key 14a for instructing display of a setting screen for performing various settings is displayed on the upper right side toward the image display surface 11a. When the image display surface 11a is tilted and the visibility of the operation key 14a is lowered, the display position of the operation key 14a may be displayed at the center of the image display surface 11a. As described above, even when the display position of the operation key 14a is moved to a position that is easy for the user to operate, the image display surface 11a is inclined and the visibility of the image display surface 11a is lowered. Operability can be maintained.
Further, as a display form of the operation keys 14 according to the tilt angle of the image display surface 11a, the display size and the display position may be changed to the display size and the display position associated with each tilt angle. It is. Furthermore, in the above embodiment, as shown in FIGS. 2A and 2B, when the display size of the operation key 14 is changed, both the horizontal width and height of the operation key 14 are greatly changed. Only one of them may be changed according to the inclination of the image display surface 11a. That is, when the image display surface 11a is inclined, the position touched on the touch panel 13 by the user is included in the display area of the operation key 14 displayed on the image display surface 11a when viewed from the direction visually recognized by the user. It should be changed as follows.
In the above-described embodiment, the operation key 14 associated with predetermined operation content for the in-vehicle device 100 is taken as an example of the operation key 14, but GUI (Graphical User Interface) is also included in the concept of the operation key. That is, the GUI display form (display size, display position, etc.) may be changed according to the inclination angle of the image display surface 11a.

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 10 Display part 11 Liquid crystal panel 11a Image display surface 12 Signal processing part 13 Touch panel 14, 14a, 14b, 14c Operation key 21 Slide mechanism (support part)
21b Rotating unit 23 Angle detecting unit 26 Microcomputer (display control unit)
θa, θb, θc Inclination angle θa Reference angle Sa Reference size

Claims (7)

A liquid crystal panel in which a touch panel is disposed on the image display surface and the operation keys displayed on the image display surface can be operated via the touch panel;
A support portion for supporting the liquid crystal panel in a variable support angle;
An angle detector for detecting an inclination angle of the image display surface;
A display control unit that changes a display form of the operation keys in accordance with a change in the tilt angle;
A liquid crystal display device comprising: The liquid crystal display device according to claim 1.
The display control unit changes a display size of the operation key as the display form according to a change in the tilt angle.
A liquid crystal display device. The liquid crystal display device according to claim 1 or 2,
The display control unit changes a display position of the operation key as the display form according to a change in the tilt angle.
A liquid crystal display device. The liquid crystal display device according to any one of claims 1 to 3,
The image display surface is supported at a predetermined reference angle by the support part,
As the display form of the operation keys, a reference display form at the reference angle is predetermined,
The display control unit changes a display form of the operation keys from the reference display form according to a difference between the inclination angle detected by the angle detection unit and the reference angle,
A liquid crystal display device. Comprising the liquid crystal display device according to any one of claims 1 to 4;
In-vehicle equipment characterized by A liquid crystal panel in which a touch panel is disposed on the image display surface, the operation keys displayed on the image display surface can be operated via the touch panel, and a support unit that supports the liquid crystal panel with a variable support angle; A display control method for a liquid crystal display device comprising an angle detection unit for detecting an inclination angle of the image display surface,
A process of detecting an inclination angle of the image display surface by the angle detector;
Changing the display form of the operation keys according to the change in the tilt angle;
A display control method for a liquid crystal display device. A liquid crystal panel in which a touch panel is disposed on the image display surface, the operation keys displayed on the image display surface can be operated via the touch panel, and a support unit that supports the liquid crystal panel with a variable support angle; An angle detection unit for detecting an inclination angle of the image display surface, a control program for controlling a liquid crystal display device including an angle detection unit for detecting an inclination angle of the image display surface using a computer,
Let the angle detection unit detect the tilt angle of the image display surface,
Changing the display form of the operation keys in accordance with the change in the tilt angle;
A control program characterized by

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