JP3875646B2 - 4-split key-top switch, input device, mobile phone terminal using this - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a four-part key top switch, an input device, and a mobile phone terminal using the same.
[0002]
[Prior art]
Referring to FIG. 16, this is a perspective view of a mobile phone terminal which is an electronic device. The cellular phone terminal 1 is roughly composed of a display unit 11 composed of a liquid crystal display device and an input unit 12 having a push button or a keyboard (see Patent Document 1). The input unit 12 generally comprises a key top input device. The cellular phone terminal 1 is used in an upright left side state as shown in the figure. If the posture is changed to the overturned state shown on the right side, the key top input device constituting the input unit 12 becomes extremely difficult to use because the display content of the key top falls down. If the electronic device is the mobile phone terminal 1, the display content of the liquid crystal display screen of the liquid crystal display device constituting the display unit 11 also falls down and is difficult to see.
[0003]
Many of the display units 11 of the mobile phone terminal 1 have a rectangular display screen and have different aspect ratios. Normally, the longer side of the display screen is in the vertical direction and the shorter side is in the horizontal direction. Depending on the contents of the displayed information, there may be a case where the user wants to improve usability by reversing the vertical and horizontal directions of the display screen.
In view of the above, a cellular phone terminal 1 that switches the display content of the display screen between vertical and horizontal has also been developed.
[0004]
However, in order to switch the display content of the display screen in the opposite direction, it is usually necessary to operate a switching button provided in the input unit 12. In view of this, a mobile phone terminal 1 that automatically switches between vertical and horizontal switching has been developed, and this is performed by linking to a specific function via the Internet to execute automatic switching. Depending on your attitude, it may be difficult to use. Furthermore, since the arrangement of the push buttons of the input unit 12 or the input keys of the keyboard is fixed, when the posture is changed, it is usually impossible to perform operations other than the operation of the icons on the display screen.
[0005]
Further, the structure of the conventional mobile phone terminal 1 has the display unit 11 arranged at the upper part and the input unit 12 arranged at the lower part, so that the upper display unit 11 cannot be gripped during the information input operation. Further, it is necessary to perform an input operation with a finger bent deeply, and it is difficult for a person with a large hand or an elderly person to operate.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-290529
[Problems to be solved by the invention]
Here, the present invention provides a four-part key top input device that facilitates an input operation by changing the orientation of the key top display in response to this change even when the posture of holding an electronic device such as a mobile phone terminal changes. A four-part key top switch constituting the four-part key top input device, and a cellular phone terminal that uses the four-part key top input device in an electronic device to facilitate reading of display on the display unit and input operation on the input unit Is to provide.
[0008]
[Means for Solving the Problems]
Claim 1: It has a four-part key top 121 that is divided into four 90 ° opaquely by a separator 121 s. Each part of the four-part key top 121 displays numbers and other symbols, and a switch in the center. It has a printed circuit board 122 in which the contact portion 123 is positioned and fixed, and the LED 124 is positioned and fixed facing the respective codes of the four-divided key top 121. The printed circuit board 122 has a gravity detection sensor. A four-part key top switch is configured in which one is selectively driven and the switch contact portion is in an input waiting state.
[0009]
According to a second aspect of the present invention, there is provided an input device for an electronic device having a display unit 11 and an input unit 12, comprising an input unit having three or four matrix elements each having a four-part key top switch, and each address of the matrix The four-divided key top switch has a four-divided key top 121 that is divided into four 90 ° opaquely by a separator 121s, and each divided portion of the four-divided key top 121 has a numeral or other code. The switch contact portion 123 is positioned and fixed at the center, the printed circuit board 122 is positioned and fixed facing the respective codes of the four-part key top 121, the gravity detection sensor is provided, and the gravity detection sensor One of the LEDs is selectively driven based on the detection output, and the switch contact portion is in an input waiting state.
[0010]
Further, in the input device according to claim 2, the input unit includes a basic posture in which a sign displayed on each divided portion of the four-part key top 121 is upright, and the basic posture is 90 ° clockwise. Each of the postures includes a rotated 90 ° rotation posture, a 180 ° rotation posture in which the basic posture is rotated 180 ° clockwise, and a 270 ° rotation posture in which the basic posture is rotated 270 ° clockwise. An input device is configured in which numerals and other codes are arranged in each divided part of the four-part key top of the common address of the matrix.
[0011]
Here, the present invention includes an input display unit control circuit unit 2 that controls the display unit 11 and the input unit 12, and the input display unit control circuit unit 2 includes an attitude determination unit 21, a display direction determination unit 23, and a display drive circuit. Here, the posture determination unit 21 determines the posture of the electronic device based on the detection signal supplied from the acceleration sensor 3, and the display direction determination unit 23 is a posture signal that is a determination result of the posture determination unit 21. Is directly input to determine the display direction signal corresponding thereto, and the display driving circuit 24 inputs the display direction signal output from the display direction determining unit 23 and displays the display unit 11 and the input unit 12 in the directions corresponding thereto. The input display unit control circuit unit 2 further includes a posture storage unit 22 that temporarily stores the posture signal that is the determination result of the posture determination unit 21, and the posture signal immediately before being stored in the posture storage unit 22 The determination result of the posture determination unit 21 Inputs the current attitude signal is constituted the mobile phone to determine the display direction signal corresponding thereto on the basis of these two signals.
[0012]
The four- part key top switch having three or four matrix elements each having the four- part key top switch as an element and arranged at each address of the matrix is made 90 ° opaque to each other by the separator 121s. The four-part key top 121 has a four-part key top 121. Each part of the four-part key top 121 displays numbers and other symbols, and the switch contact part 123 is positioned and fixed at the center part. There is a printed circuit board 122 in which the LED 124 is positioned and fixed facing each code, and one of the LEDs is selectively driven based on a detection signal supplied from the acceleration sensor 3, and the switch contact portion is in an input waiting state. A mobile phone terminal consisting of a key top switch was constructed.
[0013]
Furthermore, according to claim 5 in the mobile phone terminal as claimed in claim 4, a basic attitude that code has been erected to be displayed on the surface of each of the divided portions of the input section 12 is divided into four key tops 121, watch basic attitude 90 ° rotation posture rotated 90 ° in the direction, 180 ° rotation posture rotated the basic posture 180 ° clockwise, and 270 ° rotation posture rotated the basic posture 270 ° clockwise, A mobile phone terminal is configured in which numbers and other codes are arranged in each divided part of the four-part key top of a common address of the matrix in each posture.
Further, according to claim 6 in the mobile telephone terminal as claimed in claim 4 or 5, the display unit 11 consists of a liquid crystal display device, the display of the display screen by the input from the display direction determining unit attitude signal corresponding to the direction of gravity A mobile phone terminal that rotates the direction of the display image by converting the addresses R and C is configured.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
Reference is first made to FIG. 1, which is a block diagram of an embodiment. Reference numeral 2 denotes an entire input display unit control circuit unit for controlling the display unit 11 and the input unit 12. The input display unit control circuit unit 2 includes an attitude determination unit 21, an attitude storage unit 22, a display direction determination unit 23, and a display drive circuit 24.
Here, the input unit 12 is operated, and the posture determination function necessity input is supplied from the mobile phone terminal 1 to the posture determination unit 21. When the posture determination function required input is supplied, the posture determination unit 21 is activated and the input display unit control circuit unit 2 starts the determination operation. If the posture determination function non-input is supplied, the posture determination unit 21 does not start, and the input display unit control circuit unit 2 does not perform the determination operation, so that the mobile phone terminal 1 operates as a simple normal mobile phone terminal.
[0015]
The posture determination unit 21 determines the posture of the mobile phone terminal 1 based on the detection signal supplied from the acceleration sensor 3.
The display direction determination unit 23 directly inputs a posture signal that is a determination result of the posture determination unit 21 and determines a display direction signal indicating an appropriate display direction corresponding to the posture signal.
The display drive circuit 24 receives the display direction signal output from the display direction determination unit 23, and drives and changes the display unit 11 and the input unit in a direction corresponding to the display direction signal.
The posture storage unit 22 is a storage unit that temporarily stores a posture signal that is a determination result of the posture determination unit 21. As will be described in detail later, the display direction determination unit 23 inputs the posture signal immediately before being temporarily stored in the posture storage unit 22 and the current posture signal that is the determination result of the posture determination unit 21, Based on these two signals, an appropriate display direction signal corresponding to the two signals is determined.
[0016]
Referring to FIG. 2, this is substantially the same as the embodiment of FIG. 1 in which an amplifier, a zero adjustment unit 3 'and an interface circuit 25 are further added to the embodiment of FIG. The amplification and zero point adjustment unit 3 ′ constitutes a part of the acceleration sensor 3, and adjusts the gain of the acceleration sensor 3 in advance and adjusts the deviation of the zero point before use.
Referring to FIG. 3, this is a perspective view conceptually illustrating the embodiment.
FIG. 3A shows a state where the posture of the mobile phone terminal 1 is in a normal posture. FIG. 3B shows a posture in which the posture of the mobile phone terminal 1 is turned 180 ° from the posture of FIG. However, even when the cellular phone terminal 1 in FIG. 3B is in a fallen posture, the display screen display of the display unit 11 does not fall down and is erected in the normal direction according to the present invention. Also for the input unit 12, the numerical arrangement of the key tops has a normal normal arrangement. FIG. 3C shows a posture in which the posture of the mobile phone terminal 1 is rotated 90 degrees from the posture of FIG. However, even when the mobile phone terminal 1 in FIG. 3C is in a rollover posture, the display on the display screen of the display unit 11 does not roll over and stands upright in the normal direction according to the present invention. Also for the input unit 12, the numerical arrangement of the key tops has a normal normal arrangement.
[0017]
Referring to FIG. 4, this is an embodiment that is substantially equivalent to the embodiment of FIG.
In the case of FIG. 4A, compared with FIG. 3A, the installation positions of the display unit 11 and the input unit 12 are turned upside down, the display unit 11 is arranged on the lower side, and the input unit 12 is on the upper side. Has been placed. When the hand is particularly large and a large part of the mobile phone terminal 1 is fit in the palm, the positional relationship in FIG. 4A facilitates the operation of the input unit 12 with the thumb. FIG. 4B shows a posture in which the posture of the mobile phone terminal 1 is turned 180 ° from the posture of FIG. Thereby, it can be set as the attitude | position of FIG.4 (b). FIG. 4C shows a posture in which the posture of the mobile phone terminal 1 is rotated 90 degrees from the posture of FIG.
[0018]
Referring to FIG. 5, this is a diagram for explaining an embodiment of a 4-split key top switch used for a mobile phone terminal. FIG. 5A is a diagram showing a quadrant key top divided into four. FIG. 5 (b) is a diagram showing the posture “a”, posture “b”, posture “c”, and posture “d” of the mobile phone terminal using the four-part key top switch in order from the left. FIG. 5C is an exploded view of the 4-split key top switch.
The 4-split key top 121 is divided into 90 ° by the separator 121s so as to be opaque to each other, and the numbers {circle over (1)}, {circle over (3)}, {9}, {7} are as shown on the surface of each split portion. Displayed as shown. This display method will be described later. Here, the four-divided key top switch having the four-divided four-divided key tops 121 is arranged in one row and one column of the input unit 12 of the mobile phone terminal 1 in the posture (a) in FIG. The number (1) is displayed upright in the column. Next, when the mobile phone terminal 1 is turned 90 ° in the forward direction to the posture B, the number (7) is displayed upright in the 3rd row and the 1st column. In the same manner, the number {circle over (9)} is erected in the third row and third column in the posture C, and the number {circle over (3)} is erected in the first row and third column in the posture d. As shown in FIG. 5 (c), the 4-split key top switch positions the LEDs 124 on the printed circuit board 122 corresponding to the numbers of the 4-split key top 121 around the contact portion 123 and the 4-split key top 121. The LED 124 is combined with each number facing each other.
[0019]
Referring to FIG. 6, this is a diagram for explaining how to change the orientation of the display image of the liquid crystal display device constituting the display unit.
The liquid crystal display screen of the display unit 11 of the mobile phone terminal 1 shown in FIG. 6B shows the display unit 11 shown in FIG. 6A rotated 90 ° counterclockwise. However, according to the present invention, the orientation of the display image on the display unit 11 shown in FIG. 6B can be rotated 90 ° clockwise by inputting a posture signal corresponding to the gravity direction from the display direction determining unit. Standing up. This can be executed by converting the display addresses R and C by the attitude signal corresponding to the direction of gravity via a drive circuit including drive software loaded on the mobile phone terminal 1. That is, the row addresses R1, R2, R3, ..., R9, ... in Fig. 6A are converted into column addresses C1, C2, C3, ..., C9, .... Then, the column addresses C1, C2, C3,..., C9,... Are converted into row addresses... R9,..., R3, R2,.
[0020]
Referring to FIG. 7, this is a diagram for explaining how to determine the posture.
{Circle around (1)} Which axis of X, Y, and Z is the upward axis is determined based on the detection output of the triaxial acceleration sensor. The axis with the large absolute value of the output is determined as the upward axis.
(2) Judge the polarity of the upward axis. If the output is greater than 0, it is determined to be upward, and if the output is less than 0, it is determined to be downward.
(3) Judge the level. When the absolute value Z is greater than 0.8G and the absolute value X or the absolute value Y is less than 0.2G, it is determined that the state is horizontal.
(4) Stores whether the upward axis is the X axis or the Y axis.
(5) The posture is determined with reference to the table of FIG.
[0021]
Referring to FIGS. 8 and 9, this is a diagram for explaining how to determine the display direction when horizontal. In FIG. 8, when the display mode A of (a) (a) is inclined and leveled as shown in (b) (a), it is determined that the display mode A is maintained. In FIG. 8, when the display mode B of (a) and (b) is inclined and leveled as shown in (b) and (b), it is determined that the display mode B is maintained.
In FIG. 9, the display mode B of (a) and (b) is inclined and leveled as shown in (c) and (c), and the display mode D is maintained even when rotated on a horizontal plane. If it stands as it is, it will become the display mode A of (d), and when it is made to incline as it is (c) and (d) as it is, it will maintain the display mode A despite the same posture as the right end of (c). is doing. (C) and (D) show a series of movements, and even if the circumstances are different, different displays are maintained even in the same posture.
[0022]
Referring to FIG. 10, this is a diagram illustrating a capacitive acceleration sensor. Gravity is applied to the acceleration sensor, and the central electrode as a pendulum is bent and displaced downward by a hinge as a fulcrum. As a result, the distance between the lower electrode and the central electrode decreases, and the distance between the upper electrode and the central electrode increases. In terms of the capacitance-voltage conversion circuit, the capacitance between the lower electrode and the central electrode increases, while the capacitance between the upper electrode and the central electrode decreases. Due to this change in capacitance, the signal input from the oscillator to the differential amplifier via the buffer changes, and eventually the direction of gravity can be recognized with the change in capacitance as the change in electrical signal.
[0023]
Referring to FIG. 11, this is a diagram for explaining a three-axis acceleration sensor.
The X fixed electrode pair and the Y fixed electrode pair convert the capacitance difference between the movable electrode of each electrode into an electric signal to be input acceleration, and the X fixed electrode pair uses the Y axis as the input axis. As a result, a rotational movement about the Y axis can be detected. The Y fixed electrode pair can detect a rotational movement about the X axis with the X axis as an input axis. The Z fixed electrode converts the capacitance change between the movable electrode and the movable electrode into an electric signal to obtain input acceleration in the Z-axis direction, and can detect movement in the Z-axis direction.
[0024]
This will be described with reference to FIG. This is a diagram for explaining how to determine the code arrangement of the four-divided key tops and how to arrange the four-divided key top switches of the input unit.
The arrangement state of the four-divided key tops of the desirable proper four-divided key top switch with the code upright in each posture of the mobile phone terminal 1 is shown as (a), (b), (c), (d). It is the arrangement | sequence shown by the uppermost side. In particular, the posture shown in (a) is referred to as a “basic posture” and will be described below.
[0025]
In the case of the basic posture (a), the arrangement of the four-divided key top switches is appropriate.
・ In the case of (b) posture, turn the appropriate posture (b) 90 ° counterclockwise to return to the “basic posture”. Here, the 4-split key top switch at the address of 1 row and 1 column in the “basic posture” displays 1 in addition to 1 at the address of 1 row and 1 column in the rotation posture of (b) and (b). If this is the case, it is possible to display this by selectively driving and irradiating the corresponding LED 124 with one of the four-divided key top switch at the address of the first row and the first column in (b) and (b) before the rotation. .
[0026]
・ In the case of (c) posture, rotate the appropriate posture (b) counterclockwise twice by 90 degrees in the order of (b) and (b) to return to the “basic posture”. Here, in addition to the 1 and 3 four-part key top switch at the address in the first row and the first column in the “basic posture”, the address 6 in the first row and the first column in the (c) (c) rotation posture is further added. Assuming that it is to be displayed, this is displayed by selectively driving the corresponding LED 124 to illuminate 6 of the 4-split key top switch at the address of 1 row and 1 column in (c) and (b) before rotation. be able to.
[0027]
・ In the case of (d) posture, rotate the proper (b) posture counterclockwise three times in the order of (b) (b) (c) and return to the “basic posture”. View. Here, the four-part key top switch of the address of 1 row and 1 column in the “basic posture” has the address 7 of 1 row and 1 column in the rotating posture of (d) (d) in addition to 1, 3 and 6. Is further displayed, this is displayed by selecting and irradiating the corresponding LED 124 with 7 of the 4-split key top switch at the address of 1 row and 1 column in (d) and (b) before the rotation. can do.
[0028]
After all, as the four-part key top switch at the address in the first row and the first column in the “basic posture”, the four-part key top switch shown in the address in the first row and the first column in FIG. (B), (c), and (d) can be selectively irradiated with an address of 1 row and 1 column in any posture shown on the uppermost side.
[0029]
The above description has been made for the 4-split key top switch indicated by the 1-row, 1-column address of the input unit 12. However, the same operation is performed on the 4-split key top switch at any other address (a), (B), (c), and (d) can be configured by applying to the four-divided key top switch in the arrangement shown in the uppermost side. Thereby, all the necessary irradiation displays of the 4-split keytop of the 4-split keytop switch can be set in the upper row. If these are shown in an easy-to-understand manner, they are as shown in FIGS. 13 (a), (b), (c), and (d).
[0030]
14. This will be described with reference to FIG. 14. This is a diagram for explaining a method of determining a code arrangement of a four-divided key top different from that of FIG. 12 and a method of arranging a four-divided key top switch of the input unit. In the case of this embodiment, all necessary irradiation displays of the four-part key top of the four-part key top switch are always in the lower row. The configuration of the 4-split keytop switch is the same as the operation described with reference to FIG. 12 for the 4-split keytop switch in the arrangement shown in the uppermost side of (a), (b), (c), and (d). (Note: FIG. 14 and FIG. 12 are different in that the key arrangements are combined into one, and I want to leave FIG. 14 without deleting it).
[0031]
Referring to FIG. 15, this is a case where the number of matrices of the 4-split key top switch is twelve different, but this can also be configured in substantially the same manner as described above.
[0032]
【The invention's effect】
As described above, according to the present invention, when the electronic device is a mobile phone terminal as an example, the display direction of the display content on the display screen and the push button or keyboard of the input unit can be used in any orientation. Since the arrangement of the input keys is held substantially the same, reading of the display on the display unit and input operation on the input unit are facilitated.
And even if the push button or keyboard of the input unit is positioned on the upper side of the display screen of the display unit, the display content of the display screen and the display of the push button or keyboard of the input unit are appropriately changed accordingly. The input operation can be performed while the display unit is held during input, and the input operation is stabilized.
[Brief description of the drawings]
FIG. 1 is a block diagram of an embodiment.
FIG. 2 is a block diagram of an embodiment in which a further configuration is added to the embodiment of FIG.
FIG. 3 is a perspective view of the embodiment.
FIG. 4 is a perspective view of another embodiment.
FIG. 5 is a diagram illustrating an example of a four-part key top switch.
FIG. 6 is a diagram illustrating an example of a display unit.
FIG. 7 is a diagram for explaining how to determine a posture;
FIG. 8 is a diagram for explaining how to determine the display direction when horizontal.
FIG. 9 is a continuation of FIG.
FIG. 10 is a diagram illustrating a capacitive acceleration sensor.
FIG. 11 is a diagram illustrating a three-axis acceleration sensor.
FIG. 12 is a diagram for explaining how to determine the code arrangement of a four-divided key top and how to arrange the four-divided key top switches of the input unit;
FIG. 13 is a diagram schematically showing an arrangement of four-part key top switches in a mobile phone terminal.
FIG. 14 is a diagram for explaining how to determine the code arrangement of another four-part key top and how to arrange the four-part key top switches of the input unit;
FIG. 15 is a diagram showing a case of twelve different numbers of matrices of a four-part key top switch.
FIG. 16 is a perspective view of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Display part 12 Input part 2 Input display part Control circuit part 21 Posture determination part 22 Posture memory | storage part 23 Display direction determination part 24 Display drive circuit 3 Acceleration sensor

Claims (6)

It has a four-part key top that is divided into four 90 ° opaquely by a separator, and displays numbers and other symbols on each part of the four-part key top.
A switch contact portion is positioned and fixed at the center, and a printed circuit board is provided in which the LED is positioned and fixed facing each code of the four-part key top,
Has a gravity detection sensor,
A four-part key top switch characterized in that one of the LEDs is selectively driven based on the detection output of the gravity detection sensor, and the switch contact portion is in an input waiting state. In an input device of an electronic device having a display unit and an input unit,
It has an input unit with 3 or 4 matrixes each having a quadrant key top switch as an element,
The four-divided key top switch arranged at each address of the matrix has a four-divided key top that is divided into four 90 ° opaquely by a separator, and each divided portion of the four-divided key top has a numeral or other code. Is displayed, the switch contact part is positioned and fixed at the center, the printed circuit board has the LED positioned and fixed facing each code of the 4-split key top, has the gravity detection sensor, and the detection output of the gravity detection sensor An input device characterized in that one of the LEDs is selectively driven based on the above, and the switch contact portion is in an input waiting state. The input device according to claim 2,
The input unit has a basic posture in which the sign displayed on each divided portion of the four-divided key top is upright, a 90 ° rotational posture in which the basic posture is rotated 90 ° clockwise, and a basic posture 180 ° in the clockwise direction. A rotated 180 ° rotation posture and a 270 ° rotation posture in which the basic posture is rotated 270 ° clockwise, and a numerical value is assigned to each divided portion of the four-part key top having a common address in the matrix in each posture. An input device in which other codes are arranged. An input display unit control circuit unit that controls the display unit and the input unit, the input display unit control circuit unit includes an attitude determination unit, a display direction determination unit, and a display drive circuit;
Here, the posture determination unit determines the posture of the mobile phone terminal based on the detection signal supplied from the acceleration sensor,
The input unit includes 3 or 4 matrixes each having a four-part key top switch as an element,
The four-divided key top switch arranged at each address of the matrix has a four-divided key top that is divided into four 90 ° opaquely by a separator, and each divided portion of the four-divided key top has a numeral or other code. Is displayed and has a printed circuit board in which the LED is positioned and fixed facing the respective codes of the four-part key top, and the LED is based on the detection signal supplied from the acceleration sensor. The switch contact part consists of a 4-split key top switch that waits for input.
The display direction determination unit directly inputs an attitude signal that is a determination result of the attitude determination unit and determines a display direction signal corresponding thereto,
The display drive circuit inputs the display direction signal output from the display direction determination unit, changes the drive of the display unit and the input unit in the direction corresponding to this,
The input display unit control circuit unit further includes a posture storage unit that temporarily stores a posture signal that is a determination result of the posture determination unit, and is a posture signal immediately before being stored in the posture storage unit and a determination result of the posture determination unit. A mobile phone terminal , wherein a current orientation signal is input and a display direction signal corresponding to the current orientation signal is determined based on both signals. In the mobile phone terminal according to claim 4 ,
The input unit has a basic posture in which the sign displayed on the surface of each divided portion of the four-divided key top is upright, a 90 ° rotation posture in which the basic posture is rotated 90 ° clockwise, and a basic posture in the clockwise direction. In the 180 ° rotation posture rotated 180 ° and the 270 ° rotation posture in which the basic posture is rotated 270 ° in the clockwise direction, each divided portion of the four-part key top having the same address in the matrix in each posture is used. A mobile phone terminal, wherein numbers and other symbols are arranged. In the mobile phone terminal according to claim 4 or 5 ,
Mobile telephone terminal display unit comprises a liquid crystal display device, characterized by rotating the orientation of the display image by converting the display address of the display screen by the input from the display direction determining unit attitude signal corresponding to the direction of gravity .

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