JP2796768B2 - Multi display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-display device having a plurality of displays.

[0002]

2. Description of the Related Art At present, a notebook type personal computer has only one liquid crystal display, and a display screen is directed toward an operator. This type of personal computer is not suitable for conducting a business negotiation while showing a catalog of products displayed on a display screen to a customer sitting face to face, for example.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a multi-display apparatus in which a person other than an operator can view a display screen. It is an object.

[0004]

FIG. 1 is a diagram illustrating the principle of the present invention. The multi-display device according to claim 1 has a first
Flat display, a second flat display rotatably attached to a side of the first flat display, and a second flat display for storing the same display data as the display data to the first flat display. A video memory provided in the flat display, a sensor for detecting an angle between the first flat display and the second flat display, and an ascending or descending address according to the angle detected by the sensor. Address generating means for providing a column to the video memory.

According to a second aspect of the present invention, there is provided a multi-display apparatus according to the first aspect, wherein the first flat display and the second flat display are mechanically and electrically connected by a ring having a coil therein. Some are characterized by being connected.

[0006]

The operation of the multi-display device according to claim 1 will be described. The second flat display is pivotally mounted on a side (for example, an upper edge) of the first flat display, and can be tilted away as shown by a dotted line, or can be tilted forward. In the illustrated example, when the second flat display is facing forward, the letter A is displayed upright. In this state, when the second flat display is tilted to the other side as shown by the dotted line, the character A looks reverse to the person on the other side. In order for the letter A to appear upright when the second flat panel display is tilted away from the other side, the pixels constituting the letter A must be displayed at different positions.

[0007] The video memory and the address generating means reside in the second flat display. The address generating means is for a video memory. The sensor detects an angle between the first flat display and the second flat display. In the video memory, display data for the first flat display is written. 0, when the angle between the first flat display and the second flat display is 180 degrees or less.
, N (maximum address) are applied to the video memory, and the first flat display and the second
Is greater than 180 degrees, a write address string of N, N-1,..., 0 is provided to the video memory.

After one frame of display data is written to the video memory, the display data in the video memory is read and displayed on the screen of the second flat display. The read address string is 0, 1,..., N in any case.

The operation of the multi-display device according to claim 2 will be described. The first flat display and the second flat display are connected by a ring.
There is a coil in the ring. A power line or a data line of the first flat display is connected to the coil in the ring. A coil is wound around a hole in the second flat panel display through which the ring passes. Therefore, the first flat display and the second flat display are electromagnetically coupled, and power and data can be transmitted from the first flat display to the second flat display by electromagnetic induction.

[0010]

FIG. 2 is a diagram showing an example of an electric circuit according to the present invention. In the figure, 1 is a computer main body, 2-1 is a first liquid crystal display, 2-2 is a second liquid crystal display, 3
Is a VRAM (video memory), 4 is a sensor, 5 is an address switch, 6-1 is a first address generator, 6-2 is a second address generator, and 7 is a timing generator. . The display data output from the main body 1 is displayed on the first liquid crystal display 2-1. Also, the first
Display data sent to the liquid crystal display 2-1 of VR
The data is input to the memory data bus of AM3, and about one frame is stored in VRAM3, and then sent to the second liquid crystal display 2-2 via the serial data bus of VRAM3. The VRAM input (write) address is obtained from the first address generator 6-1 and the VRAM output (read) address is obtained from the second address generator 6-2. The main body 1 sends display data and FLM (first line marker) or VSYNC (vertical synchronization) indicating the start of a frame.

The first address generator 6-1 and the second address generator 6-2 are initialized by the FLM signal, and thereafter, count up or count down is performed every time data is input. Depending on the angle of the second liquid crystal display 2-2 (determined by the sensor 4), whether the address is displayed in the same direction as the first liquid crystal display 2-1 or displayed upside down, left and right is determined. In the case of the same as the liquid crystal display (however, the screen is assumed to be 256 × 256 dots), the first address generator 0000,0001, ... FFFF, 0000, ... second address generator 0000,0001, ... FFFF, 0000 , ...... When the display is upside down and left and right, the first address generator FFFF, FFFE, FFFD, ... 0000, FFFF,
…… Second address generator 0000,0001,0002,… FFFF, 0000,
Change the address as shown. Timing generator 7
Generates address generation timing, VRAM DT (data transfer), RAS, CAS, etc., based on a control signal sent from the main unit 1.

FIG. 3 shows an example of the sensor section. In the figure, 8 is a decision unit, 9 is a counter, 10 is a rotary encoder, 11 is a connection unit, 12 is a socket, 13
Indicates plugs, respectively. Plug 13 and connection part 1
Numeral 1 is for transmitting data and power from the first liquid crystal display 2-1 to the second liquid crystal display 2-2. The plug 13 is fitted into the socket 12 of the connection part 11. The second liquid crystal display 2-2 is rotatably attached to the connection unit 11.

The rotary encoder 10 generates a pulse every time the rotary encoder 10 rotates by a predetermined angle. The determiner 8, the counter 9, and the rotary encoder 10 exist in the second liquid crystal display 2-2. When the connection unit 11 rotates, the shaft connected to the connection unit 11 also rotates, and the rotation angle of the connection unit 11 with respect to the second liquid crystal display 2-2 is detected by the rotary encoder 10 and the counter 9. The determiner 8 compares the value of the counter (the rotation angle of the second liquid crystal display) with a preset value, and performs address switching. In addition, the sensor 4 of FIG.
It comprises a counter 9 and a rotary encoder 10.

FIGS. 4 and 5 are diagrams for explaining the operation of the circuit shown in FIG. 2 when the second liquid crystal display is upside down, left and right with respect to the first liquid crystal display. Since FIGS. 4 and 5 can be easily understood from the above description, the description is omitted.

FIG. 6 is a diagram showing another example of the multi-display device of the present invention. In the figure, 20 is a power transmission ring, 21 is a data transmission ring, 22 is a stand that can be stored, and 23 is a wireless device. The power transmission ring 20 and the data transmission ring 21 have substantially the same shape. The power transmission ring 20 contains a coil. The second liquid crystal display 2-2 is connected to the side of the first liquid crystal display 2-1 via a power transmission ring 20 and a data transmission ring 21. The second liquid crystal display 2-2 can be rotated 360 degrees.

A coil is provided around the power transmission ring 20 in the second liquid crystal display 2-2, and the second liquid crystal display 2-2 is connected to the second display from the first display 2-1 by electromagnetic coupling.
Can be transmitted to the display 2-2. Similarly, a coil is provided around the data transmission ring 21 in the second liquid crystal display 2-2, and data is transferred from the first liquid crystal display 2-1 to the second liquid crystal display 2-2 by electromagnetic coupling. Can be sent. The stand 22 can be stored in the second liquid crystal display 2-2. The wireless device 23 can also control a remote liquid crystal display.

FIG. 7 is a diagram showing a shaft lock with a built-in coil according to the present invention. In the figure, reference numeral 24 denotes a cylindrical insertion portion;
Denotes a cylindrical housing, 26 denotes a hole, and C1 and C2 denote coils. The cylindrical insertion portion 24 is provided in the main body 1, and the cylindrical accommodation portion 25 is provided in the first liquid crystal display 2.
-1. Insert the insertion portion 24 into the hole 2 of the accommodation portion 25
6, the main body 1 and the first liquid crystal display 2-1 are rotatably connected. A coil C1 is provided near the insertion portion 24, and a coil C2 is provided around the hole 26.
Is provided. Therefore, coil C1 and coil C2
Are electromagnetically coupled and can transmit power and data between them.

[0018]

As is apparent from the above description, according to the present invention, by providing the second liquid crystal display with hardware for changing the display contents, the basic circuit and the software on the main body side are not changed. In addition, erect characters and images can be displayed on the second liquid crystal display screen regardless of the rotation angle of the second liquid crystal display with respect to the first liquid crystal display. Further, according to the present invention, the second
The first liquid crystal display can be rotated 360 degrees.
Can be attached to the side of the liquid crystal display.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a diagram showing one example of an electric circuit of the present invention.

FIG. 3 is a diagram showing one example of a sensor unit of the present invention.

FIG. 4 is an explanatory diagram of the operation of the circuit in FIG. 2;

FIG. 5 is an explanatory diagram (continued) of the circuit operation of FIG. 2;

FIG. 6 is a diagram showing another example of the multi display device of the present invention.

FIG. 7 is a view showing a shaft with a built-in coil according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Computer main body 2-1 1st liquid crystal display 2-2 2nd liquid crystal display 3 VRAM 4 sensor 5 Address switch 6-1 1st address generator 6-2 2nd address generator 7 Timing generator

Continued on the front page (72) Inventor Toshiro Sukuya 98, Unoki-nu, Unoki-cho, Hebei-gun, Ishikawa Prefecture PFU Co., Ltd. (72) Inventor Masaki Watanabe 98-2, Unoki-nu, Unoki-cho, Kawakita-gun, Ishikawa PFU Co., Ltd. (72) Inventor Shigenori Uesugi 98, Unoki-nu, Unoki-cho, Hebei-gun, Ishikawa Prefecture 2 PFU Co., Ltd. 213496 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G06F 3/14 G06F 1/16 G09F 9/00

Claims (2)

(57) [Claims] 1. A first flat display, a second flat display rotatably mounted on a side of the first flat display, and the same display as display data on the first flat display. A video memory provided in a second flat panel display for storing data; a sensor for detecting an angle between the first flat panel display and the second flat panel display; And an address generating means for providing an ascending or descending address sequence to the video memory. 2. The multi-display according to claim 1, wherein the first flat display and the second flat display are mechanically and electrically connected by a ring having a coil therein. apparatus.