JP2000112447A - Display device, main device, display system, resolution setting method, and information processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make automatically settable a picture signal from a host device to a resolution with which a display device can perform a display especially in a display device capable of performing a display with different resolutions by receiving the picture signal from the host device. SOLUTION: A display circuit 102 receives picture data from a picture signal line 15 and judges whether the data are displayable on a display part 102 or not. When the data are displayable on the part 101, the circuit 12 make the data display on the part 101 and when the data are indisplayable on the part 101, the circuit 102 transmits an indisplayable signal to an instruction circuit 104. The circuit 104 receives the indisplayable signal and transmits display mode information in a mode storage part 103 and a display mode changing instruction to the change circuit 209 of a main device 20 via a resolution instructing line 16. Then, the circuit 209 instructs a processor 207 to change a display mode by judging a displayable display mode of the display device 10 from received display mode information and display modes set in the main device 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device capable of receiving an image signal from a host device and displaying the image signal at a different resolution. On how to do it.

[0002]

2. Description of the Related Art Conventionally, a main unit and a display device for controlling a display device have display modes from low resolution to high resolution as shown in modes to mode 5 in FIG. The display mode is set. FIG. 4 is a block diagram of a display process of the conventional main body device c40 and display device c30. The processor c405 performs a process corresponding to the instruction of the operator. The memory c404 is
The display control circuit c403 stores the image data from the processor c405, and transmits the image data stored in the memory c404 to the display circuit c302 by a method according to the display mode set in the mode setting unit c406. Display circuit c
A display 302 displays the received image data on the display unit c301.

Japanese Patent Application Laid-Open No. Hei 7-199855 discloses a "dot matrix type display device", in which even if video signals of various different resolutions and synchronization frequencies are input, a dot matrix type display panel having a fixed display resolution can be correctly displayed. A dot matrix type display device capable of displaying an image is disclosed.

Japanese Patent Laid-Open Publication No. Hei 10-74072 discloses a display device and a control method thereof, in which a non-volatile memory for storing monitor specification data required for display setup and a monitor specification are downloaded into a display device compatible with plug and play. A display device having a RAM for transferring monitor specifications to a computer according to an instruction from a connected computer and a control method thereof are disclosed.

[0005]

However, the prior art has the following problems. FIG. 2 is a diagram showing displayable modes and resolutions of the display device and the main device. FIG.
1 is a block diagram showing a configuration of a conventional main body device 40 and a conventional display device 30. In FIG. 4, a conventional display device 30 includes a display unit c301 and a display circuit c302. The conventional main unit 40 includes a display control circuit c403, a memory c404, a processor c405, and a mode setting unit c4.
06. In a state where the conventional main unit 40 capable of displaying the mode from the mode and the conventional display unit 30 capable of displaying the mode and the mode are connected, the operator mistakenly sets the display mode of the conventional main unit 40 to the mode. Consider the case. Display control circuit c
403 transmits image data in a format according to the display mode of the mode set in the mode setting unit c406. The display circuit c302 receives the image data in the resolution format of mode number 3, but does not display the image data on the display unit c301 because the image data in the resolution mode of the mode image cannot be displayed. In this state, the conventional main unit 40
In order to change the mode setting unit c 406 to the mode or the mode display mode, the change is performed using the operating system of the conventional main unit 40. However, since this operating system is operated according to the operating screen of the operating system displayed on the conventional display device 30, the display mode is changed in the above-described state where the image data cannot be displayed on the conventional display device 30. I can't do it. To change the display mode, a method of changing the display mode during the operation of reinstalling the conventional main unit 40 using the low-resolution mode of the mode and the display mode of the mode set in the conventional main unit 40 are displayed. The possible conventional display device 30 is connected to the conventional main body device 40, and while the operation screen of the operating system is displayed, the operating system is operated to change the display mode. Are conceivable, but both methods have a problem that they cannot be easily implemented.

Japanese Unexamined Patent Publication No. Hei 7-199855 discloses a "dot matrix type display device" which is complicated and expensive because it requires a lot of hardware such as a timing controller, a frame memory, an AD conversion unit, and a scaling unit. ing.

Japanese Patent Laid-Open Publication No. Hei 10-74072 discloses a method of notifying a computer of a displayable resolution according to a predetermined protocol, and displaying a received image signal on the display device. I can't tell if I can.

[0008]

A first display device of the present invention has at least one displayable resolution, and in a display device for displaying an image by an image signal from a main unit, the display device has a display resolution of the displayable resolution. Means for storing information; means for determining whether the image data sent from the main unit can be displayed; and, when the display cannot be performed by the determination, the resolution information and an instruction to change the resolution are sent to the main unit. Means for sending to

The second display device of the present invention, in the first display device of the present invention, determines whether display is possible based on a vertical synchronization signal and a horizontal synchronization signal of the image signal from the main unit. .

The main unit of the present invention is capable of generating image signals of a plurality of different resolutions, selects an image signal of a specific resolution from the image signals of the plurality of resolutions, and transmits the selected image signal to a display device. In the main body device, after the main body device transmits an image signal of a first resolution, a means for receiving displayable resolution information and a resolution change instruction of the display device from the display device, and a second from the resolution information Means for selecting an image signal of a resolution and means for transmitting image information of the second resolution.

A first display system according to the present invention is a display device which has at least one displayable resolution and displays an image based on an image signal from a main unit, and stores information on the displayable resolution, Means for determining whether the image data sent from the main unit can be displayed, and means for transmitting information on the resolution and an instruction to change the resolution to the main unit when the image data cannot be displayed by the determination. And a display device capable of generating image signals of a plurality of different resolutions, and selecting an image signal of a specific resolution from the image signals of the plurality of resolutions and transmitting the selected image signal to the display device. In the device, after the main device transmits an image signal of the first resolution, the main device receives resolution information displayable by the display device and a resolution change instruction from the display device. Body and wherein the stage, means for selecting an image signal of a second resolution from the resolution information, in that it comprises means for transmitting the image information of the second resolution, with a city.

The first display system of the present invention has the main unit of the present invention and the second display device of the present invention.

A resolution setting method according to the present invention is directed to a display device having means for storing displayable resolution information, having at least one displayable resolution, and displaying an image by an image signal from a main unit. A step of determining whether the image data sent from the main unit can be displayed, and a step of transmitting the resolution information and the instruction to change the resolution to the main unit when the image data cannot be displayed by the determination. A main unit capable of generating image signals of a plurality of different resolutions and selecting an image signal of a specific resolution from the image signals of the plurality of resolutions and transmitting the selected image signal to a display device. Transmitting a first resolution image signal, receiving from the display device resolution information displayable by the display device and a resolution change instruction, and the resolution It has a procedure for selecting an image signal of a second resolution from the broadcast, the procedure of transmitting the image information of the second resolution.

An information processing apparatus according to the present invention includes an input / output control device for connecting the first display system or the second display system according to the present invention, a central processing unit, and a main storage device.

[0015]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a body device 20 and a display device 10 in a display system 1 according to an embodiment of the present invention.

The display device 10 includes a display unit 101, a display circuit 102, a mode storage unit 103, and an instruction circuit 104. The display unit 101 displays image data under the control of the display circuit 102. The display circuit 102 receives image data from the image signal line 15 and determines whether display is possible. This determination is made by analyzing the vertical synchronization signal and the horizontal same signal of the received image signal. If display is possible, image data is displayed on the display unit 101. If display is impossible, a signal is transmitted to the instruction circuit 104. Mode storage unit 10
In 3, all display mode information that can be displayed by the display unit 101 is set. The instruction circuit 104 includes the display circuit 102
, And transmits the display mode information of the mode storage unit 103 and the change instruction to the change circuit 209.

The main unit 20 comprises a display control circuit 205, a memory 206, a processor 207, a mode setting section 208, and a change circuit 209. Mode setting unit 208
Indicates the display mode. The setting circuit 209 receives the display mode information and the change instruction from the instruction circuit 104,
The received display mode information is compared with the display mode set in the mode setting unit 208 to select the display mode with the highest resolution, and instruct the processor 207 to change the display mode. The processor 207 performs a process of setting the designated display mode in the mode setting unit 208 and a process corresponding to the instruction 29 from the operator. During the processing corresponding to the instruction 29 from the operator, the mode setting unit 20 is operated by the display mode change operation by the operating system.
8 can also be set. The memory 206 stores the image data from the processor 207. The display control circuit 205 transmits the image data stored in the memory 206 to the display circuit 102 according to the display mode set in the mode setting unit 208.

Next, the operation of the embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a diagram showing displayable modes and resolutions of the display device and the main unit. As shown in FIG. 2, the display mode of the main device 20 can be set from a mode to a mode display mode, and the mode setting unit 208 is set to the mode. The case where the display device 10 can display only the mode and the display mode of the mode, and the mode storage unit 103 sets the mode and the display mode information of the mode will be described.

The processor 207 sets the display mode in accordance with the processing corresponding to the instruction 29 from the operator and the instruction from the change circuit 209. The memory 206 stores the image data from the host device interface 201, and the display control circuit 205 converts the image data according to the display mode of the mode set in the change circuit 208 into the image signal line 15.
Send to The display circuit 102 receives the image data of the mode, and determines whether the image data can be displayed on the display unit 101. This determination is made by analyzing the vertical synchronization signal and the horizontal same signal of the received image signal. The display circuit 102 determines that display is not possible because the display device 10 can display only the mode and the mode, and transmits a display disable signal to the instruction circuit 104. In response to the display disable signal, the instruction circuit 104 reads the mode set in the mode storage unit 103 and the display mode information of the mode, and transmits it to the change circuit 209 via the resolution instruction signal line 16. The change circuit 209 selects the highest resolution mode from the received display mode information, and instructs the processor 207 to set the mode display mode. The processor 207 sets the mode number 2 display mode in the mode setting unit 208. Thereby,
The display control circuit 205 transmits the image data in the mode set in the mode setting unit 208 to the display circuit 102. The display circuit 102 displays the image data on the display unit 101 because the display circuit 102 can receive and display the image data in the mode format.

FIG. 3 is a block diagram showing an information apparatus according to the embodiment of the present invention.

Reference numeral 901 denotes a central processing unit; 902, a memory device; 903, an input / output control unit; and 904, a bus for connecting them. The central processing unit 901 includes an input / output control unit 90
3 and the memory device 902 via a bus 904. The input / output control unit 903 is connected to the display system 1 described above. The central processing unit 901 is a memory device 902
The control program stored therein is read out, an instruction is issued to the input / output control unit 903 in accordance with the instruction, and information from the display system 1 connected to the input / output control unit 903 and the signal line 28 to the host device is transmitted to the bus 904. Then, the information is stored in the memory device 902 or the information in the memory device 902 is read and written to the input / output control unit 903. The input / output control unit is a central processing unit 901 or a memory device 902
The display system 1 is controlled and displayed in accordance with the instruction from.

[0024]

The first effect of the present invention is that, when the display mode set in the main unit 20 and the display mode in which the display device 10 can display are different and the display device 10 cannot display image data, The display device 10 can determine that display is not possible. The second effect of the present invention is that, when it is determined that the display is not possible, an instruction to change the screen display mode is issued to the main device 20, and the main device 20 changes the display mode to a display mode in accordance with the display mode change instruction. The image data in a format that can be displayed by the image data 10 can be transmitted to the display device 10 so that the image data can be easily changed from a non-display state to a display state. A third effect of the present invention is that the state can be changed from a non-display state to a display state without bothering the user.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a main body device 20 and a display device 10 in a display system according to an embodiment of the present invention.

FIG. 2 is a diagram showing displayable modes and resolutions of a display device and a main device.

FIG. 3 is a block diagram illustrating a configuration of an information processing apparatus according to an embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a conventional main body device 40 and a conventional display device 30.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 display system 10 display device 15 image signal line 16 resolution instruction signal line 101 display unit 102 display circuit 103 mode storage unit 104 instruction circuit 20 main unit 28 signal line to host device 29 instruction from operator 205 display control circuit 206 memory 207 Processor 208 Mode setting unit 209 Change circuit 201 Host device interface 30 Conventional display device 301 Display unit c 302 Display circuit c 40 Conventional main unit 403 Display control circuit c 404 Memory c 405 Processor c 406 Mode setting unit c 901 Central processing unit 902 memory device 903 input / output control unit 904 bus

Claims (7)

[Claims] 1. A display device having at least one displayable resolution and displaying an image in response to an image signal from a main unit, means for storing information of the displayable resolution, A display device, comprising: means for judging whether or not the incoming image data can be displayed, and means for transmitting the resolution information and the instruction to change the resolution to the main unit when the image data cannot be displayed by the judgment. 2. A main body device capable of generating image signals of a plurality of different resolutions, selecting an image signal of a specific resolution from the image signals of the plurality of resolutions, and transmitting the selected image signal to a display device. Means for receiving, from the display device, resolution information capable of being displayed by the display device and a resolution change instruction from the display device, and transmitting the second resolution image signal from the resolution information. A main unit comprising: means for selecting; and means for transmitting the image information of the second resolution. 3. A display device having at least one displayable resolution and displaying an image in response to an image signal from a main unit, means for storing information on the displayable resolution, A display device having means for determining whether or not the incoming image data can be displayed, and means for transmitting information on the resolution and an instruction to change the resolution to the main device when the display is not possible by the determination. A main unit capable of generating image signals of a plurality of different resolutions, selecting an image signal of a specific resolution from the image signals of the plurality of resolutions, and transmitting the selected image signal to a display device. Means for receiving, from the display device, resolution information that can be displayed on the display device and a resolution change instruction after transmitting the image signal of the first resolution, and Means for selecting an image signal of a second resolution, the main unit and having a second resolution means for transmitting the image information, the display system characterized by having a city. 4. The display device according to claim 1, wherein the determination as to whether display is possible is made based on a vertical synchronization signal and a horizontal synchronization signal of the image signal from the main device. 5. A display system comprising the display device according to claim 4 and the main unit according to claim 2. 6. A display device having means for storing displayable resolution information, having at least one of the displayable resolutions, and displaying an image in response to an image signal from the main unit. Determining whether the received image data can be displayed, and transmitting the resolution information and the resolution change instruction to the main unit when the display cannot be performed by the determination. It is possible to generate an image signal of, in a main unit that selects an image signal of a specific resolution from the image signals of the plurality of resolutions and transmits it to a display device, wherein the main unit has a first resolution A step of transmitting an image signal, a step of receiving displayable resolution information and a resolution change instruction of the display device from the display device, and a second resolution image based on the resolution information. Resolution setting method characterized by comprising the steps of selecting a signal, the step of transmitting the image information of the second resolution. 7. An information processing apparatus, comprising: an input / output control device for connecting the display system according to claim 3; a central processing unit; and a main storage device.