JPH047735A - Video signal generating device - Google Patents

Abstract

PURPOSE:To display pictures even with a computer that has no output of video signals or a computer that has the different forms of video signals by generating the video signals based on the printer driving image information signals inputted from a data interface. CONSTITUTION:A printer driving picture information signal (a) is inputted to a data command buffer (data interface) 3 from a computer 20 like a personal computer, a palm-top computer, etc., via a connector 30. Then the signal (a) is fetched by a bit map evolving circuit (picture pattern generating means) 5. Then a picture pattern signal (b) is produced in response to the signal (a) inputted from the interface 3, and a video signal (c) is produced in response to the signal (b). Thus the pictures can be displayed by a projector, for example, even with a computer that has no output of the video signals or a computer that has the different forms of video signals.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video signal generation device suitable for displaying images from a computer that cannot output video signals in a predetermined format such as NTSC using, for example, a projector.

[Summary of the invention]

The present invention relates to a video signal generation device that is suitable for displaying images from a computer that cannot output video signals in a predetermined format such as NTSC, using a projector, for example. With the configuration in which video signals are generated, images can be displayed even on computers that do not output video signals or that use video signals in different formats.

(Prior Art) For example, a projector for displaying a computer image has a display device such as a liquid crystal display, and an optical system for projecting the image displayed on the display device onto a desired panel or the like. ing.

In this case, the light source for projecting the image may be built-in to the projector or OHP (Over Hear).
In some cases, the transparent liquid crystal display and the light source are separate bodies, as in the case of the d Projecter.

Then, the image is input from the computer to the display device as a video signal in a predetermined format such as NTSC.

[Problem to be solved by the invention]

Therefore, there has been a problem that the image cannot be displayed on a computer that cannot output a video signal or a computer that inputs a video signal to a display device in a different format.

SUMMARY OF THE INVENTION An object of the present invention is to provide a video signal generation device that can display an image even if the computer cannot output a video signal or the format of the video signal is different.

[Means to solve the problem]

In order to achieve the above object, a video signal generation device according to the present invention includes a storage means (7) in which pixel information including at least a character pattern is stored, and an image information signal for driving a printer ( In response to the input of a), based on the pixel information read out from the storage means (7),
an image pattern signal generation means (5) for generating an image pattern signal (b) corresponding to the image information signal; and an image pattern signal generation means (5) based on the image pattern signal (b) sequentially inputted from the image pattern signal generation means (5). , and a video signal generating means (9) for generating a video signal (C) corresponding to the image pattern signals (b) and c.

[Function] In the video signal generation device according to the present invention, an image pattern signal corresponding to an image information signal for driving a printer inputted from a data interface is generated, and a video signal corresponding to the image pattern signal is generated. .

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a video signal generation device according to the present invention will be described below with reference to the drawings.

In FIG. 1, in the device (1) to which the present invention is applied,
An image information signal (a) for driving the printer is transmitted from a computer (20) such as a personal computer or a palm top computer to a data command controller (30) via a connector (30).
The data is input to the data interface (3) and taken into the bitmap expansion circuit (image pattern generation means) (5).

In this case, the computer (20) outputs the image information signal (a) via, for example, a Centronics-compliant printer interface (2OA).

The bitmap expansion circuit (5) is mainly composed of a CPU (not shown), a working RAM, a program ROM, etc., and the pixel information of the ROM (storage means) (7) in which pixel information such as character patterns and graphic buttons is stored is stored. Based on the image pattern signal (b) corresponding to the image information signal (a) taken in from the data command center (3)
generate.

The image pattern signal (b) is taken into the video signal generation circuit (generation means) (9), converted into a digitized video signal (C), and stored in the image memory (11), where it is processed as needed. and is output to the output terminal (13).

And, as understood from FIG. 2, the light source (100)
and display device i (200) are separate projectors (
300), or, as understood from FIG. 3, in a projector (400) with a built-in light source, a device (]) is provided in the projector (300), (400), and an output terminal (]3) The output (C) is the display device (200)
Otsuko is taken in.

In this case, in the display device (200), the video signal (C) is D/A converted and an image displayed on a liquid crystal display or the like is projected and displayed on a suitable panel surface or the like.

On the other hand, as understood from FIG. 4, when the device (1) is used as a video adapter (500), the video signal (c) output from the output terminal (13) is further transferred to the video signal conversion circuit ( 17) and D/A converted analog video signal (CA) output terminal (19)
The device (1) is outputted to, for example, a monitor CRT, etc.
is configured as above, so the computer (
20) is operated in the same manner as driving a printer,
The projectors (300) and (400) project and display an image similar to the image printed by the printer, while the video adapter (500) transmits an analog video signal (CA) corresponding to the image to the terminal (19). ) is output.

In addition, as a printer interface (20A), in addition to Centronics compliant, RS-232CJiJ
Examples include an interface of [, an interface of the TEEE488 standard, an interface of the 5C3I standard, etc.

It is also preferable to change the circuit design of the interface (2OA) so that image data can be input to the computer (20) via, for example, a video adapter (500).

As explained above, in this embodiment, the computer (
The image information signal (a) inputted from 20) is inputted from vi.

The image pattern signal (b) is converted into an image pattern signal (b) by the Tomanop expansion circuit (5), and the image pattern signal (b) is converted to an image pattern signal (b) by the video signal generation circuit (5).
9), it is converted into a video signal (C).

Therefore, the computer (2
0) is operated, the projectors (300) (4
00), while the video adapter (
500) can output an analog video signal (CA).

In other words, a computer (20) that cannot output video
, or a computer with a different video signal format (20
), for example, projectors (300) (400
It becomes possible to display images on the screen.

Further, since the computer (20) does not require design changes (modifications) such as newly installing a special device driver, the device (1) has excellent versatility.

Note that the present invention can also be applied when control is performed using postscript.

〔Effect of the invention〕

As understood from the above description, in the video signal generation device according to the present invention, an image pattern signal corresponding to an image information signal for driving a printer inputted from a data interface is generated, and a signal corresponding to the image pattern signal is generated. A video signal is generated.

Therefore, even if the computer does not output a video signal or the video signal has a different format, it is possible to display an image using a projector, for example.

Furthermore, since no design changes are required on the computer side, it has excellent versatility.

[Brief explanation of the drawing]

1 is a block V showing the electrical configuration of a preferred embodiment of the video signal generation device according to the present invention, FIG.
The figure is a perspective view when the present invention is applied to a projector, and the fourth figure is a perspective view when the present invention is applied to a video adapter. (1) is a video signal generation device, (5) is a bitmap expansion circuit (image pattern generation means), and (7) is a ROM (
(9) is a video signal generation circuit (generation means);
(20) is the computer, (20A) is the printer interface (data interface), (10
0) is a light source, (200) is a display device, (300),
(400) is a projector, (500) is a video adapter, (a) is an image information signal, (b) is an image pattern signal, and (C) is a video signal.

Claims (1)

[Scope of Claims] Storage means for storing pixel information including at least a character pattern; and the pixels read from the storage means in response to input of an image information signal for driving a printer from a data interface. an image pattern signal generation means for generating an image pattern signal corresponding to the image information signal based on the information; 1. A video signal generation device comprising: video signal generation means for generating a video signal.