JPS5958472A - Video display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a method for displaying on a video display screen images based on video signals from a television or the like (hereinafter referred to as television images), and images based on character signals from a personal computer or the like (hereinafter referred to as television images). The present invention relates to a video display device that displays text images (hereinafter referred to as character images).

(Prior Art) Among the video display modes in such conventional video display devices, there is one in which the video display mode can be selectively switched to either a television video display mode or a text video display mode. However, not only can both images be displayed simultaneously on the same image display screen, but also
There is no one that allows the position and size of each image on the image display screen to be changed arbitrarily.

(Object of the Invention) In view of the above, an object of the present invention is to be able to simultaneously display both of the images on the same image display screen, and to arbitrarily change the position and size of each image on the image display screen. The purpose of the present invention is to provide a video display device with a

(Structure of the Invention) In order to achieve the above object, the present invention includes a video circuit that generates a video signal, a character signal generation circuit, and a signal mixing circuit that mixes both the signals and sends the mixture to a video display. In the video display device, the signal mixing circuit includes means for generating an area determination signal having a pulse width that determines the area occupied by the image based on the character signal on the video display screen, and generation timing of the area determination signal and its pulse. and means for controlling the width.

(Example) Hereinafter, the configuration of the present invention will be described in detail with respect to an example based on the drawings.

FIG. 1 is a block circuit diagram of an embodiment of the present invention. A television signal (So) is received by a receiving circuit (2) via an antenna (1). The television signal (So) received by this receiving circuit (2) is sent to the video circuit (3). In the video circuit (3), the television signal (
SO) is a video signal (Sl) and horizontal and vertical synchronization signals (
In step S2), processing such as separation is performed. Video circuit (3)
From there, a synchronizing signal (S2) is sent to a character signal generating circuit (4) of a personal computer or the like.

In response to this synchronization signal (S2), the character signal generation circuit (4) sends this character signal (SJ) to a signal mixing circuit (5) that mixes the video signal (Sl) and character signal (S3). . The signal mixing circuit (5) mixes the video signal (Sl) and character signal (S3) from the video circuit (3) and sends this mixed signal (S4) to the video display (6).

The video display device (6) displays the television video and character video on the video display screen based on this mixed signal (S4).

The signal mixing circuit (5) is designed to simultaneously display television images and character images on the same image display screen, and to enable the position and size of each image to be changed arbitrarily on the image display screen. It has the circuit shown in FIG. In FIG. 2, the signal generating circuit (51) that determines the video display area on the video display screen is connected to the signal generating circuit (51) in FIG. 3 (a) from the video circuit (3).
In response to the synchronization signal (S□) shown in ), the video display area determination signal (S5) shown in FIG. 3(b) is generated. A character video display area determination signal generation circuit (52) consisting of a one-shot multi-by-break etc. is a character signal generation circuit (4).
) from a signal having a DC level shown in FIG. 3(c) (
S6) or a Pm4 (pulse width modulation) signal (not shown), an area determination signal (S7) having a pulse width shown in FIG. 3 (cl) is generated. Both signals (S5) (S
7) is manually input to the first AND circuit (53), and the first AND circuit (53) outputs a signal (S8) having a pulse width shown in FIG. 3(e). This signal (S8)
is manually input to one input section of the second AND circuit (54). The other input section of the second AND circuit (54) is supplied with a signal (S) for switching the display mode on the video display screen to either the character video display mode or the TV video display mode.
9) is input. A second AND circuit (54) to which both the above-mentioned signals (S8XS9) are inputted outputs the signal shown in FIG. S+.) is output.

Note that the rise of the area determination signal (S7) on the image display screen of the character image corresponds to the synchronization signal (S7) in FIG.
2).

Next, the operation of the circuit shown in FIG. 2 will be explained with reference to FIG. 4 as well as FIG. 3. Figure 4 shows the video display (6
), the shaded area (p) indicates the text image area, and the non-hatched area (q) indicates the television image area.

First, a synchronization signal q(so) is manually input to the video display area determination signal generation circuit (51) at time (to) in FIG. 3(a).

As a result, the video display area determination signal (S5) is not generated from the circuit (51) at time (t+)' in FIG. 3(b).
Ru. At this time, the character video area determination signal generation circuit (
52), the signal (S7) shown in FIG. 3(d) is generated. The pulse width (T1) of this signal (S7) is
) is determined by the DC level of the signal. Therefore, from the first AND circuit (58), the pulse width (T
1) is output. This signal (S
8) is occurring, the signal (S
As shown in 9), this device has been switched to the character video display mode.

Therefore, the second AND circuit (54) outputs the signal (S8
) is outputted as a signal (Sho) having the same pulse width (T1). This signal (Sho) is approximately 115 times the pulse width of the signal (S5) in FIG. 3(b). Therefore, the pulse width of this signal e (Sto), that is, the area (p) that the character image occupies on the video display screen, is at the left end in the horizontal direction on the video display screen, as shown in FIG. 4(a). From about 11
It will be at 5. A television image is displayed in the remaining area (q). However, the signal (S6) in FIG. 3(c)
c7) By controlling the level, the pulse width of the area determination signal (S7) in FIG. 3(d) is extended from To to T2, and accordingly, the signal (
Sl. ) is also extended to the point shown by the broken line in FIG. 3(g), the character image (1)) expands as shown in FIG. 4(a) to FIG. 4(1)). As described above, according to this embodiment, it is possible to simultaneously display a television image and a text image on the same image display screen, and the size and position of each image can be arbitrarily changed on the display screen. .

In the above embodiment, a personal computer is used as the text signal generation circuit, but a text broadcast receiver may be used instead. Further, in the above embodiment, the video display area determination signal generation circuit (51)
A horizontal synchronization signal (SO) is added to the circuit (51) to control the display area of the television video and character video in the horizontal direction of the video display screen.
In addition, this control may be performed in the vertical direction of the video display screen, or this control may be performed in either the horizontal or vertical direction by adding both synchronization signals to the circuit (51). Further, the character image pattern may be formed into various patterns such as square, rectangular, circular, etc. on the image display screen.
The pattern may be enlarged or reduced. Furthermore, in the above embodiment, only in the character video display mode, that is, the second AND circuit (54) is
) The character video area can be changed by changing the pulse width of the character video area determination signal (S7) only when the signal (S9) is applied. However, when changing the character video area even in TV video display mode, In this case, the second AND circuit (54) may not be provided.

Further, in the above embodiment, by using an up/down type control signal from a remote control decoder as the signal Q(s, i) to the circuit (52), for example, text images and television images can be controlled by remote control. You can select the area ratio between

(Effects of the Invention) As explained above, since the present invention has the above configuration,
Text images and television images can be displayed simultaneously on the same image display screen, and the size and position of the area each image occupies on the image display screen can be arbitrarily changed. By projecting both of the images in various forms on the image display screen, it is possible to achieve effects such as expanding the scope of application to various uses as a display device.

[Brief explanation of drawings]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a block circuit diagram thereof, FIG. 2 is a specific configuration diagram of the signal mixing circuit, and FIG. 3 is a timing chart for explaining the operation of the circuit shown in FIG. 2. The chart, FIG. 4, is a diagram showing the display of television images and character images on a video display screen by the circuit shown in FIG. 2. (3)...Video circuit, (4)...Character signal generation circuit, (5)...Signal generation circuit, (6
)...Video display device, (5])...Video display area determination signal generation circuit, (52)...Character video display area determination signal generation circuit, (5g) (54 ,)...
...AND circuit applicant Sharp Corporation representative, embedded Benkan 10 width m Wahe Figure 2 715 Figure 4

Claims (1)

[Claims] (1) In a video display device having a video circuit that generates a video signal, a character signal generation circuit, and a signal mixing circuit that mixes both the signals and sends the mixture to the video display device, the signal mixing circuit includes a character A video display device comprising: means for generating an area determination signal having a pulse width that determines the area occupied by the video signal on a video display screen; and means for controlling the generation timing and pulse width of the area determination signal. .