JPH0160153B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color character signal generator capable of centralizing and distributing test pattern signals containing color characters for a color display receiver.

Structure of a conventional example and its problems FIG. 1 shows the structure of a color character generating device in a conventional example. This device is provided with a character signal generator 1 for black and white video, and based on the generated basic signal, in addition to the control section 2,
Various patterns of signals for color test patterns are created. This device is designed to generate a set of outputs, to which a horizontal drive pulse (HD), a vertical drive pulse (VD), and three primary color signals (R, G, B) are simply added. The character signals are then distributed by a distributor 3 and sent to each use location via a cable 4.

The configuration of the control section 2 will be explained in more detail. For example, in the case of a signal displaying characters as shown in Fig. 2, the character signal is divided into three by the distributor 5, and switches 6R, 6G,
6B is provided. Copy this output to display set 7
are applied to the R, G, and B cathodes of the CRT 8 via amplifiers 9R, 9G, and 9B, respectively. For example, if switches 6R, 6G, and 6B are all turned on,
By mixing R, G, and B, the character pattern becomes white.
Next, turn on switch 6R, switch 6G,
If you turn off 6B, it becomes a red character pattern.
In this way, character patterns in seven colors can be created by changing the combination of switches 6R, 6G, and 6B.

Next, a case will be described in which a three-color pattern of R, G, and B as shown in FIG. 3a is displayed as a test pattern signal. This is a three-color pattern: red on the top, green in the middle, and blue on the bottom. In this case, it is necessary to output the R, G, and B primary color signals sequentially and repeatedly as shown in FIG. do. Here, H-
BAR signal, V-BAR signal, blanking (BL)
Control signals r, g, and b are generated using signals such as signals as shown in FIG. 4b. A control circuit 11R provided on the output side of the distributor 5,
A pattern signal is created by switching control of 11G and 11B.

In this way, the character signal generator 1 as a whole,
A test pattern signal for the color display set is created by connecting the color signal control section 2, and the HD, VD, and R, G, B character signals are distributed by the distributor 3 and sent to each usage position. I am trying to add it to the receiver.

However, such a device has the following problems.

When each character signal of R, G, and B is transmitted through the cable 4, the phase of each character signal will shift due to variations in the length and capacity of the cable 4, and the convergence of characters that should be white will occur. The color may not be correct due to misalignment, etc.

In the case of a color display set, convergence adjustment is the main adjustment item, and if the colors in the test pattern signal itself are shifted, it becomes difficult for the set to judge how it is. adjustment becomes impossible.

When creating various patterns using the control signal generator 10, remote control at each adjustment position is not possible.

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks and provides a color character signal generating device that allows accurate adjustment and inspection without causing any deviation in test pattern signals applied to each color display receiver. The purpose is to provide

Structure of the Invention In the present invention, a test pattern signal is generated as one video signal, transmitted to each use position via one cable, and distributed into each color signal by a hand control unit at each use position to display the color signal. By supplying the spray to the receiver, it is possible to prevent the occurrence of deviations in use during transmission, and to enable arbitrary control at hand.

DESCRIPTION OF EMBODIMENTS A color character signal generating device according to an embodiment of the present invention will be described below with reference to FIGS. 5 and 6.

FIG. 5 shows a block diagram of a specific example. The character signal generator 12 generates each synchronization signal etc. and a character signal as in the conventional case. Of these, the sync signal (HD,
VD) is distributed by distributors 13 and 14 and transmitted to each usage position (No. 1 to No. 3 are shown in the figure) via cables 15 and 16. Next, the character signal is switched to a blanking signal by a switch 17, distributed by a video distributor 18, and transmitted to each use position by one cable 19. These signals are input to respective hand controls 20 provided at each use position. The video signal of the character signal is divided into three by a distributor 21 and distributed into R, G, and B signals. The switches 22R, 22G, and 22B are used to change the display color of the entire screen as described above. In this way, since this device distributes the R, G, and B signals at the point of use, there is no phase shift of each character signal during transmission via the cable 19, and no color shift occurs. This makes it possible to display accurate colors.

Next, send the character signal to one cable 19 like this.
In order to create a pattern display signal such as a three-color pattern of R, G, and B when transmitting the signal and distributing it into R, G, and B color signals at hand, it is necessary for the transmitting side to use each color. Control signal generator 2 for positioning
3, create control signals r, g, and b for R, G, and B, respectively, and transmit them to each hand position via the coaxial cable 24 and input them to the control circuits 25R, 25G, and 25B in the hand control section 20. is controlled to combine with each character signal, R, G, B
Outputs a pattern display signal. At this time, the control signals r, g, and b can be generated to display various combinations of display patterns such as a 3-color pattern, a 7-color pattern, and the like shown in FIG. It can be remotely controlled by a switch 26 provided.

Although the number of signal distributions is three in this embodiment, it is also possible to further increase the number of signal distributions.

Also, if a blanking signal BL is added with the switch 17 instead of the character signal, a pattern with only colors without characters can be created. In this way, various patterns can be created by changing or combining the timing and signals on the character signal side and the control signal side.

Effects of the Invention According to the present invention, instead of the conventional method in which test patterns of R, G, and B color signals generated by a signal generator are adjusted using cables and directly supplied to a color display receiver at the inspection position, The R, G, and B color signals generated by the signal generator are converted into video signals, and this video signal is adjusted with a cable and transmitted to the hand control unit at the inspection position, which then converts the R, G, and B color signals again. By adopting a configuration in which the color signals are distributed and input to the color display receiver at the inspection position, phase shifts do not occur during the transmission of each R, G, and B color signal in the transmission cable, and the desired It becomes possible to reliably transmit the test pattern without color shift caused by phase shift.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional example of a color character generator, Figs.
A front view of the display state and a waveform diagram of the signals used,
Figures 4a and 4b are circuit diagrams of the main parts and waveform diagrams of the signals, Figure 5 is a block diagram of a color character signal generator according to an embodiment of the present invention, and Figures 6a to 6j are its display states. FIG. 7...Color display receiver, 12...Character signal generator, 18...Video distributor, 19...
Cable, 20...Hand control unit, 21...
...Distributor, 22R, 22G, 22B...Switch, 23...Control signal generator, 24...Cable, 25R, 25G, 25B...Control circuit, 26
...Switch.

Claims (1)

[Claims] 1. A signal generator that creates a test pattern video signal containing color characters used for adjustment, inspection, etc. of color display receivers from R, G, and B color signals, and a video signal output from this signal generator. A cable for transmitting the video signal to a hand-held control section placed at an inspection position, and a hand-held control section for distributing the video signal transmitted by the cable into each color signal of R, G, and B.
A color character signal generating device characterized in that output R, G, and B color signals of a hand control provided at an inspection position are adjusted and supplied to R, G, and B inputs of the color display receiver at the inspection position.