JP2563356B2 - Image adjustment pattern generator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image adjustment pattern generator used when performing convergence adjustment and focus adjustment of a color television receiver.

2. Description of the Related Art In a shadow mask type color picture tube used in a general color television receiver, the distance from the deflection center to the inner surface of the face of the shadow mask and the glass bulb, that is, the phosphor coating surface is different, and the shadow mask and face Since the inner surface has a larger radius of curvature, color misregistration between the three primary colors, so-called misconvergence, occurs, and a difference in focus voltage continuously occurs between the central portion and the peripheral portion of the screen on the inner surface of the face.

Also, in a projection type color television receiver that magnifies and projects using three picture tubes emitting three primary colors, focusing is performed continuously in the center and peripheral areas of the screen as in the case of the color picture tube. There is a difference in voltage. Convergence causes color shift or misconvergence on the screen because the angle of incidence of the picture tube on the screen differs for each picture tube.

As an auxiliary pattern for adjusting both the convergence and focus items shown above, a generator for generating an auxiliary pattern called a crosshatch as shown in FIG. The same pattern signal of the above crosshatch pattern can be applied to the electron gun cathode of the above, and a crosshatch pattern of a single color or arbitrary plural colors can be displayed on the screen as needed, and convergence adjustment and focus can be performed based on visual judgment. I have made adjustments.

FIG. 5 shows the structure of the cross-hatch pattern generating device and will be described. Horizontal and vertical sync signals 11 are control circuits 12
Then, the waveform is shaped and processed by the crosshatch pattern generation circuit 13, and a video signal for displaying the crosshatch pattern is output. This is distributed to 3 channels,
It is applied to the electron gun cursors 15, 16, 17 of each of the three primary colors according to the selections made by the keyboard 18 and the color switching unit 14, and the 6th color is displayed on the screen.
A cross hatch pattern as shown in the figure is displayed.

Problems to be Solved by the Invention However, the cross hatch pattern as described above has the following problems.

When the operator makes a visual judgment, firstly, in the convergence adjustment, it is only necessary to be close to the screen to judge the superposition state of two or three colors using thin vertical and horizontal lines with high resolution. It is difficult to judge with high resolution. In addition, in the case of blue, the visibility is low, so that the resolution is low particularly in the projection type color television receiver.

Second, the focus adjustment uses a monochromatic crosshatch pattern, but it is difficult to determine the change in thickness due to the focus voltage of the thin light emitting line, and halation occurs on both sides of the light emitting line in the peripheral portion, which results in the best focus state. Is difficult to judge. In addition, as with the case of the above-mentioned convergence adjustment, for the blue color in the projection type color image receiver, since the visibility is low, the focus adjustment is extremely difficult.

In view of the above problems, it is an object of the present invention to provide an apparatus capable of performing convergence adjustment and focus adjustment easily and with high accuracy.

Means for Solving the Problems In order to achieve the above object, the image adjustment pattern generator of the present invention generates auxiliary patterns of crosshatch, crosshatch inversion, and all-white raster as adjustment patterns to perform convergence adjustment. Sometimes it is possible to combine the green crosshatch pattern with the red and blue crosshatch inversion patterns, and at the time of focus adjustment, it is possible to display combinations such as combining the all-white pattern and the crosshatch inversion pattern in any two colors. It is equipped with.

With the above-described configuration, the present invention can display any combination of auxiliary patterns during the convergence adjustment and the focus adjustment, which makes it possible to form an auxiliary pattern suitable for the adjustment, and easily and accurately It is possible to make both adjustments.

Example Hereinafter, an image adjustment pattern generating apparatus according to an example of the present invention will be described with reference to a screen. FIG. 1 is a block diagram of an image adjustment pattern generation device according to an embodiment of the present invention.

After passing through the control circuit 2, the synchronizing signal 1 is distributed and input to the crosshatch generation circuit 3 and the all-white raster generation circuit 4. The video signals of the auxiliary patterns output from the respective generation circuits 3 and 4 are input to the selection combination circuit 6. The output from the crosshatch generation circuit 3 is distributed and also input to the inversion circuit 5 and input to the selection combination circuit 6 as a crosshatch inversion pattern. Select the auxiliary pattern of cross hatch, cross hatch inversion, or all-white raster, and select 3
An instruction as to whether to apply the voltage to the cathodes 7, 8, 9 of the primary colors and display the image on the screen is given by the operator's operation from the keyboard 10.

Screen display examples for each of the above patterns Fig. 2 a, b, c
Shown in

Next, a selection combination example of display patterns of each of the three primary colors at the time of convergence adjustment and focus adjustment will be described with reference to the selection combination example diagram of FIG. 3 and the explanatory diagram of FIG.

Convergence adjustment will be described taking the case of blue as an example. As for the combination of display patterns, as shown in FIG. 3, green is a crosshatch pattern and blue is a crosshatch inversion pattern. The color overlapping state of the two colors in the above case is the fourth
Shown in Figure a. A broken line shows a reference green crosshatch pattern, and a solid line shows a blue crosshatch reversal pattern which is the adjusted color.

As in the example of FIG. 4, in the misconvergence state, the color overlapping portion (hatched portion) due to color shift emits bluish white light. Therefore, as the convergence adjustment, blue color overlap correction may be performed so that there is no portion that emits bluish white light, that is, the monochromatic cross hatch is clearly visible. The same applies to the case of red.

Focus adjustment will be described taking the case of blue as an example. As shown in FIG. 3, the combination of display patterns is such that green is an all-white raster pattern and blue is a crosshatch inversion pattern. The color overlapping state in the above case is shown in FIG.
Shown in During defocusing of blue (b-1), the white portion of the blue crosshatch inversion pattern becomes narrow due to halation, and the monochromatic crosshatch portion of the background color becomes a thin line. At the time of just focus (b-2), the white part of the blue color becomes wide, and the monochromatic cross hatch-shaped part of the background color becomes a thick line. Therefore, blue focus adjustment may be performed so that the monochromatic cross-hatched portion is as thick as possible. The same applies to the cases of red and green.

As described above, according to the present invention, by combining the auxiliary patterns of crosshatch, crosshatch inversion, and all-white raster that can be generated with a simple configuration, it is possible to easily and easily perform convergence adjustment and focus adjustment. It is possible to perform highly accurate adjustment. In addition, blue can be adjusted by replacing it with a green light emission pattern, which was difficult to adjust due to low luminosity, so that the adjustment accuracy can be greatly improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an image adjustment pattern generating device in one embodiment of the present invention, FIG. 2 is a front view showing individual display of adjustment patterns by the device, and FIG. 3 is a display pattern at the time of convergence adjustment and focus adjustment. FIG. 4 is a block diagram of a conventional crosshatch pattern generator, FIG. 4 is a block diagram of a conventional crosshatch pattern generator, and FIG. It is a front view of the crosshatch which is an example adjustment pattern. 1 ... Synchronous signal, 2 ... Control circuit, 3 ... Cross hatch generation circuit, 4 ... All white raster generation circuit, 5 ... Inversion circuit, 6 ... Selection combination circuit, 7 ... Red cathode, 8 ...
… Green cathode, 9 …… Blue cathode, 10 …… Keyboard.

Claims (1)

(57) [Claims] 1. A means for generating a pattern signal for displaying auxiliary patterns of a crosshatch, a crosshatch inversion, and an all-white raster for adjusting a color television receiver, and the above-mentioned one for each single color in the color television receiver. An image adjustment pattern generation device for generating a high-precision auxiliary pattern for convergence adjustment and focus adjustment, comprising means for applying pattern signals of auxiliary patterns in combination and displaying the combined auxiliary patterns.