JP2502516B2 - Convergence automatic adjustment device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic convergence adjustment device that automatically and quickly adjusts convergence 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, a radius of curvature of the shadow mask is larger than a distance between the deflection center and the shadow mask, and thus color shift occurs. Further, in a projection type color television receiver that magnifies and projects by using three picture tubes that emit three primary colors, since the incident angle of the picture tube to the screen is different for each picture tube, a color shift occurs on the screen. Occurs.

Superimposition of these three primary colors, so-called convergence, is performed by making a correction waveform synchronized with the horizontal and vertical scanning periods and adjusting this waveform. A method of digitally creating a convergence correction waveform has been proposed as a method of performing highly accurate convergence on the entire screen.

Hereinafter, the configuration and adjustment of the example of the digital convergence described above will be described. 5 and 6
The figure is a block diagram of digital convergence and a pattern diagram for correction.

First, when a synchronizing signal is applied to the terminal 22, the control circuit 23
The correction pattern generating circuit 24 displays a correction pattern (cross hatch pattern or the like) on the screen as shown in FIG. Each intersection of the grids of this correction pattern is used as an adjustment point.

Next, the adjustment point is selected with the cursor key of the control panel 26, and the address is stored in the cursor counter 27.

One frame that outputs this and the address of each adjustment point sequentially
When the address of the memory control counter 29 matches, the match detection circuit 28 outputs a match signal. Add it to the cursor generation circuit 31, generate a cursor signal corresponding to the memory address of the cursor counter, add it with the signal of the correction pattern generation circuit 24 by the addition circuit 25, and add the correction pattern and the selected adjustment point on the screen. And a cursor that indicates are superimposed.

Next, the color to be corrected is input from the control panel 26, and the desired correction amount is input to the reversible counter 32 while looking at the cursor on the screen showing the selected adjustment point. The output data is written to the output address of the address multiplexer 30 indicating the selected adjustment point of the one-frame memory 34 via the data multiplexer 33.

Further, since there is only the correction amount data of each adjustment point in the 1-frame memory 34, the interpolation calculation circuit 35 obtains the correction amount for each scanning line between the adjustment points in the vertical direction. The output signal is D /
The signal is converted into an analog signal by the A conversion circuit 36, smoothed and widened by a low pass filter (LPF) 37, and then supplied to the convergence coil.

The above means is repeated for each color to perform convergence correction for red, green and blue.

Problems to be Solved by the Invention However, the adjustment method of the digital convergence device configured as described above is such that the adjuster visually judges the state of color overlap and increases or decreases the correction amount by manual key input operation. Firstly, there are individual differences among the adjusters, and secondly, the number of adjustments is 9 in the correction pattern example of FIG.
(Horizontal direction) x 7 (vertical direction) x 2 (horizontal and vertical) x 2
(Red and blue based on green as standard) = 252 times, and there was a problem that adjustment took a lot of time.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a convergence automatic adjustment device that can perform convergence adjustment automatically and easily in a short time and does not cause a difference in adjustment by an adjuster. is there.

Means for Solving the Problems In order to achieve the above object, the convergence automatic adjustment device of the present invention uses a large area dot as a correction pattern, and optically receives the dot position information with a high resolution television camera. In order to superimpose the green dots, the red dots, and the blue dots, feedback control using a microcomputer is provided. In addition, the position of the TV camera that anticipates each adjustment point can be set only by manual positioning of the four corners in the periphery.

Effect The present invention enables automation of convergence adjustment by the above configuration, and in addition, shortens the adjustment time,
Achieve higher adjustment accuracy.

Embodiment One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention, FIG. 2 is a polka dot pattern for calculating an adjustment point position in this apparatus, and FIG. 3 is a large area dot correction pattern in this apparatus.

First, when a sync signal is applied to the sync signal input terminal 1 of FIG. 1, the polka dot pattern generation circuit 3 produces a polka dot pattern (monochrome green) as shown in FIG. 2 on the screen through the control circuit 2. It is projected.

The adjuster moves the television camera 6 in order from the reference point a at the upper left of the four dots in the peripheral corner of the polka dot pattern, confirms that the reference point a is in the center of the field of view of the television camera 6, and confirms that the reference point a of the control panel is displayed. Press the confirmation key 5. Position information of the TV camera 6 for looking into the reference point a by this operation (vertical tilt amount, horizontal tilt amount)
That is, the position address of the reference point a is stored in the adjustment point address memory 9 via the television camera drive control CPU 8. The position addresses for the reference points b, c, d are stored in the adjustment point address memory 9 in the same manner as described above.

When the storage of the position address for the reference points a to d in the adjustment point address memory 9 is completed, the reference points a to d are set.
The position address data of is transferred from the adjustment point address memory 9 to the arithmetic / control CPU 10, and the position addresses of the adjustment points other than the above-mentioned four adjustment points (reference points a to d) are calculated and all the adjustment points are calculated. The position address of is stored in the adjustment point address memory 9.

Next, the polka dot pattern disappears in response to a control signal from the arithmetic / control CPU 10, and passes through the control circuit 2 and the pattern position switching circuit 11 to the first adjustment point (upper left) by the correction pattern generation circuit 4 to the third, A large area polka dot a20 is displayed as shown in Fig. 4. At this time, the television camera 6 is driven by the television camera drive control CPU 8 and the television camera drive device 7 to a position where the first adjustment point is expected according to the position data read from the adjustment point address memory 9, and as shown in FIG. The magnification is set so that the field of view is twice as large as that of a large area dot.

Next, the television camera 6 and the dot centroid calculation circuit 12 first obtain the address of the green dot and store it in the dot address memory 13. Further, in response to a control signal from the arithmetic / control CPU 10, it switches to a red dot via the color switching circuit 14. Therefore, similarly to the case of the green dot, the position address of the red dot at the adjustment point is obtained and stored in the dot address memory 13. Next, the position address of the green dot and the red dot is transferred to the difference circuit 15, where the difference in position of the red dot with respect to the green dot is detected, and the convergence correction amount is calculated from the color shift amount, and the correction amount is calculated. Are stored in the 1-frame memory 16. As for the blue dot,
The convergence correction amount is stored in the one-frame memory 16 as in the case of the red dot.

When the calculation of the convergence correction amount for the color shift of the first adjustment point is completed as described above, the second
Position address of second adjustment point is for TV camera drive control
The data is transferred to the CPU8, and the convergence correction amount for color misregistration is calculated in the same manner as the first adjustment point.
The correction amount is stored in the one-frame memory 16. In the same manner, the convergence correction amount for all adjustment points is calculated.

Further, since the 1-frame memory 16 stores only the correction amount data at each adjustment point obtained as described above, the correction amount for each scanning line between the adjustment points in the vertical direction is calculated by the interpolation circuit 17. Desired. The output signal is D / A conversion circuit 1
Converted to analog signal at 8 and low pass filter (LPF)
After being smoothed and amplified at 19, it is supplied to the convergence coil.

Thereby, convergence correction is performed over the front surface.

Next, for each adjustment point corrected by the above procedure, the dot size of the adjustment point is set to the large area polka dot b21 of FIG.
, And set the magnification so that the field of view of the TV camera 6 is also 1/2, and again perform the same procedure for detecting the amount of color misregistration,
The adjustment accuracy is improved by repeating the system of calculating the correction amount and supplying the correction waveform to the convergence coil.

In this way, it is possible to automatically perform the convergence adjustment by detecting the deviation amount and performing the feedback correction to the convergence coil for all the adjustment points.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to automate convergence adjustment including dynamic convergence, and it is possible to solve the complexity of conventional keyboard and manual adjustment by visual observation. Moreover, it is possible to improve the reproducibility and accuracy of the adjustment even with respect to external factors such as ambient external light. Can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an automatic convergence adjusting apparatus according to an embodiment of the present invention, FIG. 2 is a pattern diagram of a polka dot for position calculation at the adjustment point, and FIG. 3 is a large area polka which is a correction pattern thereof. FIG. 4 is a pattern diagram showing dots and adjustment points, FIG. 4 is a pattern diagram showing a relative relationship between the large area polka dots and the field of view of the television camera, and FIG. 5 is a block diagram of a conventional digital convergence device by manual adjustment. FIG. 6 is a pattern diagram of a crosshatch used for the convergence adjustment. 1 ... Sync signal input terminal, 2 ... Control circuit, 3 ... Polka dot generation circuit, 4 ... Pattern generation circuit, 5 ... Control panel key, 6 ... TV camera, 7 ... TV camera drive device, 8: TV camera drive control CP
U, 9 ... Adjustment point address memory, 10 ... Calculation / control C
PU, 11 …… Pattern position switching circuit, 12 …… Dot centroid calculation circuit, 14 …… Color switching circuit, 15 …… Differential circuit, 16 …… 1
Frame memory, 17 ... Interpolation calculation circuit, 18 ... D / A conversion circuit, 19 ... LPF.

Claims (1)

(57) [Claims] 1. A pattern generating means for switching and displaying convergence adjusting dot patterns of different sizes, and position information of the dot patterns of each size are optically received, and the dot pattern The image pickup means is provided with an image pickup means for changing the visual field size in association with the changeover, and a recognition judgment means for recognizing and discriminating the positional information of the dot pattern optically received by the image pickup means, and the image pickup means has different dot patterns. An automatic convergence adjustment device characterized by performing image pickup with a different visual field size for each and adjusting the convergence in a plurality of dot patterns.