JPS63199592A - Convergence device - Google Patents

Abstract

PURPOSE:To attain the automatic adjustment of static convergence by generating auxiliary patterns for static convergence automatic adjustment and adjusting a current flowing in a static convergence coil in accordance with the quantity of light which a couple of optical sensors provided in positions corresponding to the auxiliary patterns have received. CONSTITUTION:If a synchronizing signal is inputted to a control circuit 3, an auxiliary pattern generator 8 provided apart from a convergence correction pattern generator 4 projects the auxiliary patterns for convergence adjustment 18a and 19a in the right and left (or top and bottom) of near the circumscription of an effective area in a screen 20. Firstly, the optical sensors 12 and 13 are provided in positions that the current (i) 21 and 22 flowing in the two optical sensors 12 and 13 are equal. If the auxiliary patterns 18a and 19a fluctuate, the current flowing in the optical sensors fluctuate because they are respectively disposed in reversed directions, whereby errors occur in the current (i) 21 and 22. An error detection circuit 16 detects the errors and an amplifier 10 supplying the current to the convergence coil 11 is controlled to operate the current flowing in the optical sensors 12 and 13 become equal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a static convergence device that can automatically and accurately perform static convergence adjustment for a CRT projection type color display device.

Conventional technology In a projection type color display device that uses three CRTs that emit the three primary colors of red, green, and blue to enlarge and project onto the screen, the incident angle of the CRT to the screen is different from that of the three primary colors of red, green, and blue. Since each CRT is different, color shift occurs on the screen.

The superposition of these red, green, and blue colors, so-called convergence, is achieved by adjusting a correction waveform synchronized with horizontal and vertical scanning.

Static in projection color display equipment
A method of adjusting convergence will be explained with reference to FIGS. 3 and 4.

First, in Figure 3, connect the horizontal and vertical synchronizing signals to terminal 2.
When input from
is generated and displayed on the screen as shown in FIG. 4 via the switch 6 and the video amplifier 6. This chromeno・
The intersection point of the grid at the center of the square 23 is the static convergence adjustment point 24, and the red and green at this adjustment point 24.

The static convergence is adjusted by varying the direct current flowing through the static convergence coil 11 by the amplifier circuit 1o by operating the keys on the control panel 9 shown in FIG. 3 while visually judging the state of blue color overlap. There is.

Problems to be Solved by the Invention However, in conventional CRT projection type color display devices, in addition to convergence shifts due to electrical temperature changes and changes over time, convergence shifts occur due to structural fluctuations, and each time the convergence shift occurs. There is a problem in that the static fist convergence must be readjusted from time to time visually by displaying the correction pattern 23 on the screen.

In view of the above problems, the present invention provides a method for automatically adjusting static convergence.

Means for Solving the Problems The automatic static convergence adjustment device of the present invention includes means for generating an auxiliary pattern for automatic static convergence adjustment in an overscan area outside the video signal (blanking period of the video signal), for example. This auxiliary pattern is superimposed on, for example, a video signal, and a pair of substantially triangular optical sensors that receive color shift information of the auxiliary pattern are provided near the outside of the effective image reception area of the screen (at a position corresponding to the auxiliary pattern). , the static convergence coil current is adjusted so that the current flowing through the pair of optical sensors becomes equal depending on the amount of light received by the pair of optical sensors.

Operation The present invention enables automatic adjustment of static fist convergence with the above-mentioned configuration, and in addition, eliminates the cause of differences in settings by adjusters, and allows highly accurate static convergence adjustment.

EXAMPLE Hereinafter, an example of the present invention will be explained while referring to FIGS. 1 and 2 as rare fish.

FIG. 1 shows an embodiment of a convergence device according to the present invention, and FIG. 2a shows an auxiliary pattern for automatic static convergence adjustment according to an embodiment of the present invention. auxiliary pattern signals 18 and 19 are superimposed on the blanking and vertical blanking periods). FIG. 2 shows auxiliary patterns 18a and 19a based on the optical sensor 12 and auxiliary pattern signals 18 and 19.
When adjusting the convergence of the entire screen, the adjustment cross signal 23 is displayed on the screen using the switch 5, but the auxiliary pattern signals 18 and 19 are used for normal video. When displaying an image, an auxiliary pattern 18a is superimposed on the video signal and is placed at the position shown in the figure.

It is displayed as 19a. Auxiliary pattern signal 18°19
A pair of triangular optical sensors 1 for detecting position information of
2 and 13 are arranged perpendicularly to the auxiliary patterns 188, 19& and in opposite directions.

The operation of detecting the position information of the auxiliary pattern signal and returning it to the initial position will be briefly described.

Auxiliary pattern 18a that is received by optical sensors 12 and 13,
19a is the auxiliary pattern 18a as shown in FIG.
, 19a moves, the current flowing through the optical sensor v12°13 changes.

Initially, the current 121. flowing through the two optical sensors 12, 13.
The optical sensors 12 and 13 are installed at the same position. When the auxiliary butterflies 18a and 19a change, the optical sensor 12
, 13 are arranged in opposite directions, so the current flowing therein fluctuates.

That is, a difference occurs between the currents i21 and 22. Then, the error detection circuit 16 detects the difference between the currents i21 and 22, controls the amplifier 10i that supplies the current to the convergence coil 11, and controls the currents 21 and 2 flowing to the optical sensors 12 and 13.
It operates so that 2 are equal.

The operation of automatically adjusting static convergence will be explained with reference to FIG.

When a synchronization signal is input to the control circuit 3 shown in FIG.
An auxiliary pattern generator 8 provided separately from the auxiliary pattern generator 8 generates an auxiliary pattern 18a for convergence adjustment as shown in FIG.
19a is projected on the left and right (or up and down) near the outside of the effective area of the screen 20, the auxiliary pattern signal 18
．． The color No. 19 is converted into a single green auxiliary pattern jBa19a by the color switching circuit 17 and displayed. This auxiliary pattern 18
d.

A current 21.19a flows through the optical sensor 12.13.
Move the optical sensor height to 12° and 13° so that 22 becomes equal and fix it.

Next, the color switching circuit 17 selects the red monochromatic auxiliary pattern 1.
8a and 19a on the screen 2o, and the optical sensor 12
, 13 are equal to the currents 21 and 13 flowing through the red convergence coil 11.
Automatically adjust.

As for the blue auxiliary patterns 18a and 19a, the current 21. which flows through the optical sensors 12 and 13 is similar to the case of the red color.
The error detection circuit 16 automatically adjusts the current flowing through the blue convergence coil 11 so that 22 becomes equal.

In the manner described above, the static convergence deviations of red, green, and blue can be automatically adjusted.

Effects of the Invention As described above, the present invention enables automatic adjustment of static convergence deviation in a projection type television receiver.
In addition, highly accurate adjustment is possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a convergence device according to the present invention, FIG. 2a is a waveform diagram of an auxiliary pattern signal for convergence correction according to the present invention, FIG.
The figure is a block diagram of a conventional convergence device, and Figure 4 is a front view of the display for explaining the operation of Figure 3. 8... Auxiliary pattern generator, 12.13...
... Optical sensor, 14.15 ... Detection circuit, 1
6...Error detection circuit, 11...Convergence coil. Name of agent: Patent attorney Toshio Nakao and 1 other person
2 Figure '8・''''-Complementary rib'''
-'Bu Omanpu 5 Raishi Taibu 8 72, Me 3---Kan de Tsubu

Claims (1)

[Claims] A means for generating an auxiliary pattern for automatic adjustment of static convergence, and two pairs of substantially triangular shaped optical sensors for detecting the light of the auxiliary pattern for adjustment are provided on the left and right or upper and lower sides of the screen, and the pair of optical sensors A convergence device that automatically adjusts static convergence deviation by changing the current flowing through a static convergence coil so that the current flowing is equal depending on the amount of light received.