JPS63193788A - Static convergence correcting device - Google Patents

Abstract

PURPOSE:To automatize static convergence correction in normal use by storing an elapsed time, a temperature change and a correction current value in a memory supplied by an supplied by an eyesight and a manual input after a power source is charged, and operation-processing initial correction information after the power source is charged in a CPU. CONSTITUTION:If an adjuster operates the correction key of a controller 7, the correction current value which is added to a static convergence coil 10 is added to the static convergence coil 10. The CPU12 instructs by the display function of the controller 7 the adjuster to recognize the correction of static convergence by the correction key and the correction termination at a prescribed intervals. If a termination recognition by the adjuster is returned from the controller 7 to the CPU12, the memory 13 instantaneously stores time information of a timer 14, atmosphere temperature information of a temperature sensor 22 and static convergence correction quantity information of the controller by the instruction of the CPU12. Thus, static convergence correction is automatically executed when the subsequent turning on of the power source in a same setting.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a static convergence correction device that can always maintain the convergence state of a projection type color television receiver in an optimal state only on the receiver main body side.

Conventional technology In projection type color television receivers that use three picture tubes that emit three primary colors to project enlarged images onto a screen, the angle of incidence of the picture tubes on the screen is different for each picture tube, so the colors on the screen are different. Misalignment occurs. The superposition of these three primary colors, so-called convergence, is performed by creating a correction waveform synchronized with the horizontal and vertical scanning cycles and adjusting this waveform.

FIG. 2 is an adjustment of static convergence, which is a color overlapping component on the entire screen of convergence in a projection type color television receiver.

This will be explained using FIG.

First, when a synchronizing signal is applied to the terminal 21 in FIG. 2, a correction pattern (cross switch) signal is created by the control circuit 22 and the correction pattern generation circuit 23, and is displayed on the screen as shown in FIG.

The intersection of the grids at the center of the correction pattern is defined as a static convergence adjustment point 31.

While visually judging the overlapping state of the three primary colors in the adjustment layer 31, the bipolar DC current of the static convergence coil 27Kfit is varied by the DC control circuit 26 through key operations on the control panel 25 shown in FIG. , perform optimal settings for static convergence.

Problems to be Solved by the Invention However, static convergence is subject to fluctuations over time due to various factors. These fluctuation factors include fluctuations in the deflection waveform and convergence correction current due to changes in circuit parameters of the deflection circuit, convergence correction circuit, etc. over time after power is turned on, and changes in the mechanical position of the optical system due to temperature. Among the above-mentioned fluctuation factors, circuit parameter fluctuations can be removed to some extent by temperature compensation measures, but mechanical position fluctuations in the optical system are inevitable, and this is a way to avoid static convergence fluctuations over time. This is a contributing factor.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a static convergence correction device that automates static convergence adjustment after power is turned on and makes it possible to eliminate static convergence fluctuations.

Means for Solving the Problems Based on the above object, the static convergence correction device of the present invention stores in memory the elapsed time after power-on, temperature changes, and correction current values determined by visual inspection and manual input. The subsequent initial correction information is processed by the CPU, and the results are used to automate static convergence correction in normal use.

Operation The present invention enables automatic correction of static convergence only on the receiver main body side with the above configuration.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a static convergence correction device in an embodiment of the present invention. The configuration of this embodiment will be explained below with reference to FIG.

During initial settings, when the power is turned on, the second
With the same configuration as the conventional example shown in the figure, the same crosshatch pattern as shown in FIG. 3 is displayed on the screen of the display. Further, the timer 14 operates simultaneously with the power-on. Timer 14. Information on the static convergence correction current provided by the temperature sensor 11 and the controller 7 is input to the CPU 12 at any time. The correction current value to be applied to the static convergence coil 1o is input by the adjuster by visually determining the convergence deviation from the Kuromeno-Tsuchi pattern shown in FIG. 3 and operating the correction key of the controller 7. The correction information is passed through the D/A conversion circuit 8 and the DC control circuit 9, and then is sent to the static convergence coil 1 as bipolar DC current.
added to o.

At regular intervals, the CPU 12 uses the display function of the controller 7 to instruct the adjuster to correct the static convergence using the correction key and confirm the completion of the correction. When the adjustment operator's confirmation of completion is returned from the controller 7 to the CPU 12, the memory 13 instantaneously stores the time information of the timer 14, the ambient temperature information of the temperature sensor 11, and the static convergence correction amount information of the controller 7 according to instructions from the CPU 12. do. Thereafter, the above operation is repeated according to instructions from the CPU 12, and when the change in the static convergence correction amount for each repetition of the operation converges, the end of the above operation is notified to the adjuster by the display function of the controller 7 as determined by the CPU 12.

The timer 14 will be set when the power is turned on next time with the same settings.
and the information input from the temperature sensor 11 to the CPU 12 and the information content stored in the memory 13 and the CPU
The U12 performs a comparison calculation, and the optimal correction amount information written as a result using two parameters, elapsed time after power-on and temperature, is fed back to the controller 7 at any time, and the static convergence coil 10 is always supplied with the optimal correction current. , automatically performs static convergence correction.

Effects of the Invention As described above, the present invention eliminates static color shift in projection type color television receivers, which is caused not only by electric circuit fluctuation factors but also by various other fluctuation factors, and automatically corrects static convergence. , is possible only on the receiver main body side.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a static convergence correction device according to an embodiment of the present invention, FIG. 2 is a block diagram of a conventional example, and FIG. 3 is a convergence correction pattern diagram common to the conventional example and the present invention. 7... Controller, 8... D/A conversion circuit, 10... Static convergence coil, 11... Temperature sensor, 12...
...CPU, 13...Memory, 14...
··timer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
figure

Claims (1)

[Claims] In a projection type color television receiver, a means for detecting changes over time in parameters that cause misconvergence, such as a deviation in static convergence after power is turned on and a temperature of an optical system mounting part, over time after power is turned on, and storing the detection result in a memory; The present invention further includes means for supplying a correction current to the static convergence yoke according to a change over time in a misconvergence occurrence factor parameter as time elapses after power is turned on, by calculating the time change information of the misconvergence stored in the memory. Characteristic static convergence correction device.