JPH03236681A - Television receiver - Google Patents

Abstract

PURPOSE:To prevent color slurring of a display pattern by correcting a drive signal of a deflection yoke based on a selected correction data. CONSTITUTION:A horizontal synchronizing signal SH is separated from an input video signal, the result is inputted to a counter circuit 10, a horizontal scanning frequency is detected and the result of detection is outputted to a control circuit 14, transferred to a memory 18 and a resistoration correction data is selected among resistoration correction data. The selected correction data is outputted to a resistoration correction circuit 12, resistoration correction deflection yokes 26R, 26B, 26G are driven based on the correction data. Thus, the resistoration is corrected by a correction in response to the horizontal scanning frequency of the input video signal and a pattern picture without color slurring is obtained.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Industrial field of application B. Overview of the invention C. Conventional technology Problems to be solved by the invention E. Means for solving the problems (Fig. 1) 1.
Figure) G Embodiment (Figures 1 to 5) H Effects of the Invention A Industrial Field of Application The present invention relates to a television device, and particularly to a television device that switches and displays a plurality of video signals having different horizontal scanning frequencies. It is suitable for application to.

B. Summary of the Invention The present invention provides a television device that adjusts the horizontal scanning frequency by selectively using correction data corresponding to the horizontal scanning frequency from a plurality of correction data stored in a memory circuit to drive a deflection yoke. Even when switching and displaying input video signals with greatly different values, it is possible to prevent color shift on the display screen.

C. Prior Art Conventionally, in television devices, convergence was adjusted based on correction data stored in a memory circuit. proposed (Unexamined Japanese Patent Publication No. 1983)
-215887).

According to this method, convergence can be adjusted with high accuracy simply by setting the correction data to a predetermined value.

D Problems to be Solved by the Invention By the way, it would be convenient if one television device could be connected to equipment other than video equipment, such as a computer, and display images.

However, in such equipment, the horizontal scanning frequency may be different from the standard video signal.

Therefore, in order to be able to connect to all such devices, the horizontal scanning frequency must currently be 15-75 (
It is necessary to be able to display video signals of kHz (kHz).

However, in conventional television equipment, convergence can only be corrected within the horizontal scanning frequency range of about 15 to 30 (kHz), and when the horizontal frequency differs greatly, the convergence shifts and colors appear in the displayed image. There was a problem with misalignment.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a television device that can prevent color shift even when displaying images with widely different horizontal scanning frequencies.

E Means for Solving the Problem In order to solve the problem, the present invention provides a memory means 1 that stores correction data for each horizontal scanning frequency band.
8, frequency detection means 10 for detecting the horizontal scanning frequency of the input video signal, and based on the detection result of the frequency detection means 10, from the correction data stored in the memory means 18, according to the horizontal scanning frequency of the input video signal. and a data selection means 14 for selecting the corrected correction data, and a deflection yoke 26R226 based on the correction data selected by the data selection means 14.
A deflection control means 12 for correcting the drive signals of B and 26G is provided.

1 action If the horizontal scanning frequency of the input video signal is detected, and correction data corresponding to the horizontal scanning frequency of the input video signal is selected to correct the drive signals of the deflection yokes 26R, 26B, and 26G,
Even if the horizontal scanning frequency of the input video signal changes, it can be corrected with a correction amount according to the horizontal scanning frequency, and color shift can be prevented.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, l indicates the projector as a whole;
A display screen is formed on the screen 2.

That is, in the projector 1, each input video signal is separated into red, blue, and green color signals, and then the cathode ray tubes 4R14B and 4G are driven by each color signal.

Furthermore, each cathode ray tube 4R is equipped with projection lenses 6R, 6B, and 6G.
The images formed on 14B and 4G are projected onto the screen 2, thereby forming a display image of the input video signal on the screen 2.

Furthermore, in the projector I, the horizontal synchronization signal SN and the vertical synchronization signal Sv are separated from the human video signal, the horizontal synchronization signal Set is given to the counter circuit 10, and the horizontal synchronization signal SH and the vertical synchronization signal Sv are sent to the registration correction circuit 12. Output to.

The counter circuit 10 detects the frequency of the horizontal synchronization signal SN and outputs the detection result to the control circuit 14.

The control circuit 14 receives registration correction data (hereinafter referred to as registration correction data) held in the registration correction circuit 12 in response to the operation of an initial setting operator (not shown) operated at the time of installation. ), the registration correction data stored in the backup memory circuit 16 is transferred to the memory circuit 18.

That is, as shown in FIG. 2, the backup memory circuit 16 divides the memory space into eight areas M1 to M8,
During factory adjustment, registration correction data is stored in each area Ml-M8.

Similarly, the memory circuit 18 divides the memory space into eight areas Ml.
The registration correction data divided into ~M8 and stored in the backup memory circuit 16 are divided into corresponding areas Ml.
- Store in M8.

Here, the first region Ml has a frequency of 15 to 22.5 (kk
] with a horizontal scanning frequency of 18.75 (k
) fz)), whereas the second area M2 stores the horizontal scanning frequency 26.25 ( Registration correction data when displaying a video signal (kHz) is stored.

Similarly, the third region M3 has a frequency of 30 to 37.5 (
horizontal scanning frequency 33.kl-1x).
The fourth region M4 has a horizontal scanning frequency of 41.25 (kHz) with a center frequency of 37.5 to 45 [kHz].
) registration correction data is stored.

Furthermore, the fifth and sixth regions M5 and M6 have frequencies of 45 to 52.5 (kHz) and 52.5 to 60 [kHz], respectively.
Horizontal scanning frequency with a center frequency of 48.75 kHz
(kHz) and 56.25 (kHz), and the seventh and eighth regions M7 and M8 have frequencies of 60 to 67.5 (kHz) and 67.5 to 75 (kHz), respectively. The horizontal scanning frequency consisting of the center frequency is 63.75 [kHz] and 71.25 (kH
z) registration correction data is stored.

Thus, in the projector I, the horizontal scanning frequency band 15 to 75 (kHz) is divided into eight parts, and the registration correction data for the center frequency of each divided band is stored in the memory circuit 16, and the registration correction data is stored in the memory circuit 16. Data is transferred to memory circuit 18.

On the other hand, the control circuit 14 controls the third
Execute the processing procedure shown in the figure.

That is, the control circuit 14 moves from step SPI to step SP2 and takes in the detection result of the counter circuit 10.

Subsequently, the control circuit 14 moves to step SP3, detects the registration correction data stored in the registration correction circuit 12, and determines whether it is necessary to switch this registration correction data.

When the projector 1 is installed, the initial settings are operated to adjust the registration correction circuit 1.
Since the registration correction data held in 2 has been cleared, an affirmative result is obtained in step SP3, and the control circuit 14 moves to step SP4 and writes the registration correction data according to the detection result of the counter circuit IO. select.

That is, when a detection result for a frequency of 15 to 22.5 (k) tz) is obtained, the registration correction data stored in the first area M1 is selected; If the detection result is obtained, the registration correction data stored in the second area M2 is selected.

Further, if a detection result of frequencies 30 to 37.5 (k) is obtained, the registration correction data stored in the third area M3 is transferred to frequencies 37.5 to 45 (k H
z), the registration correction data stored in the fourth area M4 is selected.

On the other hand, frequencies of 45 to 52.5 (kHz) and 5
If a detection result of 2.5 to 60 (kl(z)) is obtained, select the registration correction data stored in the fifth and sixth areas M5 and M6, respectively, and set the frequency to 60.
When detection results of ~67.5 [k] and 67.5 to 75 [k] are obtained, the seventh and eighth regions M
7 and M8 are selected.

Subsequently, the control circuit 14 moves to step SP5 and outputs the selected registration correction data to the attenuation circuit 20 of the registration correction circuit 12, and then moves to step SP6 to end the processing procedure.

As a result, the registration correction circuit 12 uses the attenuation circuit 20 to generate sawtooth wave, parabolic, and sine wave basic correction signals generated by the basic waveform generation circuit 22 based on the horizontal synchronization signal S and the vertical synchronization signal Sv. After attenuating each in accordance with the registration correction data, they are added together and output to the drive circuit 24.

Further, the registration correction circuit 12 includes the drive circuit 2
Deflection yokes 26R, 26B, 26 for registration correction attached to each cathode ray tube 4R14B, 4G in 4
G is driven, thereby correcting the registration according to the registration correction data.

Thus, the horizontal scanning frequency band 15-75 (kHz)
By dividing the frequency into eight bands each having a frequency of 7.5 (k) Misalignment can be effectively prevented.

On the other hand, when the projector 1 starts operating again after stopping its operation, the registration correction circuit 12 has no control over the previous control! The registration correction data selected by the a circuit 14 is held.

Therefore, in this case, the control circuit 14 detects the registration correction data stored in the registration correction circuit 12 in step SP3, and when the detection result of the counter circuit 10 differs with respect to the band of the registration correction data, It is determined that it is necessary to switch the registration correction data, and the process moves to step SP4.

Thereby, the control circuit 14 selects the registration correction data according to the horizontal scanning frequency of the input video signal, and then moves to step SP5 to update the registration correction data stored in the registration correction circuit 12.

In this way, when the horizontal scanning frequency of the input video signal changes significantly, the registration correction amount can be changed by switching the registration correction data.
Color shift can be prevented.

On the other hand, when the detection result of the counter circuit IO falls within the band of the registration correction data stored in the registration correction circuit 12, the control circuit 14 determines that there is no need to switch the registration correction data in step SP3. Then, the process moves to step SP6 and ends the processing procedure.

In this way, the horizontal scanning frequency band is divided, registration correction data is held for each divided band, and
By selecting the relevant registration correction data and switching the registration correction amount according to the horizontal scanning frequency of the input video signal, it is possible to correct the registration with high accuracy even when the horizontal scanning frequency of the input video signal differs greatly. can.

Therefore, by connecting to various devices with different horizontal scanning frequencies,
A display image without color shift can be obtained.

Further, when a readjustment operator (not shown) is turned on, the control circuit 14 sequentially updates the registration correction data stored in the registration correction circuit 12 in response to the operation of a predetermined operator.

Thereby, in the projector 1, the registration correction data held in the registration correction circuit 12 can be reset, and the registration adjusted at the factory can be readjusted.

Furthermore, after readjusting the registration, the control circuit 14 controls, when an update operator (not shown) is turned on.
Based on the readjustment result, the registration correction data stored in the memory circuit 18 is reset.

That is, as shown in FIG. 4, at the time of readjustment, registration correction data with the same content is stored in each area M1 to M8 of the memory circuit 18 and the backup memory circuit 16. )), when the readjustment is completed, the readjusted registration correction data is stored in the corresponding area of the memory circuit 18 (in this case, the area M3) (FIG. 4(B)), whereby the wI area M3 is Reset the registration correction data.

Here, each of the areas Ml-M8 of the memory circuit 18 and the backup memory circuit 16 will be explained using registration correction data related to centering among the registration correction data as a representative.

Furthermore, the control circuit 14 detects difference data between the updated registration correction data and the corresponding registration correction data stored in the backup memory circuit 16 (in this case, the value is -1O), and only the difference data remains. By updating the registration correction data stored in areas M1, M2, M4 to M8 (fourth
(C)), the registration correction data for areas M1, M2, M4 to M8 are reset.

In this way, the registration correction data can be reset for all bands using one type of input video signal, and the readjustment work can be simplified accordingly.

In fact, in this type of projector 1, during transportation,
The holding positions of the projection lenses 6R16B and 6G change, and as a result, the registration adjusted at the factory changes.

Furthermore, since the distance to the screen 2 differs depending on the installation location, it is necessary to adjust the focus, and the registration will also change in this case.

Therefore, when installing projector 1, it is necessary to actually display the image and readjust the registration. In this case, if the registration was readjusted for each of the eight bands, the adjustment work would be complicated. become.

However, since this type of registration error depends on the optical system, unlike registration using the horizontal scanning frequency, it is possible to reset the registration correction data stored in each area M1 to M8 by the same amount. , the registration can be readjusted for all registration correction data.

Therefore, as in this embodiment, by readjusting the registration correction data for one band and then readjusting the remaining registration correction data based on the readjustment result, the readjustment work is simplified and A display image without color shift can be obtained.

Furthermore, in this embodiment, a backup memory circuit 16 is provided separately from the memory circuit 18, and registration correction data at the time of factory adjustment is stored in the backup memory circuit 16. When something goes wrong, etc., the relevant backup memory times! The initial state can be restored based on the registration correction data stored in 16.

Therefore, readjustment work can be simplified accordingly.

Furthermore, even if the user accidentally manipulates the registration, the original state can be restored.

Thus, in this embodiment, the memory circuit 18 constitutes a memory means for storing correction data for each horizontal scanning frequency band, whereas the counter circuit 10 constitutes a frequency detection means for detecting the horizontal scanning frequency of an input video signal. Configure.

Further, the control circuit 14 constitutes data selection means for selecting correction data corresponding to the horizontal scanning frequency of the input video signal from among the correction data stored in the memory means based on the detection result of the frequency detection means. , the registration correction circuit 12 adjusts the deflection yokes 26R126B and 26G based on the correction data selected by the data selection means.
A deflection control means is configured to correct the drive signal of.

In the above configuration, the input video signal is the horizontal synchronization signal SN
is separated, and the horizontal synchronization signal S is separated. is the counter circuit lO
The horizontal scanning frequency of the input video signal is thereby detected.

The detection result of the horizontal scanning frequency is output to the control circuit 14, where registration correction data corresponding to the horizontal scanning frequency of the input video signal is selected from among the registration correction data transferred to the memory circuit 18. .

The selected registration correction data is output to the registration correction circuit 12, and the registration correction deflection yokes 26R126B and 26G are driven based on the registration correction data.

Thereby, the registration is corrected by the correction amount according to the horizontal scanning frequency of the input video signal, and a display image without color shift can be obtained.

According to the above configuration, by correcting the registration by selecting registration correction data prepared in advance for each frequency band according to the horizontal scanning frequency of the input video signal, the horizontal scanning frequency can be greatly changed. Also, the registration can be reliably corrected, and thereby a display image without color shift can be obtained even when the horizontal scanning frequencies are greatly different.

In the above-described embodiment, a case has been described in which the horizontal scanning frequency is divided into eight bands to correct the registration. However, the present invention is not limited to this, and the registration is corrected by dividing the horizontal scanning frequency into various bands as necessary. ration can be corrected.

Further, in the above-described embodiment, a case was described in which the registration correction data is switched according to the horizontal scanning frequency, but the present invention is not limited to this. For example, in addition to the horizontal scanning frequency, the aspect ratio of the input video signal, the display image The registration correction data may be switched depending on the size of the image.

In this case, as shown in FIG. 5, the memory area is divided into three large areas, and each area is subdivided into eight areas.

Furthermore, registration correction data when displaying a large display image is stored in the subdivided areas MLI-ML8 for each frequency band;
8 and MSI-MS 8 store registration correction data for each frequency band when displaying medium and small display images.

In fact, when the size of the displayed image changes, the registration changes slightly accordingly, so when displaying a high-definition television video signal, for example, even a small color shift becomes noticeable.

Therefore, by switching the registration correction data according to the aspect ratio of the input video signal, the size of the displayed image, etc., the quality of the displayed image can be further improved.

Further, in the above-described embodiments, the case where the present invention is applied to a projector has been described, but the present invention is not limited to this, and can be applied to a color television device to correct convergence, thereby eliminating color shift. A display image can be obtained.

Effects of the Invention As described above, according to the present invention, correction data is selected according to the horizontal scanning frequency of the input video signal, and color shift is corrected based on the selected correction data. It is possible to obtain a television device that can display images without color shift even when the scanning frequencies are significantly different.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a projector according to an embodiment of the present invention, FIG. 2 is a route diagram showing its memory circuit, and FIG.
FIG. 4 is a flowchart showing the processing procedure of the control circuit, FIG. 4 is a route diagram for explaining the registration correction data updating operation, and FIG. 5 is a route diagram showing the memory circuit of another embodiment. 1...Projector, 10...Counter circuit, 12...Registration correction amount L
14... Control circuit, 16... Backup memory circuit, 18... Memory circuit, 26
R, 26B, 26G... Deflection yoke for registration correction. Configuration of memory parts 2 6 CB > 0 update 4 Figure 609 - Process flow diagram 3

Claims (1)

[Scope of Claims] Memory means storing correction data for each horizontal scanning frequency band; frequency detection means for detecting the horizontal scanning frequency of the input video signal; data selection means for selecting correction data according to the horizontal scanning frequency of the input video signal from the correction data stored in the means; and driving the deflection yoke based on the correction data selected by the data selection means. A television device comprising: deflection control means for correcting a signal.