KR20070024271A - Apparatus and method for adjusting convergence of projection tv - Google Patents

Abstract

A convergence adjustment apparatus and method are provided to adjust convergence while a picture is viewed and simplify a user convergence adjustment process using algorithm for compensating for a central area using an adjustment data value of an outer adjustment point so that convergence quality can be improved. A convergence adjustment apparatus comprises a display unit(700) for displaying a picture and a convergence adjustment picture, a main control unit(200) for selecting a convergence adjustment point and controlling user convergence adjustment using a convergence adjustment point of an edge of the display picture when the picture is displayed on the screen center, a convergence control unit(304) for comparing a user adjustment value with a pre-stored convergence reference adjustment data according to a control signal of the main control unit(200) and performs a correction operation using a comparison result, and a video processing unit(600) for correcting a picture to be displayed according to a compensation signal of the convergence control unit(304).

Description

Apparatus and method for adjusting convergence of projection TV}

1 is a block diagram showing a configuration of a general projection TV according to the prior art.

2 is a view showing a convergence adjustment screen of a projection TV according to the prior art.

3 is a block diagram showing an apparatus for adjusting convergence of a projection TV according to the present invention.

4 is a flowchart illustrating a method for adjusting convergence of a projection TV according to the present invention.

5 is a view showing a convergence adjustment screen of the projection TV according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: storage unit 200: main control unit

301: video signal input unit 302: adjustment pattern generator

304: convergence adjustment unit 305: D / A converter

306: filter (LPF) 400: amplifier

500: deflection control unit 600: image processing unit

700: display unit

The present invention relates to a video device, and more particularly, to an apparatus and method for adjusting convergence of a projection TV.

As is well known, a projection TV is an imaging device having a relatively low price while implementing a relatively large screen beyond the limitation of the screen size of a conventional CRT TV.

Projection TVs like these are all-in-one projector systems with projectors, screens and TV tuners all in one set. Recently, CRT type projection TVs are the most attractive display devices for general home theater consumers because they can be purchased at a low price, are easy to install, and have a good image quality.

The size of the screen also varies from 40 inches to 70 inches in recent years, and 4: 3 aspect ratios have been sold a lot, but recently 16: 9 wide screens have become popular. Recently, the projection engine of the projection TV is moving from the CRT method or the LCD method to the DLP method, and the sales price of the DLP projection TV is also decreasing.

The principle of the projection TV is to make an image in the projection engine and to change the angle through the mirror to increase the projection distance so that the image is greatly enlarged on the screen of the projection TV. The screen is made of non-reflective material with a flannel lens. It is structured to diffuse and transmit.

There are CRT, LCD, and DLP engines that produce images in the projection TV. The structure and principle are similar to those of a conventional projector. Of these, in the relatively inexpensive CRT method, CRTs project images on a mirror from three CRTs, 7 inches to 9 inches, red, green, and blue respectively, and are reflected on the mirrors and then projected on the screen of the projection TV. It becomes. The CRT method is a method in which an engine is illuminated by three three-color projectors. In some cases, pixels do not coincide with each other, resulting in color bleeding (convergence), thereby preventing a clear image.

As such, if convergence is not accurate, there may be a problem in readability and color, and in order to solve this problem, a conventional convergence adjusting device is used.

1 is a block diagram showing the configuration of a conventional projection TV according to the prior art, Figure 2 is a view showing a convergence adjustment screen of the projection TV according to the prior art.

As described above, in general, a projection TV is a display device that basically expands to a large screen using three CRTs (R .G. B), and the CRT composed of the three CRTs is optimized to optimize the display of the projection TV. It is important to match the three colors of R (Red), G (Green), and B (Blue).

Convergence refers to the fact that R (Red), G (Green), and B (Blue) beams emitted from the electron gun are collected at a point on the screen by the magnetic field of the deflection yoke. If the beam is not deflected as desired, mis-convergence occurs and color shift occurs on the screen.

In other words, three beams of R, G, and B must be gathered exactly at one point to become white, and when convergence is missed, abnormally colored lines such as R, G, and B will be displayed next to the white line. It acts as a degrading factor.

And, in order to show white, the light projected from each C, R, G, and B tube should be collected in one place. Here, the convergence of R, G, and B light in one place is called automatic convergence. As digital TV broadcasting has recently begun, projection TVs are in the spotlight as displays that meet the needs of large screens.

As shown in FIG. 1, a projection TV according to the related art selects and receives a predetermined frequency band from a broadcast signal input through an antenna 1, and tuner / IF (2) demodulating an intermediate frequency component among the received broadcast signals. ), A switching unit 3 for selecting an output of the tuner / IF or an image signal input from an external device, and a tone received from a corresponding broadcast signal output through the switching unit 3 ), A tone control unit 4 for controlling), an amplifier 5 for amplifying the output of the tone control unit 4 and outputting it through the speaker 6, and a character or icon signal output through the switching unit 3. The chroma processing unit 11 for chroma processing to display on the CRT, the power supply unit 7 for supplying power to each of the internal parts of the system, the power supplied through the power supply unit 7, and the remote controller 8 User request command entered through And a format converter 12 for converting the video signal processed by the chroma processing unit 11 into a format that can be displayed on the screen according to the control signal of the microcomputer 9. And an image amplifier 13 for amplifying the output of the format converter 12, a deflection unit 16 for receiving and deflecting the image signal amplified by the image amplifier 13, and the deflection unit 16. A screen 17 for displaying a video signal deflected by the deflection, a deflection control unit 14 for controlling deflection in the deflection unit 16 according to a control signal of the microcomputer 9, and a screen 17 on the screen 17. The automatic color matching controller 15 is configured to adjust the convergence to be corrected by comparing the detected value detected by the automatic color matching sensor units 18a to 18h installed in the predetermined region with a previously stored reference value.

Referring to the operation of the projection TV according to the prior art configured as described above are as follows.

First, when a user inputs an operation command through the remote controller 8, the power supply unit 7 supplies power to the microcomputer 9 and each unit, and the microcomputer 9 controls the tuner / IF 2. By outputting a signal, the channel desired by the user can be tuned.

In addition, the switching unit 3 selects and outputs either a video signal output from the tuner / IF 2 or a video signal input through an external device PC according to the control signal of the microcomputer 9. The tone control unit 4 receives the audio signal output through the switching unit 3 and controls the tone signal 4 to be output through the corresponding speaker 6.

The image signal selected by the switching unit 3 is input to the chroma processing unit 11 and processed by the control signal of the microcomputer 9 so that forms of characters and icons can be displayed, and the chroma processing unit The video signal processed in (11) is input to the format converter 12, and the format converter 12 adjusts the format so that a constant output can be obtained.

Subsequently, the signal converted by the format converter 12 is amplified by the image amplifier 13, and the amplified image signal is deflected according to the control signal of the deflection controller 14 through the deflection unit 16. And output to the screen 17.

In addition, the automatic color matching control unit 15 receives a detection value detected from the automatic color matching sensor units 18a to 18h mounted in a predetermined area of the screen 17 so as to compensate for the difference from the previously stored reference value. ) Automatically adjusts the convergence by outputting a control signal to the deflection unit 16.

As described above, in conventional projection TVs, the respective electron beams output from three CRTs of R, G, and B are reflected on a mirror, and then an image is made on the screen, so that each electron beam has a different incident angle to the screen. convergence occurs.

The quality is determined by how appropriately the convergence adjustment is made in the projection TV as it has a decisive effect on the miss convergence picture quality. Thus, as shown in Fig. 2, convergence adjustment is performed for nine points.

That is, according to the related art, the adjustment point is set by dividing the adjustment point into nine equal parts of the screen when adjusting the user convergence, and the user must adjust the adjustment points for each of the nine adjustment points. When adjusting the points, the convergence adjustment point is set in a state where the video currently being viewed cannot be viewed.

However, the projection TV according to the related art has a problem of causing inconvenience to the user because the convergence adjustment has to be made for each of nine points as shown in FIG. 2, and the adjustment pattern is used when adjusting the user convergence. Since it is displayed on the entire screen, there is a problem in that the currently viewed image cannot be displayed.

Accordingly, an object of the present invention is to provide an apparatus and method for adjusting convergence of a projection TV, which enables the user to adjust the user convergence and simultaneously view an image currently being viewed.

In accordance with one aspect of the present invention, there is provided an apparatus for adjusting convergence of a projection TV, including: a display unit configured to display an image and a convergence adjusting screen; A main control unit configured to set a convergence adjustment point on the outside of the screen of the display unit and perform a user convergence adjustment using the convergence adjustment point on the outside of the screen while displaying an image in the center of the screen; A convergence adjustment unit comparing the convergence reference adjustment data stored in advance according to the control signal of the main control unit with a user adjustment value and performing correction according to the comparison result; And an image processing unit for processing the input image signal to be displayed on the screen, and correcting the displayed screen according to the correction signal of the convergence adjustment unit.

The main controller calculates a central convergence adjustment value using the convergence adjustment value of the outside of the screen and corrects the corresponding image. The convergence adjustment value at the center of the screen may be an average value of the upper and lower convergence adjustment values of the screen in the case of the horizontal red or blue value, and an average value of the left and right convergence adjustment values of the screen in the case of the vertical red or blue value.

The apparatus further includes a storage unit for storing reference adjustment data for the convergence adjustment and an adjustment pattern generator for generating an adjustment pattern including the convergence adjustment point and providing the adjustment pattern to the display unit.

According to an aspect of the present invention, there is provided a method of adjusting a convergence of a projection TV, the method including: setting a user convergence adjustment point on the outside of a screen and displaying an adjustment pattern; Performing a user convergence adjustment using a convergence adjustment point outside the screen while displaying an image in the center of the screen; And comparing the pre-stored convergence reference adjustment data with the user adjustment value and displaying the corrected image on the screen according to the comparison result.

In addition, the convergence adjustment value of the outside of the screen is calculated to calculate the central convergence adjustment value and correct the corresponding image. The convergence adjustment value at the center of the screen may be an average value of the upper and lower convergence adjustment values of the screen in the case of the horizontal red or blue value, and an average value of the left and right convergence adjustment values of the screen in the case of the vertical red or blue value.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing a convergence adjustment apparatus of a projection TV according to the present invention, Figure 4 is a view showing a convergence adjustment screen of a projection TV according to the present invention.

As shown in the drawing, the present invention includes a storage unit 100, a control unit 200, an image signal input unit 301, an adjustment pattern generator 302, a convergence adjusting unit 304, a D / A converter 305, a filter ( LPF) 306, an amplifier 400, a deflection control unit 500, an image processing unit 600, and a display unit 700.

The storage unit 100 stores reference adjustment data for convergence adjustment. In the present invention, the storage unit may be a RAM, a ROM, an EPROM, or an EEPROM as a conventional memory.

The main control unit 200 sets a convergence adjustment point on the outside of the screen of the display 700, and controls the user convergence adjustment using the convergence adjustment point on the outside of the screen while displaying an image in the center of the screen. In this case, the main controller 200 calculates a central convergence adjustment value by using the convergence adjustment value of the outside of the screen and corrects the corresponding image. The convergence adjustment value at the center of the screen may be an average value of the upper and lower convergence adjustment values of the screen in the case of the horizontal red or blue value, and an average value of the left and right convergence adjustment values of the screen in the case of the vertical red or blue value. The main controller 200 may be a microcomputer such as a CPU or an MPU.

The video signal input unit 301 receives a horizontal / vertical synchronization signal of the video signal from the received broadcast signal. The adjustment pattern generator 302 generates an adjustment pattern including a convergence adjustment point and provides the generated adjustment pattern to the display 700.

The convergence adjustment unit 304 compares the pre-stored convergence reference adjustment data with the user adjustment value according to the control signal of the main controller 200 and performs screen correction according to the comparison result.

The D / A converter 305 converts the data calculated by the convergence adjustment unit 304 into analog data, and the filter (LPF) 306 filters the data converted by the D / A converter 305 to the image. Output to the processing unit 600, the amplifier 400 amplifies the image signal output from the filter 306.

The deflection control unit 500 deflects the video signal. The image processor 600 processes the input image signal according to the adjustment value adjusted by the convergence adjuster and the deflection control of the deflection controller to be displayed on the screen. The display unit 700 displays the deflected image and the convergence adjustment screen.

5 is a flowchart illustrating a method for adjusting convergence of a projection TV according to the present invention.

As shown, the present invention comprises the steps of setting the user convergence adjustment point on the outside of the screen and display the adjustment pattern (S100 ~ S120); Performing a user convergence adjustment by using a convergence adjustment point outside the screen while displaying an image in the center of the screen (S130 to S140); Comparing the previously stored convergence reference adjustment data with the user adjustment value, and displays the corrected image on the screen according to the comparison result (S150 ~ S180). In the step S140, the convergence adjustment value of the center is calculated using the convergence adjustment value of the outside of the screen, and the corresponding image is corrected. In the case of the vertical red or blue values, the average value of the left and right convergence adjustment values of the screen is applied.

Referring to the operation of the present invention configured in this way in more detail as follows.

First, when the user selects an adjustment command to start the convergence adjustment (S100), sets the user convergence adjustment point on the outside of the screen and displays the adjustment pattern (S110 ~ S120).

That is, the video signal input unit 301 receives a horizontal / vertical synchronization signal of the video signal from the received broadcast signal, and the adjustment pattern generator 302 generates an adjustment pattern including a convergence adjustment point to display the display unit 700. To provide. In this case, the main control unit 200 sets a convergence adjustment point on the outside of the screen of the display unit 700.

Thereafter, the user convergence adjustment is performed using the convergence adjustment point on the outside of the screen while displaying an image in the center of the screen (S130 to S140).

In more detail, the main controller 200 controls to perform the user convergence adjustment using eight convergence adjustment points on the outside of the screen while the image is displayed at the center of the display 700.

In this case, the main controller 200 calculates a central convergence adjustment value by using the convergence adjustment value of the outside of the screen and corrects the corresponding image. The convergence adjustment value at the center of the screen may be an average value of the upper and lower convergence adjustment values of the screen in the case of the horizontal red or blue value, and an average value of the left and right convergence adjustment values of the screen in the case of the vertical red or blue value.

That is, as shown in FIG. 4, using eight convergence adjustment points on the outside of the screen, 1) red value convergence compensation is horizontal: (A value + B value) / 2, vertical: (C value + D Calculate the convergence adjustment value at the center of the screen. Similarly, 2) blue value convergence compensation calculates the convergence adjustment value at the center of the screen as horizontal: (A value + B value) / 2 and vertical: (C value + D value) / 2.

In addition, the D / A converter 305 converts the data calculated by the convergence adjustment unit 304 into analog data, and the filter (LPF) 306 filters the data converted by the D / A converter 305 to Output to the image processing unit 600, the amplifier 400 amplifies the image signal output from the filter 306.

Thereafter, the previously stored convergence reference adjustment data is compared with the user adjustment value, and the corrected image is displayed on the screen (S150 to S180).

That is, the convergence adjustment unit 304 compares the convergence reference adjustment data previously stored in the storage unit 100 with the user adjustment value according to the control signal of the main controller 200, and performs screen correction according to the comparison result. In addition, the correction value is stored and the correction is completed.

Thereafter, the deflection control unit 500 deflects the image signal, and the image processing unit 600 processes the image signal input according to the adjustment value adjusted by the convergence adjustment unit and the deflection control of the deflection control unit to be displayed on the screen.

The display unit 700 displays the deflected image and the convergence adjustment screen.

Therefore, in the user convergence adjustment mode, the image being viewed in the center of the screen is displayed and the convergence adjustment point is set at the outside, thereby making it possible to simultaneously view the image while adjusting the user convergence.

In addition, by changing from nine adjustment points to eight adjustment points in the related art and using an algorithm for compensating the center by using the adjustment data values of the outer adjustment points, the user convergence adjustment process is simplified to improve quality.

The image displayed in the center of the screen may be divided into a main screen and a sub-screen separate from the main screen using a picture in picture (PIP) function.

Here, a picture in picture (PIP) refers to a screen having a function of simultaneously displaying a small sub-screen separately from the screen viewed on a television receiver screen, which is similar to a window of a personal computer (PC), which is a screen in a screen ( It is called PIP) function. In televisions with such a function, the background that is the background and the smaller screen are called PIPs.

The apparatus and method for adjusting convergence of a projection TV described above may be applied to a projection TV, a general TV, a monitor, and other video devices, and may be equally applicable to analog TV, digital TV, and satellite TV. In addition, it can of course be applied to all NTSC, PAL, SECAM method.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described embodiments without departing from the spirit of the present invention as claimed in the claims. Anyone skilled in the art can, of course, make various changes and make such changes as fall within the stated claims.

As described above, according to the apparatus and method for adjusting the convergence of the projection TV according to the present invention, the user convergence adjustment is performed by displaying the image being watched at the center of the screen and setting the convergence adjustment point at the outer side in the user convergence adjustment mode. At the same time, it is possible to watch the video, and by changing from 9 adjustment points to 8 adjustment points, and using the algorithm that compensates the center by using the adjustment data value of the outer adjustment point, the user convergence adjustment process is simplified and the quality is improved. Has the effect of improving.

Claims (8)

A display unit displaying an image and a convergence adjustment screen; A main control unit for setting a convergence adjustment point on the outside of the display unit screen, displaying an image in the center of the screen, and controlling user convergence adjustment using the convergence adjustment point on the outside of the screen; A convergence adjustment unit comparing the convergence reference adjustment data stored in advance according to the control signal of the main control unit with a user adjustment value and performing correction according to the comparison result; And an image processing unit for processing the input image signal to be displayed on a screen, and correcting the displayed screen according to the correction signal of the convergence adjusting unit. The method of claim 1, The main fisherman, The convergence adjustment device of the projection TV, characterized in that to calculate the central convergence adjustment value using the convergence adjustment value on the outside of the screen and to correct the image. The method of claim 2, The convergence adjustment value in the center of the screen An average value of the upper and lower convergence adjustment values of the screen in the case of the horizontal red or blue value, and an average value of the left and right convergence adjustment values of the screen in the case of the vertical red or blue value. The method of claim 1, And a storage unit for storing reference adjustment data for the convergence adjustment. The method of claim 1, And an adjustment pattern generator for generating an adjustment pattern including the convergence adjustment point and providing the adjustment pattern to the display unit. If the user selects a convergence adjustment command, displaying an adjustment pattern for setting a convergence adjustment point on the outside of the screen; Performing a user convergence adjustment using a convergence adjustment point outside the screen while displaying an image in the center of the screen; And comparing the pre-stored convergence reference adjustment data with the user adjustment value, and displaying the corrected image on the screen according to the comparison result. The method of claim 6, The convergence adjustment method of the projection TV, characterized in that to calculate the central convergence adjustment value using the convergence adjustment value on the outside of the screen and to correct the image. The method of claim 7, wherein The convergence adjustment value in the center of the screen A method of adjusting the convergence of a projection TV, characterized in that the average value of the upper and lower convergence adjustment value in the case of the horizontal red or blue value, and the average value of the left and right convergence adjustment value in the case of the vertical red or blue value.

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