KR20060036718A - Method and apparatus for controlling convergence of projection tv - Google Patents

Abstract

According to an aspect of the present invention, a projection TV convergence adjustment device includes a storage unit for storing reference adjustment data for convergence adjustment, a display unit for displaying an adjustment screen for convergence adjustment and a deflection control unit. Camera for measuring the color coordinates and intensity of the R, G, B electron beam, micom for controlling the convergence adjustment displayed on the display unit by converting the color coordinates and intensity values of the electron beam measured by the camera, the control of the microcomputer A convergence adjustment unit for comparing the convergence reference adjustment data previously stored in the storage unit with previous convergence adjustment data according to a signal, and performing correction according to the comparison result; an adjustment value adjusted by the convergence adjustment unit and deflection control unit Video signal input according to The possible signal displayed on the screen, characterized in that it comprises an image processing unit for processing such.

By using the present invention, by adjusting the convergence based on the color coordinate of the electron beam, the convergence can be adjusted independently even in the presence of external light.

Projection TV, Convergence

Description

Convergence control device and method of projection TV {Method and apparatus for controlling convergence of projection TV}

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

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

Figure 3 is a block diagram showing the configuration of the convergence adjustment device of the projection TV according to the present invention

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

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

<Description of Symbols for Major Parts of Drawings>

100: storage unit (EEPROM) 200: microcomputer

300: convergence adjustment unit 301: adjustment control unit

302: adjustment pattern generator 303: RAM

304: interpolation calculator 305: DAC

306: filter (LPF) 400: amplifier

500: deflection control unit 600: image processing unit                 

700: display unit

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

In general, a projection television is a display device that basically expands to a large screen using three CRTs (R .G. B), and synchronizes the CRTs composed of the three CRTs to optimize the display of the projection TV. It is important to match the three colors of R (Red), G (Green), and B (Blue).

The emotional quality of the projection TV is composed of various items such as W / U (White Uniformity), B / U (Bright Uniformity), Convergence, Focus, and Distortion.

Here, convergence means that the R (Red), G (Green), and B (Blue) beams emitted by the electron gun are collected at a point on the screen by the magnetic field of the deflection yoke, but the influence of the abnormality or 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 so that they appear white. When the convergence is missed, abnormally colored lines such as R, G, and B are 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 tubes 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 TV is in the spotlight as a display that meets the needs of a large screen.

Therefore, in order to solve such a problem, a method of automatically adjusting convergence is adopted.

Hereinafter, a configuration of a projection TV according to the prior art will be described with reference to the accompanying drawings.

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

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 tunes / IF (2) demodulates 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 entered through A microcomputer 9 for outputting a control signal according to a command, and a format converter 12 for converting a video signal processed by the chroma processor 11 into a format that can be displayed on a 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 deflector, a deflection control unit 14 for controlling deflection in the deflection unit 16 according to a control signal of the microcomputer 9, and the screen 17 And an automatic color matching controller 15 which adjusts the convergence to be corrected by comparing the detected value detected from the automatic color matching sensor units 18a to 18h installed in a predetermined region of the image 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 voice signal output through the switching unit 3 and controls the tone signal 4 to be output through the corresponding speaker 6.

The video 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.

On the other hand, when an input from an external device such as a PC is selected in addition to the video signal through the antenna 1, when the presentation is performed through the video signal input from the PC, most of the input video signals are still images. If the image is continuously displayed for a predetermined time or more, the PRT constituting the deflection unit 16 and the screen 17 are deteriorated and damaged, thereby performing a function similar to the screen protection function of the PC.

That is, the microcomputer 9 inspects the motion detection resist of the format converter 12 and performs a screen protection function when there is no motion of the video signal for a predetermined time to perform a function of randomly moving letters on the screen. do.

As described above, in conventional projection TVs, the respective electron beams output from three PRTs of R, G, and B are reflected on a mirror and then make an image on 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.

In addition, the projection TV according to the prior art has a problem that an error may occur when the convergence adjustment by the external light by measuring the intensity of the R, G, B electron beam using a sensor for detecting the light to adjust the convergence.

Therefore, the projection TV according to the prior art has been recommended to adjust the convergence in a dark place where no external light exists, and when adjusting the convergence in the presence of external light, image quality reduction due to an error caused by the external light is inevitable. .

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for adjusting convergence of a projection TV that can adjust convergence by measuring color coordinates and intensities of R, G, and B electron beams, and under the influence of external light.

Convergence adjustment apparatus of the projection TV according to the spirit of the present invention for achieving the above object is provided with a storage unit for storing the reference adjustment data for the convergence adjustment, a display unit and a deflection control unit for displaying the adjustment screen for the convergence adjustment In one projection TV, a camera measuring color coordinates and intensities of R, G, and B electron beams, and controlling color convergence and intensity values of the electron beams measured by the camera to sequentially perform convergence adjustment displayed on a display unit. A convergence adjustment unit for comparing the convergence reference adjustment data previously stored in the storage unit with the previous convergence adjustment data according to the control signal of the microcomputer, and performing correction according to the comparison result, and the adjustment value adjusted by the convergence adjustment unit Deflection control of the deflection control unit And an image processor for processing the input image signal to be a displayable signal on the screen.

In addition, the method of adjusting the convergence of the projection TV according to the present invention for achieving the above object comprises the steps of measuring the color coordinates and the intensity of the R, G, B electron beam using a camera, displaying a screen for the convergence adjustment, the If the convergence adjustment screen to be displayed is characterized in that it comprises the step of performing the convergence adjustment sequentially based on the value measured by the camera, and displaying the corrected screen when the convergence adjustment is completed.

The apparatus and method for adjusting convergence of the projection TV according to the present invention has the following effects.

First, by adjusting the convergence based on the color coordinates of the electron beam, the convergence can be adjusted independently even in the presence of external light.

Second, as the convergence adjustment is made accurately, a higher quality image can be displayed.

Third, user satisfaction may be improved by providing higher image quality.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments presented below, and new inventions can be presented by adding, limiting, deleting, adding, and the like within the scope obvious to those skilled in the art. There will be.

3 is a block diagram showing an apparatus for adjusting the convergence of the projection TV according to the present invention, and FIG. 4 is a flowchart illustrating a method for adjusting the convergence of the projection TV according to the present invention.

As shown in FIG. 3, the apparatus for adjusting convergence of the projection TV according to the present invention includes a storage unit 100 for storing reference adjustment data for convergence adjustment, and a display unit 700 for displaying an adjustment screen for convergence adjustment. And a microcomputer controlling the convergence adjustment to be performed according to the color coordinates and the intensity of the R, G, and B electron beams captured by the camera on the convergence adjustment screen displayed on the display unit 700 when the user inputs a convergence adjustment command. 200 and the convergence adjustment unit 200 comparing the convergence reference adjustment data previously stored in the storage unit 100 with previous convergence adjustment data according to the control signal of the microcomputer 200 and performing correction according to the comparison result. And an image scene input according to the adjustment value adjusted by the convergence adjusting unit 200 and the deflection control of the deflection control unit 500. It is configured to include an image processor 600 for processing so that the signal can displayed on a screen.

Here, the convergence adjustment unit 300 inputs a horizontal / vertical synchronization signal from a RAM 303 for storing adjustment data according to an adjustment state before powering off and an image signal input according to a control signal of the microcomputer 200. An adjustment control unit 301 for controlling the adjustment pattern and the cursor to be generated, an adjustment pattern generation unit 302 for generating an adjustment pattern according to the control signal of the adjustment control unit 301, and the adjustment pattern generation unit ( The adjustment point selected by the user in the pattern generated in step 302 is interpolated by receiving the adjustment data previously stored in the storage unit 100 and the adjustment data of the previous state stored in the RAM 303 according to the control signal of the microcomputer 200. The interpolation operation unit 304 for calculating, the D / A converter 305 for converting the data calculated in the interpolation operation unit 304 into analog data, and the data converted in the D / A converter 305 It consists of a filter 306 to output to the image processing unit 600. Here, the storage unit 100 is composed of EEPROM.

Referring to the operation of the convergence adjustment device of the projection TV according to the present invention configured as described above are as follows.

When a user inputs an adjustment command to adjust convergence, an adjustment pattern for adjusting convergence is displayed on the display unit 700. At this time, in the convergence adjustment screen, color coordinates and intensities of the R, G, and B electron beams are captured by a camera on the display, and convergence is adjusted according to the color coordinates and intensities captured. When the R, G, B electron beams are scanned at each point of the display, a white coordinate can be obtained.

When external light is present at the point, accurate convergence may be adjusted by subtracting or subtracting the color coordinate of the external light from the color coordinate measured at the point.

A CCD (Charge-Coupled Device) camera or a CMOS camera may be used to measure color coordinates and intensities of the R, G, and B electron beams, and the CCD camera is a device that converts light into electricity so that it can be read. . Since the electricity converted by the CCD is an analog value, it is digitized again through an analog-digital converter (ADC), and the digital image is processed by processing the value.

A large number of light collecting devices are arranged in a CCD, and the light collecting devices form one pixel. In other words, if a digital camera is 3 million pixels, it means that there are 3 million condensing devices in the CCD built into the digital camera.

However, the CCD itself does not distinguish colors, and since only the contrast can be distinguished, a color filter is mounted on the CCD. Depending on the type of color filter, CCD may be classified into a primary color system and a complementary color system.

Complementary Metal Oxide Semiconductor (CMOS) cameras, on the other hand, obtain data through the continuous conversion of incoming light. Also called CIS (Contact Image Sensor), the semiconductor device directly receives the light without using the filter. Recognizing light directly without going through a filter is a glimpse of the future development of CMOS cameras.

The CMOS camera has the advantage of consuming only about 1/100 of the power compared to the CCD camera. (CCD: 2 ~ 5W / CMOS: 20 ~ 50mW) In addition, since all pixels are read separately, there is no blooming effect and parallel transmission It is suitable for fast image storage because it transmits data through. In addition, it is possible to manufacture small products and the production process is very simple.

However, CMOS cameras have disadvantages such as noise, frequent sensor chip size, and inaccurate expression.                     

The camera is formed at four corners of the projection TV to measure color coordinates of R, G, and B electron beams, and adjust convergence according to the color coordinate values. In order to adjust the convergence more precisely, the convergence may be adjusted by installing a camera between the four corners in addition to the four corners. In this case, a total of nine cameras are formed on the screen, which enables more precise convergence adjustment.

A convergence adjustment method of the projection TV according to the present invention configured as described above will be described with reference to FIG.

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

Referring to FIG. 4, first, when it is powered on, it is determined whether a user selects a convergence adjustment command (S101 ˜ S102).

Subsequently, when the convergence adjustment command is selected (S102), the R, G, B electron beams are scanned at each point of the display, and the color coordinates and the intensity of the R, G, B electron beams are measured using a CCD camera or a CMOS camera. (S103). Using the measured color coordinates and the intensity of the electron beam, the microcomputer determines whether the color coordinates and the intensity are reference white coordinates (S104).

Through the determination (S105), if the color coordinates and the intensity are the reference white coordinates, convergence adjustment is completed (S107). The adjusted convergence value is stored (S107) and terminated.

On the other hand, when the color coordinates and the intensity are not the reference white coordinates, the positions of the R, G, and B electron beams are adjusted (S106), and the color coordinates and the intensity values of the R, G, and B that are scanned at each point of the display are displayed using the camera. Measurement is made (S103).

On the basis of the measured value, it is determined whether the color coordinates and the intensity of the electron beam are the reference white coordinates (S104). In the case of the reference white coordinates, convergence adjustment is completed (S107) and the adjustment values are stored (S108).

On the other hand, if the reference white coordinates are not satisfied, the process of re-adjusting the positions of the R, G, and B electron beams is repeated (S106).

As described above, the apparatus and method for adjusting convergence of a projection TV according to the present invention measures color coordinates and intensities of R, G, and B electron beams displayed on a display when a user inputs a convergence adjustment command through a camera, and measures the measured values. Based on the position of the R, G and B electron beams, each point of the display satisfies the white coordinates.

As described above, the apparatus and method for adjusting convergence of the projection TV according to the present invention have the following effects.

First, by adjusting the convergence based on the color coordinates of the electron beam, the convergence can be adjusted independently even in the presence of external light.

Second, as the convergence adjustment is made accurately, a higher quality image can be displayed.

Third, user satisfaction may be improved by providing higher image quality.

Claims (7)

A projection TV having a storage unit for storing reference adjustment data for convergence adjustment, a display unit for displaying an adjustment screen for convergence adjustment, and a deflection control unit, A camera measuring color coordinates and intensities of the R, G, and B electron beams, respectively; A microcomputer controlling the convergence adjustment displayed on the display unit to be sequentially performed by converting the color coordinates and the intensity values of the electron beam measured by the camera; A convergence adjustment unit comparing the convergence reference adjustment data previously stored in the storage unit with previous convergence adjustment data according to the control signal of the microcomputer, and performing correction according to the comparison result; And, And an image processing unit for processing the image signal input according to the adjustment value adjusted by the convergence adjusting unit and the deflection control of the deflection control unit to be a displayable signal on the screen. The method of claim 1, The convergence adjustment unit RAM for storing the adjustment data according to the adjustment state before the power off, An adjustment control unit which receives a horizontal / vertical synchronization signal from an image signal input according to the control signal of the microcomputer and controls an adjustment pattern and a cursor to be generated; An adjustment pattern generator for generating an adjustment pattern according to the control signal of the adjustment controller; An interpolation calculator configured to interpolate the adjustment point selected by the user from the pattern generated by the adjustment pattern generator based on the control signal of the microcomputer and receive the adjustment data previously stored in the storage unit and the adjustment data of the previous state stored in the RAM; A D / A converter for converting data calculated by the interpolation calculator into analog data; And a filter for filtering the data converted by the D / A converter and outputting the filtered data to the image processor. The method of claim 1, And the camera is mounted at four corners of the projection TV. The method of claim 1, The camera is a convergence adjustment device of the projection TV, characterized in that formed between each corner in addition to the four corners of the projection TV. Measuring color coordinates and intensities of the R, G, and B electron beams using a camera; Displaying a screen for adjusting convergence; Sequentially performing convergence adjustment based on a value measured by the camera when the displayed convergence adjustment screen is displayed; And And displaying the corrected screen when the convergence adjustment is completed. The method of claim 5, The performing of the convergence adjustment may include adjusting the color coordinate values of the previously measured electron beam to satisfy the reference white coordinates. The method of claim 5, In the step of performing the convergence adjustment, When the external light is introduced, the convergence adjustment method of the projection TV, characterized in that for adjusting the convergence except for the color coordinates of the external light.

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