KR100698118B1 - Display device and method for auto-convergence - Google Patents

Abstract

The present invention relates to a video apparatus and an auto-convergence method thereof, which is adapted to allow a user to watch an image displayed on a video apparatus even during auto convergence. According to an embodiment of the present invention, in performing auto convergence in a video device, if a control signal for performing auto convergence is input after the video device is turned on, muting the displayed image, and performing auto convergence for performing the auto convergence. Black screening an outer region of a display region of the imaging device including a dragon pattern and an overscan region in which an optical sensor is located, and the auto-convergence in a state where the image is displayed on a display region other than the current outer region. It provides an auto-convergence method in an imaging device comprising the step of performing. Therefore, according to the present invention, there is an effect of viewing an image displayed on the display unit of the video device even during auto convergence.

Auto convergence

Description

Display device and method for auto-convergence

1 is a view for explaining auto convergence in a projection TV according to the prior art.

2 is a side view of the projection TV shown in FIG.

3 is a view for explaining auto convergence in a projection TV according to the prior art.

4 is a flowchart for explaining an auto-convergence method in a projection TV according to the prior art.

5 is a block diagram illustrating a video device according to the present invention.

6 is a view illustrating in detail the light sensor and the pattern position detector shown in FIG.

7 and 8 are views for explaining a position calculation method between the pattern for auto convergence and the sensor.

9 and 10 are diagrams for describing the voltage output for the light of the sensor in FIGS. 7 and 8, respectively.

FIG. 11 is a view illustrating an optical sensor and a pattern position detector, a sensor pattern position calculator, and a peripheral circuit for calculating a sensor position in the image device shown in FIG.

12 is a view for explaining output waveforms of a buffer and an inverter among the peripheral circuits shown in FIG. 11;

FIG. 13 is a view for explaining an output waveform after the output waveform shown in FIG. 12 has passed through an amplifier circuit and an addition circuit among the peripheral circuits shown in FIG.

FIG. 14 is a view for explaining the output waveform after the output waveform shown in FIG. 13 passes through the A / D converter among the peripheral circuits shown in FIG.

15 is a diagram for explaining auto convergence adjustment using a reference pattern.

16 to 17 are diagrams for explaining the pattern for auto-convergence when performing auto-convergence according to the present invention.

18 is a view for explaining a black processing method of an overscan portion in a display unit (screen);

19 is a flowchart for explaining an auto-convergence method in an imaging apparatus according to the present invention.

* Explanation of symbols for main parts of drawings *

210: tuner unit 220: intermediate frequency processing unit

230: audio output unit 240: image processing unit

250: deflection circuit portion 260: projector portion

270: display unit 271: light sensor and pattern position detection unit

280: convergence circuit unit 290: control unit

300: sensor pattern position calculation unit

The present invention relates to auto-convergence, and more particularly, to a video apparatus and an auto-convergence method thereof, which are suitable for a user to watch a video of a TV even during auto-convergence.

In general, the projection TV expands the image projected from the CRT using the CRT using the colors of red (R), green (G), and blue (B) through an optical unit including a plurality of reflectors and lenses. It is a device that enables the screen to be enlarged by making it display on a large screen.

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 refers to the fact that R (Red), G (Green), and B (Blue) light emitted from 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, misconvergence occurs and color shift occurs on the screen.

In other words, R, G, and B three lights must be gathered exactly at one point to become white. When misconvergence occurs, abnormally colored lines such as R, G, and B appear next to the white line, which causes deterioration of the screen quality. Acts as.

Therefore, in order to represent white, the light projected by each CRT of R, G, and B must be collected in one place.

The convergence of R, G, and B light in one place is called auto-convergence. With the recent launch of digital TV broadcasting, projection TVs are in the spotlight as displays that meet the needs of large screens.

However, the disadvantage of the projection TV is that the use of each CRT of R, G, and B for large-sized, there is a hassle to match the convergence and there is a fear that the convergence is different when the user uses.

Otherwise, the projected image may not be exactly matched on the screen, thereby degrading the sharpness of the screen.

Therefore, in order to solve this problem, the projection TV is essentially provided with a convergence correction device that adjusts the image projected from each projection tube to exactly match the screen.

In general, a projection TV is factory-converged at the factory. Convergence-corrected projection TVs are used in ordinary homes to generate convergence errors due to environmental changes and surrounding magnetic fields.

Therefore, at home, a convergence correction device can be used to correct the error of convergence.

Hereinafter, auto convergence in a projection TV will be described with reference to the accompanying drawings.

1 is a view showing a TV configuration for explaining the auto-convergence in the projection TV according to the prior art, Figure 2 is a view showing the side of the projection TV shown in FIG.

As shown in FIGS. 1 and 2, the projection TV 100 according to the related art includes a projector 10, an auto-convergence unit 20, an optical sensor 30, a connector 40, a cabinet 50, and a mirror ( 60), the case 70, and the screen 80.

The projector 10 projects an image to the screen 80 through the mirror 60.

The auto convergence unit 20 generates patterns of R, G, and B signals for auto convergence according to the control signal, and performs auto convergence according to the pattern detected through the optical sensor 30.

The optical sensors 30a, 30b, 30c, 30d, 30e, 30f, 30g, and 30h: 30 are mounted on the back of the screen 80 so as not to be exposed to the general consumer, and detect the pattern signals of the R, G, and B signals.

The connectors 40a, 40b, 40c, 40d, 40e, 40f, 40g, and 40h are the signal lines for transmitting the signal detected by the optical sensor 30 to the auto convergence unit 20.

The cabinet 50 attaches the optical sensor 30 and the connector 40.

The mirror 60 reflects the image projected from the projector 10 onto the screen 80.

The screen 80 displays an image from the projector 10 mirrored in the mirror 60.

3 is a view for explaining auto convergence in the projection TV according to the prior art.

As shown in FIG. 3, when the user performs auto convergence, the auto convergence pattern 110 is displayed in a predetermined area of the display area 120, and the auto convergence pattern ( The optical sensors 30 detect the 110 and perform auto convergence according to the detected pattern. This will be described in more detail with reference to FIG. 4.

4 is a flowchart for explaining an auto-convergence method in a projection TV according to the prior art.

The auto convergence method in the projection TV according to the prior art determines whether a control signal (for example, through a remote controller) for performing auto convergence is input from a user after the TV is turned on (S10).

If it is determined that the control signal is not input (S10), a guide message requesting to input a control command for performing auto convergence is again displayed on the display area (S20).

However, when the determination result (S10) control signal is properly input, the image being displayed is muted (S30).

Subsequently, the external light of the projection TV is checked to determine whether the external light is not suitable for performing auto convergence (S40). This is to prevent an error of the optical sensor when performing auto convergence.

As a result of determination (S40), if it is too bright to perform auto convergence, a guide message requesting input of a control signal for darkening the ambient light and then adjusting it is displayed on the display area (S50).

However, if it is determined that the external light is not particularly bright (S40), color matching for each of R, G, and B is executed (S60), and auto-convergence for color matching is performed (S70) in comparison with the factory adjustment state.

Subsequently, when auto convergence ends, the process returns to the initial screen (S80).

However, in the convergence correction of the conventional projection TV, in order to prevent an error of the optical sensor when auto convergence is performed, only signal light (auto convergence pattern) for performing auto convergence is generated, and the display area of the TV is displayed. By unmuting the displayed image unconditionally, there is a problem that the user cannot watch the image during auto convergence.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a video device and an auto-convergence method thereof, which is suitable for a user to watch an image displayed on a video device even during auto convergence.

In order to achieve the above object, the present invention provides a video device, a display unit for displaying an image, having a light sensor and a pattern position calculation unit for calculating the position between the auto-convergence pattern and the optical sensor and the auto-convergence pattern; A convergence circuit unit generating a signal pattern for auto-convergence in the display unit, and performing auto-convergence according to a pattern detected by the optical sensor, a pattern signal for auto-convergence in the imaging device, the optical sensor, A black screen process is performed on the outer portion of the display unit during auto-convergence according to a sensor pattern position calculating unit detecting a sensor position from the pattern position calculating unit and an optical sensor position on the display unit calculated by the sensor pattern position calculating unit, In the display area other than the black screen, the image is It provides a video device characterized in that it comprises a control unit for controlling to display.

The video device preferably further comprises a tuner for tuning the broadcast signal, an image processor for scaling the broadcast signal, and a projector for projecting the image onto the display.

Preferably, the image processor performs the black screen processing according to the control signal of the controller.

In this case, when the image is displayed in the display unit region other than the black screen, the controller is configured to display the picture in a picture format.

In addition, the photosensor and the pattern position calculation unit is preferably formed in the area between the outermost portion of the display unit and the black screen.

In addition, the optical sensor is preferably composed of at least two in order to obtain distance information on the pattern for auto convergence.

Here, the optical sensor and the pattern position detector detect the first and second optical sensors having a predetermined distance from the auto-convergence pattern, a buffer for buffering the output of the first optical sensor, and the output of the second optical sensor. It is preferable to include an inverter for butting.

The sensor pattern position calculating unit may include first and second amplifier circuits for amplifying output values of the first and second optical sensors, and a first addition circuit for adding output values of the first and second amplifier circuits. And a second addition circuit for adding an output value of the first addition circuit to a bias voltage, an analog / digital converter for digitally converting the output value of the second addition circuit, and the first value at an output value of the analog / digital converter. It is preferable that the sensor is configured to include a sensor distance calculator for calculating the distance between the second optical sensor.

The black screen may be processed by the control unit by using the positions of the plurality of optical sensors for auto-convergence around the display unit according to the calculated distance between the first and second optical sensors.

In order to achieve the above object, the present invention provides a method for performing auto-convergence in a video device, comprising: muting the displayed video when a control signal for performing auto-convergence is input during video viewing after the video device is turned on; Black screening an outer region of a display region of the imaging device including an auto-convergence pattern for performing convergence and an overscan region in which an optical sensor is located, and displaying the image on a display region other than the current outer region It provides a method for auto-convergence in a video device comprising the step of performing the auto-convergence in the state.

In the case where the image is displayed in the display unit region other than the black screen, it is preferable to display the picture in a picture in picture format.

In addition, it is preferable to display the auto-convergence performance state on the display area during the auto-convergence.

Therefore, according to the present invention, there is an effect of viewing an image even while performing auto convergence.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

5 is a block diagram illustrating a video device according to the present invention.

The imaging apparatus according to the present invention includes a tuner unit 210, an intermediate frequency processor 220, an audio output unit 230, an image processor 240, a deflection circuit unit 250, a projector unit 260, and a display unit 270. ), An optical sensor and a pattern position detector 271, a convergence circuit 280, a controller 290, and a sensor pattern position calculator 300.

The tuner 210 tunes a broadcast signal.

The intermediate frequency processor 220 separates the video signal and the audio signal, outputs the audio signal to the audio output unit 230, and outputs the video signal to the image processor 240.

The voice output unit 230 outputs a voice signal from the intermediate frequency processor 220.

The image processor 240 scales the image signal from the intermediate frequency processor 220. In this case, the main frame and the picture-in-picture (PIP) frame processing are performed, and a predetermined area of the display unit 270 is black screened.

The deflection circuit unit 250 performs a deflection process for the projector unit 260.

The projector 260 projects the R, G, and B images onto the display 270.

The display unit 70 displays an image.

The convergence circuit unit 280 generates R, G, and B signal patterns for auto convergence according to the control signal of the controller 290, and performs auto convergence according to the pattern detected by the optical sensor.
At this time, the optical sensor and the pattern position detection unit 271 is composed of a buffer for buffering the maximum output of the first sensor, and an inverter for inverting the maximum output of the second sensor.

The control unit 290 controls the image device, and according to the position of the light sensor in the display unit 270 calculated by the sensor pattern position calculation unit 300 through the image processing unit 240 to the outer portion of the display unit 270 The auto-convergence is performed by black screen processing, and the image may be displayed in the display unit 270 area other than the black screen even during auto-convergence. In this case, only an area other than the black screen is displayed or the entire image is displayed on a slightly smaller screen through a picture-in-picture (PIP).

The sensor pattern position calculator 300 detects the pattern signal and the optical sensor position of the R, G, and B signals for auto convergence. At this time, the sensor pattern position calculation unit 300 is a sensor for calculating the distance between the first and second amplification circuit, the peripheral circuit composed of the first, second addition circuit and analog-digital converter, and the first and second sensors. It is composed of a distance calculator.
At this time, the above components are supposed to have the same delay.

The imaging device of the present invention having such a configuration automatically performs R, G, B color matching operation using an optical sensor in, for example, a projection TV, and due to the interference of image light, R In order to prevent the operation error of the optical sensor caused by the G and B light, the display part is blanked and the screen cannot be viewed by displaying the image signal in the entire display part. The sub-area is black-screened, and other areas can display broadcast programs.

6 is a view illustrating in detail the light sensor and the pattern position detection unit shown in FIG. 5, and FIGS. 7 and 8 are views for explaining a position calculation method between an auto-convergence pattern and the light sensor, and FIGS. 9 and 10 7 and 8 are diagrams for explaining the voltage output to the light of the optical sensor in FIG.

First, in the present invention, the position of the pattern for auto convergence and the optical sensor is calculated.

First, we need to get distance information about one auto-convergence pattern (hereinafter referred to as 'reference pattern') by using two optical sensors in a narrow space called overscan where at least two optical sensors are located. In order to reduce interference with each other, there is a need to reduce the size of the reference pattern.

First, only the optical sensor position calculation in the horizontal direction is considered, and the optical sensor position calculation method in the vertical direction is the same as in the horizontal direction.

Here, the arrow indicates the direction of movement of the basic pattern used to calculate the basic pattern position for automatic color matching.

At this time, in order to minimize the interference between the optical sensors, the thickness of the basic pattern is smaller than in the prior art, and the interval of the optical sensors is widened.

And the voltage output to the light of the optical sensor in Figs. 7 and 8 are the same as Figs. 9 and 10, respectively. In this case, it is assumed that the optical sensor does not have an AC voltage component and outputs only a DC voltage.

Fig. 9 shows only the DC voltage output of the photosensor according to the basic pattern shift, the maximum value being Vs.

10 is a DC voltage output while sequentially moving the first and second optical sensors, and the maximum output of each optical sensor is Va and Vb.

The output waveforms of the optical sensor and the pattern position detection unit for calculating the optical sensor position in the imaging device shown in FIG. 5, the buffer pattern and the inverter among the sensor pattern position calculation unit and the peripheral circuits are set to the maximum voltage of the first and second sensors. In this case, it means a result waveform after passing through the buffer of the optical sensor and the pattern position detection unit 271 and the inverter.

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FIG. 13 is a diagram for explaining an output waveform after passing through the buffer and the inverter after passing through the optical sensor, the pattern position detector, and the amplification circuit and the addition circuit among the peripheral circuits of the sensor pattern position calculator.

The amplifying circuit is a double first and second amplifying circuit as an example, and comes out through the first and second adding circuits. Assuming that Vbias = 2Vs, the maximum voltage is 4Vs.

FIG. 14 is a diagram for explaining an output waveform after the output waveform shown in FIG. 13 passes through an A / D converter among peripheral circuits.

In order to calculate the exact center position between the two first and second sensors, as shown in FIG. 14, the maximum and minimum values are n and n + m points, and when m = even, the center position = n + m * 0.5 points If m = odd, the absolute value of the center position = n + (m + 1) * 0.5 and n + (m-1) * 0.5 is converted to an absolute value. The small point is the center position.

At this time, the counter is calculated using the counter of the peripheral circuit.

Through the above process, the center position between the first and second sensors is memorized after the factory production adjustment.

The R, G, and B patterns are sequentially moved horizontally and vertically to store positions up to the first to eighth optical sensors (see 30a to 30h in FIG. 3) for autoconvergence.

15 is a diagram for describing auto convergence adjustment using a reference pattern.

Since the center position between the first and second sensors is stored as shown in FIG. 14, the convergence adjustment is performed by moving vertically and horizontally through the above process again using the reference pattern.

In this case, cZ in FIG. 15 is a mis-convergence vector, and compensates for misconvergence by moving the distorted R, G, and B patterns horizontally i times and vertically j times.

16 to 17 illustrate an auto-convergence pattern when performing auto-convergence according to the present invention.

When performing the sensoring on the Auburn scan while watching the actual screen, if the reference pattern is made by using the control unit or the convergence circuit unit as in the conventional technique, the same color patterns are moved while moving the R, G, and B patterns. Will flow.

Therefore, in order to prevent the flow of the R, G, and B patterns, the reference pattern is performed using the function of the PIP of the main image processing.

That is, as shown in FIG. 17, the reference pattern is formed into a pattern using the PIP frame FRAME, and the overscan portion is blacked (BLACK (MUTE)) in the main frame MAIN FRAME.

The black processed part uses the CCD camera based on the SMPTE test pattern to adjust the overall production size, so the actual screen size is memorized by the sensor.

18 is a diagram for describing a black processing method of an overscan portion in a display unit (screen).

In the method of processing the black (image mute) of the overscan area, as illustrated in FIG. 17, the size of the effective screen is determined by using the camera and the sensor ring, and the distance to the sensor is calculated. Process with black screen area.

The second method is the same as the general screen processing by the image processor (or SRC IC, SCALER IC).

In other words, when using the functions such as PIP, POP, DOUBLE WINDOW, etc. of the video device (TV), the position is determined when the factory adjustment is made despite the change of the mechanism and optics. will be.

As shown in FIG. 18, the reason why the black screen processing is applied to the edge of the actual video screen area is that the projection TV is affected by the geomagnetic field, which causes slight screen movement in the vertical and horizontal directions. It is only visible during the match and not visible when viewed.

In addition, when the sensor is over-scanned using the PIP frame, the actual video screen area is fixed so that the viewer does not seem to shake the entire screen.

Of course, when the distance data measurement is completed after sensing, misconvergence correction may cause the whole screen to shake.

19 is a flowchart for explaining an auto-convergence method in a video device according to the present invention.

The auto-convergence method in the imaging apparatus according to the present invention determines whether a control signal (for example, through a remote controller) for performing auto-convergence is input from the user after the TV is powered on (S100).

As a result of the determination (S100), when the control signal is not input, a guide message requesting to input a control command for performing auto convergence again is displayed on the display area (S110).

However, when the determination result (S100) control signal is properly input, the image being displayed is muted (S120).

Subsequently, the external light of the projection TV is checked to determine whether the external light is not suitable for performing auto convergence (S130). This is to prevent an error of the optical sensor when performing auto convergence.

As a result of determination (S130), if it is too bright to perform auto convergence, a guide message requesting input of a control signal for darkening and re-adjusting the ambient light is displayed (S140).

However, if the external light is not particularly bright (S130), the overscan screen is black screened (S150).

Subsequently, color matching for each of R, G, and B is executed (S160), and automatic color matching can be guided at this time (for example, automatic color matching XX%) (S170).

Then, auto-convergence for color matching is performed as compared with the adjustment state at the time of factory shipment (S180).

Subsequently, the PIP screen is restored to the initial screen (S190).

According to the present invention, the image display method in the projection TV has an effect of viewing the current image through a predetermined area of the display area while performing auto convergence.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (12)

In video equipment, A display unit which displays an image and has an optical sensor and a light sensor and a pattern position calculator for calculating a position between the auto-convergence pattern and the optical sensor and the auto-convergence pattern; A convergence circuit unit generating a signal pattern for auto convergence in the display unit and performing auto convergence according to the pattern detected by the optical sensor; A sensor pattern position calculator for detecting a pattern signal for auto-convergence in the imaging device and sensor positions from the optical sensor and the pattern position calculator; And a control unit for black screening a predetermined portion of the display unit during auto convergence according to the position of the optical sensor in the display unit calculated by the sensor pattern position calculation unit, and controlling to display an image in a display unit area other than the black screen. Imaging device, characterized in that. The method of claim 1, The video device includes a tuner for tuning a broadcast signal; An image processor which performs scaling processing on the broadcast signal; And a projector for projecting the image onto a display unit. The method of claim 2, And the image processing unit performs the black screen processing according to the control signal of the controller. The method of claim 1, And the controller controls to display in a picture-in-picture format when displaying an image in a display unit region other than the black screen. The method of claim 1, And the optical sensor and the pattern position calculator are formed in an area between the outermost part of the display unit and the black screen. The method of claim 1, And at least two optical sensors in order to obtain distance information on the auto-convergence pattern. The method of claim 1, The optical sensor and the pattern position detection unit having first and second optical sensors having a predetermined distance from the autoconvergence pattern; A buffer buffering an output of the first optical sensor; And an inverter for inverting the output of the second optical sensor. The method of claim 7, wherein The sensor pattern position calculation unit, First and second amplifier circuits for amplifying the output values of the first and second optical sensors, respectively; A first addition circuit for adding output values of the first and second amplifier circuits; A second addition circuit for adding an output value of the first addition circuit with a bias voltage; An analog / digital converter for digitally converting the output value of the second addition circuit; And a sensor distance calculator configured to calculate a distance between the first and second optical sensors from an output value of the analog / digital converter. The method of claim 7, wherein And the black screen is processed by the controller using the positions of the plurality of optical sensors for auto-convergence around the display unit according to the calculated distances between the first and second optical sensors. In performing auto-convergence on video equipment, Muting the displayed image when a control signal for performing auto convergence is input while viewing the image after turning on the image apparatus; Black screening an outer region of the display region of the imaging device, including an auto-convergence pattern for performing the auto convergence and an overscan region in which an optical sensor is located; And performing the auto convergence while the image is displayed on a display area except the current outer area. The method of claim 10, And displaying the picture in a picture in picture format when the image is displayed in a display area other than the black screen. The method of claim 10, And displaying the auto-convergence status on the display area during the auto-convergence.

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