KR100250189B1 - Automatic pin-cushion adjusting apparatus - Google Patents

Abstract

PURPOSE: An apparatus and a method of automatically controlling pin cushion of a screen are to pick-up an image of a pin cushion detecting pattern and automatically perform a pin cushion compensating operation based on a reference cushion pattern according to a result of the picked-up image. CONSTITUTION: A pin cushion compensating portion(44) applies a compensating current for adjusting a pin cushion with respect to a CRT(10) for reproducing an image. A pattern generating portion(42) is actively controlled in a pin cushion controlling mode to display a pin cushion detecting pattern on the CRT. The pin cushion detecting pattern is formed into an introrse and extrorse curved black stripe type. The first to third image portion(22,24,26) picks-up the pin cushion detecting pattern displayed on the CRT. The first to third pattern detecting portion(28,30,32) is correspondingly coupled to the first to third imaging portion to transform an image of the pin cushion detecting pattern into a white level. A comparing portion(34) compares the white level of the pin cushion detecting pattern with reference pin cushion pattern data to generate a pin cushion controlling signal.

Description

Pincushion automatic adjustment device of video screen and its method {AUTOMATIC PIN-CUSHION ADJUSTING APPARATUS}

The present invention relates to a device for automatically adjusting pincushion of a video screen and a method thereof, and more particularly, to capture a plurality of inward curved and outward curved pincushion detection patterns displayed on a television CRT video screen, and to detect white by the imaging result. The present invention relates to a pincushion automatic adjustment device for a video screen and a method for automatically adjusting a pincushion by comparing a level with reference pattern data.

In general, a CRT apparatus as a representative video output means employed in a television for reproducing a video signal based on a broadcast signal or an external video signal has an R / G / B color corresponding to the R / G / B color level of the video signal. Accelerating and focusing the R / G / B electron guns arranged in an in-line or delta (Δ) form to radiate the beams, and the R / G / B color beams emitted from the R / G / B electron guns When a plurality of grid electrodes and R / G / B color beams accelerated and focused at the plurality of grid electrodes are aimed and supported by the shadow mask, the R / G / B color pixels emit light to reproduce a color image screen. It consists of a fluorescent panel in which R / G / B color pixels are formed. Also, a horizontal deflection coil and a horizontal deflection coil are arranged on the outside of the CRT device so that the image screen is formed on the entire screen of the CRT device by deflecting the R / G / B color beams reaching the fluorescent panel in the vertical direction and the horizontal direction. Deflection coil is installed.

Therefore, according to such a CRT apparatus, the R / G / B color beam emitted from the R / G / B electron gun corresponding to the R / G / B color level of the image signal is vertically and horizontally formed by the vertical deflection coil and the horizontal deflection coil. In the state of deflection in the direction, the corresponding R / G / B color pixel formed on the fluorescent panel with the support of the shadow mask is reached, so that the R / G / B color pixel on the fluorescent panel emits light to reproduce the color image. .

In general, the vertical and horizontal driving signals are oscillated and applied to the vertical deflection coil and the horizontal deflection coil of the R / G / B color beam based on the vertical and horizontal synchronization signals separated from the video signal. The current of the vertical and horizontal driving signals flows in the vertical deflection coil and the horizontal deflection coil so that the R / G / B color beam in the CRT apparatus is deflected in the vertical direction and the horizontal deflection in correspondence with the current level and reaches the fluorescent panel. Will be.

However, the CRT apparatus is generally set to have different dimensions in the horizontal and vertical directions due to its structure. Accordingly, the fluorescent panel of the CRT apparatus is longer from the center toward the periphery. Therefore, even if the R / G / B color beams are deflected by the vertical and horizontal deflection currents flowing through the vertical deflection coil and the horizontal deflection coil, the four-edge portion of the fluorescent panel of the CRT apparatus has the maximum deflection shake. The so-called 'pincushion' phenomenon in which the raster shape of the direction is distorted in the form shown in FIGS. 1 (a) and 1 (b) is caused.

That is, according to the horizontal pincushion phenomenon shown in Fig. 1 (a), the curvature is curved inward in the center of the screen of the CRT apparatus due to the lack of amplitude due to the horizontal deflection current flowing in the horizontal deflection coil. The pincushion phenomenon in the direction is corrected by superimposing an outwardly curved current level with respect to the inwardly curved horizontal raster and applying it to the horizontal deflection coil. Further, according to the pincushion phenomenon in the vertical direction shown in FIG. 1 (b), for example, the inverted curved portion in the center of the screen of the CRT apparatus due to the lack of amplitude due to the vertical deflection current flowing in the vertical deflection coil, The direction of pincushion is corrected by superimposing the outwardly curved current level with respect to the inwardly curved vertical raster and applying it to the vertical deflection coil.

Such pincushion in the horizontal direction and pincushion in the vertical direction are caused by the lack of horizontal amplitude and vertical amplitude in the center of the video screen.In order to correct the pincushion, a pincushion correction circuit is installed on the horizontal / vertical deflector for the horizontal correction. The currents flowing through the deflection coil and the vertical deflection coil are superimposed on the correction current of the insufficient amplitude portion.

Therefore, in the assembling stage of the television, the correction current flowing through the horizontal deflection coil and the vertical deflection coil by the pincushion correction circuit is properly adjusted and shipped. However, the adjustment of the pincushion correction current is usually performed by the operator. It is executed while directly observing the state of the video screen. For this reason, not only the manual support of the operator for the adjustment of the pincushion is necessary in the assembly process of the television, but also a relatively long time is used and disadvantageous in the process for the adjustment of the pincushion. Therefore, the necessity of manpower consumed in the adjustment work of the pincushion for such a video screen or the need for automation for the pincushion adjustment for a short time is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and introduces an automation concept for pincushion correction work performed at the assembling stage of a television to image pincushion detection patterns of a plurality of inward curved and outward curved shapes displayed on a CRT apparatus. It is an object of the present invention to provide an automatic pincushion adjusting apparatus for a video screen and a method for automatically correcting the image pickup result based on a reference pincushion pattern.

In order to achieve the above object, according to a preferred aspect of the present invention, in a pincushion adjustment mode, a television with a pincushion correction unit for superimposing a correction current for adjusting a pincushion to a CRT apparatus for reproducing an image screen is superimposed. A pattern generating unit which is activated and controlled to display the pincushion detection patterns generated in a plurality of inwardly curved and outwardly curved black stripes on the CRT device, and the pincushion detection pattern displayed on the CRT device. A first to third image pickup unit configured to be coupled to the first to third image pickup units to convert the image of the pincushion detection pattern into a white level; -Comparing the white level of the pincushion detection pattern detected by the third pattern detection unit with the reference pincushion pattern data stored in the reference pattern memory; And a pincushion adjustment signal for generating a pincushion adjustment signal, and controlling the activation of the pincushion detection pattern portion in the pincushion adjustment mode, and based on the pincushion adjustment signal from the comparator. There is provided a pincushion automatic adjustment apparatus for a video screen, comprising a control unit 40 for executing pincushion adjustment by setting the pincushion adjustment amount by the average calculation of the pincushion adjustment amount.

Further, according to another preferred aspect of the present invention, in a television having a pincushion correction unit for superimposing a correction current for adjusting a pincushion to a CRT device for reproducing an image screen, the CRT device in the pincushion adjustment mode. Image-displaying the pincushion detection pattern of the inwardly curved black stripe shape and the outwardly curved black stripe shape on the screen under the control of the control unit, and imaging by the first to third imaging units; Generating a pincushion adjustment signal of the inward curved pincushion adjustment data and the outward curved pincushion adjustment data by comparing the pincushion detection pattern picked up by the unit with the reference pincushion detection pattern stored in the reference pattern memory; In response, the control unit averages the inward curved pincushion adjustment data and the outward curved pincushion adjustment data. And calculating the average value as the pincushion adjustment value, and setting the pincushion correction unit.

As described above, according to the pincushion automatic adjustment device of the video screen and the method according to the present invention, the pincushion detection pattern is displayed on the CRT device and the white level according to the detection of the pattern is compared with the reference pincushion pattern data in the comparator. The pincushion adjustment signal is obtained, and the control unit sets the pincushion adjustment amount for the pincushion adjustment unit in response to the pincushion adjustment signal to automatically execute the pincushion adjustment for the CRT device.

1 (a) is a diagram illustrating a horizontal pincushion state on a CRT video screen of a general television;

Fig. 1 (b) is a diagram illustrating a vertical pincushion state on a CRT video screen of a general television.

2 is a block diagram showing an automatic pincushion adjustment device for a video screen according to a preferred embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating an image capturing operation of the first to third pincushion detecting patterns shown in FIG. 2 on the CRT image screen and the first to third image capturing units for capturing the pincushion detecting pattern; FIG.

4 is a flowchart illustrating a pincushion automatic adjustment method by an automatic pincushion adjustment apparatus for an image screen according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: CRT apparatus, 22, 24, 26: imaging unit,

28, 30, 32: pattern detection unit, 34: comparison unit,

36: reference pattern memory, 40: control unit,

42: pattern generator, 44: pincushion correction.

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

FIG. 2 is a block diagram of a device for automatically adjusting a pincushion of a video screen according to a preferred embodiment of the present invention. The first to third imaging units 22 in a vertical direction on one side of the video screen of the CRT apparatus 10 are shown in FIG. And 24 and 26, the first to third imaging units 22, 24 and 26 have a well-known color analyzer (Charge Coupled Device), for example, and a pincushion. In the adjustment mode, a plurality of pincushion detection patterns (20a, 20b, 20c, 20d, 20e, and 20f in FIG. 3) displayed on the CRT apparatus 10 are taken.

Also, for the first to third imaging units 22, 24, and 26, the imaging results of the pincushion detection patterns 20a, 20b, 20c, 20d, 20e, and 20f displayed on the CRT apparatus 10 are white. First to third pattern detectors 28, 30, and 32 are provided correspondingly as the level signals for transform detection, where the first and third pattern detectors 28, 30, and 32 are displayed on the CRT image screen. This is to correct the pincushion with reference to the provided white level so that the transmission level of the carrier wave is not interrupted based on the white color (WHITE) according to the analysis operation of the color analyzer.

In FIG. 2, the comparison unit 34 denotes reference pattern data stored in the reference pattern memory 36, that is, the white level signal provided from the first to third pattern detection units 28, 30, and 32, that is, the CRT apparatus 10. The comparison result is compared with the linear data in the vertical and horizontal directions according to a predetermined current level, in which the fluctuation of the deflection is set to a minimum with respect to the R / G / B color beam located at the edge of the signal. Will be output as the pincushion adjustment signal. In addition, the control unit 40 provided at the rear end of the comparison unit 34 activates the pattern generating unit 42 under the setting of the pincushion adjustment mode MODE so that the pincushion detection patterns (20a, 20b and 20c in FIG. The pincushion detection patterns 20a, 20b, 20c, 20d, and 20e are controlled to be displayed on the screen of the CRT apparatus 10 through the image processing system of the corresponding television. In response to the imaging result of (20f), the pincushion adjustment amount is determined based on the pincushion adjustment signal applied from the comparator 34 to execute the control to execute the pincushion adjustment operation.

In FIG. 2, reference numeral 44 denotes a pincushion correction unit for superimposing a pincushion correction current to a horizontal deflection coil (or a vertical deflection coil) according to the pincushion adjustment amount applied from the control unit 40.

Next, the pincushion automatic adjustment method by the pincushion automatic adjustment device of the video screen having the above-described configuration will be described in detail with reference to the flowchart shown in FIG.

First, in the assembling step of the corresponding television, the first to third imaging units 22, 24, and 26 are arranged in a vertical direction on one side of the video screen of the CRT apparatus 10 in the form illustrated in FIG. The reference pattern memory 36 stores a plurality of linear reference pattern data 20a, 20b, and 20c that are linear in the vertical direction of FIG. 3 which is applied when adjusting the pincushion in the horizontal direction.

In this state, if a signal for setting the pincushion adjustment mode (MODE) is applied to the control unit 40, the control unit 40 sets the pincushion adjustment mode for the corresponding television in step 60 and then the pattern in step 62. The generator 42 is activated, and the pattern generator 42 has a predetermined width linearly in the vertical direction and has a predetermined color (preferably 3 in the present invention) having a predetermined color (preferably black stripe). The curved pincushion detection patterns 20d, 20e, and 20f are generated and applied to be displayed on the screen of the CRT apparatus 10 through an image processing system.

Then, the pincushion detection patterns 20d, 20e, and 20f are displayed on the CRT device 10 in the state of pincushion adjustment by the pincushion correction current set by the pincushion correction unit 44 at first. When the pincushion correction current set by the pincushion correction unit 44 is appropriate, the plurality of pincushion detection patterns 20d, 20e, and 20f displayed on the CRT apparatus 10 generally maintain a linear shape in the vertical direction. If the pincushion correction by the pincushion correction unit 44 is not appropriate, the pincushion detection patterns 20d, 20e, and 20f are curved inwardly (or in the form shown in Fig. 1 (a), for example). The reverse shape).

Accordingly, in step 64, the first to third imaging units 22, 24, and 26 capture the pincushion detection patterns 20d, 20e, and 20f that are displayed at corresponding positions of the CRT apparatus 10. The first and third pattern detection units 28, 30 and 32 are applied to the first and third pattern detection units 28, 30 and 32. Accordingly, the first and third pattern detection units 28, 30 and 32 are applied to the first and third imaging units 22 and 24. A white level is detected by the pincushion detection patterns 20d, 20e, and 20f and is applied to the comparator 34.

Therefore, in the comparison unit 34, the first to third imaging units 22, 24, and 26 are formed around the pincushion detection patterns 20d, 20e, and 20f captured by the second imaging unit 24. The white levels of the pincushion detection patterns 20d, 20e, and 20f captured are sequentially compared with the linear reference pincushion pattern data 20a, 20b, and 20c in the vertical direction stored in the reference pattern memory 36. That is, according to the comparison process of the comparison unit 34, when the pincushion detection patterns 20d, 20e, and 20f are linearly displayed on the CRT device 10 in the reference pattern memory 36, 1-The white levels of the pincushion detection patterns 20d, 20e, and 20f captured by the third image pickup units 22, 24, and 26 are the reference pincushion pattern data 20a, 20b, and 20c stored in the reference pattern memory 36. If the pincushion adjustment to the CRT apparatus 10 is not accurate, the pincushion detection patterns 20d and 20e captured by the first to third imaging units 22, 24 and 26 are completely matched. 20f) and reference pin cushion data 20a, 20b, and 20c stored in the reference pattern memory 36 do not coincide. In the comparison unit 34, differences between the reference pin cushion data and the pincushion detection pattern are measured. The difference is detected and the detected data is output to the controller 40 as a pincushion adjustment signal.

Accordingly, the control unit 40 sets and applies the pincushion adjustment amount in an incremental form to the pincushion correction unit 44 based on the pincushion adjustment signal applied by the comparison unit 34 in step 66. Accordingly, in the pincushion correction unit 44, the pincushion detection patterns 20d, 20e, and 20f on the CRT apparatus 10 captured by the first to third imaging units 22, 24, and 26 are bent inwardly. The pincushion correction amount by setting a pincushion adjustment amount such that the pincushion correction current is gradually increased to be corrected in a linear form in the vertical direction in the same manner as the reference pincushion patterns 20a, 20b, and 20c stored in the reference pattern memory 36 Is applied to (44).

The CRT apparatus 10 which is imaged by the first to third imaging units 22, 24 and 26 by such pincushion adjustment and compared with reference pin cushion data 20a, 20b and 20c in the comparison section 34. If the upper pincushion detection patterns 20d, 20e, and 20f are detected in a normal state, that is, if the pincushion adjustment is detected in a good state in step 68, the control unit 40 stores the pincushion adjustment amount in the internal memory in step 70. Stored in the means.

Subsequently, the control unit 40 controls to generate an outwardly curved pincushion detection pattern with respect to the pattern generator 42 in step 72, and detects the outwardly curved pincushion shape generated by the pattern generator 42. The pattern is processed in the image processing system and displayed on the CRT apparatus 10, and the outwardly curved pincushion detection pattern displayed on the CRT apparatus 10 is obtained in step 74. 24, 26, which are converted to the white level by the corresponding first-third pattern detectors 28, 30, 32, and then applied to the comparator 34.

Accordingly, the comparison unit 34 compares the white levels from the first to third pattern detection units 28, 30, and 32 with the reference pin cushion data 20a, 20b, and 20c stored in the reference pattern memory 36. The comparison result is applied to the controller 40 as a pincushion adjustment signal. Therefore, the control unit 40 sets and applies the pincushion adjustment amount in the form of gradually decreasing to the pincushion correction unit 44 based on the pincushion adjustment signal applied from the comparison unit 34 in step 76. Accordingly, in the pincushion correction unit 44, the pincushion detection patterns 20d, 20e, and 20f on the CRT apparatus 10 captured by the first to third imaging units 22, 24, and 26 are curved outward. The pincushion correction by setting a pincushion adjustment amount such that the pincushion correction current is gradually reduced to be corrected in a linear form in the vertical direction in the same manner as the reference pincushion patterns 20a, 20b, and 20c stored in the reference pattern memory 36. Is applied to (44).

The CRT apparatus 10 which is imaged by the first to third imaging units 22, 24 and 26 by such pincushion adjustment and compared with reference pin cushion data 20a, 20b and 20c in the comparison section 34. When the pincushion detection patterns 20d, 20e, and 20f of the image are detected to be in a normal state, that is, when the pincushion adjustment is detected in a good state in step 78, the controller 40 deflects the pincushion adjustment amount outward in step 80. It is stored in the internal memory means as pincushion correction data in the form.

Subsequently, the control unit 40 averages the inward curvature-shaped pincushion correction data and the outward curvature-shaped pincushion correction data stored in the internal memory means in 1/2 to obtain the corresponding pincushion adjustment data of the television. The pin cushion compensator 44 is set.

Meanwhile, although the present invention has been described taking the adjustment of the horizontal pincushion of the CRT apparatus as an example, the present invention is not limited to the application example of the adjustment of the horizontal pincushion, but from the pattern generator 42 in the horizontal direction. The pincushion detection pattern displayed linearly is displayed on the CRT apparatus 10, so that the same applies to the pincushion adjustment in the vertical direction.

In addition, the present invention is not limited to the above example, but within the range of correcting the pincushion of the CRT device 10 by applying a method of displaying a specific pincushion detection pattern on the CRT device 10 and imaging the displayed pincushion detection pattern. Of course, various changes and modifications are possible.

As described above, according to the apparatus for automatically adjusting the pincushion of the video screen and the method thereof, the pincushion of the CRT apparatus can be automatically adjusted based on the reference pincushion pattern data during the assembling of the television. The pincushion adjustment work of the company can be improved, as well as productivity.

Claims (2)

In a television equipped with a pincushion correction unit 44 for superimposing a correction current for adjusting a pincushion to a CRT device 10 for reproducing an image screen, The pattern generator 42 activates and controls the pincushion detection pattern generated in a plurality of inwardly curved and outwardly curved black stripes of the CRT device 10 in the pincushion adjustment mode. )Wow, First to third imaging units 22, 24, and 26 for imaging the pincushion detection pattern displayed on the CRT apparatus 10; First and third pattern detection units 28, 30, and 32 correspondingly coupled to the first and third imaging units 22, 24, and 26 for converting the imaging result of the pincushion detection pattern to a white level; , A comparison unit generating a pincushion adjustment signal by comparing the white level of the pincushion detection pattern detected by the first to third pattern detection units 28, 30, and 32 with reference pincushion pattern data stored in the reference pattern memory 36; With 34, In addition to controlling the activation of the pincushion detection pattern section 42 in the pincushion adjustment mode, the amount of pincushion adjustment in the form of inward curvature and the amount of the pincushion form of outward curvature based on the pincushion adjustment signal from the comparator 34. And a control unit 40 for executing pincushion adjustment by setting the amount of pincushion adjustment by the average calculation of the image. In a television equipped with a pincushion correction unit 44 for superimposing a correction current for adjusting a pincushion to a CRT device 10 for reproducing an image screen, In the pincushion adjustment mode, on the CRT apparatus 10 under the control of the controller 40, the inward curved black stripe type and the outward curved black stripe type pincushion detection pattern are displayed on the screen, and the first to third imaging units are displayed. Imaging by (22, 24, 26), The inward curvature pincushion adjustment data is compared by comparing the pincushion detection pattern picked up by the first to third imaging units 22, 24, and 26 with the reference pincushion detection pattern stored in the reference pattern memory 36 by the comparator 34. Generating a pincushion adjustment signal of outward curved pincushion adjustment data; In response to the pincushion adjustment signal, the controller 40 calculates an average value of the inwardly curved pincushion adjustment data and the outwardly curved pincushion adjustment data, and sets the calculated average value as the pincushion adjustment value to the pincushion correction unit 44. Pincushion automatic adjustment method of the video screen, characterized in that consisting of.

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