KR100325758B1 - A method and apparatus for testing a purity in a in-line type CRT - Google Patents

Abstract

The present invention relates to a purity test apparatus and method for an inline cathode ray tube,

Inputting a request for testing whether the winding direction of the purity coil is correct; Generating a first control signal having a minimum value and a second purity control signal having a maximum value and simultaneously generating a third control signal having a high or low level; The G electron gun firing a G electron beam by the third control signal; A first purity correction current having a maximum value in a negative (-) direction by the first purity control signal, and a second purity correction current having a maximum value in a positive (+) direction by the second purity control signal. Generating a; Supplying the first purity correction current to a left purity coil to move the G electron beam to the right as much as possible, and supplying the second purity correction current to the right purity coil to move the G electron beam to the left as much as possible; Light emitting only the R phosphor on the left side of the screen by the G electron beam moved to the right as much as possible, and only the B phosphor on the right side of the screen by the G electron beam moved to the left as much as possible.

By automatically testing the correct direction of winding of the purity coil in the production process of the inline cathode ray tube, the operator can visually easily identify the defective product.

Description

A method and apparatus for testing a purity in a in-line type CRT}

The present invention relates to a purity test apparatus and method for an inline cathode ray tube.

More particularly, the present invention relates to an in-line cathode ray tube purity test apparatus and method for automatically testing whether the direction of winding of the purity coil is correct in the production process of the in-line cathode ray tube.

In general, the cathode ray tube (CRT) used in image display equipment uses the principle that different amounts of electron beams strike RGB phosphors coated on the surface of the cathode ray tube to emit light of different brightness or colors according to the intensity of the image signal. It is widely used because of its excellent price and display performance.

FIG. 1 is a view illustrating a typical cathode ray tube. As shown in FIG. 1, the cathode ray tube CRT includes a heater H, a cathode K, a plate P, a control grid G1, and a screen grid G2. ), The focus grid G3, and the anode electrode G4. When a current flows in the heater H, heat is generated in the heater H to heat the cathode K, and apply the cathode K to the cathode K. FIG. Large and small electron beams are generated according to the intensity of the video signal.

The electron beam of the negative potential (-) is led to the plate (P) by the very high potential (+) voltage applied to the plate (P), the electron beam passes through the plate (P) to the cathode ray tube (CRT) When it hits the phosphor coated on the surface, the energy of the electron beam is emitted to light.

2A is a view for explaining a delta type cathode ray tube, and FIG. 2B is a view for explaining an inline type cathode ray tube.

The cathode ray tube is largely divided into a delta type and an in-line type. The delta type cathode ray tube refers to an RGB electron gun and an RGB phosphor arranged in Δ, as shown in FIG. 2A. The inline cathode ray tube refers to an arrangement of RGB electron guns and RGB phosphors in a straight line as shown in FIG. 2B.

Since the RGB diameter of the delta electron gun is larger than the RGB diameter of the inline electron gun, the aperture diameter of the delta electron gun is larger and the aberration is reduced, so the focus characteristic is good, but inline electron gun is advantageous in terms of power consumption. Monitors use a lot of inline electron guns.

Generally, as shown in FIG. 1, a Purity Coil L is wound around each corner of a cathode ray tube, and Purity means color of the electron beam emitted from each of the RGB electron guns to reach the respective phosphors. If the purity characteristic is bad, monochromatic light emission is impossible.

That is, the electron beam emitted from the G electron gun touches not only the G phosphor but also the R phosphor and the B phosphor, resulting in poor purity.

As described above, the purity coil L is wound around four corners of the cathode ray tube in a predetermined direction. At this time, if the winding direction of the purity coil is not correct, the purity adjustment is distorted, resulting in poor color purity of the image. There was a problem.

In addition, in order to test whether the winding direction of the purity coil is correct, the operator must manually observe the purity parameter by manually using the OSD, and there is a problem in that productivity is reduced.

Accordingly, the present invention has been made to solve the above problems, to provide a purity test apparatus and method of the in-line cathode ray tube for automatically testing whether the winding direction of the purity coil in the production process of the in-line cathode ray tube is correct. Its purpose is to.

Apparatus according to the present invention for achieving the above object,

In an inline cathode ray tube in which RGB phosphors are arranged in a straight line, when a purity test request is input from an operator in a production process to test whether the winding direction of the purity coil is correct, the first purity control signal having the minimum value and the maximum value are set. Control means for outputting a second purity control signal having a high and low level third control signal; A video amplifier for supplying a test G video signal to a G electron gun by the third control signal; A first and second OP amplifiers connected to the first and second output terminals of the control means to voltage amplify the first and second control signals output from the control means, and output voltage amplified through the first and second OP amplifiers And a first and second push-pull amplifiers for amplifying and outputting current, outputting a first purity correction current having a maximum value in the negative direction by the first purity control signal, and bidirectionally by the second purity control signal. Correction current supplying means for outputting a second purity correction current having a maximum value; Winding around the corner portion of the cathode ray tube, respectively, by moving the G electron beam emitted from the G electron gun to the right by the first purity correction current supplied to one of the left or right side to emit only the right phosphor relative to the G phosphor. And a purity coil configured to move the G emission beam emitted from the G electron gun to the left as much as possible by the second purity correction current supplied to the other side to emit only the left phosphor based on the G phosphor.

In addition, the method according to the present invention for achieving the above object, in an inline type cathode ray tube in which the Purity coil is wound around the edge portion and the RGB phosphors are arranged in a straight line, it is tested whether the winding direction of the Purity coil is correct Inputting a test request from an operator in the production process for the purpose of; Generating a first control signal having a minimum value and a second purity control signal having a maximum value and simultaneously generating a third control signal having a high or low level; Firing a G electron beam by a G electron gun by the third control signal; Generating a first purity correction current having a maximum value in a negative direction by the first purity control signal, and generating a second purity correction current having a maximum value in both directions by the second purity control signal; Supplying the first purity correction current to one side of a left purity coil or a right purity coil to move the G electron beam to the right as much as possible, and supplying the second purity correction current to the other side to move the G electron beam to the left as much as possible. ; It consists of emitting only the right phosphor on the one side of the screen by the G electron beam moved to the right as much as possible, and emitting only the left phosphor on the other side of the screen by the G electron beam moved to the left as much as possible. It is characterized by.

1 is a view showing a typical cathode ray tube

2 is a view for explaining a typical delta cathode ray tube and inline cathode ray tube,

3 is a circuit diagram showing a purity test apparatus for an inline cathode ray tube according to the present invention;

4 is a flowchart illustrating a purity test method of an inline cathode ray tube according to the present invention;

5 is a view for explaining the purity test apparatus and method of the in-line cathode ray tube according to the present invention.

Explanation of symbols on the main parts of the drawings

10: control means 20: video signal supply means

30: correction current supply means L1: left upper purity coil

L1 ': lower left purity coil L2: right upper purity coil

L2 ': Right lower purity coil OP 1,2: First and second OP amplifier

Q 1,2,3,4: Push-pull amplifier R 1,2,3,4,5,6,7,8,9,10: Resistance

C 1,2: Capacitor

Hereinafter, an embodiment of a method according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a circuit diagram illustrating a purity test apparatus for an inline cathode ray tube according to the present invention.

As shown in Fig. 3, the apparatus according to the present invention, in an inline type cathode ray tube in which RGB phosphors are arranged in a straight line, receives a purity test request from an operator in a production process to test whether the winding direction of the purity coil is correct. Control means 10 for outputting a high or low level third control signal S3 for outputting a first purity control signal S1 having a minimum value and a second purity control signal S2 having a maximum value; A video amplifier 20 for supplying a test G video signal to a G electron gun by the third control signal S3; A first purity correction current I1 having a maximum value in the negative (-) direction is output by the first purity control signal S1, and a positive direction is output in the positive direction by the second purity control signal S2. Correction current supplying means 30 for outputting a second purity correction current I2 having a maximum value; Only the R phosphors are wound around the corners of the cathode ray tube and move the G electron beam emitted from the G electron gun to the right as much as possible by the first purity correction current I1 supplied to the left purity coil L1.L1 '. Purity coil L1 which emits light and emits only B phosphor by moving the G electron beam emitted from the G electron gun to the left as much as possible by the second purity correction current I2 supplied to the right purity coil L2.L2 '. L1 ', L2, L2').

Here, the correction current supply means 30 is first connected to the first and second output terminals of the control means 10 to voltage amplify the first and second control signals S1 and S2 output from the control means 10. 2, the current amplifier amplifies the output signal voltage-amplified through the OP amplifiers OP1 and OP2 and the first and second OP amplifiers OP1 and OP2 to output to the purity coils L1.L1 ', L2, and L2'. And first and second push-pull amplifiers Q1, Q2, Q3, and Q4.

4 is a flowchart illustrating a purity test method of an inline cathode ray tube according to the present invention.

As shown in FIG. 4, the method according to the present invention is characterized in that, in the inline type cathode ray tube in which the purity coils L1, L1 ', L2, and L2' are respectively wound at the corners and the RGB phosphors are arranged in a straight line, Step S10 of inputting a test request from an operator in a production process to test whether a winding direction of a coil is correct; Generating a first purity control signal S1 having a minimum value and a second purity control signal S2 having a maximum value and simultaneously generating a third control signal S3 having a high or low level; (S30) the G electron gun to emit a G electron beam in response to the third control signal (S3); A first purity correction current I1 having a maximum value in the negative (-) direction is generated by the first purity control signal S1, and is generated in a positive (+) direction by the second purity control signal S2. Generating a second purity correction current I2 having a maximum value (S40); The first purity correction current I1 is supplied to the left purity coils L1 and L1 'to move the G electron beam to the right as much as possible, and the second purity correction current I2 is supplied to the right purity coils L2 and L2'. Step S50 to move the G electron beam to the left as far as possible; Only the R phosphor is emitted on the left side of the screen by the G electron beam moved to the right as much as possible, and only the B phosphor is emitted on the right side of the screen by the G electron beam moved to the left as much as possible (S60).

Next, the apparatus and method according to the present invention configured as described above will be described in detail with reference to FIGS. 3, 4 and 5.

First, a general purity control method will be described. As shown in FIG. 5A, a purity coil wound around a corner portion of a cathode ray tube generally includes a left upper purity coil L1 and a left lower purity coil L1. '), Right upper purity coil L2, and right lower purity coil L2'.

At this time, the control means 10 outputs the first purity control signal S1 for supplying the first purity correction current I1 to the left purity coils L1 and L1 ', and the right purity coils L1 and L1. A first purity control signal S1 for supplying the first purity correction current I1 to ') is output.

For example, since all of the purity control signals output from the control means 10 have 0 to 255 steps, the control means 10 corrects the first purity control signal S1 of 0 steps by the correction current supply means 30. ), The correction current supply means 30 supplies the first purity correction current I1 having the maximum value in the negative (-) direction to the left purity coils L1 and L1 ', and thus the left purity A predetermined electromagnetic field is formed in the coils L1 and L1 'to move the RGB electron beam to the right as far as possible.

On the contrary, when the control means 10 outputs the first purity control signal S1 of 255 steps to the correction current supply means 30, the correction current supply means 30 returns the maximum value in the positive direction (+). The first purity correction current I1 having is supplied to the left purity coils L1 and L1 ', whereby a predetermined electromagnetic field is formed in the left purity coils L1 and L1' to move the RGB electron beam to the left as far as possible.

If the control means 10 outputs the zero purity second purity control signal S2 to the correction current supply means 30, the correction current supply means 30 returns the maximum value in the negative (-) direction. The second purity correction current I2 having is supplied to the right purity coils L2 and L2 ', whereby a predetermined electromagnetic field is formed in the right purity coils L2 and L2' to move the RGB electron beam to the right as far as possible.

On the contrary, when the control means 10 outputs the second purity control signal S1 of 255 steps to the correction current supply means 30, the correction current supply means 30 returns the maximum value in the positive direction (+). The second purity correction current I2 having is supplied to the right purity coils L2 and L2 ', whereby an electromagnetic field is formed in the right purity coils L2 and L2' to move the RGB electron beam to the left as far as possible.

That is, the first and second purity correction currents I1 and I2 whose directions and magnitudes are changed by the first and second purity control signals S1 and S2 having 0 to 255 steps are respectively compared to the respective purity coils L1 and L1 ', L2, L2 '), a predetermined electromagnetic field is formed to adjust the purity by shifting the direction of the RGB electron beam emitted from the RGB electron gun from side to side.

Accordingly, in the present invention, since the phosphors are arranged in a straight line in the order of BGR on the fluorescent surface of the cathode ray tube as shown in FIG. 5 (b), whether the G electron beam emitted from the G electron gun reaches the G emitter correctly. Determine the good and bad of the purity characteristics.

First, when an operator makes a key input to test whether the purity coil is wound in the correct direction in the production process (S10), the control means 10 detects this and has a first purity control signal having a minimum value (0 step). A second purity control signal S2 having a maximum value (255 steps) S1 is outputted to the correction current supply means 30 and a third control signal S3 is outputted to the video amplifier 20 (S20). .

The video amplifier 20 generates a test G image signal by using a third control signal S3 and supplies the test G image signal to the G electron gun, and the G electron gun emits a G electron beam (S30).

The correction current supply means 30 outputs a first purity correction current I1 having a maximum value in the negative (−) direction by the first purity control signal S1 to the left purity coil L1.L1 '. (S40).

Accordingly, the G electron beam emitted from the G electron gun by the left purity coils L1 and L1 'is moved to the right as much as possible (S50), and as shown in FIG. 5 (d) by the G electron beam moved to the right as much as possible. Only the R phosphor emits light on the left side of the screen (S60).

On the other hand, the correction current supply means 30 transmits the second purity correction current I2 having the maximum value in the positive (+) direction by the second purity control signal S2 to the right purity coils L2 and L2 '. Output (S40).

Accordingly, the G electron beam emitted from the G electron gun by the right purity coils L2 and L2 'is moved to the left as far as possible (S50), and as shown in FIG. 5 (d) by the G electron beam moved to the left as far as possible. Only the B phosphor emits light on the right side of the screen (S60).

In conclusion, as shown in FIG. 5 (d), when R color appears on the left side of the screen and B color appears on the right side, it can be seen that the purity coil is wound in the correct direction. On the contrary, as shown in FIG. 5C, when B color appears on the left side of the screen and R color appears on the right side, it can be seen that the purity coil is wound in the opposite direction.

As described above, the apparatus and method of the present invention automatically test whether the direction of winding of the purity coil is correct in the production process of the inline type cathode ray tube, so that the operator can visually easily identify the defective product, thereby significantly reducing the defective rate. It has the effect.

Claims (2)

In an inline cathode ray tube in which RGB phosphors are arranged in a straight line, When the purity test request is input from the operator in the production process to test whether the winding direction of the purity coil is correct, the first purity control signal having the minimum value and the second purity control signal having the maximum value are output, and the high or low level is output. Control means for outputting a third control signal; Video signal supply means for supplying a test G video signal to a G electron gun by the third control signal; A first and second OP amplifiers connected to the first and second output terminals of the control means to voltage amplify the first and second control signals output from the control means, and output voltage amplified through the first and second OP amplifiers. And a first and second push-pull amplifiers for amplifying and outputting current, and outputting a first purity correction current having a maximum value in the negative direction by the first purity control signal or in both directions by the second purity control signal. Correction current supplying means for outputting a second purity correction current having a maximum value; Winding around the corner portion of the cathode ray tube, respectively, by moving the G electron beam emitted from the G electron gun to the right by the first purity correction current supplied to one of the left or right side to emit only the right phosphor relative to the G phosphor. And a purity coil configured to move the G electron beam emitted from the G electron gun to the left side as much as possible by the second purity correction current supplied to the other side to emit only the left phosphor based on the G phosphor. Purity test device. In an inline type cathode ray tube in which a Purity coil is wound around an edge portion and RGB phosphors are arranged in a straight line, A test request is input from an operator in the production process to test whether the winding direction of the purity coil is correct; Generating a first control signal having a minimum value and a second purity control signal having a maximum value and simultaneously generating a third control signal having a high or low level; Firing a G electron beam by a G electron gun by the third control signal; Generating a first purity correction current having a maximum value in a negative direction by the first purity control signal, and generating a second purity correction current having a maximum value in both directions by the second purity control signal; Supplying the first purity correction current to one side of a left purity coil or a right purity coil to move the G electron beam to the right as much as possible, and supplying the second purity correction current to the other side to move the G electron beam to the left as much as possible. ; It consists of emitting only the right phosphor on the one side of the screen by the G electron beam moved to the right as much as possible, and emitting only the left phosphor on the other side of the screen by the G electron beam moved to the left as much as possible. Purity test method of the in-line cathode ray tube, characterized in that.