JP2001006555A - Convergence adjusting method, convergence adjustment assisting device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct convergence adjustment by eliminating effects of thermal deformation of the aperture grille to adjust the convergence. SOLUTION: The convergence of a colored cathode-ray tube is adjusted by applying a heater power to an electron gun of the colored cathode-ray tube (S1), and then emitting an electron beam from the electron gun of the colored cathode-ray tube after a predetermined period (S3). By this method, the electron beam is not emitted from the electron gun of the colored cathode-ray tube for the predetermined period and thermal deformations are not generated in an aperture grille of the colored cathode-ray tube. Therefore, when adjusting the convergence in a manufacturing process of the colored cathode-ray tube or under setting condition, effects of thermal deformation of the aperture grille can be eliminated to correct the convergence adjustment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convergence adjustment method, a convergence adjustment support device and a display device, and more particularly to a convergence adjustment method and a convergence adjustment method applied to a process of manufacturing a color CRT or a display device such as a television receiver or a monitor device. The present invention relates to a support device and a display device.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view of a color CRT. The illustrated color cathode ray tube 1 has a vacuum glass bulb 5 composed of a face panel part 2, a funnel part 3, and a neck part 4, an electron gun 6 provided inside the neck part 4, and a purity magnet part provided outside the neck part 4. 7 and a deflection yoke portion 8 provided on the funnel portion 3 for deflecting each of the R (red), G (green), and B (blue) electron beams 9 to 11 emitted from the electron gun 6. Electromagnetic deflection is performed by the magnetic force of the section 8, and dots on the fluorescent screen 13 inside the face panel section 2 are selectively illuminated via the aperture grill 12.

FIG. 6 shows an aperture grill 12 and a phosphor screen 1.
FIG. 3 is an enlarged view of a main part of FIG.
11 show a state in which light is irradiated onto three dots 13a to 13c of the phosphor screen 13 through slits (hereinafter, referred to as “small holes”) 12a of the aperture grill 12. The three dots 13a to 13 are R, G, and B, respectively.
Are fluorescent dots in a stripe shape having each emission color of
By changing the intensity of each of the electron beams 9 to 11, an arbitrary color development including an achromatic color can be obtained.

When the electron beams 9 to 11 are not aligned (concentrated) at the positions of the small holes 12a of the aperture grill 12, a so-called misconvergence cannot be obtained and a desired color is not obtained. Static convergence adjustment (static convergence adjustment) is indispensable.

[0005] Static convergence adjustment (hereinafter, simply referred to as "convergence adjustment") refers to a method in which an appropriate test pattern such as cross hatching is displayed and the relative rotation angle of the magnet ring pair of the purity magnet unit 7 is adjusted. This is an operation of aligning each of the R, G, and B light emitting dots at the cross position of the test pattern while changing them. For example, in the case of a color CRT having two, four, and six pole magnet ring pairs,
First, adjust the rotation angle of the two-pole magnet ring pair to align the green dot with the cross position, and then adjust the rotation angle of the four-pole magnet ring pair to overlap the red dot and the blue dot. The work flow is to adjust the rotation angle of the six-pole magnet ring pair so that the red dot and the blue dot are aligned with the cross position.

[0006]

However, the conventional convergence adjustment does not take into account the thermal deformation of the aperture grille due to the irradiation of the electron beam. There was a problem that adjustment results could not be obtained.

The reason will be described. The size and the interval of the small holes 12a of the aperture grill are extremely fine, and it is inevitable that the size and the interval slightly change (thermal deformation) due to the heat generated by the irradiation of the electron beams 9 to 11. This thermal deformation causes the centers of the electron beams 9 to 11 to deviate from the center of the small holes 12a, causing so-called mislanding. However, the drift of the landing (shift on the time axis) becomes, for example, about 3 hours. 70%
Whereas the convergence drift is fast enough to reach 70% of its peak in about 10 minutes due to thermal deformation of each part of the electron gun due to heater heating.

For this reason, for example, even if convergence adjustment is performed about 10 minutes after the power of the heater is turned on, only a slight mislanding appears with such an electron beam irradiation time. This is because the convergence adjustment performed in this manner does not exactly match the mislanding amount in actual use (the amount when the electron beam is irradiated for about 3 hours according to the above example).

Accordingly, an object of the present invention is to optimize convergence adjustment by performing convergence adjustment while eliminating the influence of thermal deformation of the aperture grill.

[0010]

According to the convergence adjustment method of the present invention, when performing convergence adjustment of a color cathode ray tube, first, a heater power supply is applied to an electron gun of the color cathode ray tube, and then, after a predetermined time elapses. The convergence adjustment is performed by emitting an electron beam from the electron gun of the color cathode ray tube. A convergence adjustment support device according to claim 2, wherein the heater power supply means for supplying heater power to the electron gun of the color cathode ray tube, and the heater power supply means starts supplying heater power to the color cathode ray tube for a predetermined time. And electron beam emission control means for emitting an electron beam from the electron gun of the color cathode ray tube after the lapse of time. The display device according to claim 3,
A color cathode ray tube, a heater power supply means for supplying heater power to the electron gun of the color cathode ray tube, and a predetermined time after the supply of heater power to the color cathode ray tube is started by the heater power supply means, the color cathode ray tube Electron beam emission control means for emitting an electron beam from an electron gun.
According to any one of the first to third aspects, an effect is obtained in that the electron beam is not emitted from the electron gun of the color cathode ray tube for a predetermined time, and the aperture grill of the color cathode ray tube does not undergo thermal deformation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings, taking a color CRT production line as an example.

First, the configuration will be described. In FIG. 1, a large number of base plates 21 are placed on a conveyor 20. In this case, the base plate 21 is conveyed clockwise (in the direction of the outlined arrow) by the conveyor 20 and is positioned at an arbitrary position. The process is stopped for each of the assembling process 22, the adjusting process 23, and the inspection process 24. That is, the base plate 21
When the machine reaches the process position, the assembly, adjustment, and inspection operations are performed automatically, manually, or a combination thereof.

For example, in the assembling step 22, the glass bulb 5,
The purity magnet section 7 and the deflection yoke section 8 are assembled, and the assembled color cathode ray tube 1 is passed to an adjustment step 23, and various adjustment operations including convergence adjustment are performed in the adjustment step 23 to complete the adjustment. The cathode ray tube 1 is transferred to the inspection step 24, a required inspection is performed in the inspection step 24, and a passed product is taken out from the conveyor 20, while a rejected product is returned and put on the conveyor 25.

FIG. 2 is a block diagram of the convergence adjustment support device used in the adjustment step 23. The convergence adjustment support device 30 takes in a camera 31 for photographing the display screen of the color cathode-ray tube 1 and an image signal 32 photographed by the camera 31, and executes a control program (see the flowchart in FIG. 3) stored in the memory 33. Various control signals (for example, a deflection signal 34, a grid signal 35, a heater signal 36, an anode signal 37, etc.) necessary to execute the convergence adjustment operation of the color cathode ray tube 1
And a display unit 39 for generating a display signal 39 for displaying appropriate guidance information on the display 38.
And an input device 41 such as a keyboard and a mouse, and a deflection driving unit 42 that converts the deflection signal 34 into a deflection voltage and outputs the deflection voltage.
And an electron gun driving unit 43 that converts the grid signal 35 into each grid voltage of the electron gun and outputs the same, and a heater voltage generating unit 44 that turns on and off a heater voltage applied to the heater electrode of the color CRT 1 in response to the heater signal 36. And a high voltage generator 45 for turning on and off a high voltage applied to the anode electrode of the color cathode-ray tube 1 in response to the anode signal 37.

Next, the operation of the adjusting step will be described. First,
When the base plate 21 is carried to the adjustment process 23, the base plate 2
Each part of the color CRT 1 mounted on the apparatus 1 and each part of the convergence adjustment support device 30 are connected by a predetermined cable. That is, the deflection yoke section 8 of the color cathode ray tube 1 and the deflection drive section 42 of the convergence adjustment support device 30 are connected by a predetermined cable, and the electrode at the rear end of the neck portion of the color cathode ray tube 1 and the electronic device of the convergence adjustment support device 30 are connected. The gun drive unit 43 and the heater power generation unit 44 are connected by a predetermined cable, and the anode electrode of the color cathode ray tube 1 and the high voltage generation unit 45 of the convergence adjustment support device 30 are connected by a predetermined cable.

Next, with the camera 31 facing the center of the screen of the color cathode ray tube 1, the input device 41 is operated to start the execution of the control program in the control section 36.

FIG. 3 is a flowchart showing a main part of the control program. When you start this program,
First, in step S1, the heater signal 36 is turned on,
After waiting for a predetermined time Td in step S2, step S3
Required grid signal 35 necessary for convergence adjustment
Occurs. Then, a display signal 39 including necessary guidance information necessary for the adjustment is generated and output to the display 38. Thereafter, the program is terminated in response to an adjustment work end command or the like entered into the input device 41. I do.

Here, the feature of the illustrated program is that a grid signal 35 is generated after a lapse of a predetermined time Td since the heater signal 36 is turned on. The grid signal 35 is, for example, an appropriate signal for displaying the cross-hatching test pattern described above at the beginning on the color cathode-ray tube 1. An important point is that the grid signal 35 is not generated during the non-generation period (the predetermined time Td). During this period, the heater power is supplied to the electron gun of the color cathode-ray tube 1, but no electron beam is emitted from the electron gun because no grid signal is supplied.

Therefore, the aperture grill of the color cathode-ray tube 1 is not thermally deformed during the predetermined time Td. Therefore, even if the convergence adjustment is performed by generating the grid signal 35 after the predetermined time Td has elapsed, As a result of only a small amount of mislanding, a special effect is obtained in which convergence adjustment can be performed while eliminating the influence of thermal deformation of the aperture grill.

Although the above embodiment is an example of application to the manufacturing process of the color cathode ray tube 1, the scope of the present invention is not limited to this. For example, the present invention can be applied to a display device such as a television receiver or a monitor device. This is because, even in these display devices, it is necessary to appropriately adjust the convergence of the color CRT 1 in consideration of the influence of the magnetic field generated from the internal circuit.

In FIG. 4, the display device 50 is, for example,
It is a television receiver, a monitor device, or the like, and incorporates the color cathode ray tube 1 to which the purity magnet unit 7 and the deflection yoke unit 8 are attached, and various peripheral circuits for driving the color cathode ray tube 1, for example, an anode of the color cathode ray tube 1. High voltage generating circuit 5 for generating voltage
1. Deflection circuit 5 for converting deflection signal 52a into deflection voltage
2. A grid voltage generating circuit 53 for converting the grid signal 53a into a grid voltage of the color cathode-ray tube 1, a heater voltage generating circuit 54 for generating a heater voltage for the color cathode-ray tube 1, and the like are incorporated.

Here, the grid voltage generation circuit 53 has a first function of converting the grid signal 53a into a grid voltage and supplying the grid voltage to the grid electrode of the electron gun of the color cathode-ray tube 1, and a heater from the heater voltage generation circuit 54. It has a second function of applying a voltage to the heater electrode of the electron gun of the color cathode-ray tube 1, and further turns on and off the first function and the second function in response to activation / inactivation of a predetermined control signal SC. It has a third function of controlling.

The third function is to turn on both the first function and the second function while the control signal SC is inactive. That is, the grid signal 53a is converted into a grid voltage and applied to the grid electrode of the electron gun of the color cathode ray tube 1, and the heater voltage from the heater voltage generation circuit 54 is applied to the heater electrode of the electron gun of the color cathode ray tube 1. Although this operation is a natural operation for the display device 50 such as a television receiver or a monitor device, the third function further includes the first function for a predetermined time Td after the control signal SC is activated. A characteristic operation of turning on only the second function while keeping it off is performed. That is, the operation is performed such that only the heater voltage is applied to the color CRT 1 in a state where the grid voltage is not applied to the color CRT 1 for the predetermined time Td. This characteristic operation of the third function (operation for a predetermined time Td after the control signal SC becomes active) is specially provided for convenience of convergence adjustment.

This is because the third function operates during the predetermined time Td after the control signal SC is activated.
Since an electron beam is not emitted from the electron gun of the color cathode ray tube 1, thermal deformation does not occur in the aperture grille. As a result, even if the convergence adjustment is performed after a predetermined time Td, the mislanding amount at that time becomes small. This eliminates the influence of the thermal deformation of the aperture grill, and provides a special effect that convergence adjustment can be performed in the set state.

In the above-described embodiment, an aperture grill-shaped color cathode-ray tube having a stripe-shaped fluorescent screen layer is taken as an example. However, the present invention is not limited to this. Of course, the present invention can also be applied to a color CRT having a shadow mask and circular fluorescent dots.

[0026]

According to the convergence adjustment method of the first aspect, when performing convergence adjustment of a color cathode ray tube, first, a heater power supply is applied to an electron gun of the color cathode ray tube, and then, after a lapse of a predetermined time, the color power source of the color cathode ray tube is heated. Since the convergence adjustment is performed by emitting the electron beam from the electron gun of the cathode ray tube, the electron beam is not emitted from the electron gun of the color cathode ray tube for a predetermined time, and the aperture grill of the color cathode ray tube does not undergo thermal deformation. As a result, at the time of the convergence adjustment in the manufacturing process of the color CRT or in the set state, the effect of the thermal deformation of the aperture grille can be eliminated and the convergence adjustment can be optimized. According to the convergence adjustment support device of the second aspect, a heater power supply means for supplying heater power to the electron gun of the color cathode ray tube, and a predetermined time after the supply of heater power to the color cathode ray tube by the heater power supply means is started. Electron beam emission control means for emitting an electron beam from the electron gun of the color cathode ray tube after a lapse of time, so that the electron beam is not emitted from the electron gun of the color cathode ray tube for a predetermined time, and the aperture of the color cathode ray tube is The effect that the grill does not undergo thermal deformation is obtained, and as a result, the convergence adjustment in the color cathode ray tube manufacturing process can be eliminated by eliminating the effect of the aperture grill thermal deformation. Is obtained. According to the display device of claim 3, a color cathode ray tube, heater power supply means for supplying heater power to an electron gun of the color cathode ray tube,
Electron beam emission control means for emitting an electron beam from the electron gun of the color cathode ray tube after a lapse of a predetermined time from the start of supply of heater power to the color cathode ray tube by the heater power supply means. During this period, the electron beam is not emitted from the electron gun of the color cathode ray tube, and the effect that the aperture grill of the color cathode ray tube does not undergo thermal deformation is obtained.As a result, when adjusting the convergence in the set state of the color cathode ray tube,
The effect that the influence of the thermal deformation of the aperture grille can be eliminated and the convergence adjustment can be optimized can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a manufacturing process to which the present invention is applied.

FIG. 2 is a configuration diagram of a convergence adjustment support device to which the present invention is applied.

FIG. 3 is a flowchart of a control program in the convergence adjustment support device.

FIG. 4 is a main part configuration diagram of a display device such as a television receiver or a monitor device to which the present invention is applied.

FIG. 5 is a structural diagram of a color CRT.

FIG. 6 is an enlarged view of a main part of an aperture grill and a fluorescent screen of a color CRT.

[Explanation of symbols]

Td: predetermined time, 1: color cathode ray tube, 6: electron gun, 30: convergence adjustment support device, 40:
Control section (electron beam emission control means) 43 ... Electron gun drive section (electron beam emission control means) 44 ... Heater voltage generation section (heater power supply means) 50 ... Display device 5
3 ... grid voltage generation circuit (electron beam emission control means), 54 ... heater voltage generation circuit (heater power supply means)

Claims (3)

[Claims] When performing convergence adjustment of a color cathode ray tube, first, a heater power supply is applied to an electron gun of the color cathode ray tube, and then, after a lapse of a predetermined time, an electron beam is emitted from the electron gun of the color cathode ray tube to achieve convergence. A convergence adjustment method characterized by performing adjustment. 2. A heater power supply means for supplying heater power to an electron gun of a color cathode ray tube, and after a lapse of a predetermined time from the start of supply of heater power to the color cathode ray tube by the heater power supply means, A convergence adjustment support device, comprising: electron beam emission control means for emitting an electron beam from an electron gun. 3. A color cathode ray tube; heater power supply means for supplying heater power to an electron gun of the color cathode ray tube; and elapse of a predetermined time from the start of supply of heater power to the color cathode ray tube by the heater power supply means. And an electron beam emission control unit for emitting an electron beam from the electron gun of the color cathode ray tube later.