JPH09223463A - Characteristic measuring apparatus for display apparatus and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus to measure characteristic of display apparatuses and which can lessen the burden of a user and measure the characteristics such as the degree of mis-landing inexpensively at high precision. SOLUTION: Photosensor housing parts 4a1 composed of a light-shielding elastic material such as rubber are attached to a display screen 11a of a display to be measured. A photosensor 5a1 is housed in the inside of each photosensor housing part 4a1 and light emitted out of the display apparatus 11a is detected by the photosensor 5a1. Based on the detection results, the degree of mis-landing, etc., is calculated.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a manufacturing process, etc.
The present invention relates to a display device characteristic measuring device and method for measuring a characteristic such as a mislanding amount in a display device such as a cathode ray tube (CRT).

[0002]

2. Description of the Related Art A color CRT used for a display such as a television receiver or a computer is provided with a metal part such as an aperture grill as a color selection electrode inside a glass panel. Such a color C
The metal component provided on the RT thermally expands due to the effects of electron beam irradiation and an increase in ambient temperature during the display operation. At this time, due to thermal expansion, the positional relationship of each component changes, and the mislanding amount changes. The mislanding amount is the amount of deviation between the arrival position of the electron beam on the inside of the display screen and the predetermined position formed by the phosphor and carbon on the inside of the display screen in the CRT.

The amount of mislanding affects the color purity and luminance distribution of television receivers using color CRTs and displays such as computers.
It is important in the process of adjustment and inspection after manufacturing of the color CRT. Therefore, the amount of mislanding is measured at the time of development of a new color CRT and management of each manufacturing lot.

In the conventional measurement of the amount of mislanding, a measurement mask 100 having a thickness of about 1 mm and having a plurality of openings 100a formed in a matrix as shown in FIG.
Fix it on the display screen of T with tape. At this time, the measurement mask 100 is fixed to the display screen along, for example, a line attached along the effective screen. Next, a user sequentially inserts and holds a photodetector into each of these openings 100a by hand, and detects light from a measurement point corresponding to the position of each opening 100a. Then, the mislanding amount at each measurement point is calculated based on the detection result of the photodetector. In the conventional measurement of the amount of mislanding, a photodetector in which a photosensor is housed inside a light-shielding cylinder is used.

[0005]

However, in the above-described conventional method for measuring the amount of mislanding, the user must hold the photodetector by hand in the opening 100a of the measuring mask 100, and There is a problem that the burden is heavy. Moreover, since the user holds the photodetector by hand, the posture of the photodetector at the measurement point becomes unstable. Therefore, for example, when the light amount is repeatedly measured at the same measurement point at different times, the positioning accuracy of the photodetector with respect to the measurement point is low, and there is a problem that the reliability of the data is lacking.

Further, since the photodetector used in the above-described conventional method for measuring the amount of mislanding has a photosensor housed inside the cylinder, a gap is generated between the cylinder and the display screen, and There is a problem that it is easily affected by light. Further, in the above-described conventional method for measuring the amount of mislanding, since the measurement mask 100 having the size corresponding to the size of the display screen is used, when the measurement is performed on the display screens having different sizes, the different measurement masks are used. However, there is a problem that the cost required for measurement becomes high.

The present invention has been made in view of the above-mentioned prior art, and an object of the present invention is to provide a characteristic measuring device for a display device and a method thereof capable of measuring the characteristic of the display device such as the mislanding amount with high accuracy and at low cost. .

[0008]

In order to solve the above-mentioned problems of the prior art and to achieve the above-mentioned object, a characteristic measuring apparatus for a display device according to the present invention measures an emission characteristic of an electron beam in the display device. A characteristic measuring device for a display device, wherein the suction means is suctioned to a predetermined area including a measurement point on the display screen of the display device, and the suction means is provided on the suction surface side of the suction means, and the suction means displays the Light detection means for detecting light emitted from the display screen in a state of being adsorbed on the screen,
And a calculation unit that calculates the emission characteristic of the electron beam at the measurement point based on the detection result of the light detection unit.

In the characteristic measuring device of the display device of the present invention, the suction means is sucked and fixed to the measurement point on the display screen, and the light amount at the measurement point is detected by the light detection means provided in the suction means. At this time, since the suction means is fixed on the display screen in a stable state, the light detection means can perform highly accurate light detection, and the characteristics of the display device can be calculated with high accuracy. Further, the user does not need to hold the light detecting means by hand at the measurement point during the measurement, and the burden on the user for the measurement is reduced.

Further, in the characteristic measuring device for a display device of the present invention, preferably, the adsorbing means is constructed by using a member which is substantially black and has a light shielding property.

Further, in the characteristic measuring device for a display device of the present invention, preferably, the light detecting means is sequentially moved to a measuring point for measuring.

Further, in the characteristic measuring device for a display device of the present invention, preferably, the photodetecting means is provided at each of the plurality of measuring points to measure the emission characteristic of the electron beam at the measuring point.

Further, the display device characteristic measuring method of the present invention is a display device characteristic measuring method for measuring the emission characteristic of an electron beam in the display device, and is a predetermined method including a measurement point on the display screen of the display device. The adsorption means is adsorbed to the area, and in a state where the adsorption means is adsorbed on the display screen, the light emitted from the display screen is detected by the light detection means provided on the adsorption surface side of the adsorption means, and the detection is performed. Based on the result, the emission characteristic of the electron beam at the measurement point is calculated.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A mislanding amount measuring apparatus and method according to an embodiment of the present invention will be described below. 1 is a configuration diagram of a mislanding amount measuring device according to the present embodiment, and FIG. 2 is a cross-sectional configuration diagram of a photosensor storage portion 4a1 and a photosensor 5a1 shown in FIG.
FIG. 3 is a plan view for explaining the arrangement of the photo sensor storage units 4a1 on the display screen. As shown in FIG. 1, the mislanding amount measuring apparatus according to this embodiment includes a gun center coil 2 and a measurement deflection yoke (DY).
3, measurement masks 4a1 to 4a63, photosensor 5a
It has 1-5a63 and the control part 6.

The gun center coil 2 is provided in the neck portion of the funnel 10 so as to be located on the electron beam emission side of the electron gun 12. Gun center coil 2
An alternating magnetic field is generated based on the control signal S6a from the control unit 6, and the electron beam emitted from the electron gun 12 is slightly swung (wobbling) in a predetermined direction. Control signal S
6a contains a direct current component and an alternating current component, and the direct current component determines the center position where the electron beam oscillates.

The deflection yoke 3 for measurement deflects the electron beam in the oscillated state by the alternating magnetic field from the gun center coil 2 on the basis of the control signal S6b from the control section 6 according to the measurement point, and the inner surface of the panel is deflected. The light is emitted toward the phosphor.

The photosensor storage section 4a1 is shown in FIGS.
As shown in FIG. 5, the suction cup portion 40 is made of an elastic member such as rubber and has a conical cylindrical shape, and the photosensor mounting portion 41 fixed to the top of the suction cup portion 40. The suction cup section 40 is made of, for example, a black light-shielding member in order to suppress the influence of external light on the photo sensor 5a1. Suction cup 40
Has a shape as shown in FIG. 2 (A) in the non-adsorbed state. On the other hand, in the suction state, the suction cup portion 40 is shown in FIG.
The diameter φ of the portion bonded to the display screen 11a is about 10 to 15 mm. This diameter is determined in relation to the distance between the measurement points and the suction force.

A photo sensor 5a1 is attached to the photo sensor attachment portion 41 so that its tip projects inside the suction cup portion 40. The detection result S5a1 of the photosensor 5a1 is obtained by the control unit 6 shown in FIG.
Is output to The configurations of the photo sensor storage units 4a2 to 4a63 and the photo sensors 5a1 to 5a63 are the same as those of the photo sensor storage unit 4a1 and the photo sensor 5a1 described above. The photosensor storage units 4a1 to 4a63 and the photosensors 5a1 to 5a63 are arranged in a matrix on the display screen 11a of the display 1 to be measured, as shown in FIG. The control unit 6 uses the photo sensor 5a1.
The mislanding amount at each measurement point is calculated based on the detection results S5a1 to 5a63 from .about.5a63.

That is, as shown in FIG. 2A, in the luminance distribution in the image pickup range of the photosensor 5, when the mislanding amount is "0", the peak has a peak as shown by the center line of the image pickup range. And the amount of light detected by the photosensor 5a1 is maximized at this time. on the other hand,
When the amount of mislanding is, for example, a negative predetermined value, the luminance distribution in the image pickup range of the photosensor 5 has a peak with respect to the centerline of the image pickup range as shown by a dashed line in FIG. Shift to the left side,
The light detection amount in the photo sensor 5a1 is lower than that in the case where the mislanding amount is "0".

In the mislanding amount measuring apparatus shown in FIG. 1, the electron beam is slightly swung by the alternating magnetic field from the gun center coil 2 shown in FIG. And FIG.
As shown by the dotted line in (A), the DC component of the current flowing through the gun center coil 2 is detected when the center of the imaging range and the maximum point of the luminance distribution match. Next, for example, the mislanding amount is calculated from the detected DC component using table data that shows the relationship between the DC component of the current and the movement amount of the electron beam that is prepared in advance. The measurement of the mislanding amount at the 63 measurement points defined on the display screen is performed one by one by the switching method.

A method of measuring the mislanding amount using the mislanding amount measuring device shown in FIG. 1 will be described below. First, for example, as shown in FIG. 3, the user adsorbs the photosensor storage sections 4a1 to 4a63 to 63 measurement points that are positioned in a matrix on the display screen 11a of the display 1 to be measured. . At this time, the scale (scale) or the like is used to accurately position and adsorb the photosensor storage units 4a1 to 4a63 to the respective measurement points defined on the display screen.

The magnetic field from the gun center coil 2 causes the electron beam from the electron gun 12 to oscillate. This electron beam responds to the control signal S6b from the control unit 6 by
Deflection is performed in the measurement deflection yoke 3. Next, this electron beam reaches the fluorescent substance located inside the display screen 11a, and makes the fluorescent substance of the said part light-emit. At this time, on the display screen 11a, for example, R (red), G
The emission of all (green) and B (blue) phosphors is performed by the full raster method, and the oscillation of the electron beam is performed at each measurement point. In the present embodiment, for example, only the G fluorescent substance may be made to emit light. Then, the light from the phosphor is emitted from the display screen 11a and detected by the photosensors 5a1 to 5a63, and the detection results S5a1 to 5a63 of the photosensors 5a1 to 5a63 are sequentially output to the control unit 6 by the switching method. The controller 6 calculates the mislanding amount at each measurement point based on the detection results S5a1 to 5a63.

As described above, according to the mislanding amount measuring apparatus and method according to the present embodiment, the user does not need to hold the photosensor at the measuring point by hand, and the burden on the user is reduced. It Further, as described above, the photosensor storage units 4a1 to 4a63 and the photosensors 5a1 to 63a1 are arranged in parallel at the 63 measurement points.
By arranging 5a63, when the measurement is performed by one person, the measurement work can be performed in about 10 minutes, and the work time can be significantly shortened. On the other hand, when the photosensor is moved to each measurement point as in the conventional case, the work time of about 20 minutes is required for two measurers. Further, according to the mislanding amount measuring apparatus and method according to the present embodiment, since the photosensor storage units 4a1 to 4a63 are accurately and stably adsorbed and fixed to the measurement points by using a scale or the like, Accurate measurement can be performed.

Further, according to the mislanding amount measuring apparatus and method according to the present embodiment, the photosensor storage portions 4a1 to 4a63 are constructed by using a black member having a light shielding property, and further, the photosensor storage portions 4a1 to 4a1. 4a63
Since the display screen 11a and the display screen 11a are in close contact with each other, highly accurate data can be obtained with little influence of external light.
Further, according to the mislanding amount measuring apparatus and method according to the present embodiment, since the measuring mask is not used, the same apparatus can be used to measure the displays to be measured having the display screens of different sizes. Therefore, the cost can be reduced.

The present invention is not limited to the above embodiment. For example, the shape and dimensions of the suction cup portion 40 shown in FIG. 2 are not limited to those described above, and the suction cup portion 40 can be arbitrarily deformed according to the suction force, the positional relationship between the measurement points, and the like.
Further, in the above-described embodiment, the combination of a plurality of photosensor storage units and photosensors is illustrated as a case where they are simultaneously arranged in parallel at a plurality of measurement points, but the present invention is, for example, a single photosensor storage unit and You may make it move a combination of photosensors one by one and may measure several measurement points.

[0026]

As described above, according to the characteristic measuring device and method of the display device of the present invention, the measurement of the characteristic of the display device can be performed with high accuracy while reducing the burden on the user (measuring person). It can be done cheaply.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a mislanding amount measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional configuration diagram of a photo sensor storage unit and a photo sensor shown in FIG.

FIG. 3 is a plan view for explaining an arrangement of photosensor storage units on a display screen.

FIG. 4 is an external perspective view of a measurement mask used in a conventional mislanding amount measuring apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Display for measurement, 2 ... Gun center coil, 3 ... Deflection yoke for measurement, 4a1-4a63 ... Photo sensor storage part, 5a1-5a63 ... Photo sensor, 6 ... Control part, 11 ... Panel, 12 ... Electron gun

Claims (5)

[Claims] 1. A characteristic measuring device of a display device for measuring an emission characteristic of an electron beam in a display device, comprising: a suction means for adsorbing to a predetermined region including a measurement point on a display screen of the display device; Means for detecting light emitted from the display screen in a state in which the suction means is sucked onto the display screen, and the measurement based on the detection result of the light detection means. A characteristic measuring device for a display device, comprising: a calculating unit that calculates the emission characteristic of the electron beam at a point. 2. The characteristic measuring device for a display device according to claim 1, wherein the adsorbing means is configured by using a member that is substantially black and has a light shielding property. 3. The characteristic measuring device for a display device according to claim 1, wherein the light detecting means is sequentially moved to a measuring point for performing the measurement. 4. The characteristic measuring device for a display device according to claim 1, wherein the light detecting means is provided at each of the plurality of measuring points to measure the emission characteristic of the electron beam at the measuring points. 5. A characteristic measuring method of a display device for measuring an emission characteristic of an electron beam in a display device, comprising: adsorbing a suction means onto a predetermined area including a measurement point on a display screen of the display means, said suction means Is adsorbed on the display screen, detects the light emitted from the display screen by the light detection means provided on the adsorption surface side of the adsorption means, based on the detection result, the electron at the measurement point. A method for measuring the characteristics of a display device for calculating the emission characteristics of a beam.