JPH04181632A - Luminance measuring device for luminous element phosphor - Google Patents

Abstract

PURPOSE:To improve a production yield with a defective element previously eliminated by providing a supporting member for a display element, emitting light by receiving the irradiation of electrons, in an outer vessel having an electron gun and a grid, and measuring luminous luminance with a luminance meter outside the vessel. CONSTITUTION:A display element 1a is locked to the supporting member 38 in an outer vessel 31, and the vessel 31 inside is vacuumized. Then electron beams are emitted from the cathode 33 of an electron gun to irradiate an element 1a. At that time, the irradiated quantity of the beam is controlled with a grid 34. This causes the luminescence of the phosphor of the element 1a, and the luminous luminance is measured through an observation window 35 with a luminance meter 36. Then luminance data are arithmetically processed with a computer 37 to exclude the element 1a below a standard value. The removal of the defective element 1a in a stage before assembling in this manner causes the improvement of the production yield of a finished product, allowing the reduction of manufacturing costs.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a luminance measuring device for a phosphor for a light emitting element, which measures the luminance of a light emitting element of a light emitting element serving as a pixel of a large screen display device, particularly a color display device. It is related to.

[Conventional technology]

FIG. 4 is an exploded perspective view showing a conventional light emitting device disclosed in, for example, Japanese Patent Application Laid-Open No. 62-10849. In the figure, 1a is a display member coated with a phosphor 9, 1b is a spacer, and 1c is a display member coated with a phosphor 9. is a substrate (rear panel) on which various control electrodes are arranged. These are combined as shown in FIG. 5 to constitute the vacuum container 1 of the display tube. 2 is a linear cathode,
3 is a first control electrode (scanning electrode), and 4 is a second control electrode (data electrode). 5 and 6 are wiring patterns that commonly connect the control electrodes 3 and 4 in the row and column directions, respectively; 7 is a shielding electrode provided with an opening corresponding to the light emitting section;
8 is an opening provided in the shielding electrode 7, and 10 is an exhaust part. Further, a thin aluminum film is deposited on the phosphor 9 to increase luminous efficiency.

FIG. 6 shows the arrangement and wiring of two types of electrodes 3 and 4.

81 to S4 are extended portions of the scanning electrodes 3 commonly connected in the row direction, and D1 to D4 are extended portions of the data electrodes 4 commonly connected in the column direction. Also, Fig. 7 is a timing chart of signals applied to each electrode, Fig. 8 is an explanatory diagram showing the correspondence between the pixel arrangement and the electrodes, and Fig. 9 is an explanation of the potential of each electrode and the flow of electrons. Operation diagram, 1st
FIG. 0 is a front view of a display in which a large number of light emitting elements are arranged.

Next, the operation will be explained.

The basic principle of this type of display device is that thermionic electrons emitted from the cathode 2 are accelerated and collided with 11 poles, thereby exciting the phosphor 9 coated on the anode surface and emitting one light. That is, in FIG. 8, thermionic electrons emitted from the cathode 2 are transferred to a first control electrode (hereinafter referred to as a scanning electrode) 3 and a second control electrode (hereinafter referred to as a data electrode) 4.
It behaves in a first-order manner depending on the combination of potentials.

■ When the scanning electrodes 3 connected in the row direction and the data electrodes 4 connected in the column direction are both positive with respect to the cathode 2, electrons emitted from the cathode 2 due to the positive potential of the data electrodes 4 are transferred to the scanning electrodes. It is deflected by the potential of 3, passes through a predetermined opening 8, reaches the anode, and causes the phosphor 9 to emit light.

(2) When the scanning electrode 3 is positive and the data electrode 4 is negative, the negative potential of the data electrode 4 near the cathode 2 makes the potential near the cathode 2 negative, suppressing the emission of thermoelectrons. Therefore, the phosphor 9 does not emit light.

(2) When the scan electrode 3 is negative and the data electrode 4 is positive, there are two cases as follows.

a When the other scanning electrode 3 is positive, the thermoelectrons emitted from the cathode 2 are deflected toward the other scanning electrode 3 by the potential of the scanning electrode 3, and the phosphor 9 does not emit light.

b If the other scanning electrode 3 is also negative, the potential of the data electrode 4 is positive, but because the area of the data electrode 4 is small, the area near the cathode 2 is negative due to the influence of the negative potential of the scanning electrodes 3 on both sides. Next door.

The phosphor 9 whose emission of thermoelectrons is suppressed does not emit light.

■ If both scan electrode 3 and data electrode 4 are negative.

The potential near the cathode 2 becomes negative, the emission of thermoelectrons is suppressed, and the phosphor 9 does not emit light.

As a result, due to the wiring relationship shown in FIG. 6 and the relationship with the pixel arrangement shown in FIG. will emit light. First, when a signal is applied to the lead-out portion S1, the fluorescent portions P11 to P14 are selected and emit light according to the potential of the lead-out portion DI-D4 of the data electrode 4.

Next, when a signal is applied to the lead-out portion S2, the fluorescent portion P2
1 to P24 are selected, and light is emitted according to the potentials of the lead-out portions D1 to D4 of the data electrode 4. In this way, a sequential scanning signal as shown in FIG. 7 is applied to each lead-out portion 81 to S4 of the scanning electrode 3.

Any display can be obtained by applying a data signal to any one of the lead-out portions D1 to D4 of the data electrode 4. FIG. 10 shows a display in which a large number of light emitting elements are arranged.One light emitting element is Al.

Light-emitting elements Al,
Between the pixels in A2 (between the phosphors), there is a light emitting element Al, A2
A space T2 that is twice or more the dead space (width T1) at the periphery is required. Also.

The luminance of the light emitting elements is checked by turning them on after each light emitting element is assembled.

[Problem to be solved by the invention] Since the conventional light emitting elements are configured as described above, the luminance, which is the most important performance of the light emitting elements Al and A2, is 1.
It is possible to understand this for the first time by connecting the light-emitting elements Al and A2 to a prescribed power source and lighting them up. In this case, if the luminance of each light-emitting element Al and A2 is below a prescribed level, they can be discarded. The only way to do so is to dispose of the product, and as a result, there were problems such as poor production yield and uneconomical results.The invention claimed in the first claim was made to solve the above problems. R,G.

For light emitting devices, it is possible to check in advance the performance of only the display member coated with B color phosphor, thereby avoiding the uneconomical waste of discarding the light emitting devices after assembly, and improving production yield. The purpose is to obtain a luminance measurement device for phosphors.

In addition to the above-mentioned object, the invention according to the second claim also provides a method for depositing a metal vapor deposited film on the display member in an outer container in which the luminance measurement is performed before measuring the luminance of the phosphor on the display member. An object of the present invention is to obtain a luminance measuring device for a phosphor for a light emitting element that can be formed.

[Means to solve the problem]

The luminance measuring device for a phosphor for a light-emitting device according to the invention of the first claim includes a display member having a phosphor that emits light when irradiated with electrons in an outer container having an electron gun and a grid. With a luminance meter installed outside the outer container with a support member,
The luminance of the phosphor is measured.

Further, the luminance measuring device for a phosphor for a light emitting element according to the second claim of the present invention includes a metal thin film on the element member in an outer container housing a cathode of an electron gun, a grid, and a support member for the element member. This is a boat equipped with vaporized metal for vapor deposition.

[Effect]

The support member in the invention of the first claim removably supports a display member having a phosphor in an electron irradiation part, and measures the luminance of the phosphor emitted by the electron irradiation using a luminance meter. By making it observable and comparing this measurement result with, for example, a reference value, it is possible to identify the luminous performance of the phosphor, and to discard only display members that are less than the reference value.

Further, in the boat according to the second claim of the invention, a lump of vapor-deposited metal such as aluminum is accommodated, and the vapor-deposited metal is evaporated by heating in a vacuum, and the metal vapor is attached to the display member and the metal vapor is deposited on the display member. Enables formation of thin films. This allows the outer container to be used both as a vacuum deposition tank and as a luminance measuring device.

[Embodiments of the invention]

An embodiment of the invention according to the first claim will be described below with reference to the drawings. In FIG. 1, 31 is an outer container, which has a structure that can withstand a predetermined vacuum pressure. 32 is the outer container 31
33 is a cathode of an electron gun for irradiating the display member 1a with electrons, 34
3 is a grid for controlling the amount of electron irradiation; 35 is an observation window made of transparent glass for observing the degree of light emission from the display; 36 is a luminance meter for quantitatively understanding the luminance; 37 is luminance. A computer for organizing data. Further, 38 is a member that supports the display member 1a on the electron irradiation section inside the outer container 31.

In this embodiment, there are parts that do not directly affect the effects of the present invention, namely, the heating power source for the cathode 33 of the electron gun and the power source for the grid 34 of the electron gun.

Details such as the acceleration power source and the holding mechanism of the display section are omitted.

Next, the operation will be explained.

First, a door (not shown) is opened and the display member 1a to be checked, which has been subjected to aluminum vapor deposition, is locked to the support member 38 inside the outer container 31. Next, close the door and vacuum the inside of the outer container 31! 32 to evacuate and create a vacuum. Next, an electron beam is emitted from the cathode 33 of the electron gun, and the display member 1a is irradiated with the electron beam. The diameter of the electron beam at this time is adjusted by the voltage applied to the grid 34, and the diameter of the electron beam is adjusted by the voltage applied to the grid 34.
Make it large enough to completely cover the entire area.

When the display member 1a is irradiated with the electron beam in this manner, the phosphor 9 coated on the display member 1a emits light. Therefore, the luminance of the phosphor 9 is measured from outside the observation window 35 using a luminance meter 36.

Next, the brightness data measured by the brightness meter 36 is processed by the computer 37, and if the measured brightness is less than the reference brightness, the display member 1a is removed so as not to be used for assembling a light emitting element. In this way, by removing the display member 1a of poor quality before assembling the light emitting element, the yield of finished products can be improved, and by disposing of only the display member 1a, the uneconomical cost of manufacturing can be minimized. It can be suppressed.

In the above embodiment, one display member 1a fixed to the support member 38 is checked for brightness, but as shown in FIG. By locking a plurality of display members 1a to the display member 38A and moving each display member 1a to a position where it receives the electron beam by rotating the support member 38A, the brightness check of each of the plurality of display members 1a can be carried out efficiently. can do.

FIG. 3 shows an embodiment of the invention according to the second claim. This is provided with a boat 41 such as an iron container equipped with heating equipment such as tungsten inside an outer container 31.
1 can contain a lump of vapor-deposited metal 42 such as aluminum. Further, the support member 38A is, for example, a motor 39.
This makes it possible to rotate by a certain angle at a predetermined timing, and also allows for continuous rotation. That is, when measuring the luminance of the phosphor 9, the outer container 31 is used as a luminance measuring container, and when the support member 38A is intermittently rotated to deposit aluminum on the phosphor 9 of one display member, the outer container 31 is used as a vacuum deposition tank. 31, the support member 38A is configured to rotate continuously. Note that other components that are the same as those shown in FIG. 2 are designated by the same reference numerals, and redundant explanation thereof will be omitted.

Next, the operation will be explained.

First, before measuring the luminance of the phosphors 9, a plurality of display members 1a holding the phosphors 9 are locked on the support member 38A, and the vacuum bag W32 is activated to remove the outer container. 3
Evacuate the inside of 1 to create a vacuum state. In addition, the motor 39
is driven to rotate this support member 38A at a constant speed. Furthermore, in parallel with this, the boat 41 is heated by a heating device.

The aluminum lump that is the evaporated metal 42 in this boat 41 is evaporated. As a result, the aluminum vapor adheres to the surface of the rotating element member 1a with a uniform thickness. Therefore, the phosphor 9 is covered with a thin aluminum film to increase luminous efficiency.

Next, the electron beam from the cathode 33 of the electron gun is applied to the display member 1a covered with such a thin aluminum film.
The irradiance is controlled and projected by the grid 34, and the luminance of the phosphor 9 is measured by the luminance meter as described above. In this brightness measurement step, by intermittently rotating the motor 39 by a predetermined angle, the phosphor of each display member 1a can be adapted to the irradiation position of the electron beam. In this way, by arranging the electron beam irradiation mechanism and the metal thin film deposition mechanism in parallel in the outer container 31, which is a single vacuum container, it is possible to reduce the cost of equipment and simplify and streamline the work process. .

〔Effect of the invention〕

As described above, according to the invention according to the first claim,
A support member for a display member having a phosphor that emits light when irradiated with electrons is provided inside an outer container with an electron gun and a grid, and a luminance meter installed outside the outer container measures the phosphor. Since the configuration is configured to measure the luminance, based on the measurement results of the luminance before assembling the light emitting element,
By removing poor-quality display materials in advance, it is possible to eliminate the need to incorporate them into light-emitting elements, thereby improving the production yield and economic efficiency of light-emitting elements and reducing the overall manufacturing cost of the product. It has the effect of

According to the invention according to the second claim, a vapor-deposited metal boat for depositing a metal thin film on the element member is provided in an outer container housing the cathode of the electron gun, the grid, and the supporting member of the element member. Since the phosphor is configured to be installed, the surface of the phosphor can be coated with a thin aluminum film before measuring the luminance, which increases luminous efficiency and suppresses quality deterioration of the phosphor. In addition, it is possible to economically and quickly measure the luminance of the phosphor by electron beam irradiation continuously within the same outer container.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a luminance measuring device for a phosphor for a light emitting device according to an embodiment of the invention of the first claim, and FIG. 2 is a diagram showing another embodiment of the luminance measuring device for a phosphor for a light emitting device. A configuration diagram showing an example, FIG. 3 is a configuration diagram showing a luminance measuring device for a phosphor for a light emitting device according to the invention of claim 2, and FIG. 4 is an exploded perspective view showing a light emitting device according to the present invention and a conventional one. , FIG. 5 is a perspective view showing the assembled state of the light emitting device in FIG. 4, FIG. 6 is an explanatory diagram showing control electrodes and wiring in the light emitting device, and FIG. 7 is a timing chart showing signals applied to each electrode. Figure 8 is an explanatory diagram showing the correspondence between the pixel arrangement and the electrodes, Figure 9 is an operation explanatory diagram showing the potential of each electrode and the flow of electrons, and 10rM is a light emitting element showing the arrangement of the light emitting elements. FIG. 1a is a display member, 9 is a phosphor, 31 is an outer container, 33 is a cathode, 34 is a grid, 36 is a luminance meter, 38.38A is a support member, 41 is a boat, and 42 is a vapor-deposited metal. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. 100 Display element 38 Support member 2 Figure 38

Claims (2)

[Claims] (1) an outer container that can be evacuated and has a cathode of an electron gun therein; a grid provided within the outer container to control the amount of electron irradiation from the cathode; and a grid provided within the outer container,
A fluorescent device for a light emitting device, comprising: a support member that supports a display member having a phosphor that emits light when irradiated with electrons; and a luminance meter that is provided outside the outer container and measures the luminance of the phosphor. Body brightness measuring device. (2) an outer container that can be evacuated and has a cathode of an electron gun therein; a grid provided within the outer container for controlling the amount of electron irradiation from the cathode; and a grid provided within the outer container,
a support member that rotatably supports a display member having a phosphor that emits light when irradiated with electrons; a luminance meter that is provided outside the outer container and measures the luminance of the phosphor; A device for measuring the luminance of a phosphor for a light emitting element, comprising: a vapor-deposited metal boat placed in a container and heated to vapor-deposit a metal thin film on the display member.