JP2758512B2 - Light emitting element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device for constructing a large screen display device used in a stadium or the like.

[0002]

2. Description of the Related Art FIG. 2 is a perspective view and an exploded perspective view of a conventional light emitting device. Reference numeral 1a denotes a display section made of glass or the like, on which an anode (not shown) is provided, on which a plurality of phosphors 9 are applied. 1b is a spacer and 1c is a substrate (rear panel) made of glass or the like provided with various control electrodes. These 1a,
1b and 1c constitute the vacuum vessel 1 of the light emitting element. 2 is a linear cathode provided on the substrate 1c, 3 is a first control electrode (scanning electrode), and 4 is a second control electrode (data electrode). 5 and 6 are wiring patterns for commonly connecting the first and second control electrodes 3 and 4 in the row direction and the column direction, respectively. 7 is a shielding electrode having an opening 8 provided for each phosphor 9; Denotes an exhaust unit provided on the substrate 1c.

FIG. 3 is a side sectional view of a light emitting device, showing a positional relationship between a phosphor and an opening. The center of the phosphor and the center of the opening are the same perpendicular to both the center and the periphery.
On two. 8a is a peripheral opening, 8b is a central opening, 9a is a peripheral phosphor, and 9b is a central phosphor. 11a is the center of the flow of thermoelectrons in the peripheral portion, and 11b is the center of the flow of thermoelectrons in the central portion.

FIG. 4 shows the arrangement and wiring of the first and second control electrodes 3 and 4. S1 to S4 are lead portions of the first control electrode commonly connected in the column direction, and D1 to D4 are lead portions of the second control electrode 4 commonly connected in the row direction.

FIG. 5 shows the timing of signals applied to the lead portions S1 to S4 and D1 to D4 of the first and second control electrodes 3 and 4.

FIG. 6 illustrates the potentials of the first and second control electrodes 3 and 4 and the electron flow 11 in the following cases (1) to (4).

FIG. 7 shows drawers S1 to S4 and D1 to D4.
And the pixels (fluorescent substances) P11 to P44.

Next, the operation will be described. The basic principle of this type of display device is to accelerate the thermoelectrons emitted from the cathode and collide with the anode to excite the phosphor applied on the anode surface to emit light.

In FIG. 6, the thermoelectrons from the linear cathode 2 are generated as follows by the combination of the potentials of the first control electrode (hereinafter referred to as scanning electrode) 3 and the second control electrode (hereinafter referred to as data electrode) 4. To behave. Each of them will be described with reference to FIG.

When both the scanning electrode 3 and the data electrode 4 are positive with respect to the cathode potential

The thermoelectrons emitted from the linear cathode 2 by the positive potential of the data electrode 4 are deflected by the potential of the scanning electrode 3, pass through a predetermined opening 8, reach the anode of the display unit 1 a, and pass through the phosphor 9. Make it emit light.

When the scanning electrode 3 is positive and the data electrode 4 is negative

The potential near the linear cathode 2 becomes negative due to the negative potential of the data electrode 4 near the linear cathode 2, and emission of thermoelectrons is suppressed. Therefore, the phosphor 9 does not emit light.

When scanning electrode 3 is negative and data electrode 4 is positive

There are the following two cases.

(A) When the other scanning electrode 3 is positive

The thermoelectrons emitted from the linear cathode 2 are deflected toward the other scanning electrode 3 by the potential of the scanning electrode 3,
The phosphor does not emit light.

(B) When the other scanning electrode is also negative

Although the potential of the data electrode 4 is positive, since the area of the data electrode 4 is small, the potential in the vicinity of the linear cathode 2 becomes negative due to the negative potential of the scanning electrodes 3 on both sides, and the thermoelectrons become negative. The emission is suppressed, and the phosphor 9 does not emit light.

When both the scanning electrode 3 and the data electrode 4 are negative

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

As a result, due to the relationship between the wiring shown in FIG. 4 and the arrangement of the pixels (phosphors) P11 to P44 shown in FIG. 7, it is located at the intersection of the scanning electrode 3 and the data electrode 4 to which a positive potential is applied. The phosphor 9 emits light. Drawer S
When a signal is applied to 1, the pixels P11 to P14 are selected, and these emit light in accordance with the potentials of the lead portions D1 to D4 of the data electrode 4. Next, when a signal is applied to the extraction portion S2, the pixels P21 to P24 are selected, and the phosphor 9 emits light in accordance with the potential of the data electrode 4. According to the above, as shown in FIG. 4, by sequentially applying a scanning signal to the scanning electrode 3 and applying an arbitrary data signal to the data electrode 4, an arbitrary pixel display can be obtained.

[0023]

Since the positional relationship between the phosphor 9 and the opening 8 of the conventional light emitting element is configured as shown in FIG. 3, the peripheral portion is affected by the potential effect due to the charge-up of the spacer 1b. The flow of the thermoelectrons may be deflected to the outside of the vacuum vessel 1, and the center 11a of the flow of the thermoelectrons may not collide with the center of the phosphor 9, and the emission luminance of the peripheral phosphor 9a and the central phosphor 9b may be reduced. However, there were problems such as differences.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to obtain a light-emitting element capable of causing the center of the flow of thermoelectrons to collide with the center of a peripheral phosphor. I do.

[0025]

According to the present invention, there is provided a light emitting device comprising a plurality of openings provided in a shielding electrode for each phosphor.
Of which, the opening around the vacuum vessel is the spacer wall of the vacuum vessel.
The space from the vacuum vessel to the dimension from the surface to the phosphor center
The size from the wall surface to the center of the opening is enlarged .

[0026]

In the light emitting device according to the present invention, the center of the flow of thermoelectrons collides with the center of the phosphor even in the peripheral portion.
The light emission luminance of the phosphors in the central part and the peripheral part becomes uniform.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the same parts as those in FIG.

In FIG. 1, reference numeral 13 denotes a peripheral opening 8a.
Of the center of the phosphor 9a in the peripheral portion is shifted inside the vacuum vessel 1 by a deflection distance d.

Next, the operation will be described.

The thermoelectrons emitted from the linear cathode 2 by the positive potential of the data electrode 4 are deflected by the potential of the scanning electrode 3 and pass through predetermined openings 8a and 8b. The thermoelectrons passing through the peripheral opening 8a are deflected to the outside of the vacuum vessel 1 and collide with the phosphor 9a by the influence of the potential due to the charge-up of the spacer 1b. The perpendicular 13 at the center of 8a is displaced inside the vacuum vessel 1 with respect to the perpendicular 12 at the center of the phosphor 9a. Therefore, the center 11a of the flow of thermoelectrons in the peripheral portion can collide with the center of the phosphor 9a. The thermoelectrons passing through the central opening 8b collide with the phosphor 9b without being affected by the potential due to the charge-up of the spacer 1b, so that the centers of the phosphor 9b and the opening 8b are on the same perpendicular line 12. is there.

[0031]

As described above, according to the present invention , the shielding
Of the multiple openings provided in the electrode for each phosphor,
Open the opening around the empty container from the wall of the spacer of the vacuum container.
Is it the space wall of the vacuum vessel for the dimension up to the center of the light body?
Since the size from the center to the opening is increased , the center of the thermoelectron flow can collide with the center of the phosphor as well as the center of the thermoelectron. The effect that the light emission luminance of the fluorescent material in the part and the peripheral part becomes uniform can be obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a light emitting device according to an embodiment of the present invention.

FIG. 2 is a perspective view and an exploded perspective view of a conventional light emitting device.

FIG. 3 is a side sectional view of a conventional light emitting device.

FIG. 4 is a configuration diagram showing the arrangement and wiring of two types of control electrodes.

FIG. 5 is a time chart showing timings of signals applied to respective electrodes.

FIG. 6 is an explanatory diagram showing the relationship between the potential of each electrode and the flow of electrons.

FIG. 7 is a configuration diagram illustrating a correspondence relationship between an array of pixels and electrodes.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vacuum container 1b Spacer 2 Linear cathode 3, 3a, 3b First control electrode (scanning electrode) 4, 4a, 4b Second control electrode (data electrode) 7 Shielding electrode 8, 8a, 8b Opening 9, 9a , 9b phosphor 11, 11a, 11b center of the flow of thermionic electrons 12 perpendicular to the center of the phosphor 13 perpendicular to the center of the opening

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shuji Iwata 8-1-1, Tsukaguchi-Honmachi, Amagasaki City Mitsubishi Electric Corporation, Industrial Systems Research Laboratories (72) Inventor Kazunori Tatsuta 700 Wada, Uenocho, Ise-shi, Mie Prefecture Inside Ise Electronics Industry Co., Ltd. (72) Koji Seko, 700, Wada, Ueno-cho, Ise, Mie Prefecture Inside (72) Yuji Kamogawa 700, Wada, Ueno-cho, Ise, Mie, Ise Electronics Industry Co., Ltd. (56) References JP-A-1-253147 (JP, A) JP-A-1-253150 (JP, A)

Claims (1)

(57) [Claims] 1. An anode in which a plurality of phosphors are arranged in a matrix in a vacuum vessel, a linear cathode provided corresponding to the phosphor at a position facing the anode, and a phosphor of the anode. A plurality of openings provided for each of the vacuum containers, and the center of the opening of the vacuum container is perpendicular to the center of the phosphor.
And the opening around the vacuum vessel is
From the spacer wall of the vacuum vessel to the center of the phosphor
For the dimensions, from the spacer wall surface to the center of the opening
A light-emitting element comprising: a shielding electrode having a larger size; and a control electrode for controlling a flow of thermoelectrons emitted from the linear cathode.