JPH01189842A - Image display device - Google Patents

Abstract

PURPOSE:To obtain a display device with high intensity by applying the higher voltage to the side of passing holes to pass emitted electrons than to the periphery and accelerating the focusing of the emitted electrons to the passing hole//s by the mutual cooperation of control electrodes applied with the different voltage. CONSTITUTION:The voltage applied to an X control electrode 9a and a Y control electrode 9b is set to 10V, the voltage applied to an X control electrode 9c is set to 5V. In this case, the X control electrode 9a generates the luminous state for phosphor 2, the X control electrode 9c generates the nonluminous state. The electric field distribution at this time is inclined centering the X control electrode 9c, the electric field distribution E is inclined near passing holes 10, electrons (e) emitted from a filament 6 can pass the passing holes 10, the electron density of the passing holes 10 is remarkably improved, the intensity of phosphor 2 can be increased. When the voltage applied to the X control electrodes 9a and 9c is variously adjusted, the inclination state of the electric field of the electric field distribution E is changed, the electron density at the passing holes 10 can be changed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a CaT type image display device.

[Conventional technology]

FIG. 3 is a vertical sectional view showing a conventional image display device disclosed in, for example, Japanese Patent Application No. 61-31135, and FIG. 4 is an exploded perspective view thereof. In the figure, 1 is a face plate, 2 is a plurality of phosphors arranged in a square shape on the inner surface of the face plate 1, and 3 is a surface of the phosphor 2 that covers the surface of the phosphor 2. When an anode potential (about 10 KV) is applied, A metal back (aluminum vapor deposited film) that functions as an application electrode, 4a is an X control electrode as a first control electrode, 4
b is an X control electrode as a second control electrode, 5 is a passage hole provided with the X control electrode 4a and the X control electrode 4bK, and 6
is a filament, γ is a glass space that supports the control electrode 4 and filament 6, and 8 is a glass container. And these face plates 1. The glass space 7 and the glass container 8 form a vacuum container sealed in a vacuum.

Next, the operation will be explained. It is assumed that, for example, a voltage of Ov to IOV is applied to each of the X control electrode 4a and the X control electrode 4b, and a predetermined voltage is also applied to each filament 6.

As shown in FIG. 5, the emitted electrons e from the filament 6 are transferred to the X and X control electrodes 4a and 4b, where an electric field distribution (the potential increases as it approaches the X and X control electrodes 4a and 4b) is formed. and the filament 6 in the direction of the arrow. The emitted electrons e that have passed through the passage hole 5 are irradiated through the metal puncture 3, so that red (R),
A specific phosphor 2 such as f (B) or green (G) is displayed by emitting light.

At this time, in the passage hole 5, the X and X control electrodes 4a,
On/off control is performed by voltage control of the phosphor 4b, and by adjusting the pulse width of this applied voltage, that is, the application time width, the emitted electrons e of the phosphor 2 are controlled. As a result, the brightness of the phosphor 2 is controlled.

[Problem to be solved by the invention]

Since the conventional image display device is constructed as described above, the emitted electrons e from the filament 6 travel straight toward the X and X control electrodes 4a and 4b, and the amount of emitted electrons passing through the passage hole 5 is equal to that of the passing electrons. Because it is determined by the area,
There have been problems in that the amount of emitted electrons e emitted from the phosphor 2 cannot be increased beyond a certain level, and sufficient brightness may not always be obtained.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an image display device that can improve the amount of electrons emitted from the phosphor with a simple configuration.

[Failure to solve the problem]

In the image display device according to the present invention, the first control electrode is configured with a high-voltage electrode part and a low-voltage electrode part, and the high-voltage electrode part faces the passage hole through which the emitted electrons should pass. The high-voltage electrode section and the low-voltage electrode section cooperate to promote focusing of emitted electrons on the passage hole.

[For production]

The high-voltage electrode part and the low-voltage electrode part in this invention form an electric field gradient in the electric field distribution around the passage hole so that the emitted electrons are focused around the passage hole, so that the emitted electrons traveling near the passage hole are Much of it is focused towards the passage hole,
The density of emitted electrons passing through the passage hole becomes large.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 9a and 9c represent X as the first control electrode.
A high voltage electrode part and a low voltage electrode part forming a control electrode, 9b is an X control electrode as a second control electrode, 10 is an emitted electron e
It is a passage hole through which the Then, the high voltage electrode section 9
A controls the phosphor 2 to be in a light-emitting state when a predetermined voltage is applied, and the low-voltage electrode section 9C controls the phosphor 2 to be in a non-light-emitting state when a predetermined voltage is applied. It is controlled as follows.

Next, the operation will be explained. For example, now the high voltage electrode section 9
The voltage applied to the a and X control electrodes 9b is 10V, and the voltage applied to the low voltage electrode section 9C is 5V.

In this case, as described above, the high voltage electrode portion 9
a produces a light emitting state, and the low voltage electrode section 9C produces a non-light emitting state.

The electric field distribution at this time is as shown in Figure 2.
The electric field becomes inclined around the high-voltage electrode portion 9a, and the electric field distribution E near the passage hole 10 becomes inclined as shown.

Therefore, among the emitted electrons e emitted from the filament 6, those that could not pass through the passage hole 5 in FIG. 5 are focused toward the passage hole 10 in FIG. be able to pass through. Therefore, the electron density in the passage hole 10 due to the emitted electrons e can be significantly improved, and the brightness of the phosphor 2 can be increased.

By variously adjusting the voltage values applied to the high-voltage electrode section 9a and the low-voltage electrode section 9C, the gradient state of the electric field of the electric field distribution E can be changed, and the electron density in the passage hole 10 can be changed. Alternatively, the voltage values of the high-voltage electrode section 9a and the low-voltage electrode section 9C can be fixed, and the control voltage value on the X control electrode 9b side can be adjusted.

In the above embodiment, the X control electrode, that is, the first control electrode is formed by one high-voltage electrode section 9a and one low-voltage electrode section 9C, respectively.
Although a configuration shown in FIG. 1 is shown, if these are further divided and the first control electrode is configured with a plurality of high-voltage electrode sections and a plurality of low-voltage electrode sections, more accurate control can be performed.

〔Effect of the invention〕

As described above, according to the present invention, the first control electrode is composed of a high-voltage electrode part and a low-voltage electrode part, and the high-voltage electrode part is made to face the passage hole through which the emitted electrons should pass.
The high-voltage electrode part and the low-voltage electrode part work together to promote the convergence of emitted electrons to the passage hole, so the amount of emitted electrons emitted to the phosphor can be increased, compared to conventional This has the advantage that it is possible to realize an image display device with even higher brightness.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an image display device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram for explaining its operation,
FIG. 3 is a vertical sectional view showing a conventional image display device, FIG. 4 is an exploded perspective view showing its constituent members, and FIG. 5 is an explanatory diagram for explaining the operation of the device shown in FIG. 1 is a face plate, 2 is a phosphor, 6 is a filament, 9a is a high voltage electrode part (first control electrode), 9b is an X control electrode (second control electrode), 9C is a low voltage electrode part (first control electrode). ), 10 is a passage hole. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent Applicant: Mitsubishi Electric Co., Ltd. Figure 1 Figure 2 Procedural Amendment (Voluntary) 63.7.27 Showa Year Month Date

Claims (1)

[Claims] a plurality of phosphors arranged in a matrix on the inner surface of the face plate and emitting light when irradiated with electrons emitted from the filament; and a first control electrode arranged in a matrix between the phosphors and the filament; A second control electrode arranged in a matrix in a direction orthogonal to the first control electrode between the phosphor and the first control electrode, and the first and second control electrodes. formed by
In an image display device comprising a plurality of passage holes that control the amount of emitted electrons to the phosphor by controlling on/off the first and second control electrodes, the first control The electrode includes a high-voltage electrode portion facing the passage hole through which the emitted electrons pass, and is disposed adjacent to the high-voltage electrode portion, and cooperates with the high-voltage electrode portion to focus the emitted electrons on the passage hole. An image display device characterized by having a low voltage electrode section for promoting the image display.