JPS62172641A - Flat matrix crt - Google Patents

Abstract

PURPOSE:To make it possible to adjust the color mixing function, by subdividing the areas of luminous bodies responding to the visual property as well as composing the phosphors with red, blue, and green luminous bodies, when the phosphor is formed into plural matrix forms on a face plate where thermions from a filament are spattered while being controlled to generate a desired luminous radiation. CONSTITUTION:While subdividing phosphors 2, which are divided into red, blue, and green, to intensify the color element density, it is arranged in order on a face plate 1 composing a flat matrix CRT. Then, at the rear side of the face plate 1, a spacer is fixed to produce a vacuum space, thermions from a filament furnished therein are spattered on the phosphors 2, while being controlled by a grid, and made to emit them in order as a luminous radiation. In such a composition, the area ratioes of the red, blue, and green are fixed at 30:10:60 tentatively, and furthermore, the area ratioes are regulated minutely by adding the luminous efficiency, to correct the unevenness of the luminous property.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flat matrix CRT forming a display screen of a large-sized image display device.

[Conventional technology]

To briefly explain this type of conventional device, a flat matrix CRT generally has a rectangular face plate on which a phosphor is deposited as a display pixel, and the display portion is a rectangular face plate.
A spacer glass conforming to the shape of the face plate is welded to the back side of the face plate, and a bottom plate glass is further welded to the back side of the spacer glass to form a vacuum inside.

Inside this vacuum, there is a filament that becomes a cathode electrode that generates thermoelectrons, and an X grid and a Y grid that accelerate the generated thermoelectrons and collide with the phosphor of the faceplate to emit predetermined information. It is placed towards the side. These filaments and
, a low voltage is applied to the Y grid via a low voltage pin and a lead wire connected to it to generate hot electrons in the filament, and by selectively applying each of the X grid and Y grid, a predetermined voltage is applied. Thermionic electrons are made to collide only with the phosphor. A shielding plate is attached to the back side of each phosphor so that thermoelectrons directed toward the phosphor are not diffused to other adjacent phosphors. Therefore, a phosphor that is not bombarded by thermoelectrons does not emit fluorescence, and a flat matrix CRT displays fluorescence with good contrast. At this time, a high voltage is applied to each of the phosphors on the face plate using each as an anode electrode, so that the phosphors always emit a predetermined color due to the collision of thermoelectrons. In addition, the X grid indicates ON and OF of thermionic electrons.
F control is performed, and the Y grid plays the role of an electron lens.

[Problem that the invention seeks to solve]

The flat matrix CRT having the above configuration has four colors, red (R), blue (B), and two green (G) as the reference units for color display as phosphors forming display pixels. Various colors are displayed by mixing the colors of light emitted from these phosphors. The phosphor for each luminescent color is prepared by mixing multiple phosphors to obtain a predetermined color tone.For example, in the case of green, multiple phosphors that emit green light with the optimum wavelength for the predetermined display color are mixed together. In each case, the wavelength characteristics of the device were tested to confirm whether or not it emitted light of a predetermined wavelength. Therefore, if the tone of the display color changes, a plurality of fluorescent substances must be mixed accordingly, and the production line must be stopped each time.

This invention was made in order to solve the above-mentioned problems, and by focusing on the human visual characteristics with respect to red (R), blue (B), and green (G) colored lights, the above-mentioned desired fluorescence The object of this invention is to make it possible to easily change the color of the body and to obtain a flat matrix CRT without stopping the production line as in the past.

[Means for solving problems]

Red color in the flat matrix CRT according to this invention (
R), blue (B), and green (G) phosphors are subdivided so that the area ratio matches the visual characteristics of each color.

[Effect]

According to this invention, since the phosphor is subdivided into area ratios according to the visual characteristics of each color, a plurality of phosphors for red (R), blue (B), and green (G) prepared in advance according to predetermined color tones can be used. By simply depositing different types of fluorescent substances in accordance with the predetermined area ratio,
It is possible to obtain a Fuller and Tomatotrix CRT that exhibits a good color mixing effect in accordance with the demands of consumers, and it is also easy to change the fluorescent materials.

〔Example〕

The present invention will be explained below based on the embodiments shown in FIGS. 1 and 2. In FIG. 1, (a) is a front view of a flat matrix CRT, (b) is an enlarged view of its main parts, and FIG. 2 is equivalent to FIG. 1 (a) showing another embodiment of the present invention. It is a diagram.

A face plate (1) constituting a flat matrix CRT is coated with phosphors (2) in a matrix, as in the conventional case, as shown in FIG. 1(a). According to this embodiment, each phosphor (2) is further subdivided into three vertical columns to form a display pattern with increased pixel density. Each of the three divided phosphors (2) is red (R)
, blue (B), green CG), and each color emits light with an ideal wavelength, then red (R)
, blue (B).

Each area ratio is 3 depending on the human visual characteristics for green (G).
Q: Formed at 10:130. However, in practice, the luminous efficiency of each color differs depending on the optical characteristics of each deposited phosphor material, so in order to compensate for the dispersion in the characteristics, the area ratio is finely adjusted by taking into account the luminous efficiency of each color. There is a need. A desired color tone can be easily obtained by finely adjusting the area ratio in this way to obtain a light emitting pattern of each phosphor (2) that matches the visual characteristics and making it easier to mix colors. Furthermore, an important effect obtained from such a configuration is that by simply changing the area ratio of the phosphors exhibiting each color according to the desired color tone, the user can obtain the phosphor material that exhibits multiple tones of the same color prepared in advance. Since it is extremely easy to switch and deposit depending on the fluorescent material, there is no need to mix and test multiple fluorescent materials each time the fluorescent material is changed, as in the past, and therefore the production line has to be stopped each time. This eliminates the need for flat matrix CRTs and increases the efficiency of mass production of flat matrix CRTs.

Although the arrangement of red (R), blue (B), and green (G) is not limited to this embodiment, the arrangement in this embodiment can provide the best color mixing effect. It goes without saying that consideration should also be given to the light transmission characteristics of the face glass on which the phosphor (2) is adhered.

According to another embodiment, each phosphor (2) is divided vertically and horizontally, and as shown in FIG. By adjusting the area of the gap formed, a new effect can be obtained in that the balance of one color tone can be controlled by changing the area to which the phosphor (2) is adhered.

〔Effect of the invention〕

According to this invention, the phosphor deposited in a matrix forming the face plate of a flat matrix CRT is subdivided into areas that match the visual characteristics of each color. The color mixing effect can be easily obtained by simply changing the color ratio, thereby eliminating the need to stop the production line and increasing the efficiency of mass production of flat matrix CRTs.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) show an embodiment of a flat matrix CRT according to the present invention, in which FIG. 1(a) is a front view, FIG. 1(b) is an enlarged view of the main part, and FIG. It is a figure which shows another Example of this invention. In the figure, (1) is the face plate. (2) is a phosphor. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1 (a) Procedural Amendment (Section 9.) Mr. Director-General of the Revision Agency N-1
, Indication of the case Japanese Patent Application No. 61-014082 2 Title of the invention Flat Matrix CRT 3 Amended person Representative Moriya Shiki 5 Subject of the amendment 6 Contents of the amendment (1) Scope of claims in the specification Amend the description as shown in the attached sheet. (2) “And,” on page 4, lines 9 to 18 of the specification,
...I was forced into it. '' has been amended as follows. "However, R color light depends on the emission brightness ratio of each phosphor, and it is necessary to mix the phosphors to obtain a predetermined brightness ratio, resulting in problems such as the brightness ratio varying from loft to loft. (3) On page 5, lines 2 to 4 of the specification, the description [switchable...flat matrix CRTJ] was replaced with "switchable flat matrix CRTJ".
Correct with J. (4) The statement "switching is easy" on page 5, lines 18 to 19 of the specification is amended to "no compounding required." (5) The statement "It is not necessary and can be improved" on page 7, lines 10 to 13 of the specification is amended to "It is no longer necessary." (6) The statement "Production line...can be done" on page 8, lines 13 to 15 of the specification is amended as follows. "There is no need to mix phosphors, and it is possible to produce flat matrix CRTs with a uniform color tone without variations in the luminous efficiency of phosphors from rod to rod." 7. Scope of patent claims after correction of the list of attached documents One or more documents stating the amended scope of claims (1) A plurality of phosphors are deposited in a matrix on the face plate,
A spacer is attached to the back side of this face plate along the outer peripheral edge shape of this face plate, and a bottom plate is further sealed on the back side of this spacer to form a vacuum space inside, and a filament arranged in this vacuum space is attached. In a flat matrix CRT in which thermionic electrons are controlled by a grid and directed toward the phosphors to display a predetermined luminescence, the phosphors are red, blue, and green light emitters, and each of the colors A flat matrix CRT characterized in that the area of the light emitter is subdivided to ensure luminance that matches visual characteristics. (2) The rat blood progression for the above red, blue, and green is 30:IO:θ
The flat matrix CRT according to claim 1, wherein the flat matrix CRT is O. (3) The flat matrix according to claim 1 or 2, characterized in that the phosphors are deposited in parallel in sequence as red, blue, and green light emitters.
S CRT. (4) The flat matrix CRT according to claim 3, wherein the area ratio is determined by taking into account the luminous efficiency of each of the red, blue, and green light emitters.

Claims (4)

[Claims] (1) A plurality of phosphors are deposited in a matrix on the face plate, and spacers are attached to the back side of the face plate along the outer periphery of the face plate.
Furthermore, a bottom plate is sealed on the back of this spacer to form a vacuum space inside, and thermoelectrons from a filament placed in this vacuum space are controlled by a grid and directed toward the phosphor to a predetermined value. In a flat matrix CRT that displays light emission, the phosphors are red, blue, and green light emitters, and the area of the light emitters is subdivided to ensure luminance that matches the visual characteristics of each color. Flat matrix CR characterized by
T. (2) The visual characteristics for the above red, blue, and green are 30:10:
60. The flat matrix CRT according to claim 1, wherein the flat matrix CRT is 60. (3) A flat matrix CRT according to claim 1 or 2, characterized in that the phosphors are sequentially deposited in parallel as red, blue, and green light emitters. (4) The flat matrix CRT according to claim 3, wherein the area ratio is determined by taking into account the luminous efficiency of each of the red, blue, and green light emitters.