JPH031431A - Cathode-ray display panel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to cathode rays used for displaying multi-digit characters and numbers such as terminals for displaying figures and characters in computers and message boards. This invention relates to improvements to display panels.

(Prior Art) Recently, a stacked fluorescent display panel has been proposed that can be driven at low voltage even when the number of pixels increases and has a large screen (Japanese Patent Application No. 111,633/1983). This fluorescent display panel consists of an anode substrate in which a fluorescent layer is provided on a transparent insulating substrate such as glass through an anode, and a spacer substrate having a large number of through holes or slits is placed on the anode substrate. The laminated body of these substrates is separated from the laminated control electrode group and cathode, and the back substrate laminated on the cathode and having a conductive Q film formed on the inner surface. Coated with a sealing material such as
They are integrated by hot pressing at a temperature of ~450°C, and the inside is evacuated to form a cathode ray display panel.

In this fluorescent display panel, the cathode is made in the form of a filament or a thin film, and the electron generating part is always 600~
It is electrically heated to 700°C. On the other hand, the control electrode group is
It consists of a scanning electrode and a data electrode, which are arranged orthogonally to each other, and are arranged close to the cathode section. This control electrode group has mesh-like or through-hole-like openings at the intersections of the electrodes in order to pass or block electrons emitted from the cathode, and the potential of each electrode is applied while controlling it line-sequentially. By doing so, the light-emitting state and non-light-emitting state of the fluorescent layer on the anode are controlled. The voltage applied to control electrons in this way varies depending on the shape of the cathode part and the control electrode part, and the positional relationship between the cathode part, control electrode part, and anode, but in order for the electrons to pass, a positive voltage is required. Alternatively, a low negative voltage is applied, a negative voltage is applied to block electrons, and a voltage with an intermediate value between these is applied to display a medium r#It gray scale.

Furthermore, the present applicant has recently proposed providing an extraction electrode directly below the control electrode in order to efficiently extract electrons from the cathode through a group of control electrodes driven at a negative potential. This extraction electrode has a hole with the same pattern as the hole for electron passage in the control electrode, and when a positive bias voltage is applied, this potential forms a positive equipotential surface that reaches the cathode from the hole in the control electrode group. It has the function of efficiently passing through the holes in the control electrode group and drawing out the electrons emitted from the cathode.

(Problem to be Solved by the Invention) However, since the fluorescent display panel of the prior art operates based on the principle of cathodoluminescence without memory, the number of drives corresponding to the electrode leads of each of the scan electrode and data electrode is Therefore, there is a drawback that the number of driving LSIs increases in proportion to the increase in display capacity.

In addition, in a cathode ray display panel having an extraction electrode, the positive potential applied to the extraction electrode absorbs electrons and becomes a grid current that is ineffective for light emission, so the voltage of this extraction electrode is often low; It is better if the thickness is small.However, if the extraction electrode is made thin, when a striped control electrode is formed on it through an insulating film, the stress generated during film formation will deform the extraction electrode substrate, and This poses a drawback in that photoetching and mask alignment operations that are carried out are seriously hindered, film formation conditions become stricter, and workability becomes lower.

An object of the present invention is to avoid the above-mentioned drawbacks, and to increase display capacity without increasing the number of driving LSIs.
Another object of the present invention is to provide a cathode ray display panel that can reduce power consumption.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an anode substrate having a fluorescent layer provided through an anode, and first and second fluorescent layers provided on the anode substrate. 2. A cathode ray display panel comprising a control electrode group including a control electrode and an extraction electrode, and a cathode, characterized in that the cathode selection electrode is provided near the cathode and controls thermoelectrons emitted from the cathode. (Operation) In this way, by providing a cathode selection electrode near the cathode, the potential of the cathode corresponding to the addressed pixel and the non-addressed pixel can be controlled separately. There is no need to separate control electrode leads for each pixel, and therefore the drive LSI
can reduce the number of

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cathode ray display panel 10 according to the present invention, and this cathode ray display panel 1o is made of a material such as soda lime. An anode 1 is placed on a transparent insulating substrate 12 such as a glass substrate.
an anode substrate 18 having a fluorescent layer 16 provided through 4;
, a control electrode group 22 provided on this anode substrate 18 via a spacer substrate 2°, a cathode 24 provided on this control electrode group 22, and a control electrode arranged on this cathode 24. It consists of a back substrate 26 provided to the group 22 via a spacer substrate 22°.

The anode 14 is formed by depositing SnO or ITO (In20s-5n02) on the glass transparent insulating substrate 12 using a thin film technique such as sputtering, spraying, or CVD.
) is formed by depositing a transparent conductive film with a thickness of 2.0 to 3000 mm in a predetermined electrode pattern.

The control electrode group 22 includes two control electrodes, a first and a second, which have through holes 28a and 28b, respectively, to pass and block electrons emitted from the cathode 24, and intersect with each other in the X and Y directions. (Scanning electrode and data electrode) Films are formed from 28A and 28B.

Further, this control electrode group 24 includes an extraction electrode 30 that is integrally provided directly below the second control electrode 28B and to which a positive bias potential is applied, and this extraction electrode 30 is connected to the through holes 28a of the control electrodes 28A and 28B. , 28b. An insulating film 27.
29 are provided respectively. This control electrode group 22 is formed by A thin film technology such as sputtering, plasma CVD, or sol-gel method on a metal thin plate of 426 alloy.
It is formed by depositing an insulating material such as I, O, 5iot, or a thin film of metal such as nickel or aluminum. In the illustrated embodiment, the extraction electrode 30 is provided with a recess 31 so as to be thinner only near the through hole 30a, so as to reduce the thickness of the lead electrode 30, which is ineffective for light emission.
In addition, the thick portion other than the through hole 30a allows a striped control electrode 2 to be formed on the thick portion through an insulating film.
When forming 8B, the extraction electrode 30 is deformed by the stress generated during the film formation, so that the subsequent photoetching and mask alignment operations can be performed without major hindrance. FIG. 4 shows a method of forming such an extraction electrode 30 in the order of steps, in which the thickness of the extraction electrode substrate 30A is approximately 0.3 to 0.5 mm, and the portion on which the recess 31 is provided (see FIG. A resist 36 is applied to both surfaces except for the portion where the through hole 30a is to be provided (see FIG. 4B), and the recess 31 and the through hole 30a are formed by chemical milling. According to this method, the through hole 30a can be formed after forming the recess 31 for etching in two stages, and the depth of the recess 31 can be set arbitrarily by changing the etching conditions of the first stage. In addition, since the electrode substrate is thick as a whole and the area of the thin plate can be reduced, deformation of the substrate will not occur.
In addition to forming the control electrode after forming the control electrode, the extraction electrode may be formed by etching after forming an electrode film on the extraction electrode substrate with an insulating film interposed therebetween.

Although not shown in detail, the cathode 24 is formed by spot welding a thin filament onto the cathode substrate via a retaining portion, or by depositing a thin metal film by vapor deposition or sputtering.

In FIG. 1, reference numeral 32 is a conductive thin film provided on the inner surface of the back substrate 28.

As shown in FIGS. 1 and 2, the cathode ray display panel 10 of the present invention includes a cathode selection electrode 34 provided near the cathode 24 to selectively control the cathode 24. As shown in FIG. 2, this cathode selection electrode 34 has a 1w1 pole 24. (the fluorescent layers 16□, 16 in FIG.
□, 16. , this cathode 24 . A cathode selective electrode 34 corresponding to the cathode selection electrode 34. is this cathode 24. the cathode 24. so that electrons from the cathode 24. is applied to a potential equal to that of the unaddressed pixel cell (phosphor layer 16□8.16.□ in FIG.
A positive equipotential surface from the extraction electrode 30 in which the cathode selection electrode 342 corresponding to the pixel unit containing 16.3 has a sufficiently negative selected potential and is biased to a positive potential. The cathode 24 is controlled to prevent the

Next, the operation of the cathode ray display panel of the present invention will be described.
In the pixel cell, a corresponding first control electrode (scanning electrode)
28A11, 28A1□, 28A13, the potential of the control electrode is applied as a negative potential that can cancel out the positive potential applied to the extraction electrode 30, and is always applied when the pixel is not addressed. is applied so that the potential of the control electrode is equal to the potential of the cathode,
Negative and zero potentials are appropriately applied to the second control electrode 28B according to the timing to display an arbitrary image pattern.
Next, an adjacent second pixel cell is selected, the first control electrode is scanned in the same manner as the first pixel cell, and a signal voltage is applied to the second control electrode 28B accordingly.

FIG. 3 shows the connection state of the control electrodes 28A and 28B, and the pixel cell has a cathode selection electrode 34 disposed near the cathode 24.
For example, the first control electrode 2
8 A, t and 28 A,.

and 28A31.28 A l* and 28A□ and 28 A
zff.

28A+3, 28At3, and 28A0 can be commonly connected. Therefore, the fluorescent layer 16. To address I, an on-potential is applied to the corresponding cathode selection electrode 34, and an on-potential is applied to the control electrodes 28A, I, 288■.

Therefore, 1. For example, if there are 4 pixel cells and each pixel cell has 3 pixels, 12 leads were required in the past, but in the present invention, 7 leads are required. Therefore, the number of driving LSIs It turns out that less is better.

Furthermore, the cathode selection electrode 34 effectively reflects infrared rays emitted from the cathode 24 toward the cathode 24 by the metal reflection function of the cathode selection electrode 34, so that the power consumption of the cathode 24 can be greatly reduced.

In the above embodiment, one cathode is provided in one pixel cell, but a large number of cathodes may be provided in one pixel cell. Although the present invention is applied to a display panel, the present invention can also be applied to a cathode ray tube type cathode ray display panel in which one cathode corresponds to a large number of control electrodes.

(Effects of the Invention) According to the present invention, as described above, since the potential of the cathode is controlled by the cathode selection electrode arranged near the cathode, the connection state of the control electrode is simplified, and the drive connected to the control electrode is L
The cathode ray display panel can be manufactured economically because the number of SIs can be reduced, and the power consumption can be reduced due to the infrared reflection effect of the cathode selection electrode, which is a practical benefit that can be used economically. There is.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a cathode ray display panel of the present invention, FIG. 2 is an enlarged cross-sectional view showing the operating state of the panel of the present invention, FIG. ) to (C
) are sectional views sequentially showing the manufacturing process of the extraction electrode used in the present invention. 1o---One cathode ray display panel, 12---m-Transparent insulating substrate, 14---One anode, 16---Fluorescent layer, 1B---m-Anode substrate, 22--- -1 control electrode group, 24---- cathode, 30-1---extracting electrode,
34--One cathode selective electrode. Figure 1 Figure 2

Claims (1)

[Claims] In a cathode ray display panel comprising an anode substrate having a fluorescent layer provided through an anode, a control electrode group including first and second control electrodes and an extraction electrode provided on the anode substrate, and a cathode. . A cathode ray display panel comprising a cathode selection electrode provided near the cathode and controlling thermoelectrons emitted from the cathode.