JPH10269974A - Fluorescent character display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optionally switch a negative display and positive display. SOLUTION: An envelope 2 consists of a front substrate 5 and a back substrate 3. A first anode 8 formed by covering a light transmitting segmental first anode conductor with a ZnO:Zn phosphor is arranged on the inner surface of the front substrate 5. A second anode 14 in which a ZnO:Zn phosphor emits light all over so as to surround the first anode 8 as viewed from the observing direction is formed on the inner surface of the back substrate 3. The first electrode 8 is put on and at the same time a second phosphor layer 13 is put out. In the non-luminous background, positive display by the first anode 8 is performed. A part where display by the first anode 8 is not intended is put on and a part where display by the first anode 8 is intended is put out, and the second electrode 14 is put on all over. Negative display surrounded in blue luminescence of the background and seen black is performed in the non-luminous part where display by the first anode 8 is intended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display device capable of switching a predetermined display pattern between negative display and positive display.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional general fluorescent display device 10.
FIG. 2 is a cross-sectional view schematically showing a structure of No. 0. The box-shaped envelope 101 includes an insulating anode substrate 102 and a side plate 103.
And a light-transmitting front plate 104 facing the anode substrate 102. On the inner surface of the anode substrate 102, an anode conductor 105 is formed in a predetermined pattern. A phosphor layer 106 is provided on the anode conductor 105. Inside the envelope 101, the control electrode 10 is provided above the phosphor layer 106.
7, and a filament-shaped cathode 108 as an electron source is stretched above the control electrode 107. The inside of the envelope 101 is maintained in a high vacuum state. Cathode 10
8 and an appropriate potential with respect to the cathode 108 is applied to the control electrode 107 and the anode conductor 105, the electrons emitted from the cathode 108 are accelerated and controlled by the control electrode 107, and the phosphor layer of the anode conductor 105 It strikes 106 and emits light. Light emission of the phosphor layer 106 is observed as a predetermined pattern through the front plate 104. For example, the shape of the anode conductor 105 is “FUT” as shown in FIG.
In the case of the segment pattern of the character "ABA" and the character of the date, the segment portion of this shape is observed as a positive display emitting light. In FIG. 6, a white portion in the segment is a non-light-emitting portion, and a black portion is a light-emitting portion.

[0003]

In the conventional fluorescent display device having the above-described structure, a positive display in which a specific segment shape is emitted can be performed. However, this is reversed to turn off the segment portion. It was not possible to switch to a negative display in which a portion other than the segment surrounding the segment was made to emit light. Even in the case of displaying the same segment shape, negative display having a larger actual light emission area than positive display is often preferred in terms of appearance depending on the use and purpose. In recent years, a fluorescent display device has been required to have high functionality capable of arbitrarily switching between negative display and positive display.

[0004] It is an object of the present invention to provide a fluorescent display device having a high display capability and a function capable of arbitrarily switching between negative display and positive display.

[0005]

According to a first aspect of the present invention, there is provided a fluorescent display device comprising: an envelope having a front substrate and a rear substrate arranged at a predetermined interval; and an inner surface of the front substrate. A segmented first anode conductor having translucency;
A first phosphor layer attached to the first anode conductor and an inner surface of the back substrate are formed to cover a predetermined region surrounding the first phosphor layer as viewed from the front side of the front substrate. Second
An anode conductor and the second anode conductor are attached to the predetermined area surrounding the first phosphor layer when viewed from the front side of the front substrate, and emit light in substantially the same color as the first phosphor layer. And a second phosphor layer.

According to a second aspect of the present invention, there is provided the fluorescent display device according to the first aspect, wherein a positive display for turning on the first phosphor layer and turning off the second phosphor layer is provided. The negative display for turning off the phosphor layer and turning on the second phosphor layer can be arbitrarily selected.

According to a third aspect of the present invention, in the fluorescent display device according to the first aspect, the first phosphor layer and the second phosphor layer emit light simultaneously and the second phosphor layer. It is characterized in that the light emission luminance of the pixel can be controlled in gradation.

According to a fourth aspect of the present invention, in the fluorescent display device according to the first aspect, the second phosphor layer emits light of substantially the same color as the first phosphor layer. And a phosphor that emits light of a different color. The plurality of phosphors are arranged in a pattern such that the entire predetermined area emits light only in the color.

According to a fifth aspect of the present invention, in the fluorescent display device according to the fourth aspect, the second anode conductor is composed of a plurality of striped anode conductors divided into a plurality of sets. Each of the phosphors of the phosphor layer is applied to each of the sets of the striped anode conductors.

According to a sixth aspect of the present invention, in the fluorescent display device according to the fourth aspect, the second anode conductor includes a plurality of dot-shaped anode conductors divided into a plurality of sets. Each phosphor of the phosphor layer is attached to each set of the dot-shaped anode conductors.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view schematically showing the structure of the fluorescent display device 1 of the present embodiment. The box-shaped envelope 2 includes an insulating rear substrate 3, a side plate 4, and a transparent and insulating front substrate 5 facing the rear substrate 3. A glass plate can be used as a material of the envelope 2. The rear substrate 3, the side plates 4, and the front substrate 5 are sealed with a glass sealing material, and the inside is evacuated to a high vacuum.

On the inner surface of the front substrate 5, a segmented first anode conductor 6 having a light transmitting property is formed. As shown in FIG. 2, the shape of the first anode conductor 6 of this example is “FUTA”.
It is a segment pattern of the character "BA" and the date. The first anode conductor 6 can be formed of a transparent conductive film such as ITO (Indium Tin Oxide). With aluminum mesh,
It is not completely transparent, and is not suitable because the peripheral portion appears to reflect external light. The wiring conductor connected to the first anode conductor 6 is also made of ITO.

A first phosphor layer 7 is adhered to the first anode conductor 6 to form a first anode 8. First of this example
The phosphor constituting the phosphor layer 7 is ZnO: Z which emits blue light.
n phosphor.

Inside the envelope 2, the first anode 8
The first control electrode 9 is provided below the first control electrode. The first control electrode 9 is directly fixed on the inner surface of the front substrate 5 with a sealing material such as frit glass. At the approximate center of the envelope 2 below the first control electrode 9, a filament-shaped cathode 10 as an electron source is stretched. Below the cathode 10,
A second control electrode 11 is provided. Second control electrode 11
Are directly fixed to the inner surface of the back substrate 3 with a sealing material such as frit glass.

A second anode conductor 12 is formed on the inner surface of the back substrate 3. The second anode conductor 12 covers a predetermined area on the inner surface of the rear substrate 3 so as to surround the first anode 8 when viewed from the front side of the front substrate 5 through the first anode 8. It is formed. As shown in FIG. 2, the segment-shaped display pattern of the first anode 8 is completely surrounded by a rectangular area (a) in the figure. On the inner surface of the back substrate 3, a second anode conductor 12 is formed in a region (a) corresponding to the rectangle. As shown in FIG. 4, the second anode conductor 12 is composed of a large number of thin striped anode conductors 12a and 12b divided into two systems. Two-system striped anode conductor 1
2a and 12b are nested with each other,
Driving voltages can be applied separately to each other. Unlike the first anode conductor 6, the second anode conductor 12
Need not be translucent, and of course, may be ITO, but can also be formed of an aluminum thin film.

The second anode conductor 12 has a second phosphor layer 1
3 are applied, and the second anode 14 is formed.
There are two types of phosphors constituting the second phosphor layer 13 of the present example: a ZnO: Zn phosphor that emits blue light, which is the same as the first anode 8, and a ZnCdS phosphor that emits red light. Both phosphors are
The two anode stripes 12a and 12b of the two systems constituting the second anode conductor 12 are separately attached to the respective stripe anode conductors 12a and 12b, and the second anode 14 as a whole is in a state where the phosphor is attached in a substantially solid shape. ing. Each of the phosphors is coated separately in a solution containing the phosphor by using a stripe-shaped anode conductor 12 of each system.
This can be achieved by an electrodeposition method performed by energizing each of a and 12b. According to the second anode 14, the entire front surface of the light emitting region can be made to emit solid light in any of blue and red colors.

A filter 15 is provided on the outer surface of the front substrate 5. The filter 15 has a function of making the difference in luminance between a lighted portion and a non-lighted portion clear without changing the chromaticity of the light emitting phosphor. Since the ZnO: Zn phosphor is white, when external light is incident on the display surface, the contrast between the lit ZnO: Zn phosphor and the white ZnO: Zn phosphor that is not lit and reflects the external light decreases. ,
It becomes difficult to visually recognize the light emitting pattern. This filter 15
Block the external light to increase the contrast between the light-emitting portion and the non-light-emitting portion, making the display easier to see.

A driving method of the fluorescent display device 1 of the present embodiment will be described. Each phosphor layer 7, 13 of each anode 8, 14 is connected to a cathode 10
When the electrons accelerated and controlled by the control electrodes 9 and 11 are emitted from the control electrodes 9 and 11, they emit light. "FUTABA"
And the date “12:
"00" is displayed in a positive display. The positive display is a display in a form in which a pattern to be displayed emits light.
In this example, the first phosphor layer 7 of the first anode 8 is turned on, and the second phosphor layer 13 is turned off. The portion of the first phosphor layer 7 that does not emit light looks white when external light is reflected. However, since the fluorescent display device 1 of this example has the filter 15 on the front side, the non-light emitting portion of the first phosphor layer 7 has The contrast with the blue light emitting portion is sufficient, and a high-quality positive display can be performed. As shown in FIG. 2, in a background that does not emit light,
The time “12:00” based on the characters “FUTABA” and the date character segment emits light, and a positive display is performed.

In the above-described positive display, the second anode 14 is not turned on. However, the second anode 14 is turned on at the same time as the first anode 8 is turned on.
The red light emitting ZnCdS phosphor may be turned on. The blue positive display by the first anode 8 appears in the red solid display by the second anode 14. At this time, the second anode 1
4, the red display of the background may be controlled in gradation.

Next, the same display is performed by a negative display. The negative display is a display obtained by inverting the positive display, and is a display in which a pattern portion to be displayed of a segment does not emit light, and another portion surrounding the pattern emits light. In this example, the portion of the first anode 8 that is not desired to be displayed is turned on, the portion of the first anode 8 that is not desired to be displayed is not turned on, and the ZnO: Z of the second phosphor layer 13 is not turned on.
Turn on n phosphors. Although the portion of the first anode 8 on the front side that is not to be displayed emits light, the emission color of this portion is the same as the color of the second anode 14 which emits a solid light in the background. Since the first phosphor layer 7 of the first anode 8 does not transmit light from the second anode behind, the portion of the first anode 8 that does not emit light is surrounded by solid blue light emission on the background. Looks black. As shown in FIG. 3, in the background emitting blue light represented by black, the display of “FUTABA” represented by white and “12:00” by the date character segment is displayed as a non-light-emitting portion. And a negative display is performed.

In the case of the negative display, a state in which nothing is displayed means that the first anode 8 and the second anode 14 are formed of ZnO: Zn.
This is a state in which all the phosphors are turned on. At this time, all the display surfaces appear to emit solid blue light.

Next, gradation display is performed. The gradation display is the first
And the second anodes 8 and 14 are of the same color (that is, Z in this example).
nO: Zn phosphor (blue), and
This is a display mode in which the emission luminance on the side of the second phosphor layer 13 is controlled in gradation. According to such a display form, the first on the front side
The display can be changed by changing the perspective of the display by the anode 8. That is, if the luminance of the blue background is changed, the pattern display that emits blue light on the front side may appear to be floating or appear to be retracted. Therefore, if the brightness of the background is continuously increased or decreased, the pattern display on the front side appears or retracts, and the image looks dynamic. The second
If various displays are performed in the same manner when the anode 14 emits red light, a visual effect different from that of the same color can be obtained.

Various display modes such as the above-described positive display, negative display, and gradation display can be arbitrarily switched by a control device (not shown).

In the above-described example, the second phosphor layer 13 is constituted by phosphors of two colors, red and blue. However, only the phosphor of the same color as the first phosphor layer 7 on the front side may be used. Phosphors of three or more colors including phosphors of the same color may be used. In this case, as in this example, the entire back surface is made to emit solid light for each color.

In the present embodiment, in order to cause the two types of phosphors to emit light in the second anode 14 in a seemingly solid form, respectively, the two stripes of the closely coupled two-system striped conductors 1 are combined.
2a and 12b were used. In addition, the second anode conductor is constituted by a large number of dot-shaped conductors divided into a plurality of sets, and each phosphor having a different kind of the second phosphor layer is applied to each set of the dot-shaped conductors. It may be.

[0026]

As described above, the fluorescent display device of the present invention comprises a segment-shaped first phosphor layer on the front side and a second phosphor layer on the rear side which emits a solid light in the same color. Therefore, there is an effect that segment display can be arbitrarily switched between negative and positive on one display device. In addition, if the second phosphor layer on the rear side can be controlled in gradation, it is possible to perform display that changes the perspective of the segment display on the front side. Also, the second on the back
If the phosphor layer can emit light in a color different from that of the first phosphor layer, a positive display by the first phosphor layer can be performed with a different color as a background. As described above, according to the present invention, the function is enhanced as compared with the conventional fluorescent display device, and the display capability is high.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is a diagram showing a positive display in a first example of an embodiment of the present invention.

FIG. 3 is a diagram showing a negative display in the first example of the embodiment of the present invention.

FIG. 4 is a diagram showing a structure of a first anode conductor in a first example of an embodiment of the present invention.

FIG. 5 is a sectional view of a conventional fluorescent display device.

FIG. 6 is a diagram showing a positive display in a conventional fluorescent display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluorescent display device 2 Enclosure 3 Back substrate 5 Front substrate 6 1st anode conductor 7 1st phosphor layer 8 1st anode 12 2nd anode conductor 12a, 12b Stripe anode conductor 13 2nd phosphor layer 14 2nd anode

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01J29 / 30 H01J29 / 30

Claims (6)

[Claims] An envelope having a front substrate and a rear substrate disposed at a predetermined interval; a light-transmitting segment-shaped first anode conductor formed on an inner surface of the front substrate;
A first phosphor layer attached to the first anode conductor and an inner surface of the back substrate are formed to cover a predetermined region surrounding the first phosphor layer as viewed from the front side of the front substrate. Second
An anode conductor and the second anode conductor are attached to the predetermined area surrounding the first phosphor layer when viewed from the front side of the front substrate, and emit light in substantially the same color as the first phosphor layer. And a second phosphor layer. 2. The method according to claim 1, wherein the first phosphor layer is turned on and the second phosphor layer is turned on.
A positive display in which the phosphor layer is turned off, and a negative display in which the first phosphor layer is turned off and the second phosphor layer is turned on.
The fluorescent display device according to claim 1, which can be arbitrarily selected. 3. The fluorescent display device according to claim 1, wherein the first phosphor layer and the second phosphor layer emit light simultaneously, and the emission luminance of the second phosphor layer can be gradation-controlled. 4. The second phosphor layer includes a phosphor that emits light in substantially the same color as the first phosphor layer and a phosphor that emits light in a different color. ,
2. The fluorescent display device according to claim 1, wherein each of the predetermined regions is arranged in a pattern so as to emit light only in the color. 5. The second anode conductor comprises a plurality of striped anode conductors divided into a plurality of sets, and each phosphor of the second phosphor layer is attached to each set of the striped anode conductors. The fluorescent display device according to claim 4, wherein: 6. The second anode conductor is composed of a number of dot-shaped anode conductors divided into a plurality of sets, and each phosphor of the second phosphor layer is attached to each set of the dot-shaped anode conductors. The fluorescent display device according to claim 4, wherein: