KR100278828B1 - Fluorescent Display - Google Patents

Abstract

Negative display and positive display are switched at random to display.

The envelope 2 includes a front substrate 5, a rear substrate 3, and a side plate 4. On the inner surface of the front substrate 5, a ZnO: Zn phosphor is deposited on the first anode conductor on the light transmissive segment, whereby the first anode 8 is provided. On the inner surface of the back substrate 3, a second anode 14 is formed in which the ZnO: Zn phosphor emits light in a dense state so as to surround the first anode 8 in the viewing direction. 10 is a cathode, 9 and 11 are control electrodes. The first anode 8 is turned on and the second phosphor layer 13 is turned off. Positive display by the first anode is performed in the background which does not emit light. The part which you do not want to display of the 1st positive electrode 8 is lighted, the part which you want to display of the 1st positive electrode 8 is made to non-lighting, and the 2nd positive electrode 14 is lighted in a dense state. A negative positive display, in which the non-light emitting portion to be displayed on the first anode 8, which appears to be black, is surrounded by dense blue light emission as a background, is performed.

Description

Fluorescent Display

The present invention relates to a fluorescent display device capable of displaying a predetermined display pattern by switching between negative display and positive display.

5 is a cross-sectional view schematically showing the structure of a conventional fluorescent display device 100. The box envelope is composed of an insulating positive electrode substrate 102, a side plate 103, and a translucent front plate 104 facing the positive electrode substrate 102. On the inner surface of the positive electrode substrate 102, a positive electrode 105 is formed in a predetermined pattern. The phosphor layer 106 is deposited on the anode conductor 105. Inside the envelope 101, a control electrode 107 is provided above the phosphor layer 106, and a filamentary cathode 108, which is an electron source, is provided above the control electrode 107. The inside of the envelope 101 is maintained in a high vacuum state. When an appropriate potential is applied to the control electrode 107 and the anode conductor 105 at the same time as the cathode 108 is energized, the electrons emitted from the cathode 108 are accelerated by the control electrode 107. It is controlled and collides with the phosphor layer 106 of the anode conductor 105 to emit light. Light emission of the phosphor layer 106 is observed in a predetermined pattern through the front plate 104. For example, if the shape of the anode conductor 105 is a segment pattern of "FUTABA" characters or Japanese characters as shown in Fig. 6, the segment part of this shape is observed as a positive display in which light is emitted. In FIG. 6, a white display portion is a non-light emitting portion and a black display portion is a light emitting portion in the segment.

In the conventional phosphor display device having the above structure, it is possible to perform positive display for emitting a specific segment shape, but invert this to turn off the segment part and emit a part other than the segment part surrounding the segment part. Could not switch to. Also in the case of displaying the same segment shape, a negative display having a larger external appearance of the actual light emitting area than a positive display is often preferred in terms of appearance, depending on the purpose and purpose. In recent years, even in the fluorescent display device, a high functionality capable of arbitrarily switching between the negative display and the positive display is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluorescent display device having a high display capability with a function capable of arbitrarily switching between negative display and positive display.

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

2 is a diagram showing a positive display in the first example of the embodiment of the present invention;

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

4 is a structural diagram showing a first cathode conductor in a first example of an embodiment of the present invention;

5 is a cross-sectional view of a conventional fluorescent display device;

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

Explanation of symbols in main part of drawing

1: fluorescent display device 2: outside atmosphere

3: back board 5: front board

6: first cathode conductor 7: first phosphor layer

8: First Anode 12: Second Anode Conductor

12a, 12b: stripe-shaped anode conductor 13: second phosphor layer

14: second anode

The fluorescent display device according to claim 1 includes an enclosure having a front substrate and a rear substrate disposed at predetermined intervals, a first cathode conductor having a light transmitting property formed on an inner surface of the front substrate, and a first anode conductor deposited on the first cathode conductor. A first positive electrode layer, a second positive electrode formed on the inner surface of the rear substrate, and a second positive electrode formed on the rear surface of the front substrate so as to cover a predetermined area surrounding the first fluorescent layer when viewed from the front side of the front substrate; As seen from the front side of the substrate, it has a second phosphor layer which emits the entire predetermined area surrounding the first phosphor substantially in the same color as the first phosphor.

The fluorescence display device of claim 2 is a fluorescence display device according to claim 1, wherein the first phosphor layer is turned on and the positive display is turned off while the second phosphor layer is turned off, and the first phosphor layer is turned off and the second phosphor is turned off. The negative display for lighting the floor can be selected at random.

The fluorescent display device according to claim 3 is characterized in that in the fluorescent display device according to claim 1, it is possible to simultaneously emit light of the first phosphor layer and the second phosphor layer and to control gradation of the luminance of the second phosphor layer. .

The fluorescent display device according to claim 4 is the fluorescent display device according to claim 1, wherein the second phosphor layer includes phosphors emitting substantially the same color as the first phosphor layer, and phosphors emitting different colors. And the plurality of phosphors are each arranged in a pattern that emits the entirety of the predetermined region only in the corresponding color.

The fluorescent display device of claim 5 is the fluorescent display device of claim 4, wherein the second cathode conductor is composed of a plurality of stripe-shaped anode conductors divided into a plurality of sets, and each phosphor of the second phosphor layer is the stripe. It is characterized by being deposited on each group of the positive electrode conductor of the shape.

The fluorescent display device according to claim 6 is the fluorescent display device according to claim 4, wherein the second anode conductor is composed of a plurality of dot-shaped anode conductors divided into a plurality of sets, and each phosphor of the second phosphor layer is the dot-shaped anode. It is characterized by being deposited on each group of the conductor.

Embodiment of the Invention

The 1st example of embodiment of this invention is demonstrated with reference to FIGS. Fig. 1 is a sectional view schematically showing the structure of the fluorescent display device 1 of this example. The box-shaped envelope 2 consists of an insulating back substrate 3 and a side plate 4 and a translucent and insulating front substrate 5 facing the back substrate 3. A glass plate can be used as a material of these envelopes 2. The back board 3, the side board 4, and the front board 5 are sealed by a glass sealing material, and the inside is exhausted in a high vacuum state. On the inner surface of the front substrate 5, a segment-shaped first positive electrode conductor 6 is formed. As shown in FIG. 2, the shape of the 1st positive electrode conductor 6 of this example is the segment pattern of the character of "FUTABA", and the Japanese character. The first positive electrode 6 is made of a transparent conductive film such as indium tin oxide (ITO). The mesh of aluminum is not completely transparent, and is not suitable because the surrounding portion is reflected by external light. The wiring conductor connected to the first positive electrode conductor 6 is also made of ITO.

The first phosphor layer 7 is deposited on the first positive electrode 6, and the first positive electrode 8 is formed. The phosphor constituting the first phosphor layer 7 of the present example is a blue light-emitting ZnO: Zn phosphor.

Inside the enclosure 2, a first control electrode 9 is provided below the first anode 8. The first control electrode 9 is directly fixed on the inner surface of the front substrate 5 by a sealing material such as fritted glass. Near the center of the enclosure 2, which is below the first control electrode 9, a filamentary cathode 10, which is an electron source, is provided. The second control electrode 11 is provided below the cathode 10. The second control electrode 11 is directly fixed to the inner surface of the rear substrate 3 by an encapsulant such as fritted glass.

The second cathode conductor 12 is formed on the inner surface of the back substrate 3. When the second anode conductor 12 is viewed from the front side of the substrate 5 over the first anode 8, the second anode conductor 12 covers a predetermined region on the inner surface of the back substrate 3 so that it appears to surround the first anode 8. Formed. As shown in FIG. 2, the display pattern on the segment of the 1st positive electrode 8 is enclosed safely along the area | region A shown in rectangle in a figure. On the inner surface of the back substrate 3, a second anode 12 is formed in the region A corresponding to the rectangle. As shown in Fig. 4, the second cathode conductor 12 is composed of a plurality of narrow fine stripe anode conductors 12a and 12b divided into two lines. The stripe-shaped anode conductors 12a and 12b of the two systems are combined in a nesting shape with each other, and the driving voltages are separately provided. Unlike the first anode conductor 6, the second cathode conductor 12 does not need to be light-transmissive, and of course, ITO is good, but may be made of an aluminum thin film.

A second phosphor layer 13 is deposited on the second cathode conductor 12, and a second anode 14 is formed. The phosphors constituting the second phosphor layer 13 of the present example are two kinds of the same blue light-emitting ZnO: Zn phosphors as the first anode 8 and red light-emitting ZnCds phosphors. The positive phosphor is separately deposited on each of the two stripe-shaped bipolar conductors 12a and 12b constituting the second positive electrode 12, and as a whole, the second positive electrode 14 is formed in a state where the phosphor is substantially dense. It is attached. Coating color classification of each fluorescent substance can be achieved by the electrodeposition method performed by energizing each stripe-shaped positive electrode conductor 12a, 12b in the solution containing fluorescent substance, respectively. According to the second anode 14, the entire surface of the light emitting area can be emitted in a dense state in either blue or red color.

The filter 15 is provided on the outer surface of the front substrate 5. This filter 15 has a function of clarifying the difference in luminance between the lighting portion and the non-lighting portion without changing the phosphor chromaticity. Since the ZnO: Zn phosphor is white, when external light enters the display surface, the contrast between the lit ZnO: Zn phosphor and the white ZnO: Zn phosphor reflecting external light by non-lighting becomes small, and the light-emitting pattern is recognized. ) Becomes difficult. The filter 15 blocks external light to increase the contrast between the light emitting portion and the non-light emitting portion, making the display easy to see.

The driving method of the fluorescent display device 1 of this example will be described. As shown in Fig. 2, the phosphor layers 7 and 13 of the anodes 8 and 14 are emitted from the cathode 10, and light is emitted by the electrons accelerated and controlled by the control electrodes 9 and 11. Positive display is performed for the character display of "FUTABA" and the display of time "12:00" according to the Japanese character segment. Positive display is a display in which a pattern to be displayed is made to emit light. In this embodiment, the first phosphor layer 7 of the first anode 8 is turned on and the second phosphor layer 13 is turned off. The non-emitted portion of the first phosphor layer 7 appears white when it reflects external light, but the fluorescent display device 1 of this example has a filter on the front side, so the contrast between the white non-emission portion and the blue luminescent portion is Is sufficient, high quality positive display is performed. As shown in Fig. 2, positive display is performed by emitting light of the character "FUTABA" and the time "12:00" according to the Japanese character segment in the background of non-emission.

In the positive display, the second anode 14 is turned off, but the first anode 8 is turned on, and the red ZnCds phosphor of the second anode 14 is turned on. A blue positive display by the first anode 8 is shown during the red dense display by the second anode 14. At this time, the red display of the white by the second anode 14 may be grayscale controlled.

Next, the same display is performed in negative display. Negative display is a display in which positive display is inverted, and the pattern portion to be displayed in the segment does not emit light, and the other portion in which this is important emits light. In the present example, the portion of the first anode 8 that is not displayed is turned on, and the portion of the first anode 8 is not turned on, but the ZnO: Zn phosphor of the second phosphor layer 13 is turned on. The portion of the first anode 8 on the front side that is not to be displayed is emitting light, but the emission color of this portion is the same color as the second anode 14 emitting light in a dense state in the background. Since the first phosphor layer 7 of the first anode 8 does not pass light from the second anode at the rear, the non-emitting portion of the first anode 8 is surrounded by dense blue light emission in the background and blackened. see. As shown in FIG. 3, in the background emitting black and blue light, the character of "FUTABA" displayed white and the character "12:00" corresponding to the character segment of Japanese are displayed as non-emitting portions, and negative display is performed. All.

In the case of this negative display, a state in which nothing is displayed is a state in which both ZnO: Zn phosphors of the first anode 8 and the second anode 14 are lit. At this time, the display surface is all emitted blue in a compact state.

Next, gradation display is performed. The gradation display is a display state in which both the first and second anodes 8 and 14 emit light of the same color (i.e., blue by the ZnO: Zn phosphor in this example), and the gradation control of the second phosphor layer 13 is performed. to be. According to such a display form, the perspective of the display by the first anode 8 on the front side can be changed and displayed. In other words, if the blue brightness is changed, the pattern display which is emitting blue from the front side appears or appears to be drawn. Thus, when the brightness is continuously raised and lowered, the pattern display on the front side comes out and enters and is dynamically seen. In the case where the second anode 14 emits red light, when various displays are performed in the same manner, a visual effect different from that of the same color can be obtained.

Various display modes such as the positive display, negative display, gradation display, and the like can be arbitrarily changed in a control device not shown.

In the above-described example, the second phosphor layer 13 is composed of two colors of red and blue phosphors, but may be composed of only phosphors of the same color as the first phosphor layer 7 on the front side, and phosphors of three or more colors including the same phosphor. May be used. In this case, as in the present example, the entire back surface of each color is emitted in a dense state.

In this example, two systems of stripe-shaped conductors 12a and 12b that are precisely combined to emit two kinds of phosphors separately in the appearance of dense in the second anode 14 are used. In addition to this, a plurality of dot-shaped conductors divided into a plurality of sets may constitute the second positive electrode conductor, and each phosphor having a different type of second phosphor layer may be deposited on each of the dot-shaped conductors.

As described above, the fluorescent display device of the present invention has the first phosphor layer on the front side side and the second phosphor layer on the back side emitting light in a dense state at the same color. There is an effect that can be arbitrarily switched and marked with a cover letter. In addition, when gray scale control of the second phosphor layer on the rear side can be performed, display for changing the perspective of the front segment display can be performed. If the second phosphor layer on the rear surface is made to emit light different from that of the first phosphor layer, positive display by the first phosphor layer can be performed with a different color as white. As described above, according to the present invention, the display device is highly functionalized compared to the conventional fluorescent display device, and has an effect of high display capability.

Claims (6)

An envelope having a front substrate and a rear substrate disposed at a predetermined interval, a first anode conductor having a light transmitting property formed on an inner surface of the front substrate, a first phosphor layer deposited on the first cathode conductor, and the front surface A second cathode conductor formed on an inner surface of the rear substrate so as to cover a predetermined region surrounding the first phosphor layer when viewed from a front side of the substrate, and the first phosphor formed on the front surface of the front substrate; And a second phosphor layer which emits substantially the same color as the first phosphor layer in a predetermined area surrounding the layer. The method according to claim 1, wherein the positive display for turning on the first phosphor layer and turning off the second phosphor layer and the negative display for turning off the first phosphor layer and turning on the second phosphor layer can be arbitrarily selected. Fluorescent display device characterized by. 2. The fluorescent display device according to claim 1, wherein the first and second phosphor layers are simultaneously emitted, and the luminance of the second phosphor layer can be grayscale controlled. 2. The light emitting device of claim 1, wherein the second phosphor layer includes phosphors emitting light in a color different from phosphors emitting light in substantially the same color as the first phosphor layer, and each of the plurality of phosphors covers the entire area. A fluorescent display device arranged in a pattern that emits light only by color. The method of claim 4, wherein the second cathode conductor is composed of a plurality of stripe-shaped anode conductors divided into a plurality of sets, and each phosphor of the second phosphor layer is deposited on each of the stripe-shaped anode conductors. Fluorescent display device. 5. The method of claim 4, wherein the second cathode conductor is composed of a plurality of dot-shaped anode conductors divided into a plurality of sets, and each phosphor of the second phosphor layer is deposited on each of the dot-shaped anode conductors. Fluorescent display device.