JP2001222241A - Full-color display element and fluorescence emitting tube for its light source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source whose structure is simple and which is suitable for the thinning of a full-color display element and in which light emission luminance is uniform in the full-color display element consisting of a light source and liquid crystal. SOLUTION: Phosphors 351 to 35n having strip shaped electrodes 341 to 34n are repeated in the order of a phosphor for emitting a red light R, a phosphor for emitting a green light G and a phosphor for emitting a blue light B and phosphors 371 to 37n having strip shaped electrodes 361 to 36n are repeated in the order of a phosphor for emitting a green light G, a phosphor for emitting a blue light B and a phosphor for emitting a red light R and they are arranged so that phosphors of the same color are not overlapped at up and down sides. When phosphors 351 to 35n are made to emit lights, the electrodes 341 to 34n are driven as anode electrodes and the electrodes 361 to 36n are driven as control electrodes of electrons which are emitted from a filament 38 to anodes. When phosphors 371 to 37n are made to emit lights, in contrast with the above description, the electrodes 361 to 36n are driven as anode electrodes and the electrodes 341 to 34n are driven as control electrodes. Voltages of the control electrodes near the filament 38 are made different from those of control electrodes far from the filament to make the light emission luminance to be uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full-color display device in which a light source is combined with an optical shutter using liquid crystal or ferroelectric ceramics (for example, titanate) and a fluorescent light emitting tube for the light source.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal display device generally performs color display using a color filter. Recently, a fluorescent lamp which emits red light, green light, and blue light without using a color filter is used. A so-called filled sequential type full-color display element has been proposed. (For example, magazine "Electronic Technology" 1998-7 No. 8-
See page 12. )

FIG. 10 shows a conventional filled-sequential type full-color display element. FIG. 10 (a)
10B is a plan view, and FIG. 10B is a cross-sectional view in the direction of arrow A in FIG. The liquid crystal panel is placed on the backlight unit. The backlight unit in FIG.
.., A fluorescent plate 91 </ b> R, 91 </ b> G, 91 </ b> B,... In a housing 92, a reflector 93 at the bottom, a dimmer 94 (including a diffusion plate) at the top, and a polarizing plate 95. Fluorescent lamps 91R, 91G, 91B
Emits red light, green light, and blue light. For the fluorescent lamps, for example, three sets of nine lamps are arranged side by side as one set for R, G, and B. In the field sequential method,
The R, G, and B lamps are sequentially flashed in a time-division manner, and the process is repeated. Light from the fluorescent lamp is directly and reflected by the reflection plate 93 to irradiate the light control plate 94 and the polarization plate 95. Light control plate 9
4 and the polarizing plate 95 are optical members for making the luminance of the light illuminating the liquid crystal panel uniform and for aligning the polarization plane of the light.

[0004]

A conventional filled-sequential type backlight unit structurally requires a reflector and a dimmer, so that it is difficult to reduce the thickness and the cost is increased. The thickness of the backlight unit is 1.5 to 2.5 times the diameter of the fluorescent lamp. Dimmer,
There is a loss of light due to the polarizer, and the total light utilization is 60
%. Fluorescent lamps, which are currently used mainly in the cold cathode type, have a temperature dependency, and in the case of the filled sequential method, the fluorescent lamp must be turned on and off within a few milliseconds. It is necessary to take measures to reduce the heat radiation of the lamp.

In addition, since the lighting voltage requires several hundred volts, an inverter is required and the cost is increased.
In particular, in the case of the filled-sequential system, the number of fluorescent lamps must be increased because the brightness of the light applied to the liquid crystal panel is limited by the use of a dimmer plate, but the number of inverters must be increased accordingly. Become. In view of these points, the present invention uses a backlight light source and its light source, which is suitable for thinning, has excellent uniformity of light brightness, has low light loss, can be driven at a low voltage, does not require an inverter, and uses an inverter. It is another object of the present invention to provide a full-color display device.

[0006]

The applicant of the present invention has provided a fluorescent display tube with a filament provided between the first and second substrates on which electrodes are formed, and when the electrode of one substrate is an anode electrode, the other substrate. Invented was a so-called gridless type electrode, which operates as a control electrode for electrons emitted from the filament to the anode electrode, and operates in the opposite manner when the electrode on the other substrate is the anode electrode. (See Japanese Patent Application No. 2000-3369.) The invention of the present application has solved the above-mentioned problem by forming a fluorescent light emitting tube for a light source using the technology of the gridless fluorescent display tube.

The fluorescent light emitting tube of the present invention is provided with a first substrate on which an electrode coated with a phosphor is formed, a second substrate on which an electrode coated with a phosphor is formed, and between the first and second substrates. When the electrode on the first substrate is an anode electrode, the electrode on the second substrate is a control electrode, and when the electrode on the second substrate is an anode electrode, the electrode on the first substrate is a control electrode. In the arc tube, an electrode of one of the first substrate and the second substrate has a stripe shape, an electrode of the other substrate has a solid shape, and the electrode of the one substrate has a phosphor for emitting red light and a green light. Two types of phosphors, one of a phosphor for emitting light and a phosphor for emitting blue light, are alternately applied one by one to each stripe-shaped electrode, and the remaining phosphor is applied to the solid electrode on the other substrate. I have.

The fluorescent light emitting tube of the present invention is provided with a first substrate on which an electrode coated with a phosphor is formed, a second substrate on which an electrode coated with a phosphor is formed, and between the first and second substrates. The first substrate electrode is an anode electrode, the second substrate electrode is a control electrode when the first substrate electrode is an anode electrode, and the first substrate electrode is a control electrode when the second substrate electrode is an anode electrode. The electrodes of the first substrate and the electrodes of the second substrate are both stripe-shaped, and the phosphors for red light emission, the green light emission, and the blue light emission phosphor are applied to the electrodes of both substrates in stripe electrodes. It is applied one by one sequentially.

In the fluorescent tube according to the present invention, when both the electrodes of the first substrate and the electrodes of the second substrate are striped, the striped electrodes of the first substrate and the opposing striped electrodes of the second substrate have And phosphors having different emission colors are applied. The fluorescent light emitting tube of the present invention includes a first substrate on which an electrode coated with a phosphor is formed, a second substrate on which an electrode coated with a phosphor is formed, and a filament provided between the first substrate and the second substrate. A fluorescent emission tube in which the electrode of the second substrate is a control electrode when the electrode of the first substrate is an anode electrode, and the electrode of the first substrate is a control electrode when the electrode of the second substrate is an anode electrode. The electrode of the first substrate and the electrode of the second substrate are both striped, and the electrode of one of the two substrates has a phosphor for emitting red light, a phosphor for emitting green light,
Two types of blue light emitting phosphors are alternately applied to each stripe-shaped electrode one by one, and the remaining one type of phosphor is applied to the stripe-shaped electrode on the other substrate.

[0010] The fluorescent light emitting tube of the present invention comprises a first substrate having electrodes formed thereon, a second substrate having electrodes formed thereon, and a third substrate having electrodes formed on both surfaces thereof between the first and second substrates. A substrate, a filament provided between the first substrate and the third substrate,
A filament provided between the third substrate and the second substrate; when the electrode of the first substrate is an anode electrode, the electrode on one surface of the third substrate is a control electrode; When the electrode on the surface is the anode electrode, the electrode on the first substrate is the control electrode, and when the electrode on the other surface of the third substrate is the anode electrode, the electrode on the second substrate is the control electrode. When the electrode is an anode electrode, the electrodes on the first substrate, the electrodes on the second substrate, and the electrodes on both surfaces of the third substrate are all solid in a fluorescent tube in which the electrode on the other surface of the third substrate is a control electrode. A phosphor is applied to electrodes on at least three of the four surfaces of the first substrate, the second substrate, and the third substrate,
One type of phosphor for red light emission, one for green light emission, and one for blue light emission are coated on the electrodes of each substrate.

The fluorescent tube according to the present invention comprises a first substrate having electrodes formed thereon, a second substrate having electrodes formed thereon, and a third substrate having electrodes formed on both surfaces thereof between the first substrate and the second substrate. A substrate, a filament provided between the first substrate and the third substrate,
A filament provided between the third substrate and the second substrate; when the electrode of the first substrate is an anode electrode, the electrode on one surface of the third substrate is a control electrode; When the electrode on the surface is the anode electrode, the electrode on the first substrate is the control electrode, and when the electrode on the other surface of the third substrate is the anode electrode, the electrode on the second substrate is the control electrode. When the electrode is an anode electrode, the electrodes on the first substrate, the electrodes on the second substrate, and the electrodes on both surfaces of the third substrate are all stripes in a fluorescent tube in which the electrode on the other surface of the third substrate is a control electrode. And a phosphor is applied to electrodes on at least three of the four surfaces of the first substrate, the second substrate, and the third substrate, and a phosphor for red light emission and a green light emission are applied to the electrodes of each substrate. Phosphor and blue light emitting phosphor are applied one by one.

In the fluorescent tube of the present invention, the electrode farthest from the light emitting surface of the fluorescent tube among the electrodes formed on the substrate is:
It is made of metal and has the function of a light reflector. In the fluorescent tube according to the present invention, the control voltage applied to the control electrode is made different between the control electrode that is closest to the filament and the control electrode that is far from the filament, so that the light emission luminance is made uniform.

The fluorescent luminous tube of the present invention drives a red light-emitting phosphor, a green light-emitting phosphor, and an electrode coated with a blue light-emitting phosphor in a time-division manner to emit red light, green light,
And blue light emission are sequentially and repeatedly emitted. According to the present invention, a full-color display element is configured by combining the fluorescent arc tube of the present invention with an optical shutter panel such as a liquid crystal or a ferroelectric ceramic.

[0014]

FIG. 1 shows a fluorescent tube according to a first embodiment of the present invention and a full-color display device in which the fluorescent tube and a liquid crystal panel are combined. Fig. 1 (a)
1 is a plan view, FIG. 1B is a sectional view in the direction of arrow A in FIG. 1A, and FIG. 1C is a sectional view in the direction of arrow B in FIG. 11 is a first glass substrate constituting a vacuum vessel, 12 is a second glass substrate, 13 is a glass side plate, 14 is a filament, 15 is a metal electrode,
6 is a phosphor, 171 to 17n are transparent electrodes of ITO or the like, and 181 to 18n are phosphors. The electrode 15 has a solid shape, and the phosphor 16 is applied in a solid shape.
The electrodes 171 to 17n are stripe-shaped, and
To 18n are applied in stripes. The filament 14 is stretched in the longitudinal direction of the electrodes 171 to 17n.

As the phosphor applied to the electrodes 15, 171-17n, for example, the phosphor 16 emits green light (G), and the phosphors 181-18n emit red light (R), blue light ( Those which emit B) are applied alternately. Which phosphor is applied to which electrode is selected in consideration of a necessary white balance. For example, a white color temperature 93
In the case of setting to 00K, adjustment is performed so that the luminance ratio G: R: B = 6: 3: 1. However, G, R, B used
Are phosphors for general television.

The electrodes 171 to 17n are, for example, 171,
It is divided into two groups of an odd-numbered electrode group such as 173 and an even-numbered electrode group such as 172 and 174. The odd-numbered electrode group is used for emitting blue light.
The even electrode group is selected for red light emission. The electrodes of the odd-numbered electrode group and the even-numbered electrode group are commonly connected to each other. 3 of odd electrode group, even electrode group, electrode 15
The electrodes of the group are sequentially selected in a time-sharing manner, and emit red light, green light, and blue light repeatedly.

In the case of FIG. 1, the substrate 12 is a light emitting surface for emitting light from the fluorescent tube to the liquid crystal panel. The electrode 15 at the farthest position from this surface is made of metal such as aluminum. Therefore, it operates as an electrode and has a function as a light reflection plate, and also has the same function as the reflection plate 93 in FIG. Here, the light generated by the emission of the phosphor 16 is applied to the second substrate 12 (the portion between the electrodes 171 to 17n to which the phosphors 181 to 18n are applied, the phosphors 181 to 1n).
8n, portions of electrodes 171 to 17n, and second substrate 12)
Is emitted through. The phosphor has a particle layer of 1.5.
Since the transmittance is about 70% or more in the visible light region in a layer or so, the light attenuation is only a little. Therefore, the fluorescent materials 181 to 181
18n, the electrodes 171 to 17n, and the second substrate 12 have high light-transmitting properties, and do not hinder light transmission. This is the same in other embodiments.

Next, a method of driving the fluorescent tube of FIG. 1 will be described. When one of the electrodes 15 and the electrodes 171 to 17n is a light emitting electrode, that is, an anode electrode, the other operates as a control electrode, and when the other is an anode electrode, one operates as a control electrode. That is, when the electrode 15 is the anode electrode, the electrodes 171 to 17n control electrons emitted from the filament 14 to the electrode 15 as control electrodes of the electrode 15. When the electrodes 171 to 17n are anode electrodes, the operation is reversed. Electrode 15 and electrodes 171-1
7n are arranged in a range where electrons emitted from the filament can be controlled by respective control voltages.

FIG. 2 shows the electrodes 15, 1 of the fluorescent tube of FIG.
The driving voltages applied to the transistors 71 to 17n and the method of applying the driving voltages are shown. (A) shows the drive voltage applied to the odd-numbered electrode group of the electrodes 171 to 17n, (b) shows the drive voltage applied to the even-numbered electrode group, and (c) shows the drive voltage applied to the electrode 15.

The odd-numbered electrode group, the even-numbered electrode group, and the electrode 15 include:
The On voltage and the Off voltage are sequentially applied in a time sharing manner. An On voltage is applied to each electrode group and the electrode 15 at a rate of once every three times. Each electrode is turned on when the On voltage is applied, and turned off when the Off voltage is applied. In FIG. 2, an On voltage is applied to the odd-numbered electrode group, the even-numbered electrode group, and the electrode 15 in this order. When an On voltage is applied to the electrode 15,
An Off voltage is applied to the odd-numbered electrode group and the even-numbered electrode group. When an On voltage is applied to the odd-numbered electrode group or the even-numbered electrode group, an Off voltage is applied to the electrode 15 and the even-numbered electrode group or the odd-numbered electrode group. For example, if the electrode 15 is On
When a voltage is applied, the electrode 15 becomes a light emitting electrode. At this time, the odd-numbered electrode group and the even-numbered electrode group have Off
When a voltage is applied, the electrode 15 operates as a control electrode.
When the On voltage is applied to the odd-numbered electrode group or the even-numbered electrode group, those electrode groups become light emitting electrodes. At this time, an Off voltage is applied to the electrode 15, and the electrode 15 operates as a control electrode of the odd-numbered electrode group or the even-numbered electrode group.

In the case of FIG. 2, the On voltage is 12 V to several tens.
V and Off voltages are set to 0V to several volts.

FIG. 3 shows a fluorescent tube according to a second embodiment of the present invention and a full-color display device in which the fluorescent tube and a liquid crystal panel are combined. 3A is a plan view, and FIG. 3B is a cross-sectional view in the direction of arrow A in FIG. 21 is a first substrate of glass constituting a vacuum vessel,
22 is a second glass substrate, 23 is a glass side plate, 2
4 is a third substrate of intermediate glass, 25 is a metal electrode,
26 is a phosphor, 27 is a transparent electrode, 28 is a phosphor,
29 is a transparent electrode, 210 is a transparent electrode, 211 is a phosphor, 212 and 213 are filaments, and 214 is a support member for the third substrate 24.

The electrodes 25, 27, 29, 210 have a solid shape, and the electrodes 25, 27, 210 have phosphors 26,
28 and 211 are applied in a solid pattern. The electrodes 29
No phosphor is applied. 26 is a green light emitting phosphor, 28 is a blue light emitting phosphor, and 211 is a red light emitting phosphor.

The electrode 25 and the phosphor 26, the electrode 27 and the phosphor 28, and the filament 212 constitute a red light and blue light emitting portion.
1 and the filament 213 constitute a green light emitting portion. Both light emitting units are, for example, electrodes 210 and 27,
In the order of 25, green light, blue light and red light are emitted in a time-division manner. In the case of FIG. 3, the light generated by the emission of the phosphor 26 is the phosphor 28, 211, the electrodes 27, 29, 210,
Since the light is radiated through the third substrate 24 and the second substrate 22, the attenuation is the highest and the luminance is the lowest. Therefore, a phosphor may be applied to the electrode 29 without applying the phosphor to the electrode 25. The electrodes 25, 27, 29, 21
The fluorescent material may be applied to all four electrodes 0, and the fluorescent material at the position where the attenuation is greatest may be applied to both of the two electrodes. This is the same in the case of FIG. 6 described later.

Next, a method of driving the fluorescent tube of FIG. 3 will be described. One of the electrode 25 and the electrode 27 is a light-emitting electrode,
That is, when the electrode is an anode, the other operates as a control electrode, and when the other is an anode, one operates as a control electrode. That is, when the electrode 25 is an anode electrode, the electrode 27 controls electrons emitted from the filament 212 to the electrode 25 as a control electrode of the electrode 25.
When the electrode 27 is a light-emitting electrode, the operation is reversed. When the electrode 210 is an anode electrode, the electrode 29 controls electrons emitted from the filament 213 to the electrode 210 as a control electrode of the electrode 210.

FIG. 4 shows the electrodes 25, 2 of the fluorescent tube of FIG.
The driving voltages applied to the reference numerals 7, 29, and 210 and the method of applying the driving voltages will be described. (A) shows the driving voltage applied to the electrode 210, (b) shows the driving voltage applied to the electrode 29,
(C) is a driving voltage applied to the electrode 27, and (d) is a driving voltage.
The driving voltage applied to the electrode 25 is shown. Electrodes 25, 27,
The On voltage and the Off voltage are sequentially applied to the electrode 210 in a time-sharing manner, and the Off voltage is sequentially applied to the electrode 29 in a time-sharing manner. FIG. 4 applies an On voltage in the order of the electrodes 210, 25, and 27.

First, regarding the electrodes 25 and 27, when an On voltage is applied to the electrode 25,
An (+) Off voltage is applied. When an On voltage is applied to the electrode 27, a (+) Off voltage is applied to the electrode 25. When the On voltage is not applied to both of the electrodes 25 and 27, that is, when the On voltage is applied to the electrode 210, the electrodes 25 and 27 are respectively (-).
Is applied. In this case, the (+) Off voltage causes the electrons of the filament 212 to emit light from the light emitting electrodes 25 and 27.
And the Off voltage of (−) acts to prevent the emission of electrons from the filament 212 to the electrodes 25 and 27, respectively.

Next, regarding the electrodes 29 and 210, when an On voltage is applied to the electrode 210, a (+) Off voltage is applied to the electrode 29. On electrode 210
When no voltage is applied, that is, when the electrodes 25 and 27
When the n voltage is applied, the electrodes 29 and 210
An (-) Off voltage is applied. in this case,
The (+) Off voltage acts to emit electrons of the filament 213 to the light emitting electrode 210, and the (-) Off voltage
The voltage acts to block the emission of electrons from the filament 213 to the electrode 210, respectively.

In the case of FIG. 4, the On voltage is 12 V to several tens.
V, the (+) Off voltage is set to 0V to several V, and the (-) Off voltage is set to -10V to less than 0V.
0 V is applied to the filaments 212 and 213. Here, when a voltage other than 0V, for example, 2V is applied to the filaments 212 and 213, the (+) Off voltage is 2V to several V, and the (-) Off voltage is -10V to
Set to less than 2V. That is, according to the voltage applied to the filament, the (+) Off voltage is set to a value between the filament potential and the filament potential.
The Off voltage of several V and (−) may be set to -10 V to less than the filament potential.

FIG. 5 shows a fluorescent tube according to a third embodiment of the present invention and a full-color display element in which the fluorescent tube and a liquid crystal panel are combined. 5A is a plan view, FIG. 5B is a cross-sectional view in the direction of arrow A in FIG. 5A, and FIG. 5C is a cross-sectional view in the direction of arrow B in FIG. Is shown.

Reference numeral 31 denotes the first glass of the vacuum container.
Substrate, 32 is a second glass substrate, 33 is a glass side plate, 341 to 34n are metal electrodes, 351 to 35n
Are phosphors, 361 to 36n are transparent electrodes, 371 to
7n is a phosphor, and 38 is a filament. Electrode 3
Each of 41 to 34n and 361 to 36n has a stripe shape, and the phosphor is applied in a stripe shape as shown in FIGS. 5B and 5C.

As shown in FIG. 5C, the phosphors 351 to 35n are repeatedly applied in the order of the green light emitting phosphor G, the blue light emitting phosphor B, and the red light emitting phosphor R. The phosphors 371 to 37n are repeatedly applied in the order of the phosphor R for emitting red light, the phosphor G for emitting green light, and the phosphor B for emitting blue light as shown in FIG. 5B. As described above, the arrangement order of R, G, and B is shifted between the phosphors 351 to 35n and 371 to 37n so that the emission colors of the opposing electrodes of the first substrate 31 and the second substrate 32 do not overlap. It is. The electrodes 341 to 34n and 361 to 36n are
When 4n is a light emitting electrode, that is, an anode electrode, the electrode 36
1-36n operate as control electrodes, and electrodes 361-3
When 6n is the anode electrode, the electrodes 341-34n are:
Operates as a control electrode.

The light emission luminance of each electrode is different between the electrode closest to the filament and the electrodes on both sides thereof. In particular,
On the anode electrode closest to the filament, the current density is higher than that between the filaments, resulting in a higher brightness. The difference in luminance in that case may be 50% or more depending on the voltage. To reduce this difference, the number of filaments may be increased, but the structure becomes complicated and the cost increases. In the example of FIG. 5, for example, when the electrodes 341 to 34n are control electrodes, 0 V, 342 and 344 are applied to the electrode 343 closest to the filament 38.
2V and 341 and 345 apply 4V, respectively.
As described above, a gradient is provided for the control voltage applied to each electrode,
The amount of electrons emitted from the filament 38 to each of the electrodes 361 to 365 can be made uniform, and the light emission luminance can be made uniform. That is, the anode current density becomes uniform, thereby making the luminance uniform. Hereinafter, other electrodes 346 to 34n
Similarly, for the other filaments, a gradient can be provided to the control voltage to make the light emission luminance uniform. When the electrodes 361 to 36n are control electrodes, the filament 38
0V to the electrode 363, 2V to 362 and 364,
4V may be applied to 361 and 365, respectively. In the same manner, the electrodes 366 to 36n can be provided with a gradient in the control voltage to make the light emission luminance uniform.

In the example of FIG. 5, the first substrate 31 and the second substrate 3
2 fluorescent light for emitting the same color light, for example, a red light emitting phosphor R
Can be emitted at the same time, and the emission luminance of each of the R, G, and B colors is twice that of a single substrate.

FIG. 6 shows a fluorescent tube according to a fourth embodiment of the present invention and a full-color display device in which the fluorescent tube and a liquid crystal panel are combined. 6A is a plan view, and FIG. 6B is a cross-sectional view in the direction of arrow A in FIG.

Reference numeral 41 denotes the first glass of the vacuum container.
Substrate, 42 is a second glass substrate, 43 is a glass side plate, 44 is a third intermediate glass substrate, 451 to 45n
Is a metal electrode; 461 to 46n are phosphors;
47 n is a transparent electrode, 481 to 48 n are phosphors, 49
Are the support members of the third substrate 44, and 4101 to 410n are
The transparent electrodes 4111 to 411n are phosphors,
412n is a transparent electrode, 4131 to 413n are phosphors, and 414 and 415 are filaments. Electrode 45
1 to 45n, 471 to 47n, 4101 to 410n, 4
Each of 121 to 412n has a stripe shape, and the phosphor is applied in a stripe shape.

461 to 46n are blue light emitting phosphors,
81 to 48n and 4111 to 411n are red light emitting phosphors, and 4131 to 413n are green light emitting phosphors. This combination can be arbitrarily selected in consideration of the white balance. Electrodes 451-45n and phosphors 461-
46n, electrodes 471-47n and phosphors 481-48n,
And a filament 415 constitute a light emitting portion for blue light and red light, and include electrodes 4101 to 410 n and phosphors 4111 to 411.
11n, electrodes 4121-412n and phosphors 4131-4
13n and the filament 414 constitute a light emitting unit for green light and red light. Both light-emitting units emit green light, blue light, and red light in a time-division manner. Here, in the case of red light, the phosphors 481 to 48n and the phosphors 4111 to 411n emit light simultaneously.

The electrodes 451 to 45n and 471 to 47n are
When the electrodes 451 to 45n are light emitting electrodes, that is, anode electrodes, the electrodes 471 to 47n operate as control electrodes,
When the electrodes 471 to 47n are anode electrodes, the electrode 45
1 to 45n operate as control electrodes. Similarly, electrode 4
When one of the electrodes 101 to 410n and the electrodes 4121 to 412n is an anode electrode, the other operates as a control electrode, and when the other is an anode electrode, one operates as a control electrode.

In the example of FIG. 6 as well, in order to make the light emission luminance of the electrode close to the filament and the light emission luminance of the electrode far from the filament uniform, the control voltage applied to each control electrode is provided with a gradient as in the example of FIG. It can be uniform.

FIG. 7 is a cross-sectional view of a model of the anode electrode (light-emitting electrode) and the control electrode obtained by performing an electric field analysis simulation on the effect of the potential gradient of the control voltage described with reference to FIGS. 61 is a glass anode substrate (first substrate), 62 is a glass back substrate (second substrate), 63
Are side plates; 641 to 649 are striped anode electrodes; 651 to 659 are striped back electrodes;
61 and 662 are filaments. Back electrode 651
Reference numerals 659 to 659 denote control electrodes for electrons emitted from the filaments 661 and 662 to the anode electrodes 641 to 649. Here, the height of the side plate is 0.86 mm, the interval between the filaments is 2.0 mm, and the filaments are arranged between the two substrates. The anode voltage is 12.0
V, the filament potential is 0V.

FIG. 8 shows the result of simulation of the model of FIG. FIG. 8A shows the result when the control voltage applied to the control electrode has a gradient, and FIG. 8B shows the result when the control voltage has no gradient. 8, the horizontal axis represents the horizontal distance (Dista) of the anode substrate in FIG.
1.00) indicates that filaments 661 and 662
, -1.00 corresponds to the left end of the anode electrode 641, and 3.00 corresponds to the right end of the anode electrode 649. The vertical axis indicates the current density (Ip) of the anode electrode and the current density (Iback) of the back electrode.

FIG. 8A shows the case where the control voltage (Eback) applied to the back electrode is 0V, 2V, 4V, and 0V, 2V, 4V.
The results for two cases, 3V and 6V, are shown. 0V is applied to the back electrodes 653 and 657, and 2V and 3V are applied to the back electrodes 653 and 657.
2,654,656,658 and 4V and 6V are applied to the back electrodes 651,655,659. FIG. 8 (b)
The results in two cases where the control voltage (Eback) is 0V and 3V are shown.

In the case of FIG. 8A, in each case, the current density (Ip) becomes substantially uniform near and on both sides of the filament, and the current density (Ib) which does not contribute to light emission is obtained.
ack) hardly flows. That is, the emission luminance of each of the anode electrodes becomes uniform, and there is almost no reactive current.

In the case of FIG. 8B, the control voltage (Ebac
k) is 0 V, the current density (Iba
ck) is almost non-existent, but the current density (Ip) contributing to light emission is also small in the filaments 661 and 662.
It almost disappears in the middle part between. That is, the anode electrode at the intermediate portion between the filament 661 and the filament 662 does not emit light. Control voltage (Eba
When ck) is 3 V, the current density (Ip) becomes almost uniform at all anode electrodes, but the reactive current increases near the filaments 661 and 662.

From this result, it can be seen that it is effective to provide a gradient in the control voltage in order to make the current density of the anode electrode uniform, that is, to make the light emission luminance uniform. However, even when the gradient is not provided, the electrode of the fluorescent tube of the present invention is
Since they can be arranged at a narrow interval, the emission luminance can be made much more uniform than when a conventional fluorescent lamp is used. In addition, by reducing the distance between the filaments, the light emission luminance can be made uniform.

Potential gradient voltages 0V, 2V, 4V, 3V, 6
V and the like may be supplied by using a power supply that generates these voltages, or may be supplied by a voltage dividing circuit using a resistor or the like. In the case of using a resistance, the resistance value of each electrode may be different depending on the shape and material of the control electrode.

FIG. 9 shows an example in which a plurality of fluorescent tubes of the present invention are juxtaposed. When a backlight unit corresponding to a large-screen liquid crystal display device or the like is required, it may be better to juxtapose a plurality of fluorescent light emitting tubes rather than one large fluorescent light emitting tube. FIG. 9 shows the fluorescent tubes 51 to 5.
4 are juxtaposed, but the number juxtaposed is arbitrary. Also, the juxtaposed fluorescent light emitting tubes are the fourth to fourth embodiments.
Any of the fluorescent light emitting tubes of the embodiments and the fluorescent light emitting tubes of other embodiments may be used.

In the above embodiment, an example was described in which the filament was arranged so as to be substantially parallel to the electrode in the longitudinal direction of the stripe-shaped electrode. You may arrange | position in the cross direction. In the embodiment, the liquid crystal panel has been described as the optical shutter side panel combined with the fluorescent light emitting tube of the present invention. However, those using ferroelectric ceramics (PZT, PLZT, etc.) such as barium titanate, other optical fiber switches and semiconductors It can be combined with one using an optical switch or the like.

[0049]

The fluorescent light emitting tube of the present invention does not require an essential reflecting plate and a dimmer plate in the conventional reflecting plate type backlight unit, so that the structure is simple, the thickness can be reduced, and the cost is low. Become. Also, the inverter required for the fluorescent lamp is not required. In the fluorescent light emitting tube of the present invention, the electrode on the opposite side to the optical shutter panel is made of metal, so that this electrode can also have the function of a light reflecting plate. Since the fluorescent light emitting tube of the present invention does not include a light control plate, there is no light loss due to these.

Since the fluorescent light emitting tube of the present invention uses a filament, it is not necessary to provide a means for reducing heat radiation unlike a conventional cold cathode fluorescent lamp, and the fluorescent light emitting tube can be easily flashed at a high speed. In the fluorescent light emitting tube of the present invention, the emission luminance can be easily made uniform by reducing the width of the stripe-shaped electrodes and increasing the electrode density. In addition, when the solid electrode is used, the entire surface emits light, so that the light emission luminance can be easily made uniform.

In the fluorescent tube according to the present invention, by providing a potential gradient in the control voltage, the luminance can be easily made uniform by an electric method without increasing the number of filaments. The fluorescent tube of the present invention can emit light from the phosphors of the electrodes on both substrates with a simple structure in which a filament is simply arranged between two substrates provided with electrodes. In addition, in order to drive the electrodes of a plurality of substrates in a time-division manner to emit red light, green light, and blue light, the electrodes of one substrate are driven in a time-division manner to emit red light, green light, and blue light. As compared with the case of emitting light, it is possible to obtain twice or three times the emission luminance.

The invention of the present application is a combination of the fluorescent luminous tube of the present invention and an optical shutter panel to provide a thin,
A full-color display element having a simple structure and excellent display quality can be manufactured.

[Brief description of the drawings]

FIG. 1 shows a structure of a fluorescent tube according to a first embodiment of the present invention and a full-color display element in which the fluorescent tube and a liquid crystal panel are combined.

FIG. 2 shows a driving voltage of a fluorescent display tube and a method of applying the driving voltage according to the first embodiment of the present invention.

FIG. 3 shows a structure of a fluorescent tube according to a second embodiment of the present invention and a full-color display element in which the fluorescent tube and a liquid crystal panel are combined.

FIG. 4 shows a driving voltage of a fluorescent display tube and a method of applying the driving voltage according to a second embodiment of the present invention.

FIG. 5 shows a structure of a fluorescent tube according to a third embodiment of the present invention and a full-color display element in which the fluorescent tube and a liquid crystal panel are combined.

FIG. 6 shows a structure of a fluorescent tube according to a fourth embodiment of the present invention and a full-color display element in which the fluorescent tube and a liquid crystal panel are combined.

FIG. 7 shows a model for an electric field analysis simulation of a fluorescent tube according to the embodiment of the present invention.

8 shows a result of an electric field analysis simulation of the model of FIG. 7;

FIG. 9 shows an arrangement of a large fluorescent light emitting tube in which a plurality of fluorescent light emitting tubes according to the embodiment of the present invention are juxtaposed.

FIG. 10 shows a structure of a conventional full-color liquid crystal display device in which a backlight unit of a reflector type and a liquid crystal panel are combined.

[Explanation of symbols]

11, 21, 31, 41, 61 First substrate of glass 12, 22, 32, 42, 62 Second substrate of glass 24, 44 Third substrate of glass 13, 23, 33, 43 Side plate of glass 214, 49 Support Members 15, 171 to 17n, 181 to 18n, 25, 27,
29, 210, 341-34n, 361-36n, 45
1 to 45n, 471 to 47n, 4011 shell 10n, 41
21 to 412n, 641 to 649, 651 to 659 Electrode 16, 181 to 18n, 26, 28, 211, 351
35n, 371-37n, 461-46n, 481-4
8n, 4111-411n, 4131-413n Phosphor 14, 212, 213, 38, 414, 415 Filament 51-54 Fluorescent arc tube

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H091 FA43Z GA02 LA11 LA15 5C094 AA06 AA10 AA13 AA44 AA45 BA33 BA43 CA19 CA24 DA13 EA04 EA07 EB02 FB12 FB20

Claims (10)

[Claims] A first substrate on which an electrode coated with a phosphor is formed, a second substrate on which an electrode coated with a phosphor is formed, and a filament provided between the first substrate and the second substrate;
When the electrode of the first substrate is an anode electrode, the electrode of the second substrate is a control electrode, and when the electrode of the second substrate is the anode electrode, the electrode of the first substrate is a control electrode. The electrode of one of the substrate and the second substrate is in a stripe shape, the electrode of the other substrate is in a solid shape, and the electrode of the one substrate has a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor. Two types of phosphors among the light emitting phosphors are alternately applied to each stripe-shaped electrode one by one, and the remaining one type of phosphor is applied to the solid electrode on the other substrate. Fluorescent tube. A first substrate on which an electrode coated with a phosphor is formed, a second substrate on which an electrode coated with a phosphor is formed, and a filament provided between the first substrate and the second substrate;
When the electrode of the first substrate is an anode electrode, the electrode of the second substrate is a control electrode, and when the electrode of the second substrate is the anode electrode, the electrode of the first substrate is a control electrode. The electrodes of the substrate and the electrodes of the second substrate are both stripe-shaped, and each of the electrodes on both substrates is provided with a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor, one for each stripe-shaped electrode. Fluorescent tubes applied sequentially. 3. The fluorescent light emitting tube according to claim 2, wherein the phosphors applied to the stripe-shaped electrodes of the first substrate and the opposing stripe-shaped electrodes of the second substrate have different emission colors. tube. A first substrate on which an electrode coated with a phosphor is formed; a second substrate on which an electrode coated with a phosphor is formed; and a filament provided between the first substrate and the second substrate.
When the electrode of the first substrate is an anode electrode, the electrode of the second substrate is a control electrode, and when the electrode of the second substrate is the anode electrode, the electrode of the first substrate is a control electrode. The electrode of the substrate and the electrode of the second substrate are both striped, and the electrode of one of the two substrates has two of phosphors for red light emission, green light emission, and blue light emission. A fluorescent light emitting tube in which one kind of phosphor is alternately applied to each stripe-shaped electrode, and the remaining one kind of phosphor is applied to the stripe-shaped electrode on the other substrate. 5. A first substrate having electrodes formed thereon, a second substrate having electrodes formed thereon, a third substrate located between the first substrate and the second substrate and having electrodes formed on both surfaces thereof, and a first substrate. And a filament provided between the third substrate and the third substrate, and a filament provided between the third substrate and the second substrate. When the electrode on the first substrate is an anode electrode, the electrode on one surface of the third substrate is When the electrode on one surface of the third substrate is an anode electrode, the electrode on the first substrate is a control electrode. When the electrode on the other surface of the third substrate is an anode electrode, the second substrate When the electrode of the second substrate is the control electrode and the electrode of the second substrate is the anode electrode, the electrode of the first substrate and the electrode of the second substrate are used in a fluorescent tube in which the electrode on the other surface of the third substrate is the control electrode. , And the electrodes on both sides of the third substrate are solid, and the first substrate, the second substrate, and the third substrate A phosphor is applied to electrodes on at least three of the four surfaces, and a red light-emitting phosphor, a green light-emitting phosphor, and a blue light-emitting phosphor are respectively applied to the electrodes of each substrate. A fluorescent luminous tube which is coated. 6. A first substrate having electrodes formed thereon, a second substrate having electrodes formed thereon, a third substrate located between the first substrate and the second substrate and having electrodes formed on both surfaces thereof, and a first substrate. And a filament provided between the third substrate and the third substrate, and a filament provided between the third substrate and the second substrate. When the electrode on the first substrate is an anode electrode, the electrode on one surface of the third substrate is When the electrode on one surface of the third substrate is an anode electrode, the electrode on the first substrate is a control electrode. When the electrode on the other surface of the third substrate is an anode electrode, the second substrate When the electrode of the second substrate is the control electrode and the electrode of the second substrate is the anode electrode, the electrode of the first substrate and the electrode of the second substrate are used in a fluorescent tube in which the electrode on the other surface of the third substrate is the control electrode. , And the electrodes on both surfaces of the third substrate are both striped,
At least three of the four surfaces of the substrate, the second substrate and the third substrate
A phosphor is applied to electrodes on one surface, and a phosphor for red light emission, a phosphor for green light emission, and a phosphor for blue light emission are applied to the electrodes of the respective substrates one by one. Fluorescent tube. 7. The fluorescent luminous tube according to claim 1, wherein, of the electrodes formed on the substrate, the electrode farthest from the light emitting surface of the fluorescent luminous tube is a metal. A fluorescent arc tube characterized by the above-mentioned. 8. The fluorescent light emitting tube according to claim 2, wherein a control voltage applied to the control electrode is different between a control electrode closest to the filament and a control electrode far from the filament. Fluorescent tube. 9. The fluorescent light emitting tube according to claim 1, wherein blinking of the fluorescent light emitting tube is controlled in a time-division manner. 10. The method of claim 1, 2, 3, 4, 5, 6, 7,
10. A full-color display element comprising the fluorescent luminous tube according to 8 or 9 and an optical shutter panel.