JPS61151962A - Flat light source - Google Patents

Abstract

PURPOSE:To improve and uniform the luminance of a phosphor face by making a structure that an insulator sheet is attached closely on the upper face of a protective layer. CONSTITUTION:An insulator sheet 28 is attached closely on a protective layer 19 and the boundary parts around electrodes are protected from direct ion bombardment by the insulator sheet of 1mm or less in thickness having through- holes 29 of 10% or less of the protective layer 19 corresponding to the electrodes 1811-18mn. Furthermore, the upper face of said insulator sheet 28 is provided with a reflective coating 31 of 1mm or less in thickness capable of reflecting ultraviolet ray of 60nm-360nm, for example, an aluminum vapor deposited coating of 20mum in thickness. Also, on the inner flat face of a flat plate 22 is coated phosphor 20 excited by ultraviolet ray.

Description

[Detailed Description of the Invention] [Fields of Medical Use] Nine examples of this invention include the rear light source of a transmission type enemy crystal display device, the pixels of a large 11!
*Regarding flat light sources used in fields where thin flat plates are required, such as light sources and nine sources for general lighting.

[Conventional technology]

For example, a quasi-crystal display device is an application of the nine-switch function of a liquid crystal that undergoes a phase transition due to the effects of electric fields and thermodynamics, and has a polarity T-boss.

There are two types: a reflective type that receives light from the liquid crystal display surface and reflects it at the back to create a pattern on the surface, and a transmissive type that allows light to enter and pass through from behind the liquid crystal to create a pattern on the display. Although the Manshiki has been put into practical use, since the liquid crystal does not emit light when the original switch is turned on, a light source is essential to achieve a bright surface pattern. Transmissive type devices are also used as office automation terminals, and at present, a -ye type transmissive color liquid crystal display device as shown in FIG. 2 is used.

2 in FIG. 2, (1) is a liquid crystal display unit, which includes a first liquid crystal-filled vacuum container (2) and this first liquid-crystal-filled vacuum container (2).
), a first transparent 11L layer (3), a first product alignment film (4) provided so as to cover this first transparent electrode, and a first liquid crystal. Enclosed vacuum container (
2) and the second 1111-enclosed Meiku Hiragiki (5 (and.

A plurality of second transparent electrodes (6a), (
6b).

(6C) ,... and the second transparent electrode (6S, (6
colored layers (7a), (7b), C70) formed on the upper surfaces of ilt, (60),..., respectively.
・And the second transparent electrode (6a), C6b), (
60), ・Gyohi colored layer (7a), (71)),
C70) The liquid crystal (9) sealed between the 11th and 2nd crystalline alignment films (8) and the 12th and 2nd liquid crystal sealed vacuum vessels (2) and (5). )and.

A first polarized light &(IG) and a #J2 liquid crystal sealed vacuum vessel (
5) and a second polarizing plate αυ disposed on the outer surface side. tL2 is a straight tube-shaped fluorescent lamp that serves as a rear light source and is disposed behind the liquid crystal display section (1), that is, on the side of the second polarizing plate aD. Multiple bodies are arranged in parallel. (13 is a dispersion board that is placed in the darkness of the jkft, lamp 112 and liquid crystal display @ (1), and makes nine bundles and seven uniforms from the fluorescent pumping mackerel of the value number.

2. A transmissive color liquid crystal display device having the above configuration.

While the fluorescent lamp u2 is turned on, the transparent electrode (3) of wJl and the second transparent cage m (6a), (61)), (6C),
=...Apply a potential between.

Here, an example is that a potential is generated between the transparent electrode (3) of 5141 and the second transparent electrode (6b), and the first transparent electrode (3) and the second transparent electrode (6b). If a potential is generated between the transparent electrodes 13+, (6li), the dark liquid crystal molecules (9a) remain in the molecular crystal structure that does not transmit the original, 69, and the transparent 'lEa+31.C6b) 閤(7
) Liquid crystal molecule C9b) Has a molecular crystal structure that allows n9 to pass through. the result.

Light is not originally emitted from the part facing the second transparent electrode (6a), but light corresponding to the color of the colored layer (7b) is emitted from the fc ground part facing the second transparent electrode (6b). By doing so, a desired display pattern can be obtained.

However, in the above device, since the 9It element lamps υ are arranged in a number of pieces according to the display area, uneven brightness is likely to occur on the 1 element diffusion slope 0. Possible ways to prevent this uneven brightness include increasing the distance between the fluorescent lamp u2 and the original diffuser plate 3, or increasing the number of JIIt original lamps to increase the arrangement density.

However, in the former method, the device itself becomes thick (particularly in the thickness direction), and one of the advantages of using the liquid crystal display section +ll'i as the i&

In addition, in the latter method, the per-unit power consumption using the fluorescent lamp t12 as a source increases, and one advantage of using the liquid crystal display section (1) is that it has a low dissipation storm force. Not only is the scale useless, but the efficiency of the fluorescent lamp α2 is poor due to the temperature rise of Jiuyuanzheng.
) and the light diffusing plate 3 deteriorated. I found it necessary to prepare Ji&9 lamps (12) according to the size of the case and the size of the display.

In addition, in the above conventional example, a normal LK9 clamp was used as the 9-clamp, but in order to maintain the lifespan of a TV as a FT source, a fluorescent lamp using a claw discharge using cold cathode sound was used as a transmission type. A device used as a rear power source for a liquid crystal display*tii has also been proposed*. Shikuru.

In a fluorescent lamp using such tallow discharge, the distance between the electrodes increases as the display surface expands, causing the starting voltage to rise and causing trouble in starting or restarting the discharge. The ignition voltage also increases and causes noise to the LCD drive Wm circuit, causing malfunction of the display tube.9.OA
The display was not the same as the large transmissive liquid crystal display devices such as Gusong.

Therefore, it has been desired to develop a light source that has a uniform bright side surface and discharges at a low starting voltage as a rear power source for a liquid crystal display device. It is thought that it is a blood discharge type backward party.It is 8 in the figure and +14
It is a discharge vessel made of a glass plate with mercury 1171 and a rare gas sealed inside.

A first container, a second container Vθ, and a second container Vθ, each of which is made of flanges to provide resistance to each other.

Each container a and αe have a pair of opposing inner planes (15a)
, (16a). (1811) ~ (18m
n) are m rows n on one inner plane (16&) of the discharge vessel I.
Multiple electrodes arranged in a matrix of rows, each electrode (
1811) to (18mn) are respectively protective layers (1911
) to (19 mn). ■ is the discharge vessel (I4
It is painted on the inner surface of 1 except for polarization (1811) to (18mn)';

Protective layer (1911) - (1911In) - Electrode (181
1) to (18 mn), each electrode (1811
) to (18 mn) to cause discharge, and the phosphor (2) 1! :l! Light emission is performed by starting i71, and a thin flat light source having a uniform brightness surface can be obtained with a low starting voltage.

[Problem that the invention seeks to solve]

However, in the above-mentioned flat plate light source, the discharge time is 1W.
Electric field concentration tends to occur at the boundary around the L pole, and the W pole protective layer and insulating layer are sputtered, making it impossible to stabilize and emit secondary electrons, resulting in a short lifespan in which the discharge becomes unstable and eventually stops lighting up. A problem arises. In addition, there is a problem that the intensity of i3 on the surface of the phosphor is not sufficient (also, depending on the shape of the discharge, there is an intensity distribution of ultraviolet light, and there is some brightness phase separation on the surface of the phosphor). There was a point.

This invention was made in order to solve the above-mentioned problems, and has a long lifespan that can prevent sputtering of the electrode protective layer and insulating layer, and simultaneously improve and uniformize the brightness of the gk element. S-type II [l flat plate-shaped ft of discharge area, source t-
The purpose is to provide.

[Means for Solving the Problem] In the present invention, a protective layer is provided on the upper surface of a matrix-like electrode at a position corresponding to the above-mentioned ratio.

In addition, an insulating sheet 7 having a through hole whose upper surface is 10% or less of the size of the protective layer and whose upper surface reflects ultraviolet St is formed into an insulating sheet 7 which is closely spaced on the upper surface of the protective layer.

[Effect]

The insulating sheet prevents electric field concentration that tends to occur at the surrounding boundary, prevents sputtering of the protective layer and insulating layer, extends life, and protects against ultraviolet light generated by discharge because it reflects , uniform intensity of ultraviolet light on the phosphor surface on the opposite side of the electrode? fMt-radiation, it is possible to make the device on the phosphor surface uniform, and it is also possible to realize a high j4 [i] of the flat light source.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

In Figure 1, +211 is a planar discharge vessel that is open on both sides and radiates one element with a wall ridge and a flat plate mouth made of glass that closes the opening in this region, and the side wall (
It is formed by a flat plate (c) made of glass or ceramics that closes one opening surface of (c). (1811)
~(18mn) is a plurality of electrodes arranged in a matrix of m rows and n columns on the flat plate Ω, and the distance between each electrode is 2.
A yoke enclosure of 0 to 100 inches, in this example it is 50U,
The aluminum plate having a thickness of 2 to 10 mm is formed by depositing or applying a thick film of other four-electrode metals, and a discharge is formed between the two electrodes during nine-time division drive. This electrode (
1811) to (18 mm) with a thickness of 0.1 to 1100 AL to uniformly accumulate charges and speed up the response characteristics of discharge application pulses.
In a t-body film, for example, Ta205 e 5i02 is II(i3N4.α[ is K on this dielectric film)
MgO, cao2, cao6 or (Sr,
ca).

A protective layer (made of an inorganic oxide) with a thickness of 10 to 800 mm is placed on top of this protective layer 0, and the electrode (18
11) - (18 requests), this protection #! The I1 layer (an insulator sheet with a thickness of 1 or less and having through holes of 10% or less of 9) protects the electrode 1 boundary from direct ion bombardment.Furthermore, this insulator sheet On the upper surface of (to), there is a reflective film Cυ1 with a film thickness of 1 mm or less that can reflect ordinary radiation from 60 Um to 360 nm, for example, A with a thickness of 20 μm.
J A black stagnation membrane is provided. 4 is a phosphor coated on the inner surface of the flat plate (2) and is excited by fC and outer vein Q (highly excited).

The firefly (c) and the flat plates (2) and (2) are sealed by a crow frit, and the thermal expansion coefficient of the crow frit is Those with a difference of 20% or less are used. Insulator sheet (
To) is also the same <, 9111 wall (c) and flat plate, (c)
A material with a heat engraving rate of 20% or less is used.

@ is used to evacuate the inside of the flat discharge vessel QIl.

This is an exhaust pipe for sealing mercury or rare gas inside.

The above-mentioned phosphor (3) has a colored layer (7, (7b) shown in Fig. 2 to enable color display).

(7C) Spectroscopy: Based on the nine primary colors combined with each other (ultraviolet excitation type, three-wavelength range emission type fluorescent light source)
゜i41 range of 445 nm or more and 475 nm or less, 525
A second range of not less than nm and not more than 555 nm, j6 yo 595n
The radiation is mainly emitted in the third range from m to 625 nm.

45 for radiation energy in the range of 380 nm or more and yaonm or less, where the sum of the radiant energies of these three yokes is 380 nm or more and yaonm or less.
% or more.

For example, 30wt% Y2O2: Fliu! +lR
Original and 49 wt% LaPO4: Oe5+, Tb3
+ lightning and 21% by weight (err Ba)9 (PO4
) 6BrO12: Comprised of a Eu2+ electroluminescent substance with a thickness of 100 μm or less, an example is a 60-coated one.

Further, inside the flat discharge vessel 311, there is a mixture of dry water wax capable of maintaining a saturated fish pressure of 5 m9 or more and a diluted scum in the range of 1 to several 10 Torr, or 1 to several 100 Torr that does not contain wax.
Torr *For example, 50 Torr of mixed dilute scum mainly composed of helium and cannon is sealed, and in this example, rL10#y wax and mixed cloth scum of 20 Torr mainly composed of Archon and neon are sealed. There is.

2. Place it in the flat light source that has been designed as described above.

Each electrode (1811) to (I Brrm) rings so that time-division driving is performed sequentially for 200 million hours. 2 circuits (diagram shows 7 circuits)
The 21E poles connected to the
A time-sharing discharge will be carried out in the darkness. Then, this selected 2 @ is moved sequentially, and 7i! Turtle t.

When the discharge of ``I &End''llE is predominant, the friend returns to the first electric darkness, and #I returns. By the way, this 2-
If the discharge exceeds 10 o mAy, the deterioration of the NL pole (1811) to (18 mn) will progress and it will be difficult for the #house as a single source to maintain 10,000 hours, so turn it 10 degrees. Is it necessary to do the following?Also,
Set period of discharge (for example, electrode (1811), (18
12) Starting from the discharge of bx pole (18mn-1) e
(18 mn) of discharge is just one step away. ) is 30h
If it is less than O, you will notice flicker of light.
30111z or higher is required because A-type optical display terminals may cause eye irritation when used for long periods of time.

The ultraviolet radiation generated by the time-division discharge of the 2iE darkness arranged in the matrix above excites the fluorescent light, which emits light to the outside of the 11L valley device (21+ local flat plate). is irradiated with a uniform brightness t.Furthermore, since the loquat edge sheet @ reflects ultraviolet light, the intensity of the fibers applied to the local flat plate, which is radiated to the body four, is becomes even more uniform, and the original position irradiated outward from Hei 4L becomes evenly uniform, and even becomes island-bound.

In addition, there are some stains on the upper sheet! 11. No concentrated electric field is generated at the boundary.

〔Effect of the invention〕

As described above, in the present invention, a protective layer is coated on one of the ten curves of a pair of flat discharge vessels facing each other, and a plurality of electrodes arranged in a matrix are coated with a protective layer. On the top, through holes of 10% or less of the above protective layer are provided at positions corresponding to each X billion, and an Ie edge sheet whose top surface reflects ultraviolet light is densely layered on the top surface of the above protective layer. Is it above because the electric light substance is applied to the doshien? 3. The anti-irradiation sheet prevents spatter of the electrode protective layer and insulating layer due to the concentration of the periphery of the surrounding area, thereby extending the life of the electrode.Furthermore, by reflecting ultraviolet rays, By emitting strong ultraviolet rays uniformly all around the phosphor, it is possible to reduce the radiance between the phosphors and improve brightness.

[Brief explanation of the drawing]

Figure 1 shows -! of this invention. 51! Figure 2 is a vertical view showing the transmissive color liquid crystal display equipment, Figure 3 is a flat plate-like view of the rice plate. Figure 5 is the original moth town map, and Figure 4 is a partial plan of its '1 Kyokuto. Mark in the figure - kMF (1811) ~ (18mn) ri”
tl and others, α3 is a protective layer. ■ is a firefly Motokon, QD is a planar plate-shaped Kamegani, @, Ω is a half plate. (c) is the side wall, @ is the exhaust pipe, (to) is the insulating sheet, the wire is the through hole, ■ is the dielectric layer, 0υ is the ultraviolet taste reflective film. The same symbols in the figure are the same, and fC indicates the corresponding part. .

Claims (3)

[Claims] (1) A flat discharge vessel that has a pair of opposing inner planes and is filled with rare gas or rare gas and mercury; A protective layer coated with a plurality of electrodes arranged in a matrix, with a through hole at a position corresponding to each electrode and having a size of 10% or less of the protective layer, and having a thickness of 1 mm to reflect ultraviolet rays. A flat light beam made of an insulating material having the following reflective film, comprising an insulating sheet closely adhered to the upper surface of the protective layer, and a phosphor coated on the inner surface of the discharge vessel. . (2) Claim 1, characterized in that the insulating sheet has a thickness of 1 mm or less and is made of glass or ceramic material with a thermal expansion coefficient difference of no more than 20% from the discharge vessel. The flat light source described. (3) The electrodes are made of a conductor with a distance between each electrode in the range of 1 to 100 mm and a discharge current of 1 to 100 mA. The flat light source described in Section 1.