JPH0610620Y2 - Fluorescent lamp for display element - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fluorescent lamp mainly used for a display element of a large color display device or the like.

BACKGROUND ART As a light source for a color display, the applicant of the present application has proposed a fluorescent lamp integrated with a discharge space and having a structure as shown in FIG.

In such a lamp, the light source tube body 1 has an opening on one side, and the inside thereof is formed by a partition wall 1'which is integrally formed with, for example, three parallel discharge paths 2R, 2G, 2B. The inner wall surfaces forming the discharge paths 2R, 2G, and 2B are coated with phosphors (for example, red, green, and blue light-emitting phosphors) 3R, 3G, and 3B having different emission colors.

At one end of each discharge path 2R, 2G, 2B, an electrode insertion hole 5R for inserting an anode electrode 4R, 4G, 4B described later,
5G, 5B are provided, and discharge holes 7R, 7G, 7B communicating with the electrode chamber 6 are provided at the other end.

A translucent glass plate 8 is sealed on the opening surface which is the display surface of the light source tube 1, and a single glass stem 9 mounted on the outer bottom surface of the light source tube 1 is attached. An electrode chamber main body 11 in which a common cathode 10 and anode electrodes 4R, 4G, 4B spatially independent of the common cathode 10 are disposed inside, the anode electrodes 4R, 4G, 4B are connected to the electrode insertion holes 5R, It is sealed so as to be inserted into each of 5G and 5B.

A discharge gas is filled in an airtight space defined by the glass plate 8, the light source tube body 1 and the electrode chamber body 11. The airtight sealing of each of the above parts is performed by a glass frit 12 having a white color tone.

By the way, in a color display device configured by arranging a large number of lamps as described above, it is necessary to reduce the screen brightness level of black in order to increase the contrast of the display screen.
A black mask 13 is attached to the front surface of the glass plate 8. Therefore, there is a problem that the mask 13 is required as a component, the number of assembling steps is increased, and the cost is increased.

[Purpose of Invention] The present invention was made to solve the above problems.
It is an object of the present invention to provide a fluorescent lamp for a display element, which can improve the contrast of a display screen when used in a color display device, and can reduce the cost by reducing the number of parts and the assembly process. It is in.

DISCLOSURE OF THE INVENTION In general, the glass frit adversely affects the lamp characteristics if the binder remains after sealing. Therefore, glass frit is applied to the surface to be sealed, calcination is performed for each component, the binder is decomposed and removed, and then the components are assembled and fired to complete.

In order to check that no binder remains during calcination, the glass frit uses a white color tone.

Therefore, in the present invention, at least the glass plate 8 and the light source tube 1 are sealed by using the glass frit 12 'having a black color tone, which is conventionally attached to improve the contrast of the display screen. No mask is required, and the cost is reduced by reducing the number of parts and the assembly process.

Hereinafter, the present invention will be described based on embodiments.

(Embodiment 1) As shown in FIG. 1, in this embodiment, a translucent glass plate 8, a light source tube body 1 in which three parallel discharge holes 2R, 2G and 2B are formed, and a single light source tube body 1 are provided. It is a fluorescent lamp for a display element integrated with a discharge space formed by an electrode chamber body 11 having an upper surface opening in which a common cathode 10 is disposed.

In such a lamp, the glass plate 8 and the light source tube 1
Is sealed with a glass frit having a black color tone (for example, LS-0211B manufactured by Nippon Electric Glass Co., Ltd.) 12 ', so that the black color conventionally used for improving the contrast of the screen of the color display device is attached. No mask needed. The color tone of the glass frit is easily obtained by adding a pigment (for example, an oxide of iron or chromium).

Regarding the residual binder of the glass frit, the remaining sealing portion (for example, the outer bottom surface of the light source tube 1 and the electrode chamber body 11 are sealed, the anode electrodes 4R, 4G, 4B and the stem 9 and the electrode chamber body 11 are also sealed. White glass frit (for example, LS-0211B manufactured by Nippon Electric Glass Co., Ltd.)
It can be checked by using No. 12 and calcining at the same time.

Further, as shown in FIG. 2, the light emitted from the B part, which was hit by the mask 12 in the past (see FIG. 2 (a)), can be effectively used by using the glass frit 12 'having a black color tone. It has come to be used (see FIG. 2 (b)), and an improvement in brightness of about 6% was observed.

(Embodiment 2) As shown in FIG. 3, in this embodiment, in order to reduce the weight of the lamp body, the electrode chamber body 11 is formed of a glass bulb, and the inside of the light source tube body 1 is divided into four parts by partition walls 1 '. Space 2R, 2G,
2G and 2B are formed, and phosphors with different emission colors (for example, red, green, green, and blue-emitting phosphors) are formed on the inner wall surfaces thereof 3
This is a fluorescent lamp for a display element integrated with a discharge space and having a structure in which R, 3G, 3G, and 3B are applied.

In such a lamp, the glass plate 8 and the light source tube 1
Is sealed by using a glass frit having a black color tone, and the glass frit having a black color tone is applied to the side surface of the light source tube 1, so that the black level seen from the effective visual field can be improved.

Since other configurations are the same as those in the first embodiment, the description will be omitted by giving the same reference numerals to the same configurations.

[Advantages of the Invention] As described above, the present invention forms a plurality of discharge paths by the barrier ribs and applies fluorescent substances of different emission colors to the inner wall surface forming each discharge path. A light source tube body having a single-sided opening, in which independent anode electrodes are respectively provided and independent discharge holes are provided at the other end, and the opening surface is covered with a translucent plate to face each of the discharge holes. In a fluorescent lamp for a display element, which is formed by discharging between a common cathode and each of the anode electrodes provided as described above, at least the plate and the light source tube are sealed by using a glass frit with a black color tone. Therefore, when the fluorescent lamp for a display device according to the present invention is used in a color display device, the black mask conventionally attached for improving the contrast of the display screen is not needed. As a result, the number of parts can be reduced, the assembly process can be shortened, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 shows Example 1 of the present invention. (A) is a plan view, (b) is a sectional view taken along line AA of the same, and FIG. 2 is a schematic diagram for explaining a light emitting state. (a) is related to the conventional example, (b)
Shows the case according to the embodiment. FIG. 3 shows a second embodiment of the present invention.
(A) is a plan view, (b) is a sectional view taken along the line A-A of the above, FIG. 4 shows a conventional example, (a) is a plan view, and (b) is the same as A of the above. FIG. 1 ... Light source tube, 1 '... Partition, 2 ... Discharge path, 3 ...
Fluorescent substance, 4 ... Anode electrode, 7 ... Discharge hole, 8 ... Translucent plate, 10 ... Common cathode, 12 '... Glass frit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichi Morii 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References JP-A-61-22553 (JP, A) JP, U)

Claims (1)

[Scope of utility model registration request] 1. A plurality of discharge paths are formed by partition walls, and fluorescent materials of different emission colors are applied to the inner wall surface forming each discharge path, and an independent anode electrode is provided at one end of each discharge path. And a common cathode provided so as to face each of the discharge holes, by covering the opening surface of a light source tube body having a single opening with independent discharge holes at the other end In a fluorescent lamp for a display element which is caused to discharge between each anode electrode, a display element characterized by using a glass frit having a black color tone for at least sealing the plate and the light source tube. Fluorescent lamp.