JPH03222253A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To improve brightness distribution around an electrode nd brightness uniformity of a display device by satisfying a specific relationship between the electrode length exposed to the discharge passages of the electrode and the depth of the discharge passage. CONSTITUTION:A hole 8 is independently provided at the bottom center of an airtight container mainframe 1 to allow discharge spaces 6a-6c, 7a-7c to communicate with the space of an electrode filament housing 4, and electrodes 14a-14c, 15a-15c are provided at the end which is further from the hole 8 in the electrode spaces 6a-6c, 7a-7c, to form discharge passage between an electrode filament 9 at the electrode filament housing 4 and the electrodes 14a-14c, 15a-15c and to form picture elements with fluorescent substance applied to the portions which are to be the respective discharge passages of the airtight container mainframe 1. The relationship 0.2<=L/H<=0.8 is satisfied, when L represents the electrode length exposed to the discharge passages of the electrode and H represents the depth of the discharge passage. It is thus possible to improve brightness distribution around the electrode and brightness uniformity of a display device.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a fluorescent lamp used as a light emitting element of a large color image display or device.

2. Description of the Related Art As a light emitting element having a plurality of picture elements used in a large color image display device, the applicant has previously proposed a fluorescent lamp as shown in FIG. In FIG. 3, the discharge space 6a
, 6b, and 6c form one picture element, and 7a, 7b, and 7c form another picture element, respectively.

Problems to be Solved by the Invention However, according to the inventor's study, in the configuration shown in FIG.
The emission brightness distribution between '15a', 15b', and 15c has the highest G brightness at the center, and the brightness decreases significantly as it approaches the electrode, making the brightness uniformity of the light emitting surface worse than that of a normal fluorescent lamp. showed a trend. It has been found that when the fluorescent lamp is actually incorporated into an image display device and turned on, alternating bands of light and dark brightness appear, causing a problem in image display.

The present invention has been made to solve these problems, and provides a fluorescent lamp that improves the brightness uniformity of an image display device by improving the brightness distribution of the light emitting surface of the fluorescent lamp.

Means for Solving the Problems In order to solve these problems, the fluorescent lamp of the present invention includes an airtight container body having a translucent front plate and an electrode filament storage integrated into the bottom of the airtight container body. A plurality of discharge spaces are formed by providing partition walls in the airtight container main body, and each discharge space and a space of the electrode filament storage part are formed in the center of the bottom surface of the airtight container main body. A plurality of holes are provided independently for communicating with each other, and an electrode is provided at the end of each discharge space far from the hole, and a plurality of forming a discharge path,
A plurality of picture elements are formed by coating a portion of the airtight container body that will become each discharge path, and the length of the electrode exposed to the discharge path is L (m), and the discharge path is It has a configuration that satisfies the relationship 0.2≦L/H≦0.8, where the depth of is H(-).

In order to examine how the size of the working electrode affects the luminance distribution of the light emitting surface, we fabricated fluorescent lamps in which the depth H of the discharge path and the length of the electrode exposed to the discharge path were varied. death,
The brightness and discharge sustaining voltage at that time were investigated.

As a result, when the electrode length was changed, the brightness improved as the electrode length became shorter, and when the electrode length became extremely short, the discharge sustaining voltage increased significantly. In this way, by making the electrode length satisfy 0.2≦L/H≦0.8, the brightness near the electrode can be improved without increasing the discharge sustaining voltage.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of a fluorescent lamp according to an embodiment of the present invention, and FIG. 2 is a front view of the same.

As shown in FIG. 1, the fluorescent lamp of the present invention includes a rectangular parallelepiped airtight container body 1 made of a ceramic container, and a front plate 2 made of a glass plate sealed with low-melting glass on the front surface of the container body 1.
, and an electrode filament housing section 4 consisting of a glass tube whose one end is sealed with low-melting glass and whose other end is sealed in a hole 3 made in the rear surface of the airtight container main body 1. . Inside the airtight container body 1, a partition wall 5 is integrally formed in a lattice shape, and six discharge spaces 6 are provided.
a, 6b, 6c, 7a, 7b, and 7c are formed.

As shown in FIG. 2, small holes 8 are independently provided in the center of the bottom of the airtight container body 1, that is, at one end of each discharge space, and these holes connect each discharge space to the other. It communicates with the space of the electrode filament storage section 4. In the vicinity of these holes, an electrode filament 9 on a coil provided in the electrode filament housing 4 is supported by two internal lead-in wires 10 and arranged. The two internal lead-in wires 10 are supported by a stem 11, and external lead-in wires 13 are connected to these, respectively. Note that 12 indicates an exhaust pipe. Further, electrodes 14a and 14 are provided at the ends far from the hole 8, that is, the other ends of these discharge spaces.
b, 14c.

15a, 15b, 15c are provided, the electrode filament 9 and the electrodes 14a, 14b, 14c, 15a.

A plurality of discharge paths are formed between 15b and 15c. Mercury and rare gases are sealed in an airtight container. Portions of the airtight container body 1 that become each discharge path, that is, discharge spaces 6a
, 6b, 6c, 7a, 7b.

7c is coated with phosphor.

Using a fluorescent lamp with the above configuration, the discharge path width W
The depth H of the discharge path is 3.5 mm, and the electrode diameter is 0.5 mm.
8m, and the electrode length is 3.4awa, 2.8m, 2
, Ova , 1 , 0 m , 0 , 7 m
, and 0.5 ms, the relative brightness (%) near the electrode with respect to the maximum brightness in the discharge path and the discharge sustaining voltage (V) are shown in the table below.

As can be seen from the above table, when L/H exceeds 0.8, the relative brightness becomes less than 55%, which actually causes a problem in the image display state. On the other hand, when L/HfJ was less than 40.2, the discharge sustaining voltage exceeded 39V and increased rapidly with respect to L/H. This increase in discharge sustaining voltage caused problems in circuit operation.

The same results as above were obtained when the depth H and width W of the discharge path were varied.

In other words, by setting the length of the electrode exposed from the bottom of the discharge space of the airtight container body within the range of 0.2≦L/H≦0.8, the brightness distribution near the electrode can be improved, and light emission can be improved. It can be seen that the brightness uniformity of the surface can be improved.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention forms an airtight container from an airtight container body having a translucent front plate and an electrode filament storage portion integrated into the bottom surface of the airtight container body, and A discharge space is formed in the main body, a hole is provided in the bottom of the airtight container for communicating the discharge space and the electrode filament housing, an electrode is provided in the discharge space, and the electrode is stored in the electrode filament housing. A discharge path is formed between the electrode filament and the electrode, and a plurality of picture elements are formed by coating a portion of the airtight container body that will become each discharge path, and the electrode is airtight. The electrode length L (w
a) When the depth of the discharge path is H (IIIll), by satisfying the relationship 0.2≦L/H≦0.8, it is possible to improve the luminance distribution on the light emitting surface, especially near the electrodes. This makes it possible to provide a fluorescent lamp with improved brightness uniformity when incorporated into an image display device.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a fluorescent lamp according to an embodiment of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is an exploded perspective view for explaining the previously proposed fluorescent lamp. 1... Airtight container body, 2... Front plate,
3... Hole, 4... Electrode filament storage section, 5... Partition wall, 6a, 6b, 6c, 7a,
7b, 7c---discharge space, 8---hole, 9
...... Electrode filament, 14a, 14b, 14
c, 15a, 15b, 15c...electrodes.

Claims (1)

[Scope of Claims] An airtight container is formed from an airtight container body having a translucent front plate and an electrode filament storage portion integrated into the bottom surface of the airtight container body, and a partition wall is provided in the airtight container body. thereby forming a plurality of discharge spaces, and independently providing a hole in the center of the bottom surface of the airtight container body for communicating each discharge space with the space of the electrode filament storage section,
An electrode is provided at the end of each discharge space far from the hole,
By forming a plurality of discharge paths between the electrode filament provided in the electrode filament storage portion and each of the electrodes, and applying a phosphor to a portion of the airtight container body that will become each discharge path, a plurality of discharge paths can be formed. When a picture element is formed and the length of the electrode exposed to the discharge path of the electrode is L (mm) and the depth of the discharge path is H (mm), 0.2≦L/H≦0.8 A fluorescent lamp characterized by satisfying the following relationship.