JPH0590802U - Fluorescent lamp for display element - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the temperature characteristics in the low ambient temperature range. A light source tube body 10 having a light emitting chamber 1 having a transparent glass plate 30 sealed on an upper surface thereof and a phosphor coated on an inner surface thereof, and a discharge space communicating with the light emitting chamber 1 are formed. An electrode chamber 20 hermetically sealed on the lower surface of the light source tube body 10, an anode 3 arranged in the light emitting chamber 1, a common cathode 22 arranged in the electrode chamber 20, and a front surface of the light source tube body 10 are provided. Box 5 to cover
0, at least the bottom surface of the box body 50 is made of a translucent material, and the bottom surface of the box body 50 and the glass plate 30.
There is a gap formed between and to form an air layer.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a fluorescent lamp for a display element that forms pixels in a large color display device installed in an outdoor stadium or the like.

[0002]

[Prior Art]

 As a fluorescent lamp for a display element forming a pixel of a large color display device, as shown in FIG. 4, a plurality of light emitting chambers 1R, 1G, 1B, 1G forming one pixel are connected to each other to form one discharge space. A structure in which the common cathode 22 is formed and provided in the discharge space has been put into practical use.

This fluorescent lamp is provided with a light source tube body 10, and the inner space of the light source tube body 10 is partitioned by a partition wall 11, and, for example, four light emitting chambers 1R, 1G, 1B, 1G are formed. A long discharge path is formed by the partition plate 12 in each of the light emitting chambers 1R, 1G, 1B and 1G. The inner surface of each of the light emitting chambers 1R, 1G, 1B and 1G is coated with a phosphor that emits different light emission colors, for example, 1R is red, 1G is green and 1B is blue.

Further, in each of the light emitting chambers 1R, 1G, 1B, 1G, a communication hole 2R, 2G, 2B, 2G is formed in one place near the center of the light source tube 10, and in other places, respectively. Anodes 3R, 3G, 3B and 3G are arranged.

The light source tube 10 is made of a non-translucent material such as ceramics having a relatively high reflectance for visible light, and a transparent glass plate 30 is sealed on the upper surface (display surface) thereof. It is worn. Further, a glass bulb 20 as an electrode chamber is sealed on the lower surface of the light source tube 10 so as to cover the communication holes 2R, 2G, 2B, 2G, and the glass bulb 20 is commonly held by a stem 21. A cathode 22 is provided. The above-mentioned components are hermetically sealed by glass frit. The glass bulb 20 is covered with a base 40.

As described above, the internal space defined by the light source tube body 10, the glass plate 30, and the glass bulb 20 communicates with each other through the communication holes 2R, 2G, 2B, 2G to form an airtight discharge space. Since it is formed, a discharge gas composed of an inert gas such as argon and mercury is enclosed in the discharge space.

In the fluorescent lamp having such a configuration, when the desired anodes 3R, 3G, 3B, 3G and the common cathode 22 are discharged, the anodes 3R, 3G, 3B, 3G involved in the discharge are dealt with. The light emitting chambers 1R, 1G, 1B, 1G that emit light emit light to emit a desired color.

[0008]

[Problems to be solved by the device]

 By the way, since the fluorescent lamp for a display element is a fluorescent lamp using mercury as a discharge medium, it has an ambient temperature characteristic as is well known.

When a large number of these fluorescent lamps for display elements are arranged in a matrix as a unit pixel and a large color display device is installed outdoors, the coldest point of the lamp is the coldest place or the winter when the ambient temperature is low. There was a problem that the mercury vapor pressure, which is determined by the temperature, became low, and the screen brightness dropped significantly.

Further, since there is a temperature difference between the upper part and the lower part of the screen as a whole, there is uneven brightness on the screen (high brightness near the upper part of the screen due to high temperature, and low brightness near the lower part of the screen due to low temperature). There is also a problem that occurs.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a fluorescent lamp for a display element, which can improve temperature characteristics in a low ambient temperature region.

[0012]

Means for Solving the Problems To solve the above problems, the present invention provides a light source having a plurality of light emitting chambers, each of which has a transparent glass plate sealed on its upper surface and a phosphor on its inner surface. The tube body, an electrode chamber hermetically sealed on the lower surface of the light source tube body so as to form a discharge space communicating with each light emitting chamber, a plurality of anodes arranged in each light emitting chamber, and an electrode chamber arranged in the electrode chamber. A common cathode provided, and a discharge gas is enclosed in the discharge space, and a discharge is generated when a voltage for generating a discharge is applied between the desired anode and the common cathode. In a fluorescent lamp for a display device in which a phosphor in a light emitting chamber in which an anode is disposed emits light, at least the bottom surface of the light source tube body is covered with a box body having a one-sided opening made of a translucent material, and Provide a gap between the bottom of the box and the glass plate It is characterized in.

[0013]

【Example】

 FIG. 1 shows an embodiment of the present invention. The difference from the conventional example is that the front surface of the light source tube 10 is covered with a box 50 having a one-sided opening formed of a translucent acrylic resin. In addition, since a gap is provided between the bottom surface of the box body 50 and the glass plate 30, other configurations are the same as those of the conventional example, and therefore, the description is omitted by giving the same reference numerals to the same configurations. In this embodiment, a printing color filter 60 made of a heat resistant organic film is attached to the bottom surface of the box body 50, that is, the display surface.

With such a configuration, an air layer is formed between the light source tube 10 and the bottom surface of the box body 50, so that a heat retaining effect is exerted when turned on, and as shown in FIG. The temperature characteristics in the temperature range are improved. In the figure, the solid line shows the characteristics of the present invention, and the broken line shows the characteristics of the conventional example.

Furthermore, since the ambient temperature characteristic shifts to the low temperature side, the brightness difference due to the temperature difference between the upper and lower parts of the screen also works to be alleviated, and the brightness unevenness is improved to a level where there is no practical problem. It was

Further, in this embodiment, since the color filter 60 is attached to the bottom surface of the box body 50, the surface temperature of the color filter 60 can be lowered as compared with the conventional example in which the color filter 60 is attached directly to the glass plate 30. The life span has been doubled.

FIG. 3 shows a different embodiment of the present invention. The difference from the above-mentioned embodiment is that the box 50 is made of a black frame 52 made of a molding material such as PBT and a translucent plate glass 51. In addition to that, the printing color filter 60 made of a heat resistant organic film is attached to the surface of the plate glass 51. The plate glass 51 is fitted and adhered to the frame body 52.

In the present embodiment as well, similar to the previous embodiments, it is possible to improve the brightness in the low ambient temperature region due to the heat retention effect, improve the brightness unevenness of the screen, and extend the life of the color filter. Since the body 52 was black, light leakage between the elements was absorbed, and the contrast of the screen was improved by about 25%.

[0019]

[Effect of the device]

 As described above, the present invention covers the front surface of the light source tube body with a box body having at least a bottom surface made of a translucent material and having a single opening, and a gap is provided between the bottom surface of the box body and the glass plate. As a result, an air layer is formed between the light source tube and the bottom of the box, so the heat retention effect works when turned on, and a fluorescent lamp for display elements with improved temperature characteristics in the low ambient temperature range is provided. Can be provided.

Further, since the ambient temperature characteristic shifts to the low temperature side, when the fluorescent lamp according to the present invention is used as a pixel in a large-sized color display device or the like, the difference in brightness due to the temperature difference between the upper and lower parts of the screen is reduced. The uneven brightness is improved to a level where there is no practical problem.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention.

FIG. 2 is an ambient temperature characteristic diagram of a fluorescent lamp for a display device according to the present invention.

FIG. 3 is a partial sectional front view showing a different embodiment of the present invention.

FIG. 4 shows a conventional example, in which (a) is a plan view and (b) is a plan view.
FIG. 4 is a front view of a partial cross section. 1 Light Emitting Chamber 2 Communication Hole 3 Anode 10 Light Source Tube 20 Electrode Chamber 22 Common Cathode 30 Glass Plate 50 Box

Claims (1)

[Scope of utility model registration request] 1. A light source tube body having a plurality of light emitting chambers, each of which has a light-transmitting glass plate sealed on an upper surface thereof, and a phosphor coated on an inner surface thereof, and a discharge space communicating with each light emitting chamber. An electrode chamber that is hermetically sealed to the lower surface of the light source tube,
It comprises a plurality of anodes respectively arranged in the respective light emitting chambers, and a single common cathode arranged in the electrode chamber, and a discharge gas is enclosed in the discharge space to form a desired anode and common cathode. In a fluorescent lamp for a display element in which a fluorescent substance in a light-emitting chamber in which an anode causing a discharge is disposed emits light when a voltage causing a discharge is applied between the light source tube body and at least the bottom surface. A fluorescent lamp for a display element, which is covered with a box body made of a translucent material and having one surface opening, and a gap is provided between the bottom surface of the box body and the glass plate.