KR200255823Y1 - Lamp - Google Patents

Abstract

The present invention relates to a lamp that can improve the brightness.

The lamp according to the present invention is a discharge tube injecting inert gas for discharge and the phosphor is applied to the inner wall, cylindrical electrodes installed on both sides of the discharge tube to supply the voltage for discharge, electrode rods installed inside the cylindrical electrode or And an inner cylindrical electrode.

By such a configuration, since the discharge area is increased, the luminance can be improved.

Description

Lamp {Lamp}

The present invention relates to a lamp, and more particularly to a lamp that can improve the brightness.

Typically, a liquid crystal display (LCD) is a plurality of liquid crystal cells arranged in a matrix form and a plurality of control switches for switching a video signal to be supplied to each of these liquid crystal cells. The amount of light transmitted from the backlight unit is adjusted by the configured liquid crystal panel to display a desired image on the screen.

Referring to FIG. 1, a conventional backlight unit includes a lamp 1 for generating light, a lamp housing 3 installed to surround the lamp 1, and light incident from the lamp 1 as a planar light source. The light guide plate 5 to be converted, the reflector 7 positioned below the light guide plate 5 to reflect the light traveling toward the lower surface and the side surface of the light guide plate 5 toward the upper surface, and light passing through the light guide plate 5 are diffused. The first and second prism sheets 11 and 13 and the prism sheets 11 and 13 for adjusting the advancing direction of light via the first diffusion sheet 9 and the first diffusion sheet 9 A second diffusion sheet 15 for diffusing light is provided.

A cold cathode fluorescent lamp is mainly used as the lamp 1, and the light generated by the lamp 1 is incident on the light guide plate 5 through an incident surface existing on the side of the light guide plate 5. The lamp housing 3 has a reflecting surface on its inner surface to reflect light from the lamp 1 toward the incident surface of the light guide plate 5. The light guide plate 5 is manufactured in a form having an inclined rear surface and a horizontal front surface. The rear side of the light guide plate 5 is provided so that the reflecting plate 7 faces. The reflector 7 serves to reduce light loss by reflecting light incident to itself through the back of the light guide plate 5 toward the light guide plate 5. When the light from the lamp 1 is incident on the light guide plate 5, the light is reflected at a predetermined inclination angle from the rear surface of the inclined surface and is uniformly directed toward the front surface. At this time, the light propagated toward the lower surface and the side surface of the light guide plate 5 is reflected by the reflecting plate 7 and proceeds toward the front side. Light passing through the light guide plate 5 is diffused to the entire area by the first diffusion sheet 9. On the other hand, the light incident on the liquid crystal panel (not shown) increases the light efficiency when it is vertical. To this end, it is preferable to stack two forward prism sheets so that the traveling angle of the light emitted from the light guide plate 5 is perpendicular to the liquid crystal panel. Light passing through the first and second prism sheets 11 and 13 is incident on the liquid crystal panel via the second diffusion sheet 15.

Referring to FIG. 2, the cold cathode fluorescent lamp includes a discharge tube 17, inert gases 19 injected into the discharge tube 17, negative electrodes 21 provided at both ends of the discharge tube 17, and It consists of an anode which is not shown in figure, and the fluorescent substance 23 apply | coated on the surface of the inner wall of the glass tube 17. As shown in FIG.

The inert gases 19 injected into the cylindrical discharge tube 17 are mixed in a ratio of neon (Ne) and argon (Ar) and contain a small amount of mercury (Hg).

The electrode 21 has a cylindrical structure as shown in FIG. 3. When the voltage is supplied to the electrode 21, the electron 25 is protruded from the electrode 21 and collides with the inert gases 19 inside the discharge tube 17, so that the electron 25 is increased exponentially. Current flows through these electrons 25, and the inert gas 19 is excited by the electrons 25 from the electrode 21, and ultraviolet rays are emitted as radiant energy, which is the inner wall of the discharge tube 17. It collides with the phosphor 23 applied to the film to emit visible light.

Such a lamp can be ultra-fine as a light source of a backlight unit, and has an advantage of long life and low power consumption. Thereby, thickness reduction and weight reduction of a backlight unit can be achieved. However, the amount of discharge gas in the discharge tube of the lamp can be increased to improve the luminous efficiency, but this is limited because it is made in a certain space. In addition, since the internal area of the lamp is constant, the amount of phosphor applied is constant, and the amount of housekeeping light emitted is constant, thereby increasing the luminance. Therefore, there is an urgent need for a new method for increasing luminance.

Accordingly, it is an object of the present invention to provide a lamp that can improve the brightness.

1 is a cross-sectional view showing a conventional backlight unit.

2 is a cross-sectional view showing the lamp shown in FIG.

3 is a cross-sectional view showing the electrode of the lamp shown in FIG.

4 is a cross-sectional view showing a backlight unit according to an embodiment of the present invention.

5 is a cross-sectional view showing the lamp shown in FIG.

<Description of Symbols for Main Parts of Drawings>

1, 31, 51: lamp 3, 33: lamp housing

5, 35: LGP 7, 37: Reflector

9, 15, 39, 45: diffusion sheet 11, 13, 41, 43: prism sheet

17 glass tube 19 inert gas

21: cathode 23, 53: phosphor

25: electronic

In order to achieve the above object, the lamp according to the present invention is a discharge tube in which inert gas for discharge is injected and the phosphor is coated on the inner wall, cylindrical electrodes installed on both sides of the discharge tube to supply a voltage for discharge, and the cylindrical It is characterized in that it comprises an electrode rod or an inner cylindrical electrode installed inside the electrode.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

4 and 5 will be described a preferred embodiment of the present invention.

Referring to FIG. 4, the lamp 31 according to the embodiment of the present invention includes an electrode rod 41A or an inner cylindrical electrode inside the cylindrical electrode 41.

The lamp 31 is mainly used a cold cathode fluorescent lamp and serves to generate light.

The principle of generating such light is as follows.

The lamp 31 includes a discharge tube 37, inert gases 39 injected into the discharge tube 37, negative electrodes 41 provided at both ends of the discharge tube 37, and an anode not shown; It consists of the fluorescent substance 43 apply | coated to the inner wall surface of the discharge tube 37. As shown in FIG.

The inert gases 39 injected into the cylindrical discharge tube 37 are mixed in a ratio of neon (Ne) and argon (Ar) and contain a small amount of mercury (Hg).

As shown in FIG. 5, an electrode rod is installed inside the cylindrical electrode 41 or an inner cylindrical electrode 41A is installed. As a result, the area of electron emission of the electrode 41 increases. When the voltage is supplied to the electrode 41, the electrons 45 protrude from the electrode 41 and collide with the inert gases 39 inside the discharge tube 37 to increase the electrons 45 exponentially. The current is transmitted by these electrons 45, and the inert gas 39 is excited by the electrons 45 from the electrode 41, and ultraviolet rays are emitted as radiant energy, which is the inner wall of the discharge tube 37. It collides with the phosphor 43 coated on and emits visible light.

As the area of the electrode 41 increases, the amount of electrons 45 emitted from the electrode 41 increases. As a result, the number of collisions with the inert gases 39 existing in the discharge tube 37 increases, thereby increasing the amount of ultraviolet rays emitted. Therefore, since the amount of ultraviolet rays colliding with the phosphor 43 is increased, the amount of visible light emitted to the outside is increased. As a result, the amount of light generated by the lamp 31 is increased, so that the brightness is increased. In other words, as the area of the electrode 41 constituting the lamp 31 increases, the light emitting area increases, thereby improving luminance.

As described above, the lamp according to the present invention can improve the brightness by increasing the area of the electrode for emitting electrons.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the utility model registration claims.

Claims (1)

A discharge tube 37 in which inert gases 39 for discharge are injected and phosphors 43 are applied to the inner wall, Cylindrical electrodes 41 installed at both sides of the discharge tube 37 to supply a voltage for the discharge; Lamp having an electrode or an inner cylindrical electrode (41A) is installed in the cylindrical electrode (41).