KR20060122115A - Optical source lamp with brightness activation uniformity - Google Patents

Abstract

A light source lamp is provided to make the discharge efficiency of respective discharge spaces uniform, thereby improving the uniformity of brightness, by forming respective electrodes to have different occupation areas. A light source lamp comprises a light source body(200). The light source body has a plurality of discharge spaces(240), which are defined by barriers(250). Plural pairs of electrodes are provided at both ends of the discharge spaces. A voltage is applied to each of the discharge spaces through the electrodes. The plural pairs of electrodes have different contact areas with the discharge spaces. The occupation area of the electrode gets smaller from upper and lower sides to the center region of the light source body.

Description

Light source lamp with luminance uniformity {OPTICAL SOURCE LAMP WITH BRIGHTNESS ACTIVATION UNIFORMITY}

1 is a front view showing the configuration of a light source lamp according to a conventional embodiment.

2 and 3 are front views showing the configuration of a light source lamp according to a first preferred embodiment of the present invention. FIG. 2 is a view showing a light source lamp in which a transverse width of an electrode is adjusted, and FIG. 3 is a longitudinal width of an electrode. A diagram showing an adjusted light source lamp.

Figure 4 is a front view showing the configuration of a light source lamp according to a second embodiment of the present invention.

5 is an exploded perspective view showing a backlight device employing a light source lamp according to a first embodiment of the present invention.

6 is an exploded perspective view showing a backlight device employing a light source lamp according to a second embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source lamp employed in a backlight device of a liquid crystal display device, and more particularly to a light source lamp having luminance uniformity.

Typically, liquid crystals have both electrical and optical properties. The arrangement of the liquid crystal is changed in correspondence with the direction of the electric field by the electrical properties, and the transmittance of light is changed in response to the arrangement by the optical properties. A known liquid crystal display (LCD) displays an image using the electrical and optical characteristics of the liquid crystal. Liquid crystal displays have the advantages of being very small in volume and light in weight compared to CRTs, etc. As a result, they are widely used in portable computers, communication devices, liquid crystal TVs, and aerospace industries.

The light supply part of the conventional liquid crystal display device has been mainly used a cold cathode fluorescent lamp (CCFL) having a rod shape or a light emitting diode (LED) having a dot shape. Cold cathode ray tube type lamp has the advantage of high brightness, long life, and a very small heat generation amount compared to incandescent light, etc., but also has the disadvantage of weak brightness uniformity. Accordingly, the cold cathode ray tube lamp further includes an optical member such as a light guide panel (LGP), a diffusion member, a prism sheet, or the like to increase luminance uniformity. For this reason, the liquid crystal display of the cold cathode ray tube lamp has a problem in that the volume and weight of the optical member are greatly increased.

The flat light source lamp 10 which solves this problem is shown in FIG. As shown in FIG. 1, the conventional surface light source lamp 10 includes a light source body 100 including discharge spaces 140 and a plurality of partitions 150 that isolate the discharge spaces 140 from each other. It is composed of In addition, the light source body 100 is provided with an external electrode 130 on the outside thereof to apply a voltage to the discharge spaces 140. In the discharge space 140, a fluorescent layer (not shown) is applied to the discharge space 140, and the electrodes 130 are arranged along the direction orthogonal to the direction in which the partition walls 150 face. Each of the electrodes 130 provided in the discharge spaces 140 may be attached in the form of a tape, spray, or powder.

When a discharge voltage is applied to the electrode 130, a discharge is generated in the discharge spaces 140, and the ultraviolet rays generated by the discharge excite the fluorescent layer to generate visible light, thereby generating a light source of the backlight device. Will be provided. The light source lamp mentioned is used as a light source for the liquid crystal backlight of a TV monitor or a notebook.

However, in the conventional surface light source lamp, when the plurality of discharge spaces 140 and the partition walls 150 are disposed in parallel, and a voltage is applied to the electrode 130, the upper and lower ends of the plurality of discharge spaces 140 are provided. The problem arises that the discharge space located at is lower in luminance than the discharge space disposed in the middle.

Moreover, the conventional backlight device having a light source lamp uses a diffuser plate not shown to provide uniformity of luminance between the light emitting area and the non-light emitting area of the discharge spaces. As the distance is required, there is a disadvantage in thinning the backlight device or the liquid crystal display device.

It is therefore an object of the present invention to provide a light source lamp with an overall brightness uniformity.

Still another object of the present invention is to provide a light source lamp that provides overall luminance uniformity by increasing luminous energy per unit area.

It is still another object of the present invention to provide a light source lamp that provides an overall brightness uniformity by modifying the electrode occupying area or modifying the volume of the discharge space.

Another object of the present invention is to provide a light source lamp in which the discharge efficiency is determined by the area occupied by the electrode when the electrode is employed outside the discharge space.

In order to achieve the above objects, the present invention is a light source lamp employed in the backlight device,

A light source body divided into a plurality of discharge spaces by a partition wall; And

The light source body is provided with a voltage applied to the discharge space, and the electrode is provided with a different contact area in the discharge space.

In addition, the present invention is a light source lamp employed in a backlight device,

A light source body composed of discharge spaces having different volumes from each other; And

It is composed of an electrode provided in the light source body for applying a voltage to the discharge space.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. In describing the present invention, specific descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

[First Embodiment]

As shown in FIG. 2, the light source lamp 20 according to the first embodiment of the present invention includes a light source body 200 having discharge spaces 240 divided into a plurality of partition walls, and the light source body 200. And a voltage is applied to the discharge gas in the discharge space 240, and the electrode 230 is provided with different contact or occupied areas (areas) in the discharge space.

The light source body 200 may be divided into a partition separation type and a partition wall type. The partition wall type light source body 200 includes a sealing member disposed between a first substrate, a second substrate disposed on the first substrate, and edges of the first and second substrates to define an internal space. The partition walls 250 are arranged in the inner space to divide the inner space into a plurality of discharge spaces 240 into which the discharge gas is injected. The partitions 250 may be configured to erect a glass tube serving as a frit, glass etching, or partition wall.

The partition integrated light source body 200 includes a first substrate and a second substrate disposed on the first substrate. Either the first substrate or the second substrate has a plurality of partitions 250 integrally. The substrate in which the barrier ribs 250 are integrated is opposed to the substrate on which the barrier ribs 250 are disposed to form a plurality of discharge spaces 240 into which the discharge gas is injected. The outermost partitions are joined via a sealing frit (not shown).

The partitions and the sealing member are joined by frits. In the drawings, the sealing member and the frit are omitted.

The discharge spaces 240 are laterally arranged in parallel to each other, and the partitions 250 provided between the discharge spaces 240 are also arranged in parallel to each other.

Each of the electrodes 230 has a smaller occupancy area toward the center, and a larger occupancy area toward the upper and lower outer directions, thereby providing luminance uniformity. In addition, the electrode 230 is provided symmetrically with respect to the electrode located in the center. In addition, the electrode 230 deforms the occupied area by adjusting the width w1. FIG. 2 shows a light source lamp 20 employing an electrode 230 with a lateral width w1 adjusted. Each electrode 230 may be made of a material having excellent conductivity, for example, copper, nickel, silver, gold, aluminum, chromium, or the like, and may be provided in a tape, spray, or powder form.

As shown in FIG. 2, each of the electrodes 230 deforms an occupied area to uniform discharge efficiency of each of the discharge spaces 240. For example, when the area of one electrode is enlarged, the electron activity of the selected electrode is increased to improve the luminance uniformity of the selected discharge space as the temperature increases. In addition, the present invention increases the electron activity of the electrodes located in the upper and lower outer periphery where the occurrence of the dark portion is higher than the electrode having a smaller occupied area toward the center of each of the electrodes 230 provided in the discharge space 240, the overall Providing luminance uniformity of the discharge spaces 240.

In addition, the electrode 230 according to the present invention is preferably composed of a pair of external electrodes disposed on both outer sides of the discharge space, it is not particularly limited to the external electrode, it may be composed of an internal electrode. .

As shown in FIG. 3, in the light source lamp according to the present invention, the electrode 260 may be provided by adjusting the lateral width w2. The electrode 260 is configured such that its width in the lateral direction w2 gradually decreases toward the center, and gradually increases toward the upper and lower edges. Of course, the electrodes 260 are preferably symmetrically disposed up and down with respect to the electrode located at the center, for the sake of luminance uniformity.

Second Embodiment

As shown in FIG. 4, the light source lamp 30 according to the second embodiment of the present invention includes a light source body 300 having discharge spaces 340 having different volumes from each other, and the light source body 300. It is composed of electrodes 330 for applying a voltage to the discharge gas filled in the discharge space on both sides outside. Mercury gas, argon gas, neon gas, xenon gas, and the like may be used as the discharge gas, and the electrode 330 is provided in the discharge space 340 in the same manner.

The light source body 300 may be divided into a partition separating type and a partition integral type. The partition wall type light source body 300 includes a sealing member disposed between a first substrate, a second substrate disposed on the first substrate, and edges of the first and second substrates to define an internal space. The partition walls 350 are arranged in the inner space to partition the inner space into a plurality of discharge spaces 340 into which the discharge gas is injected. The partitions 350 may be configured to erect a glass tube serving as a frit, glass etching, or partition wall.

The partition integrated light source body 300 includes a first substrate and a second substrate disposed on the first substrate. Either the first substrate or the second substrate has a plurality of partitions 350 integrally. The substrate in which the barrier ribs 350 are integrated is opposed to the substrate on which the barrier ribs 350 are disposed to form a plurality of discharge spaces 340 into which the discharge gas is injected. The outermost partitions are joined via a sealing frit (not shown).

The partitions 350 and the sealing member are joined by frits. In the drawings, the sealing member and the frit are omitted.

The discharge spaces 340 are arranged in parallel with each other, and the partition wall 350 provided between the discharge spaces 340 is also arranged in parallel with each other.

The discharge space 340 is composed of different volumes from each other, in particular, the discharge spaces 340 are configured to gradually increase as the longitudinal widths w3 toward the center, and to gradually decrease toward the upper and lower outer directions. Therefore, the discharge spaces 340 are configured to increase in volume toward the center, and to decrease in volume toward the upper and lower edges. In particular, it is preferable that the discharge spaces 340 are disposed symmetrically with respect to the discharge space located at the center thereof for overall luminance uniformity.

Each of the electrodes 330 provided in the discharge space 340 is configured in the same configuration, and a material having excellent conductivity, for example, copper, nickel, silver, gold, aluminum, chromium, or the like may be used, and a tape or a spray may be used. Or it may be provided in the form of a powder.

As already described, the discharge space 340 adjusts its longitudinal width w3 to make the discharge efficiency of the entire discharge space uniform. For example, when the volume of the one discharge space is reduced, the electron density or the electron activity per unit area is increased to improve the luminance uniformity due to the temperature rise. Accordingly, the present invention reduces the volume of the discharge space 340 in the discharge spaces located in the upper and lower outer regions where the dark portion is higher than the discharge space in which the volume becomes smaller toward the center, thereby increasing the electron density per unit area. By increasing the electron activity, the luminance uniformity of the overall discharge spaces is provided.

Of course, when the light source lamp 30 according to the present invention adjusts the longitudinal width of the discharge spaces 340 in a limited horizontal and vertical size, it simultaneously adjusts the longitudinal width of each of the partition walls 350. do. 4, partition walls 350 are shown that are not equal in longitudinal width. The partition wall 350 is configured to gradually increase in the longitudinal width toward the center, and gradually increase in the vertical width toward the vertical direction.

On the other hand, the present invention can be configured to simultaneously modify the volume of the occupied area of the electrode and the volume of the discharge space to provide overall uniformity of brightness. That is, the present invention can be configured to provide luminance uniformity by controlling the longitudinal / lateral width of the electrode (adjustment of contact or occupancy area) and simultaneously controlling the longitudinal width of the discharge space (occupancy volume). .

[Backlight device]

5 and 6, the configuration of the backlight device 50 employing the light source lamps 20 and 30 according to the present invention will be described in detail. 5 is an exploded perspective view showing the configuration of a backlight device employing a light source lamp 20 (shown in FIG. 3) according to a first embodiment of the present invention. 6 is an exploded perspective view showing the configuration of a backlight device 50 employing a light source lamp 30 according to a second embodiment of the present invention.

As shown in FIG. 5, the backlight device according to the present invention includes a light source lamp 20, an upper and lower cases 515 and 510, an optical sheet 530, and an inverter 540 shown in FIG. 3.

Since the light source lamp 20 employed in the backlight device 50 shown in FIG. 5 is configured in the same manner as the light source lamp 20 of FIG. 3 and has already been described in detail, a detailed description thereof will be omitted. In addition, it should be noted that the light source lamp 20 shown in FIG. 2 may be equally employed in the backlight device 50.

As shown in FIG. 5, the lower case 510 is provided with a storage space to safely store the light source lamp 20. The upper case 515 is coupled to the lower case 510 to safely store the light source lamp 20 and the optical sheet 530. The inverter 540 is disposed on the bottom of the lower case 510 to generate a discharge voltage for driving the light source lamp 20. The discharge voltage is applied to the external electrodes of the surface light source device 20 by electrical connection means, respectively. The optical sheet 530 may be formed of a diffusion plate for uniformly diffusing the light emitted from the light source lamp 20 and a prism for imparting the straightness of the diffused light.

In the backlight device 50 shown in FIG. 6, the light source lamp 30 is omitted because it has already been described in detail in the description of FIG. 4, and the rest of the rest is omitted because it has been described in detail in FIG.

As described above, the present invention provides the overall brightness uniformity of the light source lamp to achieve the overall brightness uniformity of the backlight device. Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but it will be apparent to those skilled in the art that various modifications are possible without departing from the scope of the present invention.

Claims (11)

In the light source lamp employed in the backlight device, A light source body divided into a plurality of discharge spaces by a partition wall; And And a light source lamp provided in the light source body and configured to apply a voltage to the discharge space and have different contact areas in the discharge space. The light source lamp of claim 1, wherein the electrodes are provided in the discharge spaces, respectively, and the occupied area becomes smaller toward the center, and the occupied area is enlarged toward the upper and lower peripheries. The light source lamp of claim 1, wherein the electrodes are formed of external electrodes disposed in pairs on both sides of the discharge spaces. The method of claim 1, wherein the discharge spaces are configured to be identical to each other and arranged in parallel, the partitions are configured to be identical to each other and arranged in parallel, and the discharge spaces and the partitions are arranged in parallel to each other. Light source lamp made with. The light source lamp of claim 1, wherein the electrodes are provided symmetrically with respect to the electrode positioned at the center thereof. The light source lamp of claim 1, wherein the electrodes are deformed by adjusting respective longitudinal widths or transverse widths. In the light source lamp employed in the backlight device, A light source body composed of discharge spaces having different volumes from each other; And And a light source lamp provided in the light source body and configured to apply a voltage to the discharge space. 8. The light source lamp of claim 7, wherein the discharge spaces are configured such that their longitudinal widths gradually increase toward the center and gradually decrease toward the upper and lower outer directions. The light source lamp of claim 7, wherein the discharge spaces are configured to gradually increase in volume toward the center and to gradually decrease in volume in the vertical direction. The light source lamp of claim 7, wherein the electrodes are identically provided in the discharge spaces, respectively. The light source lamp of claim 7, wherein the discharge spaces are arranged in a vertical symmetry with respect to the discharge space located at the center thereof.

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