KR20090056119A - Surface light source and backlight unit having the same - Google Patents

Surface light source and backlight unit having the same Download PDF

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Publication number
KR20090056119A
KR20090056119A KR1020070123132A KR20070123132A KR20090056119A KR 20090056119 A KR20090056119 A KR 20090056119A KR 1020070123132 A KR1020070123132 A KR 1020070123132A KR 20070123132 A KR20070123132 A KR 20070123132A KR 20090056119 A KR20090056119 A KR 20090056119A
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KR
South Korea
Prior art keywords
light source
substrate
electrode
discharge channel
discharge
Prior art date
Application number
KR1020070123132A
Other languages
Korean (ko)
Inventor
윤형빈
정경택
Original Assignee
삼성코닝정밀유리 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 삼성코닝정밀유리 주식회사 filed Critical 삼성코닝정밀유리 주식회사
Priority to KR1020070123132A priority Critical patent/KR20090056119A/en
Publication of KR20090056119A publication Critical patent/KR20090056119A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/305—Flat vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/16—Selection of substances for gas fillings; Specified operating pressure or temperature having helium, argon, neon, krypton, or xenon as the principle constituent

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

A surface light source and a backlight unit having the same are provided to improve brightness and light efficiency by improving the layout structure of the second electrodes and the first electrodes. The surface light source device comprises a light source body, and a first electrode and a second electrode(160). The light source body comprises a first substrate(120) and a second substrate(130). A plurality of discharge channels is formed between the first substrate and the second substrate. The first electrode is formed in the surface of the first substrate. The first electrode is arranged in the side of each discharge channel. The second electrode is formed in the surface of the second substrate. The second electrode is arranged in the center of each discharge channel.

Description

Surface light source device and backlight unit having the same {SURFACE LIGHT SOURCE AND BACKLIGHT UNIT HAVING THE SAME}

The present invention relates to a surface light source device suitable for using a discharge gas free of mercury and having a plurality of discharge channels, and a backlight unit having the same.

The liquid crystal display displays an image by using electrical and optical characteristics of the liquid crystal. Since the liquid crystal part of the liquid crystal display is a light receiving element that does not generate light by itself, it separately requires a rear light source, that is, a backlight.

Light supplied from the rear light source sequentially passes through the pixel electrode, the liquid crystal, and the common electrode of the liquid crystal display. In this case, the display quality of the image passing through the liquid crystal largely depends on the luminance and luminance uniformity of the rear light source. In general, the higher the luminance and the uniformity of the luminance, the better the display quality.

Conventionally, a rear light source of a liquid crystal display device has been mainly used a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED). Cold cathode fluorescent lamp has the advantage of high brightness, long life, and very low heat generation compared to incandescent lamps. On the other hand, the light emitting diode has the advantage of high power consumption but excellent brightness. However, cold cathode fluorescent lamps or light emitting diodes have poor luminance uniformity. Therefore, existing back light sources require optical members such as a light guide panel (LGP), a diffusion member, a prism sheet, and the like to increase luminance uniformity. As a result, the liquid crystal display has a problem in that the volume and weight of the optical member are greatly increased.

As a back light source for a liquid crystal display, a flat fluorescent lamp (FFL) in the form of a flat plate has been proposed.

The conventional surface light source device comprises a light source body and an electrode.

The light source body includes a first substrate and a second substrate which are disposed to face each other and are formed in a flat plate type, and have a discharge space in which discharge gas is injected. The edges of the first substrate and the second substrate are sealed to seal the discharge space.

Phosphors are coated on the surfaces of the first and second substrates, and when the discharge voltage is applied to the discharge gas by the electrodes, ultraviolet rays are generated by the discharge of the discharge gas. The generated ultraviolet rays excite the phosphor to generate visible light, and the generated visible light is transmitted forward through the substrate.

Currently, in order to improve the image quality of a large area liquid crystal display device and to realize a clearer and more natural display quality, the surface light source device needs a technology for locally controlling the luminance of the surface light source device used as a backlight.

In addition, due to the harmfulness of mercury, which is mainly used as the discharge gas, there is a demand for the development of an environment-friendly surface light source device that can use a discharge gas without mercury.

Accordingly, it is an object of the present invention to provide a surface light source device which can use a discharge gas free of mercury.

Another object of the present invention is to provide a surface light source device capable of locally controlling a luminance by dividing a discharge space into a plurality of discharge channels and applying a voltage to each divided channel.

Still another object of the present invention is to provide a surface light source device and a backlight unit having the same, wherein the phosphor coated on the central side where light is emitted to cause discharge to occur on both sides of the discharge channel can prevent phosphor deterioration due to ion collision. To provide.

In accordance with another aspect of the present invention, a surface light source device includes a light source body having a first substrate and a second substrate on which a plurality of discharge channels are formed, and a first surface formed on a surface of the first substrate and disposed on a side surface of each discharge channel. The first electrode and the second electrode formed on the surface of the second substrate and disposed in the center of each discharge channel are characterized in that the discharge occurs in the side of the discharge channel.

According to an embodiment of the present invention, a backlight unit includes a light source body having a first substrate and a second substrate on which a plurality of discharge channels are formed, and a first formed on a surface of the first substrate and disposed on a side of each discharge channel. Applying a voltage to a surface light source device comprising an electrode and a second electrode formed on the surface of the second substrate and disposed in the center of each discharge channel, a chassis accommodating the surface light source device, and a first electrode and a second electrode; It is configured to include an inverter.

The surface light source device of the present invention configured as described above can prevent the deterioration of the phosphor in the light emitting portion by causing the discharge in a diagonal direction on both sides of the discharge channel, thereby improving the brightness and efficiency There is an advantage.

In addition, it is possible to inject a discharge gas of mercury is excluded in the discharge channel can provide an environmentally friendly surface light source device.

In addition, a plurality of discharge channels may be applied with voltages for respective channels or for divided regions to obtain light emission characteristics having locally controlled luminance. Therefore, the luminance of the surface light source can be partially controlled according to the brightness of the screen of the liquid crystal display device, thereby ensuring clear and natural image quality.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a surface light source device according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the surface light source device according to an embodiment of the present invention.

The illustrated surface light source device 100 includes a light source body 110 forming a discharge space into which discharge gas is injected, and electrodes 150 and 160 formed on a surface of the light source body 110 to apply a discharge voltage to the discharge gas. It is configured by. The light source body 110 includes a first substrate 120 and a second substrate 130. The first substrate 120 and the second substrate 130 are preferably formed of a transparent glass substrate. The first substrate 120 and the second substrate 130 are disposed to face each other, and one of the two substrates 120 and 130 has a structure formed in a predetermined shape to form a plurality of discharge channels 140.

In the present exemplary embodiment, the first substrate 120 disposed at the upper side to emit light has a structure formed to form a plurality of discharge channels 140, and the second substrate 130 disposed at the lower side is formed in a flat plate shape. do. In the drawing, the discharge channel 140 is formed on the first substrate 120, but the present invention is not limited thereto. The discharge channel is formed on the second substrate 130, or both the first substrate 120 and the second substrate 130 are formed. It can be molded to everything.

The first substrate 120 is formed with a plurality of discharge channels 140 at equal intervals, and is attached to the upper surface of the second substrate 130. Accordingly, the molded portion of the first substrate 120 in contact with the second substrate 130 serves as a partition wall for partitioning each discharge space 160 and also serves as a spacer for maintaining the discharge space.

Such a substrate forming type does not require a separate spacer for supporting the discharge space between the first substrate 120 and the second substrate 130, so that the manufacturing process can be simplified and sufficiently cope with the impact stress of the surface light source device. It has strength.

The discharge channel 140 may be formed in various forms to form the discharge space 160. That is, it may be molded in an elliptic shape, both sides of the discharge channel 140 may be formed in an inclined surface, and may be formed in a trapezoidal shape in which the upper surface thereof is a flat surface, and may be molded in a semicircular shape.

Edges of the first substrate 12O and the second substrate 130 may be joined by a sealing member 180 such as a frit, or may be directly fused using a heating means such as a laser. In addition, a portion where the first substrate and the second substrate are in contact with each other (the portion formed to form the discharge channel of the first substrate and the upper surface of the second substrate) may be joined with a sealing member such as a frit. It can fuse directly using a heating means, such as a laser.

A fluorescent layer may be coated on the inner surface of the discharge channel 140 formed on the first substrate 120, and a fluorescent layer, a reflective layer, and a fluorescent layer may be applied on the inner surface of the discharge substrate 140.

Various types of discharge gas may be selected as the discharge gas injected into the discharge space 160, but preferably, a gas excluding mercury such as xenon, argon, neon, other inert gas, or a mixed gas thereof is used.

In particular, when a discharge gas excluding mercury is used, it not only provides an environmentally friendly advantage, but also shortens the luminance stabilization time even when driving at low temperature. In addition, due to the temperature sensitivity of the mercury, it provides an advantage that can minimize the problem that the brightness uniformity of the surface light source device in accordance with the temperature deviation.

3 and 4, a plurality of first electrodes 210a and 210b are formed on the surface of the first substrate 120 in parallel with the longitudinal direction of the discharge channel 140 and the second substrate 130. ), A second electrode 220 is formed in parallel with the first electrodes 210a and 210b.

The first electrodes 210a and 210b and the second electrode 220 may be directly coated on the surfaces of the first substrate 120 and the second substrate 130, and may be formed of a stripe wire or band-shaped conductive tape. It can be formed by attaching.

The first electrodes 210a and 210b and the second electrode 220 may use transparent electrodes (eg, ITO), other conductive materials may be used, and preferred materials may include copper, silver, gold, aluminum, nickel, Any one material selected from chromium, ITO, carbon-based conductive material, conductive polymer, or a composite material thereof may be used.

The first electrodes 210a and 210b are arranged in plural at regular intervals on both sides of the discharge channel 140. Here, since both sides of the discharge channel 140 are formed in a curved or inclined shape, the plurality of first electrodes 210a and 210b are disposed at different positions. That is, the plurality of first electrodes 210a and 210b may be arranged at both sides of the discharge channel 140 at predetermined intervals in the width direction so that the first electrodes may have different heights.

As shown in FIG. 4, the second electrode 220 is formed in the center of the discharge channel 140 in parallel with the longitudinal direction of the discharge channel 140. The second electrodes 220 are disposed to be separated at regular intervals in parallel with the longitudinal direction of the discharge channel 140, and the second electrodes 220 corresponding to the columns of each discharge channel 140 are connected to the connection electrode 230. Can be applied to the voltage.

 As such, the first electrodes 210a and 210b are disposed on both side surfaces of the discharge channel 140, and the second electrode 220 is disposed at the center of the discharge channel 140, thereby providing two first electrodes 210a. A discharge occurs between the 210b and the second electrode 220. As a result, a discharge occurs diagonally in both sides of the discharge channel 140 in the discharge space 160.

That is, the discharge D1 between the first electrode 210a and the second electrode 220 disposed on the left side of the discharge channel 140 occurs in a diagonal direction while being biased to the left side of the discharge channel 140. The discharge D2 between the first electrode 210b and the second electrode 220 disposed on the right side of the discharge channel 140 occurs in a diagonal direction while being oriented to the right side of the discharge channel 140.

As the discharges D1 and D2 occur in the diagonal directions on the left and right sides of the discharge channel 140 as described above, since there is no direct ion collision with the phosphor coated on the central side of the discharge channel 140 where the light is emitted, the discharge channel 140 It is possible to prevent deterioration of the phosphor coated on the central side of the substrate, thereby improving brightness and efficiency of the surface light source device.

5 is a partial cross-sectional view of the surface light source device according to the second embodiment of the present invention.

The surface light source device according to the second embodiment includes a first substrate 120 having a plurality of discharge channels 140 formed at equal intervals, and a second substrate 130 attached to the first substrate 120. The light source body 110, the plurality of first electrodes 310a and 310b having different heights on both sides of the discharge channel 140, and the discharge channel 140. It includes a second electrode (320a, 320b) arranged in a pair in the center of the).

In the surface light source device according to the second embodiment, a discharge occurs between the first electrode 310a arranged on the left side of the discharge channel 140 and one electrode 320a of the pair of second electrodes, and the discharge channel 140 A discharge occurs between the first electrode 310b arranged on the right side of the side) and the other electrode 320b of the pair of second electrodes.

Since the operation and effect of the surface light source device according to the second embodiment is the same as the operation and effect of the surface light source device described in the above embodiment, a detailed description thereof will be omitted.

In the surface light source device of FIG. 6, the first electrodes 330a and 330b are disposed on both sides of the discharge channel 140 and correspond to the center of the discharge channel 140. One second electrode 340 may be disposed on the surface of the second substrate 130, and as shown in FIG. 7, the first electrodes 350a and 350b are disposed at both sides of the discharge channel 140. Each of the two electrodes 360a and 360b may be disposed in pairs on the surface of the second substrate 130 corresponding to the center of the discharge channel 140.

8 is an exploded perspective view showing a backlight unit related to an embodiment of the present invention.

As illustrated, the backlight unit includes the surface light source device 100 described above, the bottom chassis 500, the fixed frame 600, and the inverter 700.

The bottom chassis 500 accommodates the surface light source device 100.

As the surface light source device 100, the surface light source device described above is used.

The optical sheet 800 is disposed on the top surface of the surface light source device 100. The optical sheet 800 may be composed of a diffusion sheet and a prism sheet.

The fixing frame 600 is coupled to the bottom chassis 500 to fix the optical sheet 800 to be disposed on the top surface of the surface light source device 100.

In the LCD, the liquid crystal panel is positioned in front of the fixed frame 600.

The inverter 700 is electrically connected by the first electrode 210 and the wire 710, and electrically connected by the second electrode 220 and the wire 720 to generate a high-voltage discharge voltage. The surface light source device 100 is driven by supplying it to 210 and 220.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art or those skilled in the art without departing from the spirit and scope of the invention described in the claims to be described later Various modifications and variations can be made in the present invention without departing from the scope thereof.

1 is a perspective view of a surface light source device according to an embodiment of the present invention.

2 is a cross-sectional view of a surface light source device according to an embodiment of the present invention.

3 is a top view of the surface light source device according to the embodiment of the present invention.

4 is a bottom view of the surface light source device according to the embodiment of the present invention.

5 is a partial cross-sectional view of the surface light source device according to the second embodiment of the present invention.

6 is a partial cross-sectional view of the surface light source device according to the third embodiment of the present invention.

7 is a partial cross-sectional view of a surface light source device according to a fourth embodiment of the present invention.

8 is an exploded perspective view of a backlight unit according to an embodiment of the present invention.

Claims (8)

A light source body having a first substrate and a second substrate on which a plurality of discharge channels are formed; A first electrode formed on a surface of the first substrate and disposed on a side of each discharge channel; And a second electrode formed on a surface of the second substrate and disposed in the center of each discharge channel. The method of claim 1, And the discharge channel is formed on the first substrate itself. The method of claim 1,    The first electrode is a surface light source device, characterized in that disposed in parallel to the longitudinal direction of the discharge channel. The method of claim 1, The first electrode is a surface light source device, characterized in that the plurality of height is arranged on both sides of the discharge channel different from each other. The method of claim 1, And the second electrode is disposed parallel to the longitudinal direction of the discharge channel and separated from each other at a predetermined interval. The method of claim 1, And the second electrodes are disposed in pairs in the center of the discharge channel to cause discharge with the first electrodes respectively disposed on both sides of the discharge channel. The method of claim 1, The discharge channel is a surface light source device, characterized in that formed in any one of the elliptical shape, semi-circular shape and trapezoidal shape. A light source body having a first substrate and a second substrate having a plurality of discharge channels formed thereon, and a first electrode formed on a surface of the first substrate and disposed on a side of each discharge channel, and formed on a surface of the second substrate; A surface light source device including a second electrode disposed at the center of each discharge channel; A chassis accommodating the surface light source device; And And an inverter for applying a voltage to the first electrode and the second electrode.
KR1020070123132A 2007-11-30 2007-11-30 Surface light source and backlight unit having the same KR20090056119A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070123132A KR20090056119A (en) 2007-11-30 2007-11-30 Surface light source and backlight unit having the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070123132A KR20090056119A (en) 2007-11-30 2007-11-30 Surface light source and backlight unit having the same

Publications (1)

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KR20090056119A true KR20090056119A (en) 2009-06-03

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KR1020070123132A KR20090056119A (en) 2007-11-30 2007-11-30 Surface light source and backlight unit having the same

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