KR20080087535A - 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
KR20080087535A
KR20080087535A KR1020070029911A KR20070029911A KR20080087535A KR 20080087535 A KR20080087535 A KR 20080087535A KR 1020070029911 A KR1020070029911 A KR 1020070029911A KR 20070029911 A KR20070029911 A KR 20070029911A KR 20080087535 A KR20080087535 A KR 20080087535A
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KR
South Korea
Prior art keywords
light source
electrode
substrate
discharge
source body
Prior art date
Application number
KR1020070029911A
Other languages
Korean (ko)
Inventor
윤형빈
Original Assignee
삼성코닝 주식회사
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Application filed by 삼성코닝 주식회사 filed Critical 삼성코닝 주식회사
Priority to KR1020070029911A priority Critical patent/KR20080087535A/en
Publication of KR20080087535A publication Critical patent/KR20080087535A/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

Abstract

A surface light source and a backlight unit having the same are provided to stabilize discharges by suppressing interference between electrodes. A surface light source includes a light source body and an electrode unit. The light source body has an inner discharge space. The electrode unit applies a discharge voltage on the discharge space of the light source body. The electrode unit includes plural sub electrodes. At least one pair of the adjacent sub electrodes has the same phases or the same polarities. One pair of first and second electrodes(270a,270b,280a,280b) with the same phases or polarities are alternatively arranged in the electrode unit. Plural discharge channels are formed in the light source body.

Description

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

1 is a perspective view showing an example of a surface light source device having a discharge channel.

2 is a cross-sectional view taken along the line X-X 'of FIG.

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

4 is an enlarged view of a portion A of FIG. 3;

5 is a partial cross-sectional view of FIG. 1.

6 is a sectional view showing a surface light source device according to another embodiment of the present invention.

7 is a plan view showing a surface light source device according to another embodiment of the present invention.

8 is a plan view showing a surface light source device according to another embodiment of the present invention.

9 is a plan view showing a surface light source device according to another embodiment of the present invention.

10 is a perspective view showing a flat surface light source device according to another embodiment of the present invention.

FIG. 11 is a sectional view taken along the line Y-Y 'of FIG. 10; FIG.

12 is another sectional view taken along the line Y-Y 'of FIG.

13 is a cross-sectional view taken along the line Y-Y 'of FIG.

14 is a plan view showing an electrode unit applied to the surface light source device of FIG.

15 is a plan view showing another electrode unit applied to the surface light source device of FIG.

16 is an exploded perspective view of a backlight unit including the surface light source device of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

200: surface light source device 212: first substrate

214: second substrate 220: light emitting area

240a, 240b: non-emitting area 250: discharge channel

270a, 270b: first electrode 275: lead-out

280a, 280b: second electrode 285: lead-out

The present invention relates to a surface light source device and a backlight unit having the same, and proposes a surface light source device having improved discharge stability by changing an electrode structure.

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 a high power consumption, but has an advantage of 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. 1 and 2, an example of a surface light source device 100 having a plurality of discharge channels is illustrated. The surface light source device 100 includes a light source body 110 and electrode units 160 provided on outer surfaces of both edges of the light source body 110.

The light source body 110 includes a first substrate 112 and a second substrate 114 disposed to face each other at a predetermined interval. A plurality of partition walls 140 are disposed between the first substrate and the second substrate to divide the space between the first substrate and the second substrate into a plurality of discharge channels 120. A sealing member 130 is disposed between the edges of the first substrate 112 and the second substrate 114 to isolate the discharge channels 120 from the outside. Discharge gas is injected into the discharge space 150 inside the discharge channel 120.

In order to drive the surface light source device, a pair of electrode portions 160 having a band shape are formed on the first substrate 112 and / or the second substrate 114. As described above, the surface light source device having the external electrode has a disadvantage that the discharge efficiency is low due to the high initial discharge voltage and the volume of the driving circuit is inevitably increased.

In addition, in the conventional surface light source device, since a pair of electrode portions are substantially spaced from each other, there is a limit to the use of various discharge gases having different discharge mechanisms.

An object of the present invention is to provide a surface light source device and a backlight unit with improved discharge stability.

Further, another object of the present invention is to provide a surface light source device and a backlight unit in which interference between adjacent discharge spaces is suppressed.

The present invention includes a light source body having a discharge space therein, and an electrode unit for applying a discharge voltage to the discharge space of the light source body, wherein the electrode unit includes a plurality of sub-electrodes, and includes at least one of adjacent sub-electrodes. Provided is a surface light source device characterized in that the pair is an electrode of the same phase or the same polarity.

The electrode unit is alternately arranged with a pair of first electrode and second electrode of the same phase or the same polarity. The first electrode and the second electrode may be formed in an interdigitated structure.

The light source body may have a plurality of discharge channels formed therein, and when the light source body includes a first substrate and a second substrate, the discharge channel may be integrally formed on at least one of the first substrate and the second substrate. Can be. In contrast, the light source body may include a first substrate, a second substrate, and a plurality of partition walls that divide a discharge space between the first substrate and the second substrate into a plurality of discharge channels.

In addition, the light source body may include a flat first substrate and a second substrate, and a plurality of spacers may be formed inside the light source body.

The present invention also includes a light source body having a discharge space therein, and an electrode unit for applying a discharge voltage to the discharge space of the light source body, wherein the electrode unit includes a plurality of sub-electrodes, and among the adjacent sub-electrodes. A surface light source device wherein at least one or more pairs are electrodes of the same phase or the same polarity; A case accommodating the surface light source device; And an inverter configured to apply a voltage to the electrode.

According to the present invention, the discharge efficiency can be maximized regardless of the shape or structure of the light source body of the surface light source device. In particular, interference between adjacent electrodes can be prevented to enable stable discharge, thereby improving product reliability and durability of the surface light source device. You can. In addition, other gases other than mercury may be used as the discharge gas encapsulated inside the light source body, thereby providing an environment-friendly product. In addition, it is possible to shorten the luminance stabilization time of the surface light source device, improve luminance uniformity, and prevent abnormal discharge such as a pinky phenomenon.

3 is a cross-sectional view of the surface light source device 200 according to an embodiment of the present invention. The light source body includes a first substrate 212 and a second substrate 214. The first substrate 212 is curved to form a plurality of discharge channels 250a and 250b in the light source body.

The first electrode 270 and the second electrode 280 are disposed on the outer surface of the first substrate 212 having the discharge channel 250 as shown in the enlarged view of FIG. 4. The first electrode and the second electrode may be formed of, for example, a strip-shaped conductive pattern or a fine wire parallel to the length direction of the discharge channel.

In the conventional surface light source device, as illustrated in FIG. 5, the electrode portions 160 are formed at both ends in the longitudinal direction of the discharge channel 150, thereby increasing the discharge start voltage and using various discharge gases. . On the other hand, in the present invention, since the electrode parts (the first electrode and the second electrode) are disposed very close to the discharge space inside the discharge channel, the discharge characteristics of the surface light source device are improved, and in particular, it is effective for the discharge of mercury gas such as Xe. .

In the present invention, the electrode parts are alternately arranged in pairs of sub-electrodes to which voltages of the same polarity or the same phase are applied. As shown in FIG. 3, a pair of first electrodes 270a and 270b having the same polarity or phase are arranged in the vicinity of the non-light emitting region between one discharge channel 250a and another adjacent discharge channel 250b. . In addition, a pair of second electrodes 280a and 280b different in polarity or phase from the first electrode is disposed near another non-light emitting region. As a whole, the first electrode and the second electrode are alternately arranged in pairs. As described above, the sub-electrodes of the same polarity or the same phase are paired to be disposed in the non-light emitting region between the discharge channels, thereby suppressing interference that may occur between adjacent electrodes. As a result, stable discharge is possible in each discharge channel.

FIG. 6 illustrates an electrode portion formed on an outer surface of a second substrate 214 on which a discharge channel is not formed among substrates constituting the light source body. In this case, since the electrode part does not obstruct the optical path at the light exit surface, higher luminance can be realized.

The first electrode and the second electrode are disposed in the discharge channel 250 region on the outer surface of the flat second substrate 214. Electrode pairs of the same polarity or the same phase are disposed in the non-light emitting regions 240a and 240b between the light emitting regions 220. For example, a pair of first electrodes 270a and 270b may be disposed in one non-light emitting area 240a, and a pair of second electrodes 280a and 280b may be disposed in another non-light emitting area 240b.

In the discharge channel 250, first and second electrodes having different polarities or different phases are disposed to cause discharge in a space inside the discharge channel. Since the electrode pairs of the same polarity or the same phase are arranged with the non-light emitting region interposed therebetween, interference between adjacent electrodes is suppressed and current can be prevented from being biased between adjacent discharge channels.

The first electrodes 270a and 270b and the second electrodes 280a and 280b are alternately arranged in parallel on the surface of the second substrate 214 as shown in FIG. 7, and interdigitated as a whole. It is formed in a structure. The ends of the plurality of first electrodes 270a and 270b and the plurality of second electrodes 280a and 280b are formed at the common lead portions 275 and 285, respectively. A discharge voltage can be applied to a plurality of electrodes at the same time through the common lead-out unit, and electrical connection with an external device (for example, a driving circuit) is easy.

Meanwhile, the first electrodes 270a and 270b and the second electrodes 280a and 280b may be formed in a wedge shape further including a plurality of fine stems as shown in FIG. 8. The uniformity of the voltage applied to the discharge space by the fine stems may be increased, and as a result, the discharge efficiency of the electrode unit may be further increased. In this case as well, the electrodes of the same polarity or the same phase are arranged so as to face each other with one non-light emitting area (partition part) interposed therebetween.

9 is an electrode part formed on both the upper and lower surfaces of the light source body as another embodiment of the present invention. Both upper and lower surfaces of the light source body are alternately arranged in pairs of sub-electrodes to which voltages of the same polarity or phase are applied. The sub-electrode group Xh1, Xh2, Xl1, and Xl2 having a first polarity or a first phase around the non-light emitting region between the discharge channels is disposed on the upper and lower surfaces of the light source body, and the second polarity or the second Sub-electrode groups Yh1, Yh2, Y1, and Yl2 having two phases are disposed on the upper and lower surfaces of the light source body.

The sub-electrode group may apply the same discharge voltage to the discharge channel on the upper and lower surfaces of the light source body. Alternatively, the sub-electrodes Xh1, Xh2, Yh1, and Yh2 disposed on the upper surface and the sub-electrode Xl1 disposed on the lower surface of the light source body. , Xl2, Yl1, and Yl2 may be applied with the first voltage as the discharge sustain voltage and the second voltage smaller than the first voltage as the address voltage, respectively.

10 shows a surface light source device 300 according to another embodiment of the present invention. The surface light source device 300 includes a planar first substrate 310 and a planar second substrate 320 having the same shape as the light source body.

The surface light source device has a discharge space sealed therein, and an electrode portion is formed on at least one surface (for example, the surface 310 'of the first substrate) as described later. The first substrate 310 and the second substrate 320 are preferably transparent thin glass substrates, and each thickness is not particularly limited, but a thickness of about 1 to 2 mm, preferably 1 mm or less is appropriate. The first substrate 310 and the second substrate 320 are opposed to each other at predetermined intervals, and as shown in FIG. 11, a sealing member 330 such as a frit is inserted into the edge of the internal discharge space ( 340 is formed. Alternatively, as shown in FIG. 12, the edges of both substrates may be directly fused by heating to form a sealed internal discharge space 340.

The interior defined by the first substrate 310 and the second substrate 320 may form a discharge space 340 of one open structure. Alternatively, as shown in FIG. As a result, the discharge space 340 may be divided into a plurality of sub spaces. The partition wall 350 may be separately inserted between the first substrate 310 and the second substrate 320 or may be formed by molding one surface of the two substrates to partially protrude.

An electrode part including a plurality of first electrodes 370a and 370b and second electrodes 380a and 380b is formed on the surface of the light source body 305 of the surface light source device 300. The first electrodes 370a and 370b and the second electrodes 380a and 380b are alternately arranged in pairs in parallel, and are generally formed in a staggered staggered structure. The first electrode and the second electrode may be formed in a linear conductive band or a conductive pattern.

One end of the plurality of first electrodes 370a and 370b and the second electrodes 380a and 380b is connected to the common lead portions 375 and 385. Different signals are applied to the first electrode and the second electrode to discharge the gas injected into the internal discharge space of the surface light source device.

When barriers or spacers are not present in the inner space of the surface light source device 300, interference between electrodes may be caused during discharge in a region where the first electrode and the second electrode are adjacent to each other. As shown in FIG. 15, an insulator 390 may be additionally formed. The insulator 390 may be linearly disposed in parallel with the first electrode and the second electrode and locally formed between the first electrode and the second electrode.

16 is an exploded perspective view showing a backlight unit including the surface light source device according to the present invention. As shown, the backlight unit includes a surface light source 200, upper and lower cases 1100 and 1200, an optical sheet 900, and an inverter 1300. The lower case 1200 includes a bottom portion 1210 and a plurality of sidewall portions 1220 extending to form an accommodation space from an edge of the bottom portion 1210 to accommodate the surface light source 200. The surface light source 200 is accommodated in the storage space of the lower case 1200.

The inverter 1300 is disposed on the rear surface of the lower case 1200 and generates a discharge voltage for driving the surface light source 200. The discharge voltage generated from the inverter 1300 is applied to the electrodes of the surface light source 200 through the first and second power lines 1352 and 1354, respectively.

The optical sheet 900 may include a diffuser plate for uniformly diffusing the light emitted from the surface light source 200, a prism sheet for imparting linearity to the diffused light, and the like. The upper case 1100 is coupled to the lower case 1200 to support the surface light source 200 and the optical sheet 900. The upper case 1100 prevents the surface light source 200 from being separated from the lower case 1200.

Unlike the illustrated figure, the upper case 1100 and the lower case 1200 may be formed as one integrated case. On the other hand, the backlight unit according to the present invention may not include the optical sheet 900 because the brightness and luminance uniformity of the surface light source device is excellent.

The present invention has been exemplarily described through the preferred embodiments, but the present invention is not limited to such specific embodiments, and various forms within the scope of the technical idea presented in the present invention, specifically, the claims. May be modified, changed, or improved.

As described above, according to the present invention, regardless of the shape or structure of the light source body of the surface light source device, the discharge efficiency can be maximized, and in particular, the inter-electrode interference is prevented, so that stable discharge is possible. It can improve the reliability and durability.

In addition, other gases other than mercury may be used as the discharge gas encapsulated inside the light source body, thereby providing an environment-friendly product.

In addition, it is possible to shorten the luminance stabilization time of the surface light source device, improve luminance uniformity, and prevent abnormal discharge such as a pinky phenomenon.

Claims (14)

A light source body having a discharge space therein, An electrode unit for applying a discharge voltage to the discharge space of the light source body, The electrode unit includes a plurality of sub-electrodes, and at least one or more pairs of adjacent sub-electrodes are electrodes of the same phase or the same polarity. Surface light source device. The surface light source device of claim 1, wherein the first electrode part and the second electrode of the same phase or the same polarity are alternately arranged. The surface light source device of claim 1, wherein the light source body has a plurality of discharge channels formed therein. The surface light source device of claim 3, wherein the light source body includes a first substrate and a second substrate, and the discharge channel is integrally formed on at least one of the first substrate and the second substrate. The surface light source device of claim 3, wherein the light source body includes a first substrate, a second substrate, and a plurality of partition walls that divide a discharge space between the first substrate and the second substrate into a plurality of discharge channels. The surface light source device of claim 1, wherein the light source body includes a first flat plate and a second substrate, and a plurality of spacers are formed inside the light source body. The surface light source device of claim 6, wherein the first electrode and the second electrode are alternately arranged on the surface of the light source body. 8. The surface light source device of claim 7, wherein a dielectric layer is further formed between the first electrode and the second electrode. The surface light source device of claim 1, wherein the electrode unit comprises a plurality of sub-electrodes formed on the surface of the light source body in parallel in one direction and a lead-out unit integrally connecting one end of the sub-electrode. The surface light source device of claim 1, wherein the light source body includes a plurality of discharge channels, and the electrode part is disposed on an upper surface and a lower surface of the light source body, respectively. A light source body having a discharge space therein, and an electrode unit applying a discharge voltage to the discharge space of the light source body, wherein the electrode unit includes a plurality of sub-electrodes, and at least one pair of adjacent sub-electrodes A surface light source device which is an electrode of the same phase or the same polarity; A case accommodating the surface light source device; And Including an inverter for applying a voltage to the electrode Backlight unit. The backlight unit of claim 11, wherein the light source body has a plurality of discharge channels formed therein. The backlight unit of claim 11, wherein the light source body comprises a flat first substrate and a second substrate. The backlight unit of claim 11, wherein the first electrode and the second electrode of the interdigitated structure are alternately arranged on the surface of the light source body.
KR1020070029911A 2007-03-27 2007-03-27 Surface light source and backlight unit having the same KR20080087535A (en)

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KR1020070029911A KR20080087535A (en) 2007-03-27 2007-03-27 Surface light source and backlight unit having the same

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