KR100673317B1 - Surface light source device with surface division drive control - Google Patents

Abstract

A surface light source device having a surface division driving control function is disclosed. The surface light source device of the present invention includes at least one electrode pair consisting of a first electrode and a second electrode located on different planes, and is characterized in that the discharge region capable of driving control independently is arranged in a matrix form. It has a split drive control function. Accordingly, each discharge region can be driven independently to independently control the luminance.

Surface light source, surface division, brightness, independent driving

Description

SURFACE LIGHT SOURCE HAVING SURFACE SEGMENTATION DRIVING CONTROL FUNCTION}

In order to more fully understand the drawings used in the detailed description of the invention, a brief description of each drawing is provided.

1 is a perspective view showing a conventional flat fluorescent lamp.

FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.

FIG. 3 is a diagram showing a surface light source device capable of split driving according to the first embodiment of the present invention.

4 is a cross-sectional view taken along line II-II ′ of FIG. 3.

FIG. 5 is a diagram showing that the flat panel display element is divided into light irradiation areas in which brightness is individually controlled by the dividing and driving surface light source device according to the present invention.

FIG. 6 is a view showing another embodiment of the formation position of the second electrode in FIG. 4.

FIG. 7 is a view showing a surface light source device capable of split driving according to a second embodiment of the present invention.

FIG. 8 is a cross-sectional view taken along line II-II ′ of FIG. 7.

FIG. 9 is a view showing another embodiment of the formation position of the second electrode in FIG. 7.

FIG. 10 is a view showing a partly driven surface light source device according to a third embodiment of the present invention.

FIG. 11 is a cross-sectional view taken along line II-II ′ of FIG. 10.

Fig. 12 is a diagram showing a dividing and driving surface light source device according to a fourth embodiment of the present invention.

FIG. 13 is a cross-sectional view taken along line II-II ′ of FIG. 12.

FIG. 14 is a view showing a surface light source device which can be dividedly driven according to a fifth embodiment of the present invention.

FIG. 15 is a cross-sectional view taken along line II-II ′ of FIG. 12.

FIG. 16 is a view showing another embodiment of the formation position of the second electrode in FIG. 14.

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

4, 104: first electrode 8,108: second electrode

6,106 dielectric layer 2,102 lower substrate

22,122: upper substrate 12,112: lower phosphor

24,124: upper phosphor 132: groove

128: spacer

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a surface light source device for a flat panel display device, and more particularly to a surface light source device having a plane split drive control function.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Flat display devices include Liquid Crystal Display (LCD), Field Emission Display (FED), Plasma Display Panel (PDP) and Electro-luminescence (EL). Display elements;

Among them, the liquid crystal display device is a typical passive flat panel display device, and is light and consumes less power, rapidly replacing the display market with a next generation display. The liquid crystal display device displays an image corresponding to the video signal on the liquid crystal display panel in which the liquid crystal cells are arranged in a matrix form by adjusting the light transmittance of the liquid crystal cells according to the video signal. To this end, a liquid crystal display device includes a liquid crystal display panel in which liquid crystal cells are arranged in an active matrix, a driving circuit for driving the liquid crystal display panel, and a light disposed on a rear surface of the liquid crystal display panel. It includes a backlight unit (Back Light Unit) for supplying. In such a liquid crystal display, the amount of light transmitted from the backlight unit is adjusted to display a desired image on a screen.

The backlight used in the liquid crystal display device may be a surface light source using a linear fluorescent lamp array such as a flat fluorescent lamp, a cold cathode fluorescent lamp or an external electrode fluorescent lamp. A direct surface light source having various structures such as a surface light source using an LED array may be used.

1 is a perspective view illustrating a conventional flat fluorescent lamp, and FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.

The flat fluorescent lamp 30 shown in FIGS. 1 and 2 includes an upper substrate 22 and a lower substrate 2 facing each other with a discharge space 5 into which discharge gas is injected, and an upper substrate 22. And a frame 18 having a rectangular frame shape to block the discharge space 5 between the lower substrate 2 and the external environment.

The lower substrate 2 includes a cathode electrode 8 and an anode electrode 4, an anode electrode 4, and a dielectric layer 6 and a dielectric layer 6 which are alternately arranged at predetermined intervals. The lower phosphor 12 positioned in front of the formed lower substrate 2 is formed. The upper substrate 22 is formed with an upper phosphor 14 facing the lower phosphor 12 on the lower substrate 2.

When the voltage is supplied between the cathode electrode 8 and the anode electrode 4, the flat fluorescent lamp 30 is discharged by electrons generated from the cathode electrode 8 and holes generated from the anode electrode 4. Ultraviolet rays generated when the inert discharge gas in the space discharges emit light at the upper and lower phosphors 14 and 12, thereby supplying light to the liquid crystal display panel.

On the other hand, such a liquid crystal display has a problem in that a screen blurring or dragging occurs when a moving image display requiring high response speed is required due to the slow response characteristics of the liquid crystal. In order to solve these problems, a black frame insertion method and a backlighting method have been proposed. However, when a black frame insertion method and a backlight blinking method are employed, another problem arises in that the luminance is sharply reduced.

Accordingly, in recent years, efforts have been made to improve the image quality by inserting a black frame or blinking the backlight, but adjusting the brightness of the backlight according to the characteristics of the image displayed on the screen. have.

However, the conventional planar fluorescent lamps shown in FIGS. 1 and 2 have a disadvantage in that the luminance amount cannot be partially controlled by adjusting only the lowering or raising the luminance as a whole. In other words, the image characteristics of various cases such as a video that requires a relatively large amount of light and a fast brightness change, and an image that requires a relatively small light and a slow brightness change are combined in one screen. When it appears, there is no satisfactory solution to the conventional light control technology of the backlight. Accordingly, there is a demand for a method capable of controlling light independently.

Accordingly, an object of the present invention is to provide a surface light source device having a plurality of surface-divided drive control regions and whose luminance is individually controlled for each drive control region.

One aspect of the present invention for achieving the above technical problem relates to a surface light source device having a surface-division drive control function.

The surface light source device having the surface-division driving control function of the present invention includes at least one electrode pair including first and second electrodes positioned on different planes, and discharge regions having independent drive control in a matrix form. Are arranged.

Preferably, the surface light source device includes a lower substrate having a plurality of grooves arranged in a matrix form on its front surface; And an upper substrate disposed to face the lower substrate with a discharge space therebetween, wherein the first electrode is positioned in an area excluding the groove, and the second electrode is disposed to correspond to the groove.

Preferably, the first electrode is formed to surround the groove and the second electrode on the front surface of the lower substrate.

Preferably, the second electrode is located correspondingly in the groove.

Preferably, the second electrode is formed on the rear surface of the lower substrate and positioned to correspond to the groove.

Preferably the groove is of circular shape.

Preferably, the groove is formed in a donut shape, and the first electrode is positioned in a protruding region at the center of the groove.

Preferably, the surface light source device includes: a lower substrate having donut-shaped first grooves arranged in a matrix shape on the front surface thereof and a second groove formed on a rear surface thereof in a center region of the first groove; And an upper substrate disposed to face the lower substrate with a discharge space therebetween, wherein the second electrode is disposed to correspond to the first groove, and the first electrode is located in the second groove.

Preferably, the surface light source device includes: a lower substrate including donut-shaped first grooves arranged in a matrix form on a front surface thereof and including a second groove formed in a central region of the first groove; And an upper substrate disposed to face the lower substrate with a discharge space therebetween, wherein the second electrode is disposed to correspond to the first groove, and the first electrode is located in the second groove.

Preferably, the depth of the first groove is formed relatively deeper than the depth of the second groove.

Preferably, the first and second electrodes are formed in a spiral form.

Preferably, the discharge path is formed in a columnar shape between the first electrode and the second electrode.

Preferably, the discharge gas injected into the discharge space of the surface light source device is a mixture of one or more kinds of discharge gas of He, Ne, Ar, Kr, Xe, Hg.

DETAILED DESCRIPTION In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the embodiments of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings. In understanding the drawings, it should be noted that like parts are intended to be represented by the same reference numerals as much as possible. And detailed description of known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention is omitted.

(Example)

Hereinafter, with reference to the accompanying drawings will be described in detail a surface light source device having a surface-division drive control function of the present invention in detail.

Example 1

3 is a perspective view illustrating a surface light source device having a surface split driving control function, that is, a flat fluorescent lamp according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line II-II 'of FIG. 3. .

3 and 4, the surface light source device shown in FIGS. 3 and 4 is a plurality of discharge regions A independently driven by an electrode pair consisting of a first electrode and a second electrode (or an anode electrode and a cathode electrode) located on different planes. This is arranged in matrix form. As a result, light sources having different sizes can be supplied to the plurality of different areas of the flat panel display device corresponding to each discharge area A, thereby enabling individual brightness control.

The specific configuration and effect of the surface light source device according to the first embodiment of the present invention will be described in detail as follows.

In the surface light source device of the present invention, the upper substrate 122 and the lower substrate 102 are disposed to face each other with a discharge space in which an inert gas, for example, xenon (Xe) or argon (Ar), is injected therebetween. . Alternatively, the discharge gas injected into the discharge space of the surface light source device may be filled with, for example, a discharge gas of one or more of He, Ne, Ar, Kr, Xe, and Hg mixed.

The lower substrate 102 has a plurality of grooves 132 arranged in a matrix shape on the front thereof, a first electrode 104 located in an area except the groove 132, and a bottom surface of the lower substrate 102. In addition, the dielectric layer 106, the dielectric layer 106, and the plurality of grooves 132 formed to cover the second electrode 108, the first electrode 104 positioned corresponding to the circular groove 132 of the matrix form. And a lower phosphor 112 formed thereon. In addition, a reflective plate 124 is formed on the rear surface of the lower substrate 102 to cover the second electrode 108 to reflect the light emitted by the discharge toward the upper substrate 122.

The upper substrate 122 is formed with an upper phosphor 114 facing the lower phosphor 112 on the lower substrate 102, and a spacer 128 is disposed between the upper substrate 122 and the lower substrate 102 to discharge the electric charge. The space can be secured and maintained.

The surface light source device having such a structure has an independent discharge region A in which each of the plurality of electrode pairs composed of the first electrode 104 and the second electrode 108 is electrically separated and driven. By differently supplying the power applied to the electrode pairs, it is possible to control different luminance for the plurality of discharge regions A arranged in a matrix form.

Referring to FIG. 5, the surface light source device 130 of the present invention is capable of generating discharges of different sizes independently of the discharge region A in the form of a matrix, thereby being combined with the surface light source device 130 of the present invention. The flat panel display device 150 has a light irradiation area B corresponding to the independent discharge area A. FIG. Therefore, the flat panel display device 150 having the light irradiation area B arranged in a matrix form can be individually controlled in luminance by supplying individual power to the plurality of discharge areas A of the surface light source device 130.

When a video that requires a relatively large amount of light and a rapid change of luminance is implemented by such a series of technologies, a large amount of discharge may be generated in a discharge area corresponding to the video implementation area, thereby supplying relatively strong light to the video implementation area. In the case of realizing an image requiring a relatively low light and a slow brightness change, a small amount of discharge may be generated in a corresponding discharge area to supply relatively weak light.

In this manner, the surface light source device is divided into a plurality of discharge regions A, and the electric power supplied to each of the discharge regions A can be independently adjusted to independently control the amount of discharge in each discharge region A. FIG. Therefore, when the flat panel display implements a still image and a moving image on one screen, the power supplied to the discharge area A corresponding to each display area is appropriately different from each other to suit the display image. Other brightness control can be achieved.

On the other hand, the position of the second electrode 108 in the first embodiment of the present invention can be located correspondingly on the back surface of the groove 132, as shown in Figure 4, the groove ( 132 may be located within. When the second electrode 108 is located in the groove 132 as shown in FIG. 6, the dielectric layer 106 is formed to cover the second electrode 108.

Example 2

FIG. 7 is a perspective view illustrating a surface light source device having a surface split driving control function, that is, a flat fluorescent lamp according to a second embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along line II-II 'of FIG. 7. .

7 and 8, the surface light source device shown in FIGS. 3 and 4 is formed in a donut shape with a groove 132 having a matrix shape, and the first electrode 104 is formed in the groove 132. Except for being located in the protruding region 133 in the center has the same components, the same components as in FIGS. 3 and 4 will be denoted by the same reference numerals and detailed description thereof will be omitted.

In the surface light source device illustrated in FIGS. 7 and 8, the grooves 132 are formed in a donut shape unlike the first embodiment of the present invention. Accordingly, the first electrode 104 is formed on the protruding region 133 protruding from the center of the donut-shaped groove 132. Here, the connection part 135 connects the protruding region 133 and the lower substrate 102 across the donut-shaped groove 132 to supply a voltage for discharging the first electrode 104. An electric wire 136 is disposed on the connection part 135 to extend from the first electrode 104 and receive a driving voltage from a separate driving part.

The second electrode 108 is formed in a donut shape in a region corresponding to the donut-shaped groove 132. Meanwhile, the second electrode 108 may be located in the donut-shaped groove 132 as shown in FIG. 9. In this case, the dielectric layer 106 is formed to cover the second electrode 108.

Such a surface discharge device having a structure allows individual discharges between the first electrode 104 and the second electrode 108 to be performed, and thus, a plurality of independent discharge regions A may be provided. In particular, in the present invention, the second electrode 108 is formed to surround the first electrode 104 so that the discharge path in the discharge region A appears circumferentially around the first electrode 104.

As described above, also in the second embodiment of the present invention, a plurality of independent discharge regions A provided by independent driving are provided in a matrix form, thereby providing luminance to the plane-division light irradiation region B of the flat panel display device 150. Can be controlled individually.

Example 3

FIG. 10 is a perspective view illustrating a surface light source device having a surface split driving control function, that is, a flat fluorescent lamp according to a third embodiment of the present invention, and FIG. 11 is a cross-sectional view taken along line II-II 'of FIG. 10. .

10 and 11 are formed in a matrix-shaped donut-shaped first groove 142 on the front surface of the lower substrate 102 and lower substrate as compared to the surface light source apparatus illustrated in FIGS. 3 and 4. The second groove 144 formed in the central region of the first groove 142 is formed at the rear surface of the 102. The first electrode 104 is formed to be buried in the second groove 144, and the second electrode 108 is formed in a donut shape in a region corresponding to the donut-shaped groove 132. Here, the second electrode 108 may be located in the donut-shaped groove 132 as shown in FIG. In this case, the dielectric layer 106 is formed so as to cover the second electrode 108 as well.

In the third embodiment of the present invention having the structure as described above, the second electrode 108 is positioned to surround the first electrode 104 similarly to the second embodiment, so that the discharge path in the discharge region A becomes the first. It appears to be circumferentially around the electrode 104.

Except for the matters described above, the third embodiment of the present invention has the same components and effects as those described in the first and second embodiments of the present invention, and thus the detailed description thereof will be omitted.

Example 4

FIG. 12 is a perspective view illustrating a surface light source device having a surface split driving control function, that is, a flat fluorescent lamp according to a fourth embodiment of the present invention, and FIG. 13 is a cross-sectional view taken along line II-II 'of FIG. 12. .

In the surface light source device shown in FIGS. 12 and 13, a matrix-shaped donut-shaped first groove 142 is formed on the front surface of the lower substrate 102 as compared with the surface light source device shown in FIGS. 3 and 4. The second groove 144 is formed in the center region of the first groove 142. Here, the depth of the first groove 142 is formed relatively deeper than the depth of the second groove 144.

The first electrode 104 is positioned to be embedded in the second groove 144, and the second electrode 108 is formed in a donut shape in a region corresponding to the first groove 142 having a donut shape. Here, the second electrode 108 may be located in the donut-shaped first groove 142 as shown in FIG. 9. In this case, the dielectric layer 106 is formed to cover the second electrode 108.

In the fourth embodiment of the present invention having the structure as described above, the second electrode 108 is positioned to surround the first electrode 104, similarly to the second embodiment, so that the discharge path in the discharge region A is first. It appears to be circumferentially around the electrode 104.

Except for the matters described above, the fourth embodiment of the present invention has the same components and effects as those described in the first to third embodiments of the present invention, and thus the detailed description thereof will be omitted.

 Example 5

FIG. 14 is a perspective view illustrating a surface light source device having a surface split driving control function, that is, a flat fluorescent lamp according to a fifth embodiment of the present invention, and FIG. 15 is a cross-sectional view taken along line II-II 'of FIG. 14. .

The surface light source device shown in FIGS. 14 and 15 is formed such that the first electrode 104 surrounds the groove 132 on the front surface of the lower substrate 102 as compared with the surface light source device shown in FIGS. 3 and 4. Except for the same components, the same components as in FIGS. 3 and 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the surface light source device shown in FIGS. 14 and 15, the first electrode 104 is formed to surround the second electrode 108 so that a discharge path in the discharge region A is circumferentially around the second electrode 108. Will appear as a type. That is, in the fifth embodiment, the discharge paths are shown in a columnar shape as in the second to fourth embodiments of the present invention.

Here, the second electrode 108 may be located correspondingly at the rear surface of the groove 132, or may be located in the groove 132 as shown in FIG. 16. When the second electrode 108 is located in the groove 132 as shown in FIG. 16, the dielectric layer 106 is formed to cover the second electrode 108.

As described above, the surface light source device according to the embodiment of the present invention includes at least one or more electrode pairs consisting of first and second electrodes positioned on different planes, and the discharge area A which can be independently driven has a matrix. Arranged in the form. As a result, light sources having different sizes can be supplied to the flat panel display elements corresponding to the respective discharge regions A, thereby enabling individual luminance control.

On the other hand, the position of the first electrode (or anode electrode) and the second electrode (or cathode electrode) shown in the embodiments of the present invention may be interchanged with each other, the formation form of the first and second electrodes (104, 108) Is formed in a spiral (spiral) can maximize the amount of discharge.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but these are exemplary, and various modifications and equivalent other embodiments are possible from those skilled in the art to which the present invention pertains. You can see the point well. Such variations are apparent to those skilled in the art. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The surface light source device having the surface-division luminance control function of the present invention as described above includes at least one electrode pair composed of first and second electrodes positioned on different planes and can be independently driven. This is arranged in matrix form. As a result, light sources having different sizes can be supplied to the flat panel display elements corresponding to the respective discharge regions, thereby enabling individual luminance control.

Claims (23)

delete Discharging regions having an electrode pair consisting of first and second electrodes located on different planes and independently of which drive control is arranged in a matrix form; A lower substrate having a plurality of grooves arranged in a matrix on a front surface thereof; An upper substrate facing the lower substrate with a discharge space therebetween; And the first electrode is located in an area excluding the groove, and the second electrode is positioned to correspond to the groove. The surface light source device of claim 2, wherein the first electrode is formed to surround the groove and the second electrode on a front surface of the lower substrate. 4. The surface light source device according to claim 3, wherein the second electrode is located correspondingly in the groove. The surface light source device of claim 3, wherein the second electrode is formed on a rear surface of the lower substrate and is positioned to correspond to the groove. 3. The surface light source device according to claim 2, wherein the groove is circular. 3. The surface light source device of claim 2, wherein the second electrode is located correspondingly in the groove. The surface light source device of claim 2, wherein the second electrode is formed on a rear surface of the lower substrate and is positioned to correspond to the groove. 3. The surface light source device according to claim 2, wherein the groove is formed in a donut shape, and the first electrode is located in a protruding region at the center of the groove. 10. The surface light source device according to claim 9, wherein the second electrode is located correspondingly in the groove. 10. The surface light source device of claim 9, wherein the second electrode is formed on a rear surface of the lower substrate and is positioned to correspond to the groove. Discharging regions having an electrode pair consisting of first and second electrodes located on different planes and independently of which drive control is arranged in a matrix form; A lower substrate including donut-shaped first grooves arranged in a matrix shape on a front surface thereof and a second groove formed on a rear surface thereof in a central region of the first groove; An upper substrate facing the lower substrate with a discharge space therebetween; And the second electrode is located to correspond to the first groove, and the first electrode is located in the second groove. The surface light source device of claim 12, wherein the second electrode is disposed to correspond to each other in the first groove. The surface light source device of claim 12, wherein the second electrode is formed on a rear surface of the lower substrate and is positioned to correspond to the first groove. Discharging regions having an electrode pair consisting of first and second electrodes located on different planes and independently of which drive control is arranged in a matrix form; A lower substrate including donut-shaped first grooves arranged in a matrix shape on a front surface thereof and including a second groove formed in a central region of the first groove; An upper substrate facing the lower substrate with a discharge space therebetween; And the second electrode is located to correspond to the first groove, and the first electrode is located in the second groove. 16. The surface light source device according to claim 15, wherein the second electrode is located correspondingly in the first groove. The surface light source device of claim 15, wherein the second electrode is formed on a rear surface of the lower substrate and is positioned to correspond to the first groove. The surface light source device of claim 15, wherein a depth of the first groove is formed to be relatively deeper than a depth of the second groove. 12. The surface light source device according to any one of claims 2 to 11, wherein the first and second electrodes are formed in a spiral form. delete delete The surface light source device according to any one of claims 12 to 14, wherein the first and second electrodes are formed in a spiral form. 19. The surface light source device according to any one of claims 15 to 18, wherein the first and second electrodes are formed in a spiral form.

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