KR100673318B1 - Surface light source having surface segmentation driving control function - 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 comprises: a plurality of first grooves arranged in a matrix form on the front surface of the first substrate; A plurality of second grooves arranged in a matrix so as to be non-overlapping with the first grooves on the rear surface of the first substrate; One of the first and second electrodes having different electrical characteristics may be selectively positioned in the second groove, and the discharge region may be divided by at least one first electrode and the second electrode with the first groove therebetween. Can independently drive control. Accordingly, each discharge region can be driven independently, so that the brightness can be controlled independently.

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 diagram showing a dividing and driving surface light source device according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view taken along line II-II ′ of FIG. 6.

8 is a perspective view illustrating an example in which a connection passage is formed between first grooves.

FIG. 9 is a cross-sectional view taken along line II-II ′ of FIG. 8.

* 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

24,114: upper phosphor 142: first groove

128: spacer 144: second groove

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. Such a liquid crystal display device displays an image corresponding to a video signal on a liquid crystal display panel in which liquid crystal cells are arranged in a matrix by adjusting light transmittance of liquid crystal cells according to a 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 way to satisfactorily solve 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 luminance control function.

According to an aspect of the present invention, there is provided a surface light source device having a surface division driving control function comprising: a plurality of first grooves arranged in a matrix form on a front surface of a first substrate; A plurality of second grooves arranged in a matrix so as to be non-overlapping with the first grooves on the rear surface of the first substrate; One of the first and second electrodes having different electrical characteristics may be selectively positioned in the second groove, and the discharge region may be divided by at least one first electrode and the second electrode with the first groove therebetween. Can independently drive control.

Preferably, the first groove has a shape of either circular or polygonal.

Preferably, the first groove and the second groove are alternately arranged with each other in a diagonal direction.

Preferably, the first and second electrodes are alternately arranged in a diagonal direction.

Preferably, the first groove is formed in the shape of a cross.

Preferably, the first and second electrodes are arranged such that electrodes having the same electrical characteristics in the diagonal direction are located.

Preferably, the first and second electrodes are arranged such that electrodes having different electrical characteristics in the transverse and column directions are located.

Preferably, the discharge gas injected into the discharge region is formed by mixing one or more types of discharge gases of He, Ne, Ar, Kr, Xe, and Hg.

Preferably, the apparatus further includes a second substrate positioned to face the first substrate with the discharge space therebetween.

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

Preferably, the space provided by the matrix-shaped first grooves partitions the discharge region.

Preferably, a plurality of first grooves arranged in a matrix form on the front surface of the first substrate are connected to the first substrate such that a plurality of first grooves are connected to each other between neighboring first grooves.

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 includes a plurality of first grooves 142 arranged in a matrix form on the front surface of the lower substrate 102, and the first grooves 142 on the rear surface of the lower substrate 102. A plurality of second grooves 144 arranged in a matrix so as to be non-overlapping with each other, and the first and second electrodes (or anode electrodes and cathode electrodes) having different electrical characteristics in the second grooves 144 (104,108). Is selectively positioned, and the discharge region A, which is partitioned by the at least one first electrode 104 and the second electrode 108 with the first groove 142 therebetween, is independently driven. do. That is, by controlling the amount of power supplied to the first and the first electrode 104, 108 independently, each discharge region (A) can be individually controlled brightness. As a result, light sources having different sizes can be supplied to the flat panel display elements corresponding to the respective discharge regions A, and thus, each discharge region A can be supplied according to the characteristics of the display image of the flat panel display element. Independent brightness control is possible for each.

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 present invention, the surface light source device is positioned such that the upper substrate 122 and the lower substrate 102 face each other with a discharge space in which an inert gas, for example, xenon (Xe) or argon (Ar) is injected, is interposed. do. Alternatively, the discharge gas injected into the discharge region may be formed by mixing one or more types of discharge gases of He, Ne, Ar, Kr, Xe, and Hg.

The lower substrate 102 has a plurality of first grooves 142 arranged in a matrix form on its front surface, and a plurality of first grooves 142 arranged in a matrix form so as not to overlap the first groove 142 at the rear surface of the lower substrate 102. One of the first and second electrodes 104 and 108 having different electrical characteristics may be selectively disposed in the second groove 144 and the second groove 144, and the lower substrate 102 on which the first groove 142 is formed. The lower phosphor 112 is formed on the front surface, and a reflecting plate 124 is formed on the lower substrate 102 to reflect the light emitted by the discharge toward the upper substrate 122.

The first groove 142 is formed in a circular or polygonal shape to serve as a dividing discharge area A, and the second groove 144 provides a space in which the first and second electrodes 104 and 108 can be located. Serves to provide. The first and second grooves 142 and 144 are alternately arranged with each other in a diagonal direction.

The first and second electrodes 104 and 108 are optionally formed to be buried in the second groove 144 and are arranged such that different electrodes are alternately positioned in a diagonal direction. When the voltage is supplied to the first and second electrodes 104 and 108, the ultraviolet rays generated when the inert discharge gas in the discharge space discharges emit light to the liquid crystal display panel by emitting the upper and lower phosphors 114 and 112. .

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

Each of the first electrodes 104 and the second electrodes 108 in the surface light source device having the structure is formed to be electrically separated from each other, so that each of the first electrodes 104 and the second electrode 108 is formed. Each of these can be driven separately. Accordingly, as shown in FIG. 4, individual discharge may be performed between one first electrode 104 and one second electrode 108, and thus a plurality of independent discharge regions A may be provided. .

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.

Example 2

FIG. 6 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 exemplary embodiment of the present invention. FIG. 7 is a cross-sectional view taken along line II-II ′ of FIG. 6. .

In the surface light source device shown in FIGS. 6 and 7, the first grooves 142 arranged in the form of a matrix are formed in a cross shape and each cross-shaped material is formed in comparison with the surface light source devices shown in FIGS. 3 and 4. The same components as in FIGS. 3 and 4 are given the same components except that four second grooves 142 are arranged at adjacent distances of the first groove 142. It will be omitted.

That is, in the surface light source device illustrated in FIGS. 6 and 7, the first grooves 132 are formed in a cross shape. As a result, the space of the discharge area A which can be driven independently becomes larger as compared with the first embodiment of the present invention.

Four second grooves 142 are positioned in an adjacent area of each of the first grooves 142, and two first electrodes 104 and two second electrodes 108 are disposed in the four second grooves 144. ) Can be landfilled.

In this case, the first and second electrodes 104 and 108 are arranged adjacent to each other in the horizontal and column directions, and the same electrodes are arranged in the diagonal direction, and the first and second electrodes 104 and 108 are arranged between the first and second electrodes 104 and 108. 1 groove 142 is partially located.

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.

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.

Except for the above-mentioned matters, the second embodiment of the present invention has the same components and effects as those described in the first and second embodiments of the present invention.

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.

FIG. 8 is a perspective view illustrating an example in which connecting passages are formed between first grooves, and FIG. 9 is a cross-sectional view taken along line II-II ′ of FIG. 8.

8 and 9, the plurality of first grooves 142 arranged in a matrix form on the front surface of the lower substrate 102 are connected to the lower substrate 102 such that the first grooves 142 are adjacent to each other. Passage 160 may be configured. In this case, as shown in FIG. 9, the upper substrate 122 may be mounted on the front surface of the lower substrate 102 without a spacer. In this case, since the spacer does not need to be provided, the overall thickness can be reduced.

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 has a plurality of first grooves arranged in a matrix form on the front surface of the lower substrate, and a matrix form so as not to overlap the first groove on the rear surface of the lower substrate. And the discharge region partitioned by a plurality of second grooves in which the first and second electrodes are selectively buried can be independently driven. 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 (12)

A plurality of first grooves arranged in a matrix on the front surface of the first substrate; A plurality of second grooves arranged in a matrix so as to be non-overlapping with the first grooves on the rear surface of the first substrate; One of the first and second electrodes having different electrical characteristics is selectively positioned in the second groove, And a discharge region partitioned by the at least one first electrode and the second electrode with the first groove interposed therebetween, and having a surface division driving control function capable of driving control independently. The surface light source device of claim 1, wherein the first groove has a plane split driving control function having one of a circular shape and a polygon shape. The surface light source device of claim 1, wherein the first grooves and the second grooves have a surface division driving control function alternately arranged in a diagonal direction. The surface light source device of claim 1, wherein the first and second electrodes have a surface division driving control function alternately arranged in a diagonal direction. The surface light source device of claim 1, wherein the first groove has a cross-sectional driving control function formed in a cross shape. 6. The surface light source device of claim 5, wherein the first and second electrodes have a plane division driving control function arranged such that electrodes having the same electrical characteristics in a diagonal direction are positioned. 6. The surface light source device of claim 5, wherein the first and second electrodes have a plane-division driving control function arranged such that electrodes having different electrical characteristics are positioned in the transverse and column directions. The surface light source device of claim 1, wherein the discharge gas injected into the discharge region comprises a surface-division driving control function configured by mixing at least one type of discharge gas among He, Ne, Ar, Kr, Xe, and Hg. The surface light source device of claim 1, further comprising a second substrate positioned to face the first substrate with a discharge space therebetween. The surface light source device of claim 1, wherein the first and second electrodes have a surface division driving control function formed in a spiral form. The surface light source device of claim 1, wherein the space provided by the first grooves in the matrix form has a plane division driving control function for partitioning a discharge region. According to claim 1, The plurality of first grooves arranged in a matrix form on the front surface of the first substrate has a surface-dividing drive control function that the connection passage is configured in the first substrate to be connected to each other between the adjacent first grooves Having a surface light source device.

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