KR101531957B1 - Surface Emitting Device With Divided Region - Google Patents

Abstract

In the present invention, a plurality of flat panel-divided lamps capable of independent driving are arranged to form a surface light source lamp. More specifically, the present invention includes a lamp body for emitting light by emitting light in a discharge space and an electrode for applying a discharge voltage to the lamp body And at least one split flat lamp is provided. And voltage applying means for grounding one of the electrodes forming the divided flat lamp and enabling independent driving of each divided flat lamp. In particular, the discharge space can be formed by further including a discharge space dividing part for dividing the internal discharge space of the above-described split flat lamp.

According to the present invention, at least one independent flat plate lamp is provided, independent electrodes and voltage applying means are formed in each of the divided flat plate lamps, and a flow portion of the gas is formed independently, dimming drive) and gas flow structure to reduce power consumption, improve contrast ratio, and eliminate motion blur.

Plate split lamp, Tiling, Ground electrode

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a surface light source lamp,

The present invention relates to a surface light source lamp. In forming a single surface light source lamp, at least one independent flat plate lamp capable of independent driving is provided and tiled. Furthermore, since independent electrodes and voltage applying means are formed in each of the divided flat panel lamps, and the flow portion of the gas is formed independently, independent independence of luminance limiting driving (dimming driving) and gas distribution structure for each divided flat plate lamp can be realized, To improve a contrast ratio and to eliminate a motion blur.

LCD is a non-light emitting type electronic display device, which requires a light source having excellent characteristics in order to realize a vivid natural color of a moving picture with good quality, and a backlight is called a light source of an LCD.

In particular, a backlight unit (BLU) is a composite of a power supply circuit for driving a light source including all the light sources itself, and an accessory for uniformly emitting planar light, in order to irradiate light from the rear surface of the liquid crystal module. The LCD backlight uses a cold cathode fluorescent lamp (CCFL) as a light source. In applying the CCFL as an LCD backlight, there are a direct light type in which a plurality of cold cathode fluorescent lamps are mounted under the liquid crystal panel and a diffusion plate is provided between the cold cathode fluorescent lamp and the liquid crystal panel, And an edge light method in which light emitted from the cold cathode fluorescent lamp is distributed over the entire LCD screen by using a transparent light guide panel has been mainly used.

However, in the above-mentioned methods, due to the occurrence of light loss, the light utilization efficiency is low, the overall structure is complicated, and the production cost is high. In addition, since the uniformity of luminance is limited, the entire lower surface of the light- The use of a flat backlight in the form of a surface discharge type plasma discharge lamp or an opposite discharge type plasma lamp is also increasing.

In order to make a flat panel lamp, a flat plate glass plate is heated by using a mold designed to be processed to have a plurality of discharge spaces separated from each other by a partition wall and communicating with a discharge passage, And a discharge space is formed on a flat glass plate. A molded glass plate on which a discharge space is formed is taken out of the mold and gradually cooled. The phosphor is coated on the inside of the discharge space of the formed glass plate and fired. The front cover and the molded glass plate are bonded to each other with a front cover interposed therebetween. Vacuum is exhausted from the inside of the discharge space, a discharge gas is injected to seal the exhaust pipe, and an electrode for applying a high frequency power to the discharge space is provided.

The flat panel lamp has a structure in which a discharge gas and a discharge electrode are provided in a sealed discharge space between a front plate and a back plate that maintain a predetermined interval. Specifically, a plurality of partition walls are provided between the front plate and the rear plate opposed to each other. (Ne, Ar, etc.) and a small amount of mercury (Hg) are injected into the discharge space, and the discharge gas is supplied with a voltage Electrodes are provided on the outside or inside of both side edges of the substrate. Such a flat lamp generates a plasma discharge caused by a discharge gas by applying a voltage to an internal electrode to generate high-temperature electrons that excite atoms and molecules of the neutral gas. When atoms and molecules excited by these electrons fall to a ground state Ultraviolet rays are generated, and this ultraviolet ray excites a phosphor coated on the inner wall of the discharge space to thereby generate visible light therefrom.

1, a conventional planar light source lamp, that is, a flat panel lamp, includes a light source body 1 and electrodes 4 provided on both sides of the outer circumferential surface of the light source body 1. As shown in FIG. The light source body 1 includes first and second substrates (not shown) arranged to face each other at a predetermined interval. A plurality of barrier ribs 2 are disposed between the first and second substrates to divide the space between the first and second substrates into a plurality of discharge spaces 5. A sealing member (3) is disposed between the edges of the first and second substrates to isolate the discharge spaces (5) from the outside. A discharge gas is injected into the isolated discharge space (5). Further, a transfer passage 6 of the discharge gas may be formed between the partition 2 and the sealing member 3. [

However, in this case, since the path is substantially orthogonal to the longitudinal direction of the discharge space, the current is suddenly moved to the other discharge space, and the current drift phenomenon is very severe. In order to overcome this problem, a passageway for allowing the discharge gas to flow into each of the discharge spaces is formed in the partition wall, and the passageway is also provided with an inclined arrangement with respect to the longitudinal direction of the partition wall.

In the case of a flat panel lamp having such a structure, a voltage is applied to an electrode to emit light in such a manner as to realize a discharge. Specifically, the brightness of the entire region of the image signal is controlled by adjusting the brightness of the entire lamp Thereby realizing a light emitting mode. However, this driving method results in a reduction of the contrast ratio. This is because the contrast ratio of CCFL and EEFL, which are competitive products of flat lamps, is more than 4000: 1, but the contrast ratio of these flat lamps is only 800: 1 Respectively.

In the case of driving by the above-mentioned flat panel lamp driving method, the power consumption is increased, the precision of the contrast adjustment is decreased, and the image quality and sharpness are deteriorated. In addition, when the brightness of the entire image signal is adjusted by adjusting the brightness of the entire lamp, the problem of the occurrence of a residual blur occurs.

It is an object of the present invention to provide a surface light source lamp having at least one independent divided flat panel lamp and having independent electrodes for each divided flat panel lamp, And the gas distribution portion is independently formed to realize the independence of the luminance limitation driving (dimming driving) and the gas distribution structure for each divided flat plate lamp, thereby lowering the power consumption, improving the contrast ratio, Motion Blur).

Further, it is another object of the present invention to enable the mercury to be formed adjacent to the ground electrode portion so that the problem of uneven distribution of mercury in each divided flat lamp can be solved.

In order to solve the above-described problems, the present invention provides a flat fluorescent lamp, comprising at least one divided flat lamp including a lamp body for emitting light in a discharge space and emitting an electric discharge voltage to the lamp body, Provide a lamp. And voltage applying means for grounding one of the electrodes forming the divided flat lamp and for enabling independent driving of the divided flat lamps. In particular, the discharge space can be formed by further including a discharge space dividing part for dividing the internal discharge space of the above-described split flat lamp.

According to the present invention, at least one independent flat plate lamp is provided, independent electrodes and voltage applying means are formed in each of the divided flat plate lamps, and a flow portion of the gas is formed independently, dimming drive) and gas flow structure to reduce power consumption, improve contrast ratio, and eliminate motion blur.

The present invention provides a surface light source lamp having at least one or more split flat lamps including a lamp body for emitting light in a discharge space and an electrode for applying a discharge voltage to the lamp body, The lamps are formed as a combination of two or more independent lamps, enabling independent driving for each divided flat panel lamp, thereby improving contrast ratio, improving image quality, and reducing power consumption.

In addition, the present invention provides a surface light source lamp characterized in that each of the divided flat plate lamps has a uniform or non-uniform area, thereby providing a combined body of a surface light source lamp capable of independent driving of various structures.

According to another aspect of the present invention, there is provided a surface light source lamp, wherein the electrode comprises a first electrode portion and a second electrode portion formed at both ends of the divided flat panel lamp, Particularly, in the case of single-pole type, the actual power consumption can be reduced compared with the case of both sides.

The present invention also provides a surface light source lamp having at least one of the electrodes grounded so as to be driven in a single direction. The present invention provides a surface light source lamp capable of driving a voltage through only one electrode, And further, the inverter required for driving can be simplified so as to reduce manufacturing and operating costs.

The present invention also provides a surface light source lamp having a grounded electrode that is wider than an ungrounded electrode. The grounded light source lamp includes a grounding electrode, which is likely to be generated by a voltage continuously applied to the grounded electrode from an ungrounded electrode, So that the interference phenomenon can be minimized.

Further, in the present invention, the surface light source lamp may further include voltage applying means including an electrode connection portion and an inverter, so that the independent divided plate lamps can be independently driven .

Further, the present invention is characterized in that the voltage applying means is independently formed in each of the divided flat lamps, thereby enabling independent driving of the independent divided flat lamps.

Also, the present invention provides a surface light source lamp, wherein at least one of the first and second electrode units is connected to the voltage applying unit.

In addition, the present invention provides a surface light source lamp having at least one mercury transfer prevention part formed in the discharge space, wherein mercury is poured from a single-side driving type surface light source lamp to which the electric field is applied, So that the efficiency of the surface light source lamp can be increased by improving the light efficiency and eliminating the uneven distribution of the mercury.

According to the present invention, the mercury movement prevention part is a convex dot pattern formed on the upper surface of the lower substrate of the surface light source lamp, and prevents the mercury from being pushed to the ground part of the surface light source lamp It is possible to increase the efficiency of the surface light source lamp by eliminating uneven distribution of mercury.

The present invention also provides a surface light source lamp characterized in that the mercury movement preventing portion is formed adjacent to the grounded electrode portion, thereby preventing mercury from being poured from the surface light source lamp of the single- .

According to another aspect of the present invention, there is provided a surface light source lamp including a discharge space division unit dividing a discharge space of the divided flat lamp into at least one discharge division region, So that the contrast ratio can be improved, the image quality can be improved, and the power consumption can be reduced.

In addition, the present invention provides a surface light source lamp characterized in that the widths of the discharge dividing regions are uniform or non-uniform, thereby enabling various manufacturing methods to be provided.

The discharge space divider may be formed in the long axis direction or the short axis direction of the divided flat lamp. The present invention can provide a variety of manufacturing methods of the surface light source lamp.

According to another aspect of the present invention, there is provided a surface light source lamp, wherein the discharge space dividing unit has a first groove penetrating each of the discharge divided areas, thereby facilitating gas movement between the respective discharge spaces.

According to another aspect of the present invention, there is provided a surface light source lamp, wherein an exhaust line communicating with each discharge division region is formed on an upper surface of a rim portion of the split flat lamp, Movement can be done.

Further, the present invention provides a surface light source device, wherein the surface light source lamp includes a gas flow portion in the divided flat lamp, so that the inflow and outflow of gas can be independently performed for each flat panel lamp.

Further, the present invention provides a surface light source device characterized in that the gas flow portion comprises a gas inlet or a gas outlet.

In addition, the present invention provides a surface light source device in which the gas inlet and the gas outlet are integrally formed, so that a gas flow portion having a simpler structure can be formed.

Hereinafter, the structure and operation of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 2, FIG. 2 schematically shows a structure of a surface light source lamp of the present invention and a divided flat plate lamp constituting the same.

Referring to a plan view of the surface light source lamp having the upper substrate and the lower substrate (not shown) on the upper part thereof, the divided flat plate lamp 100 constituting each unit flat plate lamp may be arranged as a tile Tiling) to complete a single surface light source lamp. The divided flat lamp 100 having the upper substrate and the lower substrate includes a lamp body formed of the divided flat lamp borders 30, 40 and 50, and a discharge space is provided therein to independently emit light do.

Each of the divided flat lamps 100 may be tiled to have a uniform size as shown in the drawing. Alternatively, the divided flat lamps 100 may be arranged in different sizes.

Particularly, the divided flat lamp of the present invention can form an electrode so as to be able to drive independent voltages at both ends thereof. For the sake of convenience, one side is formed of a first electrode 70a and a second electrode 70b, Can be separately formed in the split flat lamp. In addition, it is preferable that each of the electrodes is formed with voltage applying means (not shown) capable of applying independent power, and the electrode connecting portion and the inverter are provided so as to independently apply a voltage to each electrode.

Particularly, it is preferable that each of the divided flat lamps has a grooved tube portion 80 formed therein. The gas discharge portion can independently form the gas discharge port 80a and the gas discharge port 80b in the unit discharge division region or the gas discharge port 80a and the gas injection port 80b formed in each unit discharge division region They may be integrally formed and formed into a single hole.

The divided flat lamp of the present invention will be described in detail with reference to FIG.

The divided flat panel lamp is preferably a stand-alone lamp that constitutes the surface light source lamp of the present invention, and each of the divided flat panel lamps can be driven by one lamp. The split plate lamp includes an upper substrate 10 and a lower substrate 20, and a first electrode and a second electrode 70a and 70b are formed on the upper substrate. Of course, the position of the electrode may be formed on the upper surface of the upper substrate or the lower surface of the lower substrate. One discharge space may be formed in the inner space of the lamp body frame portions 30 and 40 forming the lamp body. More preferably, the discharge space partitioning portion 50 may be formed into a smaller discharge division region 31 The discharge space can be subdivided. As shown in the figure, the intervals of the bank division regions can be formed at uniform intervals, and the intervals can be non-uniformly arranged.

The size of the discharge division region formed by the discharge space division unit 50 may also be formed differently. Hereinafter, the present invention will be described with reference to a structure having a predetermined standard as shown in FIG. (In addition, it is possible to divide the discharge area in the vertical and horizontal directions. Further, the division of the discharge area can be also divided into diagonal directions of the surface light source lamp or divided into curved shapes.

An exhaust line (41) may be formed on the upper surface of the rim portion (40) of the lamp body for smooth gas transfer or exhaust gas flow between the respective discharge division regions, and a through- (42). In particular, the through-hole 42 may be formed at the uppermost part of the rim of the lamp body, but it may be formed at the center or the lower end of the rim of the lamp body. In this case, Is formed to a depth at which it is formed.

In addition, the first grooves 60 passing through the respective discharge division regions are formed in the respective discharge space division portions 50, so that gas movement between the respective discharge division regions can be performed smoothly. The formed position may be formed at any of the uppermost, middle, and bottom portions of the discharge space division. It is a matter of course that the arrangement of the first grooves 60 formed in the respective discharge space dividing portions may be regularly or irregularly formed in a certain direction as shown in the figure.

The split tubular lamp may be provided with a clearance tube portion 80, respectively. The gas discharge portion can independently form the gas discharge port 80a and the gas discharge port 80b in the unit discharge division region or the gas discharge port 80a and the gas injection port 80b formed in each unit discharge division region Or may be integrally formed and formed into a single hole.

The discharge division region can prevent the phenomenon that the mercury is attracted to the vicinity of the specific electrode by providing the upwardly projecting portion D of mercury in the discharge division region. This can prevent the uneven distribution of mercury in the single- do.

Referring to FIG. 3B, the structure of applying the voltage to the electrode according to the present invention and the structure and action of the mercury-free copper portion will be described in detail. Fig. 3b schematically shows a plan view of the split flat lamp.

The inside of the unit split flat lamp according to the present invention is divided into a discharge divided area by the discharge space dividing unit 50 and the first and second electrodes 70a and 70b are provided on both sides of the divided flat lamp, And a voltage applying means can be connected to one of them. The voltage application means includes an electrode connection part connected to the electrode and an inverter 90.

In particular, a voltage may be applied to any one of the first and second electrodes 70a and 70b, and one of them may be grounded. This is because when at least one of the electrodes formed on both sides of the split flat lamp is grounded (referred to as one-side driving), the ungrounded electrode 70b serves to apply a voltage, The electrode does not function as a voltage application but merely serves to receive charges flowing from the opposite electrode in a grounded state. In other words, only one of the electrodes is directly driven, and the other grounded electrode only serves to receive the charge. Therefore, when the single-side driving is performed through the ground, only one electrode affects the driving. As a result, it is possible to realize an effect of reducing the actual power consumption as compared with the both-side driving method of applying the voltage to both side electrodes do. This simplifies the inverter required for driving and also has the advantage of reducing manufacturing and operating costs.

In particular, in this case, the electrode 70a to be grounded is preferably formed wider than the non-grounded electrode. This is because, as the voltage is continuously applied to the grounded electrode side, an interference phenomenon may occur in the discharge space of the other divided flat plate lamp adjacent to the grounded electrode side. Therefore, the width of the electrode of the grounded portion is widened, So that interference can be blocked.

Referring to FIG. 4A, the formation of the mercury transfer prevention part in the structure of the present divided flat lamp having the grounded electrode will be described in detail. Figure 4a also schematically shows a plan view of a split planar lamp.

The inner space of the divided flat lamp is divided into a discharge divided area by the discharge space division part 50. A first electrode 70b and a second electrode 70a are formed on both sides of the inner space, (Inverter) 90, and the second electrode 70b is grounded.

In the case of the single-electrode connection, the voltage is applied only in one direction, so that the mercury is poured into the grounded second electrode, which receives only the charge. This causes an uneven distribution of mercury and lowers the light efficiency. Therefore, in the present invention, at least one or more of mercury (D) is formed in the inside of the discharge dividing region. The above-described mercury movement preventing section can be disposed anywhere within the discharge dividing region, more preferably, The mercury movement preventing portion may be formed in a convex dot pattern as shown in FIG. 4A.

This prevents the phenomenon that the dot pattern itself acts as a blocking wall and the mercury is pushed to the ground electrode portion. Specifically, the mercury movement preventive portion formed by the dot pattern is bulkier than the bottom layer, and accordingly, when the electric field is applied and then turned off, the temperature is slowly lowered relatively. Since mercury generally moves to a lower temperature side, mercury having relatively higher temperature than the bottom layer moves only toward the bottom layer without moving over the upper edge portion (dot pattern). As a result, mercury accumulates substantially at the interface between the dot pattern and the bottom layer, thereby preventing the mercury from moving to the ground electrode portion.

The size of the surface light source lamp must necessarily be in view of the tendency of various display devices to be enlarged. In this case, it is also possible to arrange the surface light source lamp by arranging the discharge space vertically instead of horizontally can see. That is, in arranging the independent split flat lamps according to the present invention, the structure in which the discharge spaces shown in FIGS. 4A and 4B are laid laterally may be vertically arranged.

However, in the case of the surface light source lamp including mercury, the liquefied mercury moves to the lower portion along the discharge space, and when the lamp is intended to be lit, the mercury is gathered in one direction. As a result, There arises a problem that the discharge characteristic is lowered.

Specifically, since the discharge spaces are vertically formed, when the mercury injected into the discharge spaces is in a liquefied state (when the surface light emitting device is turned off), the liquefied mercury is discharged to the lowermost space of the discharge spaces .

When the liquefied mercury is pumped to the lowermost end of the discharge spaces, the mercury is located at a lower level than the electrodes. Therefore, even when the surface light emitting device is turned on by applying power to the electrodes, do.

Especially, when the mercury is in a liquid state at room temperature and the discharge space is in the vertical shape, when the TV is turned on, the mercury drops down to the lower part, and the mercury gradually evaporates up, As a result, the liquefied mercury is trapped at the lowermost end of the discharge spaces, the mercury in the discharge spaces is depleted, and the lifetime of the surface light emitting device is ended.

However, when the upwardly projecting portion D of the mercury according to the present invention is formed, the gradual movement of the mercury gradually downward due to the temperature difference of the protruding portion can be intercepted and held, To be evenly distributed. If the mercury is evenly distributed throughout the lamp, even though the discharge space of the lamp is vertically erected, the bottom and top of the discharge space are turned on at the same time. In this case, it is also possible to form at least one or more of mercury in the middle of the discharge space instead of forming the upwardly projecting portion only on the ground electrode side. This makes it possible to prevent the mercury from moving downward.

Therefore, in the present invention, a mercury movement prevention unit is formed in each of the discharge spaces to prevent the liquefied mercury from moving to the lowermost end of the discharge spaces and being isolated. The mercury transfer prevention part can be formed in each of the discharge spaces. Further, even when the divided flat plate lamps having such a structure are independently formed by tiling, various arrangements such as a structure in which discharge spaces are arranged horizontally or vertically arranged And it is possible to maximize the light efficiency while enabling various arrangements.

In particular, although the dot pattern is called as the dot pattern in this embodiment, the structure D having a convex structure may be formed as shown in FIG. 4B. In a further extension, the convex shaped structure or the neighboring discharge space division forming the discharge division region may be formed in a partition shape within a range that does not completely block the neighboring discharge space division portions forming the discharge division region, It is also possible to produce. That is, it is also possible to form a barrier that vertically blocks the neighboring discharge space division, but it is also possible to form a passage and form a gas transfer structure.

However, in the present invention, both side driving methods, that is, the right and left electrodes serve as an electrode, so that a current flows from left to right and flows from right to left. Of course, be formed. In this case, it is possible to implement a two-sided driving method in which electric fields are applied in both directions between the electrodes formed at the left and right ends of the divided flat lamps, and alternately driven in the on-off state of the voltage If the conventional planar light source increases the power consumption due to the continuous application of the voltage and the afterimage phenomenon increases, it is possible to reduce power consumption the effect of improving the contrast ratio can be realized.

In summary, the independent limited discharge area and the independent electric field application structure structurally enable luminance limited driving for each discharge area, thereby lowering the power consumption, increasing the contrast ratio, and solving the afterimage phenomenon.

The surface light source lamp having the above-described configuration can be used as a light source of a backlight unit used in various display devices and various lighting devices. Further, the surface light source lamp having the above-described configuration can be used in various display devices and various lighting devices. In particular, the above-described surface light source lamp can be applied to a liquid crystal display device and used as a light source.

The foregoing detailed description of the invention has been presented for specific embodiments. However, various modifications are possible within the scope of the present invention. The technical idea of the present invention should not be limited to the embodiments of the present invention but should be determined by the equivalents of the claims and the claims.

1 is a schematic view showing a configuration of a conventional surface light source lamp.

FIG. 2 is a plan view showing a surface light source lamp formed by tilting a split plate lamp capable of independent driving according to the present invention.

FIG. 3A is an enlarged view of a substantial part showing the configuration of an independent split flat lamp constituting the surface light source lamp according to the present invention.

FIG. 3B is a plan view schematically showing an electrode configuration of an independent split flat panel lamp constituting the surface light source lamp according to the present invention.

4A and 4B are plan views showing a configuration in which a mercury transfer prevention part is formed in the surface light source lamp according to the present invention.

Claims (19)

1. A plasma display panel comprising: a lamp body having a substrate and a discharge space spaced apart from each other; A discharge space partitioning part disposed in the lamp body and partitioning the discharge space into a plurality of discharge division areas; And an electrode for applying a discharge voltage to the lamp body, wherein the divided flat lamp comprises at least two divided flat lamps, Wherein at least one of the plurality of discharge dividing regions includes the upwardly projecting portion of mercury projecting from the inner surface of the substrate. The method according to claim 1, The mercury movement prevention unit may include: With reference to the center of the discharge division region, Wherein the electrode is disposed adjacent to the electrode. The method of claim 2, The electrode And a surface light source lamp disposed on an outer periphery of the substrate. The method according to claim 1, The electrode And a first electrode and a second electrode disposed on both sides of the divided flat lamp, Wherein one of the first electrode and the second electrode is grounded. The method of claim 4, Wherein the grounded electrode is wider than the ungrounded electrode. The method of claim 5, The surface light source lamp includes: Further comprising voltage applying means for applying a voltage independently to each of said divided flat lamps. The method according to any one of claims 1 to 6, And an exhaust line arranged in the longitudinal direction of the rim portion and communicating with the discharge division region. The method of claim 7, The exhaust line And a groove having a predetermined depth at an upper surface of the rim portion. The method of claim 8, And a through-hole communicating the exhaust line and the discharge division region. The method of claim 7, The discharge space divider may include: Wherein a first groove for communicating mutually adjoining discharge division regions is provided. The method of claim 10, The first groove Wherein the plurality of discharge space division parts are disposed at different positions of mutually adjacent discharge space division parts. delete The method of claim 7, Wherein the discharge division region has a non-uniform width. The method of claim 7, Each of the divided flat lamps having mutually different areas. The method of claim 7, Wherein the divided flat lamps include at least one object having a non-uniform area of each of the divided flat lamps. The method of claim 7, The mercury movement prevention unit may include: A surface light source lamp disposed on a lower substrate on which light is not emitted. The method according to any one of claims 1 to 6, Wherein the planar light source lamp further comprises a gas flow portion in the divided flat lamp. 18. The method of claim 17, Wherein the gas flow portion includes a gas inlet or a gas outlet. 18. The method of claim 17, Wherein the gas flow-through part is provided integrally with the gas inlet and the gas outlet.

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