KR20020091419A - Area lamp apparatus - Google Patents

Abstract

PURPOSE: A surface light source apparatus is provided to improve the luminance and luminescent efficiency by using a hollow electrode of a complicated shape as a side electrode and a gap electrode. CONSTITUTION: A back substrate(3) has at least one floor in order to form at least one rectangular channel with a front substrate(1). A partial zone of the floor is joined and layered with the front substrate(1). A fluorescent substance is applied to at least one part of an opposite surface of the front substrate(1) and the back substrate(3). An electrode unit is provided to both sides of a joining body of the front substrate(1) and the back substrate(3) to apply the power. A nonactive gas is put in the channel zone. A reflecting layer is provided between the fluorescent substance and the back substrate(3) to reflect the light.

Description

Surface light source device {AREA LAMP APPARATUS}

The present invention relates to a structure of a surface light source device using gas discharge, and more particularly, to a surface light source device constituting a planar light source of a type in which a plurality of fluorescent channels are contained in a single glass substrate.

The surface light source device is widely used as a light source of a liquid crystal display and is expected to be extended to general lighting in the future. A surface light source device having a general structure according to the prior art is shown in FIG. Referring to the drawings, (a) of FIG. 1 shows a plurality of fluorescent lamps (Fluorescent Lamps) composed of glass tubes arranged side by side, and a reflecting layer reflecting light diffused to the back surface to the front and an object to evenly scatter the light on the front surface. Diffusion plate is installed. In the configuration of the fluorescent tube, the phosphor is coated on the inside of the glass tube, argon gas and mercury are enclosed in the interior space, and metal electrodes are located at both ends of the tube. Another example of improving such a configuration is FIG. 1B. The feature of this structure is not to form a surface light source by arranging a plurality of fluorescent tubes, but to form a single container with a glass substrate and to insert a U-shaped metal electrode therein.

The problem of the conventional surface light source device is as follows. In the form of (a) of FIG. 1, an additional component cost and an assembly cost are required because a reflective layer and a diffusion plate are required to secure luminance uniformity. In addition, in the form as shown in (b) of FIG. 1, although it has the advantage of an integrated type, since the phosphor is coated on a flat surface, it is disadvantageous to obtain a high luminance and efficiency due to the small coating area. There was a hassle to go through a number of processes because it must be fixed. Complex problems that must be considered in reality are: Processes and materials are required for fixing the metal electrodes to a container made of glass, and strict process control is required to accurately secure the distance between the electrodes, which directly affects the discharge characteristics.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a surface light source device having high brightness and high light emission efficiency and at the same time lowering the cost.

To this end, the present invention, by forming a plurality of channels in the form of channels on a glass substrate to form a plurality of light emitting channels by applying a phosphor on the inner surface, and the front substrate and the both sides of the front substrate is coated with a phosphor layer thereon Each of the electrode substrates is hermetically sealed to form a container, and a surface light source device having a simple structure in which an inert gas is enclosed therein can be configured.

1 is a surface light source device according to the prior art.

Figure 2 is a perspective view showing an embodiment of a surface light source device proposed in Korean Patent No. 2000-002699 filed by the inventor.

3 is a cross-sectional structure of the ga-ga 'and i-na' direction of FIG.

4 is a detailed configuration diagram of the side electrode substrate of FIG.

Figure 5 is a side electrode substrate configuration of the second embodiment proposed in Korean Patent No. 2000-002699 filed by the present inventor.

Figure 6 is a perspective view of a third embodiment proposed in Korean Patent No. 2000-002699 filed by the inventor.

7 is a perspective view of a fourth embodiment proposed in Korean Patent No. 2000-002699 filed by the inventor.

8 is a perspective view of a fifth embodiment proposed in Korean Patent No. 2000-002699 filed by the inventor.

9 is a perspective view of the light source device of the first embodiment of the present invention.

10 is a perspective view of a surface light source device having an integrated channel as another embodiment of the present invention.

11 is a perspective view of a surface light source device using an insert electrode as another embodiment of the present invention.

12 is a perspective view of a rear substrate having a protrusion as another embodiment of the present invention.

FIG. 13 is a perspective view of a surface light source device to which the technical spirit shown in FIG. 12 is applied. FIG.

14 is a detailed view for explaining the arrangement of the protrusions formed on the floor portion.

15 to 17 are various electrode shapes that can be applied to the surface light source device of the present invention.

18 is an electrode configuration diagram showing various hollow electrode shapes.

<Description of the symbols for the main parts of the drawings>

1: front substrate 2: sealing material

3: back substrate 4: side electrode substrate

5 side electrode 6 dielectric layer

7 channel 8: phosphor layer

9 reflective layer 10 interelectrode substrate

11: MgO protective layer 12: interelectrode

13 electrode insertion groove 14 floor

15: protrusion

First of all, in order to solve the above problems, the applicant of the present invention is filed in advance and this will be briefly described with reference to Korean Patent Application No. 2000-002699, which is not yet known before the filing date.

2, 3 and 4 is a view showing a detailed structure of the first embodiment proposed in Korean Patent No. 2000-002699 filed by the present inventor. According to the drawing, the surface light source device of the present invention is composed of one front substrate 1, one back substrate and two side electrode substrates 4.

On the front substrate 1, a phosphor layer 8 is formed on the lower surface of the transparent substrate. On the back substrate 3, several channels 7 in the form of channels are made, and the shape of the channels generally has a round shape which is advantageous for light extraction. Each channel is coated with a phosphor layer 8, and ZrO2, BN, between the back substrate 3 and the phosphor layer 8, as shown in FIG. 3, to reduce the loss of light that escapes under the back substrate 3; The visible light reflection layer 9 in which TiO2 was a main component was provided. The side electrode substrate 4 serves to apply a voltage from the outside to the inside of the container, and its shape is as shown in FIG. 4. Referring to the drawings, a metal electrode 5 on the side electrode substrate 4 is formed by a sputtering method, a vacuum evaporation method, or a thick film printing method, and again thereon. The dielectric layer 6 is formed by thick film printing, and the magnesium oxide (MgO) protective layer 11 is formed by sputtering or vacuum deposition, which is the aforementioned thin film manufacturing method, for the purpose of lowering the discharge voltage and extending the life. do.

The side electrode substrate of the second embodiment of the surface light source device proposed in Korean Patent No. 2000-002699 filed by the present inventor is shown in FIG. 5. In this case, the side glass substrate 4 itself is used as the dielectric layer without separately manufacturing the dielectric layer 6. However, the thickness of the side substrate 4 at this time needs to be thinner than the thickness of the side glass substrate 4 applied to FIG. 4 so that the driving voltage is not excessively high.

When four glass substrates having the above configuration are sealed with the sealing material 2 to form a container, the container is in the form of a container as shown in FIG. 3, and then the inert gas is enclosed in the container through an exhaust process and a gas injection process. Complete the light source device. At this time, the type of gas encapsulated is preferably argon gas, mercury, neon gas, xenon gas, or the like.

The cross-sectional structure of the surface light source device proposed in Korean Patent No. 2000-002699 filed by the present inventor is shown in FIG. 3. FIG. 3 (b) is a cross section in a direction traversing the discharge channel of the surface light source device in a temporary-to- 'direction, and FIG. 3 (c) is a cross-sectional view of the direction' na-na 'in the longitudinal direction of the discharge channel of the surface light source device. .

Referring to the operation of the surface light source device having the structure as described above, a sine wave of several kilovolts (kilovolts) or a square wave of an alternating current is generated at both ends of the electrode 5 of FIG. When applied, discharge occurs in the gas space existing between the two electrodes 5 shown in the cross-sectional view of FIG. 3, and ultraviolet rays accompanying the discharge are applied to the surface of the channel 7 of the rear substrate 3 and the front substrate 1. The phosphor layer 8 attached to the lower surface of the excitation layer is excited to extract visible light.

6 shows a third embodiment of the surface light source device proposed in Korean Patent No. 2000-002699 filed by the inventor. In the case of the third embodiment, the channel-shaped grooves formed on the back substrate 3 are removed around the electrode 5 to secure sufficient gas space around the electrode 5 to increase plasma generation efficiency. have.

7 shows a third embodiment of the surface light source device proposed in Korean Patent No. 2000-002699 filed by the inventor. In the case of the third embodiment, the length of the discharge channel, that is, the distance between the electrodes 5 is long, so that the driving voltage is excessively increased, and the interelectrode is placed in the middle of the back substrate 3 in order to implement a large surface light source device. The feature is that the substrate 10 is inserted. The channel for inserting the interelectrode substrate 10 may be formed in at least one portion on the front substrate 1 or the rear substrate 10. In this case, the front substrate 1 and the rear substrate 3 may be formed with one insertion groove or a plurality of grooves for inserting a plurality of interelectrode substrates 10. FIG. 7 illustrates a structure in which one interelectrode substrate 10 is used, and illustrates a method of inserting an interelectrode by making a channel in the middle of the back substrate 3. When the channel length is increased, similarly to FIG. 7, a plurality of inter grooves may be formed at a predetermined interval, and inter electrode portions may be formed in each of the grooves. The interelectrode portion has a structure in which the interelectrode 12, the dielectric layer 6, and the MgO protective layer 11 are sequentially stacked on both sides of the interelectrode substrate 10 as shown in an enlarged cross-sectional view of FIG. 7. Since there is a risk that the interelectrode substrate is destroyed by an electric field, it is preferable to apply a voltage having the same sign as possible to both interelectrodes formed at positions facing one interelectrode substrate.

8 shows a fourth embodiment of the surface light source device proposed in Korean Patent No. 2000-002699 filed by the inventor. In this embodiment, the channel is formed on the front substrate 1 in the same manner as the rear substrate 3 in order to increase the discharge space and the area of the phosphor layer 8 to realize the surface light source device having higher brightness and efficiency. It has its features.

The inventors of the present invention intend to propose various embodiments which are further improved to improve the light emitting efficiency or problems in the manufacturing process that occur in implementing the embodiments proposed in FIGS. 2 to 8. Hereinafter, described in detail by the accompanying drawings as follows.

9 is a perspective view of a surface light source device using an external electrode as one embodiment of the present invention. 9 (a) is a structure in which the channel shape formed on at least one surface of the upper surface or the lower surface is formed continuously to the end of the side, Figure 9 (b) is at least one surface of the upper surface or the lower surface The channel shape to be formed shows a structure having a channel shape cut off at the end of the side surface. 9 (a) and 9 (b) are bonded to each other and the outside of the left and right side surfaces of the surface light source device is covered with a metal side electrode as shown in FIGS. 9 (c) and 9 (d). The surface light source device can be configured. At this time, since the side electrode of the metal material takes the form of enclosing the glass container, there is no need for a separate dielectric layer, so there is an advantage that the glass container itself can be used as the dielectric. As shown in FIG. 9 (d), the metal side electrode may be formed only on the side surface, and as shown in FIG. 9 (a), a part of the side electrode as well as the side surface slightly covers a part of the front substrate 1 and the rear substrate 3. The structure is also possible. As a method of forming a metal side electrode as shown in Fig. 9 (c) or 9 (d), a conductive tape may be adhered using an adhesive, or a metal deposition method such as a sputtering method or a plating method may be used. 9 (a) and 9 (b), the front substrate 1 is shown as a thin flat glass substrate with no light emitting channel formed therein. In the case of using a glass substrate having a light emitting channel, the technical idea shown in FIG. 9 is applicable.

10 is a perspective view of a surface light source device having an integrated channel as another embodiment of the present invention. As shown in FIG. 10, a predetermined surface light source device can be easily produced by forming a plurality of rectangular channels in a thick substrate and attaching a substrate having electrodes formed thereon. In this case, the method of coating the phosphor inside the channel may be a method of allowing the phosphor made in a slurry state to flow down into the channel so that the phosphor is automatically attached to the wall of the channel.

11 is a perspective view of a surface light source device using an insert electrode as another embodiment of the present invention. As shown in FIG. 11A, after the electrode inlet grooves 13 are formed on both sides of the front substrate 1 and the rear substrate 2 on which the plurality of light emitting channels are formed, the side electrode substrate 4 and A back substrate 3 having a plurality of light emitting channels formed therein without inserting the interelectrode substrate 10 or the electrode inlet groove 13 is formed in the front substrate 1 as a flat plate as shown in FIG. After the electrode lead-in groove 13 is formed only in this case, the side electrode substrate 4 and the interelectrode substrate 10 may be inserted. FIG. 11 (c) shows a structure of a substrate on which an electrode inlet groove 13 is formed, and is applied to the front substrate 1, the rear substrate 3 of FIG. 11 (a), and the rear substrate 3 of FIG. 11 (b). One embodiment.

12 is a perspective view of a rear substrate having a protrusion formed as another embodiment of the present invention. When the channel is formed by the method shown in the surface light source device illustrated in FIG. 3, the uppermost portion of the channel formed on the rear substrate 3, which is in contact with the front substrate 1, does not act as a light emitting region. There is a problem that the uppermost part of the channel of the rear substrate 3 appears in a stripe pattern on the. In order to eliminate such a problem, as shown in FIG. 12, the protrusion 15 is provided on the floor 14 to form the channel 7, thereby minimizing a contact surface with the front substrate 1. That is, in order to more uniformly distribute the distribution of visible light extracted from the phosphor layer 8 of the rear substrate 3, a part of the upper end of the channel constituting the rear substrate 3 is removed and the protrusion 15 is provided. To do that. FIG. 13 shows a perspective view of a surface light source device for making luminance uniform as another embodiment to which the idea of FIG. 12 is applied. By forming the ridge 14 for forming the channel 7 slightly lower so as not to contact the front substrate 1, the luminance distribution can be formed more uniformly. FIG. 13 (a) shows a perspective view of the surface light source device, and FIG. 13 (b) shows a cross-sectional view of the temporary 'ga'. Referring to FIG. 13 (b), a part of the floor 14 for forming the channel 7 is formed so as not to contact the front substrate 1, the phosphor 8 is also coated on the floor 14, and the channel 7 is formed. The negative back substrate is provided with a reflective layer 9 for reflecting light diffused to the back side to the front side, and in some cases, the front substrate 1 is provided with a diffusion plate (not shown) for uniformly diffusing light. By this, light emission can be made more uniform.

14 is a detailed view for explaining the arrangement of the protrusions 15 formed on the floor 14. Fig. 14A shows the structure in which the protrusions 15 are formed in the form of a checkerboard in some areas of the floor, and the cross sections located at the bottom and the right side show cross-sectional shapes shown in the "A" direction and the "B" direction, respectively. will be. Fig. 14 (b) shows a structure in which the protrusions adjacent to some areas of the floor form the protrusions 15 in a lattice form, and the cross sections located at the bottom and the right side are shown in the "A" direction and the "B" direction. Lost cross-sectional shapes are shown respectively. Although the present invention has been described with respect to the arrangement of the two types of protrusions 15, the protrusions 15 formed on the back substrate 3 satisfy the idea of uniformly distributing the visible light expected in the present invention. The arrangement of the various protrusions 15 may also be included in the embodiment of the present invention as long as it supports 1).

Side electrodes or inter-electrodes used in the present invention may be applied in various forms to improve the luminous efficiency. 15 to 18 illustrate various electrode shapes that can be applied to the surface light source device of the present invention, in which the entire surface of the flat metal material of the flat plate and the metal material having various types of protrusions is coated with a dielectric layer composed of ceramics. The present invention relates to an electrode structure in which enamel technology is applied to a metallic material. FIG. 15 shows a flat metal plate side electrode 5 and a dielectric 6 formed therein, wherein a metal film bonded or coated on the glass substrate of Korean Patent No. 2000-002699 proposed by the present inventor is a side electrode substrate 4. ) And the interelectrode substrate 10 are different in that the present embodiment uses a metal plate. Hereinafter, FIGS. 16 to 18 illustrate embodiments of various types of electrode plate structures, which are more complicated and various than those of FIG. 15, which are simply flat metal plate ligaments. Fig. 16A is a perspective view showing the side electrode shape, and Fig. 16A-1 shows the metal plate side electrode 5 and the dielectric 6 shown in its cross-sectional structure, respectively. At this time, the dielectric 6 can be easily formed into a desired shape by forming it in the shape as shown in Fig. 16 (a-1) using a ceramic material and firing at high temperature. FIG. 16 (a-2) shows a method using a metal side electrode 5 having a metal plate protruding in a vertical plane as a metal plate electrode. 16 (b), 16 (b-1), and 16 (b-2) are perspective views and cross-sectional views showing the structure of the interelectrode. There is a shape on the side. If FIG. 16 forms an electrode in which a plurality of surfaces are formed in the horizontal direction, FIG. 17 illustrates a shape of a side electrode and an interelectrode in which a plurality of electrode surfaces are formed in a vertical direction, and FIG. 18 simultaneously forms horizontal and vertical surfaces. Thus, the shape of the side electrode and the interelectrode having a lattice-like protrusion is shown. In FIG. 18, only the lattice shape is illustrated, but other embodiments, such as a shape having a honeycomb protrusion and a hollow cylinder, may be included in the scope of the embodiment of FIG. 18.

Forming the electrode in the form as shown in Figs. 16 to 18 is to be applied to a hollow electrode of the so-called "U" shaped or cylindrical electrode structure. In addition to the above-described method, the electrode form formed of the hollow electrode is a sawtooth type, step type, tower type, and sine wave type as shown in FIGS. 19 (a), (b), (c) and (d), respectively. It can be implemented as an electrode having a form coated with a dielectric layer made of a ceramic material. Although the present embodiment has been described with respect to the shape as described above, it can be used in the surface light source device using a variety of forms that can be taken by processing other metal sheet material.

Each of the embodiments described in the present invention and Korean Patent Application No. 2001-002699 filed by the present inventors may be performed independently of each other, but in general, the embodiments are compatible with each other. For example, various types of electrodes illustrated in FIGS. 15 to 18 may be inserted into the embodiment as shown in FIG. 10 or the electrode retracting groove 13 of FIG. 11, and the Korean Patent No. 2001 filed by the present inventors. The various types of electrodes shown in FIGS. 15 to 18 may also be applied to the structure shown in -002699.

While the preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only, and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. Should be done.

According to the surface light source device of the present invention, first, in the performance, it is possible to realize a high brightness and high efficiency by increasing the area of the phosphor layer by the structure of making a plurality of grooves in the form of channels on the glass substrate and coating the phosphor on the inner surface thereof. Compared to conventional fluorescent lamps, the space taken up by the light source can be significantly reduced. In addition, since the conventional halogen lamp is a point light source and the fluorescent lamp is a linear light source, the present invention is a surface light source, so that sufficient illuminance can be obtained even if the luminance of the light emitting surface is lowered.

In addition, the surface light source device of the present invention has a small number of parts, a simple manufacturing process, and even a side electrode substrate and an interelectrode substrate having the most processes in the implementation of the present invention. . Specifically, according to the present invention, it is possible to simultaneously make and cut several side electrode substrates and a center electrode substrate on one large substrate.

In addition, by inserting the interelectrode substrate in the middle of the back substrate has the advantage that can easily implement a large surface light source device.

In addition, since various and complex types of hollow electrodes can be used as side electrodes and inter-electrodes, cheaper and more efficient surface light source devices can be realized.

Claims (28)

Transparent front substrate A back substrate having at least one floor for forming at least one rectangular channel with the front substrate, wherein a partial area of the floor is bonded and laminated with the front substrate; A phosphor coated on at least a portion of the front substrate and the rear substrate facing each other; Electrode portions for applying voltage to both side surfaces of the assembly of the front substrate and the rear substrate perpendicular to the longitudinal direction of the channel; A surface light source device having an inert gas introduced into the channel region. The method of claim 1, And a reflective layer reflecting light between the phosphor and the back substrate. The method of claim 1, And at least one of the front substrate and the back substrate is provided with a groove for forming the channel. The method of claim 3, wherein And the channel is formed in an inner region spaced apart from the electrode by a predetermined distance. The method of claim 1, The surface light source device, characterized in that the electrode portion is provided with a conductive thin electrode. The said electrode part in any one of Claims 1-4. A side electrode substrate formed of an insulator An electrode which is an electrical conductor formed on the front electrode substrate; A dielectric layer formed on the electrode; Stacked on the dielectric layer, the surface light source device, characterized in that formed as a protective layer for protecting the dielectric layer. The said electrode part in any one of Claims 1-4. A side electrode substrate formed of an insulator An electrode which is an electrical conductor formed on one surface of the side electrode substrate; And a protective layer formed on a surface different from the one surface of the side electrode substrate. The method according to claim 6 or 7, Surface protection device is characterized in that the protective layer is formed of magnesium oxide (MgO). Transparent front substrate A back substrate having a plurality of floors for forming at least one rectangular channel with the front substrate, the back substrate being bonded and laminated with the front substrate; A phosphor coated on at least a portion of the front substrate and the rear substrate facing each other; Electrode portions for applying voltage to both side surfaces of the assembly of the front substrate and the rear substrate perpendicular to the longitudinal direction of the channel; And an inert gas introduced into the channel region, and lowering the height of a part of the floor so that the whole of the floor does not come into contact with the rear substrate. The method of claim 9, And a reflective layer reflecting light between the phosphor and the back substrate. The method of claim 9, And a channel for forming the channel on at least one of the front substrate and the rear substrate. The method of claim 11, And the channel is formed in an inner region spaced apart from the electrode by a predetermined distance. The electrode unit according to any one of claims 9 to 12, wherein the electrode unit A side electrode substrate formed of an insulator An electrode which is an electrical conductor formed on the front electrode substrate; A dielectric layer formed on the electrode; Stacked on the dielectric layer, the surface light source device, characterized in that formed as a protective layer for protecting the dielectric layer. The electrode unit according to any one of claims 9 to 12, wherein the electrode unit A side electrode substrate formed of an insulator An electrode which is an electrical conductor formed on one surface of the side electrode substrate; And a protective layer formed on a surface different from the one surface of the side electrode substrate. The method according to claim 13 or 14, Surface protection device is characterized in that the protective layer is formed of magnesium oxide (MgO). A transparent substrate having a predetermined thickness having a plurality of rectangular channels therein; A phosphor applied to at least a portion of a surface forming the rectangular channel; An electrode part perpendicular to the longitudinal direction of the channel and configured to apply voltage to both sides of the substrate; A surface light source device having an inert gas introduced into the channel region. The method of claim 16, The surface light source device, characterized in that the reflection plate is provided on one side of the substrate. Transparent front substrate A back substrate having at least one floor for forming at least one rectangular channel with the front substrate and bonded and laminated with the front substrate; A phosphor coated on at least a portion of the front substrate and the rear substrate facing each other; A plurality of insertion grooves formed in at least one of the front substrate and the rear substrate; An insertion electrode inserted into the insertion groove and configured to apply a voltage to both sides of a junction of the front substrate and the rear substrate; A surface light source device having an inert gas introduced into the channel region. The method of claim 18, And a reflective layer reflecting light between the phosphor and the back substrate. The method of claim 18, And at least one of the front substrate and the back substrate is provided with a groove for forming the channel. The method of claim 20, And the channel is formed in an inner region spaced apart from the electrode by a predetermined distance. 22. The electrode unit according to any one of claims 18 to 21, wherein the electrode unit A side electrode substrate formed of an insulator An electrode which is an electrical conductor formed on the side electrode substrate; A dielectric layer formed on the electrode; Stacked on the dielectric layer, the surface light source device, characterized in that formed as a protective layer for protecting the dielectric layer. 22. The electrode unit according to any one of claims 18 to 21, wherein the electrode unit A side electrode substrate formed of an insulator An electrode which is an electrical conductor formed on one surface of the side electrode substrate; And a protective layer formed on a surface different from the one surface of the side electrode substrate. The method of claim 21 or 22, Surface protection device is characterized in that the protective layer is formed of magnesium oxide (MgO). 22. The electrode unit according to any one of claims 18 to 21, wherein the electrode unit The surface light source device, characterized in that formed of an electrode which is an electrical conductor and a dielectric layer surrounding the electrode. The method according to any one of claims 1, 9, 16 or 18, And the electrode portion has a structure in which a dielectric wraps the conductive plate-shaped electrode. The method of claim 26, The electrode unit includes at least one electrode protrusion protruding vertically on the conductive plate-like electrode. The method of claim 26, And the conductive plate-shaped electrode is provided in one of a sawtooth shape or a sine wave shape.