KR20000065759A - A flat lamp - Google Patents

Abstract

PURPOSE: A flat panel fluorescent lamp is provided to enhance brightness and assure uniform brightness on a plane without separate structures. CONSTITUTION: A flat panel fluorescent lamp comprises a front glass plate(1), a bottom plate(2), plural discharge passages(7), an optical diffusion plate(11), discharge electrode(3) and opposite electrode(3). The discharge passages(7) are formed in parallel on one of the plates(1,2). Parallel plural V-grooves and plural convex lenses are respectively formed on both sides of the optical diffusion plate(11), which is attached on the glass plate. The discharge electrode(3) is inserted into one side of the discharge passages(7). The opposite electrode(3) opposes the discharge electrode(3).

Description

Flat fluorescent lamp {A flat lamp}

The present invention relates to a flat fluorescent lamp. In particular, the present invention relates to a flat fluorescent lamp suitable for use as a backlight for a liquid crystal display (LCD).

LCDs, namely, LCDs, unlike light emitting diodes (LEDs), plasma display panels (PDPs), and electroluminescence (EL), do not emit light by themselves and require a separate light source (Back Light).

Conventional backlight for LCD has a cold cathode fluorescent lamp (Cold Cathode Fluorescent) in the form of a tube, bent in a straight, L-shaped, U-shaped, U-shape as a light emitting source as needed. In the direct type, the various types of cold cathode fluorescent tubes are mounted under the LCD cell and the luminance is uniformed by the reflecting plate and the diffuser plate under the LCD cell, but the thickness of the backlight is thick and the uniform luminance is not guaranteed. There is this. To solve this problem is an edge light method. However, the edge light method is also composed of a light guide plate, a light diffusion plate, a prism plate, etc. in order to send uniform light to the liquid crystal cell. By this structure, the light of the light source is transmitted by the light guide plate and uniformly diffuses the transmitted light through the light diffusion plate, and collects the light passed by the prism plate at the viewing angle of the liquid crystal plate and improves the brightness.

However, the conventional backlight has a low power consumption efficiency and a complicated structure due to reflection and transmission of light, and thus, it is difficult to ensure uniformity of luminance as well as high production cost. In general, laptop monitors use brightness of 70-100cd / m² or higher, but PC monitors require 200cd / m² and CRT displays 500-600cd / m². impossible. In addition, the complexity of the conventional backlight structure is an important obstacle for LCDs which are designed to make the display lightweight and thin.

The present invention is to provide a flat fluorescent lamp that does not need a separate structure in order to obtain a uniform brightness on the plane, not only high brightness but also essentially guarantees a uniform brightness on the plane.

1 is an exploded perspective view of the present invention

2 is a plan view of the bottom plate 2 of FIG.

3 is a cross-sectional view taken along line AA ′ of FIG. 2;

4 is a detailed view of the portion B of FIG.

FIG. 5A is a side view detail of a light diffusion plate; FIG.

Figure 5b is a side view of the b-shaped diffuser in detail

Figure 5c is a detailed view of the c-type side of the light diffusion plate

Figure 5d is a detailed view of the d-type side of the light diffusion plate

Figure 5e is a detailed view of the e-type side of the light diffusion plate

5f is a f-sided detailed view of the light diffusion plate

6 is a detailed view of the electrode support plate 4 of FIG.

7 is a cross-sectional view of one embodiment of the present invention.

8 is an assembled perspective view of an embodiment of the present invention.

** Description of Signs for Main Parts of Drawings **

1: front glass plate 2: bottom plate

3: discharge electrode 4: electrode support tube

5: phosphor 6: bulkhead

7: discharge passage 8: heat sink

9: heating heater 10: insulating protective film

11: light diffusion plate 12: encapsulant

13: exhaust hole 14: discharge hole

15: vacuum exhaust pipe 16: mercury getter

17: V-shaped light diffusing plane 18: Convex lens plane

According to the present invention,

Windshield;

A bottom glass plate ("bottom plate") corresponding to the front glass plate;

A plurality of discharge passages formed parallel to the lower surface of the front glass plate or the upper surface of the bottom plate;

A light diffusion plate attached to the front glass plate with a plurality of V-shaped grooves formed in parallel to one surface and a plurality of convex lens surfaces on the other surface;

A cathode electrode inserted into one side of the discharge passage; And

An opposite electrode inserted into the other side of the discharge passage so as to face the plurality of discharge passages;

The front glass plate and the bottom plate are vacuum-exhaust the discharge passage and the flat type fluorescent lamp which is sealed and bonded so as to fill the rare gas and is applied to the wall surface forming the discharge passage to emit light when the electrode plate is energized. Is provided.

The flat fluorescent lamp according to the present invention can be used in various places where a flat light emitting body is required, but is particularly suitable for being used for the backlight of the LCD.

For the cathode electrode used in the present invention, both cold cathode or hot cathode electrode tube can be used.

The discharge passage may be formed in a plurality of straight lines between the positive electrode plate, but in some cases it may be bent at least 180 degrees to cover the entire flat surface.

Many discharge passages are generally formed on the bottom plate, but may be formed on the bottom surface of the windshield. One of the methods of forming the discharge passage is to form a front glass plate or a bottom plate by printing a pattern as a resistor and to develop a portion without a resist by etching with a fluorine compound solution. The pattern is formed by screen printing or photolithography. Alternatively, the glass film may be formed by covering the flat plate with a partition structure having a discharge passage by screen printing. Each discharge passage may be completely isolated to prevent communication with each other, but by forming a predetermined pattern of gaps in the discharge passage, the discharge passages may be connected to each other to solve the discharge unevenness. Another method is to cover the front glass plate or the bottom plate with a barrier film having a discharge passage pattern and form the discharge passage by sand blasting.

The light diffusing plate has a light diffusing surface and a convex lens surface, each having a V-shaped groove line on both sides thereof, and is attached to the front glass plate so as to uniformly diffuse and condense within the viewing angle of the liquid crystal display, thereby increasing light utilization efficiency. After the discharge passage is sealed and vacuumed, the discharge rare gas (GAS) is filled in the discharge passage to emit light along the discharge passage when applying a high frequency between both electrodes, thereby providing uniform luminance by the light diffusion plate.

Hereinafter, the present invention will be described in detail with reference to the drawings.

Figure 1 shows an exploded perspective view of the present invention shows a flat fluorescent lamp having a typical discharge passage 7. The discharge electrode 3 is inserted in parallel to both ends of the discharge passage. The discharge electrode 3 may be selectively manufactured as a cold cathode electrode or a hot cathode electrode, and thus may be manufactured to cope with various performances. The windshield plate 1 and the bottom plate 2 are separated, and the front glass plate 1 and the bottom plate 2 are printed on the front glass plate 1 and the bottom plate 2 by printing a silicon glass encapsulant 12 by screen print or by using a dispenser. As shown, after coating the edges of the front glass plate 1 and the bottom plate 2, and after the drying process, the front glass plate 1 and the bottom plate 2 is bonded and sealed using a firing furnace.

After sealing sealing, the vacuum exhaust pipe 15 attached to the bottom plate 2 is heated, vacuumed, and exhausted. After the rare gas for discharge (GAS) is filled through the vacuum exhaust pipe 15, the vacuum exhaust pipe 15 is heat sealed.

Fig. 2 is a plan view of Fig. 1 (2), in which a plurality of discharge passages 7 and partitions 6 are provided, and phosphor 5 is coated on the interior of discharge passage 7 and side walls of partition 6, and discharge holes 14 and exhaust holes. 13 is installed.

3 is a cross-sectional view taken along line AA ′ of FIG. 2.

FIG. 4 is a detailed view of B of FIG. 3, in which phosphor 5 is applied to discharge passage 7 and partition 6.

5A through 5F are detailed side views of the a-f types of the light diffusion plate 11, and the convex lens surface 18 is processed on the upper surface of the light diffusion plate 11, and the light diffusion surface 17, which is a V-shaped groove line, is shown below. The light from the light source generated in the discharge passage 7 is uniformly dispersed throughout the lamp through the light diffusing surface, which is a V-shaped groove line processed under the light diffusing plate 11, so that the upper surface of the partition 6, which is the non-light emitting portion, and the discharge passage 7, which emits light. By uniformly adjusting the amount of light output from the upper surface of the to improve the luminous efficiency by uniformly diffused and aggregated throughout the liquid crystal display.

The convex lens surface 18 processed on the upper surface of the light diffusion plate 11 and the light diffusion surface 17, which is a V-shaped groove line processed on the lower surface, have an optical design with uniform shape and irregular shape to adjust the light output amount to optimize the performance. It can be manufactured to provide.

Fig. 6 is a perspective detail view of Fig. 1 (4), in which electrode 3 is inserted into electrode support tube 4, and a mercury getter 17 is attached to remove mercury gas and remove moisture and impurity gas, thereby contributing to the stabilization of light emission.

The electrode 3 may be selectively installed as a cold cathode electrode or a hot cathode electrode, and thus may be variously applied. 7 is a cross-sectional view of an embodiment of the present invention, the partition wall 6 is formed by attaching a masking tape to the top of the bottom plate 2 (Masking Tape) and forming a pattern using a cutting machine, the sandblasting machine for discharge Traditionally, it forms bulkhead 6 to secure seven. The patterned part remains as partition wall 6, and the partition wall 6 not only maintains the discharge passage but also prevents damage to the front and bottom plates 1 and 2 by atmospheric pressure when the front glass plate 1 and the bottom plate 2 are sealed and vacuum evacuated. It serves as a support to prevent.

The partition wall 6 for forming the discharge passage 7 is printed on the bottom plate 2 by a screen print method, or photo lithography, etching with fluorine compounds, and sand blast. It can be formed by a method. Formation of the phosphor 5 coated on the side walls of the discharge passage 7 and the partition 6 and the lower part of the windshield 1 is printed by the screen print method or by the spray method.

Phosphor 5 is evenly formed on the lower part of the front glass plate 1 and inside the discharge passage 7 and on the side wall of the partition wall 6, and after the drying process, the organic matter is removed using a firing furnace to discharge the lamp according to outgassing during discharge. It prevents reduction and shortening of life and maintains stable light emission.

8 is an assembled perspective view of an embodiment of the present invention, the heat sink 8 is attached to the bottom of the bottom plate 2 to dissipate heat generated during discharging, to prevent changes in the characteristics of the liquid crystal according to the temperature rise of the lamp and uniform thermal equilibrium throughout the lamp It is attached for the purpose of maintaining. The heat dissipation grease is applied between the heat sink 8 and the rear glass plate 2 to increase the thermal conductivity so that the heat dissipation of the entire surface of the lamp is uniform. Also, the white color is used to increase the reflectance to prevent the light emitted from the discharge passage 7 from being exposed to the outside. It is used to increase the light efficiency by increasing the reflection efficiency, and the heating heater 9 formed at the bottom of the heat sink 8 is formed to maintain a stable discharge at low temperature, and the heating heater 9 is a carbon paste screen print (Screen Print). ) Print by the method, or make a hot wire, insert it into the insulating protective film and attach it.

The insulating protective film 10 formed thereon prints an insulator by a screen printing method or attaches an insulating film for the purpose of protection and insulation of the heating heater 9.

Activation of the mercury getter 17 mounted inside the electrode support tube 4 installed at the upper and lower ends of the bottom plate 2 is activated in the entire discharge passage 7 by using a high-frequency heater. The accelerated electrons ionize the rare gas atoms and mercury atoms for discharge in the activated tube, and the discharge rare gas ions and mercury ions emit energy in the form of ultraviolet rays. The ultraviolet rays generated at this time excite the phosphor 5 coated on the interior of the discharge passage 7 and the six side walls of the partition wall and emit light as visible light.

The present invention eliminates the need for a tube-type cold cathode fluorescent lamp, a light guide plate, etc. used in a conventional backlight, and attaches a light diffusion surface, which is a convex lens surface and a V-shaped groove line, on the front glass plate at the top and the bottom thereof, respectively. The processed light diffusing surface uniformly disperses the light generated from the lamp to the liquid crystal display unit and condenses it within the viewing angle of the liquid crystal display unit through the processed convex lens surface on the upper surface to improve light utilization efficiency and light transmittance.

Due to these characteristics, uniform luminance distribution across the entire display surface of the lamp is realized, which reduces power consumption, reduces the thickness, and reduces the thickness, weight, and simplification, thereby making the most of the advantages of portability and thinness of the liquid crystal display device. It is a dramatic improvement in light transmittance reduction and luminance non-uniformity.

The flat fluorescent lamp of the present invention can be used for backlights and lighting lamps of LCDs, and can also be variously applied to many fields requiring flat light sources.

Claims (5)

Front glass plate 1; A bottom plate 2 corresponding to the front glass plate; A plurality of discharge passages 7 formed parallel to the bottom surface of the front glass plate or the top surface of the bottom plate; A light diffusion plate 11 attached to the front glass plate with a plurality of V-shaped grooves formed in parallel to one surface and a plurality of convex lens surfaces on the other surface; Discharge electrodes 3 inserted into one side of the plurality of discharge passages 7; And An opposite electrode 3 inserted into the other side of the discharge passage 7 so as to face the plurality of discharge passages; And the front glass plate 1 and the bottom plate 2 are vacuum-exhaust the discharge passage to seal and bond the discharge rare gas so as to be totally charged, and apply a fluorescent agent to a wall surface forming the discharge passage to emit light when the electrode plate is energized. Type fluorescent lamp. The flat fluorescent lamp of claim 1, wherein the discharge passages 7 are formed by etching the sand blast method or the fluorine compound or by stacking the barrier ribs by screen printing. . The flat fluorescent lamp of claim 1, wherein convex lens surfaces or V-shaped groove lines formed on the upper and lower surfaces of the front glass plate 1 are irregularly formed. The flat fluorescent lamp of claim 1, wherein the discharge passage 7 is bent several times to form the entire light emitting surface as one discharge passage. The flat fluorescent lamp according to claim 1, wherein the discharge electrode 3 is a cold cathode electrode or a hot cathode electrode.