KR100838332B1 - Back light unit for flat-panel display - Google Patents

Abstract

A backlight structure for a flat panel display is provided to transmit light smoothly by using plural lamps installed in one side of plural lower light guide plates, thereby enabling a manufacturer to manufacture the flat panel display with a desired size more than 100 inch. In a light guide plate(100), an upper light guide plate(120) and plural lower light guide plates(110) are installed with constant intervals. A lamp(200) is installed in a substrate(210) so as to radiate light to one side or both sides of the plural lower light guide plates. The substrate where the lamp is installed is installed in a case(300). The case is coupled with one side or both sides of the lower light guide plates. In the bottom of the light guide plate and the case, a reflection sheet(400) for reflecting light is installed. The light guide plate, the lamp, the case and the reflection sheets are installed within a mold frame(500). The upper light guide plate has a scratch on it.

Description

Back light unit for flat-panel display

1 is a block diagram showing a conventional flat panel display.

2 is a cross-sectional view showing a backlight structure for a flat panel display according to the present invention.

3 is an enlarged cross-sectional view of the main portion of FIG. 2.

4 is a configuration diagram illustrating another embodiment of FIG. 2.

5 is a configuration diagram illustrating another embodiment of FIG. 3.

6 is a configuration diagram illustrating an angle at which light of a lamp installed at one side of the lower light guide plate of FIG. 5 is irradiated.

7 is a cross-sectional view showing the configuration of another embodiment of FIG.

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

100: light guide plate 110: lower light guide plate

120: upper light guide plate 130: scratch

200: lamp 210: substrate

300: case 310: substrate

400: reflective sheet 500: mold frame

600: bolt 610: adhesive

700: nut

The present invention relates to a backlight structure for a flat panel display. More particularly, the size of the flat panel is not limited by arranging a plurality of lamps at equal intervals and allowing light to be transferred to the upper light guide plate through the lower light guide plate between the plurality of lamps. The present invention relates to a backlight structure for a flat panel display that allows a manufacturer to increase the size to a desired size.

In general, the liquid crystal display device is one of the flat panel display devices most widely used at present, and is one of the flat panel display devices on which the field generating electrodes are formed, and the two display panels on which the field generating electrodes are formed and the liquid crystal interposed therebetween. The display device is made of a layer to adjust the transmittance of light passing through the liquid crystal layer by rearranging the liquid crystal molecules of the liquid crystal layer by applying a voltage to the electrode.

Such a liquid crystal display includes a backlight unit that generates light and a liquid crystal panel that displays an image using light generated by the backlight unit.

The liquid crystal panel of the liquid crystal display displays image information by blocking or passing light generated from the backlight unit without emitting light. Therefore, the liquid crystal display device requires a light source, and the backlight unit positioned behind the liquid crystal panel is used as the surface light.

The backlight unit is composed of a lamp, a reflecting plate, a light guide plate, and an optical film, and the optical film is composed of a reflecting film, a diffusion film, and a prism film.

Liquid crystal display devices are used in various ways for displays, such as notebooks, monitors, TVs, mobile phones, etc., depending on the intended use.

1 shows a configuration of a flat panel display. As shown in the figure, the light guide plate 10 is formed narrower gradually from one side to the other side, the lamp 20 is provided only on one side of the light guide plate 10, the light emitted from the lamp 20 10) The lamp reflector 30 is installed to be collected to one side, the lamp reflector 30 is formed long from the one side of the lamp 20 to the bottom of the light guide plate 10.

A reflective sheet 40 is formed at the bottom of the lamp reflector 30, and the reflective sheet 40 reflects light emitted to the light guide plate 10 toward the opposite side of the screen.

A diffuser sheet 60 is uniformly stacked on the upper part of the light guide plate 10 to uniformize the light emitted from the light guide plate 10 and at the same time process the entire light smoothly.

A prism 70 is installed on the diffusion sheet 60, and the prism 70 includes a vertical prism 71 and a horizontal prism 72.

The prism 70 serves to enhance the brightness by refracting and condensing the light whose brightness is lowered by the diffusion sheet 60, and has a fine pitch of the mountain shape, the bottom is vertical and the top is horizontal. Usually, it is composed of two pieces.

A protective sheet 80 is installed on the upper portion of the prism 70, and the protective sheet 80 is used to protect the prism 70 because it is very sensitive to impacts, stains, foreign matters, and the like. 71, 72) also eliminates the interference phenomenon.

Recently, as the performance of the prism 70 is improved, products that do not use the protective sheet 80 are also produced.

In the case of the flat panel display configured as described above, the shape of the light guide plate 10 installed in the backlight unit has the shape of a right triangle so that the light reaches when the light of the lamp 20 is irradiated to one side of the light guide plate 10. Since the size is limited, there is a problem in that the size of the light guide plate 10 does not increase indefinitely.

That is, since the distance the light reaches when the light is incident on the light guide plate 10 is limited, the shape of the light guide plate 10 is to take the shape of a right triangle to maximize the light arrival.

However, as the distance that light reaches is limited, it is difficult to produce the size of the flat panel display to a desired size, so there is a problem that the current maximum size is not more than 100.

Currently, demand for flat panel displays is increasing, and as the size of the display is increasing, there is a problem that it is difficult to produce the desired size.

The present invention for solving the above problems is not limited to the size of the flat panel display, it is an object to provide a backlight structure for a flat panel display to be able to produce a flat panel display in a desired size.

In addition, an object of the present invention is to provide a backlight structure for a flat panel display in which a surface light source is enlarged by installing a plurality of lamps and light guide plates so that the light source is not degraded even when the size is increased.

The present invention for achieving the above object is a light guide plate is configured, the lamp is installed on one side of the light guide plate, the lamp and the reflective sheet for reflecting light at the bottom of the light guide plate is installed, the light guide plate, the lamp, the reflective sheet is fixed to the frame In the backlight unit consisting of a light guide plate, the upper light guide plate and the plurality of lower light guide plates are installed at regular intervals, the lamp is installed on the substrate to irradiate light to one or both sides of the plurality of lower light guide plates, the substrate is installed lamp Silver is installed in the case provides a backlight structure for a flat panel display, characterized in that coupled to one side or both sides of the lower light guide plate.

In addition, in the backlight unit, a light guide plate including a lower light guide plate and an upper light guide plate is configured, and a lamp installed on a substrate is installed on one side of the lower light guide plate, and the substrate and the lamp are installed inside the case so that light can be irradiated with the light guide plate. The light guide plate and the bottom of the case is provided with a reflection sheet for reflecting light, the light guide plate, a lamp, a case and a reflection sheet installed on the substrate is installed inside the mold frame, the light guide plate, the reflection sheet is a bolt and nut in the mold frame It is fixed by or to provide a backlight structure for a flat panel display, characterized in that for fixing the lower light guide plate and the upper light guide plate using any one of the transparent adhesive.

In addition, in the backlight unit, a plurality of light guide plates are stacked in a step shape, and lamps are provided on both sides of the stacked light guide plates, respectively, to provide a backlight structure for a flat panel display.

Hereinafter, a backlight structure for a flat panel display according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a cross-sectional view illustrating a backlight structure for a flat panel display according to the present invention, FIG. 3 is an enlarged cross-sectional view illustrating main parts of FIG. 2, FIG. 4 is a block diagram showing another embodiment of FIG. 2, and FIG. 3 is a configuration diagram illustrating another embodiment, and FIG. 6 is a configuration diagram illustrating an angle at which light of a lamp installed at one side of the lower light guide plate of FIG. 5 is irradiated.

As illustrated in FIGS. 2 to 6, the light guide plate 100 is configured to uniformly diffuse light on the entire screen, and the light guide plate 100 includes a lower light guide plate 110 and an upper light guide plate 120.

The lower light guide plate 110 is provided in plurality at regular intervals, and the upper light guide plate 120 is installed on the upper portion of the lower light guide plate 110.

Each side of the lower light guide plate 110 is configured with a lamp 200, the lamp 200 emits light to be incident to the lower light guide plate 110 and the upper light guide plate 20.

In addition, the scratch 130 is formed to collect light only in any one of the upper light guide plate 120 and the lower light guide plate 110, which may be formed by changing the position according to the manufacturer's circumstances.

The lamp 200 installed on the substrate 210 uses a Cold Cathode Fluoresence Lamp (CCFL) or Luminscent Diode (LED). The biggest feature is a low power consumption, high brightness, and low heat dissipation. It is an advantage.

The substrate 210 has a circuit (not shown) configured to apply power required by the lamp 200.

The substrate 210 has a thickness of 1.6 mm or 2 mm, and the material is made of polycarbonate or acrylic to epoxy so that the shadow does not appear due to the light of the lamp 200. Mix to form transparent.

The substrate 210 in which the lamp 200 is installed is installed in a transparent case 300, and the case 200 in which the lamp 200 and the substrate 210 are installed is installed at one side of the lower light guide plate 110. When the 200 emits light, the light is incident on the light guide plate 100.

The case 300 has a cross-section having a 'c' or '工' shape to form a coupling groove 310 to which the substrate 210 is coupled.

In addition, since the case 300 is formed to be transparent, the shadow does not occur even when positioned between the lower LGP 110 and the lower LGP 110. Since it is incident to), there is no shadow part.

The case 300 having the lamp 200 and the substrate 210 installed thereon is installed at one side or both sides of the plurality of lower LGPs 110, and the upper LGP 120 is disposed on the upper portion of the case 300 and the lower LGP 110. This is installed.

In addition, a plurality of lower LGPs 110, a lamp 200 installed on one side or both sides, and a bottom of the case 300 on which the substrate is installed are provided with a reflective sheet 400, and the reflective sheet 400 is opposite to the screen. Reflects the emitted light in the direction of the screen to increase the efficiency of the light.

The mold frame 500 is installed at the bottom of the case 300 and the bottom of the lower light guide plate 110 in a state where the reflective sheet 400 is installed.

A lower light guide plate 110, an upper light guide plate 120, a case 300 and a reflective sheet 400 on which the lamp 200 and the substrate 210 are installed are installed inside the mold frame 500.

The lower LGP 110, the upper LGP 120, and the reflective sheet 400 are fixed to the mold frame 500 using the bolt 600 and the nut 700 in a state where the lower LGP 110, the upper LGP 120, and the reflective sheet 400 are installed in the mold frame 500.

Coupling the lower light guide plate 110 and the upper light guide plate 120 is not to be fixed only by the bolt 600 and the nut 700, and the adhesive 610 is disposed between the lower light guide plate 110 and the upper light guide plate 120. It may be applied to and adhered to.

As described above, the bolt 600 for fixing the lower LGP 110, the upper LGP 120, and the reflective sheet 400 to the mold frame 500 may be transmitted to the light of the lamp 200 installed in the case 300. The material is made transparent using polycarbonate material.

The diffusion sheet, the vertical and horizontal prisms, and the protective sheet described in FIG. 1 are sequentially stacked on the backlight unit 1 configured as described above.

7 is a cross-sectional view showing the configuration of another embodiment according to the present invention. As shown in FIG. 7, a plurality of light guide plates 100 are stacked in a stepped manner, and lamps 200 are installed at both sides of the light guide plate 100 stacked in a stepped manner so that light is incident on the light guide plate 100. .

In addition, the reflective sheet 400 is disposed at the bottom of the plurality of light guide plates 100 in the same shape as the light guide plate 100 is stacked to increase the reflection efficiency of light.

According to the present invention configured as described above, when power is applied to the lamp 200 through a circuit formed on the substrate 210, the lamp 20 to which power is applied emits light.

When the light of the lamp 200 is incident through one side or both sides of the lower LGP 110, the lower LGP 110 diffuses the light toward the upper LGP 120 and the reflective sheet 400.

At this time, the light is transmitted to the opposite direction of the screen by the reflective sheet 400 to prevent the loss of light as much as possible.

The light irradiated by the lamp 200 also reflects the reflective sheet 400 to be incident to the lower light guide plate 110.

In this case, the light of the lamp 200 is not incident only through one side or both sides of the lower LGP 200, and the light reflected by the reflective sheet is incident toward the upper LGP 110.

That is, the light of the lamp 200 is incident to the lower light guide plate 110 and the upper light guide plate 120, and transmits the light dispersed in the lower light guide plate 110 back toward the upper light guide plate 120 to reduce the loss of light. In addition, light of a predetermined lux or more is transmitted by the lamps 200 installed at one side or both sides of the plurality of lower light guide plates 110.

The light transmitted through the lower light guide plate 110 and the reflective sheet 400 is incident to the upper light guide plate 120 again. At this time, light is collected on the scratch 130 formed on the upper light guide plate 120, and the scratch 130 is applied to the scratch 130. Collected light is uniformly distributed to maintain a constant brightness.

In addition, when light emitted from the lamp 200 is incident to the lower light guide plate 110, shadows are not generated by the cases 300 installed between the lower light guide plates 110. It is formed through a transparent material, and since the light of other lamps 200 adjacent to it shines together, no shading occurs.

In addition, since the substrate 210 installed inside the case 300 is also transparently formed by mixing polycarbonate or acrylic with epoxy, light of the lamp 200 is transmitted, thereby preventing shading.

Light collected on the scratch 130 of the upper light guide plate 120 is applied to a diffusion sheet, a vertical and horizontal prism, and a protective sheet sequentially stacked on the upper light guide plate 110 to display an image.

As illustrated in FIG. 7, since the light guide plates 100 are stacked in a stepped manner, and lamps 200 for irradiating light are installed on both sides of the stacked light guide plates 100, the light does not reach even when the screen size increases. Since there is no part, it can provide clear picture quality.

In addition, the light guide plate 100 configured to collect light has a step shape, and each light guide plate 100 has a scratch 130 formed therein, so that light is collected and maintains a constant brightness, thereby achieving clear image quality.

As described above, even if the manufacturer of the flat panel display manufactures the size of 100 inches or more, since the lamps 200 are installed at one side or both sides of the plurality of lower light guide plates 110, the light reaches It solves the problem of not doing so that the producer can produce the desired size without limiting the size.

According to the present invention, when the size of the flat panel display is manufactured to a desired size, the light is smoothly transmitted by a plurality of lamps installed on one side of the plurality of lower light guide plates, thereby allowing the manufacturer to produce a flat panel display having a desired size of 100 inches or more. It works.

In addition, by installing a plurality of lamps and light guide plates to enlarge the surface light source, even if the size is increased, there is an effect that can display a clear picture quality without deteriorating the light source.

In addition, even if light is emitted from the lamp installed on the substrate to illuminate the substrate or the case, since the substrate and the case are formed of a transparent material, there is an effect that shading does not occur.

In addition, since the light is evenly gathered on the scratch of the upper light guide plate, there is an effect that can implement a clear image quality.

In addition, when fabricating a light having a size of 100 or more, when the light of the lamp is incident on the light guide plate, light does not reach the end, that is, the other side where the lamp is installed.

Claims (6)

In a backlight unit comprising a light guide plate, a lamp is provided on one side of the light guide plate, a lamp and a reflective sheet for reflecting light at the bottom of the light guide plate, and a light guide plate, a lamp, and a frame on which the reflective sheet is fixed. The light guide plate 100 is provided with an upper light guide plate 120 and a plurality of lower light guide plates 110 at regular intervals, The lamp 200 is installed on the substrate 210 to irradiate light to one side or both sides of the plurality of lower light guide plates 110. The substrate 210 in which the lamp 200 is installed is installed in the case 300, and the case 300 is coupled to one side or both sides of the lower light guide plate 110. The method of claim 1, Scratches 130 are formed on the upper light guide plate 120, the backlight structure for a flat panel display. The method of claim 1, Back light structure for a flat panel display, characterized in that the substrate 210 and the case 300 is formed transparent. In the back-up unit, The light guide plate 120 including the lower light guide plate 110 and the upper light guide plate 120 is configured, Lamp 200 installed on the substrate 210 is installed on one side of the lower light guide plate 110, The substrate 210 and the lamp 200 are installed inside the case 300 to irradiate light to the light guide plate 100. At the bottom of the light guide plate 100 and the case 300, a reflection sheet 400 for reflecting light is installed. The light guide plate 100, the lamp 200, the case 300, and the reflective sheet 400 installed on the substrate 210 are installed inside the mold frame 500. The light guide plate 100 and the reflective sheet 400 are fixed to the mold frame 500 by bolts 600 and nuts 700, or the lower light guide plate 110 and the upper light guide plate 120 may be transparent adhesives 610. Back light structure for a flat panel display, characterized in that fixed using one. The method of claim 4, wherein The substrate 210, the case 300, the bolt 600 is a backlight structure for a flat panel display, characterized in that formed transparent. In the backlight unit, A plurality of light guide plates 100 are stacked in a staircase shape, and a lamp 200 is installed at both sides of the stacked light guide plates 100 to respectively irradiate light.

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