KR100672416B1 - LCD Display - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (LCD). A surface light source implemented as an organic EL device having a top-imposition method is used as a component of a light guide plate, a polarizing plate, a prism sheet, etc. In addition, it is a technology for providing a backlight of the liquid crystal display device without a seal cover.

When the liquid crystal display device is configured in this way, there is an advantage of surface light emission, so that the difference in luminance is almost eliminated, the thickness is thin, the configuration is simple, and the manufacturing cost is low.

LCD, Backlight

Description

Liquid Crystal Display

1 is a cross-sectional view of a backlight for a general liquid crystal display device

2A and 2B illustrate a liquid crystal display device according to a first embodiment of the present invention.

3A to 3B illustrate a liquid crystal display according to a second embodiment of the present invention.

4 and 5 illustrate liquid crystal display devices according to third and fourth embodiments of the present invention.

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

300: liquid crystal display panel 400: backlight

500: adhesive layer

31 organic EL device of the top emission method

31a: substrate 31b: anode electrode

31c: organic EL layer 31d: cathode electrode

32: protective layer 33: sealing material

The present invention relates to a liquid crystal display device, and more particularly, to a backlight of a liquid crystal display device.

With the recent development of the information society, the necessity of flat panel displays having excellent characteristics such as thin film, light weight, and low power consumption has emerged. Among them, liquid crystal displays have a resolution and color display. It is excellent in image quality and is being actively applied to laptops and desktop monitors.

Currently, an active matrix liquid crystal display (AM-LED) in which a thin film transistor and pixel electrodes connected to the thin film transistor are arranged in a matrix manner is attracting the most attention due to its excellent resolution and ability to implement video.

The liquid crystal display device includes a color filter substrate (upper substrate) on which a common electrode is formed, an array substrate (lower substrate) on which a pixel electrode is formed, and a liquid crystal filled between the upper and lower substrates. The liquid crystal is driven by a vertical electric field in which the upper and lower pixel electrodes are up-down, and the alignment direction of the liquid crystal is changed by the vertical electric field, thereby adjusting the amount of light emitted from the light source to display an image.

Since the liquid crystal does not have the ability to emit light by itself, a separate light source must be configured.

In the liquid crystal display, since the light source is formed on the rear side of the liquid crystal panel, it is called a light distribution device (Backlight). The backlight is divided into a direct method and an edge method according to the display method. .

The direct method is a method of directly dimming the front surface of the substrate by placing a lamp configured in the backlight on the bottom of the liquid crystal display device, and the edge method is to place the lamp on one side or both sides of the substrate so that the light is reflected by a light guide plate and a reflecting plate to diffuse That's the way.

Of the two methods, the edge type backlight which can reduce the volume is mainly used.

Hereinafter, a liquid crystal display device according to the prior art will be described.

1 is a schematic cross-sectional view of an LCD including an edge type backlight.

As illustrated, the liquid crystal display device includes a liquid crystal display panel 100 and a backlight 200.

In the illustrated backlight 200, the lamp 14 is configured on one side of the light guide plate 16 in an edge manner, and all the light emitted from the lamp 14 is enclosed by the light guide plate 16 while surrounding the lamp 14. The lamp housing 12 is configured to face.

In this case, the light guide plate 16 serves to convert the linear light source into a surface light source to allow the light irradiated from the lamp 14 to be incident on the front surface of the liquid crystal panel (not shown). In the lower surface, a plurality of dots 18 are configured to diffuse light to make a uniform surface light source, which is formed by a general printing method.

The lower portion of the light guide plate 16 is further configured with a reflecting plate 20 for the purpose of preventing light leakage.

A diffusion plate 22, two prism sheets 24a and 24b, and a protective film 26 are sequentially disposed on the light guide plate 16 to secure a viewing angle.

Here, the prism sheets 24a and 24b have a plurality of triangular linear prisms on the top, and are arranged such that the linear prisms are perpendicular to each other.

As such, the conventional backlight is complicated because of its many components, and is not only thick, but also expensive.

In addition, the light guide plate must be used because the linear light source is used as a surface light source, and there is a big disadvantage in luminance variation.

The present invention has been made to solve the above problems, and its object is to provide a liquid crystal display device having a simple, thin and inexpensive backlight.

Another object of the present invention is to provide a liquid crystal display device having a backlight having almost no luminance difference.

According to an aspect of the present invention for achieving the above object, an anode electrode, an organic EL layer, and a cathode electrode are sequentially stacked on the liquid crystal display panel and the substrate to provide light to the liquid crystal display panel from the rear of the liquid crystal display panel. A liquid crystal display device comprising a top emission type backlight that illuminates, wherein the top and side surfaces of the organic EL layer and the cathode electrode stacked on the anode are sealed, and the backlight and the liquid crystal display panel It can provide a liquid crystal display device comprising an adhesive portion for adhering the back surface.
According to another aspect of the present invention, an anode, an organic EL layer, and a cathode are sequentially stacked on a liquid crystal display panel and a substrate to illuminate light on the liquid crystal display panel from the rear of the liquid crystal display panel. A liquid crystal display device comprising a backlight, wherein the organic EL layer and the cathode electrode are stacked on the anode electrode, and the organic EL layer and the cathode electrode are coated on an edge of the anode electrode. The liquid crystal display device may include an encapsulation material that adheres the anode electrode and the rear surface of the liquid crystal display panel.
Preferably, the liquid crystal display further comprises a protective layer covering the organic EL layer and the cathode electrode.
Preferably, the cathode is characterized in that the conductive material having a light transmittance as a material.

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Preferably, the cathode is characterized in that the material is a laminated film of Al or Mg-Ag having a thickness of 1 ~ 1000Å or less, ITO or inorganic material.

Preferably, the adhesive layer is characterized in that the material is any one of a UV-curing organic material, heat curing organic material or a mixed organic material thereof.

Preferably, the protective layer is any one of a film made of an organic material or an inorganic material or a laminated film made of an organic material and an inorganic material.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, the configuration and operation of the embodiments of the present invention with reference to the accompanying drawings, the configuration and operation of the invention shown in the drawings and described by it will be described as at least one embodiment, which By the technical spirit of the present invention described above and its core configuration and operation is not limited.

2A to 2B illustrate a liquid crystal display according to a first embodiment of the present invention.

As shown in FIG. 2B, the liquid crystal display according to the first exemplary embodiment of the present invention includes a liquid crystal display panel 300 and a tower for directly illuminating the liquid crystal display panel 300 from the rear of the liquid crystal display panel 300. An adhesive layer for bonding the backlight 400 formed of the organic EL element 31 of the emission method to the upper surface of the organic EL element 31 of the top emission system and the rear surface of the liquid crystal display panel 300. 500).

The adhesive layer 500 may be formed of a UV-curing adhesive, a heat curing adhesive, or a mixed organic adhesive thereof. In particular, it is preferable to use a UV-cure adhesive as a material.

Although not shown in the drawing, the liquid crystal display panel 300 includes a lower plate, an upper plate, a liquid crystal layer filled between the lower plate and the upper plate on which the TFT array is formed, and a rear surface of the lower plate to polarize light incident from the backlight 400. It consists of a polarizing plate.

The organic EL element 31 of the top emission method is composed of an anode electrode 31b, an organic EL layer 31c, and a cathode electrode 31d stacked on the substrate 31a.

It is preferable to use a glass substrate (glass substrate) that is commonly used as a substrate material as the substrate 31a, but in the case of the top-imposition method, since light is emitted to the opposite side of the substrate 31a, There is no need to limit the material.

The anode electrode 31b may be formed of a conductive material, but may be made of ITO, an organic conductive material, a metal, an alloy of a metal, a metal laminate, or a mixture thereof. In particular, it is good to use a thin coating of chromium (Cr) on the thickness of any one of Al, AlNd, Ag in 1 ~ 1000Å thickness. That is, it is preferable to use any one of an Al / Cr laminated film, an AlNd / Cr laminated film, and an Ag / Cr laminated film.

The organic EL layer 31c may be implemented in various colors according to the purpose of the device. However, in order to implement a color liquid crystal display device, the organic EL layer 31c may be made of a material capable of emitting white light, and the cathode electrode 31d may be formed. The light-transmitting conductive material is composed of a material. For example, ITO, an organic conductive material, a metal, an alloy of a metal, a metal laminated film, or a mixture thereof is used as the material. In particular, it is good to use Al and Mg-Ag thinly coated with a thickness of 1 to 1000 mm 3 and coated with ITO or an inorganic material thereon.

The manufacturing process of the liquid crystal display according to the first embodiment of the present invention is as follows.

First, as shown in FIG. 2A, the anode electrode 31b, the organic EL layer 31c, and the cathode electrode 31d are sequentially stacked on the substrate 31a to form the organic EL element 31. FIG.

In addition, as shown in FIG. 2B, the organic EL device 31 of the top-imposition method is formed on the rear surface of the liquid crystal display panel 300 using the adhesive layer 500 in a vacuum or an atmosphere in which moisture and oxygen can be adjusted. By bonding, the organic EL device according to the first embodiment of the present invention is completed.

3A to 3B show a liquid crystal display device according to a second embodiment of the present invention, further comprising a protective layer 32 covering the organic EL element 31 than in the first embodiment.

As the protective layer 32, any one of a film made of an organic material or an inorganic material and a laminated film formed by using an organic material and an organic material is used.

First, as shown in FIG. 3A, the anode electrode 31b, the organic EL layer 31c, and the cathode electrode 31d are sequentially stacked on the substrate 31a, and the organic EL of the top emission method is sequentially stacked. After the element 31 is formed, the protective layer 32 is formed so that the organic EL element 31 is wrapped.

3B, the organic EL element 31 is adhered to the rear surface of the liquid crystal display panel 300 using the adhesive layer 500 in an atmosphere in which vacuum or moisture and oxygen amount can be adjusted. The organic EL device according to the second embodiment is completed.

4 and 5 show a liquid crystal display device according to the third and fourth embodiments of the present invention, which do not use an adhesive layer as compared with the first and second embodiments, and emit light of the organic EL element 31. The encapsulant 33 is coated on the periphery of the liquid crystal display panel 300 and the anode electrode 31b of the organic EL element 31 to seal the light emitting portion of the organic EL element 31. I use it.

That is, the liquid crystal display according to the third exemplary embodiment of the present invention is a liquid crystal display panel 300 and a top-mission system that illuminates the liquid crystal display panel 300 in a direct manner from the rear of the liquid crystal display panel 300. The backlight 400 formed of the organic EL element 31 and the light emitting portion of the organic EL element 31 are applied to the periphery thereof, and the anode electrode 31b of the liquid crystal display panel 300 and the organic EL element 31 is applied. ) Is composed of an encapsulant (33) for bonding together.

On the other hand, the liquid crystal display device according to the fourth embodiment of the present invention is a liquid crystal display panel 300 and the top-mission method of illuminating the liquid crystal display panel 300 in a direct manner from the rear of the liquid crystal display panel 300 The organic EL element 31, the protective layer 32 covering the organic EL element 31, and a light emitting portion of the organic EL element 31 are applied to the periphery of the organic EL element 31, and the organic EL element 31 is disposed on the organic EL element 31. It consists of the sealing material 33 which bonds between the anode electrodes 31b of the EL element 31. As shown in FIG.

In the method of manufacturing the liquid crystal display device according to the third and fourth embodiments, in the method of manufacturing the liquid crystal display device according to the first and second embodiments, a substrate on which an organic EL element is formed using an adhesive layer is directly placed on the back of the liquid crystal display panel. Instead of gluing, only the edges are bonded using the encapsulant, and other details are the same, and thus will not be repeated.

The backlight of the liquid crystal display according to the present invention as described above has the following effects.

By using the backlight of the liquid crystal display device, the surface light source implemented by the organic EL device of the top-imposition method can provide the backlight without using a seal cover as well as components such as a light guide plate, a polarizing plate, and a prism sheet. Therefore, there is an advantage in surface light emission, so that there is almost no difference in luminance, and the manufacturing of the liquid crystal display device is simple, inexpensive, and thin.

Further, by adhering the liquid crystal display panel and the organic EL element with an adhesive which is advantageous for outcoupling, it becomes possible to manufacture a liquid crystal display device having good efficiency and lifespan.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (8)

A liquid crystal display panel; And A liquid crystal display device comprising a top emission type backlight for sequentially stacking an anode electrode, an organic EL layer, and a cathode electrode on a substrate to illuminate the liquid crystal display panel from the rear of the liquid crystal display panel. And an adhesive part for sealing the top and side surfaces of the organic EL layer and the cathode electrode stacked in the center of the anode electrode, and adhering the backlight and the rear surface of the liquid crystal display panel. delete A liquid crystal display panel; And a top emission type backlight configured to sequentially stack an anode electrode, an organic EL layer, and a cathode electrode on a substrate to illuminate light on the liquid crystal display panel from the rear of the liquid crystal display panel. The organic EL layer and the cathode electrode stacked in the center of the anode electrode are sealed, and the anode electrode and the liquid crystal display are coated on the edges surrounding the organic EL layer and the cathode electrode on the anode electrode. Liquid crystal display device comprising a sealing material for bonding the back of the panel. The liquid crystal display device according to claim 1 or 3, further comprising a protective layer covering the organic EL layer and the cathode electrode. The method of claim 1 or 3, wherein the cathode electrode A liquid crystal display device comprising a light-transmitting conductive material as a material. The method of claim 5, The cathode electrode is a liquid crystal display device comprising Al or Mg-Ag having a thickness of 1 to 1000 GPa or less, and a laminated film of ITO or an inorganic material. The method of claim 1, wherein the adhesive layer A liquid crystal display device comprising any one of a UV-curing organic material, a heat curing organic material, or a mixed organic material thereof. The method of claim 4, wherein the protective layer A liquid crystal display device comprising: a film made of an organic material or an inorganic material, or a laminated film formed of an organic material and an inorganic material.

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