KR20070117899A - Flat Panel Display - Google Patents

Abstract

A flat panel display device is provided to efficiently prevent moisture and light from permeating a driving IC(Integrated Circuit) by forming a protection layer on the driving IC mounted on a display panel. A flat panel display device comprises at least one or more display panels, a driving IC(2) and a protection layer(3). The driving IC is installed on the display panel through a COG(Chip On Glass) in order to drive the display panel. The protection layer blocks external light, irradiated to the driving IC, and moisture. A light transmittance of the protection layer is less than 0.05%. The projection layer is black.

Description

Flat panel display device

1 is a plan view of a flat panel display panel according to an exemplary embodiment of the present invention.

2 is an exploded perspective view of a flat panel display device according to an embodiment of the present invention;

3 is a cross-sectional view taken along the line II ′ of the flat panel display panel used in the embodiment of FIG. 2.

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

4: first display panel

4a, 4b: substrate 6, 34: integrated circuit

8: protective layer 10,20: optical sheet

12 light emitting diode 14 light emitting diode substrate

16: mold frame 18: light guide plate

20: Reflector 22, 22 ': Bezel

24, 26, 32: printed circuit board 28: connector

30: second display panel 36, 38: pad portion

50: backlight assembly 60: flat panel display

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display, and more particularly, to a flat panel display that protects a driving integrated circuit provided on a display panel from external light without a separate light shielding tape.

Flat panel display devices have been attracting attention as an alternative means of overcoming the disadvantages of the existing cathode ray tube due to the advantages of miniaturization, light weight, and low power, and are currently used not only for portable devices such as mobile phones and PDAs The monitor and TV, which is a medium-large product, are also mounted, and in particular, the display unit of most portable devices such as a mobile phone or a PDA has almost all flat panel display devices employed.

Flat panel display devices include liquid crystal displays, field emission displays, plasma display panels, and organic light emitting displays. In order to achieve this, a driving integrated circuit is mounted. In recent years, the driving integrated circuit has been following a COG (chip on glass) method directly mounted on a substrate.

In this case, the driving integrated circuit mounted directly on the substrate has a problem of being exposed to the intrusion of moisture and external light, and a protective film is coated on the driving integrated circuit, and a light shielding tape is provided on the protective film.

In particular, in the conventional flat panel display device, the tape provided for combining various components and blocking UV rays not only increases the manufacturing cost but also hinders the slimming of the flat panel display device, thereby weakening the rigidity of the flat panel display device. There is a problem that causes frequent failures and breakage.

Accordingly, there is a need to find a structural plan to improve the rigidity while removing the plurality of tapes provided in the flat panel display device, thereby realizing the slimming of the flat panel display device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flat panel display device which efficiently prevents penetration of UV light and moisture while removing the UV light blocking tape on the driving integrated circuit mounted on the display panel.

One aspect of the present invention is a flat panel display panel in which a driving integrated circuit is mounted in a chip on glass (COG) method, and includes a protective layer on the driving integrated circuit to block external light and moisture. It is done.

According to another aspect of the present invention, a flat panel display may include at least one display panel; A driving integrated circuit provided on the display panel in a chip on glass (COG) manner to drive the display panel; And a protective layer that blocks external light and moisture irradiated to the driving integrated circuit.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 is a plan view of a flat panel display panel including a driving integrated circuit according to an exemplary embodiment of the present invention. Accordingly, an integrated circuit for driving the light emitting device is mounted on one side on the substrate 1 on which the light emitting device is formed in a chip on glass (COG) method, and the integrated circuit 2 supplies a data signal and a scan signal.

When the integrated circuit 2 is formed by the COG method, the integrated circuit 2 is easily exposed to external light and moisture. In order to block this, the conventional display device has a moisture-proof function on the integrated circuit 2. Although the sealant and the light shielding tape are separately formed, this not only increases the manufacturing cost but also hinders the slimming of the flat panel display.

In this embodiment, the light blocking tape is removed on the integrated circuit 2, and a light blocking protective layer 3 capable of simultaneously performing the functions of the sealant and the light blocking tape is applied.

At this time, the light shielding sealant is preferably an inorganic material having a strong moisture-proof function, for example, can be cured by applying liquid silicone. In particular, when the sealant is implemented in black, the light blocking effect can be enhanced.

The protective layer 3 is applied while surrounding the top and the periphery of the integrated circuit 2. At this time, it is preferable that the light transmittance of the protective layer 3 is 0.05% or less. If the amount exceeds 0.05%, ultraviolet rays penetrate the protective layer and affect the integrated circuit, causing the integrated circuit to malfunction. The light transmittance can be adjusted by changing the material content of the protective layer 3 to be described later.

The protective layer 3 may be formed by mixing carbon black with a silicone adhesive. At this time, the carbon black has a diameter of about 35 nm and a content of 1.5 wt% to satisfy the above-described light transmittance.

2 is an exploded perspective view illustrating a flat panel display device using the flat panel display panel according to an exemplary embodiment of the present invention. In the present exemplary embodiment, the flat panel display device is described as an example of a dual type display device in which the display panel is provided on both sides, but this is not to mention that the display panel is provided only on one surface.

Accordingly, the flat panel display 60 according to the embodiment of the present invention includes a first display panel 4, a backlight assembly 50, a bezel 22, a first printed circuit board 24, and a first display panel 60. 2, the printed circuit board 26 and the second display panel 30 are included.

Here, the first display panel 4 displays a predetermined image. In the exemplary embodiment of the present invention, the first display panel is configured of a liquid crystal display panel.

The first display panel 4 includes a first substrate 4a, a second substrate 4b, and a liquid crystal (not shown) injected therebetween, and the second substrate 4b has a matrix form. And a plurality of thin film transistors (hereinafter referred to as "TFTs").

However, the source electrode of the TFT is connected to the data line, the gate electrode is connected to the scan line, and the drain electrode of the TFT is connected to the pixel electrode made of transparent indium tin oxide (ITO). Such a TFT is turned on when the scan signal is supplied to the scan line to supply the data signal supplied from the data line to the pixel electrode.

To this end, an integrated circuit 6 is mounted on one side of the second substrate 4b in a chip on glass (COG) manner, and a data signal and a scan signal are supplied from the integrated circuit 6.

Since the integrated circuit 6 may malfunction when external light, that is, UV light is introduced, in the conventional display device, a sealant having a moisture-proof function and a light blocking tape are separately formed on the integrated circuit 6. This not only increases the manufacturing cost as mentioned above, but also hinders the slimming of the flat panel display.

Accordingly, the present invention removes the light-blocking tape on the integrated circuit 6 and applies a light-blocking protective layer 8 capable of simultaneously performing the functions of the sealant and the light-blocking tape.

At this time, the light shielding sealant is preferably an inorganic material having a strong moisture-proof function, for example, can be cured by applying liquid silicone. In particular, when the sealant is implemented in black, the light blocking effect can be enhanced.

FIG. 3 is a cross-sectional view taken along line II ′ of the display panel in the embodiment of FIG. 2, whereby a protective layer 8 is applied surrounding the top and surroundings of the integrated circuit 6. At this time, it is preferable that the light transmittance of the protective layer 8 is 0.05% or less. If the amount exceeds 0.05%, ultraviolet rays penetrate the protective layer and affect the integrated circuit, causing the integrated circuit to malfunction. The light transmittance can be adjusted by changing the material content of the protective layer 8 to be described later.

The protective layer 8 may be formed by mixing carbon black with a silicone adhesive. At this time, the carbon black has a diameter of about 35 nm and a content of 1.5 wt% to satisfy the above-described light transmittance.

In addition, the first substrate 4a of the first display panel 4 is disposed to face the second substrate 4b. A common electrode made of ITO is coated on the entire surface of the first substrate 4a. A predetermined voltage is applied to the common electrode, thereby forming a predetermined electric field between the common electrode and the pixel electrode. The arrangement angle of the liquid crystal injected between the first substrate 4a and the second substrate 4b is changed by such an electric field, and the light transmittance is changed according to the changed arrangement angle to display a desired image.

However, since the first display panel 4 is a liquid crystal display panel, a backlight assembly 50 for irradiating light under the panel to display an image will be provided.

The backlight assembly 50 includes a mold frame 16, light emitting diodes 12, a light emitting diode substrate 14, a light guide plate 18, a reflector plate 20, and optical sheets 10.

Here, the light emitting diodes 12 generate light having a predetermined brightness in response to a driving signal from the light emitting diode substrate 14, and the light guide plate 18 receives light supplied from the light emitting diodes 12 from the liquid crystal display panel ( 4) Supply to. That is, the light guide plate 18 supplies the light supplied from its side to the first display panel 4 positioned above it.

In addition, the reflector 20 is located on the rear surface of the light guide plate 18 to re-inject light incident from the light guide plate 18 to the light guide plate 18. That is, the reflective plate 20 improves the light efficiency by resupplying the light incident on the light guide plate 18, and the first optical sheets 10 improve the brightness of the light supplied from the light guide plate 18. The liquid crystal display panel 4 is supplied to the liquid crystal display panel 4.

In addition, the light emitting diode substrate 14 is connected to the first printed circuit board 24 and supplies a driving signal to the light emitting diodes 12 in response to a control signal supplied from the first printed circuit board 24, and a mold frame. The light emitting diode substrate 14 on which the light emitting diode 12 is mounted is received and fixed to the first display panel 4 and the backlight assembly 50.

The bezel 22 is fixed to the mold frame 16 under the mold frame 16, and an opening is formed in a portion of the center of the bezel 22 so that the second display panel 30 can be inserted. .

Next, the second printed circuit board 26 receives a driving signal from an external driving circuit (not shown). To this end, the second printed circuit board 26 has a connector 28. The connector 28 is integrally fixed to another connector attached to an external driving circuit to receive a driving signal from an external driving circuit, and the second printed circuit board 26 supplied with the driving signal is connected to the driving signal supplied to the connector 28. Correspondingly, various control signals are generated.

Accordingly, the first printed circuit board 24 is connected to the second printed circuit board 26 through the first pad part 38 formed on the second printed circuit board 26, which is not shown in the flexible printed circuit board. The FPCB is connected to the integrated circuit 6 and the light emitting diode substrate 14 of the first display panel 4. The first printed circuit board 24 connected to the integrated circuit 6 and the light emitting diode substrate 14 may correspond to the integrated circuit 6 and the light emitting diode in response to control signals supplied from the second printed circuit board 26. It serves to drive the substrate 14.

In addition, in the exemplary embodiment of the present invention, the second display panel 30 is implemented as an organic light emitting display panel, and the second display panel 30 includes the first substrate 30a and the second substrate 30b. do.

Accordingly, organic light emitting diodes (not shown) are disposed on the second substrate 30a in a matrix form, and the organic light emitting diodes generate light having a predetermined luminance in response to the amount of current supplied thereto. The second display panel 30 is connected to the second printed circuit board 26 by the second pad part 36 of the fusible printed circuit board 32. Here, an integrated circuit 34 is mounted on the fusible printed circuit board 32, and the integrated circuit 34 responds to control signals supplied from the second printed circuit board 26 to display the second display panel 30. ), A predetermined image is displayed.

In this case, although not shown in the present embodiment, the integrated circuit 34 of the second display panel may be provided with a protective layer to prevent intrusion from moisture and external light.

Although the present invention has been described primarily with reference to the above embodiments, many other possible modifications and variations can be made without departing from the spirit and scope of the invention. For example, the material and thickness of the sealant may be changed, the method of applying the sealant, the change of the application apparatus, and the like.

The flat panel display according to the present invention has an effect of effectively preventing moisture and light from penetrating into the driving integrated circuit by forming a protective layer on the driving integrated circuit mounted on the display panel.

In addition, since a separate light shielding tape may not be used, the process may be simplified, and the flat panel display may be slimmed down.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (10)

In a flat panel display panel in which a driving integrated circuit is mounted in a chip on glass (COG) method, A flat panel display panel comprising a protective layer on the driving integrated circuit to block external light and moisture. The method of claim 1, And the protective layer has a light transmittance of 0.05% or less. The method of claim 2, And the protective layer is black. The method of claim 1, And the protective layer is formed by mixing carbon black with a silicone adhesive. At least one display panel; A driving integrated circuit provided on the display panel in a chip on glass (COG) manner to drive the display panel; And And a protective layer for blocking external light and moisture irradiated to the driving integrated circuit. The method of claim 5, And the protective layer has a light transmittance of 0.05% or less. The method of claim 5, And the protective layer is black. The method of claim 5, And the protective layer is formed of a material selected from the group consisting of carbon black mixed with a silicone adhesive. The method of claim 5, The display panel may include a first display panel on the one surface; And And a second display panel provided on the other surface. The method of claim 5, And a bezel further supporting each display panel between the first display panel and the second display panel.

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