KR20070044721A - Flat panel display device with touch panel - Google Patents

Abstract

The present invention relates to a flat panel display having a touch panel, and the screen can be displayed clearly even when a touch panel made of a film material is superimposed on the flat panel display panel such that a gap does not occur between the touch panel and the flat panel display panel.

In addition, since a gap is not formed between the substrate of the film material and the flat panel display panel assembly, there is no problem that the touch panel using the substrate of the film material malfunctions or the touch panel is damaged by an impact.

Flat Panel Display, Chassis, Touch Panel, Gap, Film

Description

Flat panel display having a touch panel {Flat Panel Display Having Touch Panel}

1 is a schematic cross-sectional view of a liquid crystal display device having a glass touch panel according to the prior art.

2 is a schematic cross-sectional view of a liquid crystal display device having a touch panel made of a film according to the prior art.

3 is a photo of the liquid crystal display of FIG. 2.

4 is a schematic cross-sectional view of a liquid crystal display device having a touch panel according to a first embodiment of the present invention.

5 is a photograph of the liquid crystal display of FIG. 4.

6 is a schematic cross-sectional view of a liquid crystal display device having a touch panel according to a second embodiment of the present invention.

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

11, 12: glass substrate for touch panel

11a, 12a, 110, 120: film substrate for touch panel

13, 130: spacer 21, 210: first substrate

22, 220: 2nd board | substrate 31, 310, 310a: chassis

320: pad

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device having a touch panel, and more particularly, to a flat panel display device having a touch panel for preventing a gap between a touch panel made of a film material and a flat panel display panel.

Computers, personal digital assistants (PDAs), portable multimedia players (PMPs), mobile phones, and handheld game consoles process text, movement, and other signals using various input devices such as numeric keys, keyboards, and mouse digitizers. Perform

In addition to the input device, a touch panel for inputting a signal on the display surface of the display device is widely used. The touch panel is installed on a display surface of a flat panel display device such as a liquid crystal display (LCD), a plasma display panel (PDP), organic light emitting diodes (OLED), and an image display device such as a cathode ray tube (CRT). It is used to allow a user to select desired information while viewing the image display device.

The touch panel may be classified into a resistive type, a capacitive type, an electromagnetic induction type, etc. according to a method of sensing a touch.

Among such touch panels, the resistive touch panel has a structure in which two transparent substrates for touch panels on which electrodes are formed are stacked with a predetermined space therebetween.

Here, when a pressure is applied to an upper substrate on which the upper electrode is formed by a pen or a finger, the upper electrode formed on the upper substrate and the lower electrode formed on the lower substrate are energized with each other, After reading the changed voltage value, the control device generates a signal corresponding to the position coordinate according to the change of the potential difference.

As the transparent substrate of the touch panel, a glass substrate is generally used, but recently, a film substrate of a resin material is mainly used for thinning the touch panel.

1 is a schematic cross-sectional view of a liquid crystal display device having a touch panel made of glass according to the prior art, FIG. 2 is a schematic cross-sectional view of a liquid crystal display device having a touch panel made of resin, and FIG. 3 is a liquid crystal display of FIG. Picture of the device.

A liquid crystal display device having a touch panel made of glass includes two glass substrates 11 and 12, a spacer 13, a color filter substrate 21 (hereinafter referred to as a first substrate) and a thin film transistor substrate (for a touch panel). 22) (hereinafter, referred to as a second substrate) and the chassis 31.

In the liquid crystal display, the first substrate 21 is stacked on the second substrate 22 and divided into a display area for displaying a screen and other non-display areas, and the chassis 31 is positioned on the non-display area. .

Here, the height of the chassis 31 positioned on the non-display area of the second substrate 22 is higher than the height of the first substrate 21. When the touch panel including two glass substrates 11 and 12 is positioned on the chassis 31 and the first substrate 21, a gap is formed between the touch panel and the first substrate 21. Therefore, even if pressure is applied to the glass touch panel, the pressure is not transmitted to the liquid crystal display panel due to the gap.

The liquid crystal display device provided with the touch panel made of resin includes the resin substrates, preferably the film substrates 11a and 12a, instead of the glass substrates 11 and 12.

In the liquid crystal display, the height of the chassis 31 positioned on the non-display area of the second substrate 22 is higher than the height of the first substrate 21, and the chassis 31 and the first substrate ( When the touch panel composed of two film substrates 11a and 12a is placed on the surface 21, a gap is formed between the edge portions of the film substrates 11a and 12a between the first substrate 21 and the film substrate. The center portions 11a and 12a come into contact with the first substrate 21 of the liquid crystal display panel.

Therefore, there is a problem in that the image display is not clear because a gap is formed at the edge of the screen display area as shown in the photo of FIG. 3. In addition, since a part of the gap is formed in the screen display area and a part of the gap is not formed, an error occurs in a signal input of the touch panel or the touch panel is damaged by an impact.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a flat panel display device having a touch panel in which the thickness of the flat panel display panel chassis is adjusted so that a gap does not occur between the touch panel made of a film material and the flat panel display panel. The purpose.

According to an aspect of the present invention for achieving the object of the present invention, a flat panel display panel formed by bonding a first substrate and a second substrate having a larger area than the first substrate; And a chassis formed to enclose an upper surface and a side surface of the non-display area of the second substrate, wherein the upper surface of the chassis is formed to be flush with the upper surface of the first substrate.

A pad may be formed between the rear surface of the chassis and the second substrate.

The pad is characterized in that formed with an adhesive.

The touch panel may further include a touch panel positioned on the same plane formed between the first substrate and the upper surface of the chassis.

The touch panel may include two substrates each having a transparent electrode formed on opposite surfaces thereof, and a spacer formed between the two substrates.

The substrate constituting the touch panel is characterized in that it comprises a film substrate.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to an accompanying drawing, embodiment of this invention is described in detail.

4 is a schematic cross-sectional view of a liquid crystal display device having a touch panel according to a first embodiment of the present invention, and FIG. 5 is a photograph of the liquid crystal display device of FIG. 4.

The liquid crystal display device includes two film substrates 110 and 120, a spacer 130, a color filter substrate 210 (hereinafter referred to as a first substrate) and a thin film transistor substrate 220 (hereinafter referred to as a second substrate) for a touch panel. ), Chassis 310 and pad 320. In addition, although not shown in the figure, the liquid crystal display includes a backlight assembly.

First, a liquid crystal display panel assembly including a first substrate 210, a second substrate 220, a chassis 310, and a pad 320 will be described.

The first substrate 210 has a black matrix and red, green, and blue color filters formed on a lower surface of an insulating substrate made of a transparent insulating material such as glass, and a color filter of red, green, and blue to prevent optical interference between cell regions. An overcoat film made of an organic material is formed, and a common electrode made of a transparent conductive material such as ITO or IZO is formed on the overcoat film.

The second substrate 220 may include a plurality of gate lines which transmit a gate signal on the light transmissive insulating substrate and extend in the first direction and have a predetermined interval in the second direction, a plurality of data lines formed to cross the gate line, And a pixel electrode formed in a cell region defined by the gate line and the data line.

In this case, the first substrate 210 is positioned on the upper surface of the second substrate 220 in the liquid crystal display panel, and the second substrate 220 is formed wider than the first substrate 210.

The liquid crystal display panel as described above is formed by combining the first substrate 210 and the second substrate 220 and forming a liquid crystal layer therebetween, by driving the thin film transistor formed on the first substrate 210 By orienting the liquid crystal, the transmittance of light is adjusted to display an image.

Here, the liquid crystal display panel is divided into a display area in which the first substrate 210 is stacked on the second substrate 220 to display a screen, and other non-display areas. The chassis 310 is disposed on the non-display area. And a pad 320 is mounted.

The chassis 310 is formed in a shape surrounding the top and side surfaces of the non-display area of the second substrate 220, and the pad 320 is the back surface of the chassis 310 and the non-display area of the second substrate 220. It is formed between a portion of the upper surface to fix the second substrate 220, and protects the electrode pattern that may be formed on the second substrate 220.

The pad 320 may be formed in part or the entirety of the non-display area, and the pad may be an adhesive or a double-sided tape.

In such a liquid crystal display panel, the chassis 310 and the pad 320 are further included to manufacture the liquid crystal display panel assembly.

In the liquid crystal display panel assembly according to the first embodiment of the present invention, an upper surface of the first substrate 210 and an upper surface of the chassis 310 are formed to be coplanar, so that the height of the non-display area and the height of the display area are the same. Is preferably the same. In other words, the chassis 310 positioned on the upper surface of the non-display area may have the same height as that of the portion where the chassis 310 is positioned on the upper surface of the non-display area of the second substrate 220 and the height of the first substrate 210 is the same. The sum of the thickness of the pad 320 and the thickness of the pad 320 is preferably equal to the thickness of the first substrate 310.

In this case, the height of the upper surface of the chassis 320 and the height of the first substrate 210 may be adjusted within a range that does not cause a malfunction such as a malfunction or gap of the touch panel positioned on the upper portion.

Since the liquid crystal display panel assembly does not emit light by itself, the liquid crystal display includes a backlight assembly that supplies light to the liquid crystal display panel assembly in addition to the liquid crystal display panel assembly.

Hereinafter, a backlight assembly (not shown) for supplying light to the liquid crystal display panel will be described.

The backlight assembly includes a light source, a light guide plate, and the like. The light source generates light, and the light guide plate receives light generated from the light source from the side surface, and changes the optical distribution of the light to surface light to emit the light.

Such a backlight assembly is located under the liquid crystal display panel assembly.

Next, a touch panel formed on the liquid crystal display panel assembly will be described with reference to FIGS. 4 and 5.

The touch panel according to the first embodiment of the present invention is a resistive touch panel, and includes an upper film substrate 110 and a lower film substrate 120 made of a poly ethylene terephtalate (PET) film or the like, and a space therebetween. It is composed of a spacer 130 and the like for keeping constant.

A transparent electrode having a constant resistance value is formed on the rear surface of the upper film substrate 110 (a surface facing the lower film substrate), and metal electrodes for supplying power in the Y-axis direction are formed on the upper and lower sides of the transparent electrode.

In addition, a transparent electrode having a constant resistance value is formed on a surface of the lower film substrate 120, and metal electrodes for supplying power in the X-axis direction are formed on left and right sides of the transparent electrode.

Here, an external signal line is connected to each of the metal electrodes for applying power or reading a voltage at a contact point. In addition, the spacers 130 are dispersed in the lower film substrate 120, and the upper film substrate 110 is overlapped so that the transparent electrodes face each other.

In the touch panel formed as described above, when a pen, a finger, or the like comes into contact with a point of the upper film substrate 110, the transparent electrodes formed on the upper and lower film substrates 110 and 120 contact with the point. At this time, a voltage is applied to the upper and lower sides of the transparent electrode through the signal line and the metal electrode, and the voltage value of the contacted point is read.

The upper film substrate 110 and the lower film substrate 120 are formed to have the same width as the second substrate 220 to completely cover the top surface of the liquid crystal display panel assembly.

As described above, the liquid crystal display panel assembly according to the first exemplary embodiment of the present invention is formed such that an upper surface of the first substrate 210 and an upper surface of the chassis 310 are coplanar to form a non-display area. The height and the height of the display area are the same.

If the height of the non-display area is too low in the liquid crystal display panel assembly than the display area, the touch panel made of a film material is bent due to the step between the display area and the non-display area, which may cause malfunction in the touch panel. In addition, when the height of the non-display area is too high than the display area, a gap is formed between the touch panel made of a film material and the first substrate 210 of the display area.

However, in the liquid crystal display panel assembly according to the first embodiment of the present invention, even if the substrates 110 and 120 made of the film material completely cover the upper surface thereof, as shown in the photograph of FIG. No gap is formed between the panels.

Accordingly, even when the touch panel of the film material is placed on the liquid crystal display panel assembly, the screen can be displayed cleanly, and the problem such as the touch panel malfunctioning or the touch panel being damaged by the impact does not occur.

6 is a schematic cross-sectional view of a liquid crystal display device having a touch panel according to a second embodiment of the present invention.

The liquid crystal display device according to the second embodiment of the present invention differs from the first embodiment in that it does not use a pad.

The description of the same parts as in the first embodiment of the present invention will be omitted here.

The liquid crystal display according to the second exemplary embodiment of the present invention includes two film substrates 110 and 120, a spacer 130, a color filter substrate 210 (hereinafter referred to as a first substrate), and a thin film transistor substrate for a touch panel. 220 (hereinafter referred to as a second substrate) and a chassis 310a.

Instead of using a pad, the chassis 310a according to the second embodiment of the present invention is formed to be thicker as much as the portion where the pad 320 is formed in the chassis 310 according to the first embodiment.

In the exemplary embodiment of the present invention, the liquid crystal display device is described as an example. However, the present invention is not limited thereto, and other flat panel display panels such as an OLED or a PDP and a flat panel display device having the same may have the same effect.

The scope of the present invention is not limited to each embodiment described above, but all changes and improvements made by those skilled in the art using the basic concept of the present invention defined in the claims also belong to the scope of the present invention.

As described above, the flat panel display device including the flat panel display panel assembly and the touch panel according to the present invention can display the screen clearly even when the substrate of the film material is superimposed on the flat panel panel assembly.

In addition, since a gap is not formed between the substrate of the film material and the flat panel display panel assembly, there is no problem that the touch panel using the substrate of the film material malfunctions or the touch panel is damaged by an impact.

Claims (6)

A flat panel display panel formed by bonding a first substrate and a second substrate having a larger area than the first substrate; And A chassis formed to surround upper and side surfaces of the non-display area of the second substrate, And a top surface of the chassis to be flush with the top surface of the first substrate. The method according to claim 1, And a pad formed between the rear surface of the chassis and the second substrate. The method according to claim 2, And the pad is formed of an adhesive. The method according to any one of claims 1 to 3, And a touch panel on the same plane formed between the first substrate and the upper surface of the chassis. The method according to claim 4, The touch panel includes two substrates each having a transparent electrode formed on opposite surfaces thereof, and a spacer formed between the two substrates. The method according to claim 5, The substrate constituting the touch panel comprises a film substrate.

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