KR20080019384A - Display device having touch screen panel - Google Patents

Abstract

A display device attached with a touch screen panel is provided to offer stability without influence on change of ambient pressure and prevent screen defect such as a watermark on the display device even if a decompression condition is formed in an ambient environment. A display assembly(2000) displays an image, and a touch screen panel(1000) is attached to an upper sash(400) of the display assembly and inputs information to the display assembly. A pressure adjuster connects the outside with a space between the touch screen panel and the display assembly. The pressure adjuster includes a penetration hole(600a) penetrating thickness of the touch screen panel vertically at one side of the touch screen panel. The pressure adjuster includes a sub penetration hole(600b) penetrating a plain part(400a) of the upper sash and is formed to a position aligned to the penetration hole.

Description

Display device having a touch screen panel

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

2 is a plan view of a liquid crystal display device with a touch screen panel according to a first embodiment of the present invention.

3 is a partial cross-sectional view taken along the line AA ′ of the liquid crystal display device with the touch screen panel of FIG. 2.

4 is a plan view of a liquid crystal display device with a touch screen panel according to a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional view taken along line B-B 'of the LCD device to which the touch screen panel of FIG. 4 is attached.

6 is a plan view of a liquid crystal display device with a touch screen panel according to a modification of the second embodiment of the present invention.

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

100: top plate 200: bottom plate

300: adhesive member 400: upper chassis

750a: thin film transistor 750b: color filter substrate

S: space D: space

600a, b, c: through hole

1000: touch screen panel 2000: display assembly

3000: attachment member

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device with a touch screen panel, and more particularly, to a display device with a touch screen panel which does not generate a screen defect such as a watermark even under reduced pressure.

The touch screen panel is a new input method that can replace an input method such as a mouse or a keyboard, and is a new input method that can directly input information on a screen using a hand or a pen. In particular, since the touch screen panel can directly perform a desired task while the user views the screen and can be easily operated by anyone, it is evaluated as the most ideal input method under the GUI (Graphical User Interface) environment. It is widely used in various fields such as banks, government offices, various medical equipment, tourism, and guidance of major institutions. The touch screen panel is used in combination with a screen display device such as a liquid crystal display device.

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

Referring to FIG. 1, the touch screen panel 10 is attached to the liquid crystal display device 20 by an adhesive tape 30. As such, when the touch screen panel 10 is attached to the liquid crystal display device 20, a space is formed between the upper surface of the liquid crystal display device 20 and the touch screen panel 10, and when the space is decompressed, the touch screen Often, the panel 10 and the upper surface of the liquid crystal display 20 are in close contact with each other.

For example, the adhesion gap between the touch screen panel 10 and the liquid crystal display device 20 becomes smaller, thereby attaching the touch screen panel 10 to the liquid crystal display device 20, and at the same time, the touch screen panel 10 and the liquid crystal display. Since the space between the display devices 20 is reduced to create a condition close to vacuum, the touch screen panel 10 may be bent and attached to the upper surface of the liquid crystal display device 20 (indicated by a dotted line).

In addition, when moving to a high place with a portable module such as an airplane, a hot air balloon, or a mountain climbing, when the decompression condition is created by the surrounding environment, the space between the touch screen panel 10 and the liquid crystal display device 20 becomes close to a vacuum and thus the touch screen. The panel 10 may be in close contact with the upper surface of the liquid crystal display 20. More specifically, the external pressure and the air pressure in the module of the liquid crystal display device 20 are in equilibrium. However, since the air pressure in the module of the liquid crystal display device 20 is high when flying at a high altitude (low pressure) for a long time, The touch screen panel 10 is leaked to the outside and adsorbed on the upper surface of the liquid crystal display device 20 to cause stains. (These stains are referred to as "water marks.") Because of this high air, the air should be introduced into the liquid crystal display 20, but the air inflow space is insufficient, so that the adsorption phenomenon of the touch screen panel 10 is maintained for a long time, causing a problem in that the screen quality deteriorates.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a display device with a stable touch screen panel which is not affected by changes in ambient pressure.

Another object of the present invention is to provide a display device having a touch screen panel which does not generate a screen defect such as a watermark on the display device even when a decompression condition is formed in the surrounding environment.

The present invention for achieving the above object is a display assembly for displaying an image, a touch screen panel for inputting information into the display assembly, an adhesive member for attaching the touch screen panel and the display assembly, It includes a pressure control unit for communicating with the outside the space between the touch screen panel and the display assembly.

The pressure controller includes a through hole formed on at least one side of the touch screen panel to penetrate the touch screen panel in a thickness direction.

The touch screen panel is attached to the upper chassis of the display assembly.

The pressure regulator includes an auxiliary through hole penetrating the planar portion of the upper chassis, and the auxiliary through hole is formed at a position aligned with the through hole.

The planar portion of the upper chassis extends in the direction of the first through hole and may be adjusted in length to open the first through hole.

Preferably, the planar portion of the upper chassis is formed with a recess to open the first through hole corresponding to the first through hole.

Preferably, the pressure controller is formed in plural on the outer portion of the display device.

The display assembly may include a liquid crystal display panel.

Preferably, the through hole has a diameter of 1 to 5 mm.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. Like reference numerals in the drawings refer to like elements.

2 is a plan view of a liquid crystal display device with a touch screen panel according to a first embodiment of the present invention, and FIG. 3 is a partial cross-sectional view taken along the line AA ′ of the liquid crystal display device with a touch screen panel of FIG. 2.

2 and 3, a liquid crystal display device with a touch screen panel according to a first embodiment of the present invention includes a display assembly 2000 for displaying an image and an input for inputting information to the display assembly 2000. Of the space between the touch screen panel 1000, the attachment member 3000 for attaching the touch screen panel 1000 and the display assembly 2000, and the touch screen panel 1000 and the display assembly 2000. It includes a pressure regulator for adjusting the pressure.

The touch screen panel 1000 includes an upper plate 100, a lower plate 200, and an adhesive member 300 for adhering the upper plate 100 and the lower plate 200. The adhesive member 300 is preferably a double-sided tape. At this time, the upper plate 100 is mainly made of a flexible film material, the lower plate 200 is mostly made of a glass material having an ITO film is formed and has a supporting force. In addition, a touch sensor (not shown) is disposed between the upper plate 100 and the lower plate 200, and the upper plate 100 on which the image is output is a touch area in which information can be input using a hand or a pen. In this case, when a touch input is applied to the touch area, the top sensor 100 is pressed and the touch sensor reacts to calculate coordinates of the point and recognize the position.

The touch screen panel of the present invention is not limited thereto, and various types of touch screen panels may be used.

The display assembly 1000 may include a liquid crystal display panel 750 for displaying an image, a driving circuit unit 800 for driving the liquid crystal display panel 750, and a backlight unit for irradiating light to the liquid crystal display panel 750. 950, a mold frame 920 fixedly supporting the liquid crystal display panel 750 and the backlight unit 950, and a lower chassis 900 and an upper chassis 400 accommodating the components. .

The liquid crystal display panel 750 is injected between the thin film transistor substrate 750a, the color filter substrate 750b disposed to face the thin film transistor substrate 750a, and between the thin film transistor substrate 750a and the color filter substrate 750b. A liquid crystal layer (not shown). The display device may further include a polarizer 780 formed to correspond to the upper portion of the color filter substrate 750b and the lower portion of the thin film transistor substrate 750a.

Here, the color filter substrate 750b is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process. A common electrode (not shown) made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO) is formed on the front surface of the color filter substrate 750b.

The thin film transistor substrate 750a is a transparent glass substrate on which a thin film transistor (TFT) and a pixel electrode are formed in a matrix form. The data line is connected to the source terminal of the TFTs, and the gate line is connected to the gate terminal. Further, a pixel electrode (not shown) made of a transparent electrode made of a transparent conductive material is formed in the drain terminal. When an electrical signal is input to the data line and the gate line, each TFT is turned on or turned off to apply an electrical signal necessary for pixel formation to a drain terminal.

That is, as described above, when power is applied to the gate terminal and the source terminal of the thin film transistor substrate 750a and the TFT is turned on, an electric field is formed between the pixel electrode and the cavity electrode of the color filter substrate 750b. Due to this electric field, the arrangement of the liquid crystal injected between the thin film transistor substrate 750a and the color filter substrate 750b is changed, and the light transmittance is changed according to the changed arrangement to obtain a desired image.

The driving circuit unit 800 is connected to the data line and the gate line of the thin film transistor substrate 750a to apply the data driving signal and the gate driving signal to the thin film transistor. In this embodiment, although the driving circuit unit 800 is mounted on the thin film transistor substrate 750a, the driving circuit unit 800 is not limited thereto and may be connected to the thin film transistor substrate through, for example, a tape carrier package through various connection methods.

The backlight unit 950 is a light source for generating light and includes a lamp unit and a reflector disposed under the lamp unit. In this case, the lamp unit may further include a diffusion sheet and an optical sheet.

The lower chassis 900 is formed in a box shape of a rectangular parallelepiped with an upper surface open to form a storage space having a predetermined depth therein. That is, the lower chassis 900 includes a chassis bottom surface and first to fourth chassis sidewalls extending vertically from each edge from the chassis bottom surface. In this case, a reflecting plate may be formed on the bottom surface and the sidewall of the lower chassis 900. The first to fourth chassis sidewalls may be formed in a '-' shape to improve coupling force with other components. In the lower chassis 900, the backlight unit 950 and the liquid crystal display panel 750 are sequentially seated and received.

The mold frame 920 is formed in a rectangular frame shape and includes a flat portion and sidewall portions bent at right angles therefrom. The liquid crystal display panel 750 is mounted on the flat part, and the backlight unit 950 including the optical sheet, the diffusion sheet, and the lamp unit is fixed between the mold frame 920 and the lower chassis 900. In this case, the mold frame 920 may be joined by the liquid crystal display panel 750 and the adhesive tape 700a disposed above the flat portion. Similarly, the liquid crystal display panel 750 and the backlight unit 950 disposed under the liquid crystal display panel 750 may be attached and bonded by an adhesive tape 700a. The adhesive tape 700a may serve as a foreign matter prevention member that prevents foreign matter from entering into the gap between the parts. In addition, the mold frame 920 may be provided with a stepped portion or a fixing protrusion for mounting or fixing each component.

The upper chassis 400 is configured in the form of a rectangular window frame having a flat portion 400a and a side wall portion 400b bent at right angles therefrom. The planar portion 400a of the upper chassis 400 supports a portion of an edge of the liquid crystal display panel 750 at a lower portion thereof, and the sidewall portion 400b is coupled to face the sidewalls of the lower chassis 900. The upper chassis 400 and the lower chassis 900 are preferably made of metal having excellent strength, light weight, and low deformation. In this case, the lower surface of the upper surface of the upper chassis 400 and the liquid crystal display panel 750 may be attached and bonded by an adhesive tape 700b. As the adhesive tape 700b, a double-sided tape may be used, and may function as a foreign matter preventing member that absorbs foreign matter introduced from the outside. The adhesive tape 700b may be formed on at least a portion of the lower surface of the upper surface of the upper surface of the upper chassis 400.

The touch screen panel 1000 and the display assembly 2000 are attached and coupled by the attachment member 3000. Adhesive tape is mainly used as the attachment member 3000. When the touch screen panel 1000 and the display assembly 2000 are attached and coupled as described above, the bottom surface of the touch screen panel 1000, that is, the bottom surface of the lower plate 200 and the top surface of the display assembly 2000, that is, the liquid crystal display panel Between the upper surfaces of the polarizing plate 780 of 750 is spaced at a predetermined interval (D) and a minute spacing space (S) is generated. As such, a pressure controller is formed to adjust the pressure of the space S between the touch screen panel 1000 and the display assembly 2000. In other words, the pressure control unit is formed so that the space (S) in communication with the outside to balance the pressure of the space (S) with the pressure of the external environment. The pressure controller includes a through hole 600 penetrating at least a portion of the touch screen panel 1000 and the display assembly 2000 to communicate with the space S.

The pressure adjusting part penetrates through the outer side of the touch screen panel 1000 in the thickness direction through the first through hole 600a and one side of the upper chassis 400 of the display assembly 2000 in the thickness direction. The second through hole 600b is included. The second through hole 600b communicates with the first through hole 600a so that the air moves smoothly, and the flat part 400a of the upper chassis 400 corresponds to the position of the first through hole 600a. It is formed to align in and assists air distribution. In this case, a third through hole 600c communicating with the first and second through holes 600a and 600b is also formed in the attachment member 3000 to which the touch screen panel 1000 and the display assembly 2000 are attached. . Of course, when the attachment member 3000 is formed outside the first and second through holes, the third through hole 600c may not be formed.

As indicated by the arrow of the air flow in Figure 3, the air introduced through the through-hole 600 goes out through the empty space between the upper chassis 400 and the lower chassis 900. In addition, the outside air may be introduced into the separation space S through the through hole 600, and the air of the separation space S may be discharged to the outside. From this, the through-hole 600 balances the external pressure with the pressure in various internal spaces of the touch screen panel 1000 and the display assembly 2000. In particular, the pressure in the space S between the touch screen panel 1000 and the display assembly 2000 may be balanced with an external pressure.

Therefore, in the liquid crystal display device with a conventional touch screen panel, when the decompression occurs, the space S between the touch screen panel 1000 and the polarizer 780 is prevented from becoming close to the vacuum. In addition, the phenomenon in which the lower plate 200 of the touch screen panel 1000 and the polarizer 780 of the liquid crystal display panel 750 are in close contact by air introduced into the through hole 600 may be prevented. In addition, even though dust is introduced together with air through the through hole 600, the double-sided tape is adsorbed by adhesive tapes 700a and 700b attached to each component between the components of the liquid crystal display device. Inflow of foreign matter into the interior space can be prevented.

The through hole 600 is preferably formed to a diameter size of 1mm or more so that the outside air can be smoothly flow. However, when the diameter of the through hole 600 is too large, 5 mm or more, since a large amount of external foreign matter may be introduced together with air, the size of the through hole 600 may be about 1 to 5 mm in diameter.

In addition, the through hole 600 may be formed outside the touch screen panel 1000 by a predetermined distance from the display area where the screen of the liquid crystal display panel is displayed, and the through hole 600 is illustrated in FIG. 2. As shown, two may be formed on both sides of the liquid crystal display, a plurality of two or more may be formed, and one may be formed on one side of the liquid crystal display according to the degree of air circulation.

In the above, the through-hole 600b is formed in the upper chassis 400 of the display assembly 2000 together with the touch screen panel 1000, but the through-hole may not be formed in the upper chassis 400. Hereinafter, a liquid crystal display in which the through hole 600a is formed only in the touch screen panel 1000 will be described. Duplicate explanations are omitted.

4 is a plan view of a liquid crystal display device with a touch screen panel according to a second embodiment of the present invention. FIG. 5 is a partial cross-sectional view taken along line B-B 'of the liquid crystal display device with a touch screen panel of FIG. 6 is a plan view of a liquid crystal display device with a touch screen panel according to a modification of the second embodiment of the present invention.

4 and 5, a liquid crystal display device having a touch screen panel according to a second embodiment of the present invention includes a touch screen panel 1000, a display assembly 2000, the touch screen panel 1000, and the touch screen panel 1000. And an attachment member 3000 for attaching the display assembly 2000.

The touch screen panel 1000 includes a top plate 100 made of a film material, a bottom plate 200 on which a transparent ITO film is formed as a conductive material, and an adhesive member 3000 for bonding the top plate 100 and the bottom plate 200 to each other.

A through hole 600a penetrating through the upper plate 100, the lower plate 200, and the adhesive member 300 in a thickness direction is formed in an outer side of the touch screen panel 1000 in the thickness direction, and the upper chassis ( The through hole is not formed in 400. At this time, the length of the plane portion 400a of the upper chassis 400 is shortened so that the plane portion 400a does not cover the through hole 600a. That is, the inner end of the planar portion 400a of the upper chassis 400 is formed to substantially coincide with the sidewall of the through hole 600a. Of course, at this time, the inner end of the planar portion 400a may overlap with the through hole 600a within a range where air flow is not disturbed. Therefore, in the present exemplary embodiment, the through hole 600a of the touch screen panel 1000 may communicate with the internal space without forming the through hole in the upper chassis 400.

On the other hand, when the length of the planar portion 400a of the upper chassis 400 is reduced in correspondence to the region where the through hole 600a is formed as described above, the planar portion 400a of the upper chassis 400 of the region is Since the lower portion of the liquid crystal display panel 750 cannot support a portion of the edge, the force supporting the liquid crystal display panel 750 may be reduced. Accordingly, a buffer support member may be further provided between the liquid crystal display panel 750 and the touch screen panel 1000. In addition, as shown in FIG. 6, the recess 400c may be formed in the upper chassis 400 in the region where the through hole 600 is formed. From this, the through-air 600 and the concave portion 400c distribute the outside air and the internal space of the liquid crystal display device, and the flat portion 400a of the upper chassis 400 is located below the liquid crystal display panel 750. Make it possible to support a portion of the edge of the.

The through-hole 600 and the inner space of the liquid crystal display device communicate with each other by the through-hole 600 formed as described above and the upper chassis 400 which reduces the length of the planar portion corresponding to the through-hole 600. Inlet and discharge of outside air is possible. In addition, the outside air may be introduced into the separation space S between the touch screen panel 1000 and the display assembly 2000 through the through hole 600, and the air in the separation space S may be discharged to the outside. have. From this, the external pressure and the pressure of various internal spaces of the touch screen panel 1000 and the display assembly 2000 are balanced through the through hole 600. In particular, the pressure in the space S between the touch screen panel 1000 and the display assembly 2000 may be balanced with an external pressure.

Therefore, in the liquid crystal display device with a conventional touch screen panel, when the decompression occurs, the space S between the touch screen panel 1000 and the polarizer 780 is prevented from becoming close to the vacuum. In addition, the phenomenon that the lower plate 200 of the touch screen panel 1000 and the polarizing plate 780 of the liquid crystal display panel 750 are in close contact by the air introduced into the through hole 600 of the present invention, Even when the pressure is reduced, the space S between the touch screen panel 1000 and the polarizer 780 may be constantly maintained. Therefore, a screen defect such as a watermark generated when the touch screen panel 1000 and the polarizer 780 are in close contact with each other does not occur.

Although the above embodiments have been described with an example of a liquid crystal display, the communication structure for communicating the internal space of the liquid crystal display with the outside by forming a through hole in the touch screen panel of the present invention is not only a liquid crystal display but also a touch screen panel. Applicable to various types of display devices attached to the display device

Although described above with reference to the drawings and embodiments, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit of the invention described in the claims below. I can understand.

As described above, the present invention can eliminate the pressure difference between the external pressure and the separation space by forming a through hole in the touch screen panel for adjusting the pressure of the separation space between the touch screen panel and the display assembly.

In addition, the present invention can prevent the contact between the lower surface of the touch screen panel and the upper surface of the display assembly, it is possible to maintain a constant distance between the touch screen panel and the display assembly even when the pressure.

In addition, the present invention does not produce a screen defect such as a watermark generated when the touch screen panel and the display assembly are in close contact even when the pressure is reduced, thereby obtaining a high quality display quality.

Claims (9)

A display assembly for displaying an image, A touch screen panel for inputting information into the display assembly; An adhesive member for attaching the touch screen panel to the display assembly; And a pressure control unit communicating a space between the touch screen panel and the display assembly to the outside. The method according to claim 1, The pressure adjusting unit includes a through hole formed on at least one side of the touch screen panel to penetrate the touch screen panel in a thickness direction. The method according to claim 2, The touch screen panel is attached to the upper chassis of the display assembly. The method according to claim 3, The pressure control unit includes an auxiliary through hole penetrating the planar portion of the upper chassis, and the auxiliary through hole is formed at a position aligned with the through hole. The method according to claim 3, And a flat portion of the upper chassis extending in the direction of the first through hole and having a length adjusted to open the first through hole. The method according to claim 3, And a concave portion is formed in the planar portion of the upper chassis to open the first through hole corresponding to the first through hole. The method according to claim 1, And a plurality of pressure regulating parts formed at an outer portion of the display device. The method according to claim 1, The display assembly includes a liquid crystal display panel. The method according to claim 2, The through hole has a diameter of 1 to 5 mm.

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