KR20110021313A - Display device and input device - Google Patents

Abstract

PURPOSE: A display device and an input device are provided to efficiently cut off the noises transferred to a touch panel by reducing the resistance between a conductive film and a ground through two contact members. CONSTITUTION: A display panel comprises: a first substrate; a second substrate arranged on the first substrate; a conductive film arranged on the second substrate; a first connection member(150) connecting the conductive film the first substrate; and a second connection member(160) connecting the first conductive film and the first substrate. A circuit board is connected to the first substrate and includes a ground(310). The first substrate includes a first wire(111) connecting the first connection member to the ground, and a second wire(112) connecting the second connection member to the ground.

Description

DISPLAY DEVICE AND INPUT DEVICE}

Embodiments relate to a display device and an input device.

BACKGROUND With the development and popularization of graphical user interface (GUI) systems, the use of touchscreens with simple inputs has become commonplace.

The touch screen may adopt a resistive film method, a capacitive method, an optical sensor method, an ultrasonic method, an electromagnetic method, a vector force method, or the like.

The resistive film method is a method of operating the transparent conductive film 140 between two substrates in contact with each other and is easily implemented and excellent in touch screen methods. .

The optical sensor method is a method of determining a position when the optical path between the optical output device and the optical input device is blocked, and has a disadvantage of being affected by external light and a large circuit size because the circuit part is installed at the outer part.

Similar to the optical sensor method, the ultrasonic method or the surface acoustic wave method has a disadvantage in that it is vulnerable to noise or noise in the factory by determining the position when the acoustic path between the acoustic wave generating element and the acoustic wave recognition element is blocked.

The electromagnetic method is a method using the magnetism and the electromotive force generation principle of the Faraday law, and calculates the coordinates by determining the amount of current flowing through the unit coil for each position. Since a signal of alternating current must be applied to the coil, a special dedicated pen is needed.

The capacitive method is a method that detects the minute current flowing in response to the change in capacitance coupled between the sensor electrode and the finger and determines the position. However, the capacitive method is weak in noise signals, but it is strong in environmental reliability and changes the protective layer on the upper touch screen. Therefore, there is an advantage that the mechanical reliability can be changed freely. Capacitive methods can be divided into analog and digital methods.

The embodiment provides a display device and an input device that effectively block noise transmitted to a touch panel and do not require an additional shielding film.

In one embodiment, a display device includes: a display panel; And a touch panel disposed on the display panel, wherein the display panel comprises: a first substrate; A second substrate disposed on the first substrate; A conductive film disposed on the second substrate; A first connecting member connecting the conductive film and the first substrate; And a second connection member connecting the conductive film and the first substrate.

An input device according to an embodiment includes a display panel; And a touch panel disposed on the display panel, wherein the display panel comprises: a first substrate; A second substrate disposed on the first substrate; A conductive film disposed on the second substrate and having a sheet resistance of 0.1 Ω / m 2 to 100 Ω / m 2; And a circuit board connected to the first substrate and including a ground, wherein the conductive film is connected to the ground, and a resistance between the conductive film and the ground is 1 Ω to 20 kΩ.

In the display device and the input device according to the embodiment, the resistance between the conductive film and the ground connected to the conductive film is reduced by two connection members. Accordingly, the conductive film can effectively block noise transmitted to the touch panel, and the display device and the input device according to the embodiment do not need an additional shielding film.

In addition, since the conductive film has a low sheet resistance and has a low resistance between the conductive film and the ground, the display device and the input device according to the embodiment can effectively block noise and have improved sensitivity.

In the description of the embodiments, each panel, member, layer, pad or substrate or the like is described as being formed "on" or "under" of each panel, member, layer, pad or substrate or the like. In the case, “on” and “under” include both being formed “directly” or “indirectly” through other components. In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is a view showing a liquid crystal display device according to an embodiment. 2 is an exploded perspective view illustrating a touch panel. FIG. 3 is a cross-sectional view taken along the line A-A 'of FIG. 1.

1 to 3, the LCD includes a liquid crystal panel 100, a driver IC 200, a flexible printed circuit board (FPCB) 300, and a touch panel 400.

The liquid crystal panel 100 is disposed below the touch panel 400. The liquid crystal panel 100 displays an image in pixel units. The liquid crystal panel 100 includes a TFT substrate 110, a color filter substrate 120, a liquid crystal layer 130, a transparent conductive film 140, a first connection member 150, and a second connection member 160. Include.

The TFT substrate 110 is disposed below the color filter substrate 120. The TFT substrate 110 applies an electric field to the liquid crystal layer 130 in units of pixels. The TFT substrate 110 includes a plurality of gate lines, a plurality of common lines, a plurality of data lines, a plurality of thin film transistors, a plurality of pixel electrodes, a plurality of common electrodes, a first line 111, and The second wiring 112 is included.

The gate lines are arranged next to each other. The gate lines extend in one direction.

The common wires are connected to the common electrodes. The common lines may be disposed in parallel with the gate lines.

The data lines are arranged next to each other. The gate lines extend in a direction crossing the gate lines. The data lines cross the gate lines and define a plurality of pixels.

The thin film transistors are disposed in an area where the gate lines and the data lines cross. The thin film transistors are disposed in the pixels, respectively. The thin film transistors are driven by gate signals applied from the gate lines to selectively connect the data lines and the pixel electrodes.

The pixel electrodes are disposed in the pixels. The pixel electrodes receive a data signal through the data lines.

The common electrodes are disposed in the pixels. The common electrodes receive a common voltage through the common wiring.

The pixel electrodes and the common electrodes may be alternately disposed. By the electric field formed between the pixel electrodes and the common electrodes, the liquid crystal of the liquid crystal layer 130 may be aligned, and the liquid crystal layer 130 may have different optical characteristics in units of pixels.

Accordingly, the liquid crystal panel 100 may display an image by adjusting the intensity of light passing through the pixel unit.

The pixel electrodes and the common electrodes are disposed on the same substrate. That is, the pixel electrodes and the common electrodes are included in the TFT substrate 110. That is, the liquid crystal panel 100 is an IPS mode liquid crystal panel 100.

The first wiring 111 connects the first connection member 150 and the flexible printed circuit board 300. The first wiring 111 is in direct contact with the first connection member 150 and is connected to the flexible printed circuit board 300.

The second wiring 112 connects the second connection member 160 and the flexible printed circuit board 300. The second wire 112 is in direct contact with the second connection member 160 and is connected to the flexible printed circuit board 300.

The first wiring 111 and the second wiring 112 are made of a metal or an alloy having a low resistance. For example, the first wiring 111 and the second wiring 112 may include copper, aluminum, tungsten, molybdenum, titanium, or an alloy thereof.

The first wiring 111 and the second wiring 112 have a wide width. The width of the first wiring 111 and the second wiring 112 may be about 1 μm to about 50 μm. In addition, the resistance of the first wiring 111 and the second wiring 112 may be about 1Ω to about 1kΩ.

The color filter substrate 120 is disposed on the TFT substrate 110. The color filter substrate 120 includes a plurality of color filters and a black matrix pattern.

The color filters are disposed corresponding to the pixels, respectively. The color filters filter white light passing through and convert the light into color light.

The black matrix pattern blocks light passing through the black matrix pattern. The black matrix pattern is disposed in an outer region of the pixels.

The liquid crystal layer 130 is interposed between the color filter substrate 120 and the TFT substrate 110. The liquid crystal layer 130 is aligned by an electric field formed between the pixel electrodes and the common electrodes.

The liquid crystal panel 100 further includes a sealing member interposed between the TFT substrate 110 and the color filter substrate 120 to seal the liquid crystal layer 130.

The transparent conductive layer 140 is disposed on the color filter substrate 120. The transparent conductive film 140 is transparent and is a conductor. Examples of the material used as the transparent conductive layer 140 may include indium tin oxide (ITO) or indium zinc oxide (IZO).

The transparent conductive film 140 has a low sheet resistance. For example, the sheet resistance of the transparent conductive layer 140 may be about 0.1Ω / m 2 to about 100Ω / m 2. In addition, the transparent conductive film 140 may have a thickness of about 100 kPa to about 500 kPa.

The transparent conductive layer 140 may be coated on an upper surface of the color filter substrate 120. In more detail, the transparent conductive layer 140 may be coated on the entire upper surface of the color filter substrate 120. That is, the transparent conductive film 140 is interposed between the color filter substrate 120 and the touch panel 400.

The first connection member 150 connects the transparent conductive film 140 and the first wiring 111. The first connection member 150 is in direct contact with the transparent conductive film 140 and the first wiring 111. The first connection member 150 is disposed over the top surface of the transparent conductive film 140, the side surface of the color filter substrate 120, and the top surface of the first wiring 111.

The second connection member 160 connects the transparent conductive layer 140 and the second wiring 112. The second connection member 160 is in direct contact with the transparent conductive film 140 and the second wiring 112. The second connection member 160 is disposed over the top surface of the transparent conductive film 140, the side surface of the color filter substrate 120, and the top surface of the second wiring 112.

The first connecting member 150 and the second connecting member 160 may be made of a conductor. Examples of the material used for the first connecting member 150 and the second connecting member 160 include silver, an alloy thereof, and the like. For example, the first connecting member 150 and the second connecting member 160 may be silver solder paste.

The driver IC 200 is disposed on the TFT substrate 110. The driver IC 200 is mounted on the TFT substrate 110. The driver IC 200 drives the liquid crystal panel 100. The driver IC 200 applies the gate signal, the data signal, and the common voltage to the liquid crystal panel 100.

The flexible printed circuit board 300 is connected to the liquid crystal panel 100. In more detail, the flexible printed circuit board 300 is connected to the TFT substrate 110. Elements for driving the liquid crystal panel 100 may be included, and a driving signal may be applied to the driver IC 200 through the TFT substrate 110.

The flexible printed circuit board 300 includes a ground 310 having a reference potential, a first connection line 320, and a second connection line 330.

The ground 310 may be connected to elements included in the driver IC 200 and the flexible printed circuit board 300. The ground 310 may absorb an electrical shock applied from the outside.

The first connection line 320 connects the ground 310 and the first line 111. The second connection wire 330 connects the ground 310 and the second wire 112. The first connection line 320 and the second connection line 330 have a low resistance.

The transparent conductive layer 140 is connected to the ground 310 through the first connection member 150, the first wiring 111, and the first connection wiring 320. In addition, the transparent conductive layer 140 is connected to the ground 310 through the second connection member 160, the second wiring 112, and the second connection wiring 330.

The resistance between the transparent conductive layer 140 and the ground 310 is about 1 Ω to about 20 kΩ. That is, the first connection member 150, the first wiring 111, the first connection wiring 320, the second connection member 160, the second wiring 112, and the second connection wiring. 330 is connected in parallel, the resistance of such a parallel connection may be about 1 Ω to about 20 kΩ.

In the present exemplary embodiment, the transparent conductive layer 140 is connected to the ground 310 by two connection members 150 and 160. However, the present invention is not limited thereto, and three or more connection members may be transparent. It may be used to connect the conductive layer 140 and the ground 310.

The touch panel 400 is disposed on the liquid crystal panel 100. The touch panel 400 senses a signal such as a touch input from the outside. The touch panel 400 includes a lower substrate 410, an upper substrate 420, and an adhesive layer 430. In addition, the touch panel 400 may further include a circuit board 440 to be connected to a driver such as a system.

The lower substrate 410 faces the upper substrate 420. The lower substrate 410 includes a first transparent substrate 411 and first transparent electrodes 412.

The first transparent substrate 411 is transparent and is an insulator. Examples of the material used as the first transparent substrate 411 include glass or plastic.

The first transparent electrodes 412 are disposed on the first transparent substrate 411. The first transparent electrodes 412 are arranged in a plurality of columns in a first direction. The first transparent electrodes 412 are connected to each other in the first direction.

The upper substrate 420 is disposed on the lower substrate 410. The upper substrate 420 includes a second transparent substrate 421 and second transparent electrodes 422.

The second transparent substrate 421 is transparent and is an insulator. Examples of the material used as the second transparent substrate 421 include glass or plastic.

The second transparent electrodes 422 are disposed under the second transparent substrate 421. The second transparent electrodes 422 are arranged in a plurality of rows in a second direction. The second transparent electrodes 422 are connected to each other in the second direction.

In addition, the second transparent electrodes 422 may be alternately disposed so as not to overlap with the first transparent electrodes 412.

The adhesive layer 430 is interposed between the lower substrate 410 and the upper substrate 420. The adhesive layer 430 is an insulator and bonds the lower substrate 410 and the upper substrate 420. In addition, the adhesive layer 430 insulates between the lower substrate 410 and the upper substrate 420.

The touch panel 400 senses capacitance with a touched finger. That is, the touch panel 400 senses a capacitance between the finger and the first transparent electrodes 412 and senses a capacitance between the finger and the second transparent electrodes 422.

That is, the touch panel 400 senses the positions of the first transparent electrodes 412 where the capacitance is sensed and senses the touched X coordinate. Similarly, the touch panel 400 senses the positions of the second transparent electrodes 422 on which the capacitance is sensed, and senses the touched Y coordinate.

In the liquid crystal display according to the exemplary embodiment, the resistance between the transparent conductive layer 140 and the ground 310 is reduced by two or more connection members 150 and 160. Accordingly, the transparent conductive film 140 can efficiently block the noise transmitted to the touch panel 400.

In addition, since the resistance between the transparent conductive layer 140 and the ground 310 is low, the transparent conductive layer 140 may perform the function of the ground 310.

In addition, the liquid crystal display according to the embodiment does not require an additional shielding film. That is, the lower substrate 410 and the transparent conductive layer 140 may directly face each other. In other words, nothing may be interposed between the lower substrate 410 and the transparent conductive layer 140.

In addition, the transparent conductive film 140 has a low sheet resistance and has a low resistance between the transparent conductive film 140 and the ground 310. Accordingly, the transparent conductive layer 140 can efficiently absorb noise, and the liquid crystal display according to the embodiment can receive a signal such as an external touch with improved sensitivity.

The liquid crystal display according to the embodiment is an input device for sensing a touch such as a finger. That is, the liquid crystal display according to the embodiment is a display device for displaying an image, and at the same time, it is an input device that receives a signal from the outside.

In addition, the features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

Although described above with reference to the embodiment is only an example and is not intended to limit the invention, those of ordinary skill in the art to which the present invention does not exemplify the above within the scope not departing from the essential characteristics of this embodiment It will be appreciated that many variations and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

1 is a view showing a liquid crystal display device according to an embodiment.

2 is an exploded perspective view illustrating a touch panel.

FIG. 3 is a cross-sectional view taken along the line A-A 'of FIG. 1.

Claims (10)

Display panel; And A touch panel disposed on the display panel; The display panel A first substrate; A second substrate disposed on the first substrate; A conductive film disposed on the second substrate; A first connecting member connecting the conductive film and the first substrate; And And a second connection member connecting the conductive layer and the first substrate. The circuit board of claim 1, further comprising a circuit board connected to the first substrate and including a ground. The first substrate is A first wiring connecting the first connection member and the ground; And And a second wiring connecting the second connection member and the ground. The display device of claim 2, wherein the first wiring and the second wiring comprise a metal element or a metal alloy. The display device of claim 2, wherein the resistance between the ground and the conductive layer is between 1 Ω and 20 kΩ. The display device of claim 1, wherein the display panel is a liquid crystal panel in an IPS mode. The display device of claim 1, wherein the conductive layer is coated on the second substrate. The display device of claim 1, wherein the sheet resistance of the conductive film is 0.1 Ω / m 2 to 100 Ω / m 2. The display device of claim 1, wherein the conductive layer has a thickness of about 100 kV to about 500 kPa. The display device of claim 1, wherein the touch panel senses capacitance. Display panel; And A touch panel disposed on the display panel; The display panel A first substrate; A second substrate disposed on the first substrate; A conductive film disposed on the second substrate and having a sheet resistance of 0.1 Ω / m 2 to 100 Ω / m 2; And A circuit board connected to the first substrate and including a ground; The conductive layer is connected to the ground, and the resistance between the conductive layer and the ground is 1 Ω to 20 kΩ.

Images