KR100480162B1 - Touch panel integrated liquid crystal panel - Google Patents

Abstract

The present invention relates to a touch panel integrated liquid crystal panel which prevents shaking of touch points caused by an AC common voltage signal of the liquid crystal panel.

The touch panel integrated in the liquid crystal panel according to the present invention includes a liquid crystal panel including a plurality of liquid crystal cells provided at intersections of gate lines and data lines, and a corresponding touch by touching a projected image from the liquid crystal panel with a pen or a finger. A touch panel generating a coordinate signal for a point, a transparent electrode layer formed between the touch panel and the liquid crystal panel to prevent the AC common voltage supplied to the liquid crystal panel from being induced to the touch panel, and on the transparent electrode layer. A metal electrode bar is formed and connected to the base potential.

Description

Touch panel integrated with liquid crystal panel {TOUCH PANEL INTEGRATED LIQUID CRYSTAL PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch panel integrated liquid crystal panel, and more particularly, to a touch panel integrated liquid crystal panel which prevents a touch point shake caused by an AC common voltage signal of the liquid crystal panel.

The touch panel includes a cathode ray tube (hereinafter referred to as "CRT"), a liquid crystal display (hereinafter referred to as "LCD"), and a field emission display (hereinafter referred to as "FED"). , Plasma display panel (hereinafter referred to as "PDP") and electroluminescent device ("Electro Luminescence Device" as "ELD"), etc. A computer peripheral device that presses a touch panel to input predetermined information into a computer.

Herein, the touch panel integrated with the liquid crystal panel in the liquid crystal display will mainly be described.

In general, as shown in FIG. 1, in the liquid crystal display on which the touch panel is mounted, the touch panel 2, the liquid crystal panel 1, and the backlight 3 are all independently present. (2) should be connected to the touch controller 7 by a signal line FPC, which in turn should be electrically connected to the computer body 5.

Referring to this operation, when the upper portion of the touch panel 2 is touched with a predetermined pressure or more, the voltage value at the position is calculated by the touch controller 7 to recognize the coordinates.

FIG. 2 illustrates a liquid crystal panel in which the resistive touch panel of FIG. 1 is mounted.

Referring to FIG. 2, the liquid crystal panel 2 is positioned between the upper polarizer 4a and the lower polarizer 4b, and the touch panel 1 is placed on the upper polarizer 4a. The liquid crystal panel 2 has the liquid crystal 16 and the ball spacer 8 injected between the lower glass substrate 6b and the upper glass substrate 6a. The gate line 8, the insulating film 10, the pixel electrode 12b, and the first alignment layer 14b are sequentially formed on the lower glass substrate 6b. The upper glass substrate 6a has a black matrix 22, a color filter 20, a common electrode 12a, and a second alignment layer 14a sequentially formed on its lower surface. The upper and lower glass substrates 6a and 6b are spaced apart by the ball spacers 18 so as to be maintained at regular intervals so that the liquid crystal 16 has a uniform thickness.

The touch panel 1 has a spacer 30 formed between an upper substrate 24a and a lower substrate 24b made of polyethylene terephthalate (hereinafter referred to as "PET") film. The first transparent conductive film 25a is formed on the bottom surface of the upper substrate 24a, and the second transparent conductive film 25b is formed on the surface of the lower substrate 24b. The first and second transparent conductive films 25a and 25b include indium tin oxide (hereinafter referred to as "ITO") and indium zinc oxide (Indium-Zinc-Oxide); (Hereinafter referred to as "IZO") and indium-tin-zinc-oxide (hereinafter referred to as "ITZO"). First and second electrode layers (not shown) are formed on the first and second transparent conductive films 25a and 25b. The first electrode layer is shorted with the second electrode layer when the upper substrate 24a is pressed by a stylus pen or finger, so that a signal having a current amount or voltage level that varies depending on the pressed position is generated. In this case, the first and second electrode layers are formed by printing silver (Ag), copper (Cu), and the like on the first and second transparent conductive films 25a and 25b which are transparent conductive materials.

3 is a block diagram showing a configuration of a general liquid crystal display device.

Referring to FIG. 3, a liquid crystal display device includes a liquid crystal panel 38 in which liquid crystal cells are arranged in a matrix form, a data driver 36 for supplying a data signal to data lines DL of the liquid crystal panel 38, and a liquid crystal panel 38. And a gate controller 34 for sequentially driving the gate lines GL of the liquid crystal panel 38, and a timing controller 32 for controlling the data driver 36 and the gate driver 34.

In the liquid crystal panel 38, liquid crystal is injected between two glass substrates, and the gate lines GL and the data lines DL are orthogonal to each other on the lower glass substrate. A TFT for selectively supplying an image input from the data lines DL to the liquid crystal cell Clc is formed at the intersection of the gate lines GL and the data lines DL. For this purpose, the TFT has a gate terminal connected to the gate line GL, and a source terminal connected to the data line DL. The drain terminal of the TFT is connected to the pixel electrode of the liquid crystal cell Clc.

The timing controller 32 supplies a data signal of red (R), green (G), and blue (B) from the outside to the data driver 36. In addition, the timing controller 32 generates a data control signal (Dclk, etc.) and a gate control signal (GSP, etc.) by using the horizontal / vertical synchronization signals (H, V) input from the outside, and the data driver 36 and the gate. The driving timing of the driver 34 is controlled.

The gate driver 34 sequentially generates scan pulses in response to a gate control signal such as a gate start pulse GSP input from the timing controller 32 to supply a gate high voltage to the gate line during the corresponding syringe period (1H). In the remaining period, a gate low voltage is applied. The video data on the data line DL is supplied to the pixel electrode of the liquid crystal cell Clc by the TFT in response to the scan pulse input from the gate driver 34.

The data driver 36 latches the red (R), green (G), and blue (B) digital video data in synchronization with a data control signal such as a dot clock (Dclk) input from the timing controller 32. The latched data is converted into analog data using the gamma voltage Vγ and supplied to the data line DL.

On the other hand, small liquid crystal panels such as PDAs and IMT-2000 have polarities of voltages charged in liquid crystal cells in units of horizontal lines on the liquid crystal panel as shown in FIGS. 4A and 4B to reduce power consumption. Then, it is driven in a line inversion manner so that its polarity is inverted again according to the frame.

In the line inversion scheme, as shown in FIG. 5, the common voltage signal Vcom that is AC-driven in two horizontal periods is used.

The common voltage signal waveform is switched as shown in FIG. 5 through the common electrode of the liquid crystal panel 38.

The film type touch panel is integrated on the line-in-version liquid crystal panel and used in a personal portable terminal or an IMT-2000 device as shown in FIG. 1.

At this time, the lower sheet 24b formed of a PET film in the film type touch panel 1 is formed very thin, 200 μm or less. For this reason, the common voltage signal Vcom of the AC waveform is induced on the second transparent conductive film 25b of the touch panel 1 from the common electrodes Vcom and 12a of the upper panel of the liquid crystal panel 2 to form the touch panel 22. It will act as noise in the operation.

Due to this noise, as shown in FIG. 6, the point where the touched point of the image projected on the touch panel 1 from the liquid crystal panel 2 with a stylus pen or a finger is shaken.

Accordingly, an object of the present invention is to provide a touch panel integrated with a liquid crystal panel to prevent the AC voltage signal supplied to the liquid crystal panel from being induced into the touch panel to prevent the touch point shaking phenomenon.

In order to achieve the above object, a touch panel integrated in a liquid crystal panel according to an exemplary embodiment of the present invention includes a liquid crystal panel including a plurality of liquid crystal cells provided at intersections of gate lines and data lines, and is projected from the liquid crystal panel. A touch panel generating a coordinate signal for a corresponding touch point by touching an image with a pen or finger, and an AC common voltage formed between the touch panel and the liquid crystal panel to be induced into the touch panel. And a transparent electrode layer which is prevented, and a metal electrode bar formed on the transparent electrode layer and connected to the ground potential.

The touch panel includes a lower substrate having an upper substrate having a first electrode bar formed on the first transparent conductive film, a lower electrode having a second electrode bar formed to face the substrate and formed on the second transparent conductive film, and an upper substrate and a lower substrate. It characterized in that it comprises a spacer to be spaced at a predetermined interval.

The upper substrate is formed of polyethylene terephthalate (PET).

The lower substrate is formed of any one of polyethylene terephthalate (PET), glass and plastic.

The first and second transparent conductive films are indium-tin-oxide, indium-zinc-oxide, and indium-tin-zinc oxide, which are transparent conductive materials. -Zinc-Oxide) is characterized in that it is formed of any one.

The transparent electrode layer may be a transparent conductive material, indium-tin-oxide, indium-zinc-oxide, indium-tin-zinc-oxide. Characterized in that any one of them.

The metal electrode bar is formed in the outer region of the transparent electrode layer.

The metal electrode bar is characterized in that the resistance component is lower than the transparent conductive material ITO.

The metal electrode bar is formed of at least one of silver (Ag) and copper (Cu).

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 7 to 9.

In the present invention, the liquid crystal display device in which the touch panel is mounted includes the touch panel 2, the liquid crystal panel 1, and the backlight 3 independently as described with reference to FIG. 1. ) Must be connected to the touch controller 7 by a signal line FPC, which in turn must be electrically connected to the computer body 5. In addition, when the signal line is connected to the touch controller 7, the signal line is inserted into and connected to the connector.

When the operation thereof is described, when the upper part of the touch panel 2 is touched with a predetermined pressure or more, the voltage value at the position is calculated by the touch controller 7 to recognize the coordinates.

The liquid crystal panel is driven by the configuration of a general liquid crystal display device as shown in FIG. The liquid crystal display device includes a liquid crystal panel 38 in which liquid crystal cells are arranged in a matrix, a data driver 36 for supplying a data signal to data lines DL of the liquid crystal panel 38, and a liquid crystal panel 38. A gate driver 34 for sequentially driving the gate lines GL, and a timing controller 32 for controlling the data driver 36 and the gate driver 34.

In the liquid crystal panel 38, liquid crystal is injected between two glass substrates, and the gate lines GL and the data lines DL are orthogonal to each other on the lower glass substrate. A TFT for selectively supplying an image input from the data lines DL to the liquid crystal cell Clc is formed at the intersection of the gate lines GL and the data lines DL. For this purpose, the TFT has a gate terminal connected to the gate line GL, and a source terminal connected to the data line DL. The drain terminal of the TFT is connected to the pixel electrode of the liquid crystal cell Clc.

The timing controller 32 supplies a data signal of red (R), green (G), and blue (B) from the outside to the data driver 36. In addition, the timing controller 32 generates a data control signal (Dclk, etc.) and a gate control signal (GSP, etc.) by using the horizontal / vertical synchronization signals (H, V) input from the outside, and the data driver 36 and the gate. The driving timing of the driver 34 is controlled.

The gate driver 34 sequentially generates scan pulses in response to a gate control signal such as a gate start pulse GSP input from the timing controller 32 to supply a gate high voltage to the gate line during the corresponding syringe period (1H). In the remaining period, a gate low voltage is applied. The video data on the data line DL is supplied to the pixel electrode of the liquid crystal cell Clc by the TFT in response to the scan pulse input from the gate driver 34.

The data driver 36 latches the red (R), green (G), and blue (B) digital video data in synchronization with a data control signal such as a dot clock (Dclk) input from the timing controller 32. The latched data is converted into analog data using the gamma voltage Vγ and supplied to the data line DL.

Small liquid crystal panels such as PDAs and IMT-2000s according to the present invention are driven by a line inversion method, and the line inversion method is applied with different polarities depending on the low line, that is, the gate line, on the liquid crystal panel. And inverted again according to the frame.

7 is a view showing a cross section of the touch panel integrated in the liquid crystal panel according to the present invention.

Referring to FIG. 7, the touch panel integrated with the liquid crystal panel according to the present invention includes a liquid crystal panel 40, a touch panel 64 for inputting a specific position by a stylus pen or a finger, and a liquid crystal panel 40. And a shielding layer 62 formed between the touch panel 64 and the metal electrode bar to prevent the AC common voltage signal from the liquid crystal panel 40 from being induced.

The liquid crystal panel 40 is positioned between the upper polarizer 42a and the lower polarizer 42b, and the touch panel 64 is placed on the shielding layer 62 formed on the upper polarizer 42a. The liquid crystal panel 40 has a liquid crystal 58 and a ball spacer 60 injected between the lower glass substrate 44b and the upper glass substrate 44a. The gate line 46, the insulating film 48, the pixel electrode 54b, and the first alignment layer 56b are sequentially formed on the lower glass substrate 44b. The upper glass substrate 44a has a black matrix 50, a color filter 52, a common electrode 54a, and a second alignment layer 56a sequentially formed on its lower surface. The upper and lower glass substrates 44a and 44b are spaced apart from each other by the ball spacers 55 so as to maintain a uniform thickness so that the liquid crystal 58 has a uniform thickness.

The touch panel 64 includes an upper substrate 66a made of PET film coated with a transparent conductive material on the front surface, a lower substrate 66b formed of any one of PET, glass, and plastic, and the upper and lower substrates 66a and 66b. It has a spacer 72 that is spread between. A first transparent conductive film 69a is formed on the bottom surface of the upper substrate 66a, and a second transparent conductive film 69b is formed on the surface of the lower substrate 66b. The first and second transparent conductive films 69a and 69b may include indium tin oxide (hereinafter referred to as "ITO") and indium zinc oxide (Indium-Zinc-Oxide); (Hereinafter referred to as "IZO") and indium-tin-zinc-oxide (hereinafter referred to as "ITZO"). First and second electrode bars 68a and 68b are formed on the first and second transparent conductive films 69a and 69b. The first electrode bar 68a is shorted with the second electrode bar 68b when the upper substrate 66a is pressed by a stylus pen or a finger so that a signal having a current amount or a voltage level that varies depending on the pressed position is generated. In this case, the first and second electrode bars 68a and 68b may be formed of silver (Ag), copper (Cu), or the like on the first transparent conductive film 69a and the second transparent conductive film 69b formed of a transparent conductive material. It is formed by printing.

The shielding layer 62 is formed by depositing any one of ITO, IZO, and ITZO, which are transparent conductive materials, between the liquid crystal panel 40 and the touch panel 64 on the entire liquid crystal panel 40. In this case, the shielding layer 62 is grounded with the ground GND to discharge the AC common voltage signal Vcom induced from the liquid crystal panel 40 so that the AC common voltage signal Vcom is induced to the touch panel 64. Will be prevented. Here, as the resistance value of the transparent conductive film used for the shielding layer 62 is relatively large, a resistance difference occurs depending on the position in the shielding layer 62. In other words, A close to ground GND has a small resistance, and B has a large resistance. That is, in A, the common voltage signal Vcom grounded to ground GND is easily discharged to ground GND, whereas the common voltage signal Vcom induced to B is gradually discharged, so that the common voltage signal ( Vcom) cannot be effectively prevented from being released to the touch panel 64. To prevent this, the transparent conductive film forms a low resistance metal electrode bar 63 that can compensate for a large resistance value in the outer region of the shielding layer 62. The metal electrode bar 63 effectively discharges the resistance difference between A and B to prevent the common voltage signal Vcom from the liquid crystal panel 40 from being induced to the touch panel 64 as well as at A. .

Meanwhile, as shown in FIG. 9, the shielding layer 62 in which the metal electrode bar 63 is formed in FIG. 7 is disposed between the upper glass substrate 84a and the upper polarizing plate 82a of the liquid crystal panel 64. It may be located.

As described above, the touch panel integrated in the liquid crystal panel according to the present invention includes a shielding layer on which metal electrode bars are formed, thereby preventing the AC common voltage supplied to the liquid crystal panel from being induced into the touch panel.

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.

1 is a view showing a liquid crystal panel on which a resistive touch panel is mounted.

FIG. 2 is a view illustrating a liquid crystal panel in which the resistive touch panel of FIG. 1 is mounted.

3 is a block diagram showing a configuration of a general liquid crystal display device.

4A and 4B illustrate polar patterns of liquid crystal panels;

5 is a diagram illustrating a common voltage signal waveform applied to a liquid crystal panel.

6 is a view showing a phenomenon that the touch point on the touch panel integrated in the liquid crystal panel according to the prior art is shaken.

7 is a cross-sectional view showing a touch panel integrated in the liquid crystal panel according to the present invention.

8 is a perspective view illustrating in detail the touch panel and the shielding layer illustrated in FIG. 7.

9 is a cross-sectional view showing a touch panel integrated with a liquid crystal panel according to another exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

1,64 touch panel 2,40 liquid crystal panel

2a: upper substrate 2b: lower substrate

3: backlight 4,42: polarizing plate

5: computer body 6,44: glass substrate

7: touch controller 8,46: gate line

10,48 insulating film 12a, 54a common electrode

5,55 pixel electrode 14,56 alignment film

16,58: liquid crystal 8,18: ball spacer

20,52: Color filter 22,50: Black matrix

24,66: touch panel 25, 69: transparent conductive film

68: electrode bar 63: metal electrode bar

30,72: spacer 32: timing controller

34: gate driver 36: data driver

38: liquid crystal panel 62: shielding layer

63: metal electrode bar

Claims (9)

A liquid crystal panel including a plurality of liquid crystal cells provided at intersections of gate lines and data lines; A touch panel for generating a coordinate signal for a corresponding touch point by touching the image projected from the liquid crystal panel with a pen or a finger; A transparent electrode layer formed between the touch panel and the liquid crystal panel to shield the AC common voltage supplied to the liquid crystal panel from being induced into the touch panel; And a metal electrode bar formed on the transparent electrode layer and connected to the base potential. The method of claim 1, The touch panel An upper substrate having a first electrode bar formed on the first transparent conductive film, A lower substrate formed to face the upper substrate and having a second electrode bar formed on a second transparent conductive film; And a spacer to allow the upper substrate and the lower substrate to be spaced apart at predetermined intervals. The method of claim 2, The upper substrate is a touch panel integrated with a liquid crystal panel, characterized in that formed of polyethylene terephthalate (PET). The method of claim 2, The lower substrate is a touch panel integrated with a liquid crystal panel, characterized in that formed of any one of polyethylene terephthalate (PET), glass and plastic. The method of claim 2, The first and second transparent conductive films are indium-tin-oxide, indium-zinc-oxide, and indium-tin-zinc oxide, which are transparent conductive materials. Touch panel integrated in the liquid crystal panel, characterized in that formed by any one of -Zinc-Oxide). The method of claim 1, The transparent electrode layer is an indium-tin-oxide, indium-zinc-oxide, and indium-tin-zinc-oxide, which are transparent conductive materials. Touch panel integrated in the liquid crystal panel, characterized in that formed by any one of them. The method of claim 6, The metal electrode bar is integrated in the liquid crystal panel, characterized in that formed in the outer region of the transparent electrode layer. The method of claim 7, wherein The metal electrode bar is a touch panel integrated with the liquid crystal panel, characterized in that the resistance component is lower than the transparent conductive material ITO. The method of claim 8, The metal electrode bar may be formed of at least one of silver (Ag) and copper (Cu).