KR20030055859A - Touch panel integrated liquid crystal panel driven line inversion type - Google Patents

Abstract

PURPOSE: A touch panel united to a line inversion type LCD panel is provided to prevent the noise such as a point thrift phenomenon due to a common voltage signal switching from the LCD panel when the touch panel united to the line inversion type LCD panel is driven. CONSTITUTION: The LCD panel(40) includes a plurality of liquid crystal cells prepared to each crossing of a gate line and a data line. The touch panel(64) recognizes the position information by directing an image projected from the LCD panel(40) with a stylus pen or a finger. A shield layer(52) reduces the common voltage signal wave style influence of the LCD panel(40) by installing between the touch panel(64) and the LCD panel(40). A surface of the LCD panel(40) includes an upper and a lower polarizing sheet(42a,42b).

Description

Touch panel integrated into line inversion liquid crystal panel {TOUCH PANEL INTEGRATED LIQUID CRYSTAL PANEL DRIVEN LINE INVERSION TYPE}

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 line inversion touch panel integrated liquid crystal panel which prevents point drift caused by a common voltage signal when driving the liquid crystal panel by a line inversion method.

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.

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.

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 polarizing sheet 4a and the lower polarizing sheet 4b, and the touch panel 1 is placed on the upper polarizing sheet 4a. The liquid crystal panel 2 has a liquid crystal material 16 and a ball spacer 18 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 ball spacer 18 is sprayed onto the first alignment layer 14b before the upper and lower glass substrates 6a and 6b of the above structure are bonded. These upper and lower glass substrates 6a and 6b are spaced apart from each other by the ball spacer 18 so as to be maintained at regular intervals. In other words, the ball spacer 18 allows the liquid crystal material 16 to have a uniform thickness by keeping the gap between the upper and lower glass substrates 6a and 6b uniform.

The touch panel 1 has a spacer 30 spread between the upper substrate 24a and the lower substrate 24b made of polyethylene terephthalate (hereinafter referred to as “PET”) film. The first electrode layer 26a is formed on the bottom surface of the upper substrate 24a, and the second electrode layer 26b is formed on the surface of the lower substrate 24b. The first electrode layer 26a is shorted with the second electrode layer 26b when the upper substrate 24a 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 layers 26a and 26b include indium tin oxide (hereinafter referred to as "ITO") and indium zinc oxide (Indium-Zinc-Oxide); It is formed by printing silver (Ag) on one of " IZO ") and indium-tin-zinc-oxide (hereinafter referred to as " ITZO ").

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 to generate the data driver 36 and the gate. The timing of the driver 34 is controlled. The data control signal is supplied to the data driver 36, and the gate control signal is supplied to the gate driver 34.

The gate driver 34 is configured to generate scan pulses sequentially in response to a gate control signal such as a gate start pulse GSP input from the timing controller 32, and to adjust the scan pulse voltage to drive the liquid crystal cell. Level shifter and the like for shifting to the level. The gate high voltage is supplied to the gate line between the syringes (1H), and the gate low voltage is applied during the remaining period. In response to the scan pulse input from the gate driver 34, video data on the data line DL is supplied to the pixel electrode of the liquid crystal cell Clc by the TFT.

The data driver 36 receives a data control signal such as a dot clock Dclk together with data signals of red (R), green (G), and blue (B) from the timing controller 32. 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), and then latches the latched data with a gamma voltage ( Vγ). The data driver 36 converts the data corrected by the gamma voltage Vγ into analog data and supplies the data lines DL by one line.

In the case of small liquid crystal panels such as personal digital assistants (PDAs) and IMT-2000, in order to reduce power consumption, polarities are applied differently according to the low lines, that is, gate lines, on the liquid crystal panel as shown in FIGS. 4A and 4B. The liquid crystal panel driving method of the line inversion method which is reversed again is used.

In the line inversion method, 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 inputted to be switched from the common electrodes Vcom and 12a of the upper panel of the liquid crystal panel 2 is partially induced in the touch panel 1 to act as noise in the operation of the touch panel 22. .

Such noise is caused by the common electrodes Vcom and 12a of the line inversion liquid crystal panel when the image projected on the touch panel 1 from the liquid crystal panel 2 is pressed by a stylus pen or a finger as shown in FIG. 6. The drift occurs at the point to be pressed by the common voltage signal waveform that is switched by.

Accordingly, an object of the present invention is to provide a line inversion liquid crystal panel to prevent noise such as point drift due to switching of a common voltage signal from the liquid crystal panel when driving the touch panel integrated with the line inversion liquid crystal panel. It is to provide an integrated touch panel.

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 a liquid crystal panel according to a line inversion method.

5 is a diagram illustrating a common voltage signal waveform applied to a liquid crystal panel according to a line inversion method.

FIG. 6 is a view illustrating a phenomenon in which a point on a touch panel integrated with a line inversion type liquid crystal panel according to the prior art is drifted.

7 is a cross-sectional view of a touch panel integrated in a line inversion liquid crystal panel according to a first embodiment of the present invention;

8 is a cross-sectional view of a touch panel integrated in a liquid crystal panel of a line inversion method according to a second exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

1,64,104: touch panel 2,40,80: liquid crystal panel

2a: upper substrate 2b: lower substrate

3: backlight 4,42: polarizing sheet

5: computer body 6, 44: glass substrate

7: touch controller 8,46,86: gate line

10,48,88: insulating film 12a, 54a, 94a: common electrode

12b, 54b, 94b: pixel electrode 14, 56: alignment film

16,58,98: liquid crystal material 18,60,100: ball spacer

20,52,92: Color filter 22,50,90: Black matrix

24,66,106: touch panel substrate 26,68,108: electrode layer

30,72,112: spacer 32: timing controller

34: gate driver 36: data driver

38: liquid crystal panel 62, 102: shielding layer

70: adhesive layer

In order to achieve the above object, a touch panel integrated in a line inversion type 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 from the liquid crystal panel. A touch panel for directing the projected image with a stylus pen or finger to recognize information at a corresponding position; and a shielding layer formed between the touch panel and the liquid crystal panel to attenuate the influence of the common voltage signal waveform of the liquid crystal panel. It is provided.

In the present invention, the upper and lower polarizing sheets are provided on the surface of the liquid crystal panel.

In the present invention, the shielding layer is composed of one of ITO, IZO, and ITZO, which are transparent conductive materials, and is grounded.

A touch panel integrated in another line inversion type 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 stylus pen for projecting an image projected from the liquid crystal panel. Or a touch panel which is instructed by a finger to recognize the information of the corresponding position, and a shielding layer which is formed in the liquid crystal panel to reduce the influence of the common voltage signal waveform of the liquid crystal panel.

In the present invention, the touch panel includes upper and lower substrates, upper and lower electrode lines formed on the upper and lower substrates, and formed between the upper and lower substrates and the upper and lower electrode lines. Upper and lower transparent conductive layers through which the lower electrode lines are energized, and spacers to separate the upper and lower substrates at predetermined intervals.

The liquid crystal panel surface of the present invention is characterized in that the upper and lower polarizing sheets are provided.

In the present invention, the shielding layer in the liquid crystal panel is positioned between the liquid crystal panel and the upper polarizing sheet.

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 and 8.

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 timing of the driver 34 is controlled. The data control signal is supplied to the data driver 36, and the gate control signal is supplied to the gate driver 34.

The gate driver 34 is configured to generate scan pulses sequentially in response to a gate control signal such as a gate start pulse GSP input from the timing controller 32, and to adjust the scan pulse voltage to drive the liquid crystal cell. It consists of a level shifter for shifting to a level. The gate high voltage is supplied to the gate line between the syringes (1H), and the gate low voltage is applied during the remaining period. In response to the scan pulse input from the gate driver 34, video data on the data line DL is supplied to the pixel electrode of the liquid crystal cell Clc by the TFT.

The data driver 36 receives a data control signal such as a dot clock Dclk together with data signals of red (R), green (G), and blue (B) from the timing controller 32. 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), and then latches the latched data with a gamma voltage ( Vγ). The data driver 36 converts the data corrected by the gamma voltage Vγ into analog data and supplies the data lines DL by one line.

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.

FIG. 7 is a cross-sectional view of a touch panel integrated with a liquid crystal panel of a line inversion method according to a first exemplary embodiment of the present invention.

Referring to FIG. 7, a touch panel integrated in a line inversion liquid crystal panel may include 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 ( A shielding layer 62 is provided between the touch panel 64 and the touch panel 64 to reduce the influence of the common voltage signal from the liquid crystal panel 40.

The liquid crystal panel 40 is positioned between the upper polarizing sheet 42a and the lower polarizing sheet 42b, and the touch panel 64 is placed on the shielding layer 62 formed on the upper polarizing sheet 42a. The liquid crystal panel 40 has a liquid crystal material 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 ball spacer 60 is sprayed onto the first alignment layer 56b before the upper and lower glass substrates 44a and 44b of the above structure are bonded. The upper and lower glass substrates 44a and 44b are spaced apart from each other by the ball spacers 60 to maintain the same at regular intervals. In other words, the ball spacer 60 maintains a uniform thickness between the upper and lower glass substrates 44a and 44b so that the liquid crystal material 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. The first electrode layer 68a is formed on the bottom surface of the upper substrate 66a, and the second electrode layer 68b is formed on the surface of the lower substrate 66b. The first electrode layer 68a is shorted with the second electrode layer 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. The upper and lower substrates 66a and 66b are bonded by the adhesive layer 70 after the insulating layer for electrical insulation between the electrode layers 68a and 68b is formed.

In this case, the first and second electrode layers 68a and 68b may include indium tin oxide (hereinafter referred to as “ITO”) and indium zinc oxide (Indium-Zinc-Oxide); It is formed by printing silver (Ag) on one of " IZO ") and indium-tin-zinc-oxide (hereinafter referred to as " ITZO ").

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 prevent the common voltage signal waveform from the liquid crystal panel 40 from being induced to the touch panel 64.

8 is a cross-sectional view of a touch panel integrated in a line inversion liquid crystal panel according to a second exemplary embodiment of the present invention, wherein a shielding layer in FIG. 7 is disposed between an upper glass substrate and an upper polarizing sheet of the liquid crystal panel. It is characterized by the location.

Referring to FIG. 8, the touch panel integrated with the line inversion liquid crystal panel includes a liquid crystal panel 80, a touch panel 104 for inputting a specific position by a stylus pen or a finger, and a liquid crystal panel ( And a shielding layer 102 formed within the liquid crystal panel 80 to reduce the influence of the common voltage signal from the upper panel of the liquid crystal panel 80.

The liquid crystal panel 80 is positioned between the upper polarizing sheet 82a and the lower polarizing sheet 82b, and the touch panel 104 is placed on the upper polarizing sheet 82a. The liquid crystal panel 80 has a liquid crystal material 98 and a ball spacer 100 injected between the lower glass substrate 84b and the upper glass substrate 84a. The gate line 86, the insulating film 88, the pixel electrode 94b and the first alignment layer 96b are sequentially formed on the lower glass substrate 84b. The upper glass substrate 84a has a black matrix 90, a color filter 92, a common electrode 94a, and a second alignment layer 96a sequentially formed on its lower surface. The ball spacer 100 is sprayed onto the first alignment layer 96b before the upper and lower glass substrates 84a and 84b of the above structure are bonded. The upper and lower glass substrates 84a and 84b are spaced apart from each other by the ball spacer 100 so as to be maintained at regular intervals. In other words, the ball spacer 100 maintains a uniform thickness between the upper and lower glass substrates 84a and 84b so that the liquid crystal material 98 has a uniform thickness.

The shielding layer 102 is deposited between the upper glass substrate 84a of the liquid crystal panel 80 and the upper polarizing sheet 82a by depositing any one of ITO, IZO, and ITZO, which are transparent conductive materials, on the entire liquid crystal panel 80. Is formed. In this case, the shielding layer 102 is grounded with the ground GND to prevent the common voltage signal waveform from the liquid crystal panel 80 from being induced to the touch panel 104.

The touch panel 104 includes an upper substrate 106a made of PET film coated with a transparent conductive material on the front surface, a lower substrate 106b formed of any one of PET, glass, and plastic, and the upper and lower substrates 106a and 106b. It will have a spacer 112 that is spread between. The first electrode layer 108a is formed on the bottom surface of the upper substrate 106a, and the second electrode layer 108b is formed on the surface of the lower substrate 106b. The first electrode layer 108a is shorted with the second electrode layer 108b when the upper substrate 106a 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. The upper and lower substrates 106a and 106b are bonded by the adhesive layer 110 after the insulating layer for electrical insulation between the electrode layers 108a and 108b is formed.

In this case, the first and second electrode layers 108a and 108b are formed by printing silver (Ag) on one of ITO, IZO, and ITZO, which are transparent conductive materials.

As described above, the touch panel integrated in the liquid crystal panel according to the present invention uses a line inversion driving method to reduce power consumption in the case of small liquid crystals such as PDA and IMT-2000, or between the liquid crystal panel and the touch panel. By forming a shielding layer in the liquid crystal panel, it is possible to prevent the influence of the common voltage signal waveform applied to be switched to the common electrode to drive the line inversion scheme.

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

Claims (10)

A liquid crystal panel including a plurality of liquid crystal cells provided at intersections of gate lines and data lines; A touch panel for instructing the image projected from the liquid crystal panel with a stylus pen or a finger to recognize information of a corresponding position; And a shielding layer formed between the touch panel and the liquid crystal panel to reduce the influence of the common voltage signal waveform of the liquid crystal panel. The method of claim 1, The touch panel integrated with the liquid crystal panel of the line inversion method, characterized in that the upper and lower polarizing sheet on the surface of the liquid crystal panel. The method of claim 1, The liquid crystal panel has an upper plate and a lower plate, A liquid crystal material and a ball spacer injected between the upper and lower plates; The upper plate is configured such that an upper glass substrate, a black matrix, a color filter, a common electrode, and a first alignment layer are sequentially stacked. The lower plate is a touch panel integrated with a line inversion type liquid crystal panel, characterized in that the lower glass substrate, the gate line, the insulating film, the pixel electrode and the second alignment layer are sequentially stacked. The method of claim 1, The touch panel includes upper and lower substrates, Upper and lower electrode lines formed on the upper and lower substrates; Upper and lower transparent conductive layers formed between the upper and lower substrates and the upper and lower electrode lines to allow the upper and lower electrode lines to be energized; And a spacer to separate the upper and lower substrates at predetermined intervals. The method of claim 1, The shielding layer is formed of one of ITO, IZO, and ITZO, which are transparent conductive materials, and is integrated in a line inversion liquid crystal panel, wherein the touch panel is integrated. A liquid crystal panel including a plurality of liquid crystal cells provided at intersections of gate lines and data lines; A touch panel for instructing the image projected from the liquid crystal panel with a stylus pen or a finger to recognize information of a corresponding position; And a shielding layer formed in the liquid crystal panel to reduce the influence of the common voltage signal waveform of the liquid crystal panel. The method of claim 6, The touch panel includes upper and lower substrates, Upper and lower electrode lines formed on the upper and lower substrates; Upper and lower transparent conductive layers formed between the upper and lower substrates and the upper and lower electrode lines to allow the upper and lower electrode lines to be energized; And a spacer to separate the upper and lower substrates at predetermined intervals. The method of claim 6, The touch panel integrated with the liquid crystal panel of the line inversion method, characterized in that the upper and lower polarizing sheet on the surface of the liquid crystal panel. The method of claim 8, The shielding layer in the liquid crystal panel is a touch panel integrated with the liquid crystal panel of the line inversion method, characterized in that located between the liquid crystal panel and the upper polarizing sheet. The method of claim 6, The shielding layer is formed of one of ITO, IZO, and ITZO, which are transparent conductive materials, and is integrated in a line inversion liquid crystal panel, wherein the touch panel is integrated.