KR101114367B1 - Touch LCD Display - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch type liquid crystal display device. Since the touch sensing means is not present on the front surface of the liquid crystal panel but is formed inside the pixel of the liquid crystal panel, the image can be displayed to the outside without passing through the touch sensing means, thereby improving the quality of the image. The present invention relates to a touch type liquid crystal display device which is improved and reduces manufacturing costs since the touch sensing means is not provided as a separate component and embedded in the pixel.

Description

Touch type liquid crystal display device {TOUCH TYPE LIQUID CRYSTAL DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch type liquid crystal display device, and more particularly, to a touch type liquid crystal display device in which a touch sensing means is embedded in a pixel, thereby improving image quality and reducing manufacturing costs.

BACKGROUND ART In general, liquid crystal display devices have tended to be gradually widened due to their light weight, thinness, and low power consumption. Accordingly, the liquid crystal display device is widely used as a portable computer such as a notebook PC, office automation equipment, audio / video equipment, and the like.

In general, a liquid crystal display device displays a desired image on a screen by adjusting the amount of light transmitted according to pixel signals applied to a plurality of control switching elements arranged in a matrix.

The liquid crystal display includes a liquid crystal panel in which a color filter substrate as an upper substrate and a thin film transistor array substrate as a lower substrate are opposed to each other, and a liquid crystal layer is formed therebetween, and a scan signal and image information are supplied to the liquid crystal panel to operate the liquid crystal panel. It is configured to include a drive unit.

Recently, the demand for liquid crystal display devices with various functions to increase convenience is increasing. In particular, by attaching a touch sensing panel to the front of the liquid crystal panel and contacting the touch sensing panel without an input means such as a keyboard or a mouse. Research into liquid crystal display devices that can input characters or commands has been actively conducted.

However, since the touch sensing panel is attached to the front surface of the liquid crystal panel and the image of the liquid crystal panel is displayed to the outside through the touch sensing panel, there is a problem that the brightness of the image is reduced or the chromaticity is changed, thereby degrading the quality of the image. Since the sensing panel is provided as a separate component and attached to the front surface of the liquid crystal panel, there has been a problem of increasing the manufacturing cost of the liquid crystal display device.

The present invention is to solve the above problems of the prior art, an object of the present invention is to provide a high-quality image because the touch sensing means is located in the free space in the pixel does not reduce the brightness or change the chromaticity of the image In addition, since the touch sensing means is configured to be embedded in the liquid crystal panel, there is no need to provide a touch sensing means as a separate component, thereby providing a touch type liquid crystal display device in which manufacturing cost is reduced.

According to an aspect of the present invention, there is provided a touch type liquid crystal display device comprising: a first substrate on which a plurality of gate lines and data lines cross each other to define a plurality of pixels; A second substrate disposed to face the first substrate; The third charging capacity is provided for each pixel and the second charging capacity is added to the first charging capacity for driving the pixel, and the common electrode formed on the second substrate and the pixel electrode formed for each pixel on the first substrate are charged. A pixel capacitance formed with the liquid crystal layer interposed therebetween; And a discharge current output unit configured to be connected to a gate line for at least one pixel on the first substrate, and to receive and output a discharge current through the gate line when the pixel capacitance is discharged. And a capacitance change analyzer which receives the discharge current output from the discharge current output unit and analyzes a discharge current characteristic to determine whether an electromagnetic inductive element is approached. Characterized in that configured to include.

In accordance with another aspect of the present invention, there is provided a touch type liquid crystal display device comprising: a first substrate on which a plurality of gate lines and data lines cross each other to define a plurality of pixels; A position input electrode plate provided for at least one pixel and having an induced current or an induced voltage when the electromagnetic inductive element approaches; And an output unit which is formed to be connected to a position input electrode plate on the pixel on which the position input electrode plate is formed, and receives an induction current or an induction voltage from the position input electrode plate to determine whether or not the electromagnetic induction element is approached. It is configured to include.

In the touch type liquid crystal display according to the present invention having the above configuration, since the touch sensing means is not present on the front surface of the liquid crystal panel but is formed inside the pixel of the liquid crystal panel, the image can be displayed to the outside without passing through the touch sensing means. There is an effect of improving the quality of the image.

In addition, the touch type liquid crystal display according to the present invention having the above configuration has the effect of reducing the manufacturing cost since the touch sensing means is not provided as a separate component and embedded in the pixel.

1 is a plan view showing a plurality of pixels defined on a first substrate of a touch type liquid crystal display according to a first preferred embodiment of the present invention.
FIG. 2 is a cross-sectional view schematically illustrating a cross section of a thin film transistor and a pixel electrode of a pixel on a first substrate illustrated in FIG. 1, but also a common electrode on a second substrate for convenience of description.
3 is a plan view illustrating a plurality of pixels defined on a first substrate of a touch type liquid crystal display according to a second exemplary embodiment of the present invention.

Hereinafter, a touch type liquid crystal display according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>

First, the touch type liquid crystal display according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2 as follows.

FIG. 1 illustrates a plurality of pixels defined on a first substrate in a touch type liquid crystal display according to a first embodiment of the present invention, and FIG. 2 includes thin film transistors of pixels on the first substrate illustrated in FIG. 1. A cross section of the pixel electrode is schematically illustrated, but a common electrode on the second substrate is also shown for convenience of description.

1 and 2, in the touch type liquid crystal display according to the first exemplary embodiment, a plurality of gate lines 104 and data lines 105 intersect each other to define a plurality of pixels. A first substrate 101; A second substrate 102 disposed to face the first substrate 101; The third charging capacity is provided for each pixel and the second charging capacity is added to the first charging capacity for driving the pixel, and the pixel electrode 106 and the second substrate are formed for each pixel on the first substrate 101. A pixel capacitance in which the common electrode 108 formed on the 102 is formed with the liquid crystal layer 103 interposed therebetween; And a discharge current output unit configured to be connected to the gate line 104 for at least one pixel on the first substrate 101 and to receive and output a discharge current through the gate line 104 when the pixel capacitance is discharged. 109; And a capacitance change analyzer 110 that receives the discharge current output from the discharge current output unit 109 and analyzes discharge current characteristics to determine whether an electromagnetic induction element is approached. It is configured to include.

Each component of the touch type liquid crystal display according to the first embodiment of the present invention having the above configuration will be described in detail as follows.

1 and 2, the touch type liquid crystal display according to the first exemplary embodiment of the present invention includes a liquid crystal panel including a first substrate 101, which is a lower substrate, and a second substrate 102, which is an upper substrate. The liquid crystal layer 103 is formed between the first substrate 101 and the second substrate 102.

The plurality of gate lines 104 and the data lines 105 are formed to intersect on the first substrate 101 to define a plurality of pixels, and the gate lines 104 and the data lines 105 of each pixel cross each other. A thin film transistor 107 is formed in the region, and a pixel electrode 106 connected to the drain electrode of the thin film transistor 107 to receive a pixel signal is formed in each pixel.

In the thin film transistor 107, a gate electrode is connected to the gate line 104, a source electrode is connected to the data line 105, and a drain electrode is connected to the pixel electrode 106.

A common electrode 108 is applied to the second substrate 102 to receive the common voltage Vcom corresponding to all the pixel electrodes 106 on the first substrate 101.

The pixel electrode 106 on the first substrate 101 and the common electrode 108 on the second substrate 101 form pixel capacitance for each pixel with the liquid crystal layer 103 therebetween.

Each pixel is driven by charging and discharging the pixel capacitance provided in the pixel, and charging of the pixel capacitance is turned on by the scanning signal from the gate line 104. And the pixel signal from the data line 105 is input to the pixel electrode 106, and the discharge of the pixel capacitance is performed after the thin film transistor 107 is turned off.

The pixel charge capacity of each pixel is charged with a third charge capacity obtained by adding an extra second charge capacity to a first charge capacity for driving a pixel, and the second charge capacity is extremely small compared to the first charge capacity. It is preferable that it is a grade which does not affect driving. In this case, the second charge capacity is added to determine whether the electromagnetic inductive element is approached, and a detailed description thereof will be given below in the description of the discharge current output unit 109 and the discharge current analysis unit 110. Let's do it in detail.

Various examples of the method of charging the pixel capacitance with the third charge capacity obtained by adding the second charge capacity to the first charge capacity for driving the pixel may be possible. There is a way to change the level.

Referring to FIG. 1, a discharge current output unit 109 is formed in each pixel on the first substrate 101 to receive and output a discharge current through the gate line 104 when the pixel capacitance is discharged.

The discharge current output unit 109 operates when the pixel to which it belongs performs discharge, receives a discharge current from the gate line 104, and outputs the discharge current to the discharge current analyzer 110 through the transfer line 111. As a means to do this, for example, a switching element may be possible.

In addition, the touch type liquid crystal display according to the first exemplary embodiment of the present invention receives the discharge current output from the discharge current output unit 109 through the transfer line 111 and analyzes the discharge current characteristics to provide an electromagnetic induction device. Capacity change analysis unit 110 to determine whether or not the access is provided.

The capacitance change analyzer 110 may be provided on the first substrate 101 or may be provided separately from the first substrate 101 and may include a liquid crystal panel driver (not shown) for driving each pixel defined in the liquid crystal panel. It may be provided inside the) or may be provided separately from the liquid crystal panel driver.

The capacitance change analysis unit 110 determines whether the approach of the electrostatic induction device is made by analyzing the characteristics of the discharge current, particularly for the second charging capacity, among the discharge currents input from the discharge current output unit 109, When it is determined that the inductive element is approached, the coordinate data of the pixel is transmitted to a system (not shown) connected to the liquid crystal panel.

That is, when an electromagnetic induction element that generates a magnetic field approaches a specific pixel of the liquid crystal panel by a user, a change in the second charging capacity is particularly caused among the third charging capacitances charged in the pixel capacitance of the pixel. When the discharge current output unit 109 is driven during discharge and receives the discharge current and outputs the discharge current to the capacitance change analyzer 110, the capacitance change analyzer 110 analyzes the characteristics of the received discharge current to determine the characteristics of the electrostatic induction device. After determining whether the access is made, if it is determined that the approach of the electrostatic induction device is made, the coordinate data of the corresponding pixel is transmitted to the system connected to the liquid crystal panel, so that the screen conversion according to the touch operation of the user can be performed.

&Lt; Embodiment 2 >

Hereinafter, a touch type liquid crystal display according to a second exemplary embodiment of the present invention will be described with reference to FIG. 3.

As shown in FIG. 3, the touch type liquid crystal display according to the second exemplary embodiment of the present invention includes a first substrate in which a plurality of gate lines 204 and data lines 205 intersect to define a plurality of pixels. (Not shown); A position input electrode plate 209 provided in at least one pixel to have an induced current or an induced voltage when the electromagnetic inductive element approaches; And the electromagnetic induction element is approached by receiving an induction current or an induction voltage from the position input electrode plate 209 to be connected to the position input electrode plate 209 on the pixel on which the position input electrode plate 209 is formed. An output unit 210 for determining and outputting the determined value; It is configured to include.

Each component of the touch type liquid crystal display according to the second embodiment of the present invention having such a configuration will be described in detail as follows.

Although not shown in detail, the touch type liquid crystal display according to the second embodiment of the present invention includes a liquid crystal panel including a first substrate (not shown), which is a lower substrate, and a second substrate (not shown), which is an upper substrate. A liquid crystal layer (not shown) is formed between the first substrate and the second substrate.

On the first substrate, a plurality of gate lines 204 and data lines 205 are formed to cross each other to define a plurality of pixels, and a thin film is formed in an area where the gate lines 204 and the data lines 205 of each pixel cross each other. The transistor 207 is formed, and in each pixel, a pixel electrode 206 connected to the drain electrode of the thin film transistor 207 and receiving a pixel signal is formed.

The thin film transistor 207 has a gate electrode connected to the gate line 204, a source electrode connected to the data line 205, and a drain electrode connected to the pixel electrode 206.

In addition, a common electrode (not shown) to which the common voltage Vcom is applied corresponds to all pixel electrodes 206 on the first substrate on the second substrate.

The pixel electrode 206 on the first substrate and the common electrode on the second substrate form pixel capacitance for each pixel with a liquid crystal layer interposed therebetween.

Each pixel is driven by charging and discharging the pixel capacitance provided in the pixel, and charging of the pixel capacitance is turned on by the scanning signal from the gate line 204. And the pixel signal from the data line 205 is input to the pixel electrode 206, and the discharge of the pixel capacitance is performed after the thin film transistor 207 is turned off.

The pixel charge capacity of each pixel is charged with a third charge capacity obtained by adding an extra second charge capacity to a first charge capacity for driving a pixel, and the second charge capacity is extremely small compared to the first charge capacity. It is preferable that the degree does not affect the driving. In this case, the second charging capacity is added to determine whether the electromagnetic inductive element is approached, and a detailed description thereof will be described later in detail with respect to the position input electrode plate 209 and the output unit 210. .

Various examples of the method of charging the pixel capacitance with the third charge capacity obtained by adding the second charge capacity to the first charge capacity for driving the pixel are possible, but as an example, the level of the common voltage applied to the common electrode is changed. There is a way.

Referring to FIG. 3, a position input electrode plate 209 having an induced current or an induced voltage when an electromagnetic inductive element approaches from the outside is provided on at least one pixel on the first substrate.

The area of the position input electrode plate 209 may be designed in a range that can generate an appropriate induced current or induced voltage by the approach of the electromagnetic inductive element and at the same time minimizes the aperture ratio of the liquid crystal panel.

Is formed on the first substrate so as to be connected to the position input electrode plate 209 to the pixel on which the position input electrode plate 209 is formed to receive an induced current or an induced voltage from the position input electrode plate 209 to access the electromagnetic inductive element. The output unit 210 outputs through the output line 211 is determined by determining whether or not.

The output unit 210 does not generate an output when no induction current or induction voltage is input from the position input electrode plate 209, and outputs when induction current or induction voltage is input from the position input electrode plate 209. Various examples are possible within this range, and as an example, there is a diode having a threshold at which an output is generated when an induced current or an induced voltage from the position input electrode plate 209 is input in a forward or reverse direction. As a more specific example, there is a zener diode having a threshold value at which an output is generated when the induced current or the induced voltage from the position input electrode plate 209 is input in the reverse direction.

Since the electric field generated by the electromagnetic induction element used to perform the touch operation has a predetermined distribution similar to the Gaussian distribution, there is a fear of an error caused by a plurality of outputs 210 being detected when the electromagnetic induction element is approached. When the approach of the electromagnetic inductive element is made, the resistance load from the position input electrode plate 209 to the output unit 210 can be detected so that only one output unit 210 that is closest to it can be detected. It is desirable to design in consideration of the value.

As such, the output unit 210 generates an output when an induced current or an induced voltage is induced from the position input electrode plate 209 by the approach of the electromagnetic inductive element, and generates an output, the output of which is connected to a liquid crystal panel (not shown). Is delivered).

That is, when an electromagnetic induction element generating a magnetic field approaches a predetermined position of the liquid crystal panel by a user, an induced current or an induced voltage is generated at the position input electrode plate 209 adjacent to the approach position to be input to the output unit 210. The output unit 210 in which the induced current or the induced voltage is input is operated to generate an output and transferred to the system connected to the liquid crystal panel through the transmission line 211, so that the screen can be changed according to the user's touch operation. do.

According to the present invention having the first and second embodiments as described above, since a means for sensing a touch is formed inside a pixel of the liquid crystal panel rather than the front of the liquid crystal panel, an image may be displayed to the outside without passing through the touch sensing means. The quality of the image can be improved, and since the touch sensing means is formed inside the pixel instead of being provided as a separate component, manufacturing cost can be reduced.

101: first substrate 102: second substrate
103: liquid crystal layer 104, 204: gate line
105, 205: data lines 106, 206: pixel electrodes
107, 207: thin film transistor 108: common electrode
109: discharge current output unit 110: capacitance change analysis unit
111, 211: delivery line
209: position input electrode plate 210: output unit

Claims (14)

A first substrate on which a plurality of gate lines and data lines cross each other to define a plurality of pixels;
A second substrate disposed to face the first substrate;
A pixel capacitance in which the pixel electrode formed for each pixel on the first substrate and the common electrode formed on the second substrate are formed for each pixel with a liquid crystal layer interposed therebetween; And
A discharge current output unit formed to be connected to a gate line for at least one pixel on the first substrate and to receive and output a discharge current through the gate line when the pixel capacitance is discharged; And
A capacitance change analyzer to determine whether an electromagnetic inductive element is approached by analyzing discharge current characteristics by receiving the discharge current output from the discharge current output unit;
And,
The pixel capacitance is charged with a third charge capacity obtained by adding an extra second charge capacity to a first charge capacity for driving a pixel, and the second charge capacity is smaller than the first charge capacity,
Changing a level of a common voltage applied to the common electrode in order to charge the pixel capacitance with the third charge capacity in which the first charge capacity and the second charge capacity are added;
And the capacitance change analyzing unit receives a discharge current through a discharge current output unit and analyzes a change in discharge current characteristics with respect to a second charge capacity to determine whether an electromagnetic inductive element is approached. delete The touch type liquid crystal display device according to claim 1, wherein the electromagnetic induction element generates a magnetic field having a predetermined distribution. The touch type liquid crystal display of claim 1, wherein one discharge current output unit is provided for each pixel. The touch type liquid crystal display of claim 1, wherein one discharge current output unit is provided for at least two pixels. delete The method of claim 1, wherein the discharge current output unit is a switching device that operates during the discharge of the pixel capacitance of the pixel to which it belongs to receive the discharge current from the gate line to output to the discharge current analysis unit through the discharge current transfer line. Touch type liquid crystal display device. delete delete delete delete delete delete delete

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