KR20140087481A - Liquid crystal display device having in cell type touch sensing function - Google Patents

Abstract

The present invention provides a liquid crystal display device having an in-cell type touch sensing function, which includes: a liquid crystal panel including a first substrate in which a display area and a non-display area at a periphery of the display area are defined, a second substrate facing the first substrate, and a liquid crystal layer between the two substrates and including a common electrode and a pixel electrode on the inner surface of the first substrate while an insulation layer is interposed between the common electrode and the pixel electrode, wherein the common electrode includes a first common electrode blocked in correspondence to the display area to be separated into a plurality of parts and connected in a first direction, and a second common electrode having a structure separated both in the first direction and a second direction perpendicular to the first direction and the first and second common electrodes are alternately formed in the second direction; a plurality of first channel wires formed in the non-display area of the first substrate and connected to the first common electrode; a plurality of second channel wires connected to the second common electrode; a resistance unit connected to the first and second channel wires and including indium-tin-oxide (ITO); and a touch sensing circuit connected to the first and second channel wires, wherein all the second common electrodes located on the same line in the second direction are connected to the same second channel wire.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display (LCD)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly to an in-cell type touch-sensitive liquid crystal display device capable of suppressing a block dim phenomenon and improving display quality during initial driving.

Recently, liquid crystal display devices have been attracting attention as next generation advanced display devices with low power consumption, good portability, and high value-added.

In general, a liquid crystal display device is driven by using optical anisotropy and polarization properties of a liquid crystal. Since the liquid crystal has a long structure, it has a directionality in the arrangement of molecules, and the direction of the molecular arrangement can be controlled by artificially applying an electric field to the liquid crystal.

Therefore, when the molecular alignment direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the direction of the liquid crystal alignment by optical anisotropy, so that image information can be expressed.

At present, an active matrix liquid crystal display (AM-LCD: hereinafter referred to as liquid crystal display) in which a thin film transistor and pixel electrodes connected to the thin film transistor are arranged in a matrix manner has excellent resolution and video realization capability, It is attracting attention.

The liquid crystal display device includes a color filter substrate on which a common electrode is formed, an array substrate on which pixel electrodes are formed, and a liquid crystal interposed between the two substrates. In such a liquid crystal display device, The liquid crystal is driven to have excellent properties such as transmittance and aperture ratio.

A liquid crystal display device having such a configuration is applied to various products such as a TV, a projector, a mobile phone, and a PDA.

In recent years, a touch screen capable of directly inputting information into a pixel area in which an image is displayed by a user using a finger or the like has been applied instead of a mouse or a keyboard, which is most commonly applied as an input device of a display device.

These touch screens are widely applied to navigation, industrial terminals, notebook computers, financial automation devices, personal mobile phones and tablet PCs, due to their ease of operation.

On the other hand, in applying a touch screen having a touch sensor to a liquid crystal display device, an on-cell type in which a separate touch panel is disposed on a liquid crystal panel has been mainly made. In recent years, however, Development has been progressed so that a touch screen is incorporated in a liquid crystal panel so as to reduce a volume thereof. A liquid crystal display device of a capacitive cell touch type utilizing a common electrode formed on an array substrate including a thin film transistor array as a sensing electrode .

1 is a schematic cross-sectional view of a portion of a display area of a liquid crystal display device in which a conventional touch screen is embedded as an in-cell type.

A conventional liquid crystal display device 1 having a touch screen includes a lower substrate 10 and an upper substrate 50 and a liquid crystal layer 90 interposed between the two substrates 10 and 50 do.

A plurality of pixels P are defined for driving the liquid crystal layer 90 and detecting touch of a user. The pixel electrode 20 is formed in each pixel P have.

The upper substrate 50 is provided with a black matrix 52 at the boundary of each of the plurality of pixels P on the inner surface thereof and sequentially repeats the pixel P surrounded by the black matrix 52 And a color filter layer 54 composed of red, green and blue color filter patterns (R, G, and B) that covers the black mattress 52 and the color filter layer 54, (Not shown).

Each of the pixels P is defined as a region (or an area surrounded by the black matrix 52) captured by gate wiring (not shown) and data wiring (not shown) intersecting with each other, A thin film transistor (TFT) (not shown), which is connected to the gate wiring (not shown) and the data wiring (not shown) and is a switching element,

Each of the pixels P of the lower substrate 10 is connected to the thin film transistor (not shown) and the pixel electrode 20 is formed. An insulating layer 25 is formed corresponding to the pixel electrode 20, The common electrode 30 is provided. At this time, although the common electrode is shown as being formed on the entire surface of the lower substrate in the drawing, it is divided into a plurality of blocks in a substantially display area.

In the conventional liquid crystal display device 1 having the above-described configuration, a common voltage is supplied to the common electrode 30 to display an image during a display period in which an image is displayed, and a non- In the display period, the common electrode 30 is used as an electrode for touch detection by the user.

When the user touches the display area with a finger, a touch capacitance is formed between the upper substrate 50 and the common electrode 30 or between the common electrode 30 formed separately. In this case, The touch position of the user can be detected by comparing the touch capacitance with the reference capacitance, and the operation according to the detected touch position is performed.

2 is a schematic plan view of a lower substrate of a liquid crystal display device in which a conventional touch screen is embedded as an insulator type.

As shown in the drawing, the common electrode 30 is formed in the display area DA by dividing a few pixels (not shown) adjacent in the vertical and horizontal directions into one block. At this time, the common electrode 30 separated and formed in the display area DA is composed of the row common electrode 30a and the column common electrode 30b.

At this time, the column common electrodes 30b are continuously connected in the display area DA in a longitudinal direction and are spaced apart from each other by a predetermined distance, and the row common electrodes 30a are separated from the column common electrodes 30b And is internally connected by the auxiliary wiring 40 in the lateral direction.

On the other hand, in the in-cell touch-type liquid crystal display device 1, the common voltage Vcom is supplied through the row and column common electrodes 30a and 30b patterned for each block. At this time, in order to perform the touch detection of the user's finger or stylus for realizing the touch function, coordinate detection of the X axis and the Y axis within the display area DA must be performed. Therefore, coordinate detection of the X axis and Y axis The common electrode 30 is not formed on the entire surface of the substrate but connected in the longitudinal direction and the column common electrode 30b is connected in the lateral direction via the auxiliary wiring 40 and the row common electrode 30a is formed will be.

The first and second channel wirings CHL1 and CHL2 are connected to the row and column common electrodes 30a and 30b and the first and second channel wirings CHL1 and CHL2 are formed in the non- And a touch sensing circuit 47. The non-display area NA is further provided with a driving circuit part 45 for realizing an image of the display area DA.

The conventional touch in cell type liquid crystal display device 1 having such a configuration applies a common voltage for image display in a state of being separated by the row and column common electrodes 30a and 30b.

In this case, a common voltage of the same magnitude is applied to the row common electrode 30a and the column common electrode 30b in the power applying unit (not shown) provided in the driving circuit unit 45, but the area of the two electrodes 30a and 30b Due to the difference in the initial charge amount due to the difference in the peripheral area (environment such as the type and number of the constituent elements (gate wiring, data wiring, auxiliary wiring, pixel electrode, etc.) overlapping with the common electrode 30) DA, a difference in the magnitude of the common voltage Vcom initially applied occurs. As a result, FIG. 3 (a diagram showing that the conventional LCD device with a built-in touch screen has a block dim smear phenomenon at the time of initial operation) As shown in the figure, when a liquid crystal display device is initially driven, a block dim uneven phenomenon in which a vertical line or a horizontal line pattern is displayed is generated.

This block-uneven smearing phenomenon is alleviated by continuing the driving of the liquid crystal display device for a predetermined period of time. However, since the period until the liquid crystal display device is stabilized, that is, during the initial driving of the liquid crystal display device, Type liquid crystal display device.

In addition, the above-mentioned block dim smear phenomenon occurs not only at the time of initial driving of the liquid crystal display device but also at the time of sudden power-off (OFF) in a state of being stabilized and driven, thereby lowering the stable display quality state of the touch- It is true.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a liquid crystal display device capable of suppressing a dim- An object of the present invention is to provide an in-cell type touch-sensitive liquid crystal display device.

According to an aspect of the present invention, there is provided an in-cell type touch-sensing liquid crystal display device including a first substrate having a display area and a non-display area defined therearound, a second substrate facing the first substrate, A common electrode and a pixel electrode are provided on an inner surface of the first substrate via an insulating layer, the common electrode is divided into a plurality of blocks in correspondence with the display region, And a second common electrode having a structure in which the first common electrode and the second common electrode are separated from each other in the first direction and the second direction perpendicular to the first direction, The liquid crystal panel comprising: a liquid crystal panel; A plurality of first channel wirings formed in the non-display region of the first substrate and connected to the first common electrode; a plurality of second channel wirings connected to the second common electrode; Resistance means connected to each of the first and second channel wirings and made of indium-tin-oxide (ITO); And a touch sensing circuit portion connected to the first and second channel wirings, wherein the second common electrodes located on the same line in the second direction are all connected to the same one second channel wiring.

At this time, a plurality of auxiliary wirings are further provided in the non-display region of the first substrate, and each of the auxiliary wirings connects the touch sensing circuit portion to the first and second channel wirings.

The liquid crystal panel is provided with a driving circuit, and a plurality of muxes are provided in a non-display area of the first substrate. The muxes are connected to the first and second channel wirings, And a common auxiliary wiring to which a common voltage is applied.

In addition, the liquid crystal panel may include a driving circuit portion having a plurality of muxes therein, and each of the muxes may receive a common voltage through each of the first and second channel wirings and the driving circuit portion To the common auxiliary wiring.

And the resistor means has an internal resistance of 1 to 50 MΩ and the width and length thereof can be adjusted as the internal resistance varies in size, the resistor means having a width of 1 to 10 μm and a length of 10 to 900 mm .

In accordance with another aspect of the present invention, there is provided an in-cell type touch-sensitive liquid crystal display device including a first substrate having a display area and a non-display area defined therearound, a second substrate facing the first substrate, and a liquid crystal layer And a common electrode and a pixel electrode are provided on an inner surface of the first substrate via an insulating layer, the common electrode is divided into a plurality of blocks in correspondence with the display region, And a second common electrode having a structure in which electrodes are separated from each other in the first direction and the second direction perpendicular to the first direction, and the first and second common electrodes alternate in the second direction A liquid crystal panel; A plurality of second channel wirings formed in the non-display region of the first substrate and connected to the first common electrode and a plurality of second channel wirings connected to the second common electrode; A driving circuit unit provided in the liquid crystal panel and including a plurality of resistance means therein; And a touch sensing circuit unit provided on the liquid crystal panel and connected to the first and second channel wirings, wherein the second common electrodes located on the same line in the second direction are all connected to the same one second channel wiring And the plurality of first and second channel wirings are connected to the respective resistance means in the driving circuit portion.

At this time, the first and second channel wirings and the touch sensing circuit part are connected to each other through an auxiliary wiring, and the resistance units are connected to the auxiliary wirings.

The driving circuit unit includes a switching unit therein. The switching unit is provided with a plurality of muxes, and the muxes are connected to the common voltage Vcc through the respective first and second channels and the driving circuit unit, And the resistance means has an internal resistance of 1 to 50 M OMEGA.

The first common electrode, the first channel wiring, the second common electrode, and the second channel wiring are connected to each other via a connection wiring, and the other end of the resistor unit is connected to be.

A gate line and a data line crossing each other and defining a pixel; and a thin film transistor connected to the gate line and the data line, the thin-film transistor being provided in the pixel, Is formed in the pixel to be connected to one electrode of the thin film transistor, and the common electrode has a plurality of bar-shaped openings corresponding to the pixels.

A color filter layer is formed on the inner surface of the second substrate.

Type touch sensing liquid crystal display device according to the present invention is characterized in that a high resistance pattern is implemented in a non-display region or a chip type driving circuit portion and is connected to one end of a channel wiring connected to a separated common electrode, When the voltage is applied, the size difference between the initial capacitance due to the ambient environment of the row and column common electrodes and the difference in the area between the row and column common electrodes is negligible, and the row common electrode and the column common electrode have the same potential, It is possible to prevent the occurrence of a block dymbal phenomenon caused by the difference in common electrode applied for each area and position of the column common electrode.

Furthermore, it is possible to suppress the occurrence of a block dim phenomenon caused by a sudden power unfavorable in a state in which the liquid crystal display device is stably driven.

In addition, there is an effect that the display quality of the insensitive type touch-sensitive liquid crystal display device is improved by preventing the occurrence of the block dim spots at the time of initial driving and sudden power unavailability.

Further, in the case where the high resistance pattern is formed in the driver circuit portion, the present invention does not need to include a separate additional external circuit, thereby reducing the increase in the area of the non-display region or the increase in the area of the FPC mounting the external circuit.

1 is a schematic cross-sectional view of a portion of a display area of a liquid crystal display device in which a conventional touch screen is embedded as an in-cell type.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a touch screen.
FIG. 3 is a diagram illustrating a case where a conventional LCD with a built-in touch screen generates a block-dipping phenomenon during initial operation.
FIG. 4 is a cross-sectional view illustrating an in-cell type touch-sensing liquid crystal display device according to a first embodiment of the present invention. FIG. 4 is a cross- A simplified top view.
Fig. 5 is an enlarged view of the area A in Fig. 4; Fig.
FIG. 6 is a cross-sectional view illustrating an in-cell type touch-sensing liquid crystal display according to a modification of the first embodiment of the present invention. FIG. 6 is a cross- FIG. 6 is a plan view schematically showing only a pattern. FIG.
FIG. 7 is a cross-sectional view illustrating another example of an in-cell type touch-sensing liquid crystal display according to a first embodiment of the present invention. FIG. 7 is a cross- A plan view schematically showing only the resistance means
FIG. 8 is a schematic plan view of a lower substrate of an in-cell type touch-sensing liquid crystal display according to a second embodiment of the present invention; FIG.
Fig. 9 is an enlarged view of a region B in Fig. 8; Fig.

Hereinafter, preferred embodiments according to the present invention will be described with reference to the drawings.

First, a common configuration of the in-line type touch-sensitive liquid crystal display according to the first and second embodiments of the present invention will be described.

FIG. 4 is a cross-sectional view illustrating a touch panel according to a first embodiment of the present invention. Referring to FIG. 4, FIG. 5 is an enlarged view of a region A in FIG. 4, and FIG. 6 is a cross-sectional view of a touch panel according to a modification of the first embodiment of the present invention, 7 is a plan view schematically illustrating only the first and second channel lines and the resistance means connected to the common electrode and the insulator type touch sensing liquid crystal display device according to still another modification of the first embodiment of the present invention. FIG. 8 is a plan view schematically showing only a common electrode provided in a display region of a lower substrate of a liquid crystal panel and first and second channel wiring and resistance means connected to the common electrode, 9 is an enlarged view of a region B in Fig. 8, and the same constituent elements as those of the first embodiment are denoted by the same reference numerals .

Referring to FIGS. 4, 5, 6, 7, 8 and 9, the first embodiment of the present invention, the modification example thereof, and the second embodiment of the present invention have a structure of a fringe field switching mode A liquid crystal panel (not shown) of an in-cell touch type having a built-in touch screen for detecting the position of a portion to be touched by a user using a finger or the like, a back light unit (backlight unit) for supplying light to the liquid crystal panel (Not shown), a touch sensing circuit unit 147, and a driving circuit unit 145. [

The driving circuit unit 145 includes a timing controller (not shown), a data driving circuit (not shown), a gate driving circuit (not shown), a backlight driving unit (not shown) and a power supply unit (not shown).

At this time, the driving circuit unit 145 may be formed in a non-display area (NA) of the lower substrate 110 of the liquid crystal panel in whole or in part by a COG (Chip On Glass) or COF (Chip On Flexible Printed Circuit) As shown in FIG.

The liquid crystal panel (not shown) includes a lower substrate 110 and an upper substrate (not shown) and a liquid crystal layer (not shown) interposed between the two substrates 110 P are arranged in a matrix form.

A liquid crystal panel (not shown) having such a configuration displays a desired image through the display area DA by controlling the transmittance of light transmitted through a liquid crystal layer (not shown) of each pixel P according to a data voltage.

Type touch sensing liquid crystal display according to the first embodiment of the present invention and its modified examples and the second preferred embodiment of the present invention can be applied to a touch sensing type liquid crystal display device in which a common electrode 130 formed in a display area DA of the lower substrate 110 is touched by a user (Not shown) when the liquid crystal panel (not shown) is driven, and the initial capacitance difference due to the difference in the environment between the common electrode 130 and the surrounding components It is characterized by having a means capable of suppressing the occurrence of dim block spots.

The display area DA is provided with a plurality of common electrodes 130 separated from each other by a single touch block capable of touch recognition of several pixels P which are adjacent to each other in the vertical and horizontal directions.

At this time, the common electrode 130 separated in a block form has a row common electrode 130a having a shape separated in the horizontal and vertical directions and connected in the horizontal direction and a row common electrode 130a connected in the vertical direction, And the column common electrode 130b is a separated type.

A black matrix (not shown) is provided on the inner surface of the upper substrate (not shown) at the boundary between the pixels P, Each pixel P surrounded by a black matrix (not shown) is provided with a color filter layer (not shown) made up of red, green and blue color filter patterns (not shown) which are sequentially and repeatedly formed. And an overcoat layer (not shown) covering the color filter layer (not shown) and having a flat surface.

The lower substrate 110 may include a plurality of touch sensor functional elements for driving the liquid crystal layer (not shown) and detecting a touch position by using a capacitance generated by a user's touch do.

The lower substrate 110 is provided with a display area DA and a non-display area NA around the display area DA, and the display area DA is perpendicular to the display area DA A gate line GL and a data line DL are formed orthogonal to each other and many pixels P defined as regions surrounded by the gate and data lines GL and DL are provided.

In each pixel P, a thin film transistor Tr connected to the gate line GL and the data line DL is provided as a switching element. In each pixel P, the thin film transistor The pixel electrode 170 is connected to the drain common electrode of the row common electrode 130a and the column common electrode 130b through an insulating layer (not shown) And a common electrode 130 having a shape separated from the common electrode 130.

In this case, the common electrode 130 further includes a plurality of bar-shaped openings (not shown) for each pixel P in each block.

Accordingly, the in-cell type touch-sensing liquid crystal display according to the first and second embodiments of the present invention includes a pixel electrode 170 and a plurality of openings (not shown) spaced apart from each other with an insulating layer (Not shown) in which the movement of the liquid crystal molecules in the liquid crystal layer (not shown) is controlled by a fringe field generated by the common electrode 130 having the common electrode 130.

The thin film transistors Tr included in each pixel P are sequentially stacked in a stacked manner to form a gate electrode (not shown) connected to the gate line GL, a gate insulating film (not shown), a semiconductor layer And source electrodes (not shown) and drain electrodes (not shown) spaced apart from each other.

In this case, the semiconductor layer (not shown) may be formed of an oxide semiconductor material to form a single layer structure, or may be formed of an active layer (not shown) of pure amorphous silicon and impurity amorphous silicon, The ohmic contact layer (not shown) may be formed.

The pixel electrode 170 is electrically connected to a source electrode (not shown) of the thin film transistor Tr through a contact hole (not shown) provided in a protective layer (not shown) And serves to supply the pixel voltage.

The upper substrate (not shown) and the lower substrate 110 having the same configuration are bonded together through a sealant through a liquid crystal layer (not shown), thereby forming a liquid crystal panel (not shown).

The most significant feature of the in-cell type touch-sensitive liquid crystal display device according to the first and second embodiments of the present invention having such a configuration is that the non-display area NA provided outside the display area DA is divided And is connected to one or both ends of a plurality of first and second channel wirings CHL1 and CHL2 electrically connected to the common electrode 130 and has a thickness of several megaohms to several tens of megaohms, More precisely, the resistance means 190 and 290 having a high resistance of about 1 to 50 M ?.

Hereinafter, the first embodiment of the present invention, the modifications thereof, and the characteristic configurations of the second embodiment will be described in more detail.

≪ Embodiment 1 >

4 and 5, in the in-cell type touch-sensitive liquid crystal display device according to the first embodiment of the present invention, the lower substrate 110 displays an image and displays a display area DA in which the user touches, And a non-display area NA located on the outer side thereof.

At this time, the display area DA includes a plurality of pixels P, and a plurality of vertically adjacent pixels P are grouped into a display area DA composed of the plurality of pixels P And the common electrode 130 is formed in a shape corresponding to each block formed by grouping the plurality of pixels P into one group.

This common electrode 130 is comprised of a row common electrode 130a and a column common electrode 130b. The row common electrode 130a is formed in the display region DA in both the longitudinal direction and the lateral direction And the column common electrode 130b is formed to be connected to the row common electrode 130a in the horizontal direction without being spaced apart from each other in the longitudinal direction within the display region DA .

At this time, the row common electrodes 130a are electrically separated in the longitudinal direction, but all of the row common electrodes 130a located on the same line in the lateral direction are connected to the same one via the first connection wiring 140a And is electrically connected to the first channel interconnection line CHL1.

More specifically, the row common electrode 130a and the column common electrode 130b are electrically connected to the non-display area NA outside the display area DA, more precisely at the lower end of the display area DA, And a plurality of first channel wirings CHL1 and a second channel wirings CHL2 are provided.

The plurality of first channel wirings CHL1 are connected to the row common electrode 130a through a first connection wirings 140a and the plurality of second channel wirings CHL2 are connected to the column common electrodes 130a, And are connected to each other via a second connection wiring 130b and a second connection wiring 140b.

Meanwhile, the second connection wiring 140b may be omitted. In this case, the second channel wiring CHL2 may be directly connected to each of the column common electrodes 130b.

Each of the plurality of first channel wirings CHL1 is connected to the row common electrode 130a arranged in the same line in the horizontal direction corresponding to the entire display area DA, And is formed to have a substantially constant length corresponding to the thickness of the substrate.

When the column common electrode and the second connection wiring are connected to each other, the column common electrode 130b connected to the second common electrode and the second common electrode is connected to the second channel wiring CHL2. In this case, the plurality of second channel wirings CHL2 have different lengths depending on the positions of the column common electrodes 130b connected to the second channel wirings CHL2.

On the other hand, the row common electrode 130a located on the same line in the horizontal direction is connected to the same first channel line CHL1 of any one of the plurality of first channel lines CHL1.

In the most specific configuration of the in-cell type touch-sensitive liquid crystal display device according to the first embodiment of the present invention, at least one of non-display areas NA on the left or right of the display area DA The pixel electrode 170 or the common electrode 130 provided in the display region DA is formed in the same region of the common electrode 130 connected to the first and second channel wirings CHL1 and CHL2, A plurality of resistance means 190 (each of which is made of indium-tin-oxide (ITO) which is a conductive material and has a high resistance of about several megaohms (MΩ) (In the figure, the resistance means is indicated by a symbol indicating resistance).

The internal resistance of the resistor 190 has a variable value of several megaohms or tens of megaohms according to the model size of the touch-sensitive type liquid crystal display device and the area size of the display area, The size, area, length, and thickness of the components (for example, data lines, gate lines, pixel electrodes, and thin film transistors) overlapping or adjacent to the common electrode 130 in the region DA can be varied Because.

At this time, in the drawing, the resistance means 190 is formed in the left non-display area NA of the left and right non-display areas NA of the display area DA, and the first and second channel wirings CHL1, CHL2), it is also possible to connect the first and second channel wirings (CHL1, CHL2) formed on the right non-display region (NA) or to the left and right non-display regions (NA) and connected to the first and second channel wirings (CHL1, CHL2).

The resistance means 190 made of indium-tin-oxide (ITO) have the same shape and are spaced apart from each other by a certain distance and each have an internal resistance of several megaohms or tens of megaohms, The width and length of each of them can be appropriately adjusted in order to realize a high resistance of about 50 M?

That is, if the resistance of the resistor 190 can be made to be several megaohms or tens of megaohms, its width and length can be formed in the non-display area NA of the liquid crystal display device Can be freely changed in the range.

For example, the width of the resistor 190 may be several micrometers (1 to 9 micrometers), and the length of the resistor 190 may be several tens to several hundreds of millimeters (10 mm to 900 mm), depending on the area of the liquid crystal display .

One end of the resistor 190 having such a configuration is connected to each of the first and second channel wirings CHL1 and CHL2, and the other ends thereof are connected to each other.

The portions of the first and second channel wirings CHL1 and CHL2 connected to one end of the plurality of resistance means 190 are electrically connected to a plurality of auxiliary wirings 193, and the plurality of auxiliary wirings 193 are connected to the touch sensing circuit unit 147.

Each of the auxiliary wirings 193 connected to the touch sensing circuit part 147 is connected to a common power supply part Vcom provided in the driving circuit part 145 to form a common auxiliary wiring 197 for applying a common voltage, And is connected through a Nux 195 as an example of a switching element.

The common auxiliary wiring 197 and the auxiliary wiring 193 are connected to each other through the respective muxes 195 so that the common auxiliary wiring 197 and the auxiliary wiring 193 are switched by the role of the mux 195, .

That is, each of the auxiliary wirings 193 connected to the first and second channel wirings CHL1 and CHL2 is connected to the common auxiliary wiring 197 through the switching unit SA via the mux 195, The common electrode 130 formed as a block in the display area DA may display an image by supplying a common voltage during a display period for displaying an image and may display an image during a non- And to apply an optional signal voltage to be used as a touch electrode for detection.

In the drawing, the mux 195 is provided in the non-display area NA on the lower substrate 110 of the liquid crystal display device. Accordingly, The common auxiliary wiring 197 connected to the common power source Vcom and the auxiliary wiring 193 are connected to each other through the mux 195 on the lower substrate 110.

However, the mux 195 may be provided on the lower substrate 110, but may be provided in the driving circuit 145 as shown in FIG.

In this modification, the auxiliary wiring 193 passes through the inside of the driving circuit portion 145 and is connected to the common auxiliary wiring 197 through a mux 195 as an intermediary in the driving circuit portion 145 And one end of the auxiliary wiring 193 extends to the outside of the driving circuit portion 145 to be connected to the touch sensing circuit portion 147.

In the first embodiment of the present invention having such a configuration and a modification thereof, the lower substrate 110 of the in-cell type touch-sensitive liquid crystal display device includes the auxiliary (not shown) provided in the non-display area NA of the lower substrate 110, When a touch signal is applied to each of the first and second channel wirings CHL1 and CHL2 or a common voltage is selectively applied through the common wiring 196 and the touch sensing circuit 147, The touch signal or the common voltage is applied to the row and column common electrodes 130a and 130b having the shape separated by blocks through the second channel wirings CHL1 and CHL2.

Each of the first and second channel wirings CHL1 and CHL2 is connected to the resistance unit 190 having a high resistance of several megaohms or several tens of megaohms so that the first and second channel wirings CHL1 and CHL2 are separated from each other When the touch signal or the common voltage Vcom is applied to the common electrode 130, the surrounding environment of the row and column common electrodes 130a and 130b separated by the large internal resistance of the resistor unit 190, The difference in magnitude of the initial capacitance due to the difference in the self-area is negligibly small.

Since the first and second channel wirings CHL1 and CHL2 are connected to the resistor unit 190, the first and second channel wirings CHL1 and CHL2 and the row and column common electrodes 130a, and 130b are equipotential as a whole.

Therefore, even if the common voltage Vcom is applied to the row and column common electrodes 130a and 130b separated and separated through the first and second channel wirings CHL1 and CHL2 during the initial operation of the liquid crystal display device, The column common electrodes 130a and 130b are equipotential without being affected by the difference in the ambient environment so that the block height unevenness due to the difference in luminance between the row common electrode 130a and the column common electrode 130b does not occur.

Type touch-sensing liquid crystal display device according to the first embodiment of the present invention having such a configuration, the row common electrode 130a and the column common electrode 130b formed separately and formed in the display area DA are divided into one frame A common voltage Vom is supplied through the resistor unit 190 and the first and second channel wirings CHL1 and CHL2 connected to the resistor unit 190 in a display period in which an image is displayed during the period, The row and column common electrodes 130a and 130b blocked during the non-display period in which no image is displayed, that is, the touch sensing period, serve as touch electrodes for touch detection of the user's fingers or the like, .

The touch sensing circuit unit 147 senses a change in capacitance due to a user's touch and detects a touch position of the user.

7, the driving circuit unit 145 and the touch sensing circuit unit 147 are provided on the upper side of the display area DA. However, as shown in FIG. 7, The touch sensing circuit part 147 may be located in the non-display area NA on the lower side of the display area DA. In this case, each of the first channel wiring CHL1 and the second channel wiring CHL2, (193 in FIG. 4).

In this case, the second channel wiring CHL2 is directly connected to the column common electrode 130b and can be connected to the touch sensing circuit unit 147 without the second connection wiring 140b (FIG. 4).

Although not shown in the drawing, the driving circuit (not shown) configured in the non-display area (NA) of the lower substrate 110 of the in-cell type touch-sensing liquid crystal display according to the first embodiment of the present invention and the modified example thereof having the above- A power supply unit (not shown) including a timing control unit (not shown), a data driving circuit unit (not shown), a gate driving circuit unit (not shown), and a common power supply unit is further formed.

The timing controller (not shown) aligns video signals from the outside, converts the video signals into frame-based digital video data, and supplies the digital video data aligned on a frame-by-frame basis to the data driving circuit.

Then, a gate control signal for controlling the gate driving circuit and a data control signal for controlling the data driving circuit are generated by using the inputted vertical synchronizing signal, horizontal synchronizing signal and clock signal. The generated gate control signal is supplied to a gate driving circuit (not shown), and the data control signal DCS is supplied to the data driving circuit (not shown).

At this time, the data control signal includes a source start pulse, a source sampling clock, a source output enable, and a polarity control signal.

The gate control signal GCS includes the gate start pulse, the gate shift clock, and the gate output enable signal.

The timing controller (not shown) generates a timing synchronization signal indicating a display period for displaying an image during one frame period and a non-display period for not displaying an image, that is, a touch sensing period, To a power supply unit (not shown).

The gate driving circuit unit (not shown) includes a scan signal for driving the thin film transistor Tr formed in each of the plurality of pixels P based on a gate control signal (not shown) from the timing controller thereby generating a scan signal.

At this time, the generated scan signal is sequentially supplied to a plurality of gate lines GL formed in a liquid crystal panel (not shown) during one frame period, and the thin film transistor Tr formed in each pixel P by the scan signal, The switching of each pixel P is performed.

In addition, the data driving circuit unit (not shown) converts digital image data supplied from the timing controller (not shown) into an analog image data signal, that is, a data voltage.

Then, based on the data control signal from the timing controller (not shown), analog data converted in accordance with the time when the thin film transistor Tr of each pixel P is turned on And supplies a signal to a plurality of data lines DL formed in a liquid crystal panel (not shown).

The touch sensing circuit part 147 includes first and second channel wirings CHL1 and CHL2 connected to the row and column common electrodes 130b separated from the display area DA and an auxiliary wiring 193 Detects the touch position of the user and outputs information about the detected touch position to the outside.

≪ Embodiment 2 >

8 and 9, the constitution of the in-line type touch-sensitive liquid crystal display device according to the second embodiment of the present invention will be described. At this time, in the in-cell type touch-sensing liquid crystal display device according to the second embodiment of the present invention, the configuration in the display area DA is the same as that in the first embodiment described above, and therefore, description thereof will be omitted.

As shown in the figure, in an insensitive-type touch-sensitive liquid crystal display device according to the second embodiment of the present invention, a distinguishing feature different from the constitution of the insensitive-type touch-sensitive liquid crystal display device according to the first embodiment is a The resistance means 290 having a resistance is provided in the driving circuit portion 145 such as a gate driving circuit portion (not shown) or a data driving circuit portion (not shown) without being provided in the non-display area NA of the lower substrate 110 .

A non-display area NA outside the display area DA formed in the lower substrate 110 is provided with row and column common electrodes separately provided in the display area DA, A plurality of first and second channel wirings CHL1 and CHL2 connected to the first and second channel wirings 130a and 130b.

The auxiliary wiring 193 is connected to one end of each of the first and second channel wirings CHL1 and CHL2 and the auxiliary wiring 193 passes through the driving circuit 147 The other end of which is connected to a touch sensing circuit part 147 separately provided outside the driving circuit part 145. The other end of the sensing circuit part 145 is connected to a resistance sensing part 290 having a high resistance of about 1 to 50 MΩ provided in the driving circuit part 145, .

At this time, as the most characteristic configuration of the in-cell type touch-sensing liquid crystal display device according to the second embodiment of the present invention, the first and second channel wirings CHL1 and CHL2 and the auxiliary wiring 193, The resistor unit 290 includes a driving circuit unit 145 mounted in a liquid crystal panel (not shown) with a liquid crystal panel (not shown) itself or an FPC (not shown) or a film More precisely, in a data driving circuit portion (not shown) or a gate driving circuit portion (not shown).

The resistor unit 290 provided in the driving circuit unit 145 and connected to the respective auxiliary wires 193 is also connected at one end to the auxiliary wiring 193 and at the other ends to each other Feature.

In this case, the auxiliary wiring 193 connected to the resistor unit 290 provided in the driving circuit unit 145 is connected to the switching unit SD in the driving circuit unit 145, And a common auxiliary wiring 197 for applying a common voltage to the touch sensing circuit part 147 and the Mux part 195. The other end of the touch sensing circuit part 147 is formed separately from the driving circuit part 145, It is connected.

The auxiliary wiring 193 connected to the resistor unit 190 is connected to the common auxiliary wiring 197 via a mux 195 provided in the switching unit SD. The common electrode 130 formed as a block in the data line DA is used as a touch electrode for touch detection of a user in a non-display period in which an image is displayed by supplying a common voltage during a display period for displaying an image So as to execute a switching function for applying a selective signal to the signal.

The resistor unit 190 provided in the driving circuit unit 145 is electrically connected to the first and second channel wirings CHL1 and CHL2 through the auxiliary wiring 193. However, When the first and second channel wirings CHL1 and CHL2 are formed in the non-display area NA located on the left or right of the display area DA, 290 and the first and second channel wirings CHL1, CHL2 may be directly connected.

In this case, the first and second channel wirings CHL1 and CHL2 are extended to the driving circuit portion 145 and are muxed for signal switching through the switching portion SA in the driving circuit portion 145. [ (Not shown) for generating a common voltage to be provided to the driving circuit unit 145 with the driving circuit unit 195 as a medium, and one end of the common auxiliary wiring 197 is further extended, And a touch sensing circuit unit 147 provided outside the touch sensing circuit unit 145.

In the second embodiment having such a configuration and a modification thereof, the resistance means 290 provided in the driving circuit portion 145 is not limited to the material thereof, unlike the first embodiment.

In other words, if the resistance of the resistor 290 provided in the second embodiment is about 1 to 50 M OMEGA, the resistance of the first resistance element 290 made of indium-tin-oxide (ITO) But it may be formed of any material different from the embodiment.

It should be noted that the resistor 290 must be formed inside the chip because the driver circuit 145 is mounted in a chip form. will be.

One end of each of the first and second channel wirings CHL1 and CHL2 is connected to the touch sensing circuit part 147 through the auxiliary wiring 193 and the first and second channel wirings A voltage for sensing is sequentially applied to the common electrode 130 separated for each block through the switches CHL1 and CHL2 and sensed by the touch sensing circuit 147 so that the touch position of the user is recognized. And output to an external device (not shown).

The resistance means 290 formed in the driving circuit portion 145 such as the gate or the data driving circuit portion (not shown) described above and the auxiliary wiring 193 connecting the first and second channel wirings CHL1 and CHL2 All the components except for the first embodiment have the same configuration as those of the first embodiment described above, and thus their detailed description will be omitted.

Type touch-sensing liquid crystal display device according to the second embodiment of the present invention having such a configuration also includes the row and column common electrodes (" CHL1 " and " CHL2 " Even if a common voltage is applied to the display region DA, the difference in capacitance due to the difference in the area and the surrounding environment in the display region DA due to the resistance means 290 having an internal resistance value of 1 to 50 M OMEGA is very slight And the row and column common electrodes 130a and 130b have the same potential, so that no block-shaped unevenness having a difference in luminance between blocks is generated.

In addition, in the second embodiment of the present invention, since the resistor unit 290 is formed inside the driving circuit unit 145, it is not necessary to provide a separate additional external circuit, so that the area of the non-display area NA is increased, There is an effect of suppressing an increase in the area of an FPC (not shown) to be mounted.

The present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the spirit of the present invention.

110: Lower substrate
130: common electrode
130a: row common electrode
130b: column common electrode
140: Connection wiring
140a, 140b: first and second connection wiring
145:
147: Touch sensing circuit part
190: Resistance means
193: Auxiliary wiring
195: Mux
197: Common auxiliary wiring
CHL1, CHL2: first and second channel wiring
DA: Display area
NA: non-display area

Claims (15)

A liquid crystal layer is provided between a first substrate having a display region and a non-display region defined therebetween, a second substrate facing the second substrate, and a liquid crystal layer between the first substrate and the second substrate, And the common electrode is divided into a plurality of blocks by corresponding to the display region, and the first common electrode and the second common electrode are separated from each other in the first direction and the second direction perpendicular to the first direction. And the first and second common electrodes alternate with each other in the second direction;
A plurality of first channel wirings formed in the non-display region of the first substrate and connected to the first common electrode; a plurality of second channel wirings connected to the second common electrode;
Resistance means connected to each of the first and second channel wirings and made of indium-tin-oxide (ITO);
The touch sensing circuit part connected to the first and second channel wirings
And the second common electrodes located on the same line in the second direction are all connected to the same one second channel wiring.
The method according to claim 1,
Wherein the plurality of auxiliary wirings further include a plurality of auxiliary wirings in the non-display region of the first substrate, and the auxiliary wirings connect the first and second channel wirings to the touch sensing circuit portion.
The method according to claim 1,
The liquid crystal panel is provided with a driving circuit,
A plurality of muxes are provided in a non-display area of the first substrate, and each of the muxes is connected to a common auxiliary wiring to which a common voltage is applied through the first and second channel wirings and the driving circuit Insel type touch recognition liquid crystal display device.
The method according to claim 1,
The liquid crystal panel is provided with a driving circuit portion having a plurality of muxes therein,
Wherein each of the muxes is connected to a common auxiliary line to which a common voltage is applied through the first and second channel wirings and the driving circuit.
The method according to claim 1,
Wherein the resistance means has an internal resistance of 1 to 50 M ?, and the width and the length of the internal resistance are adjusted according to a change in the size of the internal resistance.
6. The method of claim 5,
Wherein the resistance means has a width of 1 to 10 mu m and a length of 10 to 900 mm.
A liquid crystal layer is provided between a first substrate having a display region and a non-display region defined therebetween, a second substrate facing the second substrate, and a liquid crystal layer between the first substrate and the second substrate, And the common electrode is divided into a plurality of blocks by corresponding to the display region, and the first common electrode and the second common electrode are separated from each other in the first direction and the second direction perpendicular to the first direction. And the first and second common electrodes alternate with each other in the second direction;
A plurality of second channel wirings formed in the non-display region of the first substrate and connected to the first common electrode and a plurality of second channel wirings connected to the second common electrode;
A driving circuit unit provided in the liquid crystal panel and including a plurality of resistance means therein;
And a touch sensing circuit unit provided in the liquid crystal panel and connected to the first and second channel wirings,
Wherein the second common electrode located on the same line in the second direction is connected to the same one of the second channel wirings, and each of the plurality of first and second channel wirings includes the angle Type touch-sensing liquid crystal display device connected to the resistance means.
8. The method of claim 7,
Wherein the first and second channel wirings and the touch sensing circuit portion are connected to each other via an auxiliary wiring, and each of the resistance means is connected to each of the auxiliary wirings.
8. The method of claim 7,
Wherein the driving circuit includes a switching unit therein and the switching unit is provided with a plurality of muxes and the muxes have a common voltage through the first and second channels and the driving circuit unit, Type touch-sensing liquid crystal display connected to a common auxiliary wiring to be applied.
8. The method of claim 7,
Wherein the resistance means has an internal resistance of 1 to 50 M ?.
The method according to any one of claims 1, 3, 4, and 7,
Wherein the first common electrode, the first channel wiring, the second common electrode, and the second channel wiring are connected to each other through connection wirings.
The method according to any one of claims 1, 3, 4, and 7,
And the other end of the resistor unit is connected to the touch panel.
The method according to any one of claims 1, 3, 4, and 7,
The display region of the inner side surface of the first substrate
A gate line and a data line crossing each other to define a pixel, and a thin film transistor connected to the gate line and the data line and provided in the pixel, wherein the pixel electrode is connected to one electrode of the thin film transistor in the pixel Type touch sensing liquid crystal display device.
14. The method of claim 13,
Wherein the common electrode has a plurality of bar-shaped openings corresponding to the respective pixels.
15. The method of claim 14,
And a color filter layer is formed on an inner surface of the second substrate.

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