KR101450948B1 - Touch sensor integrated display device - Google Patents

Abstract

A touch sensor integrated type display device according to an embodiment of the present invention includes: a gate line and a data line intersecting each other on a substrate to form a pixel region; a plurality of pixel electrodes formed in the pixel region; A common electrode formed to overlap with the plurality of pixel electrodes and including at least two touch electrodes, and at least one signal line connected to each of the touch electrodes and overlapping the data lines.

Description

TECHNICAL FIELD [0001] The present invention relates to a TOUCH sensor integrated display device,

The present invention relates to a display device, and more particularly, to a touch sensor integrated display device.

The touch sensor includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an electroluminescence device (EL) And the like, and is a type of an input device that presses (presses or touches) the touch panel while the user views the image display device and inputs predetermined information.

The touch sensor used in the above-described display device can be divided into an add-on type, an on-cell type, and an integrated type according to its structure. In the top plate attaching type, a touch sensor is attached to an upper plate of a display device after separately manufacturing a display device and a touch sensor. The top plate integral type is a method of directly forming elements constituting the touch sensor on the surface of the upper glass substrate of the display device. The built-in type has a built-in touch sensor inside the display device to achieve a thin display device and enhance durability.

However, the top-plate-attached touch sensor has a structure in which the completed touch sensor is mounted on the display device and mounted thereon, resulting in a problem that the thickness of the touch sensor becomes thick and the brightness of the display device becomes dark. In addition, although the top plate integrated type touch sensor has a structure in which a separate touch sensor is formed on the top surface of the display device, the thickness of the touch sensor can be reduced compared to that of the top plate attachment type. However, the driving electrode layer and the sensing electrode layer, There is a problem that the total thickness is increased and the number of processes increases and the manufacturing cost increases.

Meanwhile, since the built-in touch sensor has improved durability and thinness, it has an advantage of solving the problems caused by the touch sensor of the top plate attachment type and the top plate integration type. Such a built-in touch sensor includes an optical system and a capacitive system.

The optical touch sensor forms a light sensing layer on a thin film transistor substrate array of a display device and recognizes light reflected through an object existing in a touched portion by using light from a backlight unit or infrared light. However, the optical touch sensor exhibits relatively stable driving performance when the surroundings are dark, but stronger lights than the reflected light act as noise when the surroundings are bright. This is because the intensity of the light reflected by the actual touch is very weak, which may cause an error in touch recognition even if the outside is slightly bright. Particularly, the optical touch sensor has a problem that when the surrounding environment is exposed to sunlight, the light intensity is so strong that the touch recognition may not be performed.

The capacitance type touch sensor has a self capacitance type and a mutual capacitance type. The mutual capacitance type touch sensor divides a common electrode for display into a driving electrode region and a sensing electrode region so that a mutual capacitance is formed between the driving electrode region and the sensing electrode region, It is a method of recognizing the touch by measuring the change amount of capacitance.

However, the mutual capacitance type touch sensor has a very small mutual capacitance generated when the touch recognition is performed, while the parasitic capacitance between the gate line and the data line constituting the display device is very large, There is a problem that is difficult to recognize.

In addition, since the mutual capacitance type touch sensor requires a plurality of touch driving lines for touch driving and a plurality of touch sensing lines for touch sensing on the common electrode for multitouch recognition, a very complicated wiring structure is required .

Accordingly, a need has arisen for a touch sensor integrated type display device capable of solving the problems caused by the above-described types of touch sensors.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a touch sensor integrated type display device in which thickness is reduced and durability is improved by using a touch sensing element for recognizing a touch of a display device, .

It is another object of the present invention to provide a touch sensor integrated type display device in which signal lines for touch recognition are superposed on data lines to improve the aperture ratio.

According to an aspect of the present invention, there is provided a touch sensor integrated type display device including gate lines and data lines intersecting each other on a substrate to form pixel regions, a plurality of pixel electrodes formed on the pixel regions, A common electrode formed to overlap with the plurality of pixel electrodes with an insulating layer interposed therebetween and including at least two touch electrodes and at least one signal line connected to each of the touch electrodes and overlapped with the data line can do.

 According to another aspect of the present invention, there is provided a touch sensor integrated type display device including a gate line formed on a substrate, a gate insulating film formed on a front surface of the substrate on which the gate line is formed, A thin film transistor formed on the gate insulating film and connected to the data line; a thin film transistor formed on the gate insulating film to be connected to a drain electrode of the thin film transistor, An interlayer insulating film formed on the gate insulating film on which the pixel electrode, the data line, the signal line, the thin film transistor, and the pixel electrode are formed, the data line being formed on the interlayer insulating film, A signal line formed to overlap the line, A passivation film formed on the interlayer insulating film on which the signal lines are formed and a common electrode formed on the passivation film and connected to the signal line through a via hole formed in the passivation film, And each of the touch electrodes may be connected to the signal line.

The signal lines may be formed in parallel with the data lines.

The signal line may be located outside the region where the pixel electrode and the common electrode overlap.

Each of the touch electrodes may have a size corresponding to two or more pixel electrodes.

In the touch sensor integrated type display device, the touch driving is turned off at the time of the display driving, and the display driving is turned off at the touch driving time.

The same common voltage may be supplied to the two or more touch electrodes through the signal lines during the display driving, and the touch driving voltage may be sequentially supplied to the touch electrodes during the touch operation.

According to the touch sensor integrated type display device according to the embodiment of the present invention, since the touch sensor for recognizing the touch can be used also as a component of the display device, the thickness of the display device can be reduced and the durability can be improved. Can be obtained.

In addition, according to the touch sensor integrated display device according to the embodiment of the present invention, since it is not necessary to separately configure the touch driving line and the touch sensing line for touch recognition, the number of signal lines can be reduced, Can be recognized.

In addition, according to the touch sensor integrated type display device according to the embodiment of the present invention, the signal line for touch recognition can be superimposed on the data line to improve the aperture ratio.

1 is a schematic view showing a touch sensor integrated type display apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view schematically showing a display panel of the touch sensor integrated type display device shown in FIG. 1. FIG.
3 is a schematic view schematically showing a relationship between a common electrode, a pixel electrode and wirings in a touch sensor integrated type display device according to an embodiment of the present invention.
4 is a schematic view showing an example of the arrangement relationship of a common electrode and a pixel electrode in a touch sensor integrated type display device according to an embodiment of the present invention.
5A is a view showing an example of a connection relationship between a common electrode (touch electrode) and a signal line in a touch sensor integrated type display device according to an embodiment of the present invention, and 5b is an example of a touch sensor integrated type display device according to an embodiment of the present invention. (Touch electrode) of a display device and a signal line. Fig.
FIG. 6A is an enlarged plan view of a part of a touch sensor integrated display device according to an embodiment of the present invention, and FIG. 6B is a sectional view taken along line II 'and II-II' shown in FIG. 6A.
FIG. 7 is a graph illustrating a measurement of transmittance loss for each resolution according to whether data lines and signal lines are overlapped. FIG.
FIG. 8 illustrates 60 Hz time division driving of a touch sensor integrated type display apparatus according to an embodiment of the present invention. FIG.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components.

The touch sensor integrated display device according to the embodiment of the present invention will be described in more detail with reference to FIGS. 1 to 4. FIG. 2 is a perspective view schematically showing a display panel of the touch sensor integrated type display device shown in FIG. 1, and FIG. 3 is a cross-sectional view of a touch sensor integrated type display device according to an embodiment of the present invention. 4 is a schematic view showing a relationship between a common electrode, a pixel electrode, and wirings of a touch sensor integrated display device according to an embodiment of the present invention. Fig. 2 is a schematic view showing an example of arrangement relationship of pixel electrodes.

In the following description, the touch sensor integrated type liquid crystal display device will be specifically described as an example of the touch sensor integrated type display device.

Referring to FIGS. 1 and 2, a touch sensor integrated type liquid crystal display device according to an embodiment of the present invention includes a liquid crystal display panel (LCP), a host controller 100, a timing controller 101, a data driver 102, A driving unit 103, a power supply unit 105, a touch recognition processor 107, and the like.

The liquid crystal display panel (LCP) includes a color filter array (CFA) and a thin film transistor array (TFTA) formed with a liquid crystal layer interposed therebetween.

The thin film transistor array TFTA includes a plurality of gate lines G1, G2, G3, ..., Gm-1, Gm (for example, And data lines D1 and D2 formed in parallel in the second direction (e.g., y direction) so as to intersect with the plurality of gate lines G1, G2, G3, ..., Gm- Dn-1, Dn, D3, ..., Dn-1, Dn and the gate lines G1, G2, G3, A plurality of pixel electrodes P for charging a data voltage to the liquid crystal cells, and a plurality of pixel electrodes P arranged to face the plurality of pixel electrodes P, And an electrode COM.

The color filter array CFA includes a black matrix and a color filter formed on the second substrate SUBS2. Polarizing plates POL1 and POL2 are attached to the upper glass substrate SUBS1 and the lower glass substrate SUBS2 of the liquid crystal display panel LCP and an alignment film for setting the pretilt angle of the liquid crystal is formed on the inner surface in contact with the liquid crystal. A column spacer for maintaining a cell gap of the liquid crystal cell may be formed between the first substrate SUBS1 and the second substrate SUBS2 of the liquid crystal display panel LCP.

The common electrode COM is formed on the first substrate in a vertical electric field driving method such as a TN (Twisted Nematic) mode and VA (Vertical Alignment) mode. The common electrode COM is formed in the IPS (In Plane Switching) mode and the FFS And is formed on the first substrate SUBS1 together with the pixel electrode P in the horizontal field driving method. In the embodiment of the present invention, the horizontal electric field driving method will be described as an example.

The common electrode COM according to the embodiment of the present invention is composed of a plurality of touch electrodes divided so as to have a size corresponding to the size of several or several tens of pixel electrodes. The pixel electrode P is allocated to an area defined by the intersection of the gate lines G1 to Gm and the data lines D1 to Dn. 3 and 4, the common electrodes COM are arranged in a matrix of nine (3) in the horizontal direction and three (3) in the vertical direction, and a total of nine touch electrodes C11, C12, C13, C21, C22, C23, C31, C32, P12, P21, P22; P13, P14, P23, P24; P15, P16, P25, P26; P31, P32 , P41, P42, P33, P34, P43, P44, P35, P36, P45, P46; P51, P52, P61, P62; P53, P54, P63, P64; P55, P56, P65, Size, but this is only an example, and the number can be changed as needed.

The divided touch electrodes C11, C12, C13, C21, C22, C23, C31, C32 and C33 constituting the common electrode COM are connected to the plurality of signal lines TX11, TX12, TX13, TX21, TX22, TX23, TX31, TX32, and TX33, which are connected in a row unit or a column unit, and perform functions as a component for implementing display of a display device and a component function of a touch sensor for touch recognition.

5A is a view showing an example of a connection relationship between a common electrode (touch electrode) and a signal line in a touch sensor integrated type display device according to an embodiment of the present invention, and 5b is an example of a touch sensor integrated type display device according to an embodiment of the present invention. (Touch electrode) of a display device and a signal line.

Referring to FIG. 5A, three touch electrodes C11, C21 and C31 are arranged in a first column, and each of the three touch electrodes includes first through third signal lines TY11, TY12, and TY13, respectively. Three touch electrodes C12, C22 and C32 are arranged in the second column, and each of the three touch electrodes is connected to each of the fourth to sixth signal lines TY21, TY22 and TY23 arranged along the second column Respectively. Three touch electrodes C13, C23, and C33 are arranged in the third column, and each of the three touch electrodes is connected to each of the first to third signal lines TY31, TY32, and TY33 arranged along the third column Respectively. Since each of the touch electrodes arranged in the column direction is connected to one signal line arranged in the column direction in this way, even when the display device is multi-touched, the position where the touch is made can be accurately detected.

Referring to FIG. 5B, three touch electrodes C11, C21, and C31 are arranged in a first column, and each of the three touch electrodes is connected to first to third signal lines TY11 , TY12, and TY13, respectively. However, in the embodiment of FIG. 5B, each of the first to third signal lines TY11, TY12, and TY13 is branched into three, and three branch signal lines constituting each signal line are connected to one touch electrode Which is different from FIG. 5A. The connection relationship between the second row of touch electrodes C12, C22 and C32 and the third to sixth signal lines TY21, TY22 and TY23 and the connection relationship between the third row of touch electrodes C13, C23 and C33 and the third signal line TY31 , TY32, and TY33 are also the same as the connection relationship between the touch electrode of the first row and the first to third signal lines, and thus the description thereof will be omitted.

In the embodiments of FIGS. 5A and 5B described above, the structure of the touch electrode composed of three rows and three columns is described, but the present invention is not limited thereto. For example, the number of touch electrodes and the number of signal lines connected to the touch electrodes can be appropriately adjusted according to needs, such as the size of the touch electrodes. When at least one signal line is connected to each touch electrode and a plurality of signal lines are connected to one touch electrode, the ends of the signal lines are integrated .

FIG. 6A is an enlarged plan view of a part of a touch sensor integrated display device according to an embodiment of the present invention, and FIG. 6B is a cross-sectional view taken along line I-I 'and II-II' shown in FIG. 6A. 6A and 6B are a plan view and a cross-sectional view illustrating, as an example, a region corresponding to the pixel electrodes P11 and P12 among the touch electrodes C11 of the common electrode COM shown in FIG. 3, And is connected to a touch electrode.

6A and 6B, a touch sensor integrated display device according to an embodiment of the present invention includes a gate line G1 formed on a first substrate SUBS1 and a gate electrode G2 extending from a gate line G1 G).

The touch sensor integrated type display device includes a gate insulating film GI formed on a substrate SUBS1 having a gate line G1 having a gate electrode G formed thereon, And a semiconductor pattern (A) formed on the insulating film (GI). The semiconductor pattern A constitutes an active region of a thin film transistor (TFT) to be described later.

The touch sensor integrated type display device further includes data lines D1 and D2 intersecting the gate line G1 with a gate insulating film GI therebetween, a source electrode S extending from the data lines D1 and D2, And a thin film transistor (TFT) including a source electrode (S) and a drain electrode (D) facing the source electrode (S). And pixel electrodes P11 and P12 formed in a region defined by the intersection of the gate line G1 and the data line D1 and connected to the drain electrode of the thin film transistor TFT.

The touch sensor integrated type display device includes an interlayer insulating film INS formed on a front surface of a gate insulating film GI on which data lines D1 and D2, a transistor TFT and pixel electrodes P11 and P12 are formed, And a first signal line TY11 and a second signal line TY12 overlapping the data lines D1 and D2 on the data line INS.

Here, the first signal line TY11 and the second signal line TY12 are arranged and overlapped with the data lines D1 and D2 in parallel. The first signal line TY11 and the second signal line TY12 are formed of a material selected from the group consisting of aluminum (Al), aluminum-neodymium (AlNd), copper (Cu), molybdenum (Mo), molybdenum- ) Or other low-resistance metal or alloy.

Therefore, the first signal line TY11 and the second signal line TY12 are formed so as to be parallel to and overlapped with the data lines D1 and D2, so that the first signal line TY11 and the second signal line TY12 are overlapped with the data lines D1 and D2, There is an advantage that the aperture ratio can be prevented from being reduced by the signal line TY11 and the second signal line TY12.

The touch sensor integrated type display device includes a passivation film PL formed on a front surface of an interlayer insulating film INS in which a first signal line TY11 and a second signal line TY12 are formed and a passivation film PL formed on a passivation film PL And a common electrode (touch electrode) C11. The common electrode (touch electrode) C11 is connected to the second signal line TY12 through the contact hole CH penetrating the passivation film PL.

FIG. 7 is a graph illustrating loss of transmittance by resolution according to whether data lines and signal lines are overlapped. Here, the embodiment is a display device manufactured by superimposing a data line and a signal line as shown in Figs. 6A and 6B described above, and a comparative example shows a display device manufactured so that a data line and a signal line are not overlapped.

Comparing the embodiment of the present invention with the comparative example with reference to FIG. 7, the comparative example showed a transmittance loss of 5.1% at the same resolution of 230 PPI, whereas the embodiment showed a transmittance loss of 0.7%. In addition, the comparative example showed a transmittance loss of 9.0% at the same resolution of 266PPI, whereas the example showed a transmittance loss of 0.5%. Also, at the same resolution of 330 PPI, the comparative example showed a transmittance loss of 17.1%, whereas the example showed a transmittance loss of 4.4%.

That is, the display device according to the embodiment of the present invention, which is manufactured by superimposing the data line and the signal line, has an advantage that the transmittance loss can be remarkably reduced for the display device of the comparative example.

Next, the operation of the touch-sensor-integrated liquid crystal display device according to the embodiment of the present invention will be described. In the following description, an example of 60 Hz time division driving will be described.

The touch sensor-integrated liquid crystal display device according to the embodiment of the present invention is driven by time division. In addition, one cycle of the time division driving is constituted by a display period and a touch period as shown in FIG. 8, and the touch driving is turned off at the time of display and the display driving is turned off at the time of touch, have. For example, in 60 Hz time division driving, 16.7 ms is one cycle, which is divided into a display driving period (about 10 ms) and a touch driving period (about 6.7 ms).

In the display period, the host controller 100 controls the power supply unit 105 so that the signal lines TY11 to TY33 shown in FIG. 5A are applied to the common electrode COM composed of, for example, the touch electrodes C11 to C33 The data driver 102 supplies the common voltage Vcom through the data lines D1 to Dn in synchronization with the gate pulse Gate sequentially outputted from the gate driver 103 To P66) corresponding to the digital video data. Since the electric field is formed in the liquid crystal layer by the common voltage Vcom and the pixel voltage Data applied to the pixel electrodes P11 to P66 and the common electrode COM in this way, Operation is performed. At this time, the touch recognition processor 107 connected to the plurality of touch electrodes C11 to C33 by the respective signal lines TX11 to TX33 measures the voltage value of the initial capacitance of each of the touch electrodes C11 to C33 And stores it.

Next, in the touch driving period, the host controller 100 controls the power supply unit 105 to perform a touch operation of the common electrode COM through the signal lines TY11 to TY33 of FIGS. 5A and 5B, The touch driving voltage Vtsp is sequentially supplied to the electrodes C11 to C33. The touch recognition processor 107 connected to the plurality of touch electrodes C11 to C33 can control the voltages of the initial capacitances of the stored touch electrodes C11 to C33 and the voltages Vd ), And converts the result into digital data. Also, the touch recognition processor 107 determines the touch position where the touch is made based on the difference between the initial capacitance and the touch capacitance using the touch recognition algorithm, and outputs touch coordinate data indicating the touch position.

In the touch-sensor-integrated liquid crystal display device, the display driving is turned off at the time of touch operation, the supply of the signals to the gate line GL and the data line DL is stopped, the touch driving is turned off at the time of the display driving, Is driven by the time-divisional drive which is not supplied.

According to the touch sensor integrated type display device according to the above-described embodiment of the present invention, since the touch sensor for recognizing the touch can also be used as a component of the display device, the thickness of the display device can be reduced and the durability can be improved Effect can be obtained.

In addition, according to the touch sensor integrated display device according to the embodiment of the present invention, since it is not necessary to separately configure the touch driving line and the touch sensing line for touch recognition, the number of signal lines can be reduced, Can be recognized.

In addition, according to the touch sensor integrated type display device according to the embodiment of the present invention, the signal line for touch recognition can be superimposed on the data line to improve the aperture ratio.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. For example, the first direction and the second direction described in the embodiment of the present invention can be changed in directions opposite to each other, and the size and number and shape of the common electrode, the size of the touch electrode constituting the common electrode And the number, shape, and number of signal lines connected to the respective touch electrodes can be appropriately changed, and are not limited to those described in the embodiments 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 invention but should be defined by the claims.

Claims (7)

A gate line and a data line crossing each other on the substrate to form a pixel region;
A plurality of pixel electrodes formed in the pixel region;
A common electrode formed to overlap the plurality of pixel electrodes with an insulating layer interposed therebetween, the common electrode comprising a plurality of touch electrodes; And
And at least one signal line connected to each of the plurality of touch electrodes and overlapping the data line,
At the time of the display driving, the touch driving is turned off, and at the touch driving time, the display driving is turned off,
Wherein the common voltage is supplied to all of the plurality of touch electrodes through the signal line and the touch driving voltage is sequentially supplied to all of the plurality of touch electrodes during the touch operation, Device.
A gate line formed on the substrate;
A gate insulating layer formed on a front surface of the substrate on which the gate line is formed;
A data line formed on the gate insulating film so as to intersect the gate line;
A thin film transistor formed on the gate insulating film and having a source electrode connected to the data line;
A pixel electrode formed on the gate insulating film to be connected to a drain electrode of the thin film transistor and formed in a pixel region defined by intersection of the gate line and the data line;
An interlayer insulating layer formed on the gate insulating layer on which the data line, the thin film transistor, and the pixel electrode are formed;
A signal line formed on the interlayer insulating film and formed to overlap with the data line;
A passivation film formed on the interlayer insulating film on which the signal lines are formed; And
And a common electrode formed on the passivation film and connected to the signal line through a via hole formed in the passivation film,
Wherein the common electrode comprises a plurality of touch electrodes, each of the touch electrodes is connected to the signal line,
At the time of the display driving, the touch driving is turned off, and at the touch driving time, the display driving is turned off,
Wherein the common voltage is supplied to all of the plurality of touch electrodes through the signal line and the touch driving voltage is sequentially supplied to all of the plurality of touch electrodes during the touch operation, Device.
4. The method according to any one of claims 1 to 3,
Wherein the signal line is formed in parallel with the data line.
4. The method according to any one of claims 1 to 3,
Wherein the signal line is located outside the region where the pixel electrode and the common electrode overlap.
4. The method according to any one of claims 1 to 3,
Wherein each of the touch electrodes has a size corresponding to at least two pixel electrodes.
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