KR20150078765A - Display device with integrated touch screen - Google Patents

Abstract

The present invention provides a liquid crystal display device comprising: a panel divided into a display region and a non-display region, the panel including a plurality of electrodes and a plurality of wirings in the display region; A driving IC for applying a common voltage or a touch scan signal to the plurality of electrodes through the plurality of wirings; And a shift register for adjusting the application time of the common voltage and the touch scan signal, wherein the shift register applies the common voltage to the plurality of electrodes when the driving mode of the panel is a display driving mode, And the touchscreen signal is applied to the plurality of electrodes when the driving mode is the touch driving mode.

Description

DISPLAY DEVICE WITH INTEGRATED TOUCH SCREEN [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a touch screen integrated display device.

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

The touch screen used in the above-described display device can be divided into an add-on type, an on-cell type, and an in-cell type according to its structure. The attachment type is a method in which a touch screen is attached to an upper plate of a display device after separately manufacturing a display device and a touch screen. The upper type is a method of directly forming elements constituting the touch screen on the upper glass substrate surface of the display device. In the integrated type, a touch screen is built in a display device, thereby achieving a thin display device and increasing durability.

However, the attachable touch screen has a structure in which the completed touch screen is mounted on the display device and is thick, and the brightness of the display device becomes dark, thereby reducing visibility. In addition, the upper-surface type touch screen has a structure in which a separate touch screen is formed on the upper surface of the display device. Though it is possible to reduce the thickness of the touch screen, the thickness of the driving electrode and the sensing electrode constituting the touch screen, There is a problem that the manufacturing cost increases due to an increase in thickness and an increase in the number of processes.

On the other hand, the integrated touch screen has advantages of improving durability and thinning, and solving the problems caused by the attachment type and the upper type touch screen. Such an integrated touch screen can be classified into a light type and a capacitive touch screen.

The optical type integrated touch screen is a method of forming a light sensing layer on a thin film transistor substrate array of a display device and recognizing light reflected through an object existing in a touched portion by using light from a backlight unit or infrared light. However, the optical type integrated touch screen exhibits a relatively stable driving performance in the case of a dark environment, 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 screen 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 in some cases.

The capacitance type integrated touch screen can be classified into a self capacitance type and a mutual capacitance type. The mutual capacitance type integrated touch screen divides the common electrode into a driving electrode and a sensing electrode so that a mutual capacitance is formed between the driving electrode and the sensing electrode, And the touch sensing method is a method of recognizing a touch by dividing a common electrode and measuring a change amount of a self capacitance between a common electrode and a user's input.

Hereinafter, the general self-capacitance type touch screen integrated display device described with reference to FIG. 1 will be described.

FIG. 1 is a diagram illustrating a configuration of a general touch screen integrated display device.

A typical touch screen integrated display device includes a panel 10 and a touch IC 30, as shown in Fig.

The panel is divided into a display area 11 and a non-display area 12. A plurality of electrodes 13 and a plurality of wirings 14 are formed in the display area 11, A driving IC 20 is formed.

Here, the driving IC 20 may serve to apply a common voltage or a touch scan signal to a plurality of electrodes 13 through a plurality of wirings 14. [

The touch IC 30 generates a touch scan signal and applies it to the driving IC 20. The touch IC 30 senses a change amount of capacitance generated in the plurality of electrodes 13 according to the applied touch scan signal and senses the touch input position of the user It plays a role.

1, a common self-capacitance touch screen has a plurality of electrodes and a plurality of wirings formed in a one-to-one correspondence in order to apply a common voltage or a touch scan signal to a plurality of electrodes 13 .

In addition, the number of electrodes to be included in the touch screen is increased according to the display device which gradually becomes large-sized, thereby increasing the number of wirings corresponding to the electrodes.

However, when the number of wirings connected to the electrodes is larger than the number of channels that can be accommodated by a single touch IC, a plurality of touch ICs must be used, resulting in an increase in manufacturing cost and an increase in the number of bezels .

Therefore, there is a need for a solution to the problem of increase in manufacturing cost and increase in bezel size that can occur in a general self-capacitance touch screen integrated display device.

The present invention is to provide a self-capacitance touch screen integrated display capable of achieving a narrow bezel.

According to an aspect of the present invention, there is provided a touch screen integrated type display device including a panel including a plurality of electrodes and a plurality of wires in the display region, the display region being divided into a display region and a non-display region. A driving IC for applying a common voltage or a touch scan signal to the plurality of electrodes through the plurality of wirings; And a shift register for adjusting the application time of the common voltage and the touch scan signal, wherein the shift register applies the common voltage to the plurality of electrodes when the driving mode of the panel is a display driving mode, And the touch scan signal is applied to the plurality of electrodes when the driving mode is the touch driving mode.

According to various embodiments of the present invention, a narrow bezel can be achieved in a self-capacitance touch screen integrated display device.

According to various embodiments of the present invention, it is possible to drive a large area touch screen utilizing only a single touch IC.

FIG. 1 is a view illustrating a configuration of a general touch screen integrated display device;
2 is a block diagram of a touch screen integrated display device according to various embodiments of the present invention;
FIG. 3 is an enlarged view of a portion A in FIG. 2; FIG. And
FIG. 4 is a timing diagram illustrating a display period and a touch period of a touch section of a touch screen integrated display device according to various embodiments of the present invention. FIG.

Various embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Hereinafter, a touch screen integrated type display device according to various embodiments of the present invention will be described as an example of a liquid crystal display device for convenience of explanation, and the present invention is not limited thereto, and a field emission display device, a plasma display panel , An electroluminescent display device, an electrophoretic display device, and the like. In addition, a description of the general configuration of the liquid crystal display device will be omitted.

FIG. 2 is a diagram illustrating a configuration of a touch screen integrated display device according to various embodiments of the present invention, and FIG. 3 is an enlarged view of a portion A of FIG.

The touch screen integrated type display device according to various embodiments of the present invention includes the panel 100 in which the driving IC 200 is formed as shown in FIG.

First, the panel 100 is divided into a display area 110 in which a touch screen (not shown) is built, a non-display area 120 in which the driving IC 200 and the shift registers 410 and 420 are formed, , And the touch screen performs a function of sensing the touch position of the user. Particularly, the touch screen applied to the present invention is a self-capacitance type integrated touch screen in which the display drive and the touch drive are driven in time division. In the drawings of the present invention, a plurality of shift registers are described. However, this is not an embodiment, and a single shift register may be utilized in a touch screen of a small size.

The panel 100 may be configured such that a liquid crystal layer is formed between two substrates. In this case, the lower substrate of the panel 100 includes a plurality of gate lines, a plurality of data lines intersecting the gate lines, a plurality of TFTs (thin film transistors) formed at the intersections of the data lines and the gate lines, The pixels are arranged in a matrix by the intersection structure of the gate lines.

 2 and 3, the panel 100 includes a plurality of electrodes 130 and a plurality of wirings 140 in a display region.

Here, the plurality of electrodes 130 is formed in the display region 110 of the panel 100 to overlap the plurality of pixel electrodes. In other words, the plurality of electrodes is not formed for each pixel, but is formed in the display region 110 overlapping a plurality of pixels.

The plurality of electrodes 130 operate as a common electrode for driving the liquid crystal along with the pixel electrodes formed in the respective pixels during the display driving period and the touch electrodes for sensing the touch position by the touch scan signal during the touch driving period .

The plurality of wirings 140 connect each of the plurality of electrodes 130 to the driving IC 200.

3, the plurality of wirings 140 connect the plurality of electrodes 130 to the display driving IC 200, and the common voltage output from the driving IC 200, Signal to be applied to the plurality of electrodes 130 through respective wires.

3, the driving IC 200 may include a common voltage generator and a touch scan signal generator for driving the plurality of electrodes 130 by a common electrode or a touch electrode .

However, a touch scan signal may be generated outside the driving IC and applied to the inside of the driving IC.

The common voltage generator generates the common voltage Vcom and applies the common voltage Vcom to the plurality of electrodes under the control of the shift registers 410 and 420. The touch scan signal generator generates a touch scan signal and controls the shift register 410 and 420 according to the control of the shift registers 410 and 420 And is applied to a plurality of electrodes.

Here, the touch scan signal may be a touch driving voltage, and the touch driving voltage may be greater than a common voltage applied to a plurality of electrodes of the panel for driving the display. In this case, the touch driving voltage has the voltage corresponding to the common voltage as the low level voltage, and the higher voltage can have the high level voltage.

The driving IC 200 receives the touch sensing signal corresponding to the touch scan signal from the plurality of electrodes 130 in the panel, calculates touch coordinates, and detects a touch input position by a user. 0.0 > 320 < / RTI > The calculated touch coordinates are transmitted to the system unit of the display device so that the touch coordinates of the user generated on the panel can be sensed.

Next, shift registers 410 and 420 are formed in the non-display area 120 of the panel 100 to adjust the common voltage and the application time of the touch scan signal.

For example, the shift register applies a common voltage or applies a touch scan signal to a plurality of electrodes 130 through a plurality of wirings 140 according to a driving mode of the panel 100.

In other words, if the driving mode of the panel is the display driving mode, the driving IC 200 controls the common voltage to be applied to the plurality of electrodes 130 to cause the panel to drive the display, and when the driving mode of the panel is the touch driving mode , The driving IC 200 controls the touch scan signal to be applied to a plurality of electrodes, thereby causing the panel to perform touch driving.

The shift register controls the common voltage to be applied to all the plurality of electrodes at the same time if the drive mode of the panel is the display drive mode and controls the plurality of electrodes 130 May be divided into a plurality of groups and the touch scan signals may be sequentially applied to the divided groups.

For example, when a plurality of electrodes are divided into ten groups, the shift register applies a common voltage to all the electrodes of the panel during the display driving mode, and during the touch driving mode, It may be sequentially applied to the tenth group.

Here, the divided group may be a group divided in the gate line direction of the panel, or a group divided in the data line direction of the panel.

If the divided group is a group divided in the gate line direction of the panel, the shift register sequentially applies touch scan signals to the electrodes included in the divided group.

3, when the divided group is a group divided in the gate line direction of the panel, the shift register is divided by the electrode included in the divided group (TSU1-> TSU2-> TSU3- > TSU4) And sequentially applies a touch scan signal. This operation is repeatedly performed until all the touch scan signals are applied to the ten groups.

In the present invention, a plurality of shift registers are formed. However, this is not applicable to one embodiment. A single shift register may be used in a touch screen of a small size. Even when a single shift register is used, If the driving mode is the touch driving mode, the plurality of electrodes 130 in the panel 100 may be divided into a plurality of groups, and the touch scan signals may be sequentially applied to the divided groups. Alternatively, The touch scan signal may be simultaneously applied to all of the plurality of electrodes without being divided.

The shift register may be driven by receiving a synchronizing signal indicating a display driving mode and a touch driving mode from an external source, or may be driven through a synchronizing signal generated in itself. That is, the common voltage generator and the plurality of electrodes 130 are connected to each other according to an external or self-generated synchronization signal, or a plurality of electrodes 130 are connected to the touch scan signal generator.

Hereinafter, the driving of the shift register will be described in detail with reference to FIG.

3 is an enlarged view of a portion A in Fig.

As shown in FIG. 3, the shift register 410.420 may include a first shift register and a second shift register, and may be formed on both sides of the panel. Here, both sides of the panel 100 refer to left and right sides of the driving IC 200 formed in the non-display area 120 of the panel.

More specifically, the first shift register controls the application time point of the signal applied to the electrodes formed on the left side of the panel with respect to the driving IC, and the second shift register is formed on the right side of the panel with reference to the driving IC The application time point of the signal applied to the electrodes can be adjusted.

For example, the first shift register 410 applies a common voltage or applies a touch scan signal to the electrodes TSU1 and TSU2 formed on the left side of the panel, and the touch scan signal is applied to the first touch sensing unit (TSU1) and the second touch sensing unit (TSU2). The second shift register 420 applies a common voltage or applies a touch scan signal to the electrodes TSU3 and TSU4 formed on the right side of the panel and the touch scan signal is applied to the third touch sensing unit TSU3 and To the second touch sensing unit TSU4.

In other words, when the driving mode of the panel is the display driving mode, the first shift register 410 and the second shift register 420 are connected to the first to fourth touch sensing units TSU1 to TSU4 as common electrodes for driving the display In a preferred embodiment, the first shift register 410 and the second shift register 420 simultaneously apply a common voltage to the first to fourth touch sensing units TSU1 to TSU4.

When the driving mode of the panel is the touch driving mode, the first shift register 410 and the second shift register 420 operate as the touch electrodes for the touch driving of the first to fourth touch sensing units TSU1 to TSU4. A touch scan signal is applied. In a preferred embodiment, the first shift register 410 and the second shift register 420 sequentially apply touch scan signals to the first to fourth touch sensing units TSU1 to TSU4 for each unit group.

Here, when the shift register applies the touch scan signal to the first to fourth touch sensing units, the touch scan signal may be applied to the first to fourth touch sensing unit groups in the entire panel, A touch scan signal may be applied to each of the first to fourth touch sensing units.

In FIG. 3, the touch sensing unit is illustrated as only one electrode row. However, in a preferred embodiment, two or more electrode rows may be one touch sensing unit. Therefore, the first and second shift registers 410 and 420 And may be simultaneously connected to two or more touch sensing units including two or more electrode rows according to the size of the panel.

In addition, even when a single shift register is included, it can be simultaneously connected to two or more touch sensing units including two or more electrode rows on one side of the panel. That is, the electrodes of the entire panel can be divided into a plurality of touch sensing units and connected by only one shift register. When a single shift register is included, the electrodes of the entire panel may be used as a single touch sensing unit to simultaneously apply a touch scan signal to all the electrodes.

When the above-described shift register is applied to a touch screen integrated display device, it is possible to drive a large area display device with only one touch IC. This is because the channel of the driving IC is not limited because the plurality of electrodes and the channels of the driving IC are connected in a one-to-one correspondence with each other through the wiring, but the embodiment of the present invention is connected using the shift register.

When the above-described shift register is applied to a touch screen integrated type display device, the problem that the bezel of the panel is stretched can be solved. This is because the plurality of electrodes and the channel of the driving IC are connected to each other by utilizing the shift register, so that a plurality of switching parts and a complicated wiring structure for driving the conventional touch screen integrated type display device are not needed and the number of wirings is reduced, .

Hereinafter, a signal application timing diagram of the touch screen integrated type display device as described above will be described with reference to FIG.

FIG. 4 is a timing diagram illustrating a display duration and a touch duration of a touch section of a touch screen integrated display device according to various embodiments of the present invention. Referring to FIG.

This timing diagram is an embodiment of a case where the HD display (1280 x 720) has ten rows of touch blocks.

As shown in FIG. 4, the integrated touch screen type display device according to the present invention is divided into a display period and a touch period according to a driving mode of the panel in one frame period.

First, CLK1 and CLK2 apply an alternating pulse signal in such a manner that they do not overlap with each other according to a start pulse (STR) starting a display period, and the gate signal is synchronized with CLK1 and CLK2, Up to 1280 rows.

Next, when the display period ends and the touch period starts within one frame period, T-CLK1 and T-CLK2 do not overlap each other according to the start pulse (T-STR) And synchronously with the CLK1 and CLK2, the touch scan signal is sequentially applied to the ten-row touch block.

That is, in order to sequentially apply the touch scan signals by ten rows using the shift register and to apply the touch scan signals to one row in a more detailed manner, shifts TSU1- > TSU2- > TSU3- > The register is operated. This operation is repeatedly performed until the touch scan signal is applied to the 10th row.

For reference, T-CLK1 and T-CLK2 can be used as separate signals, but the same operation is possible by modulating CLK1 / 2 and outputting the same pulse as T-CLK during the touch period.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Panel 110: Display area
120: non-display region 130: electrode
140: wiring 200: driving IC
410: first shift register 420: second shift register

Claims (10)

A panel divided into a display region and a non-display region, the panel including a plurality of electrodes and a plurality of wirings in the display region;
A driving IC for applying a common voltage or a touch scan signal to the plurality of electrodes through the plurality of wirings; And
And a shift register for controlling the application time of the common voltage and the touch scan signal,
The shift register applies the common voltage to the plurality of electrodes when the driving mode of the panel is the display driving mode and applies the touch scan signal to the plurality of electrodes when the driving mode of the panel is the touch driving mode Wherein the display device is a touch screen type display device.
The method according to claim 1,
Wherein the shift register simultaneously applies the common voltage to all of the plurality of electrodes.
3. The method of claim 2,
Wherein the shift register divides the plurality of electrodes into groups and sequentially applies the touch scan signals to the divided groups.
The method of claim 3,
Wherein the divided group is a group divided in a gate line direction of the panel.
5. The method of claim 4,
Wherein the shift register sequentially applies the touch scan signal to each electrode included in the divided group.
The method of claim 3,
Wherein the divided group is a group divided into a data line direction of the panel.
The method according to claim 1,
Wherein the shift register includes a first shift register and a second shift register, and is formed on each side of the panel.
8. The method of claim 7,
The first shift register adjusts the application time point of a signal applied to the electrodes formed on the left side of the panel with respect to the driving IC and the second shift register controls the application time of the signal applied to the electrodes on the right side of the panel Wherein the control unit controls the application time of the signal applied to the electrodes formed on the touch screen.
The method according to claim 1,
The driving IC includes:
And a common voltage generator for generating the common voltage.
The method according to claim 1,
Wherein the touch scan signal is generated inside the driving IC or is formed outside the driving IC and is applied to the driving IC.

Images