KR102198495B1 - Display device with integrated touch screen - Google Patents

Abstract

The present invention comprises: a panel divided into a display area and a non-display area, and including a plurality of electrodes and a plurality of wires in the display area; A driving IC for applying a common voltage or a touch scan signal to the plurality of electrodes through the plurality of wires; And a shift register for adjusting a timing of application of the common voltage and the touch scan signal, wherein the shift register applies the common voltage to the plurality of electrodes when a driving mode of the panel is a display driving mode, and When the driving mode is a touch driving mode, it relates to a touch screen integrated display device, characterized in that the touch scan signal is applied to the plurality of electrodes.

Description

Display device with integrated touch screen {DISPLAY DEVICE WITH INTEGRATED TOUCH SCREEN}

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

Touch screens include Liquid Crystal Display, Field Emission Display (FED), Plasma Display Panel (PDP), Electroluminescence Device (EL), and electrophoretic display. It is a type of input device installed in an image display device such as, for example, that a user presses (presses or touches) a touch sensor in a touch screen while viewing the image display device to input predetermined information.

Touch screens used in the above-described display devices can be classified into an add-on type, an on-cell type, and an in-cell type according to their structure. The attaching type is a method of attaching the touch screen to the upper plate of the display device after separately manufacturing the display device and the touch screen. The top plate type is a method of directly forming elements constituting a touch screen on the surface of an upper glass substrate of a display device. The integrated type is a method that can achieve a thinner display device and increase durability by embedding a touch screen inside the display device.

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-panel touch screen has a structure in which a separate touch screen is formed on the upper surface of the display device, and can be reduced in thickness compared to the attachable type, but it is still the driving electrode and the sensing electrode constituting the touch screen, and the entire insulating layer to insulate them. There is a problem in that the thickness increases and the number of processes increases, resulting in an increase in manufacturing price.

On the other hand, the integrated touch screen has the advantage of solving the problems caused by the attachment type and the upper panel type touch screen in that durability improvement and thickness reduction are possible. Such an integrated touch screen may be classified into an optical type and a capacitive type touch screen.

In the optical integrated touch screen, a light sensing layer is formed on a thin film transistor substrate array of a display device, and light reflected through an object present in a touched portion is recognized using light or infrared light from a backlight unit. However, the light-type integrated touch screen shows a relatively stable driving performance when the surroundings are dark, but when the surroundings are bright, light stronger than the reflected light acts as noise. This is because the intensity of light reflected by the actual touch is very weak, and an error may occur in touch recognition even if the outside is slightly bright. In particular, the optical touch screen has a problem in that the intensity of light is so strong when the surrounding environment is exposed to sunlight, and in some cases, touch recognition may not be performed.

The capacitive type integrated touch screen can be classified into a self capacitance type and a mutual capacitance type. Mutual capacitance type integrated touch screen divides a common electrode and divides it into a driving electrode and a sensing electrode so that mutual capacitance is formed between the driving electrode and the sensing electrode, thereby reducing the amount of change in mutual capacitance that occurs during touch. It is a method of recognizing a touch by measuring, and in the self-capacitive type integrated touch screen, a touch is recognized by dividing a common electrode and measuring a change in self-capacitance occurring between the common electrode and a user's input.

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

1 is a diagram showing the 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. 1.

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, and the non-display area 12 has A driving IC 20 is formed.

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

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

In the above-described general self-capacitive touch screen, a plurality of electrodes and a plurality of wires are formed in a one-to-one correspondence to apply a common voltage or a touch scan signal to the plurality of electrodes 13 as shown in FIG. 1. .

In addition, the number of electrodes to be included in the touch screen increases according to the display device gradually becoming a large area, and accordingly, the number of wires corresponding to the electrodes increases.

However, if the number of wires connected to the electrode is larger than the number of channels that one touch IC can accommodate, the manufacturing cost may increase because a plurality of touch ICs must be used, and the bezel of the panel increases due to the increase in wiring. There is this.

Accordingly, there is a need for a method to solve the problem of an increase in manufacturing cost and an increase in bezel size that may occur in a general self-capacitive type touch screen integrated display device.

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

In order to achieve the above object, a touch screen integrated display device according to an embodiment of the present invention includes a panel divided into a display area and a non-display area, and including a plurality of electrodes and a plurality of wires in the display area; A driving IC for applying a common voltage or a touch scan signal to the plurality of electrodes through the plurality of wires; And a shift register for adjusting a time point of application 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 When the driving mode is a touch driving mode, the touch scan signal is applied to the plurality of electrodes.

According to various embodiments of the present disclosure, a narrow bezel may be achieved in a self-capacitive touch screen integrated display device.

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

1 is a diagram showing the configuration of a general touch screen integrated display device;
2 is a diagram illustrating a configuration of a touch screen integrated display device according to various embodiments of the present disclosure;
3 is an enlarged view of part A of FIG. 2; And
4 is a timing diagram of signal application to a display section and a touch section of a touch screen integrated display device according to various embodiments of the present disclosure.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Meanwhile, hereinafter, for convenience of explanation, a touch screen integrated display device according to various embodiments of the present invention will be described as an example as a liquid crystal display device, and the present invention is not limited thereto, and a field emission display device, a plasma display panel , Electroluminescent display, electrophoretic display, etc. can be applied to various display devices. 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 display device with an integrated touch screen according to various embodiments of the present disclosure, and FIG. 3 is an enlarged view of portion A of FIG. 2.

A display device with an integrated touch screen according to various embodiments of the present disclosure includes a panel 100 on which a driving IC 200 is formed as shown in FIG. 2.

First, the panel 100 is divided into a display area 110 in which a touch screen (not shown) is embedded, and a non-display area 120 in which the driving IC 200 and shift registers 410 and 420 are formed. , The touch screen performs a function of detecting a user's touch position. In particular, the touch screen applied to the present invention is an integrated touch screen of a self-capacitance method in which display driving and touch driving are temporally divided and driven. In the drawings of the present invention, although a plurality of shift registers are formed and described, this is not possible in an embodiment, and a single shift register may be used in a small-sized touch screen.

The panel 100 may be configured in a form in which 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 crossing the gate line, a plurality of TFTs (Thin Film Transistor) formed at the intersections of the data line and the gate line, and the data line. Pixels are arranged in a matrix form by the crossing structure of the gate lines.

Further, the panel 100 includes a plurality of electrodes 130 and a plurality of wirings 140 in a display area, as shown in FIGS. 2 and 3.

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

In addition, the plurality of electrodes 130 operate as a common electrode for driving the liquid crystal together with the pixel electrode formed in each pixel during the display driving period, and as a touch electrode for sensing a touch position by a touch scan signal during the touch driving period. It works.

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

For example, as shown in FIG. 3, a plurality of wirings 140 connect a plurality of electrodes 130 and the display driving IC 200 to scan a common voltage and a touch output from the driving IC 200. A signal is applied to the plurality of electrodes 130 through respective wires.

Next, as shown in FIG. 3, the driving IC 200 is for driving the plurality of electrodes 130 as a common electrode or a touch electrode, and may include a common voltage generator and a touch scan signal generator. .

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

The above-described common voltage generator generates a common voltage Vcom and applies it to a plurality of electrodes under the control of the shift registers 410 and 420, and the touch scan signal generator generates a touch scan signal and generates a touch scan signal according to the control of the shift registers 410 and 420. It is applied with a plurality of electrodes.

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

In addition, the driving IC 200 receives a touch sensing signal according to a touch scan signal from the plurality of electrodes 130 in the panel, calculates touch coordinates, and detects a touch input position by a user. (320) may be additionally included. The calculated touch coordinates are transmitted to the system unit of the display device so that the user's touch coordinates generated on the panel can be detected.

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

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

In other words, when the driving mode of the panel is the display driving mode, the driving IC 200 controls the plurality of electrodes 130 to apply a common voltage so that the panel drives 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 the plurality of electrodes so that the panel performs touch driving.

In addition, when the driving mode of the panel is a display driving mode, the shift register controls a common voltage to be simultaneously applied to all of the plurality of electrodes. When the driving mode of the panel is a 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 for each divided group.

For example, when a plurality of electrodes are divided into 10 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, sends a touch scan signal in the first group. It is also possible to apply sequentially to the tenth group.

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

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

In other words, referring to FIG. 3, when the divided group is a group divided in the direction of the gate line of the panel, the shift register is for each electrode included in the divided group (TSU1->TSU2->TSU3->TSU4). The touch scan signals are sequentially applied. This operation is repeatedly performed until all touch scan signals are applied to 10 groups.

In the present invention, a case in which a plurality of shift registers are formed is described, but this is not possible in one embodiment, and a single shift register may be used in a small-sized touch screen. Even when a single shift register is used, the panel may have When 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 for each divided group, or a plurality of electrodes may be used as a group. It is also possible to control so that the touch scan signal is simultaneously applied to all of the plurality of electrodes without dividing.

In addition, the shift register may be driven by receiving a synchronization signal indicating a display driving mode and a touch driving mode from an external source, or may be driven through a synchronization signal generated by 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 the touch scan signal generator and the plurality of electrodes 130 are connected.

Hereinafter, the above-described driving of the shift register will be described in detail with reference to FIG. 3.

FIG. 3 is an enlarged view of part A of FIG. 2.

As shown in FIG. 3, the shift registers 410.420 may include a first shift register and a second shift register, and may be formed one by one 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.

In more detail, the first shift register adjusts the application timing of the signal applied to the electrodes formed on the left side of the panel based on the driving IC, and the second shift register is formed on the right side of the panel based on the driving IC. The timing of application of signals applied to the existing electrodes can be adjusted.

For example, the first shift register 410 applies a common voltage applied to the electrodes TSU1 and TSU2 formed on the left side of the panel or a touch scan signal, and the touch scan signal is a first touch sensing unit. It is sequentially applied to the (TSU1) and the second touch sensing unit (TSU2). The second shift register 420 applies a common voltage applied to the electrodes TSU3 and TSU4 formed on the right side of the panel or applies a touch scan signal, and the touch scan signal includes the third touch sensing unit TSU3 and It is sequentially applied 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 used as common electrodes for driving the display by the first to fourth touch sensing units TSU1 to TSU4. A common voltage is applied to operate, and 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.

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

Here, when the shift register applies a touch scan signal to the first to fourth touch sensing units, the touch scan signal may be applied to each of the first to fourth touch sensing unit groups on the entire panel, and each touch group formed in a row A touch scan signal may be applied to each of the first to fourth touch sensing units at.

For reference, in FIG. 3, the touch sensing unit is shown as only one electrode row, but 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 are Depending on the size of the panel, it may be simultaneously connected to two or more touch sensing units including two or more electrode rows.

In addition, even when a single shift register is included, it may 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 may be divided into a plurality of touch sensing units and connected with only one shift register. In this case, when one shift register is included, the electrodes of the entire panel can be used as one touch sensing unit to simultaneously apply a touch scan signal to all electrodes.

When the above-described shift register is applied to a touch screen integrated display device, a large-area display device can be driven with only one touch IC. This is because a plurality of electrodes and a channel of the driving IC are not connected in a one-to-one correspondence through wiring, but because the embodiment of the present invention is connected using a shift resistor, there is no restriction on the channel of the driving IC.

In addition, when the above-described shift register is applied to a touch screen integrated display device, it is possible to solve the problem that the bezel of the panel is increased. Because a plurality of electrodes and a channel of the driving IC are connected using a shift resistor, a plurality of switching units and a complicated wiring structure for driving a conventional touch screen integrated display device are not required, and the number of wiring is reduced. This is because it becomes possible.

Hereinafter, a timing diagram for applying a signal to the touch screen integrated display device as described above will be described with reference to FIG. 4.

4 is a timing diagram of signal application to a display section and a touch section of a display device with integrated touch screen according to various embodiments of the present disclosure.

This timing diagram is an example for the case of having 10 rows of Touch Blocks in HD Display (1280 x 720).

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

First, according to the start pulse (STR) that starts the display section, CLK1 and CLK2 apply alternating pulse signals so that they do not overlap each other, and in synchronization with CLK1 and CLK2, the gate signal is transferred from column 1 to the gate line of the lower substrate of the panel. It is applied sequentially up to row 1280.

Next, when the display section ends and the touch section starts within one frame section, the T-CLK1 and T-CLK2 alternate pulse signals are applied so that they do not overlap with each other according to the start pulse (T-STR) that starts the touch section. And, in synchronization with CLK1 and CLK2, touch scan signals are sequentially applied to the touch blocks of 10 rows.

That is, in order to sequentially apply the touch scan signal by 10 rows by using the shift register, and to apply the touch scan signal to one row in more detail, shift in the order of TSU1->TSU2->TSU3->TSU4 in FIG. The register is activated. This operation is repeatedly performed until a touch scan signal is applied to row 10.

For reference, T-CLK1 and T-CLK 2 are available as separate signals, but the same operation is possible even if CLK1/2 is modulated and changed to output a pulse such as T-CLK during the touch period.

Those skilled in the art to which the present invention pertains will appreciate that the above-described present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof.

Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

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

Claims (12)

A panel divided into a display area and a non-display area and including a plurality of electrodes and a plurality of wires in the display area;
A driving IC for applying a common voltage or a touch scan signal to the plurality of electrodes through the plurality of wires; And
And a shift register that adjusts the application timing of the common voltage and the touch scan signal,
In the non-display area of the panel, a common voltage transfer line for transferring the common voltage, a plurality of touch scan signal transfer lines for transferring the touch scan signal, and the plurality of wires are connected to the common voltage transfer line or the plurality of lines. A plurality of switches connected to the touch scan signal transfer wiring of and the shift register controlling the plurality of switches are disposed,
When the driving mode of the panel is a display driving mode, the shift register controls the plurality of switches so that the plurality of wirings are connected to the common voltage transfer wiring to apply the common voltage to the plurality of electrodes, and When the driving mode is a touch driving mode, the plurality of switches are controlled so that the plurality of wires are connected to the plurality of touch scan signal transmission wires, and the touch scan signal is applied to the plurality of electrodes. Device.
The method of claim 1,
Wherein the shift resistor simultaneously applies the common voltage to all of the plurality of electrodes.
The method of claim 2,
Wherein the shift register divides a plurality of electrodes into groups and sequentially applies the touch scan signal to each of the divided groups.
The method of claim 3,
The divided group is a group divided in a direction of a gate line of a panel.
The method of claim 4,
The shift register sequentially applies the touch scan signal to each electrode included in the divided group.
The method of claim 3,
The divided group is a group divided toward a data line “‡” of a panel.
The method of claim 1,
Wherein the shift register includes a first shift register and a second shift register, and is formed one on both sides of the panel.
The method of claim 7,
The first shift register adjusts the application point of the signal applied to the electrodes formed on the left side of the panel based on the driving IC, and the second shift register is on the right side of the panel based on the driving IC. A touch screen integrated display device, characterized in that controlling an application point of a signal applied to the formed electrodes.
The method of claim 1,
The driving IC,
And a common voltage generator that generates the common voltage.
The method of claim 1,
The touch scan signal is generated inside the driving IC or formed outside the driving IC and applied to the driving IC.
The method of claim 1,
The driver IC is disposed in the non-display area under the panel,
The common voltage transmission line, the plurality of touch scan signal transmission lines, the plurality of switches, and the shift register are disposed in the non-display area of the side of the panel.
The method of claim 1,
Wherein the touch scan signal has a voltage corresponding to the common voltage as a low level voltage and a voltage greater than the common voltage as a high level voltage.

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