CN203217536U - A kind of capacitive built-in touch screen and display device - Google Patents

Abstract

The embodiment of the utility model provides a capacitance-embedded touch screen and a display device, solving the connecting problem of splitting of a common electrode designed based on common pixel. The capacitance-embedded touch screen comprises an array substrate, wherein a grid line, a data line and a common electrode layer are arranged on the array substrate, the common electrode layer comprises a plurality of touch control driving electrode units and touch sensing electrode units mutually insulated, each touch control driving electrode unit comprises a plurality of touch control driving sub electrodes, each touch tensing electrode unit comprises a plurality of touch control sensing sub electrodes, one of the touch control driving sub electrode and the touch control sensing sub electrode is connected along the direction of the data line by adopting a bridging manner, and the other is directly connected along the direction of the grid line, or one of the touch control driving sub electrode and the touch control sensing sub electrode is connected along the direction of the grid line in a bridging manner, and the other is directly connected along the direction of the data line.

Description

A kind of capacitive built-in touch screen and display device

technical field

The utility model relates to the technical field of liquid crystal display, in particular to a capacitance embedded touch screen and a display device. the

Background technique

A touch screen is an input device that allows a user to directly use a hand or an object to input a user's instruction by selecting an instruction content displayed on a screen such as an image display. The selected icon has commands to drive the liquid crystal display device to achieve a specific display. the

Existing touch screens are mainly divided into two types: external type and built-in type according to their different positions on the liquid crystal display; among them, the built-in type touch screen is set inside the panel of the liquid crystal display device, which can greatly reduce the The thickness of LCD products. At present, there are many design schemes for the display device of the embedded touch screen. Generally, one or two layers of transparent electrodes are added to the content of the liquid crystal box to realize the touch function. The process of the embedded touch screen with this structure is complicated. At the same time, Affect the transmittance of the liquid crystal display. the

Utility model content

The embodiment of the utility model provides a capacitive built-in touch screen and a display device, which are used to solve the connection problem of the common electrode division of the common pixel design. the

An embodiment of the utility model provides a capacitive embedded touch screen, the touch screen includes an array substrate, and the array substrate is provided with gate lines, data lines and a common electrode layer, wherein,

The common electrode layer includes a plurality of mutually insulated touch driving electrode units and touch sensing electrode units;

The touch driving electrode unit includes a plurality of touch driving sub-electrodes, the touch sensing electrode unit includes a plurality of touch sensing sub-electrodes, and one of the touch driving sub-electrodes and the touch sensing sub-electrodes uses a bridge connected along the direction of the data line, and the other sub-electrode is directly connected along the direction of the gate line; or one of the touch driving sub-electrode and the touch sensing sub-electrode is connected along the Direct connection in the direction of the line. the

Preferably, the touch driving sub-electrodes are directly connected along the direction of the gate lines, and when the touch sensing sub-electrodes are connected by bridging along the direction of the data lines, at least one gate line is used as a touch scanning line during the touch period, and The touch scanning signal is applied to the touch driving electrode unit. the

Preferably, the touch screen further includes signal connection lines, the touch driving sub-electrodes are directly connected along the direction of the gate lines, and when the touch sensing sub-electrodes are bridge-connected along the direction of the data lines, the touch sensing sub-electrodes pass through The signal connection line is bridge-connected to the adjacent touch sensing sub-electrodes in the direction of the data line, and the signal connection line is arranged in the same direction as the data line. the

Preferably, the touch screen further includes a signal connection line, and the touch driving sub-electrodes are connected by bridging along the direction of the data lines. When the touch sensing sub-electrodes are directly connected along the gate line, the touch driving sub-electrodes pass through The signal connection line is bridge-connected to the touch driving sub-electrodes adjacent in the direction of the data line, and the signal connection line is arranged in the same direction as the data line. the

Preferably, the signal connection lines are arranged on the same layer as the data lines. the

Preferably, the touch screen further includes a signal connection line, the touch driving sub-electrodes are directly connected along the direction of the data lines, and when the touch sensing sub-electrodes are bridge-connected along the direction of the gate lines, the touch sensing sub-electrodes pass through The signal connection lines are bridge-connected to the adjacent touch sensing sub-electrodes in the row direction, and the signal connection lines are arranged in the same direction as the gate lines. the

Preferably, the touch screen further includes a signal connection line, and the touch driving sub-electrodes are bridge-connected along the gate line direction, and when the touch sensing sub-electrodes are directly connected along the data line direction, the touch driving sub-electrodes pass through The signal connection line is bridge-connected to the touch driving sub-electrodes adjacent to the gate line, and the signal connection line is arranged in the same direction as the gate line. the

Preferably, the signal connection lines are arranged on the same layer as the gate lines. the

A display device provided by an embodiment of the present invention includes the touch screen. the

Preferably, when the signal connection lines on the touch screen are arranged in the same direction as the data lines, the signal connection lines are arranged in the area corresponding to the blue pixels. the

Embodiments of the present invention provide a touch screen and a display device, the touch screen includes an array substrate, and the array substrate is provided with gate lines, data lines and a common electrode layer, wherein the common electrode layer includes a plurality of mutually insulated The touch driving electrode unit and the touch sensing electrode unit; the touch driving electrode unit includes a plurality of touch driving sub-electrodes, the touch sensing electrode unit includes a plurality of touch sensing sub electrodes, and the touch driving sub-electrodes One of the electrodes and the touch sensing sub-electrode is connected along the direction of the data line by a bridge, and the other sub-electrode is directly connected along the direction of the gate line; or one of the touch driving sub-electrodes and the touch sensing sub-electrode is connected by a bridge The other sub-electrode is connected along the direction of the gate line, and the other sub-electrode is directly connected along the direction of the data line; the touch screen display device forms the touch driving electrode unit and the touch sensing electrode unit of the touch screen by designing the division scheme of the common electrode and using the bridging method and the direct connection method , or form the touch-sensing electrode unit and the touch-driving electrode unit of the touch screen by means of bridging and direct connection, and use the bridging structure to connect the second sub-electrodes arranged in the vertical direction, which solves the problem of making an embedded touch screen built-in touch panel based on ordinary pixels Connection issues in the common electrode split scheme when displaying devices. the

Description of drawings

Figure 1 is a top plan view of the array substrate provided by Embodiment 1 of the present utility model;

Fig. 2 is a sectional structure diagram along the A1-A direction in Fig. 1;

Fig. 3 is the plane structural diagram of the common electrode layer that the utility model embodiment provides;

Fig. 4 is the equivalent circuit diagram of the common electrode that the utility model embodiment provides;

Fig. 5 is a top plan view of the array substrate provided by Embodiment 2 of the present invention;

Fig. 6 is a top plan view of the array substrate provided by the third embodiment of the utility model;

FIG. 7 is a top plan view of the array substrate provided by Embodiment 4 of the present invention. the

Detailed ways

The embodiment of the utility model provides a capacitive embedded touch screen and a display device, which are used to solve the connection problem in the common electrode division scheme based on common pixel design. the

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. the

Embodiment 1 of the present utility model provides a capacitive embedded touch screen, and the touch screen includes an array substrate, as shown in FIG. 1 . As can be seen from FIG. 1, the array substrate is provided with gate lines 101, data lines 102 and a common electrode layer 103, wherein,

The common electrode layer 103 includes a plurality of mutually insulated touch driving electrode units 1031 and touch sensing electrode units 1032;

The touch driving electrode unit 1031 includes a plurality of touch driving sub-electrodes 1031a, and the touch sensing electrode unit 1032 includes a plurality of touch sensing sub-electrodes 1032b, wherein the touch driving sub-electrodes 1031a adopt a bridge method along the The touch sensing sub-electrodes 1032b are directly connected along the direction of the gate lines. the

It can also be seen from FIG. 1 that the touch screen further includes a signal connection line 104, the touch driving sub-electrode 1031a is bridge-connected along the direction of the data line 102, and the touch-sensitive sub-electrode 1032b is directly connected along the direction of the gate line 101. At this time, the touch driving sub-electrode 1031a is bridge-connected to the adjacent touch driving sub-electrode in the direction of the data line 102 through the signal connection line 104 , and the signal connection line 104 is arranged in the same direction as the data line 102 . the

FIG. 2 is a cross-sectional structure diagram along the dotted line A1-A in FIG. 1. It can be seen from FIG. 2 that the array substrate further includes a substrate 201, a metal line 202, a gate insulating layer 203, an insulating layer 204, and a pixel electrode. 205 , passivation layer 206 , via hole 207 and metal layer 208 . in,

The substrate 201 is a glass substrate;

The gate line 101 is located above the substrate 201;

The metal line 202 is arranged on the same layer as the gate line 101, and is parallel to the gate line 101; the metal line 102 is connected to the common electrode layer 103 through a via hole, so as to reduce the resistance of the common electrode layer 103. the

The gate insulating layer 203 is located above the gate line 101 and the metal line 202 for insulating the gate from other electrodes. the

The signal connection line 104 is disposed on the same layer as the data line 102 , and is made of copper, iron and other metals. the

The insulating layer 204 is located between the signal connection line 104 and the pixel electrode 205 for insulating the pixel electrode 205 from the signal connection line 104 . the

The pixel electrode 205 is located above the first insulating layer 204 and is made of a transparent conductive material, such as indium tin oxide (ITO). the

The passivation layer 206 is located between the pixel electrode 205 and the metal layer 208 for insulating the pixel electrode 205 from the metal layer 208 . the

The via hole 207 is used to connect the signal connection line 104 and the metal layer 208 through the via hole. the

The metal layer 208 is located between the passivation layer 206 and the common electrode layer 103 , and is directly connected to the common electrode layer 103 for reducing the resistance of the common electrode layer 103 . the

The common electrode layer 103 is located above the metal layer 208, and the common electrode layer 103 includes a touch driving electrode unit 1031 and a touch sensing electrode unit 1032, wherein the touch driving sub-electrodes forming the touch driving electrode unit 1031 1031a is connected by a signal connection line 104 . the

When the user touches the touch screen with a hand or a stylus, the user couples with the common electrode layer 103 at the touch point to generate coupling capacitance, thereby affecting the output voltage and output current at the contact point. If the output voltage or/and output current at the location changes, it means that there is a touch action at the location. the

Further, after the touch screen determines whether it is touched, it is also necessary to determine the specific position of the touch point on the touch panel. the

In the array substrate provided by Embodiment 1 of the present utility model, as shown in FIG. 101 is electrically connected, the source 105b is connected to the data line 102, and the drain 105c is electrically connected to the pixel electrode through a via hole. The thin film transistor 105 is used to control the voltage of the pixel electrode 205 and the common electrode 103. By changing the voltage at both ends of the pixel electrode 205 and the common electrode 103, the electric field between the two electrodes is changed to change the liquid crystal display device. brightness to achieve different grayscale display. the

In the touch screen provided by the embodiment of the present invention, the common electrode layer is improved so that multiple touch drive sub-electrodes are connected together to form a touch drive electrode unit of the touch screen. The electrodes are used to form the touch sensing electrode unit of the touch panel. The touch driving electrode unit and the touch sensing electrode unit are arranged vertically and intersecting, and can be generated by the voltage output from the touch driving electrode unit and the touch sensing electrode unit. The row or column that changes determines the specific position of the touch point in the touch panel. the

A common electrode layer is formed on the metal layer 208 , and then, using a patterning process, as shown in FIG. 3 , the common electrode layer is divided into touch driving electrode units 1031 and touch sensing electrode units 1032 arranged vertically and intersecting. the

As shown in FIG. 3, the touch sensing electrode unit 1032 is a horizontal array, and each horizontal array is electrically isolated from the adjacent horizontal array; each horizontal array includes a plurality of touch sensing sub-electrodes 1032b, and each horizontal The touch sensing sub-electrodes 1032b are electrically connected sequentially; the touch sensing sub-electrodes 1032b are formed by electrically connecting common electrodes of a plurality of pixels. the

The touch driving electrode unit 1031 is a vertical array, and each vertical array is electrically isolated from adjacent vertical arrays. Each vertical array includes a plurality of touch driving sub-electrodes 1031a, and each vertical touch driving sub-electrode 1031a is electrically connected in sequence; the touch driving sub-electrodes 1031a are formed by electrically connecting common electrodes of multiple pixels . the

Since the liquid crystal display device is viewed as a whole, the common electrode layer 103 is continuous on the entire surface. Therefore, in the process of etching and forming the touch driving electrode unit 1031 and the touch sensing electrode unit 1032 on a continuous common electrode layer 103, as shown in FIG. The multiple touch sensing sub-electrodes 1032b in each horizontal direction are continuous, so the multiple touch driving sub-electrodes 1031a in each vertical direction in the touch driving electrode unit 1031 are disconnected. For the electrical connection between multiple touch driving sub-electrodes 1031a, an additional signal connection line 104 is required to electrically connect multiple touch driving sub-electrodes 1031a in each vertical direction;

The signal connection line 104 must be arranged on a different layer from the common electrode layer, otherwise the touch sensing sub-electrode connected along the direction of the gate line will be short-circuited with the touch driving sub-electrode connected along the direction of the data line, that is, the touch sensing sub-electrode connected along the direction of the data line will be short-circuited. The touch sensing electrode unit 1032 will be short-circuited with the touch driving electrode unit 1031 . the

Fig. 4 is an equivalent diagram of the common electrode layer in Fig. 1; each horizontal line in Fig. 4 represents a horizontal array, each vertical line represents a longitudinal array, and 1032 _i-1 , 1032 _i and 1032 _i+1 represent three adjacent horizontal arrays, that is, touch sensing electrode unit arrays, where i=1, 2, 3, 4...; 1031 _j-1 , 1031 _j and 1031 _j+1 are three adjacent The longitudinal array of , that is, the touch drive electrode unit array, wherein, j=1, 2, 3, 4 . . . . Each of the horizontal arrays and each of the longitudinal arrays intersect respectively to form a plurality of intersection points. For example, the intersection point where the horizontal array 1032 _i intersects the vertical array 1031 _j is point B( _xi , y _j ).

In this liquid crystal display device, a detection unit is also provided, the detection unit provides the reference voltage value of the output terminal of each pixel unit, the detection unit sequentially scans each horizontal array row and vertical array, and detects each horizontal array row and vertical array row The actual voltage value is compared with the reference voltage value to determine whether it is touched. the

In the following, it will be specifically described by taking the determination of whether the point B is touched and how to determine the coordinates (x, y) of the point B as an example. the

After the detection unit scans and detects the horizontal array 1032i _-1 , then scans the horizontal array _1032i , sequentially detects the actual voltage value output by each point in the horizontal array _1032i , and compares it with the reference voltage value provided by the detection unit. If the detected actual voltage value is the same as the reference voltage value, it means that there is no touched point on the horizontal array 1032 _i ; if the detected actual voltage value is different from the reference voltage value, it means that _there is For the touched point, the vertical coordinate y of the touched point can be determined. At this time, the detection unit is scanning each longitudinal array in turn. After scanning and detecting the longitudinal array 1031 _j-1 , the detection unit then scans the longitudinal array 1031 _j and detects the actual output of each point in the longitudinal array 1031 _j . Voltage value, if the detected actual voltage value is the same as the reference voltage value, it means that there is no touched point on the vertical array; if the detected actual voltage value is different from the reference voltage value, it means that the vertical array 404 _j There is a touched point, and the abscissa x of the touched point can be determined; comprehensively considering the horizontal array and the vertical array, if there is a touched point on the horizontal array 1032i, and there is also a touched point on the vertical array _1031j , then according to The coordinates of the touched point B can be obtained as (x, y) by the corresponding ordinate y of the horizontal array 1032i and the corresponding abscissa x of the vertical _array 1031j.

Embodiment 2 of the present utility model provides another array substrate, and its top view is shown in FIG. 5. The difference from the array substrate shown in FIG. 1 is that in the array substrate shown in FIG. 1031a is directly connected along the direction of the gate line 101, and the touch sensing sub-electrode 1032b is bridge-connected along the direction of the data line 102, and the touch sensing sub-electrode 1032b is connected to the adjacent touch sensing sub-electrodes in the direction of the data line The electrodes are connected by bridging, and the signal connection line is arranged in the same direction as the data line. The working principle of the array substrate shown in FIG. 5 is the same as that of the array substrate shown in FIG. 1 . the

An array substrate provided by Embodiment 3 of the present utility model, its top view is shown in FIG. 6 . The difference from the array substrate shown in FIG. 1 is that in the array substrate shown in FIG. Directly connected along the direction of the data line 102, the touch sensing sub-electrode 1032b is bridged and connected along the direction of the gate line 101; wherein, the touch sensing sub-electrode 1032b is connected to the adjacent touch sensing sub-electrode in the row direction through the signal connection line 104 The sub-electrodes are bridge-connected, and the signal connection lines 104 are arranged in the same direction as the gate lines 101 . The working principle of the array substrate shown in FIG. 6 is the same as that of the array substrate shown in FIG. 1 . the

An array substrate provided by Embodiment 4 of the present utility model, its top view is shown in FIG. 7 . The difference from the array substrate shown in FIG. 1 is that in the array substrate shown in FIG. The touch sensing sub-electrode 1032b is directly connected along the direction of the data line 102; wherein, the touch driving sub-electrode 1031a is connected to the adjacent touch driving sub-electrode 1031a in the direction of the gate line through a signal connection line. The sub-electrodes are bridge-connected, and the signal connection lines 104 are arranged in the same direction as the gate lines 101 . The working principle of the array substrate shown in FIG. 7 is the same as that of the array substrate shown in FIG. 1 . the

The embodiment of the utility model provides a display device, the touch screen mentioned in the display device. the

When the signal connection line 104 on the touch screen is arranged in the same direction as the data line 102, the signal connection line 104 is arranged in the area corresponding to the blue pixel. Because human eyes have different sensitivities to colors and are not sensitive to blue recognition, so even if the component of blue pixels is relatively reduced, it will not affect the screen display. the

To sum up, the capacitive embedded touch screen and display device provided by the embodiment of the present utility model do not need additional sensing electrodes and touch electrodes, but the common electrode layer is improved, so that the improved common electrode can be An electric field is formed between the pixel electrode and the liquid crystal molecule to drive the movement; at the same time, the common electrode can form a coupling capacitance with the user at the touch point to determine whether the touch screen is touched; and, since the common electrode layer has a cross-arranged touch The sensing electrode unit array and the touch driving electrode unit array, the touch sensing electrode unit array is a horizontal array, the touch driving electrode unit array is a vertical array, and each horizontal touch sensing electrode unit array is scanned sequentially, and Each vertical touch drive electrode unit array is scanned sequentially to comprehensively obtain the specific position of the touched point. Since no additional touch sensing electrodes and touch driving electrodes are required, the display device provided by the embodiment of the present invention is lighter and thinner, and the control is more accurate and reliable. The utility model adopts a whole signal line to connect the touch driving electrode or the touch sensing electrode, so that the delay of the signal can be reduced and the speed of signal transmission can be improved. the

Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations. the

Claims (10)

1. A capacitance embedded touch screen comprises an array substrate, wherein the array substrate is provided with a grid line, a data line and a common electrode layer,

the common electrode layer comprises a plurality of mutually insulated touch driving electrode units and touch sensing electrode units;

the touch driving electrode unit comprises a plurality of touch driving sub-electrodes, the touch sensing electrode unit comprises a plurality of touch sensing sub-electrodes, one of the touch driving sub-electrodes and the touch sensing sub-electrodes is connected in a bridging mode along the direction of a data line, and the other sub-electrode is directly connected along the direction of a grid line; or one of the touch driving sub-electrode and the touch sensing sub-electrode is connected along the grid line direction in a bridging mode, and the other sub-electrode is directly connected along the data line direction.

2. The touch screen of claim 1, wherein the touch driving sub-electrodes are directly connected along a gate line direction, and when the touch sensing sub-electrodes are bridged along a data line direction, at least one gate line is used as a touch scanning line in a touch time period for applying a touch scanning signal to the touch driving electrode unit.

3. The touch screen of claim 1, further comprising a signal connection line, wherein the touch driving sub-electrodes are directly connected along a gate line direction, and when the touch sensing sub-electrodes are bridged along a data line direction, the touch sensing sub-electrodes are bridged with adjacent touch sensing sub-electrodes along the data line direction through the signal connection line, and the signal connection line is disposed in the same direction as the data line.

4. The touch screen of claim 1, further comprising signal connection lines, wherein the touch driving sub-electrodes are connected in a bridging manner along a data line direction, when the touch sensing sub-electrodes are directly connected along a gate line direction, the touch driving sub-electrodes are connected in a bridging manner with the touch driving sub-electrodes adjacent to the data line direction through the signal connection lines, and the signal connection lines are arranged in the same direction as the data lines.

5. The touch screen of claim 3 or 4, wherein the signal connection lines are disposed on the same layer as the data lines.

6. The touch screen of claim 1, further comprising a signal connection line, wherein the touch driving sub-electrodes are directly connected along a data line direction, and when the touch sensing sub-electrodes are bridged along a gate line direction, the touch sensing sub-electrodes are bridged with the touch sensing sub-electrodes adjacent to each other in the row direction by the signal connection line, and the signal connection line is disposed in the same direction as the gate line.

7. The touch screen of claim 1, further comprising signal connection lines, wherein the touch driving sub-electrodes are bridged along the gate line direction, and when the touch sensing sub-electrodes are directly connected along the data line direction, the touch driving sub-electrodes are bridged with the touch driving sub-electrodes adjacent to the gate line direction through the signal connection lines, and the signal connection lines are arranged in the same direction as the gate lines.

8. The touch screen of claim 6 or 7, wherein the signal connection lines are disposed on the same layer as the gate lines.

9. A display device comprising the touch panel according to any one of claims 1 to 8.

10. The display device according to claim 9, wherein the signal connection lines on the touch screen are disposed in regions corresponding to blue pixels when the signal connection lines are disposed in the same direction as the data lines.

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