CN110580114B

CN110580114B - Embedded touch display panel

Info

Publication number: CN110580114B
Application number: CN201910910096.8A
Authority: CN
Inventors: 张耀光
Original assignee: Himax Technologies Ltd
Current assignee: Himax Technologies Ltd
Priority date: 2015-11-20
Filing date: 2015-11-20
Publication date: 2023-04-21
Anticipated expiration: 2035-11-20
Also published as: CN110580114A; CN106775037B; CN106775037A

Abstract

The invention describes an in-cell touch display panel, which comprises a plurality of touch driving electrodes and a plurality of touch sensing electrodes. The touch driving electrodes and the touch sensing electrodes are located in the display area of the embedded touch display panel and are arranged in a staggered mode. The plurality of touch driving electrodes are divided into a plurality of touch driving electrode groups, each of the plurality of touch driving electrode groups includes at least two of the plurality of touch driving electrodes, and the touch driving electrodes in each of the plurality of touch driving electrode groups are electrically connected to each other via connection wires in a peripheral region of the in-cell touch display panel that is located outside the display region.

Description

Embedded touch display panel

The application is a divisional application of Chinese invention patent application with the application number of 201510809263.1 and the application date of 2015, 11, 20 and the name of 'embedded touch display panel'.

Technical Field

The present invention relates to an in-cell touch display panel, and more particularly, to an in-cell touch display panel capable of improving voltage uniformity of a touch driving electrode during a display stage.

Background

With the progress of electronic product production technology, most handheld devices such as smart phones and tablet computers have been provided with touch operation functions, and the touch operation can facilitate the use of the handheld devices by users. Touch technologies currently developed for display devices include monolithic touch technology (one glass solution; OGS), surface-embedded touch technology (on-cell touch) and in-cell touch technology. Among these touch technologies, the in-cell touch technology is to make the touch electrode in the liquid crystal pixel layer of the display panel, so it has the advantage of making the thickness of the display panel thin and slim. However, for in-cell touch display panels, the display and touch sensing are performed in different time periods, which limits the time of the display phase and may cause the voltage of each pixel to be inconsistent.

Disclosure of Invention

The invention provides an embedded touch display panel, which is characterized in that a connecting wire in a peripheral area is arranged to improve the voltage uniformity of a touch driving electrode in a display stage. In addition, the connecting wires in the peripheral area can be formed by the same process as the circuit components in the display area, so that the whole process steps of the embedded touch display panel are not increased.

One mode of the present invention is to provide an in-cell (in-cell) touch display panel, which includes a plurality of touch driving electrodes and a plurality of touch sensing electrodes. The touch driving electrodes and the touch sensing electrodes are positioned in the display area of the embedded touch display panel and are arranged in a staggered manner. The touch driving electrodes are divided into a plurality of touch driving electrode groups, each of the touch driving electrode groups includes at least two of the touch driving electrodes, and the touch driving electrodes in each of the touch driving electrode groups are electrically connected to each other.

In one or more embodiments, the touch driving electrodes in each of the touch driving electrode groups are electrically connected to each other via connection wires in a peripheral region outside the display region.

In one or more embodiments, the touch driving electrodes in each of the touch driving electrode groups are symmetrically arranged at two sides of the virtual center axis of the display area.

In one or more embodiments, the in-cell touch display panel further includes a plurality of touch driving electrode leads. The touch driving electrode leads are respectively corresponding to and coupled to the touch driving electrodes, extend to the peripheral area, and are coupled to the connecting wires corresponding to the touch driving electrodes in each of the touch driving electrode groups.

Another mode of the present invention is to provide an in-cell touch display panel, which includes a plurality of touch driving electrodes and a plurality of touch sensing electrodes. The touch driving electrodes and the touch sensing electrodes are positioned in the display area of the embedded touch display panel and are arranged in a staggered manner. Both ends of each of the touch driving electrodes are coupled with connection wires such that both ends of each of the touch driving electrodes are electrically connected to each other via the connection wires.

In one or more embodiments, the in-cell touch display panel further includes a plurality of touch driving electrode leads. The touch driving electrode leads are respectively corresponding to and coupled to the touch driving electrodes, each of the touch driving electrode leads extends from two ends of the corresponding touch driving electrode to the peripheral area, and the touch driving electrode leads corresponding to each of the touch driving electrodes are coupled to the connecting wires.

Another mode of the present invention is to provide an in-cell touch display panel, which includes a plurality of touch driving electrodes and a plurality of touch sensing electrodes. The touch driving electrodes and the touch sensing electrodes are positioned in the display area of the embedded touch display panel and are arranged in a staggered manner. Both ends of each of the touch driving electrodes are respectively coupled to the first connection wire such that both ends of each of the touch driving electrodes are electrically connected to each other via the first connection wire. The touch driving electrodes are divided into a plurality of touch driving electrode groups, each of the touch driving electrode groups includes at least two of the touch driving electrodes, and the touch driving electrodes in each of the touch driving electrode groups are electrically connected to each other.

In one or more embodiments, the touch driving electrodes of each of the touch driving electrode groups are symmetrically arranged at two sides of the virtual center axis of the display area.

In one or more embodiments, the in-cell touch display panel further includes a plurality of touch driving electrode leads. The touch driving electrode leads are respectively corresponding to and coupled to the touch driving electrodes, each of the touch driving electrode leads extends to the peripheral area, and the touch driving electrode leads corresponding to each of the touch driving electrodes are coupled to the connecting wires.

Drawings

For a more complete understanding of the embodiments and advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic diagram depicting an in-cell touch display panel according to some embodiments of the invention;

FIG. 2 is a schematic diagram depicting an in-cell touch display panel according to some embodiments of the invention; and is also provided with

Fig. 3 is a schematic diagram depicting an in-cell touch display panel according to some embodiments of the invention.

Detailed Description

The contents of the present invention will be explained below by examples. However, these examples are not intended to limit the invention to any particular environment, application, or particular implementation described in these examples. Accordingly, these examples are described for illustrative purposes only and are not intended to limit the invention. In the following embodiments and drawings, components not directly related to the present invention are omitted and not depicted, and dimensional relationships between components in the drawings are merely for ease of understanding, not to limit to actual proportions.

It will be understood that, although the terms "first" and "second," etc. may be used herein to describe various components, parts, regions, layers and/or sections, these terms should not be limited to these components, parts, regions, layers and/or sections. These terms are only used to distinguish one element, component, region, layer and/or section from another element, component, region, layer and/or section.

Fig. 1 is a schematic diagram depicting an in-cell touch display panel 100 according to some embodiments of the invention. The in-cell touch display panel 100 has a display area AA and a peripheral area PA surrounding the display area AA and located outside the display area AA. The display area AA has touch driving electrodes TX (1) to TX (8) and touch sensing electrodes RX (1) to RX (10), wherein the touch driving electrodes TX (1) to TX (8) and the touch sensing electrodes RX (1) to RX (10) are arranged perpendicular to each other. The touch driving electrodes TX (1) to TX (8) and the touch sensing electrodes RX (1) to RX (10) may be composed of transparent conductive materials such as Indium Tin Oxide (ITO) or indium zinc oxide (indium zinc oxide; IZO) and the like, but are not limited thereto. The peripheral area PA has a driving circuit D electrically connected to the touch driving electrodes TX (1) to TX (8) and the touch sensing electrodes RX (1) to RX (10) to transmit the sensing signals to the touch driving electrodes TX (1) to TX (8) and simultaneously detect the touch sensing electrodes RX (1) to RX (10). When an object (e.g., a human finger, a stylus pen, etc.) is operated on the in-cell touch display panel 100, capacitance values between the touch driving electrodes TX (1) to TX (8) and the touch sensing electrodes RX (1) to RX (10) are changed. Detecting the change in capacitance between the touch driving electrodes TX (1) to TX (8) and the touch sensing electrodes RX (1) to RX (10) via the driving circuit D can determine the position of the object in the in-cell touch display panel 100.

In some embodiments, the driving circuit D provides a pixel driving function in addition to the touch driving function, which is used to drive each pixel (not shown) in the display area AA, so that the display area AA displays a corresponding image. Each pixel in the display area AA has a common electrode (not shown). In some embodiments, a portion of the common electrodes constitute touch driving electrodes TX (1) to TX (8), and another portion of the common electrodes constitutes touch sensing electrodes RX (1) to RX (10). For the in-cell touch display panel 100, each frame may be divided into a display phase and a touch sensing phase. In the display stage, the driving circuit D provides pixel voltages and common voltages to pixel electrodes (not shown) and common electrodes of each pixel to display a corresponding picture in the display area AA. In the touch sensing phase, the driving circuit D provides sensing signals to the touch driving electrodes TX (1) to TX (8) and simultaneously detects the touch sensing electrodes RX (1) to RX (10). How the driving circuit D operates in the display stage and the touch sensing stage is not an important point of the present invention, and will not be described here.

As shown in fig. 1, the virtual center line C divides the in-cell touch display panel 100 into two symmetrical regions, wherein one region includes touch driving electrodes TX (1) to TX (4) and touch sensing electrodes RX (1) to RX (5), and the other region includes touch driving electrodes TX (5) to TX (8) and touch sensing electrodes RX (6) to RX (10). Every two touch driving electrodes symmetrically arranged in the two areas form a touch driving electrode group, and the two groups are electrically connected with each other. That is, the touch driving electrode TX (1) and the touch driving electrode TX (8) form a touch driving electrode group P1, and the touch driving electrode TX (1) and the touch driving electrode TX (8) are electrically connected; the touch driving electrode TX (2) and the touch driving electrode TX (7) form a touch driving electrode group P2, and the touch driving electrode TX (2) and the touch driving electrode TX (7) are electrically connected; the touch driving electrode TX (3) and the touch driving electrode TX (6) form a touch driving electrode group P3, and the touch driving electrode TX (3) and the touch driving electrode TX (6) are electrically connected; the touch driving electrode TX (4) and the touch driving electrode TX (5) form a touch driving electrode group P4, and the touch driving electrode TX (4) and the touch driving electrode TX (5) are electrically connected.

In some embodiments, as shown in fig. 1, each of the touch driving electrodes TX (1) to TX (8) has a corresponding touch driving electrode lead L (1) to L (8). The touch driving electrode leads L (1) to L (8) are coupled to the touch driving electrodes TX (1) to TX (8), respectively, and the touch driving electrode leads L (1) to L (8) extend to the peripheral area PA. In the peripheral area PA, the touch driving electrode leads corresponding to all the touch driving electrodes of the same touch driving electrode group are coupled to the same connecting wire. As shown in fig. 1, there are four connection wires W1 (1) -W1 (4) in the peripheral area PA, wherein the touch driving electrode leads L (1) and L (8) are coupled to the connection wire W1 (1), the touch driving electrode leads L (2) and L (7) are coupled to the connection wire W1 (2), the touch driving electrode leads L (3) and L (6) are coupled to the connection wire W1 (3), and the touch driving electrode leads L (4) and L (5) are coupled to the connection wire W1 (4).

In the in-cell touch display panel 100, the touch driving electrode leads L (1) to L (8) and the connecting wires W1 (1) to W1 (4) may be made of conductive materials, which are the same as circuit components (not shown) in the display area AA, and the touch driving electrode leads L (1) to L (8) and the connecting wires W1 (1) to W1 (4) may be formed by the same process as the circuit components (not shown) in the display area AA. In addition, in some embodiments, the touch driving electrode leads L (1) to L (8) and the connecting wires W1 (1) to W1 (4) may be in direct contact (direct contact). For example, the touch driving electrode leads L (1) and L (8) can be in direct contact with the connecting wire W1 (1) through the vias.

In the embodiment of fig. 1, all the touch driving electrodes in the same touch driving electrode group can be electrically connected through the connecting wires disposed in the peripheral area PA. In this way, all the touch driving electrodes in the same touch driving electrode group can provide the same voltage value in the display stage, which is beneficial to the voltage homogenization of the touch driving electrodes in the display stage. In addition, all touch driving electrodes in the same touch driving electrode group are electrically connected with each other through connecting wires arranged in the peripheral area PA, and no additional components or circuits are arranged in the display area AA, so that the overall process and the light transmittance of the display area AA are not affected. Furthermore, the connecting wires disposed in the peripheral area PA can be formed by the same process as the circuit components (not shown) in the display area AA, so that the overall process steps of the in-cell touch display panel 100 are not increased.

It should be noted that the number of connection wires and the connection relation between the connection wires and the touch driving electrode leads L (1) to L (8) depicted in fig. 1 are only for illustration, and are not intended to limit the scope of the present invention. For example, in other embodiments, two connecting wires may be disposed in the peripheral region of the in-cell touch display panel 100, one of which is coupled to the touch driving electrode leads L (1), L (2), L (7) and L (8), and the other of which is coupled to the touch driving electrode leads L (3) to L (6). Thus, any embodiment derived from the disclosure of the invention falls within the scope of the invention.

Fig. 2 is a schematic diagram depicting an in-cell touch display panel 200 according to some embodiments of the invention. The in-cell touch display panel 200 has a display area AA and a peripheral area PA outside the display area AA and surrounding the display area AA. The display area is provided with touch driving electrodes TX (1) to TX (8) and touch sensing electrodes RX (1) to RX (10), wherein the touch driving electrodes TX (1) to TX (8) and the touch sensing electrodes RX (1) to RX (10) are arranged vertically. The peripheral area PA has a driving circuit D electrically connected to the touch driving electrodes TX (1) to TX (8) and the touch sensing electrodes RX (1) to RX (10) to transmit sensing signals to the touch driving electrodes TX (1) to TX (8) and simultaneously detect the touch sensing electrodes RX (1) to RX (10). The configuration of the touch driving electrodes TX (1) to TX (8), the touch sensing electrodes RX (1) to RX (10) and the driving circuit D in fig. 2 is the same as that in fig. 1, so the related description is referred to in the previous paragraph and is not repeated here.

In some embodiments, the driving circuit D provides a pixel driving function in addition to the touch driving function, which is used to drive each pixel (not shown) in the display area AA, so that the display area AA displays a corresponding image. Each pixel in the display area AA has a common electrode (not shown). In some embodiments, a portion of the common electrodes constitute touch driving electrodes TX (1) to TX (8), and another portion of the common electrodes constitute touch sensing electrodes RX (1) to RX (10).

As shown in fig. 2, each of the touch driving electrodes TX (1) to TX (8) has a corresponding touch driving electrode lead L (1) to L (8). The touch driving electrode leads L (1) to L (8) are respectively coupled to the touch driving electrodes TX (1) to TX (8), and the touch driving electrode leads L (1) to L (8) extend from both ends of the touch driving electrodes TX (1) to TX (8) to the peripheral area PA, respectively, wherein one ends of the touch driving electrode leads L (1) to L (8) are coupled to the driving circuit D. In the peripheral area PA, both ends of the same touch driving electrode are coupled to the same connecting wire. As shown in fig. 2, eight connecting wires W2 (1) to W2 (8) are respectively coupled to both ends of the corresponding touch driving electrode leads L (1) to L (8) in the peripheral area PA. That is, the connection wire W2 (i) is coupled to both ends of the touch driving electrode lead L (i).

In some embodiments, as shown in fig. 2, the virtual center line C divides the in-cell touch display panel 200 into two symmetrical regions, wherein one region includes the connecting wires W2 (1) to W2 (4) and the other region includes the connecting wires W2 (5) to W2 (8). In fig. 2, the connection wire W2 (1) and the connection wire W2 (8) are linearly symmetrical, the connection wire W2 (2) and the connection wire W2 (7) are linearly symmetrical, the connection wire W2 (3) and the connection wire W2 (6) are linearly symmetrical, and the connection wire W2 (4) and the connection wire W2 (5) are linearly symmetrical. In other embodiments, the connecting wires W2 (1) -W2 (8) may be located on the same side of the in-cell touch display panel 200.

In the in-cell touch display panel 200, the touch driving electrode leads L (1) to L (8) and the connecting wires W2 (1) to W2 (8) may be made of a conductive material that is the same as a circuit component (not shown) in the display area AA, and the touch driving electrode leads L (1) to L (8) and the connecting wires W1 (1) to W2 (8) may be formed through the same process as the circuit component (not shown) in the display area AA. In addition, in some embodiments, the touch driving electrode leads L (1) to L (8) and the connecting wires W2 (1) to W2 (8) may be in direct contact (direct contact). For example, two ends of the touch driving electrode lead L (1) can be directly contacted with the connecting wire W2 (1) through the via.

In the embodiment of fig. 2, through the connection wires disposed in the peripheral area PA, another electrical connection path between two ends of each touch driving electrode can be provided, and the impedance of one side of the touch driving electrode, which is far away from the driving circuit D, to the driving circuit D can be reduced. Therefore, all the common electrodes in the same touch driving electrode can easily reach the target voltage value in the display stage, and the common electrodes in the same touch driving electrode can provide the same voltage value in the display stage, which is beneficial to the voltage homogenization of the touch driving electrode in the display stage. In addition, the two ends of each touch driving electrode are electrically connected with each other through the connecting wires arranged in the peripheral area PA, and no additional components or circuits are arranged in the display area AA, so that the overall process and the light transmittance of the display area AA are not affected. Furthermore, the connecting wires disposed in the peripheral area PA can be formed by the same process as the circuit components (not shown) in the display area AA, so that the overall process steps of the in-cell touch display panel 200 are not increased.

In some embodiments, the in-cell touch display panel may have both the connection wires W1 (1) to W1 (4) shown in fig. 1 and the connection wires W2 (1) to W2 (8) shown in fig. 2. Referring to fig. 3, fig. 3 is a schematic diagram illustrating an in-cell touch display panel 300 according to some embodiments of the invention. Compared to the in-cell touch display panel 100 of fig. 1, the in-cell touch display panel 300 of fig. 3 further includes connecting wires W2 (1) to W2 (8) as shown in fig. 2. The configuration of the touch driving electrodes TX (1) to TX (8), the touch sensing electrodes RX (1) to RX (10), the driving circuit D and the connecting wires W1 (1) to W1 (4) in fig. 3 are the same as those in fig. 1, and the configuration of the connecting wires W2 (1) to W2 (8) is the same as that in fig. 2, so the related description will be omitted herein. In some embodiments, the connection wires W1 (1), W2 (1), and W2 (8) may form the same connection wire, the connection wires W1 (2), W2 (2), and W2 (7) may form the same connection wire, the connection wires W1 (3), W2 (3), and W2 (6) may form the same connection wire, and the connection wires W1 (4), W2 (4), and W2 (5) may form the same connection wire.

In the in-cell touch display panel 300, the touch driving electrode leads L (1) to L (8), the connection wires W1 (1) to W1 (4), and the connection wires W2 (1) to W2 (8) may be made of conductive materials identical to circuit components (not shown) in the display area AA, and the touch driving electrode leads L (1) to L (8), the connection wires W1 (1) to W1 (4), and the connection wires W2 (1) to W2 (8) may be formed through the same process as the circuit components (not shown) in the display area AA. In addition, in some embodiments, the touch driving electrode leads L (1) to L (8), the connecting wires W1 (1) to W1 (4), and the connecting wires W2 (1) to W2 (8) may be in direct contact (direct contact). For example, the touch driving electrode leads L (1) and L (8) may be in direct contact with the connecting wire W1 (1) through the via, and both ends of the touch driving electrode lead L (1) may be in direct contact with the connecting wire W2 (1) through the via.

It should be noted that, for convenience of explanation of technical features of the present invention, the drawings only take 8 touch driving electrodes and 10 touch sensing electrodes as examples. In practice, the in-cell touch display panel can be designed according to various requirements (such as size, resolution, light transmittance, etc.), but is not limited to the above embodiments.

While the present invention has been disclosed in the form of embodiments described above, it is not intended to limit the present invention, and various modifications and variations can be made by anyone skilled in the art without departing from the spirit and scope of the present invention, and therefore, the scope of the present invention should be determined by the appended claims.

Drawings

100. 200, 300 embedded touch display panel

AA display area

C virtual center axis

D driving circuit

L (1) -L (8) touch control driving electrode lead

P1-P4 touch control driving electrode group

PA peripheral region

RX (1) -RX (10) touch sensing electrode

TX (1) -TX (8) touch control driving electrode

Connection wires W1 (1) to W1 (4) and W2 (1) to W2 (10)

Claims

1. An embedded touch display panel comprises a plurality of touch driving electrodes and a plurality of touch sensing electrodes, wherein the touch driving electrodes and the touch sensing electrodes are positioned in a display area of the embedded touch display panel, and the touch driving electrodes and the touch sensing electrodes are staggered;

wherein the display area of the embedded touch display panel is divided into two symmetrical areas, each at least two touch driving electrodes of the plurality of touch driving electrodes are symmetrically arranged in the two areas to form a touch driving electrode group, and the two groups are electrically connected with each other,

wherein the touch driving electrodes in each of the plurality of touch driving electrode groups are electrically connected to each other via the same connecting wire in the peripheral region outside the display region.

2. The in-cell touch display panel of claim 1, wherein the touch driving electrodes of each of the plurality of touch driving electrode groups are symmetrically arranged on both sides of a virtual center axis of the display area.

3. The in-cell touch display panel of claim 1, further comprising a plurality of touch drive electrode leads respectively corresponding to and coupled to the plurality of touch drive electrodes, the plurality of touch drive electrode leads extending to the peripheral region and the plurality of touch drive electrode leads corresponding to touch drive electrodes in each of the plurality of touch drive electrode groups being coupled to the connection leads.