WO2020248300A1

WO2020248300A1 - In-cell touch display panel and array substrate thereof

Info

Publication number: WO2020248300A1
Application number: PCT/CN2019/092514
Authority: WO
Inventors: 薛凯文; 邹恭华
Original assignee: 武汉华星光电技术有限公司
Priority date: 2019-06-10
Filing date: 2019-06-24
Publication date: 2020-12-17
Also published as: CN110262689B; CN110262689A

Abstract

The present invention relates to an in-cell touch display panel and an array substrate thereof. The array substrate of an in-cell touch display panel comprises: scan lines extending in a first direction; data lines extending in a second direction; touch wires extending in the second direction; and multiple touch electrodes distributed in an array and formed in a common electrode layer. A touch electrode distant from a touch detection chip side in the touch electrodes is connected to a corresponding channel of the touch detection chip by means of corresponding double touch wires; a touch electrode adjacent to the touch detection chip side in the touch electrodes is connected to a corresponding channel of the touch detection chip by means of a corresponding first touch wire; the first touch wire is formed by a single touch wire and a corresponding auxiliary connection wire. The present invention also provides a corresponding display panel. The in-cell touch display panel and the array substrate thereof provided by the present invention reduce the risk of appearing of vertical lines to a minimum, improve the variation value of touch electrodes, and reduce the difference of the touch electrodes.

Description

Embedded touch display panel and its array substrate

Technical field

The present invention relates to the field of display technology, in particular to an in-cell touch display panel and an array substrate thereof.

Background technique

With the rapid development of display technology, touch screen panels have gradually spread throughout people's lives. At present, touch screens can be divided into: Add on Mode Touch Panel (Add on Mode Touch Panel) and In Cell Touch Panel according to their composition structure. Among them, the plug-in touch screen is produced separately from the touch screen and the liquid crystal display (LCD), and then laminated together to become a touch-sensitive LCD display, which has higher production costs, lower light transmittance, and Shortcomings such as thicker modules. The in-cell touch screen embeds the touch electrodes of the touch screen inside the liquid crystal display, which can reduce the overall thickness of the module and greatly reduce the production cost of the touch screen, which is favored by major panel manufacturers.

The array substrate in the traditional in-cell touch display panel mainly includes a glass substrate and a first metal layer (M1), a first insulating layer, a second metal layer (M2), and a second insulating layer stacked on the glass substrate. Layer, common electrode layer, third insulating layer, third metal layer (M3), fourth insulating layer, etc. Wherein, the first metal layer forms multiple scan lines, the second metal layer forms multiple data lines, the common electrode layer forms multiple touch electrodes (sensor pads) distributed in an array, and the third metal layer forms multiple connection touch electrodes. The connection traces between the electrodes and the touch detection chip are used as touch traces. The touch electrodes are connected to the corresponding connection traces through the vias on the third insulating layer. Each touch electrode needs to pass through a corresponding touch trace Connect to the corresponding channel of the touch detection chip.

However, in the touch screen design of the LCD screen, when the resolution is constant (for example, 1080RGB*1920), for some touch screen design, the display of the LCD screen will have abnormal vertical lines. Take full high definition (FHD) 1080RGB*1920 resolution as an example, when the channel number of the touch screen is designed to be 18*32, if the design of double touch traces formed by the third layer of metal (M3) is adopted In the solution, each double touch trace includes two connection traces connected to the same touch electrode, and the two connection traces are connected in parallel to the same corresponding channel of the touch detection chip. The total number of connection wires connecting the touch electrodes and the touch detection chip is 64. Refer to FIG. 1, which is a schematic diagram of dual touch traces in the prior art. Each dual touch trace 1 includes two connection traces 2 connected to the corresponding same touch electrode. The two connection traces 2 Connect in parallel to the same corresponding channel of the touch detection chip. In this scheme, in order to avoid the conflict between the spacers (PS) and the connection trace 2 formed by the third metal layer (M3), a part of the spacers will be located in the RG sub-pixel (R sub-pixel 5 in Figure 1). Between the G sub-pixel and G sub-pixel 5), a part of the spacer will be located between the RB sub-pixel (B sub-pixel 10 and R sub-pixel 11 in Figure 1). Due to the filterability of the spacers to light of different wavelengths, it will cause The two types of pixels emit different lights, which form vertical vertical stripes (mura).

On the other hand, it is also possible to use a design solution of a single touch trace and a double touch trace. A single touch trace refers to a touch trace formed by a connection trace formed by a single third metal layer. The single connecting wire is connected to the corresponding touch electrode and connected to the corresponding channel of the touch detection chip. However, if a single touch trace and a double touch trace are mixed and matched to connect the touch electrode design, it will inevitably cause the difference between different touch electrodes and make the linear result of the touch screen worse. .

technical problem

Therefore, the object of the present invention is to provide an in-cell touch display panel and an array substrate thereof, and to design a new type of wiring method for touch screen touch wiring to reduce the risk of vertical stripes.

Technical solutions

In order to achieve the above objective, the present invention provides an array substrate of an in-cell touch display panel, including: a glass substrate, and a first metal layer, a second metal layer, a third metal layer, and a first metal layer stacked on the glass substrate. Common electrode layer; the first metal layer is formed with a plurality of scan lines extending in a first direction; the second metal layer is formed with a plurality of data lines extending in a second direction; the third metal layer is formed with a plurality of Touch traces extending along the second direction; the second direction and the first direction are perpendicular to each other; the common electrode layer forms a plurality of touch electrodes distributed in an array; the touch traces include a plurality of Double touch traces, the touch electrodes of the touch electrodes far away from the touch detection chip are connected to the corresponding channels of the touch detection chip through the corresponding double touch traces; The touch trace also includes a plurality of first touch traces, and the touch electrodes adjacent to the touch detection chip among the touch electrodes are connected to the touch control via corresponding first touch traces. Detect the corresponding channel of the chip; each first touch trace is formed by a single touch trace and the corresponding accessory connection trace, and the single touch trace and the corresponding accessory connection trace are electrically connected to The corresponding touch electrodes are connected in parallel, and the size of the auxiliary connection trace in the second direction is close to the size of the corresponding touch electrode in the second direction.

Wherein, a first insulating layer is provided between the first metal layer and the second metal layer; a second insulating layer is provided between the second metal layer and the third metal layer; and the third metal layer A third insulating layer is provided between the common electrode layer.

Wherein, the touch trace is connected to the touch sensing electrode through a via hole on the third insulating layer.

Wherein, the shape of the auxiliary connecting wire is substantially straight in the second direction.

Wherein, the size of the auxiliary connection trace in the second direction is slightly larger than the size of the corresponding touch electrode in the second direction, and the auxiliary connection trace does not correspond to the corresponding touch in the second direction. The adjacent touch electrodes overlap.

Wherein, the auxiliary connecting wire is connected to the corresponding single touch wire to form a rectangular opening.

Wherein, the size of the auxiliary connection trace in the first direction is much smaller than the size in the second direction.

Wherein, the size of the auxiliary connection trace in the first direction is smaller than the spacing between the touch traces.

The present invention also provides an in-cell touch display panel, including the array substrate of the in-cell touch display panel described in any one of the foregoing.

Beneficial effect

In summary, the in-cell touch display panel and the array substrate of the present invention reduce the risk of vertical stripes, at the same time improve the variation of touch electrodes, and reduce the variability of touch electrodes.

Description of the drawings

The technical solutions and other beneficial effects of the present invention will be made obvious by describing the specific embodiments of the present invention in detail below in conjunction with the accompanying drawings.

In the attached picture,

FIG. 1 is a schematic diagram of dual touch wires in the prior art;

FIG. 2 is a schematic diagram of a touch wiring design of a preferred embodiment of the in-cell touch display panel of the present invention.

Embodiments of the invention

The array substrate of the in-cell touch display panel of the present invention is designed with a new type of touch screen touch wiring method, which optimizes the design scheme of using single touch wiring and double touch wiring to mix and match. The key point is the routing method of the touch trace formed by the third layer of metal in the array substrate. The array substrate of the in-cell touch display panel of the present invention mainly includes: a glass substrate and a first metal layer, a second metal layer, a third metal layer and a common electrode layer laminated on the glass substrate; The metal layer is formed with a plurality of scan lines extending in the first direction; the second metal layer is formed with a plurality of data lines extending in the second direction; the third metal layer is formed with a plurality of contacts extending in the second direction The second direction and the first direction are perpendicular to each other; the common electrode layer forms a plurality of touch electrodes distributed in an array; each of the touch electrodes is electrically connected through a corresponding touch wire The corresponding channel to the touch detection chip; the touch trace includes a plurality of double touch traces, and the touch electrode on the side far from the touch detection chip of the touch electrode passes through the corresponding The two touch traces are connected to the corresponding channels of the touch detection chip; the touch traces also include a plurality of first touch traces, and the touch electrodes are adjacent to the touch detection The touch electrodes on the test chip side are connected to the corresponding channels of the touch detection chip via the corresponding first touch traces; each first touch trace is routed by a single touch trace and corresponding auxiliary connections The single touch trace and the corresponding auxiliary connection trace are respectively electrically connected to the corresponding touch electrode and then connected in parallel. The size of the auxiliary connection trace in the second direction is the same as that of the corresponding contact trace. The size of the control electrode in the second direction is close. A first insulating layer may be provided between the first metal layer and the second metal layer. A second insulating layer may be provided between the second metal layer and the third metal layer. A third insulating layer may be provided between the third metal layer and the common electrode layer. The touch trace may be connected to the touch sensing electrode through a via provided in the third insulating layer. It may further include a fourth insulating layer, a pixel electrode layer and other structures.

Refer to FIG. 2, which is a schematic diagram of the touch wiring design of a preferred embodiment of the in-cell touch display panel of the present invention. The common electrode layer forms a plurality of touch electrodes 40 distributed in an array; the touch electrodes 40 are electrically connected to the corresponding channels of the touch detection chip 10 through the corresponding touch traces; The control traces include common double touch traces 20, and the touch electrodes 40 on the side far away from the touch detection chip 10 of the touch electrodes 40 are connected to all of the touch electrodes 40 through corresponding double touch traces 20. The corresponding channels of the touch detection chip 10; the touch traces also include a plurality of first touch traces 30, and the touch electrodes on the side adjacent to the touch detection chip 10 of the touch electrodes pass through the corresponding first The touch trace 30 is connected to the corresponding channel of the touch detection chip; each first touch trace 30 is formed by a single touch trace 31 and a corresponding auxiliary connection trace 32, the single touch trace The trace 31 and the corresponding auxiliary connection trace 32 are respectively electrically connected to the corresponding touch electrode 40 and then connected in parallel. The size of the auxiliary connection trace 32 in the second direction is the same as that of the corresponding touch electrode 40. The size in the second direction is close.

In FIG. 2, the shape of the auxiliary connecting wire 32 is substantially straight in the second direction. The size of the auxiliary connecting wire 32 in the second direction may be slightly larger than the size of the corresponding touch electrode 40 in the second direction, and the auxiliary connecting wire 32 does not correspond to the upper and lower sides of the corresponding touch electrode 40 in the second direction. The adjacent touch electrodes 40 overlap. The auxiliary connecting wire 32 is connected to the corresponding single touch wire 31 to form a rectangular opening. The size of the auxiliary connecting wire 32 in the first direction is much smaller than the size in the second direction; the size of the auxiliary connecting wire 32 in the first direction is smaller than the spacing between the touch wires on the touch electrode 40. The design scheme of the present invention can avoid the following two situations at the same time: the formation of vertical vertical stripes are uneven in brightness and darkness, and the difference in the magnitude of variation between different touch electrodes is caused, and the linear result of the touch screen is deteriorated.

Taking full HD 1080RGB*1920 resolution as an example, when the number of channels of the touch screen is designed to be 18*32, each touch electrode 40 can correspond to 60 rows*60 columns of pixels, and the touch screen can be far away from the touch detection chip 10 side The 27 channels of the two use conventional double touch traces 20 as touch traces, and the five channels adjacent to the side of the touch detection chip 10 can use the first touch trace 30 shown in FIG. 2 The design scheme, in the touch electrode 40 shown in FIG. 2, even if the spacers are located between different sub-pixels, due to the extremely small number, they can be basically ignored in one frame of display, and the risk of vertical stripes is reduced. To the smallest. At the same time, the variation value of the touch electrode 40 on the side adjacent to the touch detection chip 10 is also the same as that of the touch electrode 40 connected to the conventional double touch trace 20.

According to the array substrate of the in-cell touch display panel of the present invention, the present invention also provides an in-cell touch display panel including the array substrate.

In summary, on the one hand, the present invention increases the flexibility of touch screen design for panels with different resolutions, and also improves the selectivity of touch screen solutions; on the other hand, it can improve the display effect of the screen, improve product quality and product brand competitiveness; Reducing the risk of vertical stripes to a minimum can greatly improve the difference value of the touch electrode and reduce the difference of the touch electrode.

As mentioned above, for those of ordinary skill in the art, various other corresponding changes and modifications can be made according to the technical solutions and technical ideas of the present invention, and all these changes and modifications shall belong to the appended claims of the present invention. The scope of protection.

Claims

An array substrate of an in-cell touch display panel, comprising: a glass substrate and a first metal layer, a second metal layer, a third metal layer, and a common electrode layer laminated on the glass substrate; the first metal The layer is formed with a plurality of scan lines extending in the first direction; the second metal layer is formed with a plurality of data lines extending in the second direction; the third metal layer is formed with a plurality of touch controls extending in the second direction The second direction and the first direction are perpendicular to each other; the common electrode layer forms a plurality of touch electrodes distributed in an array; the touch wiring includes a plurality of double touch wires, the Among the touch electrodes, the touch electrodes on the side far from the touch detection chip are connected to the corresponding channels of the touch detection chip through corresponding double touch wires; the touch wires also include a plurality of A first touch trace, the touch electrode adjacent to the touch detection chip among the touch electrodes is connected to a corresponding channel of the touch detection chip through a corresponding first touch trace; each The first touch trace is formed by a single touch trace and corresponding accessory connection traces, and the single touch trace and corresponding accessory connection traces are respectively electrically connected to the corresponding touch electrodes and then connected in parallel , The size of the auxiliary connection trace in the second direction is close to the size of the corresponding touch electrode in the second direction.
The array substrate of the in-cell touch display panel of claim 1, wherein a first insulating layer is provided between the first metal layer and the second metal layer; the second metal layer and the second metal layer A second insulating layer is arranged between the three metal layers; a third insulating layer is arranged between the third metal layer and the common electrode layer.
3. The array substrate of the in-cell touch display panel of claim 2, wherein the touch trace is connected to the touch sensing electrode through a via on the third insulating layer.
8. The array substrate of the in-cell touch display panel according to claim 1, wherein the shape of the auxiliary connection trace is substantially a straight line segment in the second direction.
The array substrate of the in-cell touch display panel of claim 1, wherein the size of the auxiliary connection trace in the second direction is slightly larger than the size of the corresponding touch electrode in the second direction, and The auxiliary connecting wire does not overlap with the touch electrode adjacent to the corresponding touch electrode in the second direction.
8. The array substrate of the in-cell touch display panel according to claim 1, wherein the auxiliary connecting wire is connected to a corresponding single touch wire to form a rectangular opening.
8. The array substrate of the in-cell touch display panel of claim 1, wherein the size of the auxiliary connection trace in the first direction is much smaller than the size in the second direction.
The array substrate of the in-cell touch display panel of claim 1, wherein the size of the auxiliary connection traces in the first direction is smaller than the spacing between the touch traces.
An in-cell touch display panel, comprising the array substrate of the in-cell touch display panel according to claim 1.