WO2020010756A1

WO2020010756A1 - Touch control display panel

Info

Publication number: WO2020010756A1
Application number: PCT/CN2018/113290
Authority: WO
Inventors: 郝思坤
Original assignee: 深圳市华星光电半导体显示技术有限公司
Priority date: 2018-07-12
Filing date: 2018-11-01
Publication date: 2020-01-16
Also published as: CN109189255A

Abstract

Disclosed is a touch control display panel. The touch control display panel comprises: a first substrate (10) and a second substrate (20) arranged opposite each other, and a liquid crystal layer (30) arranged between the first substrate and the second substrate, wherein the first substrate is an array substrate, and a touch control electrode (25) and a touch control sensing line (23) are formed on the second substrate; in a touch control stage, the touch control sensing line loads a touch control signal on the touch control electrode to perform touch control sensing; and in a display stage, the touch control sensing line loads a common voltage signal on the touch control electrode to perform picture display. By means of forming a touch control electrode of a self-capacitance structure on the second substrate to form an In-Cell touch control structure suitable for a VA-type liquid crystal display panel, the touch control sensitivity and working stability of the touch control display panel can be improved.

Description

Touch display panel

Technical field

The present invention relates to the field of display technology, and in particular, to a touch display panel.

Background technique

With the development of display technology, Liquid Crystal Display (LCD), Organic Light-Emitting Diode Display (Organic Light Display) Flat display devices such as Emitting Diode (OLED) are widely used in mobile phones, TVs, personal digital assistants, digital cameras, notebook computers, and desktop computers due to their high image quality, power saving, thin body, and wide range of applications. Various consumer electronic products have become the mainstream in display devices.

The touch panel provides a new human-computer interaction interface, which is more direct and user-friendly in use. The touch panel is integrated with the display panel of the flat display device to form a touch display panel, which can make the flat display device have a touch function, and can perform input through a finger, a stylus, etc., and the operation is more intuitive and simple.

Touch display panels can be divided into four types: resistive, capacitive, optical, and sonic according to different sensing technologies. The current mainstream touch technology is capacitive. According to different structures, the touch display panel can be divided into: an embedded touch display panel and an external touch display panel. Among them, the plug-in touch display panel is produced separately from the touch panel and the liquid crystal display panel, and then bonded together to form a touch-sensitive display panel. The plug-in touch display panel has high production cost and light transmittance. Lower, thicker modules, etc. Embedded touch display panel embeds the touch panel function into the LCD panel, so that the LCD panel has both the function of displaying and sensing touch input. Compared with the external touch display panel, it has a lower cost and a thinner thickness. And other advantages, favored by major panel manufacturers. Further, the embedded touch display panel is further divided into: according to the position of the touch circuit embedded in the liquid crystal panel: the touch circuit is on the liquid crystal cell (On Cell), the other is the touch circuit in the LCD cell type (In Cell). Compared with the On Cell touch display panel, the In Cell touch display panel can achieve thinner and lighter panels. It has been adopted by mobile phone manufacturers and has evolved into the main development direction of future touch technology.

technical problem

According to the orientation of the liquid crystal, the liquid crystal display panels on the mainstream market can be divided into the following types: Vertical alignment (Vertical Alignment (VA), Twisted Nematic (TN) or Super Twisted Nematic (STN), In-Plane Switching (IPS) type and fringe field switching (Fringe Field Switching (FFS) type. Existing In-Cell touch display panels generally use mutual-capacitive touch technology. Touch sensing requires both horizontal driving lines and vertical sensing lines. There are many line crossings and large parasitic capacitance. The aperture ratio of the pixel is low. At the same time, the horizontal driving line will increase the frame of the display and affect the realization of the narrow frame. The display panel used is generally an FFS liquid crystal display panel. Below the pixel electrode, the touch sensitivity is low, and it cannot be applied to a more widely used VA type liquid crystal display panel.

Technical solutions

An object of the present invention is to provide a touch display panel, which is suitable for a VA type liquid crystal display panel, and has high touch sensitivity and good work stability.

To achieve the above object, the present invention provides a touch display panel, including:

A first substrate and a second substrate opposite to each other, and a liquid crystal layer disposed between the first substrate and the second substrate;

The first substrate includes: a first base substrate; a TFT layer provided on a side of the first base substrate near the second substrate; a passivation layer provided on the TFT layer; and a passivation layer provided on the TFT layer. A pixel electrode on the passivation layer;

The second substrate includes: a second base substrate, a black matrix provided on a side of the second base substrate near the first substrate, and a plurality of contacts arranged on the black matrix at intervals. A control sensing line, an insulating layer provided on the touch sensing line, a black matrix and a second substrate, and a plurality of touch electrodes arranged in an array on the insulating layer and spaced from each other, the An insulating layer is formed with a plurality of via holes corresponding to the plurality of touch electrodes, and each touch electrode is electrically connected to one touch sensing line through a via hole; and

The touch display panel adopts a time-sharing driving mode. In a frame time, the working process is divided into a touch phase and a display phase. During the touch phase, the touch sensing line is loaded on the touch electrodes. The touch signal performs self-capacitive touch sensing. In the display stage, the touch sensing line loads a common voltage signal to the touch electrodes for screen display.

The present invention also provides a touch display panel, including:

The second substrate includes: a second base substrate, a black matrix provided on a side of the second base substrate near the first substrate, and a plurality of contacts arranged on the black matrix at intervals. A sensing line, an insulating layer provided on the touch sensing line, a black matrix and a second substrate, and a plurality of touch electrodes arranged in an array and spaced from each other on the insulating layer. The insulating layer is formed with a plurality of via holes corresponding to the plurality of touch electrodes, and each touch electrode is electrically connected to a touch sensing line through a via hole; and

Wherein during the touch phase, the touch sensing line loads a touch signal to the touch electrodes for touch sensing, and during the display phase, the touch sensing line loads a common voltage signal to the touch electrodes. Display the screen.

The second substrate further includes a color filter layer located between the second base substrate and the insulating layer. The color filter layer includes a plurality of color resist blocks arranged in an array, and adjacent color resists The blocks are separated by the black matrix.

The first substrate further includes a color filter layer located between the TFT layer and the passivation layer. The color filter layer includes a plurality of color resistance blocks arranged in an array, and the black matrix blocks each Area between adjacent color blocks

The second substrate further includes a planarization layer located on a side of the insulating layer away from the touch electrode and a side of the touch sensing line away from the touch electrode and covering a black matrix and a second substrate. .

The TFT layer includes a gate provided on the first substrate, a gate insulating layer provided on the gate and the first substrate, and an active layer provided on the gate insulating layer. A source electrode and a drain electrode provided on the gate insulating layer and in contact with both ends of the active layer, respectively.

Each of the plurality of touch sensing lines extends along a column direction in which the touch electrodes are arranged.

The shape of the touch electrode is rectangular or diamond.

The touch electrodes and the pixel electrodes are made of indium tin oxide.

The material of the touch sensing line is a combination of one or more of molybdenum, titanium, aluminum, and copper.

The material of the insulating layer is one or a combination of silicon oxide or silicon nitride.

Beneficial effect

Advantageous effects of the present invention: The present invention provides a touch display panel including a first substrate and a second substrate which are oppositely disposed, and a liquid crystal layer disposed between the first substrate and the second substrate. The substrate is an array substrate, and touch electrodes and touch sensing lines are formed on the second substrate. During the touch phase, the touch sensing lines load touch signals to the touch electrodes for touch sensing. In the display stage, the touch sensing line applies a common voltage signal to the touch electrodes for screen display, and a self-contained structure touch electrode is formed on the second substrate to form a suitable VA liquid crystal display panel. In-Cell touch structure can improve the touch sensitivity and working stability of the touch display panel.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings, but the drawings are provided for reference and explanation only, and are not intended to limit the present invention.

1 is a schematic diagram of a first embodiment of a touch display panel according to the present invention;

2 is a schematic diagram of a touch display panel according to a second embodiment of the present invention;

3 is a schematic diagram of a third embodiment of a touch display panel according to the present invention;

FIG. 4 is a distribution diagram of touch electrodes and touch sensing lines in the touch display panel of the present invention.

Embodiments of the invention

In order to further explain the technical means adopted by the present invention and its effects, the following describes in detail with reference to the preferred embodiments of the present invention and the accompanying drawings.

Please refer to FIG. 1 to FIG. 3. The present invention provides a touch display panel including: a first substrate 10 and a second substrate 20 opposite to each other and between the first substrate 10 and the second substrate 20.的 LCD 层 30。 The liquid crystal layer 30.

Specifically, the first substrate 10 is an array substrate, and includes: a first base substrate 11; a TFT layer 12 provided on a side of the first base substrate 11 near the second substrate 20; The passivation layer 13 on the TFT layer 12 and the pixel electrode 14 provided on the passivation layer 13;

As shown in FIG. 4, the second substrate 20 is an opposite substrate opposite to the array substrate. The second substrate 20 includes a second substrate 21, and a second substrate 20 disposed near the first substrate 10. A black matrix 22 on the side, a plurality of touch sensing lines 23 arranged at intervals on the black matrix 22, a plurality of touch sensing lines 23 arranged on the touch sensing lines 23, the black matrix 22, and the second substrate 21 An insulation layer 24 and a plurality of touch electrodes 25 arranged in an array and spaced from each other are arranged on the insulation layer 24. The insulation layer 24 is formed with a plurality of via holes 26 corresponding to the plurality of touch electrodes 25. A touch electrode 25 is electrically connected to a touch sensing line 23 through a via hole 26.

Specifically, the TFT layer 12 includes a gate 121 provided on the first base substrate 11, a gate insulating layer 122 provided on the gate 121 and the first base substrate 11, and An active layer 123 on the gate insulating layer 122, and a source 124 and a drain 125 provided on the gate insulating layer 123 and in contact with both ends of the active layer 123, respectively. Each of the plurality of touch sensing lines 23 extends along a row direction in which the touch electrodes 25 are arranged, and each row of the touch electrodes 25 is correspondingly provided with a plurality of touch sensing lines 23 parallel to the row of touch electrodes 25. .

Further, in order to improve the electrical characteristics of the TFT, the TFT layer 12 may further include an ohmic contact layer 127 between the source 124 and the active layer 123 and between the drain 125 and the active layer 123.

Preferably, the shape of the touch electrode 25 is rectangular or diamond.

Preferably, the materials of the touch electrodes 25 and the pixel electrodes 14 are both indium tin oxide, and the material of the touch sensing lines 23 is a combination of one or more of molybdenum, titanium, aluminum, and copper. The material of the insulating layer 24 is one or a combination of silicon oxide or silicon nitride.

It should be noted that the touch display panel is a VA type liquid crystal display panel, which uses a time-sharing driving mode to work. The working process includes two phases, namely a touch phase and a display phase. Within one frame time, The touch display panel first enters a touch phase. In the touch phase, the touch sensing line 23 loads a touch signal to the touch electrodes 25 for touch sensing, and then enters a display phase. In the display stage, the touch sensing line 23 applies a common voltage signal to the touch electrodes 25 for screen display.

It is worth mentioning that the present invention adopts a self-capacitive touch structure for touch control. The touch electrodes 25 only need to be provided with a vertical touch sensing line 23 to complete touch sensing, and a horizontal driving line is not required. The bezel of the liquid crystal display panel is reduced to realize a narrow bezel display. At the same time, the touch electrodes 25 and the touch sensing lines 23 are provided on the second substrate 20. The second substrate 20 is not an array substrate and has no TFT layer wiring structure. Reduce the crossover between the touch sensing line 23 and other traces in the plane, reduce parasitic capacitance, and improve work stability.

During specific implementation, as shown in FIG. 1, in a first embodiment of the present invention, the second substrate 20 is a color filter substrate, and the second substrate 20 further includes a second substrate 21 and a second substrate 20. The color filter layer 40 between the insulating layers 24 includes a plurality of color resist blocks arranged in an array, and adjacent color resist blocks are separated by the black matrix 22, preferably, The plurality of color resist blocks include a red color resist block, a green color resist block, and a blue color resist block.

In specific implementation, as shown in FIG. 2, in the second embodiment of the present invention, array color film integration (Color Filter on Array (COA) technology sets a color filter layer 40 ′ on the first substrate 10, that is, the first substrate 10 further includes a color filter located between the TFT layer 12 and the passivation layer 13. The light layer 40 ', the same color filter layer 40 includes a plurality of color resist blocks arranged in an array, and the black matrix 22 on the second substrate 20 correspondingly blocks the area between adjacent color resist blocks. Preferably, the plurality of color resist blocks include a red color resist block, a green color resist block, and a blue color resist block.

In specific implementation, as shown in FIG. 3, in a third embodiment of the present invention, a planarization layer 50 may be further added to the second substrate 20 on the basis of the second embodiment to planarize the second substrate. The unevenness on 20 ensures the working stability of the touch electrode 25. The planarization layer 50 is located on the side of the insulating layer 24 away from the touch electrode 25 and the touch sensing line 23 is far away from the touch. One side of the control electrode 25 covers the black matrix 22 and the second substrate 21.

In summary, the present invention provides a touch display panel including: a first substrate and a second substrate that are oppositely disposed, and a liquid crystal layer disposed between the first substrate and the second substrate, the first substrate It is an array substrate. Touch electrodes and touch sensing lines are formed on the second substrate. During the touch phase, the touch sensing lines load touch signals to the touch electrodes for touch sensing. In the display stage, the touch sensing line applies a common voltage signal to the touch electrodes for screen display. By forming a self-contained structure touch electrode on a second substrate, a touch panel suitable for a VA type liquid crystal display panel is formed. The In-Cell touch structure can improve the touch sensitivity and working stability of the touch display panel.

As mentioned above, for a person of ordinary skill in the art, various other corresponding changes and modifications can be made according to the technical solutions and technical concepts of the present invention, and all these changes and deformations should belong to the protection scope of the claims of the present invention .

Claims

A touch display panel includes:

A first substrate (10) and a second substrate (20) opposite to each other, and a liquid crystal layer (30) disposed between the first substrate (10) and the second substrate (20);

The first substrate (10) includes a first base substrate (11), and a TFT layer (12) provided on a side of the first base substrate (11) near the second substrate (20). A passivation layer (13) provided on the TFT layer (12) and a pixel electrode (14) provided on the passivation layer (13);

The second substrate (20) includes a second substrate (21), and a black matrix (22) provided on a side of the second substrate (21) near the first substrate (10). A plurality of touch sensing lines (23) arranged at intervals on the black matrix (22), arranged on the touch sensing lines (23), a black matrix (22) and a second substrate An insulation layer (24) on (21) and a plurality of touch electrodes (25) arranged in an array and spaced from each other on the insulation layer (24), the insulation layer (24) corresponding to the plurality of contacts The control electrode (25) is formed with a plurality of vias (26), and each touch electrode (25) is electrically connected to a touch sensing line (23) through a via (26); and

The touch display panel adopts a time-sharing driving mode. In a frame time, the working process is divided into a touch phase and a display phase. During the touch phase, the touch sensing line (23) faces the touch screen. The control electrode (25) loads a touch signal to perform self-capacitive touch sensing. In the display stage, the touch sensing line (23) loads a common voltage signal to the touch electrode (25) for screen display.
The touch display panel according to claim 1, wherein the second substrate (20) further comprises a color filter layer (between the second substrate substrate (21) and the insulating layer (24)) 40), the color filter layer (40) includes a plurality of color resist blocks arranged in an array, and adjacent color resist blocks are separated by the black matrix (22).
The touch display panel according to claim 1, wherein the first substrate (10) further comprises a color filter layer (40 ') located between the TFT layer (12) and the passivation layer (13). ), The color filter layer (40 ′) includes a plurality of color resistance blocks arranged in an array, and the black matrix (22) correspondingly blocks a region between each adjacent color resistance block.
The touch display panel according to claim 3, wherein the second substrate (20) further comprises a side of the insulating layer (24) away from the touch electrode (25) and the touch sensing line (23) A planarization layer (50) that is far from the touch electrode (25) and covers the black matrix (22) and the second substrate (21).
The touch display panel according to claim 1, wherein the TFT layer (12) comprises: a gate electrode (121) provided on the first substrate substrate (11), and a gate electrode (121) provided on the first substrate substrate (11). ) And the gate insulating layer (122) on the first base substrate (11), the active layer (123) provided on the gate insulating layer (122), and the gate insulating layer (123) A source electrode (124) and a drain electrode (125) respectively in contact with both ends of the active layer (123).
The touch display panel according to claim 1, wherein the plurality of touch sensing lines (23) each extend along a column direction in which the touch electrodes (25) are arranged.
The touch display panel according to claim 1, wherein a shape of the touch electrode (25) is rectangular or diamond.
The touch display panel according to claim 1, wherein the touch electrodes (25) and the pixel electrodes (14) are made of indium tin oxide.
The touch display panel according to claim 1, wherein a material of the touch sensing line (23) is a combination of one or more of molybdenum, titanium, aluminum, and copper.
The touch display panel according to claim 1, wherein a material of the insulating layer (24) is one or a combination of silicon oxide or silicon nitride.
A touch display panel includes:

A first substrate (10) and a second substrate (20) opposite to each other, and a liquid crystal layer (30) disposed between the first substrate (10) and the second substrate (20);

The first substrate (10) includes a first base substrate (11), and a TFT layer (12) provided on a side of the first base substrate (11) near the second substrate (20). A passivation layer (13) provided on the TFT layer (12) and a pixel electrode (14) provided on the passivation layer (13);

The second substrate (20) includes a second substrate (21), and a black matrix (22) provided on a side of the second substrate (21) near the first substrate (10). A plurality of touch sensing lines (23) arranged at intervals on the black matrix (22), arranged on the touch sensing lines (23), a black matrix (22) and a second substrate An insulation layer (24) on (21) and a plurality of touch electrodes (25) arranged in an array and spaced from each other on the insulation layer (24), the insulation layer (24) corresponding to the plurality of contacts The control electrode (25) is formed with a plurality of vias (26), and each touch electrode (25) is electrically connected to a touch sensing line (23) through a via (26); and

In the touch phase, the touch sensing line (23) loads a touch signal to the touch electrode (25) to perform touch sensing. During the display phase, the touch sensing line (23) is The touch electrode (25) is loaded with a common voltage signal for screen display.
The touch display panel according to claim 11, wherein the second substrate (20) further comprises a color filter layer (between the second substrate substrate (21) and the insulating layer (24)) 40), the color filter layer (40) includes a plurality of color resist blocks arranged in an array, and adjacent color resist blocks are separated by the black matrix (22).
The touch display panel according to claim 11, wherein the first substrate (10) further comprises a color filter layer (40 ') located between the TFT layer (12) and the passivation layer (13). ), The color filter layer (40 ′) includes a plurality of color resistance blocks arranged in an array, and the black matrix (22) correspondingly blocks a region between each adjacent color resistance block.
The touch display panel according to claim 13, wherein the second substrate (20) further comprises a side of the insulating layer (24) away from the touch electrode (25) and the touch sensing line (23) A planarization layer (50) that is far from the touch electrode (25) and covers the black matrix (22) and the second substrate (21).
The touch display panel according to claim 11, wherein the TFT layer (12) comprises: a gate (121) provided on the first substrate substrate (11), and a gate (121) provided ) And the gate insulating layer (122) on the first base substrate (11), the active layer (123) provided on the gate insulating layer (122), and the gate insulating layer (123) A source electrode (124) and a drain electrode (125) respectively in contact with both ends of the active layer (123).
The touch display panel according to claim 11, wherein the plurality of touch sensing lines (23) each extend in a column direction in which the touch electrodes (25) are arranged.
The touch display panel according to claim 11, wherein the shape of the touch electrode (25) is rectangular or diamond.
The touch display panel according to claim 11, wherein the touch electrodes (25) and the pixel electrodes (14) are made of indium tin oxide.
The touch display panel according to claim 11, wherein a material of the touch sensing line (23) is a combination of one or more of molybdenum, titanium, aluminum, and copper.
The touch display panel according to claim 11, wherein a material of the insulating layer (24) is one or a combination of silicon oxide or silicon nitride.