CN112684941B - Built-in touch display panel - Google Patents

Abstract

A built-in touch display panel comprises a substrate, a plurality of pixels, a plurality of touch electrodes, a plurality of common electrode strips and a plurality of touch wires. The substrate is provided with a plurality of touch sensing areas. The pixels, the touch electrodes and the common electrode strips are all positioned in the touch sensing areas. The touch electrodes in the same touch sensing area are separated from each other. The touch electrodes in one of the touch sensing regions and the touch electrodes in the other touch sensing region are electrically separated from each other. The common electrode bars are separated from each other and electrically connected to each other. The common electrode strips and the touch electrodes are electrically separated from each other. The touch electrodes in each touch sensing area are electrically connected with one of the touch wires.

Description

Built-in touch display panel

Technical Field

The invention relates to a display panel, and more particularly to a built-in touch display panel.

Background

Most of the current built-in touch display panels include a plurality of touch electrodes for sensing the position and movement of an object, such as a finger or a stylus, and many of the touch electrodes sense the position and movement of the object by capacitive sensing. Currently, each touch electrode included in a large-sized built-in touch display panel generally has a larger size, which results in an increase in parasitic capacitance. However, the design of the built-in touch display panel is difficult to effectively reduce the parasitic capacitance, so that the conventional built-in touch display panel, especially the built-in touch display panel with large-sized touch electrodes, generally has a low touch sensitivity.

Disclosure of Invention

At least one embodiment of the present invention provides a built-in touch display panel, which has a lower parasitic capacitance compared to the conventional general built-in touch display panel.

The built-in touch display panel provided by at least one embodiment of the invention comprises a substrate, a plurality of first signal lines, a plurality of second signal lines, a plurality of pixels, a plurality of touch electrodes, a plurality of common electrode strips and a plurality of touch wires. The first signal lines, the second signal lines, the pixels, the touch electrodes, the common electrode strips and the touch traces are all arranged on the substrate. The substrate is provided with a plurality of touch sensing areas. The extending direction of each first signal line is different from the extending direction of each second signal line. The pixels, the touch electrodes and the common electrode bars are all located in the touch sensing areas, wherein each pixel comprises at least one pixel electrode and at least one control element. The control element has a first end, a second end and a third end. The first end is connected with one of the first signal lines, the second end is connected with one of the second signal lines, and the third end is connected with one of the pixel electrodes. The touch electrodes in the same touch sensing area are separated from each other, and the touch electrodes in one touch sensing area are electrically separated from the touch electrodes in the other touch sensing area. The common electrode strips are separated from each other and are electrically connected with each other, and each common electrode strip and each touch electrode are electrically separated from each other. The touch-control wires pass through at least one part of the touch-control sensing areas, wherein the touch-control electrodes in each touch-control sensing area are electrically connected with one of the touch-control wires.

In at least one embodiment of the present invention, the touch electrodes and the common electrode bars are staggered in the same touch sensing area.

In at least one embodiment of the present invention, the touch electrodes and the common electrode bars extend in the same direction.

In at least one embodiment of the present invention, at least one common electrode strip passes through at least two touch sensing areas.

In at least one embodiment of the present invention, one of the touch traces passes through at least one of the touch electrodes.

In at least one embodiment of the present invention, one of the touch traces further passes through at least one common electrode strip.

In at least one embodiment of the present invention, the built-in touch display panel further includes connection electrodes disposed on the substrate and connected to the common electrode strips. In addition, the connecting electrodes and the touch control electrodes are electrically separated from each other.

In at least one embodiment of the present invention, the connection electrode is connected to at least one end of each common electrode strip.

In at least one embodiment of the present invention, the connecting electrode includes two conductive strips, and the extending direction of each conductive strip is different from the extending direction of the common electrode strips.

In at least one embodiment of the present invention, the built-in touch display panel further includes at least one insulating layer disposed between the touch traces and the touch electrodes, wherein the touch electrodes penetrate through the at least one insulating layer to connect the touch traces.

In at least one embodiment of the present invention, the adjacent touch electrodes and the common electrode bars are separated from each other on one of the first signal lines in the vertical projection substrate direction.

In at least one embodiment of the present invention, the touch electrodes in one of the touch sensing areas and the touch electrodes in the other touch sensing area are separated from each other on one of the second signal lines in a direction perpendicular to the projection substrate.

In at least one embodiment of the present invention, in the direction perpendicular to the projection substrate, at least one touch electrode overlaps at least one first signal line.

In at least one embodiment of the present invention, at least one of the common electrode stripes overlaps at least one of the first signal lines in a direction perpendicular to the projection substrate.

By using the design of the touch electrode and the common electrode line, the parasitic capacitance can be reduced. Compared with the conventional built-in touch display panel, the built-in touch display panel of at least one embodiment of the invention has lower parasitic capacitance, thereby having better touch sensitivity.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

Fig. 1A and 1B are schematic layout diagrams of a built-in touch display panel according to at least one embodiment of the invention.

FIG. 1C is a schematic cross-sectional view taken along line 1C-1C in FIG. 1B.

FIG. 1D is a schematic cross-sectional view taken along line 1D-1D in FIG. 1B.

Fig. 1E is a schematic wiring diagram of the touch electrode, the common electrode bar and the touch trace in fig. 1B.

Fig. 1F is a schematic layout diagram of the built-in touch display panel in fig. 1E in the area A2.

Fig. 2 is a schematic layout diagram of a built-in touch display panel according to another embodiment of the invention.

Fig. 3 is a schematic layout diagram of a built-in touch display panel according to another embodiment of the invention.

Wherein, the reference numbers:

100. 200 and 300: built-in touch display panel

111: first signal line

112: second signal line

120: pixel

121: pixel electrode

121s: slit

122: control element

122c: channel layer

122d: third terminal

122g: first end

122s: second end

131: touch wiring

132. 232: touch electrode

133. 134, 141, 142: opening of the container

140. 340, and (3): common electrode strip

150: connecting electrode

151: conductive strip

160. 161, 162, 163: insulating layer

170: display medium

180: opposite substrate

181: bearing plate

182: black matrix

183: filter layer

190: substrate board

191: touch sensing area

A1, A2: region(s)

D1: a first direction

D2: the second direction

G12: gap between the two plates

H13, H23, H33: width of

N1: normal line

V1, V2: contact hole

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

in the following description, the dimensions (e.g., length, width, thickness, and depth) of elements (e.g., layers, films, substrates, regions, etc.) in the figures are exaggerated in various proportions for the sake of clarity. Accordingly, the following description and illustrations of the embodiments are not limited to the sizes and shapes of elements shown in the drawings, but are intended to cover deviations in sizes, shapes and both that result from actual manufacturing processes and/or tolerances. For example, the planar surfaces shown in the figures may have rough and/or non-linear features, while the acute angles shown in the figures may be rounded. Accordingly, the drawings are intended to depict only typical embodiments of the invention, and therefore should not be considered as limiting the scope of the invention.

Furthermore, the terms "about", "approximately" or "substantially" as used herein encompass not only the explicitly recited values and ranges of values, but also the allowable range of deviation as understood by those of ordinary skill in the art, wherein the range of deviation can be determined by the error in measurement, for example, due to limitations of both the measurement system and the process conditions. Moreover, "about" can mean within one or more standard deviations of the above-recited values, e.g., within ± 30%, 20%, 10%, or 5%. The terms "about," "approximately," or "substantially," as used herein, may be selected with an acceptable range of deviation or standard deviation based on optical, etching, mechanical, or other properties, and not all such properties may be applied with one standard deviation alone.

Fig. 1A is a wiring diagram of a built-in touch display panel according to at least one embodiment of the invention. Referring to fig. 1A, the built-in touch display panel 100 includes a plurality of first signal lines 111, a plurality of second signal lines 112 and a plurality of touch traces 131 (only one is shown in fig. 1A), wherein the first signal lines 111 may extend along a first direction D1, and the second signal lines 112 and the touch traces 131 may extend along a second direction D2.

The first direction D1 is different from the second direction D2. Taking fig. 1A as an example, the first direction D1 may be substantially perpendicular to the second direction D2, so that the extending direction of each of the second signal lines 112 is substantially the same as the extending direction of each of the touch traces 131, but the extending direction of each of the first signal lines 111 is significantly different from the extending direction of each of the second signal lines 112 and each of the touch traces 131.

In the embodiment shown in fig. 1A, each of the first signal lines 111 may be a scan line (scan line) of the on-board touch display panel 100, and each of the second signal lines 112 may be a data line (data line) of the on-board touch display panel 100. However, in other embodiments, each of the first signal lines 111 may also be a data line, and each of the second signal lines 112 may also be a scan line, so the functions, structures and extending directions of the first signal lines 111 and the second signal lines 112 are not limited to fig. 1A.

Since the extending direction of each first signal line 111 is significantly different from the extending direction of each second signal line 112 and each touch trace 131, both the second signal lines 112 and the touch trace 131 are interlaced with the first signal lines 111, wherein the first signal lines 111 and the second signal lines 112 can be arranged in a mesh form because of being interlaced with each other to form a plurality of grids (not shown). In addition, at least one touch trace 131 can be adjacent to one of the second signal lines 112. For example, each touch trace 131 can be adjacent to one of the second signal lines 112.

The built-in touch display panel 100 further includes a plurality of pixels 120, wherein the pixels 120 may be respectively located in the grids. Taking fig. 1A as an example, each grid may be surrounded by two adjacent first signal lines 111 and two adjacent second signal lines 112, and one pixel 120 may be located in each grid. In other words, the pixels 120 may be arranged in the grids one-to-one, and are surrounded by two adjacent first signal lines 111 and two adjacent second signal lines 112, as shown in fig. 1A. Further, in the embodiment shown in fig. 1A, each pixel 120 may be a sub-pixel. However, in other embodiments, each pixel 120 may be a main pixel (main pixel) having a plurality of sub-pixels, so that the pixels 120 are not limited to the sub-pixels shown in fig. 1A.

Each pixel 120 includes at least one pixel electrode 121 and at least one control element 122, wherein each pixel electrode 121 may have a plurality of parallel slits 121s, and each slit 121s may extend substantially along the second direction D2. The pixel electrode 121 may be a transparent conductive layer, which may be made of a transparent metal Oxide, such as Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO).

In the embodiment shown in fig. 1A, since the pixels 120 may be sub-pixels, each pixel 120 may include a single pixel electrode 121 and a single control element 122. However, in other embodiments, each pixel 120 may include a plurality of pixel electrodes 121 and a plurality of control elements 122 on the premise that each pixel 120 is a main pixel. It should be noted that, even if the pixel 120 is a sub-pixel, the pixel 120 may include at least two control elements 122 and at least two pixel electrodes 121, and therefore the number of the pixel electrodes 121 and the control elements 122 included in each pixel 120 is not limited to fig. 1A.

The control element 122 may have a plurality of signal terminals for electrically connecting signal lines (e.g., the first signal line 111 and the second signal line 112) or other elements (e.g., the pixel electrode 121). For example, the control element 122 in FIG. 1A may have three signal terminals: a first end 122g, a second end 122s and a third end 122d. In the embodiment shown in fig. 1A, the control device 122 may be a Field-Effect Transistor (FET) and has a gate (gate), a drain (drain), a source (source), and a channel layer 122c, wherein the first end 122g is the gate, the second end 122s is the source, and the third end 122d is the drain.

FIG. 1B is a schematic layout diagram of the built-in touch display panel shown in FIG. 1A, FIG. 1C is a schematic cross-sectional diagram taken along the line 1C-1C in FIG. 1B, and FIG. 1D is a schematic cross-sectional diagram taken along the line 1D-1D in FIG. 1B. Fig. 1B is similar to fig. 1A, but different from fig. 1A, fig. 1B shows the touch electrodes 132 and the common electrode bars 140 that are not shown in fig. 1A, wherein the touch electrodes 132 and the common electrode bars 140 shown in fig. 1B are all presented in a dot pattern. In addition, in fig. 1B, the text (i.e. the cross-sectional lines "1C" and "1D") appearing in both the touch electrode 132 and the common electrode bar 140 is displayed in a blank pattern in a small area around the text, and a dot pattern is not displayed.

Referring to fig. 1B to fig. 1D, the built-in touch display panel 100 further includes a plurality of touch electrodes 132 (only one is shown in fig. 1B and fig. 1C), a plurality of common electrode bars 140 (only one is shown in fig. 1B and fig. 1D), and a substrate 190. The substrate 190 is a transparent substrate such as a glass plate or a transparent plastic plate, wherein the touch electrodes 132 are disposed on the substrate 190 (as shown in fig. 1C), and the common electrode strips 140 are also disposed on the substrate 190 (as shown in fig. 1D). Both the touch electrodes 132 and the common electrode bars 140 may be transparent conductive layers made of transparent metal oxide, such as Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO).

The first signal lines 111, the second signal lines 112 and the pixels 120 are disposed on the substrate 190, wherein each pixel 120 is electrically connected to the first signal line 111, the second signal line 112 and the pixel electrode 121. The first end 122g (i.e., the gate) of the control element 122 and the first signal lines 111 may be formed on the substrate 190, wherein the first end 122g is connected to one of the first signal lines 111. The first ends 122g of the control elements 122 and the first signal lines 111 may be formed by etching the same layer, such as a metal layer. Therefore, the first end 122g and the first signal line 111 are formed on the same surface of the substrate 190.

The built-in touch display panel 100 may further include insulating layers 160, 161, 162, and 163, wherein the insulating layer 160 covers the first end 122g and the first signal line 111. The second signal line 112, the touch trace 131, the channel layer 122c of the control device 122, the second end 122s and the third end 122d are all located on the insulating layer 160, wherein both the second end 122s and the third end 122d partially cover the channel layer 122c, and the second end 122s is connected to one of the second signal lines 112. The channel layer 122c is a semiconductor layer and electrically connects the second terminal 122s and the third terminal 122d. In addition, the second end 122s, the third end 122d, the touch trace 131 and the second signal line 112 may be formed by etching the same metal layer.

The insulating layer 161 covers the second signal line 112, the channel layer 122c, the second end 122s and the third end 122d. An insulating layer 162 is formed on the insulating layer 161, and an insulating layer 163 is formed on the insulating layer 162. The touch electrode 132 is formed on the insulating layer 162 and covered by the insulating layer 163, as shown in fig. 1C. Similarly, the common electrode bar 140 is also formed on the insulating layer 162 and covered by the insulating layer 163, as shown in fig. 1D. Therefore, the insulating layers 161 and 162 are disposed between the touch traces 131 and the touch electrodes 132, and between the touch traces 131 and the common electrode bars 140.

In other embodiments, the insulating layers 161 and 162 can be replaced by a single insulating layer, i.e., the insulating layers 161 and 162 can be integrated into a single insulating layer. Therefore, at least one insulating layer may be disposed between the touch trace 131 and the touch electrode 132, and is not limited to the insulating layers 161 and 162 in fig. 1C and 1D. In addition, the touch electrodes 132 and the common electrode bars 140 may be formed by etching a same transparent conductive layer, such as Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO).

Each pixel electrode 121 is formed on the insulating layer 163 and is overlapped with the touch electrode 132 or the common electrode bar 140, so that the insulating layer 163 is disposed between the pixel electrode 121 and the touch electrodes 132. The insulating layers 161, 162, and 163 have a plurality of contact holes V1 therein, wherein each of the contact holes V1 may be formed through the insulating layers 161, 162, and 163. In other words, the contact hole V1 may extend from the top surface of the insulating layer 163 to the bottom surface of the insulating layer 161 via the insulating layer 162.

The contact holes V1 correspond to the third terminals 122d, respectively, so that a portion of the third terminal 122d located at the bottom of the contact hole V1 is not covered by the insulating layers 161, 162 and 163. In this way, the pixel electrode 121 can extend from the insulating layer 163 to the third end 122d located at the bottom of the contact hole V1, so that the third end 122d of the control element 122 can be connected to one of the pixel electrodes 121, thereby electrically connecting and controlling the pixel electrodes 121.

In addition, the insulating layers 161 and 162 may have a plurality of contact holes V2 (one is shown in fig. 1B and 1C). Each contact hole V2 may be formed through the insulating layers 161 and 162, that is, the contact hole V2 may extend from the top surface of the insulating layer 162 to the bottom surface of the insulating layer 161. From fig. 1C, the depth of the contact hole V2 is significantly smaller than the depth of the contact hole V1. The contact holes V2 respectively correspond to the touch traces 131, so that a portion of the touch trace 131 located at the bottom of the contact hole V2 is not covered by the insulating layers 161 and 162.

Therefore, the touch electrodes 132 can extend from the insulating layer 162 to the touch traces 131 located at the bottom of the contact hole V2, so that the touch electrodes 132 can penetrate through the insulating layers 161 and 162 to connect the touch traces 131. Thus, the touch electrodes 132 can be electrically connected to the touch traces 131 disposed on the substrate 190. In addition, these contact holes V2 may be filled with the insulating layer 163, as shown in fig. 1C.

Each touch electrode 132 may have a plurality of openings 133 (only one is shown in fig. 1B), and each common electrode bar 140 may have a plurality of openings 141 (only one is shown in fig. 1B), wherein the openings 133 and 141 respectively correspond to the touch traces 131. In detail, each of the openings 133 or 141 is formed right above one of the touch traces 131 and extends along the touch trace 131, so the shapes of the openings 133 and 141 are both strip-shaped and correspond to the shape of the touch trace 131. The openings 133 and 141 can reduce the overlapping area between the touch electrodes 132 and the common electrode strips 140 and the touch traces 131, so as to reduce the parasitic capacitance generated between the touch electrodes 132 and the common electrode strips 140 and the touch traces 131, and improve the touch sensitivity of the built-in touch display panel 100.

In addition, each touch electrode 132 may further have a plurality of openings 134, and each common electrode bar 140 may further have a plurality of openings 142, wherein the openings 134 and 142 respectively correspond to the contact holes V1. Specifically, contact hole V1 is located within opening 134 or 142, wherein the respective sidewalls of openings 134 and 142 surround contact hole V1, i.e., the respective apertures of both openings 134 and 142 are larger than the aperture of contact hole V1. Therefore, neither the touch electrode 132 nor the common electrode bar 140 contacts the pixel electrode 121 in the contact hole V1, so as to prevent a short circuit between the pixel electrode 121 and both the touch electrode 132 and the common electrode bar 140.

Referring to fig. 1C and fig. 1D, the built-in touch display panel 100 may further include an opposite substrate 180 and a display medium 170, wherein fig. 1A and fig. 1B show the built-in touch display panel 100 under the condition that the opposite substrate 180 and the display medium 170 are omitted. The opposite substrate 180 is disposed opposite to the substrate 190, and the display medium 170 is disposed between the opposite substrate 180 and the substrate 190. The display medium 170 may be a liquid crystal material, and the built-in touch display panel 100 may be a liquid crystal display panel.

For example, the built-In touch display panel 100 In the present embodiment may be a Fringe Field Switching (FFS) liquid crystal display panel, and the built-In touch display panel 100 In other embodiments may be an In-Plane-Switching (IPS) liquid crystal display panel. In addition, the pixel 120 in this embodiment may have a structure in which the pixel is on a common electrode (common on electrode), but in other embodiments, the pixel 120 may also have a structure in which the pixel is on a common electrode (common on electrode).

The opposite substrate 180 includes a carrier 181, a black matrix 182, and a plurality of filter layers 183. The black matrix 182 and the filter layers 183 are disposed on the carrier 181, wherein the black matrix 182 is mesh-shaped, and the black matrix 182 has a plurality of openings. The filter layers 183 are respectively located in the openings of the black matrix 182, and the black matrix 182 can cover the control device 122, the first signal lines 111, the second signal lines 112, and the touch traces 131.

The filter layers 183 respectively correspond to the pixel electrodes 121, so that the light passing through the pixel electrodes 121 can be incident on the filter layers 183. The colors of these filter layers 183 are not the same. For example, the filter layers 183 may include a plurality of red filter layers, a plurality of green filter layers, and a plurality of blue filter layers, so that the filter layers 183 can filter the light emitted from the pixel electrodes 121 into red light, filtered light, and blue light, thereby facilitating the formation of images.

Referring to fig. 1B to 1D, the common electrode bar 140 and the touch electrode 132 can output a common voltage, and the second signal line 112 can output a pixel voltage to the corresponding pixel electrode 121 through the control element 122. The common voltage is generally different from the pixel voltage, and thus an electric field can be generated between the pixel electrode 121 and the common electrode bar 140. Since the pixel electrode 121 has a plurality of slits 121s arranged in parallel, an electric field having a horizontal component can be generated between the pixel electrode 121 and the common electrode bar 140. When the display medium 170 is a liquid crystal material, the electric field with horizontal component can drive the liquid crystal molecules in the liquid crystal material (the display medium 170) to deflect, so that the built-in touch display panel 100 can display images.

In addition, fig. 1A and 1B are shown by viewing the built-in touch display panel 100 along a direction substantially parallel to the normal N1 of the substrate 190, so that the built-in touch display panel 100 shown in fig. 1A and 1B is shown by viewing the built-in touch display panel 100 along a direction perpendicular to the projection substrate 190. As shown in fig. 1B, the adjacent touch electrodes 132 and the common electrode bar 140 are separated from each other on one of the first signal lines 111 in the direction of the vertical projection substrate 190.

In other words, a gap (not labeled) exists between the adjacent touch electrodes 132 and the common electrode bar 140, and the gap is formed above one of the first signal lines 111, i.e. the gap can be aligned with the first signal line 111. The gap enables the touch electrodes 132 and the common electrode strips 140 to be electrically separated without being connected or touched, so as to prevent short circuit between the touch electrodes 132 and the common electrode strips 140, thereby maintaining or improving the touch function of the built-in touch display panel 100.

Fig. 1E is a schematic wiring diagram of the touch electrode, the common electrode bar and the touch trace in fig. 1B, wherein fig. 1B is a schematic wiring diagram in the area A1 in fig. 1E. Referring to fig. 1B and fig. 1E, the substrate 190 has a plurality of touch sensing areas 191, wherein fig. 1B shows the touch sensing areas 191 by dotted lines. The touch sensing areas 191 may be arranged in an array, and the pixels 120 and the touch electrodes 132 are located in the touch sensing areas 191. Each touch sensing area 191 has a larger area, so a plurality of touch electrodes 132 can be located in one touch sensing area 191. That is, a plurality of touch electrodes 132 may be disposed in each touch sensing area 191. In addition, the touch electrodes 132 in the same touch sensing region 191 are separated from each other.

Taking fig. 1E as an example, four touch electrodes 132 may be located in the same touch sensing area 191, wherein the four touch electrodes 132 are separated from each other and may be connected to the same touch trace 131. In other words, the touch electrodes 132 in each touch sensing area 191 are electrically connected to the same touch trace 131, so the touch electrodes 132 in the same touch sensing area 191 can be electrically connected to each other and can be at the same potential. The area of each touch sensing area 191 is larger than the size of each pixel 120, so that a plurality of pixels 120 can be located in the same touch sensing area 191. For example, 30 × 30 pixels 120 may be located in the same touch sensing region 191, wherein the pixels 120 may be primary pixels or secondary pixels.

The touch electrodes 132 are strip-shaped, and the extending directions of the touch electrodes 132 and the common electrode strips 140 are substantially the same. For example, the touch electrodes 132 and the common electrode bars 140 extend along the first direction D1. Second, the at least one common electrode strip 140 may pass through the at least two touch sensing areas 191. Taking fig. 1E as an example, each common electrode strip 140 may pass through more than two touch sensing regions 191.

It should be noted that, under the condition that the built-in touch display panel 100 is a Fringe Field Switching (FFS) liquid crystal display panel or a lateral field switching (IPS) liquid crystal display panel, the touch electrodes 132 and the common electrode bars 140 extending along the first direction D1 in fig. 1E can generate an electric field affecting the deflection of liquid crystal molecules, which can help reduce the occurrence of light leakage and improve the image quality.

The extending direction of the touch trace 131 is different from the extending direction of the touch electrode 132 and the common electrode bar 140. For example, each touch trace 131 extends along the second direction D2. The touch traces 131 are interleaved with the touch electrodes 132 and the common electrode bars 140. Taking fig. 1E as an example, one of the touch traces 131 not only passes through at least one touch electrode 132, but also passes through at least one common electrode strip 140.

The touch traces 131 pass through at least a portion of the touch sensing areas 191. In the embodiment shown in fig. 1E, the shortest touch trace 131 passes through a portion of the lowermost touch sensing region 191, but does not pass through the entire touch sensing region 191, and the longest touch trace 131 passes through a plurality of the entire touch sensing regions 191. Therefore, each touch trace 131 passes through at least one complete touch sensing area 191, or only passes through a portion of one of the touch sensing areas 191, but does not pass through the complete touch sensing area 191.

The common electrode bars 140 are located in the touch sensing areas 191, wherein the common electrode bars 140 are separated from each other, and in the same touch sensing area 191, the touch electrodes 132 and the common electrode bars 140 may be arranged in a staggered manner. Therefore, the touch electrodes 132 in the same touch sensing area 191 do not occupy the entire touch sensing area 191.

Each common electrode bar 140 is electrically separated from each touch electrode 132. Taking fig. 1B as an example, a gap (not shown) exists between the adjacent touch electrodes 132 and the common electrode bar 140, wherein the gap is adjacent to the openings 142 and is communicated with the openings 142.

The gaps enable the touch electrodes 132 and the common electrode strips 140 to be electrically separated without being connected or touched, so as to prevent short circuit between the touch electrodes 132 and the common electrode strips 140. In addition, each touch trace 131 is not electrically connected to any common electrode strip 140, that is, the touch trace 131 and the common electrode strip 140 are also electrically separated from each other. Therefore, the touch electrode 132 has a touch sensing function, but the common electrode bar 140 has no touch sensing function.

When the built-in touch display panel 100 performs touch sensing, the second signal lines 112 temporarily suspend outputting the pixel voltage, and the touch electrodes 132 also temporarily suspend outputting the common voltage, so that the touch electrodes 132 can perform touch sensing. When an object (e.g., a finger or a stylus) contacts the built-in touch display panel 100, the touch electrodes 132 performing touch sensing can detect the position and movement of the object. Thus, the user can use the object to touch and operate the built-in touch display panel 100.

The common electrode bars 140 are electrically connected to each other. Specifically, the built-in touch display panel 100 may further include a connection electrode 150, wherein the connection electrode 150 is connected to the common electrode bars 140, so that the common electrode bars 140 can be electrically connected to each other. In the embodiment shown in fig. 1E, the connecting electrode 150 comprises two conductive strips 151, wherein the extending direction of each conductive strip 151 is different from the extending direction of the common electrode strips 140. For example, each conductive strip 151 extends along the second direction D2.

The conductive strips 151 are respectively connected to two ends of each common electrode strip 140, so that the connecting electrode 150 and the common electrode strips 140 can form a fence-like common electrode, and the common electrode strips 140 can also be electrically connected to each other. Furthermore, in other embodiments, the connection electrode 150 may comprise only one conductive strip 151, i.e. the connection electrode 150 may be a single conductive strip 151. Therefore, the structure and shape of the connection electrode 150 are not limited by fig. 1E.

The connection electrode 150 and the touch electrode 132 are electrically separated from each other, so that the touch electrode 132 and the common electrode bar 140 can be kept electrically separated without short circuit. The connection electrode 150 is disposed on the substrate 190. For example, the connection electrode 150 and the common electrode bars 140 may be formed by etching the same transparent conductive layer, so that the connection electrode 150 is located on the insulating layer 162 (see fig. 1D). In addition, the connecting electrode 150 may be located in an area outside the display area of the built-in touch display panel 100, that is, the connecting electrode 150 may not be disposed in the area of the built-in touch display panel 100 for displaying images.

Fig. 1F is a schematic layout diagram of the built-in touch display panel in fig. 1E in the area A2. Referring to fig. 1E and 1F, the touch electrodes 132 in one of the touch sensing regions 191 are electrically separated from the touch electrodes 132 in the other touch sensing region 191. Taking fig. 1F as an example, in a direction (shown in fig. 1F) of the vertical projection substrate 190 (not shown in fig. 1E and 1F), the touch electrodes 132 in one of the touch sensing regions 191 and the touch electrodes 132 in the other touch sensing region 191 are separated from each other on one of the second signal lines 112, so that the touch electrodes 132 in any two touch sensing regions 191 can be electrically separated from each other to avoid short circuit.

Specifically, a gap G12 is formed between the touch electrode 132 in one of the touch sensing areas 191 and the touch electrode 132 in the other touch sensing area 191 adjacent to the one of the touch sensing areas 191, and the gap G12 is located above the second signal line 112 and can extend along the second signal line 112. In other words, the gap G12 shown in fig. 1F can be regarded as a boundary between two adjacent touch sensing regions 191, and the two touch electrodes 132 located at the left and right sides of the gap G12 are respectively located in two different touch sensing regions 191.

Referring to fig. 1B, each of the touch electrodes 132 and each of the common electrode bars 140 may have a width H13, so the widths (i.e., the width H13) of each of the touch electrodes 132 and each of the common electrode bars 140 may be substantially equal to each other, that is, the width ratio of each of the touch electrodes 132 to each of the common electrode bars 140 may be 1:1. the width H13 may correspond to the height of the pixel 120, which may be between about 10 microns and 500 microns.

It should be noted that in other embodiments, the width H13 may be greater than the height of one pixel 120, for example, more than twice the height of the pixel 120. Therefore, the width H13 is not limited to correspond to the height of only one pixel 120. In addition, the width H13 of each touch electrode 132 may be less than or equal to the thickness of the human nail, which is about 500 μm, without affecting the overall touch function of the built-in touch display panel 100.

Referring to fig. 1E, the conventional built-in touch display panel also includes a plurality of touch electrodes, wherein each touch electrode may be substantially the same in size and shape as one touch sensing area 191 in fig. 1E and occupies the entire touch sensing area 191. However, in the present embodiment, the touch electrodes 132 have a touch sensing function, but the common electrode strip 140 does not have a touch sensing function, and the touch electrodes 132 in the same touch sensing area 191 do not occupy the entire touch sensing area 191. Therefore, compared to the conventional built-in touch display panel, the built-in touch display panel 100 of the present embodiment has a lower parasitic capacitance, and thus has better touch sensitivity.

When the width ratio of each touch electrode 132 to each common electrode strip 140 is substantially equal to or approximately 1: in case 1, the touch electrodes 132 in the same touch-sensing area 191 occupy about half of the area of one touch-sensing area 191. On the premise that each touch sensing region 191 shown in fig. 1E is regarded as a touch electrode of a conventional built-in touch display panel, since the touch electrodes 132 in the same touch sensing region 191 occupy about half the area of one touch sensing region 191, the configuration in which the width ratio of the touch electrodes 132 to the common electrode strips 140 is 1:1 can reduce the parasitic capacitance by half, thereby effectively improving the touch sensitivity of the built-in touch display panel 100.

Similarly, when the width ratio of each touch electrode 132 to each common electrode strip 140 is 1: 2, the touch electrodes 132 in the same touch sensing region 191 occupy about 1/3 of the area of the touch sensing region 191, so that the design in which the width ratio of the touch electrodes 132 to the common electrode strips 140 is 1: 2 can also reduce the parasitic capacitance by about 67% on the premise that each touch sensing region 191 is regarded as the touch electrode of the conventional built-in touch display panel.

Therefore, the ratio of the widths of the touch electrodes 132 and the common electrode bars 140 can affect the parasitic capacitance of the built-in touch display panel 100. Therefore, by using the design of different width ratios of the touch electrode 132 and the common electrode bar 140, the parasitic capacitance of the built-in touch display panel 100 can be changed, so as to reduce the parasitic capacitance to a predetermined range, for example, reduce the parasitic capacitance by about 50% or 67%, thereby effectively improving the touch sensitivity.

Fig. 2 is a schematic layout diagram of a built-in touch display panel according to another embodiment of the invention. Referring to fig. 2, the built-in touch display panel 200 shown in fig. 2 is similar to the built-in touch display panel 100. For example, the built-in touch display panel 200 also includes the common electrode bar 140 shown in fig. 1B, and both the built-in touch display panels 100 and 200 have substantially the same cross-sectional structure, wherein both the built-in touch display panels 100 and 200 include some of the same elements, such as the substrate 190. The same features of both the built-in touch display panels 100 and 200 are not described in principle, and the differences between the built-in touch display panels 100 and 200 will be mainly described below.

The built-in touch display panel 200 includes a plurality of touch electrodes 232 (only one is shown in fig. 2), and the width H23 of each touch electrode 232 is greater than the width H13. Taking fig. 2 as an example, width H13 is significantly greater than width H13 and is approximately twice width H13. Therefore, in the direction (as shown in fig. 2) of the vertical projection substrate 190 (not shown in fig. 2), at least one touch electrode 232 overlaps at least one first signal line 111, and in the present embodiment, each touch electrode 232 may overlap one first signal line 111.

It should be noted that, in the embodiment shown in fig. 2, the built-in touch display panel 200 may have a plurality of contact holes V2, and a single touch electrode 232 may be electrically connected to a touch trace 131 through the plurality of contact holes V2, as shown in fig. 2. However, in other embodiments, a single touch electrode 232 can be electrically connected to one touch trace 131 through only one contact hole V2, so that one contact hole V2 in fig. 2 can be omitted.

Next, in the embodiment shown in fig. 2, each touch electrode 232 may have a plurality of openings 133, wherein the openings 133 may extend and be arranged along the same touch trace 131. However, in other embodiments, a portion of the touch electrode 232 between the openings 133 in fig. 2 may be removed, so that the openings 133 can communicate with each other. In other words, a single touch electrode 232 may have a longer opening 133, and the length thereof may exceed the height (corresponding to the width H13) of the pixel 120. Therefore, the number and length of the openings 133 of each touch electrode 232 are not limited in fig. 2.

Fig. 3 is a schematic layout diagram of a built-in touch display panel according to another embodiment of the invention. Referring to fig. 3, the built-in touch display panel 300 shown in fig. 3 is similar to the built-in touch display panels 100 and 200. For example, the built-in touch display panel 300 also includes the touch electrode 132 in fig. 1B or the touch electrode 232 in fig. 2, and the cross-sectional structures of the built-in touch display panels 100, 200, and 300 are substantially the same and also include some of the same elements such as the substrate 190.

Unlike the built-in touch display panels 100 and 200 in the previous embodiments, the built-in touch display panel 300 includes a plurality of common electrode bars 340 (only one is shown in fig. 3), and the width H33 of each common electrode bar 340 is greater than the width H13, i.e. the width H33 of each common electrode bar 340 is significantly greater than the height of one pixel 120. Therefore, at least one common electrode stripe 340 overlaps at least one first signal line 111 in the direction (as shown in fig. 3) of the vertical projection substrate 190 (not shown in fig. 3), and in the present embodiment, each common electrode stripe 340 may overlap one first signal line 111.

In addition, in the embodiment shown in fig. 3, each common electrode bar 340 may have a plurality of openings 141, wherein the openings 141 may extend and be arranged along the same touch trace 131. However, in other embodiments, a portion of the common electrode stripe 340 between the openings 141 in fig. 3 may be removed to enable the openings 141 to communicate with each other. That is, a single common electrode stripe 340 may have a plurality of relatively long openings 141, the length of which may exceed the height (corresponding to the width H13) of the pixels 120. Therefore, the length of the opening 141 of each common electrode stripe 340 is not limited to fig. 3.

In summary, since each common electrode strip is electrically separated from each touch electrode, the touch electrodes electrically connected to the touch traces have a touch sensing function, but the common electrode strips have no touch sensing function. Thus, the design of the touch electrode and the common electrode line disclosed in the above embodiments can help to reduce the parasitic capacitance. Compared with the conventional built-in touch display panel, the built-in touch display panel of at least one embodiment of the invention has lower parasitic capacitance, thereby having better touch sensitivity.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (14)

1. A built-in touch display panel, comprising:

a substrate having a plurality of touch sensing areas;

a plurality of first signal lines disposed on the substrate;

a plurality of second signal lines disposed on the substrate, wherein the extending direction of each of the first signal lines is different from the extending direction of each of the second signal lines;

a plurality of pixels disposed on the substrate and located in the touch sensing regions, wherein each of the pixels comprises:

at least one pixel electrode;

at least one control element having a first end, a second end and a third end, wherein the first end is connected to one of the first signal lines, the second end is connected to one of the second signal lines, and the third end is connected to one of the pixel electrodes;

a plurality of touch electrodes disposed on the substrate and located in the touch sensing regions, wherein the touch electrodes located in the same touch sensing region are separated from each other, and the touch electrodes located in one of the touch sensing regions and the touch electrodes located in the other touch sensing region are electrically separated from each other;

a plurality of common electrode strips disposed on the substrate and in the touch sensing regions, wherein the common electrode strips are separated from each other and electrically connected to each other, and each common electrode strip and each touch electrode are electrically separated from each other;

and a plurality of touch wires arranged on the substrate and passing through at least one part of the touch sensing areas, wherein the touch electrodes in each touch sensing area are electrically connected with one of the touch wires.

2. The built-in touch display panel according to claim 1, wherein the touch electrodes and the common electrode bars are staggered within the same touch sensing area.

3. The built-in touch display panel according to claim 1, wherein the touch electrodes and the common electrode bars extend in the same direction.

4. The built-in touch display panel according to claim 1, wherein at least one of the common electrode strips passes through at least two of the touch sensing areas.

5. The built-in touch display panel according to claim 1, wherein one of the touch traces passes through at least one of the touch electrodes.

6. The built-in touch display panel according to claim 5, wherein one of the touch traces further passes through at least one of the common electrode strips.

7. The built-in touch display panel according to any of claims 1 to 6, further comprising:

and a connecting electrode arranged on the substrate and connected with the common electrode strips, wherein the connecting electrode and the touch electrodes are electrically separated from each other.

8. The built-in touch display panel of claim 7, wherein the connecting electrodes are connected to at least one end of each of the common electrode strips.

9. The built-in touch display panel of claim 7, wherein the connecting electrode comprises two conductive strips, and the extending direction of each conductive strip is different from the extending direction of the common electrode strips.

10. The built-in touch display panel of claim 1, further comprising:

at least one insulating layer disposed between the touch traces and the touch electrodes, wherein the touch electrodes penetrate through the at least one insulating layer to connect the touch traces.

11. The built-in touch display panel according to claim 1, wherein the touch electrodes and the common electrode bars adjacent to each other are separated from each other on one of the first signal lines in a direction perpendicular to the substrate.

12. The built-in touch display panel according to claim 1, wherein the touch electrodes in one of the touch sensing areas and the touch electrodes in the other of the touch sensing areas are separated from each other on one of the second signal lines in a direction perpendicular to the substrate.

13. The built-in touch display panel according to claim 1, wherein at least one of the touch electrodes overlaps at least one of the first signal lines in a direction perpendicular to the substrate.

14. The built-in touch display panel according to claim 1, wherein at least one of the common electrode strips overlaps at least one of the first signal lines in a direction perpendicular to the substrate.

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