TWI755028B - In-cell touch display panel - Google Patents

Abstract

An in-cell touch display panel includes a substrate, a plurality of pixels, a plurality of touch electrodes, a plurality of common electrode bars, and a plurality of touch traces. The substrate has a plurality of touch sensing areas. The pixels, the touch electrodes and the common electrode strips are disposed in the touch sensing areas. The touch electrodes located in the same touch sensing area are separated from each other. The touch electrodes located in one touch sensing area and the touch electrodes located in another touch sensing area are electrically separated from each other. The common electrode bars are separated from each other and electrically connected to each other. Each common electrode bar and each touch electrode are electrically separated from each other. The touch electrodes in each touch sensing area are electrically connected to one of the touch traces.

Description

Built-in touch display panel

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

Most of today's built-in touch display panels have a plurality of touch electrodes to sense the position and movement of an object, such as a finger or a stylus, and many of the above touch electrodes use capacitive sensing. The position and movement of the above-mentioned objects are sensed. Currently, each touch electrode included in a large-sized built-in touch display panel usually has a large size, which leads to an increase in parasitic capacitance. However, it is difficult to effectively reduce the parasitic capacitance in the design of a general built-in touch display panel. As a result, the existing built-in touch display panel, especially the built-in touch display panel with large-sized touch electrodes, generally has a low capacitance. Touch sensitivity.

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

The built-in touch display panel provided by at least one embodiment of the present invention includes 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 Multiple touch traces. The first signal lines, the second signal lines, the pixels, the touch electrodes, the common electrode strips and the touch wires are all disposed on the substrate. The substrate has a plurality of touch sensing areas. The extending direction of each of the first signal lines is different from the extending direction of each of the second signal lines. The pixels, the touch electrodes and the common electrode strips are all located in the touch sensing regions, wherein each pixel includes 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 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. The touch electrodes located in the same touch sensing area are separated from each other, and the touch electrodes located in one of the touch sensing areas and the touch electrodes located in the other touch sensing area are electrically connected to each other separation. The common electrode strips are separated from each other and are electrically connected to each other, and each of the common electrode strips and each of the touch electrodes are electrically separated from each other. The touch traces pass through at least a part of the touch sensing areas, wherein the touch electrodes in each touch sensing area are electrically connected to one of the touch traces.

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

In at least one embodiment of the present invention, the touch electrodes and the common electrode strips 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 touch electrode.

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 connection electrodes and the touch electrodes are electrically separated from each other.

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

In at least one embodiment of the present invention, the connection 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 pass through at least one insulating layer layer to connect these touch traces.

In at least one embodiment of the present invention, in a direction perpendicular to the projection substrate, adjacent touch electrodes and common electrode strips are separated from each other by one of the first signal lines.

In at least one embodiment of the present invention, in the direction perpendicular to the projection substrate, the touch electrodes located in one of the touch sensing regions and the touch electrodes located in the other touch sensing region are separated from each other by one of them The second signal line.

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

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

The above-mentioned design of the touch electrodes and the common electrode lines can help reduce parasitic capacitance. Compared with the conventional built-in touch display panel, the built-in touch display panel of at least one embodiment of the present invention has lower parasitic capacitance, thereby having better touch sensitivity.

In the following text, the dimensions (such as length, width, thickness and depth) of elements (such as layers, films, substrates and regions, etc.) in the drawings are exaggerated in unequal proportions in order to clearly present the technical features of the present application. . Therefore, the descriptions and explanations of the following embodiments are not limited to the dimensions and shapes of the elements in the drawings, but should cover the dimensions, shapes and deviations caused by actual manufacturing processes and/or tolerances. For example, the flat surfaces shown in the figures may have rough and/or non-linear features, while the acute angles shown in the figures may be rounded. Therefore, the elements shown in the drawings in this application are mainly for illustration, and are not intended to accurately depict the actual shapes of the elements, nor are they intended to limit the scope of the patent application of this application.

Secondly, words such as "about", "approximately" or "substantially" appearing in the content of this case not only cover the clearly stated numerical value and numerical value range, but also cover the understanding of those with ordinary knowledge in the technical field to which the invention belongs. The allowable deviation range of , wherein the deviation range can be determined by the error generated during measurement, for example, the error is caused by the limitations of both the measurement system or the process conditions. Further, "about" can mean within one or more standard deviations of the above-mentioned numerical value, eg, within ±30%, ±20%, ±10%, or ±5%. Words such as "about", "approximately" or "substantially" appearing in this text may be used to select acceptable ranges or standard deviations based on optical properties, etching properties, mechanical properties or other properties, not a single Standard deviation to apply all of the above optical, etch, mechanical and other properties.

FIG. 1A is a schematic diagram of wiring of a built-in touch display panel according to at least one embodiment of the present 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 these first The signal lines 111 may extend along the first direction D1, and the second signal lines 112 and the touch traces 131 may extend along the second direction D2.

The first direction D1 is different from the second direction D2. Taking FIG. 1A as an example, the first direction D1 can be substantially perpendicular to the second direction D2, so 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. However, the extending direction of a signal line 111 is obviously 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 first signal line 111 can be a scan line of the built-in touch display panel 100 , and each second signal line 112 can be a built-in touch display panel 100 . A data line of the display panel 100 is displayed. However, in other embodiments, each first signal line 111 can also be a data line, and each second signal line 112 can also be a scan line, so the first signal line 111 and the second signal line 112 are both The function, structure and extension direction are not limited by FIG. 1A .

Since the extending direction of each first signal line 111 is obviously different from the extending direction of each second signal line 112 and each touch wiring 131, both the second signal wiring 112 and the touch wiring 131 are the same as the first signal wiring 112 and the touch wiring 131. A signal line 111 is staggered, wherein the first signal lines 111 and the second signal lines 112 can be arranged in a net shape because they are staggered with each other to form a plurality of grids (not shown). In addition, at least one touch trace 131 may be adjacent to one of the second signal traces 112 . For example, each touch trace 131 may be adjacent to one of the second signal traces 112 .

The built-in touch display panel 100 further includes a plurality of pixels 120, wherein the pixels 120 can be respectively located in the grids. Taking FIG. 1A as an example, each grid can be surrounded by two adjacent first signal lines 111 and two adjacent second signal lines 112 , and one pixel 120 can be located in each grid. In other words, the pixels 120 can be arranged in the grids one-to-one and surrounded by two adjacent first signal lines 111 and two adjacent second signal lines 112 , as shown in FIG. 1A . Furthermore, in the embodiment shown in FIG. 1A , each pixel 120 may be a sub-pixel. However, in other embodiments, each pixel 120 may also be a main pixel with multiple sub-pixels, so the pixel 120 is 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, wherein the transparent metal oxide is, for example, Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO).

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

The control element 122 may have a plurality of signal terminals, and these signal terminals are used to electrically connect the signal lines (eg, the first signal line 111 and the second signal line 112 ) or other elements (eg, the pixel electrodes 121 ). For example, the control element 122 in FIG. 1A may have three signal terminals: a first terminal 122g, a second terminal 122s and a third terminal 122d. In the embodiment shown in FIG. 1A , the control element 122 may be a Field-Effect Transistor (FET), and has a gate, a drain, a 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.

1B is a schematic diagram of the wiring of the built-in touch display panel in FIG. 1A , FIG. 1C is a schematic cross-sectional view taken along the line 1C-1C in FIG. 1B , and FIG. 1D is a cross-section drawn along the line 1D-1D in FIG. 1B Schematic cross section. 1B is similar to FIG. 1A , but different from FIG. 1A . FIG. 1B illustrates touch electrodes 132 and common electrode strips 140 that do not appear in FIG. 1A , wherein the touch electrodes 132 and common electrode strips 140 shown in FIG. 1B are shown in FIG. 1B . All are presented in the form of a dot matrix pattern. In addition, in FIG. 1B , the characters appearing in the regions of the touch electrodes 132 and the common electrode strips 140 (ie, the cross-hatched lines "1C" and "1D") are displayed as blank patterns in a small area around them. A dot pattern will appear.

Referring to FIGS. 1B to 1D , the built-in touch display panel 100 further includes a plurality of touch electrodes 132 (only one is shown in FIGS. 1B and 1C ), a plurality of common electrode strips 140 (only one is shown in FIGS. 1B and 1D ) one) and the substrate 190. The substrate 190 is, for example, a transparent substrate such as a glass plate or a transparent plastic plate. The touch electrodes 132 are all 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. 1C ). 1D). Both the touch electrodes 132 and the common electrode strips 140 can be transparent conductive layers, which can be made of transparent metal oxides, 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 all 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 (ie the gate) of the control element 122 and the first signal lines 111 can 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 both 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 122 g and the first signal line 111 . The second signal line 112 , the touch wiring 131 , the channel layer 122c of the control element 122 , the second end 122s and the third end 122d are all located on the insulating layer 160 , wherein the second end 122s and the third end 122d are both partially covered The channel layer 122c and the second end 122s are connected to one of the second signal lines 112 . The channel layer 122c is a semiconductor layer and is electrically connected to the second end 122s and the third end 122d. In addition, the second end 122s, the third end 122d, the touch wire 131 and the second signal wire 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. The insulating layer 162 is formed on the insulating layer 161 , and the insulating layer 163 is formed on the insulating layer 162 . The touch electrodes 132 are formed on the insulating layer 162 and covered by the insulating layer 163, as shown in FIG. 1C. Likewise, 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 strips 140 .

In other embodiments, the insulating layers 161 and 162 can be replaced with a single insulating layer, that is, 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 traces 131 and the touch electrodes 132 , which is not limited by the insulating layers 161 and 162 in FIGS. 1C and 1D . In addition, the touch electrodes 132 and the common electrode strips 140 may be formed by etching the same transparent conductive layer, wherein the transparent conductive layer is, for example, indium tin oxide (ITO) or indium zinc oxide (IZO).

Each pixel electrode 121 is formed on the insulating layer 163 and overlapped with the touch electrodes 132 or the common electrode strips 140 . Therefore, the insulating layer 163 is disposed between the pixel electrodes 121 and the touch electrodes 132 . The insulating layers 161 , 162 and 163 have a plurality of contact holes V1 , wherein each contact hole 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 ends 122d respectively, so that a part of the third ends 122d at the bottom of the contact holes 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 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 electrode 121. Element electrode 121 .

In addition, the insulating layers 161 and 162 may have a plurality of contact holes V2 (one is shown in both FIG. 1B and FIG. 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 that of the contact hole V1 . The contact holes V2 correspond to the touch traces 131 respectively, so that part of the touch traces 131 at the bottom of the contact holes V2 are 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 pass through the insulating layers 161 and 162 to connect the touch traces 131 . In this way, 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 insulating layers 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 correspond to the Touch trace 131 . In detail, each opening 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 strips and correspond to the touch traces. The shape of the line 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 contact between the touch electrodes 132 and the common electrode strips 140 and the touch traces 131 . The parasitic capacitance generated between the two can improve the touch sensitivity of the built-in touch display panel 100 .

In addition, each of the touch electrodes 132 may further have a plurality of openings 134, and each of the common electrode bars 140 may further have a plurality of openings 142, wherein the openings 134 and 142 correspond to the contact holes V1 respectively. Specifically, the contact hole V1 is located in the opening 134 or 142 , wherein the respective sidewalls of the openings 134 and 142 surround the contact hole V1 . Therefore, neither the touch electrodes 132 nor the common electrode strips 140 contact the pixel electrodes 121 in the contact holes V1 to avoid short circuits between the touch electrodes 132 and the common electrode strips 140 and the pixel electrodes 121 .

Please refer to FIGS. 1C and 1D , the built-in touch display panel 100 may further include an opposite substrate 180 and a display medium 170 , wherein FIGS. 1A and 1B are shown without the opposite substrate 180 and the display medium 170 . The built-in touch display panel 100 is provided. The opposite substrate 180 is disposed on the opposite side of 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 this embodiment may be a Fringe Field Switching (FFS) liquid crystal display panel, while the built-in touch display panel 100 in other embodiments may be Transverse electric field switching type (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 the common electrode (pixel on common electrode), but in other embodiments, the pixel 120 may also have the common electrode on the pixel electrode (common on electrode). pixel electrode) structure.

The opposite substrate 180 includes a carrier plate 181 , a black matrix 182 and a plurality of filter layers 183 . The black matrix 182 and the filter layers 183 are both disposed on the carrier plate 181 , wherein the shape of the black matrix 182 is a mesh, so 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 element 122 , the first signal line 111 , the second signal line 112 and the touch wiring 131 .

The filter layers 183 correspond to the pixel electrodes 121 respectively, 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 the filter layers 183 can filter the light emitted from the pixel electrodes 121 into Red light, filtered light, and blue light contribute to the formation of images.

Referring to FIGS. 1B to 1D , the common electrode strips 140 and the touch electrodes 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 usually different from the pixel voltage, so an electric field can be generated between the pixel electrodes 121 and the common electrode strips 140 . Since the pixel electrode 121 has a plurality of parallel slits 121s, an electric field with a horizontal component can be generated between the pixel electrode 121 and the common electrode strip 140 . When the display medium 170 is a liquid crystal material, an electric field with a horizontal component can drive the liquid crystal molecules in the liquid crystal material (display medium 170 ) to deflect, so that the built-in touch display panel 100 can display images.

In addition, FIGS. 1A and 1B are basically drawn along the direction parallel to the normal line N1 of the substrate 190 when viewing the built-in touch display panel 100 , so the built-in touch display panel 100 shown in FIGS. 1A and 1B is drawn. It is shown by viewing the built-in touch display panel 100 in the direction perpendicular to the projection substrate 190 . From FIG. 1B , in the direction perpendicular to the projection substrate 190 , the adjacent touch electrodes 132 and the common electrode strips 140 are separated from each other on one of the first signal lines 111 .

In other words, there is a gap (not shown) between the adjacent touch electrodes 132 and the common electrode strip 140 , and the gap is formed above one of the first signal lines 111 , that is, the gap can be aligned with the first signal line 111 . The above-mentioned gap enables the touch electrodes 132 and the common electrode strips 140 to be kept electrically separated without being connected or touching each other, so as to avoid a short circuit between the touch electrodes 132 and the common electrode strips 140, thereby maintaining or improving the built-in touch. The touch function of the display panel 100 is controlled.

FIG. 1E is a schematic diagram of the wiring of the touch electrodes, the common electrode strip, and the touch wiring in FIG. 1B , wherein FIG. 1B is a schematic diagram of the wiring in the area A1 in FIG. 1E . Please refer to FIG. 1B and FIG. 1E , the substrate 190 has a plurality of touch sensing regions 191 , wherein these touch sensing regions 191 are shown by dotted lines in FIG. 1B . The touch sensing areas 191 may be arranged in an array, and the pixels 120 and the touch electrodes 132 are all 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 located in the same touch sensing area 191 are separated from each other.

Taking FIG. 1E as an example, four touch electrodes 132 can be located in the same touch sensing area 191 , wherein the four touch electrodes 132 are separated from each other and can 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 multiple 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 area 191 , wherein the pixels 120 may be the primary pixel or the secondary pixel.

The touch electrodes 132 are strip-shaped, and the extension 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 strips 140 both extend along the first direction D1. Secondly, at least one common electrode strip 140 can pass through at least two touch sensing regions 191 . Taking FIG. 1E as an example, each of the common electrode strips 140 may pass through more than two touch sensing regions 191 .

It is worth mentioning that, under the condition that the built-in touch display panel 100 is a boundary electric field switching (FFS) liquid crystal display panel or a lateral electric field switching (IPS) liquid crystal display panel, in FIG. 1E along the first direction D1 The extended touch electrodes 132 and the common electrode strips 140 can generate an electric field that affects the deflection of liquid crystal molecules, which can help reduce light leakage and improve image quality.

The extending direction of the touch traces 131 is different from the extending directions of the touch electrodes 132 and the common electrode strips 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 strips 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 part of the touch sensing regions 191 . In the embodiment shown in FIG. 1E , the shortest touch traces 131 will pass through a part of the lowermost touch sensing area 191 , but not the entire touch sensing area 191 , and the longest touch traces 131 will Pass through a plurality of complete touch sensing areas 191 . It can be seen from this that each touch trace 131 passes through at least one complete touch sensing area 191 , or only passes through a part of one of the touch sensing areas 191 , but does not pass through the complete touch sensing area 191 . .

The common electrode strips 140 are located in the touch sensing regions 191 , wherein the common electrode strips 140 are separated from each other, and in the same touch sensing region 191 , the touch electrodes 132 and the common electrode strips 140 can be interlaced with each other arrangement. Therefore, the touch electrodes 132 in the same touch sensing area 191 do not occupy the entire touch sensing area 191 .

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

The above-mentioned gap enables the touch electrodes 132 and the common electrode strips 140 to be kept electrically separated without being connected to or touching each other, so as to avoid a short circuit between the touch electrodes 132 and the common electrode strips 140 . In addition, each touch trace 131 is also 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. It can be seen that the touch electrodes 132 have the function of touch sensing, but the common electrode strip 140 does not have the function of touch sensing.

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 The electrodes 132 can perform touch sensing. When an object (eg, a finger or a stylus) touches the built-in touch display panel 100, the touch electrodes 132 for touch sensing can detect the position and movement of the object. In this way, the user can use the object to touch and operate the built-in touch display panel 100 .

The common electrode strips 140 are electrically connected to each other. Specifically, the built-in touch display panel 100 may further include connection electrodes 150 , wherein the connection electrodes 150 are connected to the common electrode strips 140 so that the common electrode strips 140 can be electrically connected to each other. In the embodiment shown in FIG. 1E , the connection electrode 150 includes 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 of the conductive strips 151 extends along the second direction D2.

The conductive strips 151 connect the two ends of the common electrode strips 140 respectively, so that the connecting electrodes 150 and the common electrode strips 140 can form a fence-shaped common electrode, and the common electrode strips 140 can also be electrically connected to each other. In addition, in other embodiments, the connection electrode 150 may include only one conductive strip 151 , that is, 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 electrodes 150 and the touch electrodes 132 are electrically separated from each other, so that the touch electrodes 132 and the common electrode strips 140 can be kept electrically separated without short-circuiting. The connection electrodes 150 are disposed on the substrate 190 . For example, the connecting electrodes 150 and the common electrode strips 140 may be formed by etching the same transparent conductive layer, so the connecting electrodes 150 are located on the insulating layer 162 (please refer to FIG. 1D ). In addition, the connection electrodes 150 may be located outside the display area of the built-in touch display panel 100 , that is, the connection electrodes 150 may not be disposed in the area of the built-in touch display panel 100 for displaying images.

FIG. 1F is a schematic diagram of the wiring of the built-in touch display panel in the area A2 in FIG. 1E . Please refer to FIG. 1E and FIG. 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 electrically separated from each other. Taking FIG. 1F as an example, the touch electrodes 132 located in one of the touch sensing regions 191 are in a direction perpendicular to the projection substrate 190 (not shown in FIG. 1E and FIG. 1F ) (as shown in FIG. 1F ). The touch electrodes 132 in the other touch sensing area 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 areas 191 can be electrically connected to each other. separation to avoid short circuits.

Specifically, a gap G12 is formed between the touch electrodes 132 in one of the touch sensing regions 191 and the touch electrodes 132 in the other adjacent touch sensing regions 191 , and the gap G12 is located in the first Above the second signal line 112 and may 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 on the left and right sides of the gap G12 are located on two different touch Control sensing area 191 .

Referring to FIG. 1B , each of the touch electrodes 132 and each of the common electrode strips 140 may have a width H13 , so the widths (ie, the widths H13 ) of each of the touch electrodes 132 and each of the common electrode strips 140 may be substantially equal to each other That is, the width ratio between each touch electrode 132 and each common electrode strip 140 may be 1:1. The width H13 may be equivalent to the height of the pixel 120 , which may be approximately between 10 μm and 500 μm.

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 a height equivalent to only one pixel 120 . In addition, without affecting the overall touch function of the built-in touch display panel 100 , the width H13 of each touch electrode 132 can be less than or equal to the thickness of a human fingernail, which is about 500 μm.

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

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

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

It can be seen that the width ratio of the touch electrodes 132 and the common electrode strips 140 can affect the parasitic capacitance of the built-in touch display panel 100 . Therefore, the parasitic capacitance of the built-in touch display panel 100 can be changed by using the design of the different width ratios of the touch electrodes 132 and the common electrode strips 140 , thereby reducing the parasitic capacitance to a predetermined range, for example, by about 50%. Or 67% of the parasitic capacitance, thereby effectively improving the touch sensitivity.

FIG. 2 is a schematic diagram of wiring of a built-in touch display panel according to another embodiment of the present invention. Please refer 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 strip 140 as shown in FIG. 1B , and the cross-sectional structures of the built-in touch display panels 100 and 200 are substantially the same, wherein the built-in touch display panel Both 100 and 200 include some of the same components, such as substrate 190 . In principle, the same features of the built-in touch display panels 100 and 200 will not be described, and the following mainly introduces the differences between the built-in touch display panels 100 and 200 .

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, the width H13 is significantly larger than the width H13, and is approximately twice the width H13. Therefore, in the direction perpendicular to the projection substrate 190 (not shown in FIG. 2 ) (as shown in FIG. 2 ), at least one touch electrode 232 overlaps with at least one first signal line 111 , and in this embodiment, each touch The electrodes 232 may overlap with one of the first signal lines 111 .

It is worth mentioning 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 through the plurality of contact holes V2 A touch trace 131 is shown in FIG. 2 . However, in other embodiments, a single touch electrode 232 can be electrically connected to one touch trace 131 only through one contact hole V2, so 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 part of the touch electrodes 232 between the openings 133 in FIG. 2 can be removed so that the openings 133 can communicate with each other. In other words, a single touch electrode 232 can have a long opening 133 whose length can exceed the height of the pixel 120 (equivalent to the width H13 ). Therefore, the number and length of the openings 133 of each touch electrode 232 are not limited by FIG. 2 .

FIG. 3 is a schematic diagram of wiring of a built-in touch display panel according to another embodiment of the present invention. Please refer 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 electrodes 132 in FIG. 1B or the touch electrodes 232 in FIG. 2 , and the cross-sectional structures of the built-in touch display panels 100 , 200 and 300 are substantially are the same, and also include some of the same elements such as substrate 190 .

Different from the built-in touch display panels 100 and 200 in the foregoing embodiments, the built-in touch display panel 300 includes a plurality of common electrode strips 340 (only one is shown in FIG. 3 ), and each of the common electrode strips 340 has a The width H33 is greater than the width H13 , that is, the width H33 of each common electrode strip 340 is significantly greater than the height of one pixel 120 . Therefore, in the direction perpendicular to the projection substrate 190 (not shown in FIG. 3 ) (as shown in FIG. 3 ), at least one common electrode strip 340 overlaps with at least one first signal line 111 , and in this embodiment, each of the strips shares the same The electrode strips 340 may overlap with one of the first signal lines 111 .

In addition, in the embodiment shown in FIG. 3 , each of the common electrode strips 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 strips 340 between the openings 141 in FIG. 3 may be removed so that the openings 141 can communicate with each other. That is to say, a single common electrode strip 340 may have a plurality of relatively long openings 141 , the length of which may exceed the height of the pixel 120 (equivalent to the width H13 ). Therefore, the length of the opening 141 of each common electrode strip 340 is not limited by FIG. 3 .

To sum up, since each of the common electrode strips and each of the touch electrodes are electrically separated from each other, the touch electrodes electrically connected to the touch traces have the function of touch sensing, but the common electrode strips do not have touch sensing. function. In this way, the design of the touch electrodes and the common electrode lines disclosed in the above embodiments can help 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 present invention has lower parasitic capacitance, thereby having better touch sensitivity.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the appended patent application.

100, 200, 300: Built-in touch display panel

111: The first signal line

112: The second signal line

120: Pixel

121: pixel electrode

121s: Slit

122: Control elements

122c: Channel Layer

122d: three terminals

122g: first end

122s: second end

131: Touch trace

132, 232: touch electrode

133, 134, 141, 142: Openings

140, 340: Common electrode strip

150: Connect electrodes

151: Conductive strip

160, 161, 162, 163: insulating layer

170: Display Medium

180: Opposite substrate

181: Carrier plate

182: Black Matrix

183: filter layer

190: Substrate

191: Touch Sensing Area

A1, A2: Area

D1: first direction

D2: Second direction

G12: Gap

H13, H23, H33: Width

N1: normal

V1, V2: Contact holes

1A and 1B are schematic diagrams of wiring diagrams of a built-in touch display panel according to at least one embodiment of the present invention. FIG. 1C is a schematic cross-sectional view taken along the line 1C-1C in FIG. 1B . FIG. 1D is a schematic cross-sectional view taken along the line 1D-1D in FIG. 1B . FIG. 1E is a schematic diagram of the wiring of the touch electrodes, the common electrode strips and the touch traces in FIG. 1B . FIG. 1F is a schematic diagram of the wiring of the built-in touch display panel in the area A2 in FIG. 1E . FIG. 2 is a schematic diagram of wiring of a built-in touch display panel according to another embodiment of the present invention. FIG. 3 is a schematic diagram of wiring of a built-in touch display panel according to another embodiment of the present invention.

100: Built-in touch display panel

131: Touch trace

132: Touch electrode

140: Common electrode strip

150: Connect electrodes

151: Conductive strip

190: Substrate

191: Touch Sensing Area

A1, A2: Area

D1: first direction

D2: Second direction

Claims (14)

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 extension direction of each of the first signal lines is different from the extension direction of each of the second signal lines; A plurality of pixels are disposed on the substrate and located in the touch sensing regions, wherein each of the pixels includes: at least one pixel electrode; At least one control element has 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 The third end is connected to one of the pixel electrodes; A plurality of touch electrodes are disposed on the substrate and located in the touch sensing areas, wherein the touch electrodes located in the same touch sensing area are separated from each other, and are located in one of the touch sensing areas the touch electrodes in the detection area and the touch electrodes in the other touch sensing area are electrically separated from each other; A plurality of common electrode strips are disposed on the substrate and located in the touch sensing regions, wherein the common electrode strips are separated from each other and are electrically connected to each other, and each of the common electrode strips is connected to each of the touch electrodes electrically separated from each other; A plurality of touch traces are disposed on the substrate and pass through at least a part of the touch sensing areas, wherein the touch electrodes in each touch sensing area are electrically connected to one of the touch sensing areas Traces. The built-in touch display panel of claim 1, wherein in the same touch sensing area, the touch electrodes and the common electrode strips are staggered. The built-in touch display panel of claim 1, wherein the touch electrodes and the common electrode strips extend in the same direction. The built-in touch display panel of claim 1, wherein at least one of the common electrode strips passes through at least two of the touch sensing regions. The built-in touch display panel of claim 1, wherein one of the touch wires passes through at least one of the touch electrodes. The built-in touch display panel according to claim 5, wherein one of the touch wires further passes through at least one of the common electrode strips. The built-in touch display panel according to any one of claims 1 to 6, further comprising: A connection electrode is disposed on the substrate and connected to the common electrode strips, wherein the connection electrode and the touch electrodes are electrically separated from each other. The built-in touch display panel of claim 7, wherein the connection electrode is connected to at least one end of each of the common electrode strips. The built-in touch display panel as claimed in claim 7, wherein the connection electrode comprises two conductive strips, and the extending direction of each of the conductive strips is different from the extending direction of the common electrode strips. The built-in touch display panel according to claim 1, further comprising: At least one insulating layer is disposed between the touch wires and the touch electrodes, wherein the touch electrodes pass through the at least one insulating layer to connect the touch wires. The built-in touch display panel as claimed in claim 1, wherein in the direction of vertical projection of the substrate, the adjacent touch electrodes and the common electrode strip are separated from each other on one of the first signal lines. The built-in touch display panel according to claim 1, wherein the touch electrodes located in one of the touch sensing regions and the touch electrodes located in the other touch sensing region in the direction of vertical projection of the substrate The touch electrodes inside are separated from each other on one of the second signal lines. The built-in touch display panel according to claim 1, wherein in the direction of vertical projection of the substrate, at least one of the touch electrodes overlaps with at least one of the first signal lines. The built-in touch display panel as claimed in claim 1, wherein in a vertical projection direction of the substrate, at least one of the common electrode strips overlaps with at least one of the first signal lines.

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