CN108459771B

CN108459771B - Touch control display panel

Info

Publication number: CN108459771B
Application number: CN201810200189.7A
Authority: CN
Inventors: 郭柏佑; 赵骏铭
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2018-01-08
Filing date: 2018-03-12
Publication date: 2021-05-28
Anticipated expiration: 2038-03-12
Also published as: TW201931082A; TWI646453B; CN108459771A

Abstract

A touch display panel is provided with a display area and a non-display area surrounding the display area. The touch display panel comprises a first substrate, a second substrate, a plurality of active components, a sealant, a touch electrode, a conductive layer and at least one heightening structure. The active element is located in the display area. The frame glue is positioned in the non-display area and surrounds the display area. The heightening structure is arranged between the active element and the frame glue, and a distance is reserved between the heightening structure and the frame glue. The pitch is substantially constant.

Description

Touch control display panel

Technical Field

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

Background

The touch display panel can be generally classified into an out-cell (out-cell), an on-cell (on-cell), and an in-cell (in-cell) according to the relative position of the touch electrode and the display panel. Compared with the external and integrated touch display panels, the built-in touch display device has the advantage of easy thinning, and thus is widely applied to various electronic products.

At present, when signals of a touch electrode and a pixel electrode respectively located on an opposite substrate are integrated on the same substrate, the resistance of the conventional built-in touch display panel is increased due to an excessively small contact area between a conductive layer of the pixel panel and the touch electrode of the touch panel, thereby reducing the touch effect. Therefore, a touch display panel capable of increasing the contact area between the conductive layer and the touch electrode is an urgent problem in the art.

Disclosure of Invention

The invention provides a touch display panel, which can increase the contact area between a touch electrode of the touch panel and a conductive layer of the display panel and reduce impedance.

The touch display panel of the invention is provided with a display area and a non-display area surrounding the display area. The touch display panel comprises a first substrate, a second substrate, a plurality of active elements, a sealant, a touch electrode, a conductive layer and at least one heightening structure. The second substrate is arranged opposite to the first substrate. The active elements are positioned between the first substrate and the second substrate and positioned in the display area. The frame glue is arranged between the first substrate and the second substrate and is positioned in the non-display area, and the frame glue surrounds the display area. The touch electrode is arranged on the second substrate. The conductive layer is disposed on the first substrate and electrically connected to the touch electrode. At least one heightening structure is arranged between the active element and the frame glue. The heightening structure is positioned between the first substrate and the conductive layer or between the second substrate and the touch control electrode. At least one of the raised structures has a distance from the frame glue, and the distance is substantially a fixed value.

In an embodiment of the invention, the at least one padding structure surrounds the display area.

In an embodiment of the invention, the at least one raised structure is a continuous or discontinuous pattern.

In an embodiment of the invention, the at least one raised structure includes at least one first annular structure and at least one second annular structure. The at least one first annular structure and the frame glue have a first distance x. The at least one second annular structure and the frame glue have a second distance y. Both x and y are substantially constant values, and x ≠ y.

In an embodiment of the invention, the touch display panel further includes at least one signal pad. At least one signal connecting pad is electrically connected to the conductive layer. The at least one signal connecting pad is arranged on the first substrate and is positioned on one side of the frame glue away from the display area.

In an embodiment of the invention, the at least one padding structure and the frame adhesive are concentric rings to surround the display area.

In an embodiment of the invention, the at least one padding structure is a long strip structure.

In an embodiment of the invention, the at least one padding structure is located between the second substrate and the touch electrode, and the at least one padding structure has a first surface closest to the second substrate. The frame glue has a second surface closest to the second substrate. The height of the first surface is greater than or substantially equal to the height of the second surface.

In an embodiment of the invention, the at least one elevated structure is located between the first substrate and the conductive layer, and the conductive layer covering the at least one elevated structure has a third surface closest to the second substrate. The height of the third surface is greater than or substantially equal to the height of the second surface.

In an embodiment of the invention, the at least one raised structure and the conductive layer are integrally formed, or the at least one raised structure and the touch electrode are integrally formed.

Based on the above, since the raised structures are disposed between the active devices and the sealant and have a distance with the sealant, and the distance between each raised structure and the sealant is substantially constant, the contact area of the raised structure against the first substrate or the second substrate can be increased. When the contact area of the padding structure is increased, the area of the conductive layer or the touch electrode arranged on the padding structure is also increased, so that the contact area between the conductive layer and the touch electrode is increased, the impedance between the conductive layer and the touch electrode is reduced, and the effect of a touch signal is improved.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic top view of a touch display panel according to an embodiment of the invention.

Fig. 2A is a schematic partial cross-sectional view of the touch display panel along a sectional line a-a' in fig. 1.

Fig. 2B is a schematic partial cross-sectional view of a touch display panel according to another embodiment of the invention.

Fig. 3A is a schematic top view of a portion of a touch display panel according to an embodiment of the invention.

Fig. 3B is a schematic partial cross-sectional view of the touch display panel shown in fig. 3A.

Fig. 3C is a schematic partial cross-sectional view illustrating a touch display panel according to another embodiment of the invention.

Fig. 3D is a partially enlarged schematic view of the touch display panel shown in the region R of fig. 3A.

Fig. 4 is a schematic top view of a portion of a touch display panel according to another embodiment of the invention.

Fig. 5A is a schematic top view of a portion of a touch display panel according to another embodiment of the invention.

Fig. 5B is a schematic top view of a portion of a touch display panel according to yet another embodiment of the invention.

Wherein, the reference numbers:

10. 10', 10 ", 10a, 10 b: touch control display panel

100: first substrate

110: gate insulating layer

112: conductive structure

120: conducting wire

130: a first flat layer

132: first sub-flat layer

134: second sub-planarization layer

136: first opening

160. 160': conductive layer

162: third surface

170: sub-pixel

172: a first electrode

174: light-emitting pattern

176: second electrode

180: spacer

200: second substrate

201: inner face

210: a second flat layer

212: third sub-planarization layer

214: fourth sub-planarization layer

215: surface of

216: second opening

220. 230, 240': touch electrode

300. 300 b: frame glue

302: second surface

400: signal connecting pad

500. 500', 500 ", 500a, 500 b: elevating structure

501: bottom surface

502: the top surface

503: first surface

510: a first ring structure

520: second annular structure

600: flexible circuit board

620: driver IC

640: connecting pad

AA: display area

A-A': section line

BA: non-display area

CH: semiconductor pattern

D: drain electrode

d1, d2, k 1: distance between two adjacent plates

G: grid electrode

R: region(s)

S: source electrode

SL: signal line

T: active component

x: first interval

y: second pitch

Detailed Description

Hereinafter, specific embodiments will be described in more detail with reference to the accompanying drawings. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the accompanying drawings, the size of layers and regions is exaggerated for clarity of illustration, and like or corresponding symbols refer to like or corresponding elements.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a "first element," "component," "region," "layer," or "portion" discussed below could be termed a second element, component, region, layer, or portion without departing from the teachings herein.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms, including "at least one", unless the content clearly indicates otherwise. "or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions integers, steps, operations, elements, components, and/or groups thereof.

Furthermore, relative terms, such as "lower" or "bottom" and "upper" or "top," may be used herein to describe one element's relationship to another element, as illustrated. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in one of the figures is turned over, elements described as being on the "lower" side of other elements would then be oriented on "upper" sides of the other elements. Thus, the exemplary term "lower" can include both an orientation of "lower" and "upper," depending on the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as "below" or "beneath" other elements would then be oriented "above" the other elements. Thus, the exemplary terms "below" or "beneath" can encompass both an orientation of above and below.

As used herein, "about", "substantially", or "approximately" includes the stated value and the average value within an acceptable range of deviation of the specified value as determined by one of ordinary skill in the art, taking into account the measurement in question and the specified amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "substantially" may mean within one or more standard deviations of the stated value, or within ± 20%, ± 10%, ± 5%.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Exemplary embodiments are described herein with reference to cross-sectional views that are schematic illustrations of idealized embodiments. Thus, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, the embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region shown or described as flat may generally have rough and/or nonlinear features. Further, the acute angles shown may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims.

Fig. 1 is a schematic top view of a touch display panel according to an embodiment of the invention. Fig. 2A is a schematic partial cross-sectional view of the touch display panel along a sectional line a-a' in fig. 1. For clarity, fig. 1 shows the first substrate 100, the display area AA located on the first substrate 100, a non-display area BA surrounding the display area AA, a plurality of active devices T, a plurality of signal lines SL, a padding structure 500, the sealant 300 and the signal connection pads 400, and other components of the second substrate 200 are omitted.

Referring to fig. 1 and fig. 2A, the touch display panel 10 has a display area AA and a non-display area BA, and includes a first substrate 100, a second substrate 200 disposed opposite to the first substrate 100, a plurality of active devices T, a conductive layer 160, a touch electrode 220, and at least one pad-up structure. In the present embodiment, a plurality of active devices T are disposed between the first substrate 100 and the second substrate 200 and in the display area AA. The conductive layer 160 is disposed on the first substrate 100, the touch electrode 220 is disposed on the second substrate 200, and the conductive layer 160 is electrically connected to the touch electrode 220. The sealant 300 is disposed between the first substrate 100 and the second substrate 200 and located in the non-display area BA, and the sealant 300 surrounds the display area AA. Referring to fig. 3B, in the present embodiment, a plurality of spacers 180, such as but not limited to: photoresist spacers (photo-spacers) to form the gaps (cell gap).

Referring to fig. 1, the touch display panel 10 has a display area AA and a non-display area BA substantially surrounding the display area AA. The ranges of the display area AA and the non-display area BA shown in fig. 1 are exemplary, and the invention is not limited thereto, and the ranges of the display area AA and the non-display area BA may vary according to practical applications. In an embodiment of the invention, the materials of the first substrate 100 and the second substrate 200 may be the same or different. More specifically, the material of the second substrate 200 on which the touch electrode 220 is formed is a transparent material, and the material of the first substrate 100 is a transparent or opaque/reflective material. The light transmissive material is, for example, glass, quartz, organic polymer, or other applicable material, and the opaque/reflective material is, for example, wafer, ceramic, or other applicable material.

In the present embodiment, the plurality of signal lines SL are formed on the first substrate 100, and are disposed in the display area AA and staggered (interlaced) with each other. The plurality of signal lines SL are, for example: the data lines, the scan lines, the power supply lines, or other suitable lines, or at least one of the foregoing lines may belong to different layers, but the invention is not limited thereto.

Referring to fig. 1 and fig. 2A, a plurality of active devices T are disposed on the first substrate 100 and located in the display area AA. For example, a plurality of active devices T are disposed on the first substrate 100 corresponding to a plurality of signal lines SL disposed in a staggered manner, and electrically connected to the plurality of signal lines SL, for example: the data lines and the scanning lines are respectively electrically connected with the active element T. In the present embodiment, the active device T, the first electrode 172 electrically connected to the active device T, the light emitting pattern 174 disposed on the first electrode 172, and the second electrode 176 covering the light emitting pattern 174 form a sub-pixel 170. The active device T includes, but is not limited to, a thin film transistor, and it may include a bottom-gate (bottom-gate), a top-gate (top-gate), or a vertical TFT (vertical TFT), or other suitable transistors. Each active device T may include a gate electrode G, a semiconductor pattern CH separated from the gate electrode G by a gate insulating layer 110, and a source electrode S and a drain electrode D electrically connected to two different regions of the semiconductor pattern CH, respectively.

For example, in the present embodiment, the touch display panel 10 further includes a conductive structure 112 and a first planarization layer 130. The conductive structure 112 extends outward from the drain D and is electrically connected to the drain D. In the present embodiment, the conductive structure 112 and the drain D may be selectively formed in the same layer, but the invention is not limited thereto. The first planarization layer 130 covers the active device T and a portion of the conductive structure 112. The first planarization layer 130, which may be a single-layer or a dual-layer structure, includes a first sub-planarization layer 132 and a second sub-planarization layer 134. The first electrode 172 is disposed on the first sub-planarization layer 132 and electrically connected to the conductive structure 112 through the first sub-planarization layer 132. However, the invention is not limited thereto, and in other embodiments, the first electrode 172 of the sub-pixel 170 may be electrically connected to the drain D of the active device T by other methods.

In the present embodiment, the second sub-planarization layer 134 exposes the first electrode 172 through a first opening 136, and the first opening 136 can be used to define the pixel. For example, the light emitting pattern 174 of the sub-pixel 170 is disposed in the first opening 136 and electrically connected to the first electrode 172. In the present embodiment, the light emitting pattern 174 is, for example, an organic light emitting diode layer. The second electrode 176 of the sub-pixel 170 may be disposed on the second sub-planarization layer 134 and fill the first opening 136 to be electrically connected to the light emitting pattern 174.

Referring to fig. 2A, in the present embodiment, a second substrate 200 is disposed opposite to the first substrate 100. The

touch electrodes

220, 230, and 240 are disposed on the second substrate 200 and located between the first substrate 100 and the second substrate 200. The

touch electrodes

220, 230, and 240 are used for sensing capacitance change caused by an object touch, and determining a touch position of the object, such as a finger or a stylus. In the present embodiment, the touch display panel 10 further has a second planarization layer 210. The second planarization layer 210 covers the

touch electrodes

220 and 230 and the second substrate 200. The second planarization layer 210 may be a single-layer or a dual-layer structure, and includes a third sub-planarization layer 212 and a fourth sub-planarization layer 214. The second flat layer 210 has a second opening 216 to expose a portion of the touch electrode 230, so that the touch electrode 240 is connected to the

touch electrodes

220 and 230.

In the present embodiment, the touch electrode 240 is disposed on the surface 215 of the fourth sub-planarization layer, and the touch electrode 240 can extend into the second opening 216 of the second planarization layer 210 to be electrically connected to the touch electrode 230, but the invention is not limited thereto, for example, the

touch electrodes

220, 230, and 240 can be integrally formed. In the present embodiment, the

touch electrodes

220, 230, and 240 are made of aluminum or silver, for example, in consideration of conductivity. However, the invention is not limited thereto, the material of the

touch electrodes

220, 230, and 240 may be metal, alloy, transparent conductive oxide, or a combination thereof, and the

touch electrodes

220, 230, and 240 may have a single-layer structure or a multi-layer stack structure.

In the present embodiment, the touch display panel 10 includes at least one raised structure 500. The padding structure 500 is disposed between the active device T and the sealant 300, and surrounds the display area AA. In the embodiment, as shown in fig. 2, the padding structure 500 is disposed in the non-display area BA, but the invention is not limited thereto, and the padding structure 500 may also be disposed in the display area AA. In the present embodiment, the padding structure 500 is located on the first substrate 100 and between the first substrate 100 and the conductive layer 160. For example, as shown in fig. 2, the raised structure 500 is formed on the first sub-planarization layer 132 and the conductive layer 160 covers the raised structure 500. In other words, the conductive layer 160 can conformally cover the elevated structure 500 and be formed between the first substrate 100 and the second substrate 200, and the conductive layer 160 contacts the touch electrode 240 at a position of the elevated structure 500 adjacent to the top surface 502 of the second substrate 200 to complete the electrical connection with the

touch electrodes

220, 230, 240, but the invention is not limited thereto.

Fig. 2B is a schematic partial cross-sectional view of a touch display panel according to another embodiment of the invention. Referring to fig. 2A and fig. 2B together, the touch display panel 10' of the present embodiment is similar to the touch display panel 10 of fig. 2A, but the main difference between the two is: the elevated structure 500 'of the present embodiment is formed on the second substrate 200 and located between the second substrate 200 and the touch electrode 240'. Specifically, the touch electrode 240 'conformally covers the raised structure 500' and is electrically connected to the

touch electrodes

220 and 230. The conductive layer 160 is formed on the first planarization layer 130, and the conductive layer 160 ' contacts the touch electrode 240 ' disposed on the top surface of the elevated structure 500 ' adjacent to the first substrate 100. The material of the raised structure 500' and the spacer 180 may be the same, but the invention is not limited thereto.

In the present embodiment, the touch display panel 10 further includes at least one signal pad 400. Referring to fig. 1 and fig. 2A, at least one signal pad 400 is disposed on the first substrate 100 and located in the non-display area BA. For example, the signal pads 400 are located on one side of the sealant 300 away from the display area AA and are adapted to be electrically connected to the wires 120 extending from the other side of the sealant 300 adjacent to the display area AA. For example: referring to fig. 2A, the conductive layer 160 is electrically connected to the conductive wires 120 and extends from a side adjacent to the display area AA to the non-display area BA at a side of the sealant 300 away from the display area AA to be electrically connected to the signal pads 400.

In the present embodiment, the touch display panel 10 is, for example, an organic light emitting diode display of top emission type, and the

touch electrodes

220 and 230 can transmit the sensed capacitance variation signal to the first substrate 100 through the touch electrode 240, and then lead the signal to the signal connection pad 400 in the non-display area BA. Therefore, the touch signal and the pixel signal can be integrated on the first substrate 100, thereby reducing the use of external components, saving the assembly space and reducing the cost. For example, the external device may be the flexible printed circuit 600, which includes, for example, the driving IC 620 and the pads 640 electrically connected to the signal pads 400 and the driving IC 620, but not limited thereto, the flexible printed circuit 600 may include only the pads 640 and wires for signal connection without the driving IC 620. In addition, in the present embodiment, the

touch electrodes

220, 230, and 240 may be made of metal, alloy, transparent conductive oxide, or a combination thereof, and the

touch electrodes

220, 230, and 240 may be a single-layer structure or a multi-layer stack structure, and the

touch electrodes

220, 230, and 240 may be integrally formed.

Fig. 3A is a schematic top view of a portion of a touch display panel according to an embodiment of the invention. Fig. 3B is a schematic partial cross-sectional view of the touch display panel shown in fig. 3A. For clarity, fig. 3A shows the first substrate 100, the display area AA, a non-display area BA surrounding the display area AA, the padding structure 500 and the sealant 300, and the illustration of the second substrate 200 and other components is omitted. In the present embodiment, the padding structure 500 is a discontinuous stripe pattern and is concentric with the sealant 300 to surround the display area AA, but the invention is not limited thereto. In other embodiments, the raised structure 500 may be a continuous pattern surrounding and encircling the display area AA.

In the present embodiment, referring to fig. 3A and 3B, the sealant 300 surrounds the display area AA, and the spacers 180 are disposed on the first substrate 100 and located in the display area AA. In the embodiment, the plurality of padding structures 500 are disposed in the non-display area BA around the display area AA, but the invention is not limited thereto. The padding structure 500 may also be located at the outermost edge of the display area AA and between the display area AA and the sealant 300. Referring to fig. 2A and fig. 3B, in the present embodiment, the sealant 300 has a second surface 302 closest to the inner surface 201 of the second substrate 200. When the elevated structure 500 is located between the first substrate 100 and the conductive layer 160, the conductive layer 160 covering the elevated structure 500 has a third surface 162 closest to the second substrate 200. For example, the third surface 162 is formed on the top surface 502 of the raised structure 500 closest to the second substrate 200. As shown in fig. 2A, the height from the third surface 162 to the first substrate 100 is substantially equal to the height from the second surface 302 to the first substrate 100, or, as shown in fig. 3B, the height from the third surface 162 to the first substrate 100 is substantially equal to the height from the second surface 302 to the first substrate 100. Therefore, the second substrate 200 can be reliably abutted against the raised structure 500, so as to improve the electrical connection contact effect between the conductive layer 160 on the raised structure 500 and the touch electrode 200 on the second substrate 200. In the present embodiment, the raised structure 500 and the conductive layer 160 are formed separately, but the raised structure 500 and the conductive layer 160 can also be formed simultaneously, i.e. the raised structure 500 and the conductive layer 160 are formed integrally.

Fig. 3C is a schematic partial cross-sectional view illustrating a touch display panel according to another embodiment of the invention. Referring to fig. 3B and fig. 3C together, the touch display panel 10' of the present embodiment is similar to the touch display panel 10 of fig. 3B, but the main difference between the two is: the elevated structure 500 'of the present embodiment is formed on the second substrate 200 and located between the second substrate 200 and the touch electrode 240'. Specifically, the elevated structure 500' has a height from the first surface 503 closest to the first surface 503 of the second substrate 200 to the first substrate 100 that is greater than or substantially equal to a height from the second surface 302 to the first substrate 100. For example, the first surface 503 of the elevated structure 500 'may be, for example, a surface of the elevated structure 500' close to the second substrate 200. Since the height of the first surface 503 is greater than or substantially equal to the height of the sealant 300 closest to the second surface 302 of the second substrate 200, the padding structure 500 'can reliably abut against the first substrate 100 and the second substrate 200, and the electrical connection reliability between the touch electrode 240' on the padding structure 500 'and the conductive layer 160' on the first substrate 100 is improved. In the present embodiment, the elevation structure 500 ' and the touch electrode 240 ' are formed separately, but the elevation structure 500 ' and the touch electrode 240 ' may also be formed simultaneously, that is, the elevation structure 500 ' and the touch electrode 240 are integrally formed.

Fig. 3D is a partially enlarged schematic view of the touch display panel shown in the region R of fig. 3A. Please refer to fig. 3A, 3B and 3D, in the present embodiment, the pad structures 500 are strip structures, and the distance k1 between each pad structure 500 and the sealant 300 is substantially equal. For example, referring to fig. 2A and fig. 3D, in the present embodiment, the spacing k1 is a distance from a side of the raised structure 500 closest to the sealant 300. Since each of the raised structures 500 is substantially equidistantly disposed from the sealant 300, in other words, each of the raised structures 500 is located at a position close to the gap (cell gap), the contact area between the conductive layer 160 on the raised structure 500 and the touch electrode 240 can be increased, and the effect of the touch signal can be increased.

Note that, the heightening structure 500 according to the embodiment of the present invention is preferably a strip, but the present invention is not limited thereto. When the pad-up structure 500 is a long strip, the contact area between the pad-up structure 500 and the conductive layer 160 on the pad-up structure 500 and the touch electrode 240 can be increased, so as to reduce the impedance between the conductive layer 160 and the touch electrode 240 and increase the effect of the touch signal.

It should be noted that, in the following embodiments, the reference numerals and partial contents of the elements in the foregoing embodiments are used, wherein the same reference numerals are used to indicate the same or similar elements, and the description of the portions with the same technical contents omitted may refer to the foregoing embodiments, and the description in the following embodiments is not repeated.

Fig. 4 is a schematic top view of a portion of a touch display panel according to another embodiment of the invention. Referring to fig. 3A and fig. 4 together, the touch display panel 10 ″ of the present embodiment is similar to the touch display panel 10 of fig. 3A, but the main differences are: in the present embodiment, the heightening structure 500 ″ includes a plurality of first ring structures 510 and a plurality of second ring structures 520. Specifically, compared to the second ring structure 520, the first ring structures 510 are adjacent to the display area AA, and a side of each first ring structure 510 closest to the sealant 300 has a first distance x (e.g., a distance d1) from the sealant 300. Compared to the first ring structures 510, a second distance y (e.g., the distance d2) is between the side of each second ring structure 520 closest to the sealant 300 and the sealant 300, where x and y are substantially constant and x ≠ y. In the embodiment, the first pitch x is greater than the second pitch y, that is, the distance d1 between each first ring structure 510 and the sealant 300 is greater than the distance d2 between each second ring structure 520 and the sealant 300, but the invention is not limited thereto. Under this configuration, the sealant 300 and the display area AA include a plurality of first ring structures 510 and second ring structures 520 disposed along the edge of the display area AA and concentric with the sealant 300, so that the number of the padding structures 500 ″ can be effectively increased, and the contact area between the conductive layer 160 (as shown in fig. 2A) on the padding structure 500 ″ and the touch electrode 240 can be increased, thereby reducing the impedance between the conductive layer 160 and the touch electrode 240 and increasing the effect of the touch signal. In addition, in the embodiment, only two circles of concentric ring-shaped first ring-shaped structures 510 and two circles of concentric ring-shaped structures 520 are selectively included, but the invention is not limited thereto, and more circles of concentric ring-shaped structures (for example, three circles, four circles, or more circles) may be designed according to actual requirements to further increase the reliability of the electrical connection between the conductive layer 160 and the touch electrode 240.

Fig. 5A is a schematic top view of a portion of a touch display panel according to another embodiment of the invention. Referring to fig. 3A and fig. 5A together, the touch display panel 10a of the present embodiment is similar to the touch display panel 10 of fig. 3A, but the main differences are: the raised structure 500a of the present embodiment is a continuous pattern, and is concentric with the sealant 300 to surround the display area AA. Under the above configuration, the padding structure 500a is a continuous strip structure, which can further increase the contact area, reduce the impedance between the conductive layer (not shown) and the touch electrode (not shown), and increase the effect of the touch signal compared to a discontinuous pattern.

Fig. 5B is a schematic top view of a portion of a touch display panel according to yet another embodiment of the invention. Referring to fig. 3A and fig. 5B together, the touch display panel 10B of the present embodiment is similar to the touch display panel 10 of fig. 3A, but the main difference therebetween is: the raised structure 500b of the present embodiment is a continuous pattern, and the raised structure 500b is a circular rectangle in a top view. Specifically, the shape of the raised structure 500b and the sealant 300b is a circular rectangle in a top view, and the raised structure 500b and the sealant 300b are concentric and circular to surround the display area AA. Under the configuration, the contact area can be further increased, the impedance between the conductive layer and the touch electrode can be reduced, and the effect of the touch signal can be increased.

In summary, the touch display panel according to an embodiment of the invention includes a first substrate, a second substrate disposed opposite to the first substrate, a plurality of active devices, a conductive layer disposed on the first substrate, a touch electrode disposed on the second substrate, a sealant, and at least one elevated structure disposed between the first substrate and the conductive layer or between the second substrate and the touch electrode. The heightening structures are arranged between the active elements and the frame glue and have a distance with the frame glue, and the distance between each heightening structure and the frame glue is substantially constant, so that each heightening structure is positioned at a position close to a gap (cell gap), and the contact area of the heightening structure and the second substrate or the first substrate can be increased. When the contact area of the padding structure is increased, the contact area of the conductive layer electrically connected with the touch electrode is also increased, so that the impedance between the conductive layer and the touch electrode is reduced, and the effect of a touch signal is increased. In addition, when the padding structure is a continuous pattern or the overlooking shape is a strip shape, the contact area can be further increased, the impedance between the conductive layer and the touch electrode is reduced, and the effect of a touch signal is improved.

The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A touch display panel having a display area and a non-display area surrounding the display area, the touch display panel comprising:

a first substrate;

a second substrate disposed opposite to the first substrate;

a plurality of active elements located between the first substrate and the second substrate and in the display region;

the frame glue is arranged between the first substrate and the second substrate and positioned in the non-display area, and surrounds the display area;

a touch electrode disposed on the second substrate;

a conductive layer disposed on the first substrate, the conductive layer being electrically connected to the touch electrode; and

at least one raising structure arranged between the active elements and the frame glue, the raising structure being located between the first substrate and the conductive layer or between the second substrate and the touch electrode, wherein the at least one raising structure has a certain distance with the frame glue; the at least one elevated structure surrounds the display area.

2. The touch display panel of claim 1, wherein the at least one raised structure is a continuous or discontinuous pattern.

3. The touch display panel according to claim 2, wherein the at least one raised structure comprises at least one first ring structure and at least one second ring structure, the at least one first ring structure and the sealant have a first distance x, the at least one second ring structure and the sealant have a second distance y, x and y are constant and x ≠ y.

4. The touch display panel of claim 1, further comprising:

at least one signal connecting pad electrically connected to the conductive layer, the at least one signal connecting pad disposed on the first substrate and located on a side of the sealant away from the display region.

5. The touch display panel of claim 1, wherein the at least one raised structure and the frame adhesive are concentric rings surrounding the display area.

6. The touch display panel of claim 1, wherein the at least one raised structure is a strip structure.

7. The touch display panel according to claim 1, wherein the at least one elevated structure is located between the second substrate and the touch electrode, the at least one elevated structure has a first surface closest to the second substrate, the sealant has a second surface closest to the second substrate, and a height of the first surface is greater than or equal to a height of the second surface.

8. The touch display panel according to claim 1, wherein the at least one elevating structure is located between the first substrate and the conductive layer, the conductive layer covering the at least one elevating structure has a third surface closest to the second substrate, the sealant has a second surface closest to the second substrate, and the height of the third surface is greater than or equal to the height of the second surface.

9. The touch display panel of claim 1, wherein the at least one raised structure is integrally formed with the conductive layer, or wherein the at least one raised structure is integrally formed with the touch electrode.