Patent Publication Number: US-2023157094-A1

Title: Display panel and display device

Description:
TECHNICAL FIELD 
     The present disclosure relates to a display device technology field, and more particularly to a display panel and a display device. 
     BACKGROUND 
     Since the development of OLED (Organic Light-Emitting Diode) display technology, OLED screens have various advantages, such as low energy consumption, a wide viewing angle, a wide color gamut, and a thin thickness when compared with LCD (Liquid Crystal Display) screens. Accordingly, the OLED screens are popularized rapidly. Currently, touch technology with the OLED display technology mainly includes an add-on touch film bonding scheme and On-Cell technology in which a touch layer is directly fabricated on a thin film encapsulation layer. 
     In the On-Cell technology, an add-on plate is not required. An optically clear adhesive (OCA) and a touch substrate are removed. As such, a module thickness is effectively decreased, and material cost is saved. The On-Cell technology has significant advantages when compared with the add-on touch technology. In particularly, waves of flexible touch displays emerge in recent years and push the On-Cell technology to develop and break through rapidly. The conventional OLED On-Cell technology is mainly based on mutual capacitance touch technology. However, since a thin film encapsulation layer of a display screen tends to be thinner, a distance between a touch layer and a cathode is getting closer and closer. This brings a great challenge for a touch driver chip. Furthermore, in a conventional pattern design of touch electrodes, since space occupied by touch signal lines is increased with closer to output terminals of lines, sizes of the touch electrode are getting smaller and smaller. Accordingly, touch sensitivity is decreased. 
     SUMMARY OF DISCLOSURE 
     An objective of the present disclosure is to provide a display panel and a display device to solve the problems that noises occur in touch signals and touch sensitivity of a touch layer is not high in the prior art. 
     To implement the above-mentioned objective, the present disclosure provides a display panel including an organic light-emitting structure layer, a touch layer, and a driver chip. The organic light-emitting structure layer includes a cathode. The touch layer is disposed on the organic light-emitting structure layer. 
     The touch layer includes a plurality of touch electrodes and a plurality of touch signal lines. The touch electrodes are disposed on the cathode in a matrix. A coupling capacitance is formed between each of the touch electrodes and the cathode. One terminal of each of the touch signal lines is connected to one of the touch electrodes. 
     The driver chip is disposed at one side of the display panel. The other terminal of each of the touch signal lines is connected to the driver chip. The driver chip is configured to acquire a signal of the coupling capacitance and determine whether a touch operation exists according to a change of the signal of the coupling capacitance. 
     Further, the touch layer further includes a dielectric layer. The dielectric layer is disposed between the touch electrodes and the touch signal lines. 
     Further, the organic light-emitting structure layer further includes a light-emitting layer and an encapsulation layer. The cathode is disposed between the light-emitting layer and the touch layer. The encapsulation layer is disposed between the cathode and the touch layer. 
     Further, the display function layer includes a plurality of sub pixels. The sub pixels are uniformly distributed in the display function layer. A gap is formed between two adjacent ones of the sub pixels. 
     Further, each of the touch electrodes includes metal mesh lines. An orthographic projection of the metal mesh lines falls within the gap of the display function layer. 
     Further, each of the touch signal lines is a wave-shaped structure and/or a chain-shaped structure. An orthographic projection of the wave-shaped structure and/or a chain-shaped structure falls within the gap of the display function layer. 
     Further, each of the touch signal lines includes a first metal line and a second metal line, and each of the touch electrodes is correspondingly connected to the first metal line or the second metal line. A line width of the first metal line is smaller than a line width of the second metal line. 
     Further, the touch electrodes close to the driver chip are connected to the first metal line, and the touch electrodes far away from the driver chip are connected to the second metal line. 
     Further, the touch layer further includes a protective layer. The protective layer covers the touch signal lines. 
     The present disclosure further provides a display device. The display device includes the above-mentioned display panel. 
     Advantageous effect is described as follows. In the display panel and the display device provided by the embodiments of the present disclosure, the touch electrodes and the touch signal lines are disposed in different layers, thereby reducing signals and effect between the touch electrodes and the touch signal lines, increasing the sensitivity of the touch layer, and enhancing user experience. Furthermore, the touch electrodes and the touch signals in the embodiments of the present disclosure are disposed to avoid the sub pixels which emit light, so that the light emitted by the organic light-emitting structure layer is not blocked, and display of an image is not affected. In the embodiments of the present disclosure, the touch signal lines having different line widths are used according to distances between the touch electrodes and the driver chip, thereby solving the problem that impedance differences are large when lengths of the touch signal lines are different. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       To describe the technical solutions of the embodiments of the present disclosure more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show only some embodiments of the present disclosure, and those skilled in the art may still derive other drawings from these accompanying drawings without creative efforts. 
         FIG.  1    illustrates a layer structure diagram of a display panel in accordance with Embodiments 1-3 of the present disclosure. 
         FIG.  2    illustrates a distribution diagram of sub pixels in the display panel in accordance with Embodiments 1-3 of the present disclosure. 
         FIG.  3    illustrates a distribution diagram of touch electrodes in the display panel in accordance with Embodiments 1-3 of the present disclosure. 
         FIG.  4    illustrates a structure diagram of a touch electrode and a touch signal line in accordance with Embodiment 1 or 3 of the present disclosure. 
         FIG.  5    illustrates a structure diagram of a touch electrode and a touch signal line in accordance with Embodiment 2 or 3 of the present disclosure. 
     
    
    
     Elements in the drawings are numbered as follows:
     display panel  1 ;   organic light-emitting structure layer  100 ; light-emitting layer  110 ;   cathode  120 ; encapsulation layer  130 ;   sub pixel  140 ; red sub pixel  141 ;   blue sub pixel  142 ; green sub pixel  143 ;   gap  150 ;   touch layer  200 ; touch electrode  210 ;   touch signal line  220 ; first metal line  221 ;   second metal line  222 ; dielectric layer  230     protective layer  240 ; driver chip  300 .   

     DETAILED DESCRIPTION OF EMBODIMENTS 
     The following description of every embodiment with reference to the accompanying drawings is used to exemplify a specific embodiment, which may be carried out in the present disclosure. The embodiments completely introduce the present disclosure for those skilled in the art, which make technology content clear and understand. The present disclosure embodies through different types of the embodiments. The protection range of the present disclosure is not limited in the embodiments of the present disclosure. 
     In the drawings, the components having similar structures are denoted by the same numerals. The structures and the components have similar function can use similar numerals to express. Thicknesses and sizes of the components in the drawings are randomly shown. The present disclosure does not limit to the thicknesses and the sizes of the components in the drawings. In order to make the drawings clear, the thicknesses of some components in the drawings are properly increased. 
     Additionally, description will be given by the preferred embodiments along with the accompanied drawings. It can be used to implement a specific embodiment. Direction terms are mentioned in the present disclosure, for example, “upper”, “lower”, “front”, “back”, “left”, “right”, “inside”, “outside”, “side” and so on, only refer to the direction of accompanied drawings. Thus, it is better and clearer to describe and understand the present invention by using direction terms, rather than implying the devices or elements are referred to a specific direction, and a structure or an operation with a specific direction. Therefore, it cannot be understood the limit of the present disclosure. Furthermore, terms “first”, “second”, “third” and the like are only are only for the purpose of description and are not to be construed as indicating or implicit relative importance. 
     When a certain component is described to be “on” another component, the component may be located directly on the another component. Also, there may exist an intermediate component, the component is located on the intermediate component, and the intermediate component is located on the another component. When a certain component is described to be “mounted on” or “connected to” another component, it may be construed to be directly “mounted on” or directly “connected to”. Alternatively, the component is “mounted on” or “connected to” the another component via an intermediate component. 
     Embodiment 1 
     An embodiment of the present disclosure provides a display device. The display device includes a display panel  1 . The display panel  1  provides a display image for the display device. The display device may be a display apparatus with a display function, for example, a mobile phone, a laptop, or a television. 
     As shown in  FIG.  1   , the display panel  1  includes an organic light-emitting structure layer  100 , a touch layer  200 , and a driver chip  300 . The touch layer  200  is disposed on one surface of the organic light-emitting structure layer  100 . The driver chip  300  is electrically coupled to the touch layer  200 . 
     The organic light-emitting structure layer includes a light-emitting layer  110 , a cathode  120 , and an encapsulation layer  130 . The light-emitting layer  110  includes a plurality of organic electroluminescent devices. The organic electroluminescent devices provide a light source for the display panel  1  to form a display image. The cathode  120  covers the light-emitting layer  110  and provides power for the light-emitting layer  110  to activate the organic electroluminescent devices to emit light. The encapsulation layer  130  is disposed to cover one surface of the cathode  120  far away from the light-emitting layer  110 . The encapsulation layer  130  adopts thin-film encapsulation (TFE) technology and is usually a sandwich-type encapsulation structure including an inorganic-organic-inorganic form. In this structure, inorganic layers guarantee stronger densification to block water and oxygen, and an organic layer guarantees flexibility of the display panel  1  to avoid the problem that the inorganic layers have cracks and peel off. 
     As shown in  FIG.  2   , the organic light-emitting structure layer  100  further includes a plurality of sub pixels  140 . Each of the sub pixels  140  includes a red sub pixel  141 , a blue sub pixel  142 , and a green sub pixel  143  which are uniformly distributed in the light-emitting layer  110 . The organic electroluminescent devices in the red sub pixels  141  can emit red light. The organic electroluminescent devices in the blue sub pixels  142  can emit blue light. The organic electroluminescent devices in the green sub pixels  143  can emit green light. The display panel  1  adopts the trichromatic theory to use the red light emitted by the red sub pixels  141 , the blue light emitted by the blue sub pixels  142 , the green light emitted by the green sub pixels  143  to form an image display panel. A gap  150  is formed between two adjacent ones of the sub pixels  140 . The gap  150  does not have a light-emitting function and is configured to separate the two adjacent ones of the sub pixels  140 . 
     As shown in  FIG.  1   , the touch layer  200  includes a plurality of touch electrodes  210  and a plurality of touch signal lines  220 . The touch signal lines  220  are disposed on one surface of the touch electrodes  210  far away from the encapsulation layer  130  and configured to sense touch signals. One terminal of each of the touch signal lines  220  is connected to one of the touch electrodes  210 , and the other terminal of each of the touch signal lines  220  is connected to the driver chip  300 . Each of the touch electrodes  210  is connected to a corresponding one of the touch signal lines  220 . The touch signals are configured to transmit the touch signals senses by the touch electrodes  210 . 
     In the embodiment of the present disclosure, the touch signal lines  220  are positioned on one surface of the touch electrodes  210  far away from the organic light-emitting structure layer  100 . However, in any other embodiment or embodiments, the present disclosure further provides a display panel and a display device which include touch signal lines  220  disposed between the touch electrodes  210  and the organic light-emitting structure layer  100 . Remaining layers and a connection structure are similar to the display panel  1  in Embodiment 1 of the present disclosure and thus not repeated herein. All other embodiments obtained by those skilled in the art based on the described embodiments of the present disclosure without the need for creative work are within the protection scope of the present disclosure. 
     As shown in  FIG.  3   , the touch electrodes  210  are disposed on the organic light-emitting structure layer  100  in a matrix. A width of each of the touch electrodes  210  is smaller than or equal to 7 millimeters (mm). Sizes of the touch electrodes  210  are uniform to guarantee sensitivity and accuracy. As shown in  FIG.  4   , each of the touch electrodes  210  includes metal mesh lines. Each of the touch signal lines  220  is a wave-shaped structure. As shown in  FIG.  2   , an orthographic projection of each of the lines of the touch electrodes  210  and an orthographic projection of each of the touch signal lines  220  fall within the gaps  150  of a display function layer. The lines of the touch electrodes  210  and the touch signal lines  220  are disposed in peripheries of the sub pixels  140  and do not block the sub pixels  140 , so that luminous efficiency of the organic light-emitting structure layer  100  is not affected. Furthermore, since the touch electrodes  210  are formed by the metal mesh lines, areas overlapped by the touch signal lines  220  and the touch electrodes  210  are quite small. As such, generated noises are small and do not interfere signal senses of the touch electrodes  210 , so that touch sensitivity can be further increased. 
     The touch layer  200  further includes a dielectric layer  230  and a protective layer  240 . As shown in  FIG.  1   , the dielectric layer  230  is disposed between the touch electrodes  210  and the touch signal lines  220  and configured to insulate the touch electrodes  210 . The touch signal lines  220  penetrate the dielectric layer  230  to connect to the touch electrodes  210 . The dielectric layer  230  includes an organic photoresist material, so that interference signals can be reduced when the touch signal lines  220  overlap with the touch electrodes  210 . The protective layer  240  covers the touch signal lines  220  and the dielectric layer  230  and is configured to insulate the touch signal lines  220 . The protective layer  240  includes an organic photoresist material or an inorganic material including at least one of silicon nitride and silica. 
     The driver chip  300  is disposed at one side of the display panel  1 . Each of the touch electrodes  210  independently leads to one of the touch signal lines  220  connected to the driver chip  300 . A coupling capacitance is formed between each of the touch electrodes  210  and the cathode  120  of the organic light-emitting structure layer  100 . The driver chip  300  is configured to acquire a signal of the coupling capacitance and determine whether a touch operation exists according to a change of the signal of the coupling capacitance. 
     In the display panel  1  and the display device provided by the embodiments of the present disclosure, the touch electrodes  210  and the touch signal lines  220  are disposed in different layers, thereby reducing signals and effect between the touch electrodes  210  and the touch signal lines  220 , increasing the sensitivity of the touch layer  200 , and enhancing user experience. Furthermore, the touch electrodes  210  and the touch signals in the embodiments of the present disclosure are disposed to avoid the sub pixels  140  which emit light, so that the light emitted by the organic light-emitting structure layer  100  is not blocked, and display of an image is not affected. 
     Embodiment 2 
     An embodiment of the present disclosure provides a display device. The display device includes a display panel  1 . The display panel  1  provides a display image for the display device. The display device may be a display apparatus with a display function, for example, a mobile phone, a laptop, or a television. 
     As shown in  FIG.  1   , the display panel  1  includes an organic light-emitting structure layer  100 , a touch layer  200 , and a driver chip  300 . The touch layer  200  is disposed on one surface of the organic light-emitting structure layer  100 . The driver chip  300  is electrically coupled to the touch layer  200 . 
     The organic light-emitting structure layer  100  includes a light-emitting layer  110 , a cathode  120 , and an encapsulation layer  130 . The light-emitting layer  110  includes a plurality of organic electroluminescent devices. The organic electroluminescent devices provide a light source for the display panel  1  to form a display image. The cathode  120  covers the light-emitting layer  110  and provides power for the light-emitting layer  110  to activate the organic electroluminescent devices to emit light. The encapsulation layer  130  is disposed to cover one surface of the cathode  120  far away from the light-emitting layer  110 . The encapsulation layer  130  adopts thin-film encapsulation (TFE) technology and is usually a sandwich-type encapsulation structure including an inorganic-organic-inorganic form. In this structure, inorganic layers guarantee stronger densification to block water and oxygen, and an organic layer guarantees flexibility of the display panel  1  to avoid the problem that the inorganic layers have cracks and peel off. 
     As shown in  FIG.  2   , the organic light-emitting structure layer  100  further includes a plurality of sub pixels  140 . Each of the sub pixels  140  includes a red sub pixel  141 , a blue sub pixel  142 , and a green sub pixel  143  which are uniformly distributed in the light-emitting layer  110 . The organic electroluminescent devices in the red sub pixels  141  can emit red light. The organic electroluminescent devices in the blue sub pixels  142  can emit blue light. The organic electroluminescent devices in the green sub pixels  143  can emit green light. The display panel  1  adopts the trichromatic theory to use the red light emitted by the red sub pixels  141 , the blue light emitted by the blue sub pixels  142 , the green light emitted by the green sub pixels  143  to form an image display panel. A gap  150  is formed between two adjacent ones of the sub pixels  140 . The gap  150  does not have a light-emitting function and is configured to separate the two adjacent ones of the sub pixels  140 . 
     As shown in  FIG.  1   , the touch layer  200  includes a plurality of touch electrodes  210  and a plurality of touch signal lines  220 . The touch signal lines  220  are disposed on one surface of the touch electrodes  210  far away from the encapsulation layer  130  and configured to sense touch signals. One terminal of each of the touch signal lines  220  is connected to one of the touch electrodes  210 , and the other terminal of each of the touch signal lines  220  is connected to the driver chip  300 . Each of the touch electrodes  210  is connected to a corresponding one of the touch signal lines  220 . The touch signals are configured to transmit the touch signals senses by the touch electrodes  210 . 
     In the embodiment of the present disclosure, the touch signal lines  220  are positioned on one surface of the touch electrodes  210  far away from the organic light-emitting structure layer  100 . However, in any other embodiment or embodiments, the present disclosure further provides a display panel and a display device which include touch signal lines  220  disposed between the touch electrodes  210  and the organic light-emitting structure layer  100 . Remaining layers and a connection structure are similar to the display panel  1  in Embodiment 1 of the present disclosure and thus not repeated herein. All other embodiments obtained by those skilled in the art based on the described embodiments of the present disclosure without the need for creative work are within the protection scope of the present disclosure. 
     As shown in  FIG.  3   , the touch electrodes  210  are disposed on the organic light-emitting structure layer  100  in a matrix. A width of each of the touch electrodes  210  is smaller than or equal to 7 millimeters (mm). Sizes of the touch electrodes  210  are uniform to guarantee sensitivity and accuracy. As shown in  FIG.  5   , each of the touch electrodes  210  includes metal mesh lines. Each of the touch signal lines  220  is a chain-shaped structure. As shown in  FIG.  2   , an orthographic projection of each of the lines of the touch electrodes  210  and an orthographic projection of each of the touch signal lines  220  fall within the gaps  150  of a display function layer. The lines of the touch electrodes  210  and the touch signal lines  220  are disposed in peripheries of the sub pixels  140  and do not block the sub pixels  140 , so that luminous efficiency of the organic light-emitting structure layer  100  is not affected. Furthermore, since the touch electrodes  210  are formed by the metal mesh lines, areas overlapped by the touch signal lines  220  and the touch electrodes  210  are quite small. As such, generated noises are small and do not interfere signal senses of the touch electrodes  210 , so that touch sensitivity can be further increased. 
     The touch layer  200  further includes a dielectric layer  230  and a protective layer  240 . As shown in  FIG.  1   , the dielectric layer  230  is disposed between the touch electrodes  210  and the touch signal lines  220  and configured to insulate the touch electrodes  210 . The touch signal lines  220  penetrate the dielectric layer  230  to connect to the touch electrodes  210 . The dielectric layer  230  includes an organic photoresist material, so that interference signals can be reduced when the touch signal lines  220  overlap with the touch electrodes  210 . The protective layer  240  covers the touch signal lines  220  and the dielectric layer  230  and is configured to insulate the touch signal lines  220 . The protective layer  240  includes an organic photoresist material or an inorganic material including at least one of silicon nitride and silica. 
     The driver chip  300  is disposed at one side of the display panel  1 . Each of the touch electrodes  210  independently leads to one of the touch signal lines  220  connected to the driver chip  300 . A coupling capacitance is formed between each of the touch electrodes  210  and the cathode  120  of the organic light-emitting structure layer  100 . The driver chip  300  is configured to acquire a signal of the coupling capacitance and determine whether a touch operation exists according to a change of the signal of the coupling capacitance. 
     In the display panel  1  and the display device provided by the embodiments of the present disclosure, the touch electrodes  210  and the touch signal lines  220  are disposed in different layers, thereby reducing signals and effect between the touch electrodes  210  and the touch signal lines  220 , increasing the sensitivity of the touch layer  200 , and enhancing user experience. Furthermore, the touch electrodes  210  and the touch signals in the embodiments of the present disclosure are disposed to avoid the sub pixels  140  which emit light, so that the light emitted by the organic light-emitting structure layer  100  is not blocked, and display of an image is not affected. 
     Embodiment 3 
     An embodiment of the present disclosure provides a display device. The display device includes a display panel  1 . The display panel  1  provides a display image for the display device. The display device may be a display apparatus with a display function, for example, a mobile phone, a laptop, or a television. 
     As shown in  FIG.  1   , the display panel  1  includes an organic light-emitting structure layer  100 , a touch layer  200 , and a driver chip  300 . The touch layer  200  is disposed on one surface of the organic light-emitting structure layer  100 . The driver chip  300  is electrically coupled to the touch layer  200 . 
     The organic light-emitting structure layer  100  includes a light-emitting layer  110 , a cathode  120 , and an encapsulation layer  130 . The light-emitting layer  110  includes a plurality of organic electroluminescent devices. The organic electroluminescent devices provide a light source for the display panel  1  to form a display image. The cathode  120  covers the light-emitting layer  110  and provides power for the light-emitting layer  110  to activate the organic electroluminescent devices to emit light. The encapsulation layer  130  is disposed to cover one surface of the cathode  120  far away from the light-emitting layer  110 . The encapsulation layer  130  adopts thin-film encapsulation (TFE) technology and is usually a sandwich-type encapsulation structure including an inorganic-organic-inorganic form. In this structure, inorganic layers guarantee stronger densification to block water and oxygen, and an organic layer guarantees flexibility of the display panel  1  to avoid the problem that the inorganic layers have cracks and peel off. 
     As shown in  FIG.  2   , the organic light-emitting structure layer  100  further includes a plurality of sub pixels  140 . Each of the sub pixels  140  includes a red sub pixel  141 , a blue sub pixel  142 , and a green sub pixel  143  which are uniformly distributed in the light-emitting layer  110 . The organic electroluminescent devices in the red sub pixels  141  can emit red light. The organic electroluminescent devices in the blue sub pixels  142  can emit blue light. The organic electroluminescent devices in the green sub pixels  143  can emit green light. The display panel  1  adopts the trichromatic theory to use the red light emitted by the red sub pixels  141 , the blue light emitted by the blue sub pixels  142 , the green light emitted by the green sub pixels  143  to form an image display panel. A gap  150  is formed between two adjacent ones of the sub pixels  140 . The gap  150  does not have a light-emitting function and is configured to separate the two adjacent ones of the sub pixels  140 . 
     As shown in  FIG.  1   , the touch layer  200  includes a plurality of touch electrodes  210  and a plurality of touch signal lines  220 . The touch signal lines  220  are disposed on one surface of the touch electrodes  210  far away from the encapsulation layer  130  and configured to sense touch signals. One terminal of each of the touch signal lines  220  is connected to one of the touch electrodes  210 , and the other terminal of each of the touch signal lines  220  is connected to the driver chip  300 . Each of the touch electrodes  210  is connected to a corresponding one of the touch signal lines  220 . The touch signals are configured to transmit the touch signals senses by the touch electrodes  210 . 
     In the embodiment of the present disclosure, the touch signal lines  220  are positioned on one surface of the touch electrodes  210  far away from the organic light-emitting structure layer  100 . However, in any other embodiment or embodiments, the present disclosure further provides a display panel and a display device which include touch signal lines  220  disposed between the touch electrodes  210  and the organic light-emitting structure layer  100 . Remaining layers and a connection structure are similar to the display panel  1  in Embodiment 1 of the present disclosure and thus not repeated herein. All other embodiments obtained by those skilled in the art based on the described embodiments of the present disclosure without the need for creative work are within the protection scope of the present disclosure. 
     As shown in  FIG.  3   , the touch electrodes  210  are disposed on the organic light-emitting structure layer  100  in a matrix. A width of each of the touch electrodes  210  is smaller than or equal to 7 millimeters (mm). Sizes of the touch electrodes  210  are uniform to guarantee sensitivity and accuracy. As shown in  FIG.  4    and  FIG.  5   , each of the touch electrodes  210  includes metal mesh lines. Each of the touch signal lines  220  includes a first metal line  221  and a second metal line  222 , and each of the touch electrodes  210  is correspondingly connected to the first metal line  221  or the second metal line  222 . As shown in  FIG.  4   , the first metal line  221  is a wave-shaped structure. As shown in  FIG.  5   , the second metal line  222  is a chain-shaped structure. A line width of the first metal line  221  is smaller than a line width of the second metal line  222 . The touch electrodes  210  close to the driver chip  300  are connected to the first metal line  221 , and the touch electrodes  210  far away from the driver chip  300  are connected to the second metal line  222 . 
     As shown in  FIG.  5   , an orthographic projection of each of the lines of the touch electrodes  210  and an orthographic projection of each of the touch signal lines  220  fall within the gaps  150  of a display function layer. The lines of the touch electrodes  210  and the touch signal lines  220  are disposed in peripheries of the sub pixels  140  and do not block the sub pixels  140 , so that luminous efficiency of the organic light-emitting structure layer  100  is not affected. Furthermore, since the touch electrodes  210  are formed by the metal mesh lines, areas overlapped by the touch signal lines  220  and the touch electrodes  210  are quite small. As such, generated noises are small and do not interfere signal senses of the touch electrodes  210 , so that touch sensitivity can be further increased. 
     The touch layer  200  further includes a dielectric layer  230  and a protective layer  240 . As shown in  FIG.  1   , the dielectric layer  230  is disposed between the touch electrodes  210  and the touch signal lines  220  and configured to insulate the touch electrodes  210 . The touch signal lines  220  penetrate the dielectric layer  230  to connect to the touch electrodes  210 . The dielectric layer  230  includes an organic photoresist material, so that interference signals can be reduced when the touch signal lines  220  overlap with the touch electrodes  210 . The protective layer  240  covers the touch signal lines  220  and the dielectric layer  230  and is configured to insulate the touch signal lines  220 . The protective layer  240  includes an organic photoresist material or an inorganic material including at least one of silicon nitride and silica. 
     The driver chip  300  is disposed at one side of the display panel  1 . Each of the touch electrodes  210  independently leads to one of the touch signal lines  220  connected to the driver chip  300 . A coupling capacitance is formed between each of the touch electrodes  210  and the cathode  120  of the organic light-emitting structure layer  100 . The driver chip  300  is configured to acquire a signal of the coupling capacitance and determine whether a touch operation exists according to a change of the signal of the coupling capacitance. 
     In the display panel  1  and the display device provided by the embodiments of the present disclosure, the touch electrodes  210  and the touch signal lines  220  are disposed in different layers, thereby reducing signals and effect between the touch electrodes  210  and the touch signal lines  220 , increasing the sensitivity of the touch layer  200 , and enhancing user experience. Furthermore, the touch electrodes  210  and the touch signals in the embodiments of the present disclosure are disposed to avoid the sub pixels  140  which emit light, so that the light emitted by the organic light-emitting structure layer  100  is not blocked, and display of an image is not affected. In the embodiments of the present disclosure, the touch signal lines  220  having different line widths are used according to distances between the touch electrodes  210  and the driver chip  300 , thereby solving the problem that impedance differences are large when lengths of the touch signal lines  220  are different. 
     Although the present disclosure is described with reference to specific embodiments, it can be understood that these embodiments are merely examples of the principles and applications of the present disclosure. Hence, it can be understood that numerous modifications can be made to the embodiments, and other arrangements can be made, as long as they do not go beyond the spirit and scope of the present disclosure as defined by the appended claims. It can be understood that different dependent claims and features described herein can be combined in a manner different from those described in the initial claims. It can also be understood that the technical features described in one embodiment can also be used in other embodiments.