Patent Publication Number: US-2018052551-A1

Title: Sensing display panel

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefits of a U.S. provisional application Ser. No. 62/375,904, filed on Aug. 17, 2016 and a Taiwan application serial no. 106105640, filed on Feb. 20, 2017. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein. 
    
    
     TECHNICAL FIELD 
     The disclosure relates to a sensing display panel. 
     BACKGROUND 
     A sensing display panel includes a display panel and a sensing panel. The sensing panel may be built in the display panel or attached onto the display panel. Based on different sensing types, sensing panels may be generally categorized into resistive sensing panels, capacitive sensing panels, optical sensing panels, acoustic-wave sensing panels and electromagnetic sensing panels. For instance, the resistive sensing panel and the capacitive sensing panel are designed to drive and sensed by two electrodes that are insulated from each other. 
     Generally, due to the reflective optical property of an electrode or a medium, ambient light may result in reflection on the appearance of a sensing display panel. Thus, the color quality of light beams with colors displayed on the sensing display panel may be affected. Currently, one of options for facilitating the color quality of the light beams with colors displayed on the sensing display panel includes eliminating the reflection of ambient light by attaching a polarizing film or a retardation film on a sensing surface of the sensing display panel. 
     SUMMARY 
     A sensing display panel according to an embodiment of the present disclosure includes a display panel, a buffer layer, a sensing panel, and a plurality of first connection electrodes. The display panel includes a first substrate and a reflective layer-disposed on the first substrate. The buffer layer has a first surface and a second surface opposite to the first surface, wherein the display panel is disposed on the first surface. The sensing display has a sensing surface disposed on the second surface of the buffer layer. The sensing display includes at least one filter layer, a gray film, and a sensing device layer. The light transmitted from the sensing surface toward the sensing panel, the buffer layer, and the display panel is reflected by the reflective layer. The sensing device layer includes at least one first conductive layer and at least one second conductive layer, and the first and the second conductive layers are electrically insulated from each other. The plurality of first connection electrodes are disposed on the second surface of the buffer layer or the first substrate of the display panel, and the plurality of first connection electrodes electrically connect to the at least one first conductive layer and the at least one second conductive layer, respectively. 
     A sensing display panel according to another embodiment of the present disclosure includes a display panel, a buffer layer, and a sensing panel. The display panel includes a first substrate and a reflective layer disposed on the first substrate. The buffer layer has a first surface and a second surface opposite to the first surface, and the display panel is disposed on the first surface. The sensing display has a sensing surface disposed on the second surface of the buffer layer. The sensing display includes at least one filter layer and a sensing device layer. A light transmitted from the sensing surface toward the sensing panel, the buffer layer, and the display panel is reflected by the reflective layer. An optical density ratio between the buffer layer and the at least one filter layer with respect to visible light is N, and N is greater than 1 and less than or equal to 40. 
     Several exemplary embodiments accompanied with figures are described in detail below to further describe the disclosure in details. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic cross-sectional view illustrating a sensing display panel according to a first embodiment of the disclosure. 
         FIG. 2A  is a schematic top view illustrating a sensing display panel according to a second embodiment of the disclosure. 
         FIG. 2B  is a schematic top view illustrating a sensing display panel according to an embodiment of the disclosure. 
         FIG. 2C  is a schematic top view illustrating a sensing display panel according to another embodiment of the disclosure. 
         FIG. 2D  is a schematic top view illustrating a sensing display panel according to another embodiment of the disclosure. 
         FIG. 3  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a third embodiment of the disclosure. 
         FIG. 4  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a fourth embodiment of the disclosure. 
         FIG. 5  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a fifth embodiment of the disclosure. 
         FIG. 6  is a schematic bottom view illustrating a sensing panel of a sensing display panel according to a sixth embodiment of the disclosure. 
         FIG. 7  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a seventh embodiment of the disclosure. 
         FIG. 8  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to an eighth embodiment of the disclosure. 
         FIG. 9  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a ninth embodiment of the disclosure. 
         FIG. 10  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a tenth embodiment of the disclosure. 
         FIG. 11  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to an eleventh embodiment of the disclosure. 
         FIG. 12  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a twelfth embodiment of the disclosure. 
         FIG. 13  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a thirteenth embodiment of the disclosure. 
         FIG. 14  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a fourteenth embodiment of the disclosure. 
         FIG. 15A ˜ FIG. 15C  are schematic cross-sectional views illustrating various arrangements of a color filter layer cooperated with the sensing display panel shown in  FIG. 1 , respectively, according to a fifteenth embodiment of the disclosure. 
         FIG. 16  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a sixteenth embodiment of the disclosure. 
         FIG. 17  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a seventeenth embodiment of the disclosure. 
         FIG. 18  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to an eighteenth embodiment of the disclosure. 
         FIG. 19  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a nineteenth embodiment of the disclosure. 
         FIG. 20  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a twentieth embodiment of the disclosure. 
         FIG. 21  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel according to a twenty-first embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS 
     Below, exemplary embodiments will be described in detail with reference to accompanying drawings so as to be easily realized by a person having ordinary knowledge in the art. The inventive concept may be embodied in various forms without being limited to the exemplary embodiments set forth herein. Descriptions of well-known parts are omitted for clarity, and like reference numerals refer to like elements throughout. 
       FIG. 1  is a schematic cross-sectional view illustrating a sensing display panel according to a first embodiment of the disclosure. In  FIG. 1 , the sensing display panel  10  of this embodiment may comprise a display panel  20 , a buffer layer  30 , a sensing panel  100 , and a plurality of connection electrodes. The display panel  20  may have a light emitting region  26 . The light emitting region  26  is located on a second substrate  22  and includes a plurality of first light emitting regions  26   a,  a plurality of second light emitting regions  26   b,  and a plurality of third light emitting regions  26   c.  In this embodiment, the first light emitting regions  26   a,  the second light emitting regions  26   b,  the third light emitting regions  26   c  respectively emit lights of different colors (for example, red light, blue light, and green light). Taking pixels of three primary colors as an example, a pixel at least includes a red sub-pixel having the first light emitting region  26   a,  at least one green sub-pixel having the second light emitting region  26   b,  and at least one blue sub-pixel having the third light emitting region  26   c.    
     The display panel  20  may have a reflective layer  281 . The reflective layer  281  may be a reflective conductive material or a transflective conductive material capable of reflecting light and used as an electrode in the display panel  20 . In an embodiment, the reflective layer  281  may be a reflective film or a transflective film without the property of being electrically conductive. In other embodiments, the reflective layer  281  may also be formed by films stacked with each other, so as to reflect light by utilizing the difference in refractive index between films. In this embodiment, the reflective layer  281  may be provided as a second electrode  28  of the display panel  20  and distributed on the second substrate  22  comprehensively. A light emitting layer  261  is an organic light emitting material, for example. In addition, a first electrode  24 , the light emitting layer  261 , and the second electrode  28  may form a structure having a micro-cavity, for example, so as to improve the light emitting efficiency and the coherence of light in the light emitting region  26 . In this embodiment, a material of the first electrode  24  may include indium tin oxide (ITO), and a material of the second electrode  28  may include a magnesium-silver alloy, for example. However, the scope of the disclosure is not limited thereto. 
     The buffer layer  30  has a first surface  30   a  and a second surface  30   b  opposite to the first surface  30   a.  Also, the display panel  20  is disposed on the first surface  30   a,  and sensing panel  100  is disposed on the second surface  30   b  of the buffer layer. In detailed, the buffer layer  30  is located between the display panel  20  and the sensing panel  100 . In an embodiment, the buffer layer  30  may have an adhesive property to adhere the display panel  20  and the sensing panel  100  to form the sensing display panel  10 . 
     The sensing panel  100  has a sensing surface  100 S, and the sensing panel  100  may include a sensing device layer  120 , at least one filter layer  130 , and a gray film  140 . Light transmitted from the sensing surface  100 S toward the sensing panel  100 , the buffer layer  30 , and the display panel  20  may be reflected by the reflective layer  281 . That is, after the light emitted by the light emitting region  26  of the display panel  20  passes through the sensing panel  100 , the outside world may observe images generated by the display panel  20  through the sensing surface  100 S of the sensing panel  100 . Ambient light L may also enter the sensing panel  100  and the display panel  20  from the sensing surface  100 S. The ambient light L entering the display panel  20  may be reflected by the reflective layer  281  in the display panel  20  and emitted from the sensing surface  100 S of the sensing panel  100 . The light emitted by the light emitting region  26  of the display panel  20 , the ambient light L entering the display panel  20 , and the ambient light L reflected by the reflective layer  281  of the display panel  20  may be absorbed by the gray film  140  and/or the filter layer  130  to reduce the reflected light of the ambient light L emitted from the sensing surface  100 S. In an embodiment, an optical density ratio between the filter layer  130  and the gray film  140  with respect to visible light is N, and N is greater than 1 and less than or equal to 40. In other words, compared with the gray film  140 , the filter layer  130  exhibits a higher light blocking effect, or the gray film  140  exhibits a higher light transmittance than that of the filter layer  130 . 
     The sensing device layer  120  is configured to detect a signal which is generated when the user touches the sensing display panel  10 . Such a signal may be a change of capacitance, a change of resistance, or the like. Taking capacitive sensing as an example, when the user touches the sensing display panel  10 , the sensing device layer  120  may generate a change of capacitance in a touched region of the sensing device layer  120 . The change of capacitance may be detected and identified by a controller (not shown) connected to the sensing device layer  120 . In this embodiment, the sensing panel  100  may further include a dielectric layer  150 , wherein the dielectric layer  150  includes a first dielectric layer  152 , a second dielectric layer  154 , and a third dielectric layer  156 . The sensing device layer  120  includes at least one first conductive layer  122  and at least one second conductive layer  124  electrically insulated from each other, wherein the first dielectric layer  152  is located between the first conductive layer  122  and the second conductive layer  124 , so that the first conductive layer  122  and the second conductive layer  124  are electrically insulated from each other. The second dielectric layer  154  is formed between the at least one second conductive layer  124  and the at least one filter layer  130 , and is formed between the at least one second conductive layer  124 . The second dielectric layer  154  may be configured to separate the at least one second conductive layer  124  from the at least one filter layer  130 , and each of the at least one second conductive layer  124  is separated by the second dielectric layer  154 . The third dielectric layer  156  is formed between the at least one filter layer  130  and the gray film  140 , and is formed between the at least one filter layer  130 . The third dielectric layer  156  may be configured to separate the at least one filter layer  130  from the gray fill  140 , and the at least one filter layer  130  is separated from each other by the third dielectric layer  156 . The first conductive layer  122  and the second conductive layer  124  have different extending directions (D 1  and D 3 ), respectively. In an embodiment, a ratio between the coverage area of the sensing device layer  120  in a direction D 2  and the projected overlap area of the at least one filter layer  130  is greater than or equal to 70%, for example. 
     In an embodiment, the first dielectric layer  152 , the second dielectric layer  154 , or the third dielectric layer  156  may be made of inorganic materials. The inorganic materials may include SiOx, SiNx, SiON, AlOx, AlON, or other similar materials. In addition, the first dielectric layer  152 , the second dielectric layer  154 , or the third dielectric layer  156  may be made of organic materials. The organic materials may include polyimide (PI), polycarbonate (PC), polyamide (PA), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylenimine (PEI), polyurethane (PU), polydimethylsiloxane (PDMS), an acrylic-based polymer (for example, polymethylmethacrylate, PMMA), an ether-based polymer (for example, polyethersulfone, PES or polyetheretherketone, PEEK), polyolefin, other similar materials, or a combination thereof. In other embodiments, the first dielectric layer  152 , the second dielectric layer  154 , or the third dielectric layer  156  may be formed by alternately stacking organic and inorganic layers, or formed of a hybrid material of organic and inorganic materials. 
     In this embodiment, the filter layers  130  may be located between the sensing device layer  120  and the gray film  140 . The sub-pixels may be arranged as an array, and a pitch is maintained between any two adjacent pixels. The disposed positions of the at least one filter layer  130  may correspond to positions between the sub-pixels to avoid light leakage. Moreover, the at least one filter layers  130  of the sensing panel  100  may locally shield the light reflected by the reflective layer  281  of the display panel  20  to improve the display quality of the sensing display panel  10 . Furthermore, the filter layers  130  of the sensing panel  100  may also locally shield the light entering the sensing panel  100  from the sensing surface  100 S to improve the display quality of the sensing display panel  10 . In an embodiment, the at least one filter layer  130  may be a black matrix (BM). For example, the black matrix may be manufactured by forming a BM material layer and then performing a patterning process on the BM material layer. A material of the black matrix may be, for example, a filter resin, and the patterned BM may be formed by performing a photolithography process. The material of the BM may also be chromium metal or other metals having a light absorbing property, and the patterned BM may be formed by performing a photolithography process and an etching process. In other embodiments, the at least one filter layer  130  may be a filter ink layer. For example, the BM may be formed by printing a polyester-based ink having a filter property. 
     In this embodiment, the gray film  140  may be distributed on the at least one filter layer  130  comprehensively, and the gray film  140  absorbs a part of the light. In more detailed, one part of the light emitted from the light emitting region  26  of the display panel  20  will be transmitted through the gray film  140 , while another part of the emitted light will be absorbed by the gray film  140 . A transmittance rate of the gray film  140  may be adjusted by changing a material or a thickness of the gray film  140 . Moreover, the gray film  140  of the sensing panel  100  may absorb the light leaked of the sensing display panel  10 , so as to reinforce the display quality of the sensing display panel  10 . In an embodiment, the material of the gray film  140  may include metal, and the gray film  140  may be formed by a sputtering method or an evaporation method. In other embodiments, the gray film  140  may be formed by applying nanoparticles of metal or metal oxide and performing a sputtering method, an evaporation method, a coating method, or a sol-gel method. In an embodiment, the material of the gray film  140  includes a carbon-based material. The gray film  140  may be formed by encapsulating carbon powder, carbon-containing particles, or carbon black pigment with acrylic or other media. In other embodiments, the material of the gray film  140  includes a silicon-doped carbon-based material, and the gray film  140  may be formed by performing a chemical vapor deposition (CVD) process. 
     In this embodiment, the sensing panel  100  may further include a first substrate  110 , and the sensing device layer  120 , the filter layers  130 , and the gray film  140  are disposed on the first substrate  110 . The first substrate  110  may be a rigid or flexible substrate allowing transmittance of visible light. For example, a materials of the rigid substrate may include glass or other rigid materials, and materials of the flexible substrate may include polyethylene terephthalate (PET), polyimide (PI), polycarbonate (PC), polyamide (PA), polyethylene naphthalate (PEN), polyethylenimine (PEI), polyurethane (PU), polydimethylsiloxane (PDMS), an acrylic-based polymer (for example, polymethylmethacrylate, PMMA), an ether-based polymer (for example, polyethersulfone, PES or polyetheretherketone, PEEK), polyolefin, or other flexible materials. However, the scope of the disclosure is not limited thereto. The first substrate  110  may further include an inorganic particle, such as silica, alumina, zirconium oxide, vanadium oxide, chromium oxide, iron oxide, antimony oxide, tin oxide, titania, or a combination thereof. 
     In an embodiment, the dielectric layer  150  may have a flat surface to let devices formed subsequently be formed on the flat surface. In other embodiments, the dielectric layer  150  may serve to block permeation of oxygen and/or moisture. For instance, the rigid sensing display panel  10  may block the oxygen and/or moisture by the rigid substrate to prevent the damages of the sensing panel  100  or the display panel  20 . However, a blocking ability of the flexible substrate made of the flexible material may not suffice to satisfy blocking requirements of the sensing panel  100  or the display panel  20  during the packaging process. Under such a circumstance, the dielectric layer  150  capable of blocking the permeation of oxygen and/or moisture, for example, may be used to prevent oxygen and/or moisture to affect the sensing panel  100  or the display panel  20 . In addition to the dielectric layer  150 , the gray film  140  may also have a blocking ability. Based on the needs, the dielectric layer  150  or the gray film  140  may be disposed between the layers described in the embodiments of the disclosure, respectively. 
     In this embodiment, the plurality of first connection electrodes  40  are disposed on and in contact with the first substrate  110 . One end of each of the plurality of first connection electrodes  40  electrically connects to the first conductive layer  122  and the second conductive layer  124  of the sensing panel  100 , respectively, and the other end of each of the plurality of first connection electrodes  40  may be subsequently bonded to a circuit board  41  (for example, a flexible circuit board, FPC). Further, the display panel  20  may further include a plurality of second connection electrodes  25  disposed on and in contact with the second substrate  22 . One end of each of the plurality of second connection electrodes  25  respectively electrically connects to the first electrode  24  and the second electrode  28  of the display panel  20 , and the other end of each of the plurality of second connection electrodes  25  may be subsequently bonded to a circuit board  21  (for example, a flexible circuit board, FPC), wherein the circuit boards  21  and  41  have the same bonding direction. In another embodiment, the first substrate  110  may be removed and the sensing panel  100  is formed on and in contact with the second surface  30   b  of the buffer layer  30 . One end of each of the plurality of first connection electrodes  40  electrically connects to the first conductive layer  122  and the second conductive layer  124  of the sensing panel  100 , respectively, and extends to the second substrate  22  of the display panel  20 . The other end of each of the plurality of first connection electrodes  40  may be subsequently bonded to the circuit board  21  (for example, a flexible circuit board, FPC), that is, the plurality of first connection electrodes  40  and the plurality of second connection electrodes  25  may share the bonding area. Based on the needs, the method of respectively bonding the plurality of first connection electrodes  40  and the plurality of second connection electrodes  25  to the circuit boards  21 ,  41  may be cooperatively used in each of the embodiments of the disclosure. 
     In an embodiment, the hardness of the filter layer  130  or the gray film  140  may be higher than 1 H, for example, to provide an anti-scratch function. In addition, the sensing display panel  10  may further include a protection structure disposed on the sensing surface  100 S. The material of the protection structure may be, but not limited to reinforced glass or quartz glass, and the hardness of the protection structure may be higher than 1 H, for example, to prevent abrasion or impact to the sensing panel  100 . 
     In embodiments of the disclosure,  FIG. 2A ˜ FIG. 2D  illustrate configurations of disposition for the plurality of first connection electrodes  40  and the plurality of second connection electrodes  25 , respectively.  FIG. 2A  is a schematic top view illustrating a sensing display panel  10 A according to a second embodiment of the disclosure.  FIG. 2B  is a schematic top view illustrating a sensing display panel  10 B according to an embodiment of the disclosure.  FIG. 2C  is a schematic top view illustrating a sensing display panel  10 C according to another embodiment of the disclosure.  FIG. 2D  is a schematic top view illustrating a sensing display panel  10 D according to another embodiment of the disclosure. Referring to  FIG. 2A , the plurality of first connection electrodes  40  and the plurality of second connection electrodes  25  may be disposed adjacently and on the same side of the sensing display panel  10 A. In other embodiments, the plurality of first connection electrodes  40  and the plurality of second connection electrodes  25  may be interleaved and located on the same side of the sensing display panels  10 B and  10 C, as shown in  FIGS. 2B and 2C . In an embodiment, the plurality of first connection electrodes  40  and the plurality of second connection electrodes  25  may be disposed on different sides of the sensing display panel  10 D, respectively, as shown in  FIG. 2D . 
     In the following, different embodiments are provided to describe the sensing display panel. For a detailed description of omitted parts, reference may be found in the previous embodiments, and no repeated description is contained in the following embodiments. 
       FIG. 3  is a schematic cross-sectional view illustrating a sensing panel  300  of a sensing display panel according to a third embodiment of the disclosure. In  FIG. 3 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 1  will not be described in the following. In this embodiment, filter layers  330  of the sensing panel  300  are located on the sensing device layer  120 . A gray film  340  is formed between the second conductive layers  124  and the filter layers  330 , and between the second conductive layers  124 . The gray film  340  may be configured to separate the second conductive layers  124  from the filter layers  330 , and each of the second conductive layers  124  is separated by the gray film  340 . The second conductive layers  124  and the filter layers  330  are separated from each other. In one embodiment, the hardness of the filter layer  330  or the gray film  340  may be higher than 1 H, for example, to provide an anti-scratch function. 
       FIG. 4  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel  400  according to a fourth embodiment of the disclosure. The sensing panel  400  of the fourth embodiment is similar to the sensing panel  300  of the third embodiment. In  FIG. 4 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 3  will not be described in the following. In this embodiment, the sensing panel  400  includes a second dielectric layer  454 , wherein the second dielectric layer  454  covers filter layers  430  and separates the filter layers  430  from each other. In one embodiment, a hardness of the second dielectric layer  454  may be, for example, higher than 1 H to provide an anti-scratch function. 
       FIG. 5  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel  500  according to a fifth embodiment of the disclosure. The sensing panel  500  of the fifth embodiment is similar to the sensing panel  100  of the first embodiment. In  FIG. 5 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 1  will not be described in the following. In this embodiment, a gray film  540  of the sensing panel  500  covers filter layers  530  and separates the filter layers  530  from each other, and the filter layers  530  are located between the sensing device layer  120  and the gray film  540 . In one embodiment, a hardness of the gray film  540  may be, for example, higher than 1 H to provide an anti-scratch function. 
       FIG. 6  is a schematic bottom view illustrating a sensing panel of a sensing display panel  600  according to a sixth embodiment of the disclosure. In  FIG. 6 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 1  will not be described in the following. In this embodiment, filter layers  630  of the sensing panel  600  are located on and in contact with corresponding second conductive layers  624 , respectively. A gray film  640  covers each pair of one of the filter layers  630  and one of the corresponding second conductive layers  624 , which may be configured to separate pairs of the filter layers  630  and the corresponding second conductive layers  624  from each other. In one embodiment, a hardness of the gray film  640  may be higher than 1 H, for example, to provide an anti-scratch function. 
       FIG. 7  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel  700  according to a seventh embodiment of the disclosure. In  FIG. 7 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 1  will not be described in the following. In this embodiment, a sensing device layer  720  of the sensing panel  700  is located between a gray film  740  and filter layers  730 , wherein the gray film  740  is adjacent to one side of the first substrate  110  or the buffer layer  30 . The first dielectric layer  752  is provided between first conductive layers  722  and second conductive layers  724 , so that the first conductive layers  722  and the second conductive layers  724  are electrically insulated from each other. Further, a second dielectric layer  754  is formed between the second conductive layers  724  and the filter layers  730 , and between the second conductive layers  724 ; the second dielectric layer  754  may be configured to separate the second conductive layers  724  from the filter layers  730 , and separate the second conductive layers  724  from each other. The third dielectric layer  756  may be configured to cover the filter layers  730 , and separate the filter layers  730  from each other. The first conductive layers  722  and the second conductive layers  724  have different extension directions (D 1  and D 3 ). 
     In an embodiment, the gray film  740  may be located between the first substrate  110  and the buffer layer  30 . In another embodiment, the first substrate  110  may further include nanoparticles of metal or metal oxide, or carbon-based materials such as carbon powder, carbon-containing particles, or carbon black pigment, so that the first substrate  110  may absorb a part of the light and be provided as the gray film  740 . In other embodiments, a hardness of the third dielectric layer  756  may be higher than 1 H, for example, to provide an anti-scratch function. In another embodiment, the first substrate  110  may be removed to reduce the thickness of the sensing panel  700 . The sensing panel  700  is formed on and in contact with the second surface  30   b  of the buffer layer  30 ; the gray film  740  may be located between the sensing device layer  720  and the buffer layer  30 . 
     In other embodiments, the gray film  740  may be located between the sensing device layer  720  and the filter layers  730 . In one embodiment, the gray film  740  may be formed between the first conductive layers  722  and the second conductive layers  724 , and between the first conductive layers  722 , and the gray film  740  may be formed to separate the first conductive layers  722  from the second conductive layers  724 , and separate the first conductive layers  722  from each other. 
       FIG. 8  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel  800  according to an eighth embodiment of the disclosure. The sensing panel  800  of the eighth embodiment is similar to the sensing panel  700  of the seventh embodiment. In  FIG. 8 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 7  will not be described in the following. In this eighth embodiment, filter layers  830  of the sensing panel  800  are disposed on a sensing device layer  820 . A gray film  840  is adjacent to one side of the first substrate  110  or the buffer layer  30 . A first dielectric layer  852  is provided between first conductive layers  822  and second conductive layers  824 , so that the first conductive layers  822  and the second conductive layers  824  are electrically insulated from each other. Further, the second dielectric layer  854  is formed between the second conductive layers  824  and the filter layers  830 , and between the second conductive layers  824 ; the second dielectric layer  854  may be configured to separate the second conductive layers  824  from the filter layers  830 , and separate the second conductive layers  824  from each other. The first conductive layers  822  and the second conductive layer  824  have different extension directions (D 1  and D 3 ). 
     In an embodiment, the gray film  840  may be located between the first substrate  110  and the buffer layer  30 . In another embodiment, the first substrate  110  may further include nanoparticles of metal or metal oxide, or carbon-based materials such as carbon powder, carbon-containing particles, or carbon black pigment, so that the first substrate  110  may absorb a part of the light and be provided as a gray film  840 . In other embodiments, a hardness of the second dielectric layer  854  may be, for example, higher than 1 H to provide an anti-scratch function. In another embodiment, the first substrate  110  may be removed to reduce the thickness of the sensing panel  800 . The sensing panel  800  is formed on and in contact with the second surface  30   b  of the buffer layer  30 ; the gray film  840  may be located between the sensing device layer  820  and the buffer layer  30 . In other embodiments, the gray film  840  may be located between the sensing device layer  820  and the filter layers  830 . 
       FIG. 9  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel  900  according to a ninth embodiment of the disclosure. In  FIG. 9 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 6  will not be described in the following. In this ninth embodiment, the filter layers  930  of the sensing panel  900  are disposed on and in contact with the second conductive layers  924 , wherein the gray film  940  is adjacent to one side of the first substrate  110  or the buffer layer  30 . The first dielectric layer  952  is provided between first conductive layers  922  and the second conductive layers  924 , and between the first conductive layers  922 ; the first dielectric layer  952  may be configured to separate the first conductive layers  922  and the second conductive layers  924 , and separate the first conductive layers  922  from each other. The first conductive layers  922  and the second conductive layers  924  have different extension directions (D 1  and D 3 ). 
     In an embodiment, the gray film  940  may be located between the first substrate  110  and the buffer layer  30 . In another embodiment, the first substrate  110  may further include nanoparticles of metal or metal oxide, or carbon-based materials such as carbon powder, carbon-containing particles, or carbon black pigment, so that the first substrate  110  may absorb a part of the light and be provided as a gray film  940 . In other embodiments, a hardness of the first dielectric layer  952  may be, for example, higher than 1 H to provide an anti-scratch function. In another embodiment, the first substrate  110  may be removed to reduce the thickness of the sensing panel  900 . The sensing panel  900  is foil led on and in contact with the second surface  30   b  of the buffer layer  30 ; the gray film  940  may be located between the sensing device layer  920  and the buffer layer  30 . In one embodiment, the gray film  940  may be formed between the first conductive layers  922  and the second conductive layers  924 , and between the first conductive layers  922 , and the gray film  940  may be configured to separate the first conductive layers  922  and the second conductive layers  924 , and separate the first conductive layers  922  from each other. 
       FIG. 10  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel  1000  according to a tenth embodiment of the disclosure. In  FIG. 10 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 6  will not be described in the following. In this embodiment, filter layers  1030  of the sensing panel  1000  are disposed on and in contact with corresponding second conductive layers  1024 , wherein a gray film  1040  is adjacent to one side of the first substrate  110  or the buffer layer  30 . A second dielectric layer  1054  is provided to cover each pair of one of the filter layers  1030  and one of the corresponding second conductive layers  1024 . The second dielectric layer  1054  may be configured to separate pairs of the filter layers  1030  and the corresponding second conductive layers  1024  from each other. A first dielectric layer  1052  is between the first conductive layers  1022  and the second conductive layers  1024 , and between first conductive layers  1022 . The first dielectric layer  1052  may be configured to separate the first conductive layers  1022  from the second conductive layers  1024 , and separate the first conductive layers  1022  from each other. The first conductive layers  1022  and the second conductive layers  1024  have different extension directions (D 1  and D 3 ). 
     In an embodiment, the gray film  1040  may be located between the first substrate  110  and the buffer layer  30 . In another embodiment, the first substrate  110  may further include nanoparticles of metal or metal oxide, or carbon-based materials such as carbon powder, carbon-containing particles, or carbon black pigment, so that the first substrate  110  may absorb a part of the light and be provided as the gray film  1040 . In other embodiments, a hardness of the second dielectric layer  1054  may be, for example, higher than 1 H to provide an anti-scratch function. In another embodiment, the first substrate  110  may be removed to reduce the thickness of the sensing panel  1000 . The sensing panel  1000  is formed on and in contact with the second surface  30   b  of the buffer layer  30 ; the gray film  1040  may be located between the sensing device layer  1020  and the buffer layer  30 . In other embodiment, the gray film  1040  may be formed between the first conductive layers  1022  and the second conductive layers  1024 , and between the first conductive layers  1022 . The gray film  1040  may be configured to separate the first conductive layers  1022  and the second conductive layers  1024 , and separate the first conductive layers  1022  from each other. In one embodiment, the gray film  1040  may be located on the second dielectric layer  1054 , wherein a hardness of the gray film  1040  may be, for example, higher than 1 H to provide an anti-scratch function. 
       FIG. 11  is a schematic cross-sectional view illustrating a sensing panel of a sensing display panel  1100  according to an eleventh embodiment of the disclosure. In  FIG. 11 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 7  will not be described in the following. In this eleventh embodiment, a buffer layer  301  of the sensing panel  1100  may further include nanoparticles of metal or metal oxide, or carbon-based materials such as carbon powder, carbon-containing particles, or carbon black pigment, so that the buffer layer  301  may absorb a part of the light and be provided as a gray film  1140 . In an embodiment, an optical density ratio between the buffer layer  301  and the at least one filter layer  1130  with respect to visible light is N, and N may be greater than 1 and less than or equal to 40. The sensing device layer  1120  is located between the first substrate  110  and filter layers  1130 . A first dielectric layer  1152  is provided between first conductive layers  1122  and second conductive layers  1124 , so that the first conductive layers  1122  and the second conductive layers  1124  are electrically insulated from each other. Further, a second dielectric layer  1154  is formed between the second conductive layers  1124  and the filter layers  1130 , and between the second conductive layers  1124 ; the second dielectric layer  1154  may be configured to separate the second conductive layers  1124  from the filter layers  1130 , and separate the second conductive layers  1124  from each other. A third dielectric layer  1156  is formed on the filter layers  1130  and between the filter layers  1130 , and the third dielectric layer  1156  may be configured to separate the filter layers  1130  from each other. The first conductive layers  1122  and the second conductive layers  1124  have different extension directions (D 1  and D 3 ). In one embodiment, a hardness of the third dielectric layer  1156  may be, for example, higher than 1 H to provide an anti-scratch function. In another embodiment, the first substrate  110  may be removed to reduce the thickness of the sensing panel  1100 . The sensing panel  1100  is formed on and in contact with a second surface  301   b  of the buffer layer  301 . 
       FIG. 12  is a schematic cross-sectional view illustrating a sensing panel  1200  according to a twelfth embodiment of the disclosure. In  FIG. 12 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 8  will not be described in the following. In this twelfth embodiment, a buffer layer  302  of the sensing panel  1200  may further include nanoparticles of metal or metal oxide, or carbon-based materials such as carbon powder, carbon-containing particles, or carbon black pigment, so that the buffer layer  302  may absorb a part of the light and be provided as a gray film  1240 . In an embodiment, an optical density ratio between the buffer layer  302  and the at least one filter layer  1230  with respect to visible light is N, and N may be greater than 1 and less than or equal to 40. The sensing device layer  1220  is located between the first substrate  110  and the filter layer  1230 . The first dielectric layer  1252  is provided between first conductive layers  1222  and second conductive layers  1224 , so that the first conductive layers  1222  and the second conductive layers  1224  are electrically insulated from each other. Further, a second dielectric layer  1254  is formed between the second conductive layers  1224  and the filter layers  1230 , and between the second conductive layers  1224 ; the second dielectric layer  1254  may be configured to separate the second conductive layer  1224  from the filter layers  1230 , and separate the second conductive layers  1224  from each other. The first conductive layers  1222  and the second conductive layers  1224  have different extension directions (D 1  and D 3 ). In one embodiment, a hardness of the second dielectric layer  1254  may be, for example, higher than 1 H to provide an anti-scratch function. In another embodiment, the first substrate  110  may be removed to reduce the thickness of the sensing panel  1200 . The sensing panel  1200  is formed on and in contact with a second surface  302   b  of the buffer layer  302 . 
       FIG. 13  is a schematic cross-sectional view illustrating a sensing panel  1300  according to a thirteenth embodiment of the disclosure. In  FIG. 13 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 9  will not be described in the following. In this thirteenth embodiment, a buffer layer  303  of the sensing panel  1300  may further include nanoparticles of metal or metal oxide, or carbon-based materials such as carbon powder, carbon-containing particles, or carbon black pigment, so that the buffer layer  303  may absorb a part of the light and be provided as a gray film  1340 . In an embodiment, an optical density ratio between the buffer layer  303  and the at least one filter layer  1330  with respect to visible light is N, and N may be greater than 1 and less than or equal to 40. Filter layers  1330  are located on and in contact with second conductive layers  1324 . A first dielectric layer  1352  is provided between first conductive layers  1322  and second conductive layers  1324 , and between the first conductive layers  1322 ; the first dielectric layer  1352  may be configured to separate the first conductive layers  1322  from the second conductive layers  1324 , and separate the first conductive layers  1322  from each other. The first conductive layers  1322  and the second conductive layers  1324  have different extension directions (D 1  and D 3 ). In one embodiment, a hardness of the first dielectric layer  1352  may be, for example, higher than 1 H to provide an anti-scratch function. In another embodiment, the first substrate  110  may be removed to reduce the thickness of the sensing panel  1300 . The sensing panel  1300  is formed on and in contact with a second surface  303   b  of the buffer layer  303 . 
       FIG. 14  is a schematic cross-sectional view illustrating a sensing panel  1400  according to a fourteenth embodiment of the disclosure. In  FIG. 14 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 10  will not be described in the following. In this fourteenth embodiment, a buffer layer  304  of the sensing panel  1400  may further include nanoparticles of metal or metal oxide, or carbon-based materials such as carbon powder, carbon-containing particles, or carbon black pigment, so that the buffer layer  304  may absorb a part of the light and be provided as a gray film  1440 . Filter layers  1430  are located on and in contact with corresponding second conductive layers  1424 . A second dielectric layer  1454  is provided between the filter layers  1430  and the corresponding second conductive layers  1424 , and the second dielectric layer  1454  may be configured to cover each pair of one of the filter layers  1430  and one of the corresponding second conductive layers  1424 . A first dielectric layer  1452  is provided between first conductive layers  1422  and the second conductive layers  1424 , and between the first conductive layers  1422 ; the first dielectric layer  1452  may be configured to separate the first conductive layers  1422  from the second conductive layers  1424 , and separate the first conductive layers  1422  from each other. The first conductive layers  1422  and the second conductive layers  1424  have different extension directions (D 1  and D 3 ). In one embodiment, a hardness of the second dielectric layer  1454  may be, for example, higher than 1 H to provide an anti-scratch function. In another embodiment, the first substrate  110  may be removed to reduce the thickness of the sensing panel  1400 . The sensing panel  1400  is formed on and in contact with a second surface  304   b  of the buffer layer  304 . 
       FIG. 15A ˜ FIG. 15C  are schematic cross-sectional views illustrating various arrangements of a color filter layer cooperated with the sensing display panel  10  shown in  FIG. 1 , respectively, according to a fifteenth embodiment of the disclosure. Wherein,  FIG. 15A  is a schematic cross-sectional view illustrating an exemplary arrangement of the color filter layer cooperated with the sensing display panel  10 .  FIG. 15B  is a schematic cross-sectional view illustrating another exemplary arrangement of the color filter layer cooperated with the sensing display panel  10 .  FIG. 15C  is a schematic cross-sectional view illustrating yet another exemplary arrangement of the color filter layer cooperated with the sensing display panel  10 . Take an arrangement shown in  FIG. 15A  as an example. Color filter layers may be disposed between filter layers  1530 , respectively, wherein a color filter layer  1560  may include a first color filter layer  1560   a,  a second color filter layer  1560   b,  and a third color filter layer  1560   c,  to allow light with different colors (for example, red light, blue light, or green light) to pass through. Take a common arrangement as an example. Each color filter layer  1560  on the sensing panel  100  may shield light that is not emitted by the corresponding light emitting region  26  on the display panel  20  and reduce the reflection of ambient light, so as to reduce the light leakage of the sensing display panel  10 . In addition, the light emitted by the light emitting region  26  after passing through the color filter layer  1560  may increase the color saturation to reinforce the display quality of the sensing display panel  10 . Based on needs, the color filter layer  1560  may be disposed in other embodiments of the disclosure. 
     In an embodiment, the color filter layer  1560  may be formed by a way of inkjet printing. The forming process includes, for example, forming the filter layers  1530  with a plurality of openings on a substrate, injecting color inks (for example, red, green, or blue inks) into the openings of the filter layers  1530  by inkjet printing, and then performing a thermal baking process or a photo-curing process to cure the color inks, thereby forming the color filter layer  1560 . The color inks are, for example, pigments, dyes or a combination thereof. 
     As shown in  FIG. 15A , the color filter layer  1560  may be aligned with the edges of the filter layers  1530 . In another embodiment, the color filter layer  1560  may be not aligned with the edges of the filter layers  1530 . Referring to  FIGS. 15B and 15C , only some of the layers are illustrated in  FIGS. 15B and 15C  for clarity of illustration. As shown in  FIG. 15B , there is a color filter layer  1560 ′ disposed between filter layers  1530 ′, and there is a gap G provided between the color filter layer  1560 ′ and the filter layer  1530 ′. As shown in  FIG. 15C , there is a color filter layer  1560 ″ provided between filter layers  1530 ″, and the color filter layer  1560 ″ and the adjacent filter layers  1530 ″ may be partially overlapped. 
       FIG. 16  is a schematic cross-sectional view illustrating a sensing panel  1600  according to a sixteenth embodiment of the disclosure, only some of the layers are illustrated in  FIG. 16  for clarity of illustration. In  FIG. 16 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 1  will not be described in the following. In this sixteenth embodiment, a sensing device layer  1620  includes at least one first filter conductive layer  1622  and at least one second filter conductive layer  1624 , and the first and the second filter conductive layers are insulated from each other. The at least one first filter conductive layer  1622  and the at least one second filter conductive layer  1624  of the sensing panel  1600  may correspond to positions between the sub-pixels of the display panel  20  to avoid light leakage. In addition, the at least one first filter conductive layer  1622  and the at least one second filter conductive layer  1624  of the sensing panel  1600  may locally shield the light reflected by the reflective layer  281  of the display panel  20 , so as to enhance the display quality of the sensing display panel  10 . In the embodiment, the at least one first filter conductive layer  1622  and the at least one second filter conductive layer  1624  are conductive, thus in addition to receiving light, these filter conductive layers  1622  and  1624  may further transmit an electronic signal for being adapted to sense an electrical change generated by the user&#39;s touch. Furthermore, an ambient light L entering the sensing panel  1600  from the sensing surface  100 S becomes a transmitted light and does not generate reflection from irradiation to the sensing device layers  1620 . Thus, the images displayed by the display panel  20  and observed from outside through the sensing surface  100 S of the sensing panel  1600  are not affected. Consequently, the display quality of the sensing display panel  10  may be reinforced. 
     In the embodiment, a gray film  1640  is located between the at least one first filter conductive layer  1622  and the at least one second filter conductive layer  1624 . The at least one first filter conductive layer  1622  and the at least one second filter conductive layer  1624  are electrically insulated from each other by the gray film  1640 . In an embodiment, a hardness of the gray film  1640  may be, for example, higher than 1 H to provide an anti-scratch function. 
       FIG. 17  is a schematic cross-sectional view illustrating a sensing panel  1700  according to a seventeenth embodiment of the disclosure. In  FIG. 17 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 1  will not be described in the following. In this seventeenth embodiment, the sensing device layer  1720  further includes at least one sensing bridge  1726  and a plurality of conductive vias  1728 . The conductive vias  1728  penetrate through a first dielectric layer  1752 , and the first dielectric layer  1752  is located between the sensing bridge  1726 , the at least one first conductive layer  1722  and the at least one second conductive layer  1724 . In an embodiment, vias are formed in the first dielectric layer  1752  by etching, grind-drilling, laser drilling, or other suitable processes. Then, a conductive material is filled into the vias to form the conductive vias  1728  in the first dielectric layer  1752 . Each of the at least one first conductive layer  1722  may connect to one of the sensing bridge  1726  on the first dielectric layer  1752  through one corresponding conductive via  1728 . In one embodiment, the sensing panel  1700  may have a buffer layer (not shown) on the other side of the first substrate  110  with respect to the sensing device layer  1720 . The buffer layer may further include nanoparticles of metal or metal oxide, or carbon-based materials such as carbon powder, carbon-containing particles, or carbon black pigment, so that the buffer layer may absorb a part of the light and be provided as the gray film  1740 . In an embodiment, an optical density ratio between the filter layer  1730  and the gray film  1740  with respect to visible light is N, and N may be greater than 1 and less than or equal to 40. 
       FIG. 18  is a schematic cross-sectional view illustrating a sensing panel  1800  according to an eighteenth embodiment of the disclosure, only some of the layers are illustrated in  FIG. 18  for clarity of illustration. In  FIG. 18 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 17  will not be described in the following. In this eighteenth embodiment, the sensing device layers  1820  includes at least one first filter conductive layer  1822  and at least one the second filter conductive layer  1824 , and these first and second filter conductive layers are insulated from each other. A gray film  1840  is formed between the at least one first filter conductive layer  1822 , the at least one second filter conductive layer  1824  and at least one sensing bridge  1826 , and between the at least one first filter conductive layer  1822  and the at least one second filter conductive layer  1824 . The gray film  1840  may be configured to separate the at least one first filter conductive layer  1822  from the at least one second filter conductive layer  1824 , and separate the at least one first filter conductive layer  1822 , the at least one second filter conductive layer  1824  and the at least one sensing bridge  1826  from one another. The at least one first filter conductive layer  1822  and the at least one second filter conductive layer  1824  of the sensing panel  1800  may correspond to positions between the sub-pixels of the display panel  20  to avoid light leakage, and also may locally shield the light reflected by the reflective layer  281  of the display panel  20 . In the embodiment, the at least one first filter conductive layer  1822  and the at least one second filter conductive layer  1824  are conductive, thus in addition to receiving light, the at least one first filter conductive layer  1822  and the at least one second filter conductive layer  1824  may further transmit an electronic signal, for being adapted to sense an electrical change generated by the user&#39;s touch. Furthermore, an ambient light L entering the sensing panel  1800  from the sensing surface  100 S becomes a transmitted light and does not generate reflection from irradiation to the sensing device layers  1820 . Thus, images displayed by the display panel  20  and observed from outside through the sensing surface  100 S of the sensing panel  1800  are not affected. Consequently, the display quality of the sensing display panel  10  may be reinforced. In an embodiment, the sensing bridge  1826  and conductive vias  1828  may be made of a conductive material having a filter property. 
       FIG. 19  is a schematic cross-sectional view illustrating a sensing panel  1900  according to a nineteenth embodiment of the disclosure. In  FIG. 19 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 17  will not be described in the following. In this nineteenth embodiment, a sensing device layer  1920  further includes at least one sensing bridge  1926  and a plurality of conductive vias  1928 , wherein at least one filter layer  1930  is located between the sensing device layer  1920  and a gray film  1940 . The at least one sensing bridge  1926  is adjacent to one side of the first substrate  110 , the conductive vias  1928  penetrate through a first dielectric layer  1952 , and the first dielectric layer  1952  is located between the at least one sensing bridge  1926  and the at least one first conductive layer  1922  and the at least one second conductive layer  1924 . In this embodiment, vias are formed in the first dielectric layer  1952  by etching, grind-drilling, laser drilling, or other suitable processes. Then, a conductive material is filled into the vias to form the conductive vias  1928  in the first dielectric layer  1952 . Each of the at least one first conductive layer  1922  may connect to one of the sensing bridge  1926  on the first dielectric layer  1952  through a corresponding conductive via  1928 . In one embodiment, the sensing panel  1900  may have a buffer layer (not shown) on the other side of the first substrate  110  with respect to the sensing device layer  1920 , and the buffer layer may further include nanoparticles of metal or metal oxide, or carbon-based materials such as carbon powder, carbon-containing particles, or carbon black pigment, so that the buffer layer may absorb a part of the light and be provided as the gray film  1940 . In an embodiment, an optical density ratio between the filter layer  1930  and the gray film  1940  with respect to visible light is N, and N may be greater than 1 and less than or equal to 40. 
       FIG. 20  is a schematic cross-sectional view illustrating a sensing panel  2000  according to a twentieth embodiment of the disclosure, only some of the layers are illustrated in  FIG. 20  for clarity of illustration. In  FIG. 20 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 19  will not be described in the following. In this twentieth embodiment, a sensing device layers  2020  includes at least one first filter conductive layer  2022  and at least one the second filter conductive layer  2024 , and these first and second filter conductive layers are insulated from each other. A gray film  2040  is formed between the first filter conductive layer  2022 , the second filter conductive layer  2024  and the sensing bridge  2026 , and between the at least one first filter conductive layer  2022  and the at least one second filter conductive layer  2024 . The gray film  2040  may be configured to separate the at least one first filter conductive layer  2022  from the at least one second filter conductive layer  2024 , and separate the at least one first filter conductive layer  2022 , the at least one second filter conductive layer  2024  and the at least one sensing bridge  2026  from one another. The at least one first filter conductive layer  2022  and the at least one second filter conductive layer  2024  of the sensing panel  2000  may correspond to positions between the sub-pixels of the display panel  20  to avoid light leakage, and also may locally shield the light reflected by the reflective layer  281  of the display panel  20 . In this embodiment, the at least one first filter conductive layer  2022  and the at least one second filter conductive layer  2024  are conductive, thus in addition to receiving light, these first and second filter conductive layers may further transmit an electronic signal, for being adapted to sense an electrical change generated by the user&#39;s touch. Furthermore, an ambient light L entering the sensing panel  2000  from the sensing surface  100 S becomes a transmitted light and does not generate reflection from irradiation to the sensing device layers  2020 . Thus, images displayed by the display panel  20  and observed from outside through the sensing surface  100 S of the sensing panel  2000  are not affected. Consequently, the display quality of the sensing display panel  10  may be reinforced. In an embodiment, the at least one sensing bridge  2026  and the conductive vias  2028  may be made of a conductive material having a filter property. 
       FIG. 21  is a schematic cross-sectional view illustrating a sensing panel  2100  according to a twenty-first embodiment of the disclosure. In  FIG. 21 , like or similar reference numerals represent like or similar components. Thus, components already described in  FIG. 1  will not be described in the following. In this twenty-first embodiment, a sensing device layer  2120  includes at least one first conductive layer  2122  and at least one the second conductive layer  2124 , and these first and second filter conductive layers are insulated from each other. The sensing device layer  2120  may be used to detect a signal generated by the user when the sensing display panel  10  is touched. A first dielectric layer  2152  is formed between each of the first conductive layers  2122  and the second conductive layer  2124 ; the first dielectric layer  2152  may be configured to separate each of the first conductive layer  2122  and the second conductive layer  2124  from each other. At least one filter layer  2130  is located between the gray film  2140  and the sensing device layer  2120 . In one embodiment, a hardness of a gray film  2140  may be, for example, higher than 1 H to provide an anti-scratch function. 
     According to the aforesaid, in an embodiment, a sensing display panel of the present disclosure may include a display panel, a buffer layer, and a sensing panel. The display panel may include a first substrate and a reflective layer disposed on the first substrate. The buffer layer may have a first surface and a second surface opposite to the first surface, and the display panel may be disposed on the first surface. The sensing display may have a sensing surface disposed on the second surface of the buffer layer. The sensing display may include at least one filter layer, a gray film and a sensing device layer. Light transmitted from the sensing surface toward the sensing panel, the buffer layer, and the display panel may be reflected by the reflective layer. An optical density ratio between the gray film and the at least one filter layer with respect to visible light is N, and N may be greater than 1 and less than or equal to 40. 
     The sensing display panel according to disclosed embodiments may absorb light leakage from a sensing display panel and/or reflected ambient light by the filter layer and/or the gray film, to reduce the reflected light of the ambient light and/or the leaked light emitted from a sensing surface to improve the display quality. In the disclosed embodiments of the sensing display panel, the sensing panel and the display panel are bonded in the same direction to facilitate engagement. In addition, after the substrate of the sensing panel is removed, the sensing panel and the display panel may share the bonding area. 
     It will be clear that various modifications and variations can be made to the disclosure. It is intended that the specification and examples be considered as exemplary embodiments only, with a scope of the disclosure being indicated by the following claims and their equivalents.