Patent Publication Number: US-2022223826-A1

Title: Display panel and manufacturing method thereof

Description:
This application is a division of U.S. patent application Ser. No. 16/341,446 filed Apr. 12, 2019, which is hereby incorporated by reference herein in its entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a field of display technology, and particularly to a display panel and a manufacturing method for the display panel. 
     BACKGROUND 
     A display apparatus has advantages, such as a thin body, saving-power, no radiation, and is widely used. A conventional display apparatus mostly is a backlight display apparatus including a display panel and a backlight module. Operating principle of the display apparatus is that liquid crystal (LC) molecules are disposed between two substrates, where the two substrates are parallelly disposed, and a driver voltage applies on the two substrates to control a rotation direction of the LC molecules, so that light of a backlight module are refracted to generate images. 
     A thin film transistor-liquid crystal display (TFT-LCD) has some performances, such as low power consumption, excellent image quality, and high production yield, which has gradually occupied main position of a display field. The TFT-LCD includes a display panel and the backlight module, where the display panel includes a color filter (CF) substrate and a TFT substrate. A transparent electrode is disposed on inner side of the two substrates and the LC layer is disposed between the two substrates. The display panel controls the rotation direction of the LC molecules through electrical field, a polarization state of the light is changed, and penetration and blocking of light path are achieved through a polarizing plate to display. 
     As a liquid crystal display (LCD) product tends to develop into high-resolution, an LCD technology also has some urgent problems to solve. For example, a conventional display panel is not enough intelligent: when the conventional display panel is under the sun, the backlight of the conventional display panel is too dark to see the image, however, when the conventional display panel is in the dark, the conventional display panel is too bright and glare. 
     It should be noticed that a description of related prior art is to clearly and completely described for the technical scheme of the present disclosure, which is convenient to understand for a person skilled in the art. The above technology scheme is not considered to be known to the person skilled in the art because the above technology scheme is described in the background of the present disclosure. 
     SUMMARY 
     A main technical problem solved by the present disclosure is to provide a display panel and a manufacturing method capable of autonomic adjustment according to external environment. 
     The present disclosure provides a display panel, comprising: 
     a substrate; 
     a switch assembly disposed on the substrate; the switch assembly comprises an indium gallium zinc oxide (IGZO) layer; and 
     a light-sensing assembly disposed on a side of the switch assembly. 
     The present disclosure provides a display panel, comprising: 
     a substrate; 
     a switch assembly disposed on the substrate; the switch assembly comprises an indium gallium zinc oxide (IGZO) layer; and 
     a light-sensing assembly disposed on a side of the switch assembly. 
     Furthermore, the switch assembly further comprises an etching barrier layer. The etching barrier layer is disposed on the IGZO layer. 
     A light-sensing metal layer is disposed on an extended portion of the etching barrier layer and the light-sensing assembly is disposed on the light-sensing metal layer. 
     A transparent conducting layer is disposed on the light-sensing metal layer. 
     The light-sensing assembly comprises a P-type semiconductor layer, an intrinsic semiconductor layer, and an N-type semiconductor layer in order on the light-sensing metal layer. 
     Furthermore, the switch assembly comprises a gate electrode metal layer, a gate insulation layer, the IGZO layer, an etching barrier layer, a source electrode layer, and a drain electrode layer on the substrate in sequence. The source electrode layer and the drain electrode layer are in a same layer. 
     A light-sensing metal layer is disposed on an extended portion of the etching barrier layer and the light-sensing assembly is disposed on the light-sensing metal layer. 
     The light-sensing metal layer, the source electrode layer, and the drain electrode layer are in the same layer. 
     Furthermore, the switch assembly comprises a gate electrode metal layer, a gate insulation layer, the IGZO layer, an etching barrier layer, a source electrode layer, and a drain electrode layer on the substrate in sequence. The source electrode layer and the drain electrode layer are in a same layer. 
     Furthermore, the switch assembly further comprises an etching barrier layer. The etching barrier layer is disposed on the IGZO layer, and the light-sensing assembly is disposed on an extended portion of the etching barrier layer. 
     Furthermore, a light-sensing metal layer is disposed on an extended portion of the etching barrier layer and the light-sensing assembly is disposed on the light-sensing metal layer. 
     A transparent conducting layer is disposed on the light-sensing metal layer. 
     Furthermore, the light-sensing assembly comprises a P-type semiconductor layer, an intrinsic semiconductor layer, and an N-type semiconductor layer in order on the light-sensing metal layer. 
     Furthermore, a passivation layer covers the switch assembly and the light-sensing assembly. 
     Furthermore, a transparent conducting layer is disposed on the passivation layer corresponding to the switch assembly, and a transparent conducting layer is disposed on the passivation layer corresponding to the light-sensing assembly. 
     Furthermore, a light-sensing metal layer is disposed on an extended portion of the etching barrier layer and the light-sensing assembly is disposed on the light-sensing metal layer. 
     The light-sensing metal layer, the source electrode layer, and the drain electrode layer are in the same layer. 
     Furthermore, a passivation layer covers the switch assembly and the light-sensing assembly. 
     A transparent conducting layer is disposed on the passivation layer corresponding to the switch assembly, and a transparent conducting layer is disposed on the passivation layer corresponding to the light-sensing assembly. 
     The present disclosure provides 
     a substrate; 
     a switch assembly disposed on the substrate; the switch assembly comprises an indium gallium zinc oxide (IGZO) layer; and 
     a light-sensing assembly disposed on a side of the switch assembly. 
     The switch assembly comprises a gate electrode metal layer, a gate insulation layer, the IGZO layer, an etching barrier layer, a source electrode layer, and a drain electrode layer on the substrate in sequence, where the source electrode layer and the drain electrode layer are in a same layer. 
     The switch assembly further comprises an etching barrier layer; the etching barrier layer is disposed on the IGZO layer; light-sensing assembly is disposed on an extended portion of the etching barrier layer. 
     A light-sensing metal layer is disposed on the extended portion of the etching barrier layer and the light-sensing assembly is disposed on the light-sensing metal layer. 
     A transparent conducting layer is disposed on the light-sensing metal layer. 
     The light-sensing assembly comprises P-type semiconductor layer, an intrinsic semiconductor layer, and N-type semiconductor layer in order on the light-sensing metal layer. 
     A light-sensing metal layer is disposed on an extended portion of the etching barrier layer and the light-sensing assembly is disposed on the light-sensing metal layer. 
     The light-sensing metal layer, the source electrode layer, and the drain electrode layer are in the same layer. 
     The present disclosure further comprises a manufacturing method for a display panel, where the manufacturing method, comprising: 
     providing a substrate; 
     forming a switch assembly on the substrate; the switch assembly comprises an indium gallium zinc oxide (IGZO) layer; and 
     forming a light-sensing assembly on a side of the switch assembly. 
     Furthermore, the step for forming the switch assembly comprising: 
     providing a glass substrate as the substrate; 
     forming a gate electrode metal layer, a gate insulation layer, the IGZO layer, an etching barrier layer, a source electrode layer, and a drain electrode layer on the substrate in sequence to form the switch assembly; the source electrode layer and the drain electrode layer are in a same layer. 
     Furthermore, the step for forming the switch assembly comprising the IGZO layer on the substrate, comprising: 
     forming an etching barrier layer on the IGZO layer; 
     the step for forming a light-sensing assembly on a side of the switch assembly, comprising: forming the light-sensing assembly on an extended portion of the etching barrier layer. 
     Furthermore, the step for forming the light-sensing assembly on the extended portion of the etching barrier layer, comprising: 
     forming a light-sensing metal layer on the extended portion of the etching barrier layer; 
     forming the light-sensing assembly on the light-sensing metal layer; and 
     forming a transparent conducting layer on the light-sensing assembly. 
     Furthermore, the step for forming the light-sensing assembly, comprising: 
     forming a P-type semiconductor layer on the light-sensing metal layer; 
     forming an intrinsic semiconductor layer on the P-type semiconductor layer; 
     and forming an N-type semiconductor layer on the intrinsic semiconductor layer. 
     Furthermore, a passivation layer covers the switch assembly and the light-sensing assembly. 
     Furthermore, a transparent conducting layer is disposed on the passivation layer corresponding to the switch assembly, and a transparent conducting layer is disposed on the passivation layer corresponding to the light-sensing assembly. 
     Furthermore, a light-sensing metal layer is disposed on the extended portion of the etching barrier layer and the light-sensing assembly is disposed on the light-sensing metal layer. 
     The light-sensing metal layer, the source electrode layer, and the drain electrode layer are in the same layer. 
     The light-sensing assembly is proportionally disposed on the side of the switch assembly of the display panel in the display panel of the present disclosure, such as one-to-one or multiple-to-one. Thus, an external environment of a display area of the display panel, particularly to external light intensity, can be perceived by the light sensing assembly. Therefore, when the light intensity is strong, the display panel can automatically be adjusted to increase brightness and enhance contrast ratio, which avoids that the display image too dark to see. When the light intensity is weak, the display panel can automatically be adjusted to decrease brightness and reduce contrast ratio, which avoids that the display image too light to hurt eyes, which improves sensory experience. In addition, the switch assembly is made of IGZO, power consumption of the display screen is approximate to the power consumption of the OLED using the IGZO technology, cost is lower, thickness of the display screen is only 25% greater than thickness of the OLED, and resolution of the display screen can reach level degree as full high-definition or even ultra-definition (resolution 4k*2k). The IGZO is an amorphous oxide containing indium, gallium, and zinc. Carrier mobility of the amorphous oxide is 20-30 times of carrier mobility of amorphous silicon, which greatly improves charge and discharge rate of the TFT to the pixel electrode, improves response speed of the pixel, achieves faster refresh rate, and improves line scanning speed rate of the pixel because of faster response speed, further making the TFT-LCD have ultrahigh resolution. In addition, as a number of transistors reduce and light transmittance of each pixel is improved, an IGZO display apparatus has higher energy efficiency level and higher efficiency. Furthermore, the IGZO can be produced using existing amorphous silicon production line, which is only slightly changed, therefore, compared with cost of the low-temperature polycrystalline silicon, the IGZO is more competitive in cost. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic diagram of a display panel in an embodiment of the present disclosure. 
         FIG. 2  is a schematic diagram of a manufacturing process of the present disclosure. 
         FIG. 3  is a flowchart of a manufacturing method of the display panel in an embodiment of the present disclosure. 
         FIG. 4  is a schematic diagram of the manufacturing method of the display panel in an embodiment of the present disclosure. 
         FIG. 5  is a schematic structural diagram of a display apparatus in an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Specific structure and function details disclosed herein are only representative and are used for the purpose of describing exemplary embodiments of the present application. However, the present application may be specifically achieved in many alternative forms and shall not be interpreted to be only limited to the embodiments described herein. 
     It should be understood in the description of the present application that terms such as “central”, “horizontal”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, etc. indicate direction or position relationships shown based on the drawings, and are only intended to facilitate the description of the present application and the simplification of the description rather than to indicate or imply that the indicated device or element must have a specific direction or constructed and operated in a specific direction, and therefore, shall not be understood as a limitation to the present application. In addition, the terms such as “first” and “second” are only used for the purpose of description, rather than being understood to indicate or imply relative importance or hint the number of indicated technical features. Thus, the feature limited by “first” and “second” can explicitly or impliedly comprises one or more features. In the description of the present application, the meaning of “a plurality of” is two or more unless otherwise specified. In addition, the term “comprise” and any variant are intended to cover non-exclusive inclusion. 
     It should be noted in the description of the present application that, unless otherwise specifically regulated and defined, terms such as “installation,” “bonded,” and “bonding” shall be understood in broad sense, and for example, may refer to fixed bonding or detachable bonding or integral bonding; may refer to mechanical bonding or electrical bonding; and may refer to direct bonding or indirect bonding through an intermediate medium or inner communication of two elements. For those of ordinary skill in the art, the meanings of the above terms in the present application may be understood according to concrete conditions. 
     The terms used herein are intended to merely describe concrete embodiments, not to limit the exemplary embodiments. Unless otherwise noted clearly in the context, singular forms “one” and “single” used herein are also intended to comprise plurals. It should also be understood that the terms “comprise” and/or “include” used herein specify the existence of stated features, integers, steps, operation, units and/or assemblies, not excluding the existence or addition of one or more other features, integers, steps, operation, units, assemblies and/or combinations of these. 
       FIG. 1  is a schematic diagram of a display panel in an embodiment of the present disclosure.  FIG. 2  is a schematic diagram of a manufacturing process of the display panel in an embodiment of the present disclosure. As shown in  FIG. 1  and  FIG. 2 , the present disclosure provides the display panel, where the display panel comprises a substrate  100 , a switch assembly  10  disposed on the substrate  100 , and a light-sensing assembly  20  disposed on a side of the switch assembly  10 . The switch assembly  10  comprises an indium gallium zinc oxide (IGZO) layer  14 . 
     The display panel may be a liquid crystal display (LCD) or an organic light-emitting diode (OLED). When the display panel is the LCD, the display panel comprises a color resistance layer, where the color resistance layer is disposed opposite an array substrate or directly forms on the array substrate. When the display panel is a white-light OLED (using the OLED emitting white light as a pixel point light source, and colors are filtered out through red-green-blue color film). The display panel also is the OLED display panel made of a self-luminous organic material, where the OLED display panel is widely developed. 
     The light-sensing assembly is proportionally disposed on the side of the switch assembly of the display panel in the display panel of the present disclosure, such as one-to-one or multiple-to-one. Thus, an external environment of a display area of the display panel, particularly to external light intensity, can be perceived by the light sensing assembly. Therefore, when the light intensity is strong, the display panel can automatically be adjusted to increase brightness and enhance contrast ratio, which avoids that the display image too dark to see. When the light intensity is weak, the display panel can automatically be adjusted to decrease brightness and reduce contrast ratio, which avoids that the display image too light to hurt eyes, which improves sensory experience. In addition, the switch assembly is made of IGZO, power consumption of the display screen is approximate to the power consumption of the OLED using the IGZO technology, cost is lower, thickness of the display screen is only 25% greater than thickness of the OLED, and resolution of the display screen can reach level degree as full high-definition or even ultra-definition (resolution 4k*2k). The IGZO is an amorphous oxide containing indium, gallium, and zinc. Carrier mobility of the amorphous oxide is 20-30 times of carrier mobility of amorphous silicon, which greatly improves charge and discharge rate of the TFT to the pixel electrode, improves response speed of the pixel, achieves faster refresh rate, and improves line scanning speed rate of the pixel because of faster response speed, further making the TFT-LCD have ultrahigh resolution. 
     In addition, as a number of transistors reduce and light transmittance of each pixel is improved, an IGZO display apparatus has higher energy efficiency level and higher efficiency. Furthermore, the IGZO can be produced using existing amorphous silicon production line, which is only slightly changed, therefore, compared with cost of the low-temperature polycrystalline silicon, the IGZO is more competitive in cost. 
     In the embodiment, the substrate  100  comprises a glass substrate  30 , where the switch assembly  10  comprises the gate electrode metal layer  12 , the gate insulation layer  13 , the IGZO layer  14 , an etching barrier layer  11 , the source electrode layer  15 , and the drain electrode layer  16  on the glass substrate  30  in sequence. The source electrode layer  15  and the drain electrode layer  16  are in a same layer. In the embodiment scheme, the intrinsic semiconductor layer of the switch assembly is made of the IGZO, power consumption of the display screen is approximate to the power consumption of the OLED using the IGZO technology, cost is lower, thickness of the display screen is only 25% greater than thickness of the OLED, and resolution of the display screen can reach level degree as full high-definition or even ultra-definition (resolution 4k*2k). 
     In the embodiment, a passivation layer  17  covers the switch assembly  10  and the light-sensing assembly  20 . 
     In the embodiment, the switch assembly  10  further comprises an etching barrier layer  11 , where the etching barrier layer is disposed on the IGZO layer  14 . The light-sensing assembly  20  is disposed on an extended portion of the etching barrier layer  11 . In the embodiment, the etching barrier layer forms and extends along the side of the switch assembly, and the light-sensing assembly forms on the extended portion of the etching barrier layer, which saves process. The etching barrier layer uses etch-stop layer (ESL) structure having island-shape. The TFT structure of the etching barrier layer/an etching protection layer has advantages having small parasitic capacitor, which is widely used, and improves the IGZO layer. 
     In the embodiment, a light-sensing metal layer  21  is disposed on the extended portion of the etching barrier layer  11  and the light-sensing assembly  20  is disposed on the light-sensing metal layer  21 . 
     A transparent conducting layer  22  is disposed on the light-sensing assembly  20 . In the embodiment, the light-sensing metal layer, the source electrode layer, and the drain electrode layer are in the same layer and forms together, which saves process. The light-sensing metal layer is regarded as a bottom electrode of the light-sensing assembly, and the transparent conducting layer is regarded as a top electrode of the light-sensing metal layer. Thus, the light-sensing assembly senses light intensity of surrounding of the display area by electrical signal difference between the top and bottom electrode to provide data for automatic regulation of the display panel. 
     In the embodiment, the light-sensing assembly  20  comprises P-type semiconductor layer  23 , an intrinsic semiconductor layer  24 , and N-type semiconductor layer  25  in order on the light-sensing metal layer  21 . The P-type semiconductor layer  23  is a high-concentration doped P-type intrinsic semiconductor layer (P+α-Si), the intrinsic semiconductor layer  24  is α-Si, and the N-type semiconductor layer is a high-concentration doped N-type intrinsic semiconductor layer (N+α-Si). The three semiconductor layers forms body of the light-sensing assembly to sense light intensity of surrounding of the display area according to the top and bottom electrode. 
     In the embodiment, transparent conducting layers (transparent conducting layer corresponding to the switch assembly  10  does not show in drawings) respectively corresponding to the switch assembly  10  and the light-sensing assembly  20  are disposed on the passivation layer  17 . The two transparent conducting layers are in a same layer using a photomask process, which saves process. The transparent conducting layer forms together, which meets requirement of the switch assembly and requirement of the top electrode of the light-sensing assembly. 
     In the embodiment, the light-sensing metal layer  21  is disposed on the extended portion of the etching barrier layer  11  and the light-sensing assembly  20  is disposed on the light-sensing metal layer  21 . 
     The light-sensing metal layer  21 , the source electrode layer  15 , and the drain electrode layer  16  are in the same layer, which uses one same photomask process. 
       FIG. 3  is a flowchart diagram of a manufacturing method for the display panel of the present disclosure. As shown in  FIG. 3  combined with  FIG. 1  and  FIG. 2 , the present disclosure further provides the manufacturing method for the display panel, where the manufacturing method for the display panel comprises: 
     S 201 : providing the substrate; 
     S 202 : forming the switch assembly on the substrate; the switch assembly comprises the IGZO layer; and 
     S 203 : forming the light-sensing assembly on the side of the switch assembly. 
     Furthermore, the step for forming the switch assembly on the substrate, comprising: 
     providing a glass substrate as the substrate; 
     forming the gate electrode metal layer, the gate insulation layer, the IGZO layer, the etching barrier layer, the source electrode layer, and the drain electrode layer on the substrate in sequence to form the switch assembly; the source electrode layer and the drain electrode layer are in the same layer. 
     Furthermore, the step for forming the switch assembly comprising the IGZO layer on the substrate, comprising 
     forming the etching barrier layer on the IGZO layer; 
     the step for forming a light-sensing assembly on a side of the switch assembly, comprising: forming the light-sensing assembly on the extended portion of the etching barrier layer. 
     Furthermore, the step for forming the light-sensing assembly on the extended portion of the etching barrier layer, comprising: 
     forming the light-sensing metal layer on the extended portion of the etching barrier layer; 
     forming the light-sensing assembly on the light-sensing metal layer; 
     forming the transparent conducting layer on the light-sensing assembly. 
     Furthermore, the step for forming the light-sensing assembly, comprising: 
     forming a P-type semiconductor layer on the light-sensing metal layer; 
     forming an intrinsic semiconductor layer on the P-type semiconductor layer; and 
     forming an N-type semiconductor layer on the intrinsic semiconductor layer. 
     Furthermore, the passivation layer covers the switch assembly and the light-sensing assembly. 
     In this embodiment, the transparent conducting layer is disposed on the passivation layer corresponding to the switch assembly, and the transparent conducting layer is disposed on the passivation layer corresponding to the light-sensing assembly. 
     In this embodiment, a light-sensing metal layer is disposed on the extended portion of the etching barrier layer and the light-sensing assembly is disposed on the light-sensing metal layer. The light-sensing metal layer, the source electrode layer, and the drain electrode layer are in the same layer. 
       FIG. 4  is a schematic diagram of the manufacturing method for the display panel of the embodiment of the present disclosure. As shown in  FIG. 4 , the present disclosure provides the manufacturing method for the display panel, where the manufacturing method for the display panel comprises: 
     S 1 : forming the gate electrode metal layer and the gate insulation layer on the substrate; 
     S 2 : forming the IGZO layer on the gate insulation layer; 
     S 3 : forming the etching barrier layer on the gate insulation layer and the IGZO layer; 
     S 4 : forming the source electrode layer and the drain electrode layer on the etching barrier layer, and forming the light-sensing metal layer on the extended portion of the etching barrier layer; 
     S 5 : forming the P-type semiconductor layer, intrinsic semiconductor layer, and the N-type semiconductor layer on the light-sensing metal layer; 
     S 6 : covering the light-sensing metal layer, the source electrode layer, and the drain electrode layer using the passivation layer; and 
     S 7 : disposing on the passivation layer respectively corresponding to the switch assembly and corresponding to the light-sensing assembly by the transparent conducting layers. 
       FIG. 5  is a schematic diagram of the display apparatus of the embodiment of the present disclosure. As shown in  FIG. 5 , the present disclosure provides the display apparatus  200 , where the display apparatus  200  comprises a driving device  220  and the above display panel  210 . 
     In the embodiment, the display apparatus  200  can be twisted-nematic (TN) type, optical compensated birefringence (OCB) type, vertical-alignment (VA) type, and curved type LCD, which is not limited. 
     It should be understood that the display panel can be OLED, QLED, curved display panel, or other display panel. 
     The above description merely illustrates some exemplary embodiments of the disclosure, which however are not intended to limit the scope of the disclosure to these specific embodiments. Any equivalent structural or flow modifications or transformations made to the disclosure, or any direct or indirect applications of the disclosure on any other related fields, shall all fall in the scope of the disclosure.