CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese Patent Application No. 201910941144.X, filed on Sep. 30, 2019, which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of display technologies, and in particular, to a substrate and a method for manufacturing the same, and a display device.

BACKGROUND

An under-screen fingerprint identification technology is a technology for collecting texture information (e.g., fingerprint information) by using texture identifiers disposed under a touch screen and identifying the collected texture information. At present, the under-screen fingerprint identification technology is widely used in fingerprint locks, fingerprint attendance machines and various display devices.

SUMMARY

In one aspect, a substrate is provided. The substrate includes a base, and a first insulating layer and a plurality of texture identifiers that are disposed on the base. The first insulating layer includes a plurality of via holes extending toward the base from a surface of the first insulating layer facing away from the base. At least a part of each texture identifier is located within a respective one of the plurality of via holes. The texture identifier is configured to detect texture information.

In some embodiments, the substrate further includes a plurality of first thin film transistors disposed on the base. At least one first thin film transistor includes a first gate, a first active pattern, a portion of the first insulating layer located in the first thin film transistor, a first source and a first drain. And one of the first source and the first drain is electrically connected to at least one corresponding texture identifier.

In some embodiments, the plurality of via holes penetrate the first insulating layer. The texture identifier includes a first electrode, a texture identification functional layer and a second electrode. The first electrode is disposed on a side of the first insulating layer proximate to the base. The texture identification functional layer is disposed on a surface of the first electrode facing away from the base, at least a part of the texture identification functional layer is disposed in a corresponding via hole. The second electrode is disposed on a surface of the texture identification functional layer facing away from the base. An area of an orthographic projection of the first electrode on the base is greater than an area of an orthographic projection of the second electrode on the base. The first insulating layer is disposed between the first electrode and a layer including the first source and the first drain. The first insulating layer has a plurality of first through holes, and one of the first source and the first drain is electrically connected to a corresponding first electrode through a corresponding first through hole.

In some embodiments, the substrate further includes a plurality of second storage electrodes, each second storage electrode is disposed between the first electrode and the base. In the thickness direction of the base, the orthographic projection of the first electrode on the base overlaps with an orthographic projection of the second storage electrode on the base.

In some embodiments, the second storage electrode and the first gate are disposed in a same layer, and are made of a same material. Or, the second storage electrode and the first active pattern are disposed in a same layer; the first active pattern has a first channel region, and a first source region and a first drain region that are located on two opposite sides of the first channel region, and an orthographic projection of a portion of the first active pattern located in the first channel region on the base overlaps with an orthographic projection of the first gate on the base. The first source is electrically connected to a portion of the first active pattern located in the first source region, and the first drain is electrically connected to a portion of the first active pattern located in the first drain region. The second storage electrode, the portion of the first active pattern located in the first source region, and the portion of the first active pattern located in the first drain region are made of a same material.

In some embodiments, the substrate further includes a plurality of pixel driver circuits disposed on the base, at least one pixel driver circuit includes at least one second thin film transistor. The second thin film transistor includes a second gate, a second active pattern, a portion of the first insulating layer located in the second thin film transistor, a second source and a second drain. The second gate and the first gate are disposed in a same layer, the second active pattern and the first active pattern are disposed in a same layer, and the second source, the second drain, the first source and the first drain are disposed in a same layer.

In some embodiments, the pixel driver circuit further includes a third storage electrode. In the thickness direction of the base, an orthographic projection of the third storage electrode on the base overlaps with an orthographic projection of the second gate on the base. The second thin film transistor is a driving transistor.

In some embodiments, the second gate is disposed on a side of the second active pattern away from the base. The third storage electrode is disposed on a side of the second gate away from the base, and the third storage electrode is disposed in a same layer as the first electrode.

In some embodiments, the third storage electrode is disposed on a surface of the first insulating layer proximate to the base. The substrate further includes a first gate insulating layer disposed between the third storage electrode and the second gate.

In some embodiments, the substrate further includes a plurality of light-emitting devices disposed on a side of the plurality of pixel driver circuits away from the base. An anode of each light-emitting device is electrically connected to a corresponding pixel driver circuit.

In some embodiments, the substrate further includes a planarization layer disposed on a side of the plurality of texture identifiers away from the base. In the thickness direction of the base, a thickness of the planarization layer is in a range of 1.2 μm to 1.8 μm.

In some embodiments, the substrate further includes a protective layer disposed on a surface of the planarization layer proximate to the base. The protective layer is made of an inorganic insulating material, and the planarization layer is made of an organic insulating material.

In another aspect, a display device is provided. The display device includes the above substrate.

In yet another aspect, a method for manufacturing the above substrate is provided. The method includes: forming the first insulating layer on the base, the first insulating layer including a plurality of via holes extending toward the base from a surface of the first insulating layer facing away from the base; and forming the plurality of texture identifiers on the base, at least a part of each texture identifier being located within a corresponding via hole in the thickness direction of the base.

In some embodiments, the method further includes: forming a plurality of first thin film transistors on the base. Each first thin film transistor includes a first gate, a first active pattern, a portion of the first insulating layer located in the first thin film transistor, a first source and a first drain. One of the first source and the first drain is electrically connected to at least one corresponding texture identifier.

In some embodiments, the first source and the first drain are formed directly after the first insulating layer is formed. Before forming the first insulating layer, the method further includes: forming a plurality of first storage capacitors, each first storage capacitor including a second storage electrode and a first storage electrode that are sequentially formed on the base in the thickness direction of the base. After forming the first insulating layer, forming the plurality of texture identifiers includes: forming texture identification functional layers each on a corresponding first storage capacitor; and forming second electrodes each on a corresponding texture identification functional layer.

In some embodiments, forming the second storage electrode and the first gate includes: forming a metal film on the base; and performing a patterning process on the metal film to form the second storage electrode and the first gate.

In some embodiments, forming the second storage electrode, the first active pattern and the first gate includes: forming a semiconductor film on the base; performing a patterning process on the semiconductor film to form a semiconductor layer, the semiconductor layer including a first semiconductor pattern and a first transition pattern; forming a second gate insulating film on the base on which the semiconductor layer has been formed; forming the first gate on the base on which the second gate insulating film has been formed, an orthographic projection of the first gate on the base overlapping with an orthographic projection of a portion of the first semiconductor pattern on the base; and performing a conductivizing process on a portion of the first semiconductor pattern that is not covered by the first gate and the first transition pattern, to respectively form the first active pattern and the second storage electrode.

In some embodiments, the method further includes: forming a plurality of pixel driver circuits, each pixel driver circuit including at least one second thin film transistor; and each second thin film transistor including a second gate, a second active pattern, a portion of the first insulating layer located in the second thin film transistor, a second source and a second drain. The second gate and the first gate are formed through a same patterning process; the second active pattern, the first active pattern and the second storage electrode are formed through a same patterning process and a same conductivizing process; and the second source, the second drain, the first source and the first drain are formed through a same patterning process.

In some embodiments, the pixel driver circuit further includes a second storage capacitor. The second storage capacitor includes a fourth storage electrode and a third storage electrode that are sequentially formed on the base in the thickness direction of the base. The second thin film transistor is a driving transistor, and the fourth storage electrode is further used as the second gate. Forming the first thin film transistor, the second thin film transistor, the first storage electrode and the second storage electrode includes: forming the semiconductor film on the base; performing a first patterning process on the semiconductor film to form the semiconductor layer, the semiconductor layer including the first semiconductor patterns, the first transition patterns and second semiconductor patterns; forming the second gate insulating film on the base on which the semiconductor layer has been formed; forming a first metal film on the base on which the second gate insulating film has been formed, performing a second patterning process on the first metal film to form the first gate and the second gate, the orthographic projection of the first gate on the base overlapping with an orthographic projection of a portion of the first semiconductor pattern on the base, and an orthographic projection of the second gate on the base overlapping with an orthographic projection of a portion of the second semiconductor pattern on the base; performing a conductivizing process on the portion of the first semiconductor pattern that is not covered by the first gate, a portion of the second semiconductor pattern that is not covered by the second gate and the first transition pattern, so as to respectively form the first active pattern, the second active pattern and the second storage electrode; forming a first gate insulating film on the base on which the first active pattern, the second active pattern and the second storage electrode have been formed; forming a second metal film on the base on which the first gate insulating film has been formed, performing a third patterning process on the second metal film to form the first storage electrode and the third storage electrode; forming a first insulating film on the base on which the first storage electrode and the third storage electrode have been formed; performing a fourth patterning process on the first insulating film, the first gate insulating film and the second gate insulating film, so as to form the via holes and a first through hole penetrating the first insulating film, and a second through hole, a third through hole, a fourth through hole and a fifth through hole penetrating the first insulating film, the first gate insulating film and the second gate insulating film, thereby sequentially obtaining the first insulating layer, a first gate insulating layer and a second gate insulating layer; forming a third metal film on the base on which the first insulating film has been formed, and performing a fifth patterning process on the third metal film to form the first source, the first drain, the second source and the second drain, the first drain and the first source being in contact with a portion of the first active pattern that is not covered by the first gate through the second through hole and the third through hole respectively, the second drain and the second source being in contact with a portion of the second active pattern that is not covered by the second gate through the fourth through hole and the fifth through hole respectively, and one of the first drain and the first source being electrically connected to the first storage electrode through the first through hole.

