Patent ID: 12190628

DETAILED DESCRIPTION

The present disclosure will be described hereinafter in a clear and complete manner in conjunction with the drawings and embodiments. Obviously, the following embodiments merely relate to a part of, rather than all of, the embodiments of the present disclosure, and based on these embodiments, a person skilled in the art may, without any creative effort, obtain the other embodiments, which also fall within the scope of the present disclosure.

In the related art, usually a fingerprint identification module includes a TFT and a photosensitive sensor. As shown inFIG.1, which is a schematic view showing an equivalent circuit of the fingerprint identification module, the fingerprint identification module includes a TFT11and a photosensitive sensor12. A gate electrode of the TFT11is connected to a control line, and the control line is configured to control the TFT to be turned on. A source electrode of the TFT11is connected to a data line, a drain electrode of the TFT11is connected to an upper electrode of the photosensitive sensor12, and a lower electrode of the photosensitive sensor12is connected to a reference voltage REF. When the TFT is turned on under the control of a signal from the control line, a current generated by the photosensitive sensor12is read by a data reading line, and then a fingerprint is identified in accordance with a size of the current. For example, the photosensitive sensor12is a PIN diode.

In the related art, the TFT needs to be connected to the photosensitive sensor through a connection electrode, and usually the connection electrode is manufactured through a separate masking process. Hence, too many masks are used, and it is adverse to the reduction in the manufacture cost of the fingerprint identification module.

In order to solve the above-mentioned problem, as shown inFIG.2, the present disclosure provides in some embodiments a method for manufacturing a fingerprint identification module. The fingerprint identification module includes a TFT and a photosensitive sensor. The method includes: a step S1of forming a semiconductor layer pattern, the semiconductor layer pattern including a first semiconductor pattern and a second semiconductor pattern, the first semiconductor pattern being used as an active layer of the TFT; and a step S2of subjecting the second semiconductor pattern to conductor-formation treatment to form a connection electrode, the connection electrode being used to connect the TFT to the photosensitive sensor.

According to the embodiments of the present disclosure, the first semiconductor pattern serving as the active layer of the TFT and the second semiconductor pattern for forming the connection electrode are formed simultaneously through a single patterning process, so it is able to reduce the quantity of masks for manufacturing the fingerprint identification module, thereby to reduce the manufacture cost thereof.

In a possible embodiment of the present disclosure, prior to forming the semiconductor layer pattern, the method further includes S0aof forming a lower electrode, a PIN layer and an upper electrode of the photosensitive sensor on a substrate sequentially in that order, and the connection electrode is lapped onto the upper electrode.

As shown inFIG.3, the lower electrode102a,the PIN layer103and the upper electrode104of the photosensitive sensor are formed, and then the active layer106aof the TFT and the connection electrode106bare formed. The connection electrode106bis lapped onto the upper electrode104, so as to connect the TFT to the photosensitive sensor.

In the related art, during the manufacture of the fingerprint identification module, usually the TFT is formed, and then the photosensitive sensor is formed, so during the formation of the photosensitive sensor, the active layer of the TFT is probably damaged, and thereby a characteristic of the TFT is adversely affected.

In the embodiments of the present disclosure, during the manufacture of the fingerprint identification module, the photosensitive sensor is formed before a film layer of the TFT, e.g., the active layer is formed, so it is able to prevent the active layer from being damaged during the formation of the photosensitive sensor.

In the related art, such a scheme of connecting the photosensitive sensor to the TFT through a shield metal layer of the TFT as a lapping electrode has been presented. The shield metal layer also shields a portion of the photosensitive sensor while shielding the TFT, so a light-receiving area of the photosensitive sensor is reduced. In this way, a current generated by the photosensitive sensor is reduced, and thereby the sensitivity of the fingerprint identification module is adversely affected.

In a possible embodiment of the present disclosure, the semiconductor layer pattern is made of a transparent semiconductor material, so that the connection electrode is a transparent electrode. At this time, even when the connection electrode is lapped onto the upper electrode of the photosensitive sensor, the light-receiving area of the photosensitive sensor is not adversely affected.

In a possible embodiment of the present disclosure, the transparent semiconductor material is a metal oxide semiconductor material. When the active layer is made of the metal oxide semiconductor material, it is able to improve the characteristic of the TFT.

In a possible embodiment of the present disclosure, the connection electrode is a transparent electrode and reused as an upper electrode of the photosensitive sensor. Prior to forming the semiconductor layer pattern, the method further includes a step S0bof forming a lower electrode and a PIN layer of the photosensitive sensor, and the connection electrode is a transparent electrode and reused as the upper electrode of the photosensitive sensor.

As shown inFIG.4, the lower electrode202aand the PIN layer203of the photosensitive sensor are formed before an active layer205aof the TFT and the connection electrode205bare formed, and the connection electrode205bis reused as the upper electrode of the photosensitive sensor.

In a possible embodiment of the present disclosure, the semiconductor layer pattern is made of a transparent metal oxide semiconductor material. When the active layer is made of the metal oxide semiconductor material, it is able to improve the characteristic of the TFT.

In the embodiments of the present disclosure, during the manufacture of the fingerprint identification module, the lower electrode and the PIN layer of the photosensitive sensor are formed before the active layer of the TFT and the connection electrode reused as the upper electrode of the photosensitive sensor are formed. As a result, it is able to omit a masking process for separately forming the upper electrode of the photosensitive sensor while preventing the active layer from being damaged during the formation of the photosensitive sensor, thereby to reduce the quantity of masks for the manufacture of the fingerprint identification module, the manufacture cost as well as a thickness of the fingerprint identification module.

In the embodiments of the present disclosure, the connection electrode is lapped onto the upper electrode of the photosensitive sensor, or reused as the upper electrode of the photosensitive sensor, and in some other embodiments of the present disclosure, the connection electrode is also connected to the lower electrode of the photosensitive sensor or reused as the lower electrode of the photosensitive sensor, which will be described hereinafter.

In a possible embodiment of the present disclosure, the connection electrode is reused as the lower electrode of the photosensitive sensor.

As shown inFIG.5, the connection electrode303bis reused as the lower electrode of the photosensitive sensor.

In the embodiments of the present disclosure, when the connection electrode is reused as the lower electrode of the photosensitive sensor, it is able to omit the masking process for separately forming the lower electrode of the photosensitive sensor, thereby to reduce the quantity of masks for the manufacture of the fingerprint identification module, and reduce the thickness of the fingerprint identification module.

In some other embodiments of the present disclosure, the connection electrode is not reused as the lower electrode of the photosensitive sensor, but arranged at a same layer as, and connected to, the lower electrode of the photosensitive sensor. Through this structure, it is also able to reduce the thickness of the fingerprint identification module.

In a possible embodiment of the present disclosure, prior to forming the semiconductor layer pattern, the method further includes a step S0cof forming a gate metal layer pattern, and the gate metal layer pattern includes a gate electrode of the TFT and the lower electrode of the photosensitive sensor.

As shown inFIG.3, the gate electrode102bof the TFT is arranged at a same layer, and made of a same material, as the lower electrode102aof the photosensitive sensor, i.e., the gate electrode and the lower electrode are formed through a single patterning process. As shown inFIG.4, the gate electrode202bof the TFT is arranged at a same layer, and made of a same material, as the lower electrode202aof the photosensitive sensor, i.e., the gate electrode and the lower electrode are formed through a single patterning process. As shown inFIG.6, the gate electrode502bof the TFT is arranged at a same layer, and made of a same material, as the lower electrode502aof the photosensitive sensor, i.e., the gate electrode and the lower electrode are formed through a single patterning process.

In the embodiments of the present disclosure, the gate electrode of the TFT and the lower electrode of the photosensitive sensor are formed through a single patterning process, so it is able to further reduce the quantity of masks for the manufacture of the fingerprint identification module, and reduce the thickness of the fingerprint identification module.

In some embodiments of the present disclosure, subsequent to forming the semiconductor layer pattern, the method further includes S13aof forming a source/drain metal layer pattern, the source/drain metal layer pattern merely includes a source electrode, and the connection electrode is connected to the active layer and reused as a drain electrode of the TFT.

As shown inFIG.3, the connection electrode106bis reused as the drain electrode of the TFT. As shown inFIG.4, the connection electrode205bis reused as both the drain electrode of the TFT and the upper electrode of the photosensitive sensor. As shown inFIG.5, the connection electrode303bis reused as both the drain electrode of the TFT and the lower electrode of the photosensitive sensor.

In some embodiments of the present disclosure, subsequent to forming the semiconductor layer pattern, the method further includes forming the source/drain metal layer pattern, the source/drain metal layer pattern includes the source electrode and the drain electrode, and the connection electrode is connected to the active layer and the drain electrode.

As shown inFIG.6, the source/drain metal layer pattern includes the source electrode507aand the drain electrode507b,and the connection electrode506bis connected to the active layer506aand the drain electrode507b.

In the embodiments of the present disclosure, it is able to reduce a resistance of the drain electrode.

In some other embodiments of the present disclosure, the active layer of the TFT is not connected to the connection electrode, and the connection electrode is connected to the drain electrode.

In other words, subsequent to forming the semiconductor layer pattern, the method further includes a step S13cof forming the source/drain metal layer pattern, the source/drain metal layer pattern includes the source electrode and the drain electrode, and the connection electrode is separated from the active layer and connected to the drain electrode. As shown inFIG.9, the connection electrode is separated from the active layer through an insulation structure509.

In a possible embodiment of the present disclosure, the semiconductor layer pattern is made of a metal oxide semiconductor, e.g., Indium Gallium Zinc Oxide (IGZO), Indium Tin Zinc Oxide (ITZO), or Indium Zinc Oxide (IZO), so as to improve the performance of the TFT.

In the embodiments of the present disclosure, for the conductor-formation treatment, the semiconductor pattern is subjected to plasma treatment using NH3or H2, or subjected to ion doping treatment.

The method for manufacturing the fingerprint identification module will be described illustratively hereinafter.

In some embodiments of the present disclosure, the method for manufacturing the fingerprint identification module includes the following steps.

Step S21: forming a gate metal layer on a substrate101and patterning the gate metal layer to form the gate electrode102bof the TFT and the lower electrode102aof the photosensitive sensor, as shown inFIG.7A.

In the embodiments of the present disclosure, the substrate is a glass substrate or a flexible Polyimide (PI) substrate, and the gate metal layer is made of Al, Mo, AlNd, Cu or MoNb.

In this step, one mask (mask1) is adopted.

Step S22: performing a PIN process on the lower electrode102aand patterning, so as to form the PIN layer103and the upper electrode104of the photosensitive sensor, as shown inFIG.7B.

The PIN layer103includes an intrinsic amorphous silicon layer having a thickness of 600 nm to 1200 nm and a P-doped amorphous silicon layer having a thickness of 10 nm to 100 nm. The upper electrode104is made of a transparent metal oxide, e.g., Indium Tin Oxide (ITO), and has a thickness of 20 nm to 80 nm.

In this step, two masks (masks2and3) are adopted.

Step S23: depositing a gate insulation layer (GI layer) and forming a via-hole in the gate insulation layer at a position above the upper electrode104, as shown inFIG.7C.

The gate insulation layer is made of SiO2, or two layers of SiNx and SiO2respectively, and has a thickness of 200 nm to 400 nm.

In this step, one mask (mask4) is adopted.

Step S24: forming the semiconductor layer pattern106. The semiconductor pattern106includes a first semiconductor pattern106aand a second semiconductor pattern106b′, and the first semiconductor pattern106ais used as the active layer of the TFT, as shown inFIG.7D.

The semiconductor layer pattern106is made of a metal oxide semiconductor material, e.g., IGZO, ITZO or IZO, in an amorphous state, a crystalline state, or two layers of the amorphous state and the crystalline state respectively, and has a thickness of 30 nm to 70 nm.

In this step, one mask (mask5) is adopted.

Step S25: subjecting the second semiconductor pattern1062to the conductor-formation treatment to form the connection electrode106b,as shown inFIG.7E.

For the conductor-formation treatment, the semiconductor pattern is subjected to plasma treatment using NH3or H2, or subjected to ion-doping treatment.

In this step, one mask (mask6) is adopted.

Step S26: forming a source/drain metal layer pattern. The source/drain metal layer pattern merely includes a source electrode107, and no source/drain metal layer pattern is formed on the connection electrode106b,as shown inFIG.7F.

The source/drain metal layer is made of Al, Mo, AlNd, Cu or MoNb, or an alloy of two or more of Al, Mo, AlNd, Cu and MoNb, and has a thickness of 300 nm to 500 nm.

In this step, one mask (mask7) is adopted.

Step S27: forming a passivation (PVX) layer108, as shown inFIG.7G.

The PVX layer is made of SiO2, SiON, or both, and has a thickness of 300 Å to 400 Å.

In some embodiments of the present disclosure, another method for manufacturing the fingerprint identification module includes the following steps.

Steps S31to S35are the same as S21to S25mentioned hereinabove, and thus will not be particularly further defined herein.

Step S36: forming the source/drain metal layer pattern, the source/drain metal layer pattern merely including a source electrode507aand a drain electrode507b,as shown inFIG.8A.

The source/drain metal layer is made of Al, Mo, AlNd, Cu or MoNb, or an alloy of two or more of Al, Mo, AlNd, Cu and MoNb, and has a thickness of 300 nm to 500 nm.

In the embodiments of the present disclosure, the drain electrode507bis formed on the connection electrode506b,so as to reduce the resistance of the connection electrode.

Step S37: forming a passivation (PVX) layer508, as shown inFIG.8B.

The PVX layer is made of SiO2, SiON, or both, and has a thickness of 300 Å to 400 Å.

According to the embodiments of the present disclosure, the first semiconductor pattern for forming the active layer of the TFT and the second semiconductor pattern for forming the connection electrode are formed simultaneously through a single patterning process, so as to reduce the quantity of masks for the fingerprint identification module, thereby to reduce the manufacture cost. In addition, the photosensitive sensor is formed before the gate insulation layer, the active layer, the source/drain metal pattern and the PVX layer associated with the TFT are formed, so it is able to prevent the characteristic of the TFT from being adversely affected by the process for forming the photosensitive sensor. The semiconductor layer pattern is made of a transparent metal oxide, so as to enable the connection electrode to be a transparent electrode, thereby to increase a light-receiving area of the photosensitive sensor. The lower electrode of the photosensitive sensor and the gate electrode of the TFT share a same metal layer, so it is able to reduce the quantity of film layers. Further, as compared with a manufacture process in the related art, seven masks are used in the embodiments of the present disclosure, it is able to remarkably shorten the manufacture process.

The present disclosure further provides in some embodiments a fingerprint identification module, which includes a TFT, a photosensitive sensor, and a connection electrode configured to connect the TFT to the photosensitive sensor. The TFT includes an active layer formed through a same semiconductor layer pattern as the connection electrode, the semiconductor layer pattern includes a first semiconductor pattern and a second semiconductor pattern, the first semiconductor pattern is used as the active layer, and the second semiconductor pattern is used as the connection electrode after conductor-formation treatment.

According to the embodiments of the present disclosure, the semiconductor pattern for forming the active layer of the TFT and the semiconductor pattern for forming the connection electrode are formed simultaneously through a single patterning process, so as to reduce the quantity of masks for the fingerprint identification module, thereby to reduce the manufacture cost.

In a possible embodiment of the present disclosure, the photosensitive sensor includes a lower electrode, a PIN layer and an upper electrode, and the connection electrode is lapped onto the upper electrode.

In a possible embodiment of the present disclosure, the semiconductor layer pattern is made of a transparent semiconductor material, so that the connection electrode is a transparent electrode. At this time, even when the connection electrode is lapped onto the photosensitive sensor, the light-receiving area of the photosensitive sensor is not adversely affected.

In a possible embodiment of the present disclosure, the transparent semiconductor material is a metal oxide semiconductor material. When the active layer is made of the metal oxide semiconductor material, it is able to improve the characteristic of the TFT.

As shown inFIG.3, the fingerprint identification module includes a substrate101, a gate metal layer pattern, a PIN layer103, an upper electrode104, a gate insulation layer105, an active layer106a,a connection electrode106b,a source/drain metal layer pattern, and a PVX layer108.

The substrate is a glass substrate or a flexible PI substrate.

The gate metal layer pattern includes a gate electrode102bof the TFT and a lower electrode102aof the photosensitive sensor. The gate metal layer is made of Al, Mo, AlNd, Cu or MoNb.

The PIN layer103includes an intrinsic amorphous silicon layer having a thickness of 600 nm to 1200 nm and a P-doped amorphous silicon layer having a thickness of 10 nm to 100 nm.

The upper electrode104is made of a transparent metal oxide, e.g., ITO, and has a thickness of 20 nm to 80 nm.

A via-hole is formed in the gate insulation layer105at a position above the upper electrode104. The gate insulation layer is made of SiO2, or both SiNx and SiO2, and has a thickness of 200 nm to 400 nm.

The active layer106aand the connection electrode106bare formed through a same semiconductor layer pattern. The semiconductor layer pattern includes a first semiconductor pattern and a second semiconductor pattern, the first semiconductor pattern is used as the active layer106a,and the second semiconductor pattern is used as the connection electrode106bafter conductor-formation treatment. The connection electrode106bis lapped onto the upper electrode104of the photosensitive sensor through the via-hole in the gate insulation layer105, and the connection electrode106is a transparent electrode. The semiconductor layer pattern is made of a metal oxide semiconductor material, e.g., IGZO, ITZO or IZO, in an amorphous state, a crystalline state, or two layers of the amorphous state and the crystalline state respectively, and has a thickness of 30 nm to 70 nm.

The source/drain metal layer pattern includes a source electrode107. The source/drain metal layer is made of Al, Mo, AlNd, Cu or MoNb, or an alloy of two or more of Al, Mo, AlNd, Cu and MoNb, and has a thickness of 300 nm to 500 nm.

The PVX layer108is made of SiO2, SiON, or both, and has a thickness of 300 Å to 400 Å.

In a possible embodiment of the present disclosure, the connection electrode is a transparent electrode, and reused as the upper electrode of the photosensitive sensor.

In a possible embodiment of the present disclosure, the semiconductor layer pattern is made of a transparent metal oxide semiconductor material. When the active layer is made of a metal oxide semiconductor material, it is able to improve the characteristic of the TFT.

As shown inFIG.4, the fingerprint identification module includes a substrate201, a gate metal layer pattern, a PIN layer203, a gate insulation layer204, an active layer205a,a connection electrode205b,a source/drain metal layer pattern, and a PVX layer207.

The substrate is a glass substrate or a flexible PI substrate.

The gate metal layer pattern includes a gate electrode202bof the TFT and a lower electrode202aof the photosensitive sensor. The gate metal layer is made of Al, Mo, AlNd, Cu or MoNb.

The PIN layer203includes an intrinsic amorphous silicon layer having a thickness of 600 nm to 1200 nm and a P-doped amorphous silicon layer having a thickness of 10 nm to 100 nm.

A via-hole is formed in the gate insulation layer204at a position above the PIN layer203. The gate insulation layer204is made of SiO2, or both SiNx and SiO2, and has a thickness of 200 nm to 400 nm.

The active layer205aand the connection electrode205bare formed through a same semiconductor layer pattern. The semiconductor layer pattern includes a first semiconductor pattern and a second semiconductor pattern, the first semiconductor pattern is used as the active layer205a,and the second semiconductor pattern is used as the connection electrode205bafter conductor-formation treatment. The connection electrode205bis a transparent electrode and reused as the upper electrode of the photosensitive sensor. The semiconductor layer pattern is made of a metal oxide semiconductor material, e.g., IGZO, ITZO or IZO, in an amorphous state, a crystalline state or two layers of the amorphous state and the crystalline state respectively, and has a thickness of 30 nm to 70 nm.

The source/drain metal layer pattern includes a source electrode206. The source/drain metal layer is made of Al, Mo, AlNd, Cu or MoNb, or an alloy of two or more of Al, Mo, AlNd, Cu and MoNb, and has a thickness of 300 nm to 500 nm.

The PVX layer207is made of SiO2, SiON, or both, and has a thickness of 300 Å to 400 Å.

In the embodiments of the present disclosure, the connection electrode is lapped onto or reused as the upper electrode of the photosensitive sensor, and in some other embodiments of the present disclosure, the connection electrode is connected to, or reused as, the lower electrode of the photosensitive sensor, which will be described hereinafter.

In a possible embodiment of the present disclosure, the connection electrode is reused as the lower electrode of the photosensitive sensor.

As shown inFIG.5, the fingerprint identification module includes a substrate301, a buffer layer302, an active layer303a,a connection electrode303b,a source connecting region303c,a PIN layer304, an upper electrode305, a gate insulation layer306, a gate metal layer pattern, and interlayer dielectric layer (ILD)308, a first connecting member309, a source/drain metal layer pattern, and a PVX layer311.

The substrate301is a glass substrate or a flexible PI substrate.

The active layer303a,the connection electrode303band the source connecting region303care formed through a same semiconductor layer pattern. The semiconductor layer pattern includes a first semiconductor pattern, a second semiconductor pattern and a third semiconductor pattern. The first semiconductor pattern is used as the active layer303a,the second semiconductor pattern is used as the connection electrode303bafter conductor-formation treatment, and the third semiconductor pattern is used as the source connecting region303cafter conductor-formation treatment. The connection electrode303bis reused as a drain electrode of the TFT and a lower electrode of the photosensitive sensor. The semiconductor layer pattern is made of a metal oxide semiconductor material, e.g., IGZO, ITZO or IZO, in an amorphous state, a crystalline state, or two layers of the amorphous state and the crystalline state respectively, and has a thickness of 30 nm to 70 nm.

The PIN layer304includes an intrinsic amorphous silicon layer having a thickness of 600 nm to 1200 nm and a P-doped amorphous silicon layer having a thickness of 10 nm to 100 nm.

The upper electrode305is made of a transparent metal oxide, e.g., ITO, and has a thickness of 20 nm to 80 nm.

A via-hole is formed in the gate insulation layer306at a position above the upper electrode305. The gate insulation layer204is made of SiO2, or both SiNx and SiO2, and has a thickness of 200 nm to 400 nm.

The gate metal layer pattern includes a gate electrode307of the TFT, and it is made of Al, Mo, AlNd, Cu or MoNb.

A via-hole is formed in the interlayer dielectric layer308at a position above the via-hole in the gate insulation layer306and communicates with the via-hole in the gate insulation layer306.

The first connection member309is connected to the upper electrode305through the via-hole in the interlayer dielectric layer308and the gate insulation layer306.

The source/drain metal layer pattern includes a source electrode310aand a second connection member310b.The source/drain metal layer pattern is made of Al, Mo, AlNd, Cu or MoNb, or an alloy of two or more of Al, Mo, AlNd, Cu and MoNb, and has a thickness of 300 nm to 500 nm. In some embodiments of the present disclosure, no first connection member309is provided, and the second connection member310bis directly connected to the upper electrode305through the via-hole in the interlayer dielectric layer308and the gate insulation layer306.

The PVX layer311is made of SiO2, SiON, or both, and has a thickness of 300 Å to 400 Å.

In the embodiments of the present disclosure, when the connection electrode is reused as the lower electrode of the photosensitive sensor, it is able to omit the masking process for separately forming the lower electrode of the photosensitive sensor, thereby to reduce the quantity of masks for the manufacture of the fingerprint identification module, and reduce the thickness of the fingerprint identification module.

In some other embodiments of the present disclosure, the connection electrode is not reused as the lower electrode of the photosensitive sensor, but arranged at a same layer as, and connected to, the lower electrode of the photosensitive sensor. Through this structure, it is also able to reduce the thickness of the fingerprint identification module.

In some embodiments of the present disclosure, the TFT includes a gate electrode arranged at a same layer, and made of a same material, as the lower electrode of the photosensitive sensor, as shown inFIGS.3,4and6. InFIG.3, the gate electrode102bof the TFT is arranged at a same layer, and made of a same material, as the lower electrode102aof the photosensitive sensor, and the gate electrode and the lower electrode are formed through a single patterning process. InFIG.4, the gate electrode202bof the TFT is arranged at a same layer, and made of a same material, as the lower electrode202aof the photosensitive sensor, and the gate electrode and the lower electrode are formed through a single patterning process. InFIG.6, the gate electrode502bof the TFT is arranged at a same layer, and made of a same material, as the lower electrode502aof the photosensitive sensor, and the gate electrode and the lower electrode are formed through a single patterning process.

In the embodiments of the present disclosure, the gate electrode of the TFT and the lower electrode of the photosensitive sensor are formed through a single patterning process, so it is able to further reduce the quantity of masks for the manufacture of the fingerprint identification module, and reduce the thickness of the fingerprint identification module.

In some embodiments of the present disclosure, the connection electrode is connected to the active layer, and reused as the drain electrode of the TFT. As shown inFIG.3, the connection electrode106bis reused as the drain electrode of the TFT. As shown inFIG.4, the connection electrode205bis reused as the drain electrode of the TFT and the upper electrode of the photosensitive sensor. As shown inFIG.5, the connection electrode303bis reused as the drain electrode of the TFT and the lower electrode of the photosensitive sensor.

In some embodiments of the present disclosure, the connection electrode is connected to the active layer and the drain electrode of the TFT. As shown inFIG.6, the source/drain metal layer pattern includes the source electrode507aand the drain electrode507b,and the connection electrode506bis connected to the active layer506aand the drain electrode507b.Through this structure, it is able to reduce a resistance of the drain electrode.

In some embodiments of the present disclosure, the connection electrode is separated from the active layer, and the drain electrode of the TFT is connected to the connection electrode.

In a possible embodiment of the present disclosure, the semiconductor layer pattern is made of a metal oxide semiconductor material, e.g., IGZO, ITZO or IZO, so as to improve the performance of the TFT.

The present disclosure further provides in some embodiments a display substrate including the above-mentioned fingerprint identification module.

The present disclosure further provides in some embodiments a display device including the above-mentioned display substrate.

The embodiments of the present disclosure are described above with reference to the accompanying drawings, but the present disclosure is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Under the teaching of the present disclosure, a person skilled in the art may implement many forms without departing from the principle of the present disclosure and the protection scope of the claims, which also fall within the scope of the present disclosure.