Display substrate, display panel and display device

Abstract

The application relates to the technical field of display devices, and discloses a display substrate, a display panel and a display device, the display substrate comprising a substrate, a plurality of first display signal lines, a plurality of second display signal lines and a plurality of reading signal lines on the substrate, the first display signal lines extending along a first direction, the second display signal lines and the reading signal lines extending along a second direction, the first direction intersecting the second direction, the plurality of second display signal lines being located on a side of the first display signal lines away from the substrate, and the plurality of reading signal lines being located on a side of the second display signal lines away from the first display signal lines; the orthographic projection of the plurality of second display signal lines on the substrate completely covers the orthographic projection of the plurality of reading signal lines on the substrate; and the second display signal lines have stable electric signals when the reading signal lines work. The display substrate can reduce the noise on the reading signal lines and ensure the definition of fingerprint imaging.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display device, in particular to a display substrate, a display panel and a display device. BACKGROUND

[0002] In the fingerprint identification technology, the PIN photodiode as a component device of the optical sensing assembly is an important evaluation index of low noise and high signal-to-noise ratio. When the optical sensing assembly is integrated in the light-emitting unit array of the display substrate, due to the complex signal and wiring design, the noise of the optical sensing assembly increases obviously, which seriously reduces the signal-to-noise ratio of the optical sensing assembly and affects the clarity of the fingerprint imaging. Among them, the main reason is that the signal reading line (read line) connected on the optical sensing assembly is very sensitive, and the noise increases seriously after being disturbed. SUMMARY

[0003] The present application provides a display substrate, a display panel and a display device, which can reduce the noise on the reading signal line and ensure the clarity of the fingerprint imaging.

[0004] To achieve the above purpose, the present application provides the following technical scheme:

[0005] A display substrate, comprising a substrate substrate and a plurality of light-emitting units, a plurality of optical sensing assemblies, a plurality of first display signal lines, a plurality of second display signal lines and a plurality of reading signal lines on the substrate substrate;

[0006] A plurality of said light-emitting units are arranged in an array on the substrate substrate, each said light-emitting unit comprises an anode, a light-emitting layer and a cathode formed in order on the substrate substrate; said optical sensing assembly comprises a photosensitive device, each said photosensitive device is located between two adjacent said anodes; a plurality of said first display signal lines and a plurality of said second display signal lines are used to transmit driving electrical signals for driving a plurality of said light-emitting units to emit light, a plurality of said reading signal lines are used to read fingerprint identification electrical signals emitted by said photosensitive device, said first display signal line extends along a first direction, said second display signal line and said reading signal line extend along a second direction, said first direction intersects said second direction; wherein,

[0007] A plurality of said first display signal lines, a plurality of said second display signal lines and a plurality of said reading signal lines are in different layers and insulated from each other, and a plurality of said second display signal lines are located on the side of said first display signal line away from said substrate substrate, a plurality of said reading signal lines are located on the side of said second display signal line away from said first display signal line; the orthographic projection of a plurality of said second display signal lines on the substrate substrate completely covers the orthographic projection of a plurality of said reading signal lines on the substrate substrate; when said reading signal line works, said second display signal line has a stable electrical signal.

[0008] In the display substrate, the plurality of optical sensing components are integrated in the light emitting unit array, the plurality of first display signal lines, the plurality of second display signal lines and the plurality of reading signal lines are arranged in different layers, the plurality of reading signal lines are located on the side of the second display signal lines away from the first display signal lines, the orthographic projection of the plurality of second display signal lines on the substrate completely covers the orthographic projection of the plurality of reading signal lines on the substrate, and the second display signal lines have stable electrical signals when the reading signal lines work, so that the second display signal lines can isolate the reading signal lines from the first display signal lines, shield the reading signal lines to a certain extent, reduce the coupling capacitance between the reading signal lines and the first display signal lines, and further reduce the interference intensity of the reading signal lines. When the plurality of optical sensing components perform fingerprint scanning, the noise on the reading signal lines can be reduced when the reading signal lines read the fingerprint identification electrical signals emitted by the photosensitive devices, the signal-to-noise ratio can be improved, and the clarity of the fingerprint image can be ensured.

[0009] Optionally, the optical sensing component further comprises a switch tube, an input end of the photosensitive device inputs a reverse bias voltage signal, an output end of the photosensitive device is electrically connected with a source electrode of the switch tube, a drain electrode of the switch tube is electrically connected with the reading signal line, and a gate electrode of the switch tube is electrically connected with a driving device.

[0010] Optionally, the display substrate comprises a plurality of gate lines extending in a first direction, a plurality of data lines extending in a second direction, and a plurality of pixel driving circuits located at intersections of the plurality of gate lines and the plurality of data lines. Each of the pixel driving circuits is electrically connected with the gate lines and the data lines, and a plurality of anodes of the plurality of light emitting units are electrically connected with the plurality of pixel driving circuits one by one, so as to drive the light emitting units to emit light.

[0011] Optionally, the second display signal line comprises a first power signal line extending in the second direction, and the first power signal line is used to provide a stable constant voltage signal for the pixel driving circuit.

[0012] Optionally, the second display signal line comprises the data line, and the data line and the reading signal line work in time division.

[0013] Optionally, the first display signal line comprises the gate line extending in the first direction, an initialization signal line, a reset signal line and a second power signal line.

[0014] Optionally, the reset signal line, the gate line and the gate electrode of the switch tube are arranged in the same layer, the initialization signal line and the second power signal line are located between the metal layer where the gate electrode of the switch tube is located and the metal layer where the switch tube and the source electrode and the drain electrode are located.

[0015] Optionally, the second display signal line is arranged in the same layer as the source and the drain of the switch tube.

[0016] Optionally, the reading signal line and the photosensitive device are located on the side of the switch tube away from the substrate.

[0017] The present application also provides a display panel comprising any one of the display substrates provided in the technical solutions.

[0018] The present application also provides a display device comprising a display panel provided in the technical solutions. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structural schematic diagram of a display substrate provided by an embodiment of the present application is shown in the figure.

[0020] Figure 2 A sectional view of a display panel provided by an embodiment of the present application is shown in the figure.

[0021] Figure 3 A circuit diagram of a display panel provided by an embodiment of the present application is shown in the figure.

[0022] Figure 4 A circuit diagram of an optical sensing assembly provided by an embodiment of the present application is shown in the figure.

[0023] Icon:

[0024] 1 - substrate; 2 - light emitting unit; 21 - anode; 22 - light emitting layer; 23 - cathode; 3 - optical sensing assembly; 31 - photosensitive device; 311 - sensor gate line; 32 - switch tube; 321 - source; 322 - drain; 323 - gate; 4 - first display signal line; 41 - gate line; 42 - initialization signal line; 43 - reset signal line; 44 - second power signal line; 5 - second display signal line; 51 - first power signal line; 52 - data line; 6 - reading signal line; 7 - light emitting signal line; 8 - pixel driving circuit. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0026] Please refer to Figure 1 and Figure 2The display substrate provided by the embodiment of the present application comprises a substrate 1 and a plurality of light emitting units 2, a plurality of optical sensing components 3, a plurality of first display signal lines 4, a plurality of second display signal lines 5 and a plurality of reading signal lines 6 on the substrate 1.

[0027] The plurality of light emitting units 2 are arranged in an array on the substrate 1, each of the light emitting units 2 comprises an anode 21, a light emitting layer 22 and a cathode 23 formed on the substrate 1 in sequence, the optical sensing component 3 comprises a photosensitive device 31, each of the photosensitive devices 31 is located between two adjacent anodes 21, the plurality of first display signal lines 4 and the plurality of second display signal lines 5 are used for transmitting driving electrical signals for driving the plurality of light emitting units 2 to emit light, the plurality of reading signal lines 6 are used for reading fingerprint identification electrical signals emitted by the photosensitive devices 31, the first display signal lines 4 extend along a first direction, the second display signal lines 5 and the reading signal lines 6 extend along a second direction, and the first direction intersects the second direction.

[0028] The plurality of first display signal lines 4, the plurality of second display signal lines 5 and the plurality of reading signal lines 6 are in different layers and insulated from each other, the plurality of second display signal lines 5 are located on a side of the first display signal lines 4 away from the substrate 1, and the plurality of reading signal lines 6 are located on a side of the second display signal lines 5 away from the first display signal lines 4, the plurality of second display signal lines 5 are located on the substrate 1, and the orthographic projection of the plurality of second display signal lines 5 on the substrate 1 completely covers the orthographic projection of the plurality of reading signal lines 6 on the substrate 1, and the second display signal lines 5 have stable electrical signals when the reading signal lines 6 work.

[0029] In the display substrate provided by the above embodiment, the plurality of optical sensing components 3 are integrated in the array of the light emitting units 2, the plurality of first display signal lines 4, the plurality of second display signal lines 5 and the plurality of reading signal lines 6 are arranged in different layers, the plurality of reading signal lines 6 are located on a side of the second display signal lines 5 away from the first display signal lines 4, the orthographic projection of the plurality of second display signal lines 5 on the substrate 1 completely covers the orthographic projection of the plurality of reading signal lines 6 on the substrate 1, the second display signal lines 5 have stable electrical signals when the reading signal lines 6 work, the second display signal lines 5 can isolate the reading signal lines 6 from the first display signal lines 4, and the second display signal lines 5 can shield and protect the reading signal lines 6, thereby reducing the coupling capacitance between the reading signal lines 6 and the first display signal lines 4, further reducing the interference intensity of the reading signal lines 6, reducing the noise on the reading signal lines 6 when the reading signal lines 6 read the fingerprint identification electrical signals emitted by the photosensitive devices 31 in the process of fingerprint scanning by the plurality of optical sensing components 3, improving the signal-to-noise ratio, and ensuring the clarity of the fingerprint image.

[0030] As Figure 2 , Figure 3 and Figure 4As shown, the optical sensing component 3 further comprises a switching tube 32, the input end (B end) of the photosensitive device 31 inputs a reverse bias voltage signal, specifically, the input end of the photosensitive device 31 is electrically connected with a sensor gate line (Sensor Gate) 311 to realize the access of the reverse bias voltage signal; the output end of the photosensitive device 31 is electrically connected with the source electrode (S end) 321 of the switching tube 32, the drain electrode (D end) 322 of the switching tube 32 is electrically connected with a read signal line 6 (Read Line) 6, and the gate electrode (G end) of the switching tube 32 is electrically connected with a driving device. Specifically, the photosensitive device 31 can be a PIN photosensitive diode, and the switching tube 32 can be a thin film transistor. As shown in the figure, Figure 4 As shown, when the gate electrode (G end) of the switching tube 32 is opened, the light signal of the photosensitive device 31 enters the driving IC through the drain electrode (D end) of the switching tube 32 and the read signal line 6, to realize the reading of the fingerprint recognition electrical signal. The above-mentioned driving device can be a GOA unit or a driving IC, which can control the opening and closing of the gate electrode (G end) of the switching tube 32, and further control the reading state of the read signal line 6 to the fingerprint recognition electrical signal.

[0031] Specifically, as shown in the figure, Figure 2 As shown, a buffer layer can be arranged between the substrate 1 and the switching tube 32, an active layer in the switching tube 32 is formed on the buffer layer, the gate electrode 323 of the switching tube 32 is located on the side of the active layer away from the substrate 1, a first gate insulating layer is formed between the gate electrode 323 and the active layer, the source electrode 321 and the drain electrode 322 of the switching tube 32 are located on the side of the gate electrode 323 away from the substrate 1, a second gate insulating layer and an intermediate dielectric layer are sequentially formed between the gate electrode 323 and the source electrode 321 and the drain electrode 322, the source electrode 321 and the drain electrode 322 are electrically connected with the active layer of the switching tube 32 through a via hole, and the photosensitive device 31 is arranged on the side of the switching tube 32 away from the substrate 1, a first passivation layer, a first planarization layer and a second passivation layer can be sequentially formed between the switching tube 32 and the photosensitive device 31, the output end of the photosensitive device 31 can be electrically connected with the source electrode of the switching tube 32 through a via hole, the sensor gate line 311 can be located on the side of the photosensitive device 31 away from the substrate 1, a protective layer and a second planarization layer can be sequentially formed between the photosensitive device 31 and the sensor gate line, and the sensor gate line 311 is electrically connected with the photosensitive device 31 through a via hole.

[0032] As shown in the figure, Figure 1 A plurality of optical sensing components 3 can be distributed in an array on the display substrate, different signal quantities are generated by different light intensities of the finger ridge reaching the photosensitive device 31, and the purpose of optical fingerprint identification is achieved.

[0033] The display substrate provided by the embodiment of the present application comprises, Figure 1 and 3As shown, the display panel 1 includes a plurality of gate lines (Gate) 41 extending in a first direction, a plurality of data lines (Data) 52 extending in a second direction, and a plurality of pixel driving circuits 8 located at intersections of the plurality of gate lines 41 and the plurality of data lines 52, each of the plurality of pixel driving circuits 8 is electrically connected with the gate line 41 and the data line 52, and the plurality of pixel driving circuits 8 are electrically connected with the anodes 21 of the plurality of light emitting units 2 one by one for driving the light emitting units 2 to emit light. The specific structure of the pixel driving circuit 8 can be determined according to actual conditions, which is not limited here, for example, the pixel driving circuit 8 can be of a 5T2C, 7T1C structure, etc.

[0034] Specifically, the pixel driving circuit 8 can be composed of a plurality of thin film transistors, as shown in FIG. 2. Figure 2 As shown, the gate of the thin film transistor in the pixel driving circuit 8 can be disposed in the same layer as the gate 323 of the switch tube 32, the source and the drain of the thin film transistor can be disposed in the same layer as the source 321 and the drain 322 of the switch tube 32, the anode 21 of the light emitting unit 2 can be disposed in the same layer as the sensor gate line 311, and each light emitting unit 2 is separated by a pixel definition layer.

[0035] In a specific embodiment, as shown in FIG. 3, Figure 1 and Figure 2 As shown, the second display signal line 5 can be a first power signal line (VDD) 51 extending in the second direction, and the first power signal line 51 is used to provide a stable constant voltage signal for the pixel driving circuit 8. Since the first power signal line 51 transmits a stable constant voltage signal, the first power signal line 51 is located between the first display signal line 4 and the read signal line 6, and the first power signal line 51 can isolate the read signal line 6 from the first display signal line 4, reduce the coupling between the read signal line 6 and the first display signal line 4, and further reduce the interference strength of the read signal line 6.

[0036] In a possible embodiment, the second display signal line 5 can also be the data line 52, and the data line 52 can work with the read signal line 6 in time division to ensure that the data line 52 has a stable electrical signal when the read signal line 6 works. Specifically, the specific process of the data line 52 working in time division with the read signal line 6 can be that when the data line 52 works, the read signal line 6 does not read the fingerprint recognition electrical signal, and the data line 52 inputs an electrical signal for driving the light emitting unit 2 to emit light, and when the read signal reads the fingerprint recognition electrical signal, the data line 52 inputs a stable electrical signal to ensure that the data line 52 has a shielding protection effect on the first display signal line 4 and reduces the interference strength of the read signal line 6.

[0037] In a specific embodiment, as shown in FIG. 4, Figure 1As shown, the first display signal lines 4 can be gate lines 41, an initialization signal line (Vinit) 42, a reset signal line (Reset) 43, and a second power signal line (VDD1) 44, etc. extending in the first direction. The second power signal line 44 inputs the same stable electrical signal as the first power signal line 51, and the initialization signal line 42, the reset signal line 43, and the second power signal line 44 are electrically connected to the pixel driving circuit 8, and are used to drive the plurality of light emitting units 2 to emit light to realize picture display.

[0038] The reset signal line 43, the gate line 41, and the gate electrode 323 of the switch tube 32 can be provided in the same layer, and the initialization signal line 42 and the second power signal line 44 are located between the metal layer where the gate electrode 323 of the switch tube 32 is located and the metal layer where the switch tube 32 and the source electrode 321 and the drain electrode 322 are located, which can simplify the manufacturing process and facilitate manufacturing. The second display signal line 5 can isolate the reading signal line 6 from the gate line 41, the reset signal line 43, the initialization signal line 42, and the second power signal line 44, thereby reducing the interference strength of the reading signal line 6.

[0039] Specifically, a plurality of light emitting signal lines (EM) 7 are further provided on the display substrate, and the pixel driving circuit 8 is electrically connected to the light emitting signal line 7, which provides a driving signal for the pixel driving circuit 8.

[0040] The second display signal line 5 can be provided in the same layer as the source electrode 321 and the drain electrode 322 of the switch tube 32, which can simplify the manufacturing process and facilitate manufacturing, and can be located between the reading signal line 6 and the first display signal line 4, thereby isolating the reading signal line 6 from the first signal line and reducing the interference of the first signal line on the reading signal line 6. Specifically, as shown, Figure 2 The first power signal line 51 and the data line 52 are provided in the same layer as the source electrode 321 and the drain electrode 322 of the switch tube 32.

[0041] In a specific embodiment, as shown, Figure 2As shown, the reading signal line 6 and the photosensitive device 31 can be located on the side of the switching tube 32 away from the substrate base plate 1. In the prior art, the reading signal line 6, the first power signal line 51, the data line 52, and the source 321 and the drain 322 of the switching tube 32 are arranged in the same layer, and the gate line 41, the reset signal line 43, the initialization signal line 42, and the second power signal line 44 are arranged below the reading signal line 6, which will interfere with the reading signal line 6. In the embodiment of the present application, the reading signal line 6 is located on the side of the switching tube 32 away from the substrate base plate 1, and the first power signal line 51 or the data line 52 is located between the reading signal line 6 and the gate line 41, the reset signal line 43, the initialization signal line 42, and the second power signal line 44, so that the first power signal line 51 or the data line 52 can shield and protect the reading signal line 6, and the reading signal line 6 can be made in the same layer as the metal layer connected to the output end of the photosensitive device 31, and the reading signal line 6 is electrically connected to the drain 322 of the switching tube 32 through a via. Compared with the prior design, the display substrate can be manufactured without changing the manufacturing process flow and without additional difficulty in the embodiment of the present application.

[0042] The embodiment of the present application also provides a display panel comprising any one of the display substrates provided in the above technical solutions. Specifically, the display panel can be an organic light-emitting display panel, a quantum dot light-emitting diode display panel, or a micro light-emitting diode display panel, etc.

[0043] The embodiment of the present application also provides a display device comprising the display panel provided in the above technical solutions.

[0044] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A display substrate, characterized in that, It includes a substrate and multiple light-emitting units, multiple optical sensing components, multiple first display signal lines, multiple second display signal lines, and multiple readout signal lines located on the substrate; Multiple light-emitting units are arranged in an array on the substrate, each light-emitting unit including an anode, a light-emitting layer, and a cathode sequentially formed on the substrate; the optical sensing component includes a photosensitive device, each photosensitive device being located between two adjacent anodes; multiple first display signal lines and multiple second display signal lines are used to transmit driving electrical signals for driving the multiple light-emitting units to emit light, and multiple read signal lines are used to read fingerprint recognition electrical signals emitted by the photosensitive devices; the first display signal lines extend along a first direction, and the second display signal lines and the read signal lines extend along a second direction, the first direction intersecting the second direction; wherein... The plurality of first display signal lines, the plurality of second display signal lines, and the plurality of read signal lines are on different layers and are insulated from each other. The plurality of second display signal lines are located on the side of the first display signal lines away from the substrate, and the plurality of read signal lines are located on the side of the second display signal lines away from the first display signal lines. The orthographic projection of the plurality of second display signal lines on the substrate completely covers the orthographic projection of the plurality of read signal lines on the substrate. When the read signal lines are working, the second display signal lines have a stable electrical signal.

2. The display substrate according to claim 1, characterized in that, The optical sensing component also includes a switching transistor. A reverse bias voltage signal is input to the input terminal of the photosensitive device. The output terminal of the photosensitive device is electrically connected to the source of the switching transistor. The drain of the switching transistor is electrically connected to the read signal line. The gate of the switching transistor is electrically connected to the driving device.

3. The display substrate according to claim 2, characterized in that, It includes multiple gate lines extending along a first direction, multiple data lines extending along a second direction, and multiple pixel driving circuits located at the intersections of the multiple gate lines and the multiple data lines. Each pixel driving circuit is electrically connected to the gate lines and the data lines, and the multiple pixel driving circuits are electrically connected one-to-one to the anodes of the multiple light-emitting units to drive the light-emitting units to emit light.

4. The display substrate according to claim 3, characterized in that, The second display signal line includes a first power signal line extending along the second direction, the first power signal line being used to provide a stable constant voltage signal to the pixel driving circuit.

5. The display substrate according to claim 3, characterized in that, The second display signal line includes the data line, and the data line and the read signal line operate in a time-sharing manner.

6. The display substrate according to claim 3, characterized in that, The first display signal line includes the gate line extending along the first direction, an initialization signal line, a reset signal line, and a second power signal line.

7. The display substrate according to claim 6, characterized in that, The reset signal line, the gate line, and the gate of the switching transistor are disposed on the same layer. The initialization signal line and the second power supply signal line are located between the metal layer where the gate of the switching transistor is located and the metal layer where the switching transistor, source, and drain are located.

8. The display substrate according to any one of claims 2-7, characterized in that, The second display signal line is disposed on the same layer as the source and drain of the switching transistor.

9. The display substrate according to any one of claims 2-7, characterized in that, The read signal line and the photosensitive device are located on the side of the switching transistor away from the substrate.

10. A display panel, characterized in that, Includes the display substrate as described in any one of claims 1-9.

11. A display device, characterized in that, Includes the display panel as described in claim 10.

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