Patent ID: 12207507

DETAILED DESCRIPTION OF THE EMBODIMENTS

In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described with reference to the accompanying drawings of the embodiments of the present disclosure below. It needs to be noted that the shape and size of graphs in the accompanying drawings do not reflect true scales, and are only intended to schematically illustrate the content of the present disclosure. Numbers which are same or similar all the way indicate same or similar elements or elements with same or similar functions. Apparently, the described embodiments are only part of the embodiments of the present disclosure, not all of them. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

Unless otherwise defined, the technical terms or scientific terms used here shall have common meanings understood by those of ordinary skill in the art to which the present disclosure belongs. The terms “first”, “second” and similar words used in the specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. “Include” or “comprise” and other similar words mean that an element or item appearing before the word covers an element or item listed after the word and their equivalents, but does not exclude other elements or items. “Inner”, “Outer”, “Upper”, “Lower”, etc. are only used to indicate the relative position relationship. After an absolute position of a described object changes, the relative position relationship may also change accordingly.

In optical fingerprint recognition, a photosensor (sensor) is needed to detect optical signals reflected on a finger, and thus fingerprints are obtained to achieve fingerprint recognition. An in-cell solution and an off-screen solution may be obtained through division according to the position of the photosensor. According to the off-screen optical fingerprint recognition solution, a screen emits light, the light irradiates the finger, then an image of the finger passes through an organic light emitting display (OLED) to be collected by an optical sensor below the screen, and the fingerprint image is obtained. But when the light passes through the display screen, as many films absorb or reflect the light, the signal quantity received on the photosensor is small, and clear imaging of the photosensor is interfered. According to the in-cell optical fingerprint recognition solution, the photosensor is integrated in the display screen, the photosensor and the display screen share the same substrate, thus, the number of film structures through which the light penetrates from the finger to the photosensor may be reduced, the signal quantity is increased, as only one substrate is needed, the thickness of the screen may be effectively reduced, and the whole becomes thinner. But as the photosensor and the display device are made on the same substrate, a circuit structure is complex, and interference between different signal lines is generated.

As for the fingerprint recognition technology, it is very important to obtain clear fingerprint imaging, and high noise will cause unclear fingerprints, and also may affect imaging of the position where signal light is weak. By combining pixel circuit simulation and actual measurement results, it is positioned that a noise source to a large degree is interference between signals. As stray capacitance (RC-loading) exists between different signal lines, electric signals loaded on different signal lines may couple alternating noise on other signal lines. The alternating noise on the read signal lines (Read line) for obtaining fingerprint recognition electric signals may greatly interfere with finally-collected fingerprint recognition electric signals, and thus the fingerprint imaging area is small and imaging is unclear.

As for the above problems in related technologies, an embodiment of the present disclosure provides a display substrate, as shown inFIG.1andFIG.2, includes:abase substrate101;a plurality of read signal lines102, extending on the base substrate101in a first direction Y;a plurality of display signal lines103, extending on the base substrate101in a second direction X, wherein the second direction X intersects with the first direction Y, the plurality of display signal lines103and the plurality of read signal lines102are arranged on different layers, and an orthographic projection of the plurality of display signal lines103on the base substrate101and an orthographic projection of the plurality of read signal lines102have an overlapped region C; anda shielding layer104, located between a layer where the plurality of read signal lines102are located and a layer where the plurality of display signal lines103are located, wherein an orthographic projection of the shielding layer104on the base substrate101at least covers the overlapped region C.

In the above display substrate provided by embodiments of the present disclosure, the read signal lines102are used for reading electric signals of fingerprint recognition, the shielding layer104is arranged between the read signal lines102and the display signal lines103, the shielding layer104may effectively isolate signals on the display signal lines103so as to prevent the signals from interfering with the read signal lines102, thus, noise is reduced, the signal-to-noise ratio is increased, the large signal-to-noise ratio indicates that the ratio of useful signals in collected signals is large, the finally-collected fingerprint imaging area is large, and the definition is high. Thus, the definition of fingerprint recognition is improved while a display function is guaranteed.

Optionally, in the above display substrate provided by embodiments of the present disclosure, in order to achieve a shielding effect of the shielding layer104, a material of the shielding layer104may be copper, molybdenum, aluminum and other metal materials with shielding properties or indium tin oxide and other transparent conductive materials. During specific implementation, the shielding layer104may be arranged in a suspended mode (not load signals) or may be arranged to load direct signals. Optionally, the direct current signals may be high-level (VDD) signals, low-level (VSS) signals, initialization (Vin) signals, bias voltage (Vbias) signals and the like. In order to guarantee a good shielding effect, the shielding layer104loads the direct current signals preferably. The specific reason is as follows: alternating noise on the read signal lines102in the related technologies is introduced through stray capacitance, after the shielding layer104is added, shake (namely, alternating noise) brought by the stray capacitance is firstly introduced to the shielding layer104, meanwhile, fixed potential is added to the shielding layer104to guarantee charge change output caused by the shake, voltages on the shielding layer104are stabilized, influences on the shielding layer104are reduced, and thus it is guaranteed that flow of charge in the read signal lines102is not affected by the shielding layer104.

In some embodiments, a first pixel driving circuit of the photosensor and a second pixel driving circuit of a light-emitting device are simultaneously formed on the base substrate101, under this condition, same films in the first pixel driving circuit and the second pixel driving circuit will be shared, display and collection may not be separated, and thus key routes-read signal lines102which are easily interfered and greatly affect output of the fingerprint recognition electric signals may be subjected to electromagnetic shielding one by one.

Based on this, in the above display substrate provided by embodiments of the present disclosure, as shown inFIG.1andFIG.3, the shielding layer104may include a plurality of mutually-independent shielding portions (one shielding portion is specifically shown inFIG.1andFIG.3), and an orthographic projection of each shielding portion on the base substrate101correspondingly and completely covers an orthographic projection of one read signal line102.

It shall be understood that in order to conform to a light and thin development trend, the shielding layer104in the present disclosure does not need to be thick as long as the shielding layer104may achieve the effect of shielding display signal interference, and during specific implementation, under the condition of clear actual fingerprint imaging, a thickness of the shielding layer104is as small as possible. As a line width of the shielding portions with a small thickness is large compared with a line width of the read signal lines102, a product appearance observed through human eyes may not be affected.

Optionally, in the above display substrate provided by embodiment of the present disclosure, as shown inFIG.1andFIG.4, the plurality of display signal lines103may include a plurality of first display signal lines1031located between the base substrate101and the layer where the plurality of read signal lines102are located, and a plurality of second display signal lines1032located on one side of the layer where the plurality of read signal lines102are located facing away from the base substrate101; the shielding portions may include first sub-portions1041and/or second sub-portions1042; wherein the first sub-portions1041are located between a layer where the plurality of first display signal lines1031are located and the layer where the plurality of read signal lines102are located, and the second sub-portions1042are located between a layer where the plurality of second display signal lines1032are located and the plurality of read signal lines102. Thus, interference of the first display signal lines1031and interference of the second display signal lines1032may be shielded by the first sub-portions1041and the second sub-portions1042located on upper sides and lower sides of the plurality of read signal lines102respectively.

Optionally, in the above display substrate provided by embodiments of the present disclosure, as shown inFIG.1andFIG.4, the shielding portions include the first sub-portions1041and the second sub-portions1042; wherein the first sub-portions1041and the second sub-portions1042are electrically connected, and an orthographic projection of the second sub-portions1042on the base substrate101is located in an orthographic projection of the first sub-portions1041.

Due to the arrangement, the first sub-portions1041and the second sub-portions1042surround the read signal lines102, interference of the first display signal lines1031and interference of the second display signal lines1032on the upper sides and the lower sides of the read signal lines102may be effectively shielded, as the first sub-portions1041are wider than the second sub-portions1042, a position, right opposite to the display signal lines103, of the shielding layer104does not have a notch, interference of the display signal lines103may be prevented from coming in from the notch, and the signal-to-noise ratio is further increased.

Optionally, the above display substrate provided by embodiments of the present disclosure, as shown inFIG.1andFIG.4, further may include: a first insulating layer105located between a layer where the first sub-portions1041are located and the layer where the plurality of read signal lines102are located, and a second insulating layer106located between a layer where the second sub-portions1042are located and the layer where the plurality of read signal lines102are located; and the first sub-portions1041and the second sub-portions1042specifically may be electrically connected through at least one through hole H penetrating through the first insulating layer105and the second insulating layer106.

During specific implementation, the first sub-portions1041and the first insulating layer105may be manufactured in sequence before the plurality of read signal lines102are manufactured; and the second insulating layer106, the through holes H penetrating through the first insulating layer105and the second insulating layer106and the second sub-portions1042are manufactured in sequence after the plurality of read signal lines102are manufactured, and thus the second sub-portions1042and the first sub-portions1041are electrically connected.

Optionally, in the above display substrate provided by embodiments of the present disclosure, as shown inFIG.1andFIG.3, there are many through holes H, and all the through holes H are formed in edges of two sides of the reading signal lines102respectively. Specifically, the base substrate101includes a display region AA, and a bezel region BB located around the display region AA; and all the through holes H may be at least formed in the bezel region BB. The through holes H are only formed in the bezel region BB, the number of the through holes H may be remarkably reduced, and it is guaranteed that a larger space exists for displayed and collected pixel circuit routing.

Optionally, in the above display substrate provided by embodiments of the present disclosure, as shown inFIG.1, all the through holes H may be formed in the display region AA and the bezel region BB; wherein the through holes H in the display region AA are located in two sides of the overlapped region C; and a length of the through holes H in the display region AA is equal to a length of the overlapped region C in the first direction X. Thus, it may be guaranteed that the position, right opposite to the display signal lines103, of the shielding layer104does not have the notch, interference of the display signal lines103may be prevented from entering from the notch, and the signal-to-noise ratio is effectively increased.

Optionally, the first display signal lines1031may include gate lines1031a, initialization signal lines, reset signal lines1031band high-level power lines, and the second display signal lines1032may include anode routes; wherein the gate lines1031aand the initialization signal lines are arranged on the same layer, and the reset signal lines1031band the high-level power lines are arranged on the same layer; and a layer where the reset signal lines1031bare located is located between the layer where the gate lines1031aare located and the layer where the plurality of read signal lines102are located. In some embodiments, the gate lines1031aand the initialization signal lines arranged on the same layer may be located on a layer where a gate1083of a transistor is located, the reset signal lines1031band the high-level power lines arranged on the same layer may be located between the layer where the gate1083of the transistor is located and a layer where a source1081is located, and the anode routes and an anode109may be arranged on the same layer.

Optionally, the above display substrate provided by embodiments of the present disclosure, as shown inFIG.1andFIG.4, further may include the photosensor107located on one side of the layer where the plurality of read signal lines102are located facing away from the base substrate101, and the transistor108located between the base substrate101and the layer where the plurality of read signal lines102are located; the transistor108includes the gate1083arranged on the same layer with the gate lines1031a, and the source1081and a drain1082located on one side of the gate1083facing away from the base substrate101; and the plurality of read signal lines102, the source1081and the drain1082may be arranged on the same layer, the first sub-portions1041may be located between the layer where the reset signal lines1031bare located and the layer where the source1081and the drain1082are located, and the second sub-portions1042may be located between the layer where the source1081and the drain1082are located and a layer where the photosensor107is located. As the read signal lines102, the source1081and the drain1082share the same layer, the number of layers of needed masks is reduced, the process difficulty is reduced, and the cost is reduced.

In consideration of the situation that routes of pixel driving circuits in some products are intensive, the first sub-portions1041and the read signal lines102may be independently arranged, as shown inFIG.5, the read signal lines102specifically may be arranged between the layer where the transistor108is located and the layer where the photosensor107is located, the first sub-portions1041are arranged between the layer where the transistor108is located and the layer where the read signal lines102are located, and the second sub-portions1042and a first electrode1071of the photosensor107may be arranged on the same layer. As the second sub-portions1042and the first electrode1071share the same layer, the number of layers of the needed masks is reduced, the process difficulty is reduced, and the cost is reduced.

Optionally, the photosensor107in the present disclosure may include the first electrode1071, a photoelectric conversion layer1072and a second electrode1073sequentially arranged on one side of the layer where the plurality of read signal lines102are located facing away from the base substrate101in a stacked mode; wherein the photoelectric conversion layer1072may be of a PIN structure, and specifically includes a P type semiconductor layer, an intrinsic semiconductor layer and an N type semiconductor layer arranged in a stacked mode. Specifically, bias signals may be provided for the second electrode1073of the photosensor107through bias signal lines110. The transistor108may be an amorphous-silicone thin-film transistor, a low-temperature polycrystalline silicone transistor or an oxide transistor, and may be a bottom gate type transistor or a top gate type transistor.FIG.2specifically shows the transistor108being the top gate type transistor, wherein an active layer1084is located below the gate1083.

In some embodiments, a first pixel driving circuit of the photosensor is formed on the base substrate101, a second pixel driving circuit of the light-emitting device is formed on one side of the photosensor facing away from the base substrate101, under this condition, display and collection are distributed on different films, and thus it may be considered that the whole-face shielding layer104is added to enable display and collection to be free of interference.

Based on this, the above display substrate provided by embodiments of the present disclosure, as shown inFIG.6, further may include: the photosensor107located on one side of the layer where the plurality of read signal lines102are located facing away from the base substrate101;the plurality of display signal lines103are located on one side of a layer where the photosensor107is located facing away from the base substrate101; andthe shielding layer104is arranged between the layer where the photosensor107is located and the layer where the plurality of display signal lines103are located on the whole face.

In addition, under the condition that the first pixel driving circuit of the photosensor107and the second pixel driving circuit of the light-emitting device are simultaneously arranged on the base substrate101, as shown inFIG.2,FIG.4andFIG.5, the display substrate provided by the present disclosure further may include: the bias signal lines110arranged on the same layer with the anode109, a buffer layer111, a first gate insulating layer112, a second gate insulating layer113, a first inter-layer dielectric layer114, a first insulating layer115, a second insulating layer116, a third insulating layer117, an adapter electrode118arranged on the same layer with the first electrode, a side wall protection layer119, a first flat layer120, a protection layer121multiplexed as a pixel defining layer, a light-emitting functional layer, a cathode, a packaging layer and the like, wherein and the light-emitting functional layer, the cathode and the packaging layer are not shown in the Figure and located on one side of the pixel defining layer facing away from the base substrate101.

When the first pixel driving circuit of the photosensor107is arranged on the base substrate101, and the second pixel driving circuit of the light-emitting device is arranged on one side of the photosensor107facing away from the base substrate101, as shown inFIG.6, the display substrate provided by the present disclosure further may include: the anode109, the bias signal lines110, the buffer layer111, the first gate insulating layer112, the second gate insulating layer113, the first inter-layer dielectric layer114, the first insulating layer115, the second insulating layer116, the side wall protection layer119, the first flat layer120, the protection layer121, a second flat layer122, a third gate insulating layer123, a fourth gate insulating layer124, a second inter-layer dielectric layer125, a fourth insulating layer126, a fifth insulating layer127, a sixth insulating layer128, a seventh insulating layer129, an eighth insulating layer130, the adapter electrode118, a third flat layer131, a pixel defining layer132, a light-emitting functional layer, a cathode, a packaging layer and the like, wherein the light-emitting functional layer, the cathode and the packaging layer are not shown in the Figure and located on one side of the pixel defining layer132facing away from the base substrate101.

Based on the same inventive concept, an embodiment of the present disclosure provides a display panel including the above display substrate provided by the embodiment of the present disclosure. As the principle for solving problems of the display panel is similar to the principle for solving problems of the display substrate, implementation of the display panel provided by the embodiment of the present disclosure may refer to implementation of the display substrate provided by the embodiment of the present disclosure, and repetitions are omitted here.

Optionally, the display panel may include: a plurality of pixel units arranged in the display region in an array, and each pixel unit may include a plurality of sub-pixels. Exemplarily, each pixel unit may include a read sub-pixel, a green sub-pixel and a blue sub-pixel, and thus color display may be achieved through mixing of red, green and blue. Alternatively, each pixel unit also may include a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel, and thus color display may be achieved through mixing of red, green, blue and white. Of course, in actual application, light-emitting colors of the sub-pixels of each pixel unit may be designed and determined according to actual application environments, which is not limited herein.

Optionally, the display panel may be an organic light-emitting display panel, a quantum dot light-emitting diode or a micro-light-emitting diode display panel and other electroluminescent display panels. At this moment, the sub-pixels may include electroluminescent diodes and driving circuits for driving the electroluminescent diodes to emit light. The electroluminescent diodes include anodes, light-emitting layers and cathodes; and the driving circuits may include driving transistors, switching transistors and storage capacitors, and the specific structure and the working principle of the driving circuits may be the same as those in the prior art, which is not repeated here.

Based on the same inventive concept, an embodiment of the present disclosure further provides a display apparatus including the display panel provided by the embodiment of the present disclosure. The display apparatus may be a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a smart watch, a fitness wristband, a personal digital assistant and other any products or components with display functions. Other essential components of the display apparatus shall be understood by those of ordinary skill in the art, which is omitted here, and do not limit the present disclosure. In addition, as the principle of solving problems of the display apparatus is similar to the principle of solving problems of the display panel, implementation of the display apparatus may refer to the embodiment of the display panel, and repetitions are omitted here.

Some embodiments of the present disclosure provide the display substrate, the display panel and the display apparatus. The display substrate includes the base substrate; the plurality of read signal lines, extending on the base substrate in the first direction; the plurality of display signal lines, extending on the base substrate in the second direction, wherein the second direction intersects with the first direction, the plurality of display signal lines and the plurality of read signal lines are arranged on different layers, and the orthographic projection of the plurality of display signal lines on the base substrate and the orthographic projection of the plurality of read signal lines have the overlapped region; and the shielding layer, located between the layer where the plurality of read signal lines are located and the layer where the plurality of display signal lines are located, wherein the orthographic projection of the shielding layer on the base substrate at least covers the overlapped region. In the present disclosure, the read signal lines are used for reading electric signals of fingerprint recognition, the shielding layer is arranged between the read signal lines and the display signal lines, the shielding layer can effectively isolate signals on the display signal lines so as to prevent the signals from interfering with the read signal lines, and thus the definition of fingerprint recognition is improved while the display function is guaranteed.

Apparently, those skilled in the art can perform various changes and modifications on the present disclosure without departing from the spirit and scope of the present disclosure. Therefore, if these changes and modifications on the present disclosure fall in the scope of the claims of the present disclosure and their equivalent technologies, the present disclosure is also intended to contain these changes and modifications.