Patent ID: 12217534

DETAILED DESCRIPTION

Specific implementations of the present disclosure will be described in further detail below with reference to the accompanying drawings and embodiments. The following embodiments serve to illustrate the present disclosure, but are not intended to limit the scope of the present disclosure. It should be noted that embodiments in the present disclosure and features in the embodiments may be combined with each other arbitrarily if there is no conflict.

An embodiment of the present disclosure provides a display panel, which includes a sensor area, for example, the sensor area are provided with one fingerprint identification sensor or a plurality of fingerprint identification sensors, a first light shield layer disposed on the fingerprint identification sensor and a color film layer disposed on the first light shield layer, wherein the color film layer includes color filters with different colors and a light transmission part disposed between the color filters with different colors. The first light shield layer includes a first opening and a light shield part, wherein the light transmission part and the first opening are used for allowing fingerprint reflected light to transmit and reach the fingerprint identification sensor, and the light shield part is used for blocking out stray light. The stray light in the embodiments of the present disclosure includes stray light reflected by a touch electrode in a touch structure layer from light emitted by an organic light emitting layer.

According to the display panel provided in the embodiment of the present disclosure, stray light is blocked out by the light shield part, and fingerprint reflected light is allowed to transmit and reach the fingerprint identification sensor through the light transmission parts and the first openings, so that light may pass through the screen for performing fingerprint identification without increasing power consumption, thus the display panel has simple manufacturing process and high production efficiency, with advantages such as low production cost and high yield, and has a great application prospect.

The display panel of the embodiment of the present disclosure may be implemented by various solutions. The following will be described in detail by embodiments.

In an embodiment of the present disclosure,FIGS.1to5are schematic diagrams of five structures of a display panel according to an embodiment of the present disclosure. A main structure of the display panel of the present embodiment includes multiple pixel units disposed in a matrix, wherein each pixel unit includes multiple sub-pixels. For example, each pixel unit may include three sub-pixels, namely a red sub-pixel R, a green sub-pixel G and a blue sub-pixel B. In the present embodiment, a second opening K2is disposed on a first black matrix30between color filters31with different colors, and a fingerprint in contact with the display panel is pin-hole imaged onto a fingerprint identification sensor35through the second opening K2. Pin-hole imaging is a physical phenomenon. When a plate with a pin hole is used to shield between a wall and an object, an inverted image of the object will be formed on the wall, and such phenomenon is called pin-hole imaging.

As shown inFIGS.1to5, the display panel of the present embodiment includes a base substrate10and multiple pixel units disposed in a matrix on the base substrate10, wherein each pixel unit includes multiple sub-pixels, and each sub-pixel includes a drive structure layer401, a first planarization layer19, a first electrode20, a pixel define layer21, a spacer layer22, an organic light emitting layer23, a second electrode24and an encapsulation layer25.

Herein, the drive structure layer401is disposed on the base substrate10, and the drive structure layer401in each sub-pixel includes a first thin film transistor. The first planarization layer19is disposed on the drive structure layer401. The first electrode20is disposed on the first planarization layer19and connected to the first thin film transistor in the drive structure layer401through a via hole provided on the first planarization layer19. The pixel define layer21disposed on the first planarization layer19includes multiple pixel openings and retaining walls around the pixel openings, wherein the pixel openings expose the first electrode20. The spacer layer22is disposed on the pixel define layer21. The organic light emitting layer23is disposed on the first electrode20. The second electrode24is disposed on the organic light emitting layer23. The encapsulation layer25is disposed on the second electrode24and covers the entire base substrate10. The color film layer is disposed above the encapsulation layer25.

As shown inFIG.1toFIG.5, the color film layer of the present embodiment includes color filters31with different colors and a first black matrix30disposed between the color filters31with different colors. The first black matrix30is provided with the second opening K2, there is an overlapping area between an orthographic projection of the second openings K2on the base substrate10and an orthographic projection of the fingerprint identification sensor35on the base substrate10, and the second opening K2pin-hole images a fingerprint in contact with the display panel onto the fingerprint identification sensor35, and the second openings K2form a light transmission part LTP.

As shown inFIGS.1to5, the display panel of the present embodiment further includes a cover plate34. In an exemplary embodiment, a distance between the cover plate34and the second opening K2in a direction perpendicular to the display panel is greater than a distance between the second opening K2and the fingerprint identification sensor35in the direction perpendicular to the display panel. Since a distance between the second opening K2and an outermost side of a screen is an object distance, and the distance between the second opening K2and the fingerprint identification sensor35is an image distance, the imaging area may be increased and the density and number of pinhole arrays may be reduced when the object distance is greater than the image distance.

In an exemplary embodiment, in order to increase the distance between the cover plate34and the second openings K2in the direction perpendicular to the display panel, the cover plate34may be made into a multilayer structure. For example, the cover plate34may be made into a double-layer structure.

In an exemplary embodiment, a shape of the first openings K1and/or the second openings K2may be square, circle, polygonal, etc.

In an exemplary embodiment, an aperture of the first opening K1and/or the second opening K2may be 3 to 30 microns.

In an exemplary embodiment, an aperture of the second opening K2is smaller than or equal to an aperture of the first opening K1to avoid a decrease of the imaging area.

As shown inFIG.1toFIG.5, the display panel of the present embodiment further includes a touch structure layer402, wherein the touch structure layer402is disposed between the encapsulation layer25and the color film layer. The touch structure layer402includes multiple touch electrodes (MT inFIGS.1to5is an abbreviation of Metal, while in the present disclosure, MT stands for a touch electrode), and an orthographic projection of the first black matrix30on the base substrate10includes an orthographic projection of the touch electrode on the base substrate10.

In an exemplary embodiment, as shown inFIG.1, a material of the retaining wall is an organic light shield material, and the retaining wall is provided with the first opening K1, and the retaining wall forms the light shield part (LSP). A material of the first planarization layer19inFIG.1is an organic light-transmitting material.

In another exemplary embodiment, as shown inFIG.2, the material of the first planarization layer19is an organic light shield material, and the first planarization layer19provided with the first opening K1forms the light shield part (LSP). A material of the retaining wall inFIG.2is an organic light-transmitting material.

In another exemplary embodiment, as shown inFIG.3, the drive structure layer401includes a buffer layer11, an active layer12, a first gate insulating layer13, a first gate electrode layer14, a second gate insulating layer15, a second gate electrode layer16, a first interlayer insulating layer17, a first source-drain metal layer18, a second interlayer insulating layer38and a second source-drain metal layer39which are sequentially stacked on the base substrate10, wherein the second source-drain metal layer39is provided with the first opening K1and the second source-drain metal layer39forms the first light shield layer.

In another exemplary embodiment, as shown inFIG.4, the drive structure layer401includes the buffer layer11, the active layer12, the first gate insulating layer13, the first gate electrode layer14, a second gate insulating layer15, the second gate electrode layer16, the first interlayer insulating layer17and a first source drain metal layer18which are sequentially stacked on a base substrate10, and a light shield layer40disposed between the base substrate10and the buffer layer11forms the first light shield layer.

In another exemplary embodiment, as shown inFIG.5, the base substrate10includes a first base substrate101and a second base substrate102, and the light shield layer40disposed between the first base substrate101and the second base substrate102forms the first light shield layer.

In the present embodiment, the first light shield layers inFIGS.3to5are all made of a metal material.

In an exemplary embodiment, as shown inFIGS.1to5, a base film2is provided on a surface of the base substrate10away from the drive structure layer401, and the fingerprint identification sensor35is attached to a surface of the side of the base film2away from the base substrate10.

In an exemplary embodiment, the fingerprint identification sensor35may be a Charge Coupled Device (CCD) image sensor, a Complementary Metal Oxide Semiconductor (CMOS) image sensor, or a Positive Intrinsic Negative (PIN)-type photoelectric sensor manufactured by an amorphous silicon process.

The technical solution of the present embodiment is further described below through a manufacturing process of the display panel in the present embodiment. A “patterning process” mentioned in the embodiment includes processing such as film layer deposition, photoresist coating, mask exposure, development, etching, and photoresist stripping, etc. A “photolithography process” in the present embodiment includes processing such as film layer coating, mask exposure and development, etc. The deposition may be selected as any one or more of sputtering, evaporation and chemical vapor deposition, the coating may be selected as any one or more of spraying and spin coating, and the etching may be selected as any one or more of dry etching and wet etching. A “thin film” refers to a layer of thin film manufactured from a certain material on a base substrate by using a deposition or coating process. If the “thin film” does not need a patterning process during the entire manufacturing process, the “thin film” may also be called a “layer”. When the “thin film” needs a patterning process during the entire manufacturing process, it is called a “thin film” before the patterning process and called a “layer” after the patterning process. The “layer” after the patterning process includes at least one “pattern”. In the present disclosure, “A and B are disposed on the same layer” means that A and B are formed at the same time by the same patterning process. “An orthographic projection of A includes an orthographic projection of B” means that the orthographic projection of B falls within a range of the orthographic projection of A, or the orthographic projection of A covers the orthographic projection of B.

A flexible base substrate10is manufactured on a glass carrier plate1. In the present disclosure, a material of the flexible base substrate10may be polyimide (PI), polyethylene terephthalate (PET) or a surface-treated polymer soft film, etc., which is as shown inFIG.6.

A pattern of a drive structure layer401is manufactured on the flexible base substrate10. The drive structure layer401includes multiple gate lines and multiple data lines, and the multiple gate lines and the multiple data lines vertically intersect with each other to define multiple pixel units disposed in a matrix, each pixel unit includes at least three sub-pixels, and each sub-pixel includes at least one first Thin Film Transistor (TFT). The first thin film transistor may have a bottom gate structure or a top gate structure, or may be an amorphous silicon (a-Si) thin film transistor, a low temperature polysilicon (LTPS) thin film transistor or an oxide thin film transistor, which is not specifically limited here. In the present embodiment, one pixel unit includes three sub-pixels, namely red sub-pixel R, green sub-pixel G and blue sub-pixel B. Indeed, the present embodiment is also applicable to a case where one pixel unit includes four sub-pixels (red sub-pixel R, green sub-pixel G, blue sub-pixel B and white sub-pixel W). In an exemplary embodiment, the manufacturing process of the drive structure layer401may include:

A first insulating thin film and an active layer thin film are sequentially deposited on the flexible base substrate10, the active layer thin film is patterned by a patterning process to form a first insulating layer11covering the entire flexible base substrate10and a pattern of an active layer12disposed on the first insulating layer11. In an exemplary embodiment, the first insulating layer11is called a buffer layer, which is used for improving the water and oxygen resistance of the base substrate.

Then, a second insulating thin film and a first metal thin film are sequentially deposited, and the first metal thin film is patterned by a patterning process to form a second insulating layer13covering a pattern of the active layer pattern12and to form a pattern of a first gate electrode layer14disposed on the second insulating layer13, wherein the first gate electrode layer14at least includes a first gate electrode (GT) a first capacitor electrode (GT1), multiple gate lines (not shown) and multiple gate leads (not shown). In an exemplary embodiment, the second insulating layer13is called a first gate insulating layer (GI1).

Then, a third insulating thin film and a second metal thin film are sequentially deposited, and the second metal thin film is patterned by a patterning process to form a third insulating layer15covering the first gate electrode layer14and to form a pattern of a second gate electrode layer16disposed on the third insulating layer15, wherein the second gate electrode layer16includes at least a second capacitor electrode (GT2) and a second leads (not shown), wherein a position of the second capacitor electrode (GT2) corresponds to that of the first capacitor electrode (GT1). In an exemplary embodiment, the third insulating layer15is also called a second gate insulating layer (GI2).

Then, a fourth insulating thin film is deposited and patterned by a patterning process to form a pattern of a fourth insulating layer17covering the second gate electrode layer16, wherein the fourth insulating layer17is provided thereon with multiple first via holes, and positions of the multiple first via holes correspond to that of both ends of a first active layer. The fourth insulating layer17, the third insulating layer15and the second insulating layer13in the multiple first via holes are etched off to respectively expose a surface of the first active layer. In an exemplary embodiment, the fourth insulating layer17is also called a first interlayer insulating layer (ILD).

Then, a third metal thin film is deposited and patterned by the patterning process to form a pattern of a source-drain metal layer18on the fourth insulating layer17, and the source-drain metal layer18at least includes a first source electrode S, a first drain electrode D, low voltage line (VSS, not shown), pattern of multiple data lines (not shown), and pattern of multiple data leads (not shown), wherein the first source electrode S and the first drain electrode D are connected to the active layer12respectively through the first via holes. In an exemplary embodiment, according to actual needs, the source-drain metal layer18may also include any one or more of a power supply line (VDD), a compensation line and an auxiliary second electrode, and the source-drain metal layer18is also called a first source-drain metal layer (SD1).

At this point, the pattern of the drive structure layer401is manufactured on the flexible base substrate10, as shown inFIG.7. The active layer12, the first gate electrode GT, the first source electrode S and the first drain electrode D form the first thin film transistor, the first capacitor electrode GT1and the second capacitor electrode GT2constitute a first storage capacitor, and multiple gate leads and data leads form drive leads of gate driver on array (GOA).

A first planarization thin film is coated on the flexible base substrate where the above patterns are formed to form a first planarization (PLN) layer19covering the entire flexible base substrate10, a second via hole is formed on the first planarization layer19through a patterning process, wherein the first planarization layer19in the second via hole is etched off to expose a surface of the first drain electrode of the first thin film transistor, as shown inFIG.8.

A transparent conductive thin film is deposited on the base substrate where the above patterns are formed, and the transparent conductive thin film is patterned through a patterning process to form a pattern of a first electrode20, wherein the first electrode20is connected to the first drain electrode D through the second via hole. Forming the pattern of the first electrode20includes depositing a fourth metal thin film on the base substrate where the above patterns are formed, coating a layer of photoresist on the fourth metal thin film, exposing the photoresist with a single tone mask, forming an unexposed area at the position of the first electrode20, forming fully exposed areas at other positions, developing and removing the photoresist in the fully exposed areas, etching off the fourth metal film in the fully exposed areas, and stripping off the photoresist to form the pattern of the first electrode20, as shown inFIG.9. Since the display panel of the present embodiment has a top emission structure, the first electrode20is a reflective electrode, and metals with high reflectivity, such as silver Ag, gold Au, palladium Pd, platinum Pt, etc., or alloys of these metals, or composite layers of these metals may be used. In practice, a composite layer structure of indium tin oxide (ITO) layer and metal reflective layer may also be used, which has good conductivity, high reflectivity and good morphological stability.

A pixel define thin film is coated on the base substrate where the above patterns are formed, and a pattern of a pixel define layer (PDL)21is formed through masking, exposure and development processes, wherein the pixel define layer21is provided thereon with pixel openings, and the pixel define thin film in the pixel openings is developed away to expose a surface of the first electrode20. The pixel define layer21is provided with a first opening K1, and the pixel define thin film in the first opening K1is developed to expose a surface of the first planarization layer19, as shown inFIG.10.

An organic material thin film is coated on the base substrate where the above patterns are formed, and a pattern of a spacer (PS) layer22is formed through masking, exposure and development processes, wherein the spacer layer22is disposed at the position of the first opening K1, as shown inFIG.11.

An organic light emitting layer23and a second electrode24are sequentially formed on the base substrate where the above patterns are formed, as shown inFIG.12. The organic light emitting layer23includes a hole injection layer, a hole transmission layer, a light emitting layer, an electron transmission layer and an electron injection layer which are stacked, and is formed in the pixel opening to achieve a connection between the organic light emitting layer23and the first electrode20. Since the first electrode20is connected to a first drain electrode D of the first transistor, light emission control of the organic light emitting layer23is achieved. The second electrode24is connected to the organic light emitting layer23.

A pattern of an encapsulation layer25is formed on the base substrate where the above patterns are formed, as shown inFIG.13, the encapsulation layer25may adopt a laminated structure of inorganic material/organic material/inorganic material, wherein the organic material layer is disposed between two inorganic material layers.

A pattern of a touch structure layer402is formed on the base substrate where the above patterns are formed, and the touch structure layer402includes a first touch electrode layer26, a fifth insulating layer27, a second touch electrode layer28and a sixth insulating layer29stacked on the encapsulation layer25, as shown inFIG.14.

A pattern of a color film layer is formed on the base substrate where the above patterns are formed, wherein the color film layer is disposed on the sixth insulating layer29and includes a first black matrix30and a color filter31disposed on a same layer, as shown inFIG.15. Forming the pattern of the color filter layer includes: firstly, coating a polymer photoresist layer mixed with black matrix material on the sixth insulating layer29to form a pattern of the first black matrix30through exposure and development; then, coating a polymer photoresist layer mixed with red pigment on the sixth insulating layer29to form a pattern of a red area through exposure and development; sequentially forming a pattern of a green area and a pattern of a blue area using the same methods and steps; and finally, forming color filters31with red, green and blue which are arranged according to a certain rule. The second opening K2is disposed on the first black matrix30between the color filters31with different colors, and the second opening K2exposes a surface of the sixth insulating layer29.

A thin film encapsulation process is performed on the base substrate where the above patterns are formed to form a pattern of a coating protective layer32, an optical adhesive33is coated on the base substrate where the pattern of the coating protective layer32is formed, and a cover plate34is attached to the optical adhesive33, as shown inFIG.16.

After the above film structure is manufactured, a display substrate is peeled off from a glass carrier plate1by peeling process, and then a base film2is attached to the back of the display substrate (a surface of the flexible base substrate10away from the film layer) by roller bonding, and a fingerprint identification sensor35is attached to a surface of the base film2away from the flexible base substrate10, the fingerprint identification sensor35is attached to the surface of the base film2on the side away from the flexible base substrate10through a foam layer36and the fingerprint identification sensor35is connected to a flexible printed circuit (FPC)37, as shown inFIG.1.

Through the above process, the manufacturing of the display panel shown inFIG.1in the present embodiment can be completed. It may be seen from the above manufacturing process that the display panel according to the present embodiment blocks out stray light through the light shield part LSP, and allows fingerprint reflected light to transmit and reach the fingerprint identification sensor35through the light transmission part LTP and the first opening K1, so that light can pass through the screen for fingerprint identification without increasing power consumption. The manufacturing process is simple and the production efficiency is high with the advantages of low production cost, high yield, etc., which has a great application prospect.

In an embodiment of the present disclosure, the first light shield layer includes a plurality of first openings and each of the plurality of first openings is the first opening described above, and the first openings are arranged at intervals, and a distance between two adjacent first openings ranges from 20 μm to 800 μm.

In an embodiment of the present disclosure, a distance between an edge of the orthographic projection of the touch electrodes and an edge of the orthographic projection of the first opening on the base substrate is between 0 μm and 20 μm.

Although the display panel of the present embodiment is described with a top emission structure, the solution of the present embodiment is applicable to a bottom emission structure or a double-sided emission structure, and is also applicable to large-sized or small-sized display panels. As shown inFIG.1, the display panel manufactured by the above manufacturing process includes:a base substrate10;a drive structure layer401disposed on the base substrate10, wherein the drive structure layer401in each sub-pixel includes a first thin film transistor;a first planarization layer19disposed on the drive structure layer401;a light emitting structure layer disposed on the first planarization layer19, the light emitting structure layer in each sub-pixel includes a first electrode20, a pixel define layer21, a spacer layer22, an organic light emitting layer23and a second electrode24, wherein the first electrode20is disposed on the first planarization layer19and connected to the first thin film transistor in the drive structure layer401through a via hole provided on the first planarization layer19, and the pixel define layer21is disposed on the first planarization layer19and includes multiple pixel openings and retaining walls around the pixel openings, wherein the pixel openings expose the first electrode20, a material of the retaining walls is an organic light shield material, and first openings K1are provided on the retaining walls; the spacer layer22is disposed on the pixel define layer21; the organic light emitting layer23is disposed on the first electrode20; the second electrode24is disposed on the organic light emitting layer23;an encapsulation layer25disposed on the second electrode24and covering the entire base substrate10;a touch structure layer402including a first touch electrode layer26, a fifth insulating layer27, a second touch electrode layer28and a sixth insulating layer29which are stacked on the encapsulation layer25;a color film layer disposed on the sixth insulating layer29, including a black matrix30and color filters31disposed on a same layer, wherein the second opening K2is disposed on the black matrix30between the color filters31with different colors, and the second opening K2expose a surface of the sixth insulating layer29;a coating protective layer32disposed on the color film layer for protecting the color film layer;a cover plate34attached to the coating protective layer32by an optical adhesive33;a base film2disposed on a surface of the base substrate10away from the drive structure layer401; andthe fingerprint identification sensor35attached to a surface of the base film2away from the base substrate10.

In an embodiment of the present disclosure, there is no overlapping between an orthographic projection of the touch electrodes on the base substrate and an orthographic projection of the first opening on the base substrate; and there is no overlapping between the orthographic projection of the touch electrodes on the base substrate and an orthographic projection of the second opening on the base substrate.

In an embodiment of the present disclosure, a distance between the cover plate and the second opening in a direction perpendicular to the display panel is greater than a distance between the second opening and the sensor area in the direction perpendicular to the display panel; an aperture of the second opening is smaller than or equal to an aperture of the first opening.

The manufacturing process of the display panel shown inFIG.2toFIG.5is similar to this, and thus the repeated contents will not be described in the present disclosure.

In another embodiment of the present disclosure, the present embodiment is an extension of the aforementioned embodiments. In the aforementioned embodiments, the touch structure layer402inFIGS.1to5is disposed between the encapsulation layer25and the color film layers, and in the present embodiment, the touch structure layer402is disposed above the color film layers. As shown inFIG.17, the display panel provided in the present embodiment includes multiple pixel units disposed in a matrix, and each pixel unit includes multiple sub-pixels, for example, each pixel unit may include three sub-pixels, namely red sub-pixel R, green sub-pixel G and blue sub-pixel B. In the present embodiment, the display panel is provided with a second black matrix layer on the touch structure layer402, wherein the second black matrix layer includes multiple second black matrices41with third openings K3. An orthographic projection of the second black matrices41on the base substrate10covers an orthographic projection of touch electrodes on the base substrate10, and the stray light caused by the reflection of the touch electrodes is eliminated by the second black matrices41.

As shown inFIG.17, the display panel of the present embodiment includes the base substrate10and multiple pixel units disposed in a matrix on the base substrate10. Each pixel unit includes multiple sub-pixels, and each sub-pixel includes a drive structure layer401, a first planarization layer19, a first electrode20, a pixel define layer21, a spacer layer22, an organic light emitting layer23, a second electrode24, an encapsulation layer25, a color film layer and a coating protective layer32.

Herein, the drive structure layer401is disposed on the base substrate10and the drive structure layer401in each sub-pixel includes a first thin film transistor. The first planarization layer19is disposed on the drive structure layer401. The first electrode20is disposed on the first planarization layer19and connected to the first thin film transistor in the drive structure layer401through a via hole provided on the first planarization layer19. The pixel define layer21is disposed on the first planarization layer19and includes multiple pixel openings and retaining wall around the pixel openings, wherein the pixel openings expose the first electrodes20. The spacer layer22is disposed on the pixel define layer21. The organic light emitting layer23is disposed on the first electrode20. The second electrode24is disposed on the organic light emitting layer23; the encapsulation layer25is disposed on the second electrode24and covers the entire base substrate10. The color film layer is disposed on the encapsulation layer25. The coating protective layer32is disposed on the color film layer.

As shown inFIG.17, the display panel of the present embodiment further includes a touch structure layer402and the second black matrix layer sequentially stacked on the coating protective layer32, among them:the touch structure layer402includes multiple touch electrodes;the second black matrix layer includes multiple second black matrices41provided with third openings K3. An orthographic projection of the second black matrices41on the base substrate10covers an orthographic projection of the touch electrodes on the base substrate10, and there is an overlapping area between an orthographic projection of the third openings K3on the base substrate10and an orthographic projection of the second openings K2on the base substrate10.

Similar to the principle of the aforementioned embodiments, the first light shield layer of the present embodiment may be an opaque organic material layer, which may be disposed on the first planarization layer19or the pixel define layer21. Alternatively, the first light shield layer in the present embodiment may also be made of a metal layer, which may be disposed at any one of the following positions: on a second source-drain metal layer39. between the base substrate10and a buffer layer11, and between a first base substrate101and a second base substrate102.

The present embodiment also achieves the technical effects of the aforementioned embodiments, which include blocking out stray light through the light shield part LSP, allowing fingerprint reflected light to transmit and reach the fingerprint identification sensor35through the light transmission part LTP and the first openings K1, enabling light to pass through the screen for fingerprint identification without increasing power consumption, with advantages of simple manufacturing process, high production efficiency, low production cost, high yield, which has a good application prospect; and providing second openings K2on the first black matrices30between the color filters31with different colors, pin-hole imaging a fingerprint in contact with the display panel onto the fingerprint identification sensor35through the second openings K2.

In another embodiment of the present disclosure, the present embodiment is an extension of the aforementioned embodiments. The color film layer in the aforementioned embodiments includes a first black matrix30, and the first black matrix30is provided with a second opening K2which forms the light transmission part LTP. The color film layer in the present embodiment includes a polarizer which forms the light transmission part LTP. As shown inFIG.18toFIG.22, the display panel according to the present embodiment includes multiple pixel units disposed in a matrix, and each pixel unit includes multiple sub-pixels. For example, each pixel unit may include three sub-pixels, namely red sub-pixel R, green sub-pixel G and blue sub-pixel B. The color film layer of the display panel of the present embodiment includes color filters31with different colors and a polarizer42disposed between the color filters31with different colors, wherein the polarizer42forms the light transmission part LTP, and a fingerprint in contact with the display panel is pin-hole imaged on a fingerprint identification sensor35through the first opening K1.

As shown inFIGS.18to22, the display panel includes a base substrate10, a drive structure layer401, a first planarization layer19, a first electrode20, a pixel define layer21, a spacer layer22, an organic light emitting layer23, a second electrode24, an encapsulation layer25, a touch structure layer402, a color film layer, a coating protective layer32and a cover plate34which are disposed on the base substrate10.

The drive structure layer401is disposed on the base substrate10and the drive structure layer401in each sub-pixel includes a first thin film transistor. The first planarization layer19is disposed on the drive structure layer401. The first electrode20is disposed on the first planarization layer19and connected to the first thin film transistor in the drive structure layer401through a via hole provided on the first planarization layer19. The pixel define layer21is disposed on the first planarization layer19and includes multiple pixel openings and retaining walls around the pixel openings, wherein the pixel openings expose the first electrodes20. The spacer layer22is disposed on the pixel define layer21. The organic light emitting layer23is disposed on the first electrode20. The second electrode24is disposed on the organic light emitting layer23. The encapsulation layer25is disposed on the second electrode24and covers the entire base substrate10. The touch structure layer402is disposed on the encapsulation layer25. The color film layer is disposed on the touch structure layer402. The coating protective layer32is disposed on the color film layer. The cover plate34is disposed on the coating protective layer32.

In the present embodiment, the color film layer includes color filters31with different colors and a polarizer42disposed between the color filters31with different colors, wherein the polarizer42forms the light transmission part LTP, and the first opening K1pin-hole images a fingerprint in contact with the display panel onto the fingerprint identification sensor35.

In an exemplary embodiment, as shown inFIGS.7to11, the display panel further includes a cover plate34, and a distance between the cover plate34and first opening K1in the direction perpendicular to the display panel is greater than a distance between the first opening K1and the fingerprint identification sensor35in the direction perpendicular to the display panel. Since the distance between the first opening K1and an outermost side of a screen is an object distance, and the distance between the first opening K1and the fingerprint identification sensor35is an image distance, the imaging area may be increased and the density and number of pinhole arrays may be reduced when the object distance is greater than the image distance.

In an exemplary embodiment, in order to increase the distance between the cover plate34and the first opening K1in the direction perpendicular to the display panel, the cover plate34may be made into a multilayer structure. For example, the cover plate34may be made into a double-layer structure.

In an exemplary embodiment, a shape of the first opening K1may be square, circle, polygonal, etc.

In an exemplary embodiment, an aperture of the first opening K1may be 3 to 30 microns.

A first light shield layer in the present embodiment may be an opaque organic material layer, which may be disposed on a first planarization layer19or a pixel define layer21. Alternatively, the first light shield layer in the present embodiment may also be made of a metal layer, which may be disposed at any one of the following positions: on a second source-drain metal layer39, between the base substrate10and a buffer layer11, and between a first base substrate101and a second base substrate102.

In an exemplary embodiment, as shown inFIG.18, the material of a retaining wall is an organic light shield material, and the retaining wall is provided with a first opening K1, and the retaining wall forms the light shield part LSP.

In another exemplary embodiment, as shown inFIG.19, a material of the first planarization layer19is an organic light shield material, the first planarization layer19is provided thereon with the first opening K1, and the first planarization layer19forms the light shield part LSP.

In still another exemplary embodiment, as shown inFIG.20, a drive structure layer401includes a buffer layer11, an active layer12, a first gate insulating layer13, a first gate electrode layer14, a second gate insulating layer15, a second gate electrode layer16, a first interlayer insulating layer17, a first source-drain metal layer18, a second interlayer insulating layer38and a second source-drain metal layer39which are sequentially stacked on a base substrate10, wherein the second source-drain metal layer39is provided with a first opening K1and the second source-drain metal layer39forms the first light shield layer.

In still another exemplary embodiment, as shown inFIG.21, a drive structure layer401includes a buffer layer11, an active layer12, a first gate insulating layer13, a first gate electrode layer, a second gate insulating layer15, a second gate electrode layer16, a first interlayer insulating layer17and a first source-drain metal layer18which are sequentially stacked on a base substrate10, and a light shield layer40disposed between the base substrate10and the buffer layer11forms the first light shield layer.

In still another exemplary embodiment, as shown inFIG.22, the base substrate10includes a first base substrate101and a second base substrate102, and a light shield layer40disposed between the first base substrate101and the second base substrate102forms the first light shield layer.

The present embodiment also achieves the technical effects of the aforementioned embodiments, which include blocking out stray light through the light shield part LSP, allowing fingerprint reflected light to transmit and reach the fingerprint identification sensor35through the light transmission part LTP and the first opening K1, and enabling light to pass through the screen for fingerprint identification without increasing power consumption with advantages of simple manufacturing process, high production efficiency, low production cost and high yield, etc, which has a great application prospect. Meanwhile, in the present embodiment, a polarizer42is disposed between color filters31with different colors, and the light transmission part LTP is formed by the polarizer42, and a fingerprint in contact with the display panel are pin-hole imaged on the fingerprint identification sensor35through the first opening K1.

In another embodiment of the present disclosure, the present embodiment is an extension of the aforementioned embodiments. The fingerprint identification sensor35in the aforementioned embodiments is disposed at the bottom of the display panel, and the fingerprint identification sensor35in the present embodiment is disposed inside the display panel. The fingerprint identification sensor35of the present embodiment may be a PIN-type photoelectric sensor43manufactured by an amorphous silicon process.

As shown inFIG.23andFIG.24, the display panel provided in the present embodiment includes multiple pixel units disposed in a matrix, and each pixel unit includes multiple sub-pixels. For example, each pixel unit may include three sub-pixels, namely red sub-pixel R, green sub-pixel G and blue sub-pixel B. In the display panel of the present embodiment, a PIN-type photoelectric sensor43is provided on a drive structure layer401, the drive structure layer401includes a second thin film transistor, and the PIN-type photoelectric sensor43is connected to the second thin film transistor in the drive structure layer401.

As shown inFIGS.23and24, the display panel includes a base substrate10, and the drive structure layer401, a photoelectric sensor layer, a first planarization layer19, a first electrode20, a pixel define layer21, a spacer layer22, an organic light emitting layer23, a second electrode24, an encapsulation layer25, a touch structure layer402, a color film layer, a coating protective layer32and a cover plate34which are disposed on the base substrate10.

The drive structure layer401disposed on the base substrate10and the drive structure layer401in each sub-pixel includes a first thin film transistor and a second thin film transistor. The photoelectric sensor layer is disposed on the drive structure layer401and includes a PIN-type photoelectric sensor43connected to the second thin film transistor in the drive structure layer401, the second thin film transistor is used to turn on or off the PIN photoelectric sensor43. The first planarization layer19is disposed on the photoelectric sensor layer. The first electrode20is disposed on the first planarization layer19and connected to the first thin film transistor in the drive structure layer401through a via hole provided on the first planarization layer19. The pixel define layer21disposed on the first planarization layer19and includes multiple pixel openings and retaining walls around the pixel openings, wherein the pixel openings expose the first electrodes20. The spacer layer22is disposed on the pixel define layer21. The organic light emitting layer23is disposed on the first electrode20. The second electrode24is disposed on the organic light emitting layer23. The encapsulation layer25disposed on the second electrode24and covers the entire base substrate10. The touch structure layer402is disposed on the encapsulation layer25, and the color film layer is disposed on the touch structure layer402. The coating protective layer32is disposed on the color film layer. The cover plate34is disposed on the coating protective layer32.

As shown inFIG.23, the color film layer includes color filters31with different colors and a first black matrix30disposed between the color filters31with different colors. The first black matrix30is provided with a second opening K2, there is an overlapping area between an orthographic projection of the second opening K2on the base substrate10and an orthographic projection of a fingerprint identification sensor35on the base substrate10, the second opening K2pin-hole images a fingerprint in contact with the display panel onto the fingerprint identification sensor35, and the second opening K2forms the light transmission part LTP.

As shown inFIG.24, the color film layer includes color filters31with different colors and a polarizer42disposed between the color filters31with different colors, the polarizer42forms the light transmission part LTP, and the first opening K1pin-hole images a fingerprint in contact with the display panel onto the fingerprint identification sensor35.

A first light shield layer in the present embodiment may be an opaque organic material layer, which may be disposed on the first planarization layer19or the pixel define layer21.

In an exemplary embodiment, as shown inFIG.23, a material of the retaining walls is an organic light shield material, and a retaining wall is provided with a first opening K1, and the retaining wall forms the light shield part LSP.

In another exemplary embodiment, a material of the first planarization layer19is an organic light shield material, the first planarization layer19is provided with a first opening K1, and the first planarization layer19forms the light shield part LSP.

In an exemplary embodiment, a distance between the cover plate34and the first opening K1in the direction perpendicular to the display panel is greater than a distance between the first opening K1and the fingerprint identification sensor35in the direction perpendicular to the display panel.

The present embodiment also achieves the technical effects of the aforementioned embodiments, which includes blocking out stray light through the light shield part LSP, allowing fingerprint reflected light to transmit and reach the fingerprint identification sensor35through the light transmission part LTP and the first opening K1, and enabling light to pass through the screen for fingerprint identification without increasing power consumption with the advantages of simple manufacturing process, high production efficiency, low production cost and high yield, etc., which has a great application prospect. In the present embodiment, a pin-type photoelectric sensor43is disposed on a drive structure layer401, and a second thin film transistor disposed in the drive structure layer401is used to turn on or off the pin-type photoelectric sensor43.

In another embodiment of the present disclosure, the present embodiment is an extension of the aforementioned embodiments. A display panel of the present embodiment is provided with a filter layer44on a fingerprint identification sensor35, and the filter layer44is disposed on a path where the fingerprint reflected light pass through the first opening K1to reach the fingerprint identification sensor.

As shown inFIGS.25and26, the display panel according to the present embodiment includes a base substrate10, and a drive structure layer401, a first planarization layer19, a first electrode20, a pixel define layer21, a spacer layer22, an organic light emitting layer23, a second electrode24, an encapsulation layer25, a touch structure layer402, a color film layer, a coating protective layer32and a cover plate34which are disposed on the base substrate10. The drive structure layer401disposed on the base substrate10, and the drive structure layer401in each sub-pixel includes a first thin film transistor. The first planarization layer19is disposed on the drive structure layer401. The first electrode20is disposed on the first planarization layer19and connected to the first thin film transistor in the drive structure layer401through a via hole provided on the first planarization layer19. The pixel define layer21is disposed on the first planarization layer19and includes multiple pixel openings and retaining walls around the pixel openings, wherein the pixel openings expose the first electrodes20. The spacer layer22is disposed on the pixel define layer21. The organic light emitting layer23is disposed on the first electrode20. The second electrode24is disposed on the organic light emitting layer23. The encapsulation layer25is disposed on the second electrode24and covers the entire base substrate10. The touch structure layer402is disposed on the encapsulation layer25. The color film layer is disposed on the touch structure layer402. The coating protective layer32is disposed on the color film layer. The cover plate34is disposed on the coating protective layer32.

In an exemplary embodiment, as shown inFIG.25andFIG.26, a color film layer includes color filters31with different colors and a first black matrix30disposed between the color filters31with different colors. The first black matrix30is provided with a second opening K2. There is an overlapping area between an orthographic projection of the second opening K2on a base substrate10and an orthographic projection of a fingerprint identification sensor35on the base substrate10. The second opening K2pin-hole images a fingerprint in contact with the display panel onto the fingerprint identification sensor35and the second opening K2forms the light transmission part.

In an exemplary embodiment, the filter layer44is disposed on a light transmission part LTP between the color filters31with different colors.

In an exemplary embodiment, as shown inFIG.25, the filter layer44is disposed on a same layer as the color film layer, and the filter layer44includes multiple filters with a first color, each of the multiple filters with the first color covers one second opening K2. The filters with the first color are used for filtering out light which interferes with fingerprint reflected light. For example, the filters with the first color may filter out light (such as infrared light) that may pass through a finger in external light.

In an exemplary embodiment, the filters with the first color are green filters (referring to filters that may transmit green light) or cyan filters (referring to filters that may transmit cyan light).

Under-screen fingerprint identification uses light which is emitted by OLED and reflected by a human finger and then enters a fingerprint identification sensor under a screen. Ridges on the finger reflect the light differently, thus bright and dark stripes are formed. Because a human finger has a certain transmittance to infrared light, red light is not emitted when the fingerprint identification is performed, instead, green light (with high luminous efficiency) is adopted or green light and blue light are adopted. However, a human finger has a certain transmittance to infrared light, so infrared light in external light will also enter the fingerprint identification sensor through the finger, which will interference with a real fingerprint signal. In the display panel of the embodiment of the present disclosure, a layer of green or cyan filters are manufactured above the fingerprint identification sensor35, which are used to filter out infrared light transmitted by external light through the finger.

In another exemplary embodiment, as shown inFIG.26, the spacer layer22includes a filter material of a first color, and the spacer layer22serves as the filter layer44. The filter material of the first color is used for filtering out light which interferes with the reflected light of a fingerprint. For example, the filter material of the first color is a green filter material (which may transmit green light) or a cyan filter material (which may transmit cyan light).

In an exemplary embodiment, a filter layer in the present embodiment may be placed at any position on a light path where fingerprint reflected light enters the fingerprint identification sensor through the first opening K1, which is not limited in the present disclosure.

The present embodiment also achieves the technical effects of the aforementioned embodiments, which includes blocking out stray light through the light shield part LSP, allowing fingerprint reflected light to transmit and reach the fingerprint identification sensor35through the light transmission part LTP and the first opening K1, and enabling light to pass through the screen for fingerprint identification without increasing power consumption with the advantages of simple manufacturing process, high production efficiency, low production cost and high yield, etc, which has a great application prospect. In addition, in the present embodiment, the filter layer44is disposed on the path where the fingerprint reflected light passes through the first openings K1to reach the fingerprint identification sensor, so as to filter out the infrared light in the external light and enhance the fingerprint identification effect.

In another embodiment of the present disclosure, a method for manufacturing a display panel is further provided. As shown inFIG.27, a method for manufacturing a display panel according to an embodiment of the present disclosure includes:

S1. forming a first light shield layer above a base substrate, wherein the first light shield layer includes a first opening and a light shield part.

S2. forming a color film layer above the first light shield layer, wherein the color film layer includes color filters with different colors and a light transmission part disposed between the color filters with different colors, the light transmission part and the first opening are used for allowing fingerprint reflected light to transmit and reach a fingerprint identification sensor, and the light shield part is used for blocking out stray light.

S3. attaching the fingerprint identification sensor below the base substrate.

In an exemplary embodiment, forming the first light shield layer above the base substrate in S1may include any one of the following:the base substrate including a first base substrate and a second base substrate, forming the first light shield layer on the first base substrate, and forming the second base substrate on a surface of the first light shield layer away from the first base substrate;forming the first light shield layer on the base substrate, and forming a pixel structure layer on the first light shield layer;forming a pixel structure layer on the substrate, wherein the pixel structure layer includes a buffer layer, an active layer, a first gate insulating layer, a first gate electrode layer, a second gate insulating layer, a second gate electrode layer, a first interlayer insulating layer, a first source-drain metal layer, a second interlayer insulating layer and a second source-drain metal layer which are sequentially stacked on the base substrate and the second source-drain metal layer forms the first light shield layer;forming a pixel structure layer on base the substrate, forming a first planarization layer on a surface of the pixel structure layer away from the base substrate, forming a first electrode and a pixel define layer on a surface of the first planarization layer away from the pixel structure layer, wherein the pixel define layer includes multiple openings and retaining walls around the openings, the first openings expose the first electrode, the retaining walls are provided with first openings, a material of the retaining walls is an organic light shield material, and the retaining walls form the first light shield layer; andforming a pixel structure layer on the base substrate, and forming a first planarization layer on a surface of the pixel structure layer away from the base substrate, wherein the first planarization layer is made of an organic light shield material and is provided with a first opening, and the first planarization layer forms the first light shield layer.

In an exemplary embodiment, the color film layer includes color filters with different colors and a first black matrix disposed between the color filters with different colors. Before attaching the fingerprint identification sensor under the base substrate, the method further includes:providing the first black matrix with a second opening, there is an overlapping area between an orthographic projection of the second opening on a base substrate and an orthographic projection of the fingerprint identification sensor on the base substrate, and the second opening pin-hole images a fingerprint in contact with the display panel onto the fingerprint identification sensor, and the second opening forms the light transmission part.

In another exemplary embodiment, the color film layer includes color filters with different colors and a polarizer disposed between the color filters with different colors, the polarizer forms the light transmission part, and the first opening pin-hole images a fingerprint in contact with the display panel onto the fingerprint identification sensor.

In an exemplary embodiment, before forming the color film layer above the first light shield layer, the method further includes:forming a touch structure layer above the first light shield layer, wherein the touch structure layer includes multiple touch electrodes, and an orthographic projection of the touch electrodes on a base substrate does not overlap with an orthographic projection of an organic light emitting layer on the base substrate.

In another exemplary embodiment, after forming the color film layer above the first light shield layer, the method further includes:forming a touch structure layer and a second black matrix layer above the color film layer, wherein the second black matrix layer includes multiple second black matrices, and the multiple second black matrices are provided with third openings and the touch structure layer includes multiple touch electrodes; an orthographic projection of the second black matrices on the base substrate covers an orthographic projection of the touch electrodes on the base substrate, and there is an overlapping area between an orthographic projection of the third openings on the base substrate and an orthographic projection of the first openings on the base substrate.

In another embodiment of the present disclosure, a method for manufacturing a display panel according to an embodiment of the present disclosure includes:forming a drive structure layer above a base substrate;forming a fingerprint identification sensor on a surface of the drive structure layer away from the base substrate;forming a first light shield layer above the fingerprint identification sensor, wherein the first light shield layer includes a first opening and a light shield part;forming a color film layer above the first light shield layer, wherein the color film layer includes color filters with different colors and a light transmission part disposed between the color filters with different colors, wherein the light transmission part and the first opening are used for allowing fingerprint reflected light to transmit and reach the fingerprint identification sensor, and the light shield part is used for blocking out stray light.

In the present embodiment, the structures, materials, relevant parameters and detailed manufacturing processes of display panel have been described in detail in the above embodiments, and will not be described here again.

According to the method for manufacturing the display panel provided in the present embodiment, stray light is blocked out by the light shield part, and fingerprint reflected light is allowed to transmit and reach the fingerprint identification sensor through the light transmission part and the first opening, so that light may pass through the screen for fingerprint identification without increasing power consumption with advantages of simple manufacturing process, high production efficiency, low production cost and high yield, etc., which has a great application prospect.

In another embodiment of the present disclosure, a display apparatus including the display panel of the above-mentioned embodiments is further provided. The display apparatus may be any product or component with a display function such as a mobile phone, a tablet computer, a television, a display, a laptop computer, a digital photo frame, a navigator, etc.

In the description of the present disclosure, it should be understood that an orientation or position relationship indicated by the terms “middle”, “upper”, “lower”, “front”, “rear”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the apparatus or element referred to must have the specific orientation, or be constructed and operated in the specific orientation, and thus cannot be interpreted as a limitation on the present disclosure.

In the description of embodiments of the present disclosure, it should be noted that unless otherwise clearly specified and defined, the terms “install”, “connect”, “couple” should be broadly interpreted, for example, it may be connected fixedly or connected detachably, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or may be indirectly connected through an intermediary, or may be an internal connection between two elements. For those of ordinary skills in the art, the specific meanings of the above terms in the present disclosure may be understood according to specific situations.

Although the embodiments disclosed in the present disclosure are as described above, the described contents are only the embodiments for facilitating understanding of the present disclosure, which are not intended to limit the present disclosure. A person skilled in the art to which the present disclosure pertains may make any modifications and variations in the form and details of implementation without departing from the spirit and scope of the present disclosure. Nevertheless, the scope of patent protection of the present disclosure shall still be determined by the scope defined by the appended claims.