CN111708205A

CN111708205A - Array substrate, display device, color film substrate and display device

Info

Publication number: CN111708205A
Application number: CN202010700234.2A
Authority: CN
Inventors: 王雷; 张磊; 李昌峰; 王迎姿
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2020-09-25

Abstract

The embodiment of the invention provides an array substrate, a display device, a color film substrate and a display device, relates to the technical field of display, and can solve the problem of low fingerprint identification performance of the display device; the first substrate has a pixel region; a plurality of pixel circuit arrays are arranged in the pixel area; the fingerprint identification module is arranged on one side of the pixel circuit, which is far away from the first substrate, and the vertical projection of the fingerprint identification module on the first substrate is positioned in the pixel area; the fingerprint identification module comprises a plurality of photoelectric conversion elements; a plurality of light-shielding retaining walls; the shading retaining wall is arranged on one side, away from the first substrate, of the fingerprint identification module and is provided with a first opening area; at least a part of a vertical projection of one of the photoelectric conversion elements on the first substrate is located within a vertical projection of the first opening area on the first substrate.

Description

Array substrate, display device, color film substrate and display device

Technical Field

The application relates to the technical field of display, in particular to an array substrate, a display device, a color film substrate and a display device.

Background

The fingerprint refers to uneven lines on the skin on the front of the tail end of a human finger; wherein the raised locations are referred to as ridges and the recessed locations are referred to as valleys. Fingerprints have become almost the pronoun of biometric identification due to their lifetime invariance, uniqueness and convenience.

As the display panel is developing towards the direction of ultra-thin, high color gamut, wide viewing angle and integration, integrating the fingerprint identification technology into the display area of the display panel and realizing the optical fingerprint identification is a research hotspot at present.

Disclosure of Invention

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, an array substrate is provided, which includes: a first substrate having a pixel region; a plurality of pixel circuits arranged in the pixel region in an array; the fingerprint identification module is arranged on one side of the pixel circuit, which is far away from the first substrate, and the vertical projection of the fingerprint identification module on the first substrate is positioned in the pixel area; the fingerprint identification module comprises a plurality of photoelectric conversion elements; a plurality of light-shielding retaining walls; the shading retaining wall is arranged on one side, away from the first substrate, of the fingerprint identification module and is provided with a first opening area; at least a part of a vertical projection of one of the photoelectric conversion elements on the first substrate is located within a vertical projection of the first opening area on the first substrate.

In some embodiments, the light blocking wall is an annular spacer; the perforated portion of the annular spacer is the first open area.

In some embodiments, the width of the sidewall of the annular spacer is greater than or equal to 1 um; the width of the side wall is a distance between a boundary of the annular spacer close to the photoelectric conversion element and a boundary of the annular spacer far from the photoelectric conversion element.

In some embodiments, the light-blocking wall comprises at least one spacer group; each spacer group comprises a plurality of spacers which are sequentially arranged at intervals to form an annular structure; the aperture portion of the ring structure is the first open area.

In some embodiments, the at least one spacer group comprises a first spacer group and a second spacer group; the annular structures of the first spacer group are nested in the annular structures of the second spacer group; the shock insulators of the first shock insulator group and the shock insulators of the second shock insulator group are distributed in a staggered mode.

In some embodiments, an orthographic projection of the spacer on the first substrate has a first pattern; the size of the first pattern is greater than or equal to 1 um.

In some embodiments, the first graphic is circular in shape; two adjacent the interval between the shock insulator equals, just the scope of interval is 1um ~ 10 um.

In some embodiments, the light transmittance of the light-shielding retaining wall is less than or equal to 50%.

In a second aspect, a display device is provided, which includes: the color film substrate and the array substrate are used for manufacturing the liquid crystal display panel; the liquid crystal layer is arranged between the color film substrate and the substrate; the color film substrate comprises: a black matrix corresponding to the photoelectric conversion element and having a second opening region; the second opening area is communicated with the first opening area.

In a third aspect, a color filter substrate is provided, where the color filter substrate includes: a second substrate; a color filter layer disposed on the second substrate; the color filter layer comprises a plurality of filter units arranged in an array manner and a black matrix arranged between two adjacent filter units; the black matrix has a third opened region; a plurality of light-shielding retaining walls; the shading retaining wall is arranged on one side, away from the second substrate, of the color filter layer and is provided with a fourth opening area; the fourth opening area is communicated with the third opening area, and the fourth opening area and the third opening area are used for passing through light reflected by fingers.

In some embodiments, the light blocking wall is an annular spacer; the opening part of the annular shock insulator is the fourth opening area.

In some embodiments, the light-blocking wall comprises at least one spacer group; each spacer group comprises a plurality of spacers which are sequentially arranged at intervals to form an annular structure; the opening part of the annular structure is the fourth opening area.

In a fourth aspect, a display device is provided, which includes: the array substrate and the color film substrate are arranged on the substrate; the liquid crystal layer is arranged between the array substrate and the substrate; the array substrate includes: a first substrate having a pixel region; a plurality of pixel circuits arranged in the pixel region in an array; the fingerprint identification module is arranged on one side of the pixel circuit close to the liquid crystal layer, and the vertical projection on the array substrate is positioned in the pixel area; the fingerprint identification module comprises a plurality of photoelectric conversion elements; at least a part of a perpendicular projection of the photoelectric conversion element on the second substrate is located within a perpendicular projection of the third opening region on the second substrate and a perpendicular projection of the fourth opening region on the second substrate.

The embodiment of the invention provides an array substrate, a display device, a color film substrate and a display device, wherein a shading retaining wall is arranged on one side of a fingerprint identification module, which is far away from a first substrate, and is provided with a first opening area, and at least one part of the vertical projection of a photoelectric conversion element on the first substrate is positioned in the vertical projection of the first opening area on the first substrate, namely, the photoelectric conversion element can be exposed by the first opening area, so that the photoelectric conversion element can receive light reflected by a finger through the first opening area, and the fingerprint information of a user can be identified. In addition, the light shielding retaining wall has a certain light shielding function and can surround the photoelectric conversion element, so that the light shielding retaining wall can block light rays reflected by other films on the array substrate and received by the photoelectric conversion element and external ambient light rays, and the fingerprint identification performance can be improved.

On this basis, after the array substrate and the color film substrate provided by the embodiment of the invention are assembled, the black matrix corresponding to the photoelectric conversion element in the color film substrate has a second opening area, and the first opening area is communicated with the second opening area, so that the photoelectric conversion element can receive light reflected by a finger through the first opening area and the second opening area, and the fingerprint information of a user can be identified; the light blocking wall can block the light reflected by the color filter layer from being received by the photoelectric conversion element, in other words, the light blocking wall can block stray light, so that the performance of fingerprint identification can be further improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a display device provided in the related art;

fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating region division of a liquid crystal display panel according to an embodiment of the invention;

fig. 4 is a schematic structural diagram of an lcd panel according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an array substrate according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of another array substrate according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of another display device according to an embodiment of the invention;

fig. 8 is a schematic structural diagram of another array substrate according to an embodiment of the present invention;

FIG. 9 is a schematic view of another LCD panel according to an embodiment of the present invention;

fig. 10 is a top view of a light-shielding retaining wall according to an embodiment of the present invention;

fig. 11 is a top view of another light-shielding retaining wall according to an embodiment of the present invention;

fig. 12 is a top view of another light-shielding retaining wall according to an embodiment of the present invention;

FIG. 13 is a schematic view of another LCD panel according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a color film substrate according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of another liquid crystal display panel according to an embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

Further, in this application, directional terms such as "upper," "lower," "left," "right," and the like may be used in a generic and descriptive sense only and not for purposes of limitation, with respect to the orientation of components in the figures, but also with respect to the orientation of components in the figures.

In the present application, unless expressly stated or limited otherwise, the term "coupled" is to be construed broadly, e.g., "coupled" may be a fixed connection, a removable connection, or an integral part; may be directly connected or indirectly connected through an intermediate.

As shown in fig. 1, the liquid crystal display device includes a liquid crystal display panel 3 and a backlight module 5; the backlight module 5 is disposed on a side of the light-emitting side away from the liquid crystal display panel 3. The liquid crystal display panel 3 includes an array substrate 30, a color filter substrate 31, and a liquid crystal layer 32 disposed between the array substrate 30 and the color filter substrate 31. In order to realize the performance of the liquid crystal display device, such as lightness, thinness, high color gamut, wide visual angle, integration and the like, a fingerprint identification module 301 for realizing a fingerprint identification technology is integrated in the array substrate 30, when fingerprint identification is needed, light emitted by the backlight module 5 irradiates on a finger 6 of a user through the liquid crystal display panel 3, and is formed by ridges of the finger 6; and/or the valley is reflected to the fingerprint identification module 301, and the fingerprint identification module 20 receives the ridge of the finger 6 of the user; and/or the reflected light of the valley, and identifies the fingerprint information of the user to realize the fingerprint identification function. However, because the rete of liquid crystal display panel 3 is more, the structure is more complicated, lead to except forming fingerprint identification's light, still have stray light of a large amount of inner structure reflection or scattering, and then lead to fingerprint identification's SNR to reduce even saturate, under the saturated condition of fingerprint identification SNR, fingerprint identification module can't 301 discernment be promptly user finger 6 reflected light or liquid crystal display panel 3 internally reflected light, thereby lead to fingerprint identification's performance to reduce even unable discernment. Through practical tests, the light reflected from the color film substrate 31 in the liquid crystal display panel 3 in the stray light approximately accounts for 70% of the total stray light, so that the performance of fingerprint identification can be improved after the stray light of the part is eliminated.

The first embodiment is as follows: a display device is provided, which is a Liquid Crystal Display (LCD).

The display device provided in this embodiment may be any product or component having a display function and a fingerprint identification function, such as a display, a television, a digital camera, a mobile phone, a tablet computer, an electronic photo frame, and a navigator, which is not limited in this embodiment of the present invention.

As shown in fig. 2, the main structure of the liquid crystal display device includes a frame 1, a cover plate 2, a liquid crystal display panel 3, a circuit board 4, a backlight module 5, and other accessories.

The longitudinal section of the frame 1 is U-shaped, the liquid crystal display panel 3, the circuit board 4 and other accessories are all arranged in the frame 1, the circuit board 4 is arranged below the liquid crystal display panel 3 (namely, the back surface, the surface deviating from the display surface of the liquid crystal display panel 3), and the cover plate 2 is arranged on one side of the liquid crystal display panel 3 far away from the circuit board 4. In addition, the backlight module 5 is disposed below the circuit board 4, that is, the circuit board 4 is disposed between the liquid crystal display panel 3 and the backlight module 5.

It should be noted that the Circuit Board 4 is electrically connected to the liquid crystal display panel 3, and the Circuit Board 4 generally includes a Flexible Printed Circuit (FPC), a driver chip (IC), a Printed Circuit Board (PCB), a connection substrate, and the like; the circuit board 4 is used to supply various display screen information to the liquid crystal display panel 3 after power is turned on.

In the liquid crystal display device, the backlight in the backlight module 5 emits light, and the backlight may be, for example, a Light Emitting Diode (LED). Other structures of the backlight module 5 can refer to the related art, and are not described herein.

As shown in fig. 3, the liquid crystal display panel 3 is divided into an effective display Area a1(Active Area, AA Area for short) and a peripheral Area a2 located at least on one side of the effective display Area a1, and fig. 3 illustrates an example in which the peripheral Area a2 surrounds the effective display Area a 1. The effective display area a1 includes a plurality of subpixels P. The peripheral region a2 is used for wiring, and the gate driver circuit may be provided in the peripheral region a 2.

As shown in fig. 4, the main structure of the liquid crystal display panel 3 includes an array substrate 30, a color filter substrate 31, and a liquid crystal layer 32 disposed between the array substrate 30 and the color filter substrate 31.

As shown in fig. 4, the color filter layer 311 is included in the color filter substrate 31. The color filter layer 311 at least includes a red filter unit, a green filter unit, and a blue filter unit; the color filter layer 311 further includes a black matrix 312, and the black matrix 312 is used to separate the red filter unit, the green filter unit, and the blue filter unit.

As shown in fig. 4, the liquid crystal display panel 3 further includes an upper polarizer 33 disposed on a side of the color film substrate 31 away from the liquid crystal layer 32, and a lower polarizer 34 disposed on a side of the array substrate 30 away from the liquid crystal layer 32.

For example, an optical Adhesive (OCA) may be used to adhere the upper polarizer 33 and the color film substrate 31 together; the lower polarizer 34 is attached to the array substrate 30.

The embodiment of the invention provides an array substrate 30, which can be applied to the display device of the first embodiment. As shown in fig. 5 and 6, the array substrate 30 includes a first substrate 300, a fingerprint identification module 301, a plurality of pixel circuits 302, and a plurality of light-shielding walls 303.

The first substrate 300 has a pixel region B, and a plurality of pixel circuits 302 are arranged in the pixel region B in an array. The pixel region B includes a plurality of sub-pixels P, and one pixel circuit 302 is located in one sub-pixel P. As shown in connection with fig. 3, it should be understood that the pixel region B of the first substrate 300 corresponds to the effective display region a1 of the liquid crystal display panel 3.

The fingerprint identification module 301 is disposed on a side of the pixel circuit 302 away from the first substrate 300, and a vertical projection on the first substrate 300 is located in the pixel region B; that is, the fingerprint identification module 301 is located in the effective display area a1 of the liquid crystal display panel 3. The fingerprint identification module 301 includes a plurality of photoelectric conversion elements 3011, and one photoelectric conversion element 3011 is located in one sub-pixel P.

Taking the display device as an example of the mobile phone, when all display screens of the mobile phone need to have the function of fingerprint identification, the display screen of the mobile phone is internally provided with the fingerprint identification module 301, that is, the effective display area a1 of the liquid crystal display panel 3 can be provided with the fingerprint identification module 301. Illustratively, the photoelectric conversion elements 3011 are provided in the sub-pixels P within the effective display area a 1. Or, when a part of the area in the display screen of the mobile phone needs the fingerprint identification function, the fingerprint identification module 301 is only needed to be arranged in the effective display area a1 corresponding to the display screen of the part of the area. Illustratively, the photoelectric conversion element 3011 is disposed in the sub-pixel P in the effective display region a1 corresponding to the partial region. As shown in fig. 7, in general, a partial region near the lower frame of the display screen of the mobile phone needs to have a fingerprint recognition function, and at this time, the photoelectric conversion element 3011 is disposed in the sub-pixel P in the effective display region a1 corresponding to the partial region.

For example, in the case where the photoelectric conversion element 3011 is disposed in the sub-pixel P of the effective display area a1 corresponding to the area requiring the fingerprint recognition function shown in fig. 7, the sub-pixel P of the array substrate 30 includes the thin film transistor 304, the pixel electrode 305, and the common electrode 306 on the first substrate 300, as shown in fig. 8. The thin film transistor 304 includes an active layer, a source electrode, a drain electrode, a gate electrode, and a gate insulating layer, the source electrode and the drain electrode are in contact with the active layer, respectively, and the common electrode 306 is electrically connected to the drain electrode of the thin film transistor 304. The pixel electrode 305 and the common electrode 306 are disposed at different layers, and in this case, a first insulating layer 307 is disposed between the pixel electrode 305 and the common electrode 306.

Here, the material of the first insulating layer 306 may be an inorganic material, and the inorganic material may be, for example, one or more of SiNx (silicon nitride), SiOx (silicon oxide), or SiOxNy (silicon oxynitride). The embodiment of the present invention does not limit this.

As shown in fig. 8, the sub-pixel P of the array substrate 30 further includes a fingerprint identification module 301 located on the first substrate 300, and the fingerprint identification module 301 includes a photoelectric conversion element 3011, a control structure 3012, and a current detector (the current detector is not shown in fig. 8).

The photoelectric conversion element 3011 includes a first electrode 3011a, a second electrode 3011b, and an induction layer provided between the first electrode 3011a and the second electrode 3011 b; the first electrode 3011a is a transparent electrode; the photoelectric conversion element 3011 is configured to receive light reflected by the finger 6 and generate an induced current according to the received light.

The sensing layer may be, for example, a photodiode, which is a semiconductor device that converts an optical signal into an electrical signal, and includes a PN junction, a PIN junction, or the like. Generally, the photodiode currently used is a PIN junction, which is characterized in that a semiconductor layer with a very low doping concentration is generated between a P region and an N region, and is close to an intrinsic semiconductor, so that the photodiode can be called an intrinsic layer (also called an I layer), and the I layer is added between the P region and the N region, so that the width of a depletion region can be increased, the influence of carrier diffusion movement can be reduced, and the response speed can be increased.

The control structure 3012 is electrically connected to the photoelectric conversion element 3011 and the current detector, and is configured to control on/off of the photoelectric conversion element 3011 and the current detector. The current detector is used for detecting an induced current generated by the photoelectric conversion element 3011 under the control of the control structure 3012 and acquiring fingerprint information from the induced current.

As shown in fig. 8, the control structure 3012 may be, for example, a thin film transistor, and the structure of the thin film transistor refers to the structure of the thin film transistor 304, which is not described herein again.

Illustratively, the second electrode 3011b is electrically connected to a source of the thin film transistor, and a drain of the thin film transistor is electrically connected to the current detector. On this basis, the first electrode 3011a is electrically connected to an Integrated Circuit (IC) through the conductive layer 308; the second electrode 3011b is directly electrically connected to the integrated circuit.

When fingerprint identification is required, voltages are respectively applied to the pixel electrode 305 and the common electrode 306, and at this time, the voltages on the pixel electrode 305 and the common electrode 306 control the liquid crystal to deflect, so that light emitted by the backlight source can irradiate the finger 6 of the user, and then the light is reflected by the finger 6 of the user to the photoelectric conversion element 3011. At this time, voltages are applied to the first electrode 3011a and the second electrode 3011b, respectively, through the integrated circuit to form an electric field. Under the control of the electric field, the photoelectric conversion element 3011 converts the received light reflected by the finger 6 into an induced current, the induced current passes through the control structure 3012 to the current detector, and the current detector obtains fingerprint information according to the induced current.

Illustratively, the finger 6 has a valley and a ridge, and since the intensity of the light reflected by the valley is greater than that of the light reflected by the ridge, the current generated by the photoelectric conversion element 3011 is greater, so that the current detector can detect whether the light is reflected by the valley of the finger 6 or the light is reflected by the ridge of the finger 6 according to the magnitude of the induced current.

It should be noted that the control structure 3012 in the embodiment of the present invention is driven by a thin film transistor, and the driving structure of the fingerprint identification module 301 may be referred to as a pps (passive Pixel sensors) structure. Of course, the control structure 3012 may also be driven by three thin film transistors, and the driving structure of the fingerprint identification module 301 may be referred to as an aps (active Pixel sensors) structure.

Referring again to fig. 8, there is also a second insulating layer 309 between the common electrode 306 and the conductive layer 308; the material of the second insulating layer 309 is an organic material, and the organic material may be, for example, PMMA (Polymethyl methacrylate). As shown in fig. 8, a third insulating layer 401 is included between the conductive layer 308 and the photoelectric conversion element 3011, and a fourth insulating layer 402 is included between the second electrode 3011b and the control structure 3012. The third insulating layer 401 and the fourth insulating layer 402 each include three insulating layers. In the three insulating layers, the insulating layer positioned in the middle layer is made of organic materials, and the insulating layers positioned on the two opposite sides of the middle layer are made of inorganic materials. The insulating layers on the two sides are made of inorganic materials, so that on one hand, water and oxygen in the outside air can be isolated; on the other hand, the organic insulating layer located in the middle layer can be protected, and the organic insulating layer located in the middle layer can be prevented from being scratched and damaged.

As shown in fig. 5 and 6, the light blocking wall 303 is disposed on a side of the fingerprint identification module 301 away from the first substrate 300, and has a first opening area C1; at least a part of a vertical projection of one photoelectric conversion element 3011 on the first substrate 300 is located within a vertical projection of the first opening area C1 on the first substrate 300.

In some embodiments, as shown in fig. 5, the cross section of the light blocking wall 303 has an inverted trapezoidal shape. In other embodiments, as shown in fig. 6, the cross-section of the light-shielding walls 303 is in the shape of a parallelogram.

The light-shielding walls 303 are defined as that the transmittance of the light-shielding walls 303 to light is less than or equal to 50%, that is, the light-shielding walls 303 only allow 50% of light to pass through, so that the light-shielding walls 303 have a certain light-shielding function.

It should be noted that, when the transmittance of the light shielding walls 303 to light is zero, the light is completely blocked by the light shielding walls 303. On this basis, the material of the light shielding wall 303 may be, for example, carbon black, resin mesoporous black silicon rubber, nano-porous alumina, or other suitable light shielding material, which is not limited in the present invention. In some embodiments, the material of the light-shielding walls 303 is the same as the material of the black matrix 312, and is black resin.

Note that the light-shielding walls 303 have a first opening region C1, that is, the vertical projection of the light-shielding walls 303 on the first substrate 300 can enclose the photoelectric conversion element 3011. It should be understood that the enclosure here may be a full enclosure; or may be semi-enclosed.

In some embodiments, a part of a vertical projection of one photoelectric conversion element 3011 on the first substrate 300 is located within a vertical projection of the first opening region C1 on the first substrate 300. In other embodiments, the entirety of the vertical projection of one photoelectric conversion element 3011 on the first substrate 300 is located within the vertical projection of the first opening area C1 on the first substrate 300. On this basis, more light reflected by the finger 6 can reach the photoelectric conversion element 3011 through the first opening region C1, that is, the photoelectric conversion element 3011 can receive more light reflected by the finger 6, so that the accuracy of fingerprint information can be improved.

As shown in fig. 4 and 9, after the array substrate 30 according to the embodiment of the present invention is assembled with the color filter substrate 31 according to the embodiment, the black matrix 312 corresponding to the photoelectric conversion element 3011 in the color filter substrate 31 has a second open area C2, and the first open area C1 and the second open area C2 are through.

In some embodiments, a perpendicular projection of the first opening region C1 on the first substrate 300, a perpendicular projection of the second opening region C2 on the first substrate 300, and a perpendicular projection of the photoelectric conversion element 3011 on the first substrate 300 completely overlap. With this arrangement, it is possible to ensure that the photoelectric conversion element 3011 receives more light reflected from the finger 6 through the first and second opening regions C1 and C2, and thus the accuracy of fingerprint information can be improved.

With the array substrate 30 provided in the embodiment of the present invention, since the light-shielding retaining wall 303 is disposed on the side of the fingerprint identification module 301 away from the first substrate 300 and has the first opening region C1, at least a portion of the vertical projection of the photoelectric conversion element 3011 on the first substrate 300 is located in the vertical projection of the first opening region C1 on the first substrate 300, that is, the first opening region C1 can expose the photoelectric conversion element 3011, so that the photoelectric conversion element 3011 can receive the light reflected by the finger 6 through the first opening region C1, thereby identifying the fingerprint information of the user. In addition, since the light-shielding wall 303 has a certain light-shielding function and can surround the photoelectric conversion element 3011, the light-shielding wall 303 can block the photoelectric conversion element 3011 from receiving light reflected by other film layers on the array substrate 30 and ambient light from the outside, so as to improve the performance of fingerprint identification.

On this basis, when the array substrate 30 provided in the embodiment of the present invention is applied to the display device, since the black matrix 312 corresponding to the photoelectric conversion element 3011 in the color filter substrate 31 has the second open area C2, and the first open area C1 is communicated with the second open area C2, the photoelectric conversion element 3011 can receive the light reflected by the finger 6 through the first open area C1 and the second open area C2, so as to identify the fingerprint information of the user; the light-shielding walls 303 can block the light reflected by the color filter layer 311 from being received by the photoelectric conversion device 3011, in other words, the light-shielding walls 303 can block stray light, so that the performance of fingerprint identification can be further improved.

In some embodiments, as shown in fig. 10, the light blocking wall 303 is an annular spacer; the apertured portion of the annular spacer is a first open area C1.

In the case that the light-shielding walls 303 are annular spacers, the light-shielding walls 303 are disposed in the liquid crystal layer 32, and the light-shielding walls 303 are further configured to support the liquid crystal cell thickness between the array substrate 30 and the color film substrate 31.

In the embodiment of the present invention, since the light-shielding wall 303 is an annular spacer, it is not necessary to separately prepare the light-shielding wall 303, so that the manufacturing process can be simplified, and since the light-shielding wall 303 is annular and the annular opening portion is the first opening area C1, the annular spacer can completely block the light reflected by the color filter layer 311, thereby further improving the fingerprint identification performance.

In some embodiments, as shown in fig. 10, the width of the sidewall of the annular spacer is greater than or equal to 1 um; the width of the side wall is a distance L1 between a boundary of the annular spacer close to the photoelectric conversion element 3011 and a boundary of the annular spacer distant from the photoelectric conversion element 3011. By the design, when the width of the side wall of the annular spacer is larger than or equal to 1um, the annular spacer can have enough supporting force when supporting the thickness of the liquid crystal box.

In some embodiments, as shown in fig. 11, the light blocking wall 303 includes at least one spacer group 3031; each Spacer group 3031 comprises a plurality of spacers (PS for short), and the spacers are sequentially arranged at intervals to form a ring structure; the aperture portion of the annular structure is a first open area C1.

Optionally, the light-shielding retaining wall 303 includes at least one spacer group 3031, the light-shielding retaining wall 303 includes only one spacer group 3031, or the light-shielding retaining wall 303 includes two or more spacer groups 3031.

In the embodiment of the present invention, when the light-shielding retaining wall 303 includes at least one spacer group 3031, since the spacer group 3031 is disposed in the liquid crystal layer 32, the spacer group 3031 is disposed as a plurality of spacers, and the spacers are arranged at intervals to form a ring structure, so that liquid crystal molecules can flow through a gap between two adjacent spacers, which is beneficial to uniformity of liquid crystal molecule flow, and is beneficial to brightness uniformity of a display screen of the display device.

In some embodiments, as shown in fig. 12, the at least one spacer group 3031 includes a first spacer group 3031a and a second spacer group 3031 b; the ring structure of the first spacer group 3031a is nested within the ring structure of the second spacer group 3031 b; the spacers in the first spacer group 3031a are distributed in a staggered manner with respect to the spacers in the second spacer group 3031 b.

On the basis, the orthographic projection of the spacer on the first substrate 300 is provided with a first pattern, and the size of the first pattern is larger than or equal to 1 um.

The shape of the first pattern is not limited. For example, the shape of the first pattern may be a regular or irregular shape such as a circle, a square, a rectangle, a triangle, etc.

Further, the size of the first figure is defined as the shortest distance between any two points in the boundary of the first figure.

Illustratively, when the shape of the first figure is a circle, the size of the first figure is the diameter of the circle; when the first graph is square, the size of the first graph is the side length of the square; when the shape of the first graph is a rectangle, the size of the first graph is the side length of the short side of the rectangle; when the shape of the first pattern is an irregular shape, the size of the first pattern is the shortest distance between any two points in the irregular shape.

Under the condition that the shape of the first graph is circular, the distance between two adjacent shock insulators is equal, and the range of the distance is 1 um-10 um. On the basis, as shown in fig. 12, the spacing L2 between two adjacent spacers is the shortest distance between the boundaries of two adjacent circles. Illustratively, the spacing L2 ranges from 1um, 5um, 10 um.

In the above embodiment, since the ring-shaped structure of the first spacer group 3031a is nested in the ring-shaped structure of the second spacer group 3031b, that is, the vertical projection of the first spacer group 3031a on the first substrate 300 is close to the vertical projection of the photoelectric conversion element 3011 on the first substrate 300 with respect to the vertical projection of the second spacer group 3031b on the first substrate 300; in addition, the spacers in the second spacer group 3031b are distributed at the interval between two adjacent spacers in the first spacer group 3031a, and the distance between two adjacent spacers is equal, and the range of the distance is 1um to 10um, so that the first spacer group 3031a and the second spacer group 3031b can not only block the light reflected by the color filter layer 311, but also facilitate the uniformity of the flow of the liquid crystal molecules, in other words, the design not only can improve the performance of fingerprint identification, but also can ensure the brightness uniformity of the display screen of the display device.

Example two: a display device is provided, which is a liquid crystal display device. The structure of the liquid crystal display device can refer to fig. 2, and the description of the liquid crystal display device in the first embodiment is omitted here for brevity.

As shown in fig. 13, the liquid crystal display panel 3 of the liquid crystal display device includes an array substrate 30, a color filter substrate 31, and a liquid crystal layer 32 disposed between the array substrate 30 and the color filter substrate 31.

As shown in fig. 13, the array substrate 30 includes a first substrate 300 and a plurality of pixel circuits 302 disposed on the first substrate 300; the first substrate 300 has a pixel region B in which a plurality of pixel circuits 302 are arrayed; the array substrate 30 further includes a fingerprint identification module 301 disposed on a side of the pixel circuit 302 away from the first substrate 300, and a vertical projection on the array substrate 30 is located in the pixel region B, where the fingerprint identification module 301 includes a plurality of photoelectric conversion elements 3011.

For an example of the specific structure of the array substrate 30, the specific structure of the photoelectric conversion element 3011, and how the fingerprint identification module 301 implements the fingerprint identification function, reference may be made to the first embodiment, and details are not repeated here.

It should be noted that the specific structure of the array substrate 30 included in the display device in this embodiment does not include the light-shielding wall 303 in the first embodiment.

The embodiment of the invention also provides a color film substrate 31 which can be applied to the display device of the second embodiment. As shown in fig. 14, the color filter substrate 31 includes a second substrate 310, a color filter layer 311, and a plurality of light-shielding walls 303.

The color filter layer 311 is disposed on the second substrate 310, and the color filter layer 311 includes a plurality of filter units arranged in an array, and a black matrix 312 disposed between two adjacent filter units; the black matrix 312 has a third opened region C3. The light-shielding dam 303 is disposed on a side of the color filter layer 311 away from the second substrate 310, and has a fourth opening C4; the fourth opening region C4 is connected to the third opening region C3, and the fourth opening region C4 and the third opening region C3 are used to pass light reflected by the finger 6.

Exemplarily, referring to fig. 14, the color filter layer 311 includes at least a red filter unit, a green filter unit, and a blue filter unit.

For the definition, material, illustration of specific structure, and technical effects of the light-shielding wall 303, reference may be made to the light-shielding wall 303 in the first embodiment, and details are not repeated here.

When the color filter substrate 31 in the above-described embodiment is applied to the display device in the second embodiment, as shown in fig. 15, at least a part of the vertical projection of the photoelectric conversion element 3011 included in the fingerprint identification module 301 on the second substrate 310 is located within the vertical projection of the third open region C3 on the second substrate 310 and the vertical projection of the fourth open region C4 on the second substrate 310.

Alternatively, the perpendicular projection of the photoelectric conversion element 3011 on the second substrate 310, the perpendicular projection of the third opened region C3 on the second substrate 310, and the perpendicular projection of the fourth opened region C4 on the second substrate 310 completely overlap. With this arrangement, the photoelectric conversion element 3011 can receive more light reflected by the finger 6 through the third opening C3 and the fourth opening C4, and the accuracy of fingerprint information can be improved.

With the color filter substrate 31 provided in the embodiment of the present invention, since the black matrix 312 on the color filter substrate 31 has the third open area C3, the light-blocking wall 303 has the fourth open area C4, and the fourth open area C4 is communicated with the third open area C3, light reflected by the finger 6 can pass through the fourth open area C4 and the third open area C3 and be received by the photoelectric conversion element 3011 on the array substrate 30, thereby implementing a fingerprint identification function. Since the light-shielding walls 303 are disposed on the side of the color filter layer 311 away from the second substrate 310, the light-shielding walls 303 have a certain light-shielding function, so that the light-shielding walls 303 can block the light reflected by the color filter layer 311 from being received by the photoelectric conversion device 3011, that is, the light-shielding walls 303 can block the stray light from being received by the photoelectric conversion device 3011, thereby improving the performance of fingerprint identification.

In some embodiments, referring to fig. 10, the light blocking walls 303 are ring-shaped spacers; the open portion of the annular septum is a fourth open area C4.

In some embodiments, as shown in fig. 11, the light blocking wall 303 includes at least one spacer group 3031; each spacer group 3031 comprises a plurality of spacers which are sequentially arranged at intervals to form a ring structure; the opening portion of the ring structure is a fourth opening area C4.

On this basis, as shown in fig. 12, the at least one spacer group 3031 includes a first spacer group 3031a and a second spacer group 3031 b; the ring structure of the first spacer group 3031a is nested within the ring structure of the second spacer group 3031 b; the spacers of the first spacer group 3031a and the spacers of the second spacer group 3031b are distributed in a staggered manner.

As shown in fig. 15, in the case that the light-shielding walls 303 are annular spacers, or the light-shielding walls 303 include at least one spacer group 3031, the light-shielding walls 303 are disposed in the liquid crystal layer 32, and the light-shielding walls 303 are further used for supporting the liquid crystal cell thickness between the array substrate 30 and the color film substrate 31.

Here, as shown in fig. 5, 9, 14 and 15, in the case where the light-shielding walls 303 are disposed on the array substrate 30, as shown in fig. 5 and 9, the cross-sectional shape of the light-shielding walls 303 is an inverted trapezoid. In the case where the light-shielding walls 303 are disposed on the color filter substrate 31, as shown in fig. 14 and 15, the cross-section of each light-shielding wall 303 is in a regular trapezoid shape.

For the illustration of the specific structure of the light-shielding wall 303 in the second embodiment and the technical effects brought by the specific structure, reference may be made to the illustration of the light-shielding wall 303 in the first embodiment, and details are not described here.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An array substrate, comprising:

a first substrate having a pixel region;

a plurality of pixel circuits arranged in the pixel region in an array;

the fingerprint identification module is arranged on one side of the pixel circuit, which is far away from the first substrate, and the vertical projection of the fingerprint identification module on the first substrate is positioned in the pixel area; the fingerprint identification module comprises a plurality of photoelectric conversion elements;

a plurality of light-shielding retaining walls; the shading retaining wall is arranged on one side, away from the first substrate, of the fingerprint identification module and is provided with a first opening area; at least a part of a vertical projection of one of the photoelectric conversion elements on the first substrate is located within a vertical projection of the first opening area on the first substrate.

2. The array substrate of claim 1, wherein the light-shielding walls are annular spacers; the perforated portion of the annular spacer is the first open area.

3. The array substrate of claim 2, wherein the width of the sidewall of the annular spacer is greater than or equal to 1 um; the width of the side wall is a distance between a boundary of the annular spacer close to the photoelectric conversion element and a boundary of the annular spacer far from the photoelectric conversion element.

4. The array substrate of claim 1, wherein the light-shielding walls comprise at least one spacer group; each spacer group comprises a plurality of spacers which are sequentially arranged at intervals to form an annular structure; the aperture portion of the ring structure is the first open area.

5. The array substrate of claim 4, wherein the at least one spacer group comprises a first spacer group and a second spacer group;

the annular structures of the first spacer group are nested in the annular structures of the second spacer group;

the shock insulators of the first shock insulator group and the shock insulators of the second shock insulator group are distributed in a staggered mode.

6. The array substrate of claim 4 or 5, wherein an orthographic projection of the spacer on the first substrate has a first pattern; the size of the first pattern is greater than or equal to 1 um.

7. The array substrate of claim 6, wherein the first pattern is circular in shape; two adjacent the interval between the shock insulator equals, just the scope of interval is 1um ~ 10 um.

8. The array substrate of claim 1, wherein the light-shielding walls have a light transmittance of less than or equal to 50%.

9. A display device, comprising: a color filter substrate, and an array substrate according to any one of claims 1 to 8;

the liquid crystal layer is arranged between the color film substrate and the substrate;

the color film substrate comprises: a black matrix corresponding to the photoelectric conversion element and having a second opening region; the second opening area is communicated with the first opening area.

10. A color film substrate is characterized by comprising:

a second substrate;

a color filter layer disposed on the second substrate; the color filter layer comprises a plurality of filter units arranged in an array manner and a black matrix arranged between two adjacent filter units; the black matrix has a third opened region;

a plurality of light-shielding retaining walls; the shading retaining wall is arranged on one side, away from the second substrate, of the color filter layer and is provided with a fourth opening area;

the fourth opening area is communicated with the third opening area, and the fourth opening area and the third opening area are used for passing through light reflected by fingers.

11. The color filter substrate according to claim 10, wherein the light-blocking wall is an annular spacer; the opening part of the annular shock insulator is the fourth opening area.

12. The color film substrate according to claim 11, wherein the light-shielding retaining wall comprises at least one spacer group; each spacer group comprises a plurality of spacers which are sequentially arranged at intervals to form an annular structure; the opening part of the annular structure is the fourth opening area.

13. The color film substrate according to claim 12, wherein the at least one spacer group comprises a first spacer group and a second spacer group;

14. The color filter substrate of claim 10, wherein the light transmittance of the light-blocking walls is less than or equal to 50%.

15. A display device, comprising: an array substrate and a colour film substrate as claimed in any one of claims 10 to 14;

the liquid crystal layer is arranged between the array substrate and the substrate;

the array substrate includes: a first substrate having a pixel region;

a plurality of pixel circuits arranged in the pixel region in an array;

the fingerprint identification module is arranged on one side of the pixel circuit close to the liquid crystal layer, and the vertical projection on the array substrate is positioned in the pixel area; the fingerprint identification module comprises a plurality of photoelectric conversion elements;

at least a part of a perpendicular projection of the photoelectric conversion element on the second substrate is located within a perpendicular projection of the third opening region on the second substrate and a perpendicular projection of the fourth opening region on the second substrate.