CN108710237B

CN108710237B - Display panel and display device

Info

Publication number: CN108710237B
Application number: CN201810390037.8A
Authority: CN
Inventors: 蓝学新; 陈国照
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2022-08-12
Anticipated expiration: 2038-04-27
Also published as: CN108710237A

Abstract

The application discloses a display panel and a display device, which relate to the technical field of display and are provided with a display area and a non-display area, wherein the display area comprises a main display area and an auxiliary display area; the main display area is provided with a plurality of first pixel areas which are arranged in an array mode, each first pixel area is provided with a first color resistance layer, the auxiliary display area is provided with a plurality of second pixel areas which are arranged in an array mode, each second pixel area is provided with a second color resistance layer, and the penetration rate of each first color resistance layer is smaller than that of each second color resistance layer. Because the penetration rate of the auxiliary display area is greater than that of the main display area, the brightness of the auxiliary display area is favorably improved, the influence of the introduction of the fingerprint identification unit on the penetration rate of the auxiliary display area is compensated, the brightness difference between the main display area and the auxiliary display area is weakened, and the whole display effect of the display panel is favorably improved.

Description

Display panel and display device

Technical Field

The present application relates to the field of display technologies, and in particular, to a display panel and a display device.

Background

Human fingerprints are unique and do not deform, so that the safety of fingerprint identification is high, and meanwhile, the method is widely applied to various fields, such as the technical field of display, due to the fact that the method is simple to operate. In the field of display technologies, a mobile phone is taken as an example, and unlocking or opening of a specific application program can be completed through fingerprint identification.

With the development of science and technology, a variety of display devices with fingerprint identification functions appear in the market, such as mobile phones, tablet computers, intelligent wearable devices and the like. Like this, the user just needs to touch display device's fingerprint identification module with the finger before the display device that the operation has the fingerprint identification function, just can carry out the authority and verify, has simplified the authority verification process.

Among the prior art, generally with the fingerprint identification module integrated on display panel's TFT (Thin Film Transistor) base plate, also introduce the fingerprint identification module on current TFT's basis promptly, will make the fingerprint identification module correspond regional penetration rate greatly reduced like this, the light that the fingerprint identification module can be received is comparatively faint, consequently leads to fingerprint identification not accurate enough.

Disclosure of Invention

In view of this, the technical problem to be solved by the present application is to provide a display panel and a display device, where the fingerprint identification unit is disposed in the auxiliary display area, and the brightness of the auxiliary display area is reduced without affecting the overall display effect of the display panel, and in addition, because the penetration rate of the second color resist layer corresponding to the auxiliary display area is greater than the penetration rate of the first color resist layer corresponding to the main display area, the amount of light that can be received by the fingerprint identification unit is increased, so that the optical signal sensed by the fingerprint identification unit is strengthened, and the accuracy of fingerprint identification is improved.

In order to solve the technical problem, the application has the following technical scheme:

in a first aspect, the application provides a display panel, which is provided with a display area and a non-display area, wherein the display area comprises a main display area and an auxiliary display area, the display panel is further provided with at least one fingerprint identification unit, and the orthographic projection of the fingerprint identification unit on the plane where the display panel is located in the auxiliary display area;

the display panel comprises a main display area, an auxiliary display area and a plurality of auxiliary display areas, wherein the main display area is provided with a plurality of first pixel areas which are arranged in an array mode, each first pixel area is provided with a first color resistance layer, the auxiliary display area is provided with a plurality of second pixel areas which are arranged in an array mode, each second pixel area is provided with a second color resistance layer, and the penetration rate of each first color resistance layer is smaller than that of each second color resistance layer.

In a second aspect, the present application provides a display device, including a display panel, where the display panel is the display panel provided in the present application.

Compared with the prior art, this application display panel and display device, reached following effect:

among display panel and the display device that the application provided, the display area includes main display area and supplementary display area, the transmissivity that is located the second look of assisting the display area hinders the layer is greater than the transmissivity that is located the first look of main display area hinders the layer, because the fingerprint identification unit is located the higher supplementary display area of transmissivity, when backlight unit luminance is unanimous, the transmissivity is higher, will have more light reflection to the fingerprint identification unit in the light of touching the main part reflection, the light quantity that the fingerprint identification unit received also will increase, so make the light signal intensity that the fingerprint identification unit experienced also bigger, consequently, be favorable to promoting fingerprint identification's accuracy. In addition, as the main display area plays a main display function, the fingerprint identification unit is arranged in the auxiliary display area, the display effect of the main display area cannot be influenced even if the brightness of the auxiliary display area is reduced to some extent, and the influence on the whole display effect of the display panel is small; in addition, the penetration rate of the second color resistance layer positioned in the auxiliary display area is greater than the penetration rate of the first color resistance layer positioned in the main display area, and even if the fingerprint identification unit is introduced into the auxiliary display area, the display brightness difference between the auxiliary display area and the main display area can be effectively reduced, so that the display effect of the display panel and the display device is favorably improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a top view of a display panel according to an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view taken along line A-A of the display panel of FIG. 1;

fig. 3 is a top view of a first color resist layer in a display panel according to an embodiment of the present disclosure;

FIG. 4 is a top view of a second color-resist layer in a display panel according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram illustrating another top view of a second color-resist layer in a display panel according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram illustrating another top view of a second color-resist layer in a display panel according to an embodiment of the present disclosure;

FIG. 7 is a cross-sectional view taken along line B-B of the display panel of FIG. 1;

FIG. 8 is a cross-sectional view of the display panel shown in FIG. 1;

FIG. 9 is a cross-sectional view of another display panel provided in the embodiment of FIG. 1, taken along line C-C;

FIG. 10 is a cross-sectional view of another display panel provided in the embodiment of FIG. 1, taken along line C-C;

fig. 11 is a diagram illustrating an equivalent circuit structure of a fingerprint identification unit according to an embodiment of the present application;

FIG. 12 is a cross-sectional view of another display panel provided in the embodiment of FIG. 1, taken along line C-C;

fig. 13 is a cross-sectional view of a liquid crystal display panel according to an embodiment of the present disclosure;

fig. 14 is a cross-sectional view of an organic electroluminescent display panel according to an embodiment of the present disclosure;

fig. 15 is a top view of another display panel provided in the embodiment of the present application;

fig. 16 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result. Furthermore, the term "coupled" is intended to encompass any direct or indirect electrical coupling. Thus, if a first device couples to a second device, that connection may be through a direct electrical coupling or through an indirect electrical coupling via other devices and couplings. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.

Referring to fig. 1, which is a top view of a display panel provided in an embodiment of the present application, fig. 2 is an a-a cross-sectional view of the display panel provided in the embodiment of fig. 1, the display panel 300 is provided with a display area 10 and a non-display area 20, the display area 10 includes a main display area 11 and an auxiliary display area 12, the display panel 300 is further provided with at least one fingerprint identification unit 30, and a forward projection of the fingerprint identification unit 30 on a plane where the display panel 300 is located on the auxiliary display area 12;

with reference to fig. 2, the main display area 11 is provided with a plurality of first pixel regions 41 arranged in an array, each first pixel region 41 is provided with a first color resist layer 541, the auxiliary display area 12 is provided with a plurality of second pixel regions 42 arranged in an array, each second pixel region 42 is provided with a second color resist layer 542, and the transmittance of the first color resist layer 541 is smaller than that of the second color resist layer 542.

Referring to fig. 1, the display panel 300 in this embodiment is a conventional rectangular structure, the non-display area 20 is disposed around the display area 10, and at the viewing angle shown in fig. 1, the auxiliary display area 12 is located at the bottom side of the main display area 11, the main display area 11 has a larger area to play a main information display role, and the auxiliary display area 12 has a smaller area to play a basic auxiliary role in displaying the display area 10. In some embodiments, the secondary display area 12 may include, for example, a key area, and several key symbols are displayed for user operation. In this embodiment, the orthogonal projection of the fingerprint identification unit 30 on the plane where the display panel 300 is located in the auxiliary display area 12, because the display effect of the main display area 11 can directly affect the display effect of the display panel 300, and the display effect of the auxiliary display area 12 does not greatly affect the overall display effect of the display panel 300, when the fingerprint identification unit 30 is disposed in the auxiliary display area 12, the display effect of the main display area 11 is not affected even if the brightness of the auxiliary display area 12 is reduced to some extent after the fingerprint identification unit 30 is introduced, and therefore the overall display effect of the display panel 300 is not greatly affected. In addition, referring to fig. 1, a plurality of first pixel regions 41 are disposed in the main display region 11, a second pixel region 42 is disposed in the auxiliary display region 12, and with reference to fig. 2, under an observation angle of fig. 2, the display panel 300 sequentially includes, from bottom to top, a backlight module 51, a lower polarizer 52, an array substrate 53, a fingerprint identification unit 30, a color resistance layer 54, an upper polarizer 55, and a cover glass 56, the color resistance layer 54 includes a first color resistance layer 541 disposed corresponding to the first pixel regions 41 and a second color resistance layer 542 disposed corresponding to the second pixel regions 42, the backlight module 51 provides a light source for fingerprint identification, and light emitted by the backlight module 51 is reflected by the touch body 57 and reaches the fingerprint identification unit 30.

The fingerprint identification unit 30 is introduced to realize the fingerprint identification function of the display panel. In the process of fingerprint identification, light reflected by the touch subject (finger fingerprint) is irradiated onto the photosensitive surface of the fingerprint identification unit, and the fingerprint identification unit 30 detects the fingerprint according to the intensity of the reflected light, and the greater the intensity of the reflected light, the more accurate the fingerprint identification process. The touch body is composed of a series of ridges and valleys on the surface of the finger tip skin, and the intensity of light reflected by the ridges and valleys received by the fingerprint recognition unit 30 is different, so that the magnitude of current/voltage signals converted from the reflected light formed at the positions of the ridges and the reflected light formed at the positions of the valleys is different, and then fingerprint recognition can be performed according to the magnitude of the current/voltage signals.

In general, transmittance is an important technical indicator in the display technology field, and represents the ability of light to transmit through a medium, and is the percentage of the luminous flux transmitted through a transparent or translucent body to the luminous flux incident thereon. The larger the penetration rate is, the better the light transmission is, and the higher the brightness is under the condition that the brightness of the backlight module is consistent. The transmittance is generally related to the properties of the medium, which directly affect light reflection, light absorption and light scattering, wherein light reflection refers to the fact that light rays are reflected from the surface of the medium to cause the transmittance to be reduced; the light absorption means that when light enters the medium material, due to the molecular structure and composition, the light is blocked in the channel and is retained in the material to be absorbed, so that the penetration rate is reduced; light scattering refers to the fact that when light contacts a rough and uneven medium surface or a material with a non-uniform or disordered molecular structure, incident light rays are not transmitted, reflected and absorbed, but dissipated in a scattering mode, and accordingly the transmittance is reduced. In the embodiment of the present application, the transmittance of the second color resist layer 542 located in the auxiliary display area 12 is greater than the transmittance of the first color resist layer 541 located in the main display area 11, because the fingerprint identification unit 30 is located in the auxiliary display area 12 with a higher transmittance, when the luminance of the backlight module is consistent, the higher the transmittance is, more light is reflected to the fingerprint identification unit 30 in the light reflected by the touch main body, the amount of light received by the fingerprint identification unit 30 will also be increased, so that the intensity of the light signal sensed by the fingerprint identification unit 30 is also greater, thereby being beneficial to improving the accuracy of fingerprint identification.

In addition, because when backlight unit luminance is unanimous, the higher luminance that the penetration rate is also big more, when fingerprint identification unit 30 has been introduced in the higher supplementary display area 12 of penetration rate, fingerprint identification unit 30 even can reduce the penetration rate of supplementary display area 12 to a certain extent, because the penetration rate of supplementary display area 12 is higher relatively before introducing, consequently, can compensate the influence that the introduction of fingerprint identification unit 30 caused the penetration rate of supplementary display area 12, can effectively reduce the display brightness difference between supplementary display area 12 and the main display area 11, thereby be favorable to promoting display panel 300's whole display effect.

It should be noted that the embodiment shown in fig. 1 of the present application only schematically shows one structure of the display panel 300, and besides the rectangular structure, the display panel 300 may also have an irregular structure such as a circle, an ellipse, and the like, which is not specifically limited in the present application. In addition, the embodiment shown in fig. 1 also only schematically shows one relative position relationship between the main display area 11 and the auxiliary display area 12, and other relative position relationships may be adopted between the two areas, which is not specifically limited in this application. In addition, the number and the structure of the auxiliary display areas 12 are not specifically limited in the embodiment of the application, and the auxiliary display areas can be flexibly set according to actual needs in the actual application process. The number and size of the pixel regions in the embodiment shown in fig. 1 are only schematic and do not represent actual size and number, and the number of the pixel regions corresponding to the main display region 11 and the auxiliary display region 12 is also schematic and does not represent actual number.

It should be noted that the cross-sectional view shown in fig. 2 only schematically shows the relative positions of the film layers, and does not cover the detailed film layers, and the display panel 300 further includes other film layers besides these film layers, which are not shown in detail here.

Optionally, the first color resist layer 541 in the embodiment shown in fig. 2 includes a plurality of first color resist units 61 as shown in fig. 3, where the first color resist units 61 include a red color resist 71, a green color resist 72, and a blue color resist 73; the second color resistance layer 542 in the embodiment shown in fig. 2 includes a plurality of second color resistance units 62 shown in fig. 4, and the second color resistance units 62 include a red color resistance 71, a green color resistance 72, a blue color resistance 73, and a white color resistance 74, where fig. 3 is a top view of the first color resistance layer in the display panel provided in the embodiment of the present application, and fig. 4 is a top view of the second color resistance layer in the display panel provided in the embodiment of the present application.

Specifically, with reference to fig. 2 to 4, in the second color resistance unit 62 in the second color resistance layer 542 in the auxiliary display area 12, besides the red color resistance 71, the green color resistance 72, and the blue color resistance 73, the white color resistance 74 is also introduced, and since the transmittance of the white color resistance 74 is higher than that of the red color resistance 71, the green color resistance 72, and the blue color resistance 73, after the white color resistance 74 is introduced, the transmittance of each second color resistance unit 62 is improved, and thus the transmittance of the second color resistance layer 542 is improved together. The first color resistance unit 61 in the main display area 11 only includes the red color resistance 71, the green color resistance 72, and the blue color resistance 73, so that the transmittance of the first color resistance unit 61 is lower than that of the second color resistance unit 62, and therefore, the transmittance of the second color resistance layer 542 is greater than that of the first color resistance layer 541 by introducing the white color resistance 74 into the second color resistance unit 62, that is, the transmittance of the auxiliary display area 12 is greater than that of the main display area 11, so that the fingerprint identification unit 30 can receive more light reflected by the touch subject, and the intensity of the light signal sensed by the fingerprint identification unit 30 is greater, thereby facilitating the improvement of the accuracy of fingerprint identification; in addition, after the white color resist 74 is introduced on the basis of the red color resist 71, the green color resist 72 and the blue color resist 73, the display panel can also display a brighter color picture; moreover, even after the fingerprint identification unit 30 is introduced into the auxiliary display area 12, the influence of the introduction of the fingerprint identification unit 30 on the transmittance of the auxiliary display area 12 can be compensated, and the brightness difference between the auxiliary display area 12 and the main display area 11 is reduced, thereby being beneficial to improving the overall display effect of the display panel 300.

Optionally, the first color resist layer 541 in the embodiment shown in fig. 2 includes a plurality of first color resist units 61, each of the first color resist units 61 includes a red color resist 71, a green color resist 72, and a blue color resist 73, and at least a portion of the second color resist layer 542 in the embodiment shown in fig. 2 includes a plurality of third units 63 shown in fig. 5, and color resists are not disposed in the third units 63, where fig. 5 is another top view of the second color resist layer 542 in the display panel 300 provided in this embodiment of the present application.

Specifically, in the embodiment shown in fig. 5, besides a portion of the second color resist units 62 is disposed on the second color resist layer 542, a plurality of third units 63 are disposed, the third units 63 are not disposed with color resists, when color resists are not disposed, transparent film structures can be used for filling, so that most of light can penetrate through the third units 63, introduction of the third units 63 is favorable for greatly increasing the transmittance of light, and thus the transmittance of the second color resist layer 542 is also greatly improved, the fingerprint identification unit 30 can receive more light reflected by the touch object, so that the intensity of the light signal sensed by the fingerprint identification unit 30 is also higher, and thus, the accuracy of fingerprint identification is also favorable for improving. In addition, after the transmittance of the second color resist layer 542 is increased, the defect of loss of the transmittance caused when the fingerprint identification unit 30 is introduced into the auxiliary display area 12 is also compensated, and the brightness difference between the main display area 11 and the auxiliary display area 12 is reduced. In the embodiment shown in fig. 5, the third unit 63 is introduced into the second color resist 542, and during the process of displaying in the auxiliary display area 12, the position corresponding to the third unit 63 will display a black-and-white picture, while the position corresponding to the second color resist 62 can still display a color picture, which is enough to meet the display requirement of the auxiliary display area 12. It should be noted that, in order to improve the uniformity of the display screen in the auxiliary display area, the introduced third units 63 are further uniformly distributed in the auxiliary display area.

In addition to the implementation of the second color resist layer 542 in the display panel 300 provided in the embodiment of the present application by using the method shown in fig. 5, fig. 6 shows another top view of the second color resist layer in the display panel provided in the embodiment of the present application, in the embodiment shown in fig. 6, the second color resist layer 542 is completely configured as the third unit 63, that is, no color resist is completely disposed on the second color resist layer 542, such a method can greatly increase the transmittance of the light of the second color resist layer 542, and is more favorable for improving the amount of the light reflected by the touch subject that can be received by the fingerprint identification unit 30, so that the intensity of the light signal sensed by the fingerprint identification unit 30 is higher, and is more favorable for improving the accuracy of fingerprint identification. . It should be noted that, when the second color resist 542 is set as the third unit 63, the auxiliary display area 12 only presents a black-and-white picture in the displaying process, and since the display requirement of the display panel 300 on the auxiliary display area 12 is not high, the basic auxiliary display function can be implemented, so that when the auxiliary display area 12 only presents a black-and-white picture, the whole display effect of the display panel 300 is not affected.

Optionally, in the embodiment shown in fig. 1 of the present application, the fingerprint identification unit 30 introduced into the auxiliary display area 12 includes a plurality of fingerprint identification sensors, and the fingerprint identification sensors are photoelectric sensing type fingerprint identification sensors. Photoelectric sensing formula fingerprint identification sensor is used for carrying out fingerprint identification according to the light that the touch subject reflects, when receiving light signal, thereby can convert light signal into the signal of telecommunication and realize fingerprint identification.

Fig. 7 is a B-B cross-sectional view of the display panel provided in the embodiment of fig. 1, fig. 8 is a C-C cross-sectional view of the display panel provided in the embodiment of fig. 1, and with reference to fig. 7 and fig. 8, the display panel includes a first substrate 301, the first substrate 301 includes a first base 110 and a thin film transistor array layer 111 sequentially disposed, and the thin film transistor array layer 111 includes a semiconductor active layer 112, a gate metal layer 113, and a source drain metal layer 114 disposed in an insulating manner. A light shielding layer 115 is further disposed between the first substrate 110 and the semiconductor active layer, an orthographic projection of the light shielding layer 115 on a plane where the first substrate 110 is located overlaps with an orthographic projection of a channel region in the thin film transistor array layer, and the channel region can generate a photogenerated carrier when being illuminated. It should be noted that, in the embodiment shown in fig. 8, the thin film transistor array layer 111 adopts a top gate structure, that is, the gate metal layer 113 is located on the semiconductor active layer 112 away from the first substrate 110; in addition to this structure, the thin film transistor array layer 111 may also adopt a bottom gate structure, and the gate metal layer 113 is disposed on a side of the semiconductor active layer 112 close to the first substrate 110, which is not particularly limited in this application.

Alternatively, referring to fig. 8, the photo-sensing type fingerprint recognition sensor 31 includes a P-type semiconductor layer 311, an intrinsic semiconductor layer 312, and an N-type semiconductor layer 313, and the N-type semiconductor layer 313 is disposed at the same layer as the semiconductor active layer 112 in the embodiment shown in fig. 7. The P-type semiconductor layer 311, the intrinsic semiconductor layer 312, and the N-type semiconductor layer 313 are made of silicon, boron ions are doped in the P-type semiconductor layer 311, phosphorus ions are doped in the N-type semiconductor layer 313, and the intrinsic semiconductor layer 312 is not doped with ions or is doped with low-level ions.

Specifically, the photo-sensing fingerprint sensor 31 in the embodiment shown in fig. 8 is embodied as a PIN photodiode, and the PIN photodiode is formed by adding a low-doped or undoped Intrinsic (Intrinsic) semiconductor layer 312 between a P-type semiconductor layer 311 and an N-type semiconductor layer 313, wherein the P-type semiconductor layer 311 is doped with P-type impurities, the N-type semiconductor layer 313 is doped with N-type impurities, and both the P-type semiconductor layer 311 and the N-type semiconductor layer 313 can be doped by ion implantation. The intrinsic semiconductor layer 312 approximates a medium, which is sensitive to light, for receiving light reflected by the touch subject; when the intrinsic semiconductor layer 312 is introduced between the P-type semiconductor layer 311 and the N-type semiconductor layer 313, the distance between the two electrodes of the P-N junction capacitance is increased, so that the junction capacitance becomes small. The widths of the depletion layers in the P-type semiconductor layer 311 and the N-type semiconductor layer 313 are widened as the reverse bias increases, and the junction capacitance becomes small as the reverse bias increases. When a reverse bias is applied to the PIN photodiode, when light reflected via the touch subject enters the photo recognition sensor, incident photons are absorbed by the intrinsic semiconductor layer 312, since the reverse bias voltage between the P-type semiconductor layer 311 and the N-type semiconductor layer 313 is mainly concentrated on the intrinsic semiconductor layer 312, a high electric field region is formed in the intrinsic semiconductor layer 312, and the photo-generated carriers in the intrinsic semiconductor layer 312 accelerate under the action of a strong electric field, so that the conversion from optical signals to electrical signals is realized, in the fingerprint recognition process, since the intensities of the light reflected by the ridges and valleys of the touch subject received by the fingerprint recognition unit 30 are different, the sizes of current/voltage signals converted from the reflected light formed at the ridge position and the reflected light formed at the valley position are different, and then fingerprint identification can be performed according to the sizes of the current/voltage signals. Since the semiconductor active layer 112 in the thin film transistor array layer 111 is also doped N-type, the N-type semiconductor layer 313 in the photoelectric sensing type fingerprint sensor 31 can be reused as the semiconductor active layer 112 in fig. 7, and the doping process of the N-type impurity in the semiconductor active layer 313 and the N-type impurity in the photoelectric sensing type fingerprint sensor can be completed in the same manufacturing process without separately providing an additional film layer structure for the N-type semiconductor layer 313, thereby being beneficial to saving the production flow of the display panel 300 and improving the production efficiency.

Alternatively, the structure of each film layer in the photo-sensing type fingerprint recognition sensor 31 may be implemented in the form shown in fig. 8, in which the intrinsic semiconductor layer 312 and the P-type semiconductor layer 311 are disposed at the same layer as the semiconductor active layer 112, and the intrinsic semiconductor layer 312 is disposed between the P-type semiconductor layer 311 and the N-type semiconductor layer 313. The PIN diode having such a structure has a planar structure in which the doping concentrations of the P-type semiconductor layer 311 and the N-type semiconductor layer 313 are generally high, and the intrinsic semiconductor layer 312 is undoped or lowly doped. When the P-type semiconductor layer 311, the intrinsic semiconductor layer 312 and the N-type semiconductor layer 313 are all disposed at the same layer as the semiconductor active layer 112, the PIN diode can be conveniently manufactured by adopting a conventional planar process, which is beneficial to simplifying the production process and the later-stage impurity doping manufacturing process, when the N-type impurity is doped, the positions corresponding to the P-type semiconductor layer 311 and the intrinsic semiconductor layer 312 can be shielded, then, N-type impurity ion implantation is carried out on the film layer corresponding to the N-type semiconductor layer 313, after N-type impurity doping is completed, then, the positions corresponding to the intrinsic semiconductor layer 312 and the N-type semiconductor layer 313 are shielded, then, P-type impurity ion implantation is performed on the film layer corresponding to the P-type semiconductor layer 311, and the film layer corresponding to the intrinsic semiconductor layer 312 may be lightly doped or undoped, thereby completing the fabrication of the PIN diode.

Alternatively, the structure of the PIN diode may also adopt other structures besides the structure shown in fig. 8, for example, fig. 9 is a C-C cross-sectional view of the display panel provided in the embodiment of fig. 1 shown in fig. 9, and with reference to fig. 7 and 9, the intrinsic semiconductor layer 312 is disposed on the same layer as the semiconductor active layer 112, and the P-type semiconductor layer 311 is disposed between the intrinsic semiconductor layer 312 and the source/drain metal layer 114. In this embodiment, the intrinsic semiconductor layer 312 and the N-type semiconductor layer 313 are both disposed on the same layer as the semiconductor active layer 112, the P-type semiconductor layer 311 is located on a side of the intrinsic semiconductor layer 312 away from the first substrate 110, and an orthogonal projection of the P-type semiconductor layer 311 on a plane where the display panel 300 is located overlaps an orthogonal projection of the intrinsic semiconductor layer 312 on a plane where the display panel 300 is located, and does not overlap an orthogonal projection of the N-type semiconductor layer 313 on a plane where the display panel 300 is located.

Alternatively, the structure of the PIN diode may also be formed by using the structure shown in fig. 10, where fig. 10 is another C-C cross-sectional view of the display panel 300 provided in the embodiment of fig. 1, and in combination with fig. 7 and fig. 10, the intrinsic semiconductor layer 312 and the P-type semiconductor layer 311 are located between the semiconductor active layer 112 and the source/drain metal layer 114; the intrinsic semiconductor layer 312 and the P-type semiconductor layer 311 are sequentially disposed in a direction perpendicular to the plane of the display panel 300, and the P-type semiconductor layer 311 is located on a side of the intrinsic semiconductor layer 312 away from the semiconductor active layer 112. Specifically, in the embodiment shown in fig. 10, the P-type semiconductor layer 311, the intrinsic semiconductor layer 312, and the N-type semiconductor layer 313 are located on different film layers, the intrinsic semiconductor layer 312 isolates the P-type semiconductor layer 311 from the N-type semiconductor layer 313 to form a PIN diode with a mesa structure, and the PIN diode with such a structure can also convert an optical signal into an electrical signal to realize a fingerprint identification function.

Fig. 11 is a diagram illustrating an equivalent circuit structure of a fingerprint identification unit according to an embodiment of the present disclosure, where the fingerprint identification unit 30 includes fingerprint identification sensors 31 shown in fig. 11, the fingerprint identification sensors 31 are arranged in an array, the fingerprint identification unit 30 further includes a plurality of first thin film transistors 32 shown in fig. 11, the plurality of first gate lines 33 extending along a first direction and arranged along a second direction, and a plurality of first data lines 34 extending along the second direction and arranged along the first direction, and the first direction intersects the second direction;

the gates of the first thin film transistors 32 arranged along the first direction are connected to the same first gate line 33, the first poles of the first thin film transistors 32 arranged along the second direction are connected to the same first data signal line, and the second poles of the first thin film transistors 32 are electrically connected to the fingerprint recognition sensors 31 in a one-to-one correspondence manner.

Specifically, with continued reference to fig. 11, the first gate lines 33 are used for sending a gating signal to the first thin film transistors 32 row by row, turning on the corresponding first thin film transistors 32, scanning the corresponding fingerprint identification sensors 31 row by row, and providing a reverse bias voltage to the fingerprint identification sensors 31; when a certain or some fingerprint identification sensor 31 receives the light reflected by the touch main body, the light signal can be converted into an electric signal under the action of reverse bias voltage, as can be seen from fig. 11, the fingerprint identification unit 30 further comprises a capacitor 35, the capacitor 35 is connected in parallel with the fingerprint identification sensor 31, the capacitance value is the same as that of the fingerprint identification sensor 31, the capacitance value of the capacitor 35 can be detected through a first data line 34, so as to detect the distribution situation of fingerprint valleys and ridges, the fingerprint valley light leakage current is large, the capacitance value is small, the fingerprint ridge light leakage current is small, the capacitance value is large, and further the fingerprint identification function is realized.

Optionally, fig. 12 is another C-C cross-sectional view of the display panel provided in the embodiment of fig. 1, and referring to fig. 7, fig. 11 and fig. 12, the first gate line 33 in the fingerprint identification unit 30 is disposed in the same layer as the gate metal layer 113 in the thin film transistor array layer 111, the first data line 34 is disposed in the same layer as the source/drain metal layer 114, and the second poles of the first thin film transistors 32 are electrically connected to the P-type semiconductor layers 311 in the fingerprint identification sensor 31 in a one-to-one correspondence manner. That is to say, the film structures of the first thin film transistors 32 in the fingerprint identification unit 30 are in one-to-one correspondence with the film structures of the thin film transistor array layers 111 corresponding to the pixels on the display panel 300, and the film layers are directly utilized to form the first thin film transistors 32 of the fingerprint identification unit 30 on the basis of the existing thin film transistor array layers 111, so that a process of independently setting the film layers for the first thin film transistors 32 in the fingerprint identification unit 30 is avoided, and meanwhile, a phenomenon that the thickness of the display panel 300 is increased due to the introduction of new film layers is also avoided. In addition, the second pole of the first thin film transistor 32 is electrically connected to the P-type semiconductor layer 311 of the fingerprint sensor 31 in a one-to-one correspondence, and the second pole can provide a reverse bias voltage required for operation to the fingerprint sensor 31, so that the fingerprint function can be realized when light reflected by the touch subject is received.

Optionally, the display panel 300 provided in the embodiment of the present application is a liquid crystal display panel or an organic electroluminescence display panel.

Specifically, when the display panel 300 in the embodiment of the present application is embodied as a liquid crystal display panel, the structure of the display panel is shown in fig. 13, and fig. 13 is a cross-sectional view of the display panel provided in the embodiment of the present application when the display panel is a liquid crystal display panel, and the display panel includes an array substrate 100 and a color filter substrate 200 that are oppositely disposed, and a liquid crystal 201 filled in the array substrate 100 and the color filter substrate 200, wherein a fingerprint identification unit is integrated on the array substrate 100, a first color resist layer and a second color resist layer are respectively disposed on the color filter substrate 200, and color resists of different colors on the first color resist layer and the second color resist layer are respectively formed by pigments of different colors. When the color resist is not provided, it is sufficient to fill a transparent material in the position where the pigment is filled.

When the display panel 300 in the embodiment of the present application is embodied as an organic electroluminescent display panel, structure referring to fig. 14, fig. 14 is a cross-sectional view of an organic electroluminescent display panel according to an embodiment of the present disclosure, which includes a driving function layer 81, an organic light emitting material layer 82, an encapsulation layer 83, and the like, wherein, the fingerprint identification unit is integrated on the driving function layer 81, the first color resistance layer and the second color resistance layer respectively correspond to the organic light emitting material layer 82, the organic light emitting material layer 82 comprises an anode layer 821, a pixel defining layer 822, an organic light emitting material 823 and a cathode layer 824 which are sequentially arranged, the color resistances of different colors respectively correspond to the organic light emitting materials 823 of different colors, when the color resistor is not arranged, the organic luminescent material is not filled in the part corresponding to the organic luminescent material, but the transparent film layer is filled, and at the moment, the corresponding area can display white light.

It should be noted that in the embodiment shown in fig. 1, an area of a forward projection of the fingerprint identification unit 30 on a plane where the display panel is located is smaller than an area of the auxiliary display area 12, that is, the fingerprint identification unit 30 is located in a local area of the auxiliary display area 12, and the fingerprint identification unit is located in a middle position of the auxiliary display area 12 in fig. 1, and may be located in any other position of the auxiliary display area, which is not specifically limited in this application. In addition to this way, fig. 15 shows another top view of the display panel provided in the embodiment of the present application, referring to fig. 15, in this embodiment, the fingerprint identification unit 30 covers the auxiliary display area 12 in the orthographic projection of the plane where the display panel is located, that is, the fingerprint identification unit 30 is disposed in the range defined by the whole auxiliary display area 12, and the user can realize fingerprint identification at any position of the auxiliary display area 12, so that the fingerprint identification operation of the user is facilitated, and the experience effect of the user is effectively improved.

Based on the same inventive concept, the present application further provides a display device 400, and fig. 16 is a schematic structural diagram of the display device provided in the embodiment of the present application, and referring to fig. 16, the display device 400 includes the display panel 300 in the present application. It should be noted that the display device 400 provided in the embodiment of the present application may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. In the present application, the embodiment of the display device 400 can refer to the embodiment of the display panel 300, and repeated descriptions are omitted here.

According to the embodiments, the application has the following beneficial effects:

in display panel and display device that this application embodiment provided, the display area includes main display area and supplementary display area, the transmissivity that is located the second colour of supplementary display area hinders the layer is greater than the transmissivity that is located the first colour of main display area hinders the layer, because the fingerprint identification unit is located the higher supplementary display area of transmissivity, when backlight unit luminance is unanimous, the transmissivity is higher, will have more light reflection to the fingerprint identification unit in the light of touching the main part reflection, the light volume that the fingerprint identification unit received also will increase, so make the light signal intensity that the fingerprint identification unit experienced also bigger, consequently, be favorable to promoting fingerprint identification's accuracy. In addition, as the main display area plays a main display function, the fingerprint identification unit is arranged in the auxiliary display area, the display effect of the main display area cannot be influenced even if the brightness of the auxiliary display area is reduced to some extent, and the influence on the whole display effect of the display panel is small; in addition, the penetration rate of the second color resistance layer positioned in the auxiliary display area is greater than the penetration rate of the first color resistance layer positioned in the main display area, and even if the fingerprint identification unit is introduced into the auxiliary display area, the display brightness difference between the auxiliary display area and the main display area can be effectively reduced, so that the display effect of the display panel and the display device is favorably improved.

The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.

Claims

1. A display panel is provided with a display area and a non-display area and is characterized in that the display area comprises a main display area and an auxiliary display area, the display panel is also provided with at least one fingerprint identification unit, and the orthographic projection of the fingerprint identification unit on the plane where the display panel is located in the auxiliary display area; the fingerprint identification unit comprises a plurality of fingerprint identification sensors, and the fingerprint identification sensors are photoelectric induction type fingerprint identification sensors; the photoelectric induction type fingerprint identification sensor comprises a P-type semiconductor layer, an intrinsic semiconductor layer and an N-type semiconductor layer, wherein at least two of the P-type semiconductor layer, the intrinsic semiconductor layer and the N-type semiconductor layer are arranged along the direction vertical to the light-emitting surface of the display panel;

the main display area is provided with a plurality of first pixel areas which are arranged in an array, each first pixel area is provided with a first color resistance layer, the auxiliary display area is provided with a plurality of second pixel areas which are arranged in an array, each second pixel area is provided with a second color resistance layer, and the penetration rate of the first color resistance layer is smaller than that of the second color resistance layer;

the display panel comprises a first substrate, wherein the first substrate comprises a first substrate and a thin film transistor array layer which are sequentially arranged, and the thin film transistor array layer comprises a semiconductor active layer, a grid metal layer and a source drain metal layer which are arranged in an insulating mode;

at least the N-type semiconductor layer and the semiconductor active layer are arranged on the same layer.

2. The display panel according to claim 1, wherein the first color resist layer comprises a plurality of first color resist units, and the first color resist units comprise a red color resist, a green color resist, and a blue color resist; the second color resistance layer comprises a plurality of second color resistance units, and the second color resistance units comprise a red color resistance, a green color resistance, a blue color resistance and a white color resistance.

3. The display panel according to claim 1, wherein the first color resist layer comprises a plurality of first color resist units, the first color resist units comprise a red color resist, a green color resist and a blue color resist, and at least a part of the second color resist layer comprises a plurality of third units, and the third units are not provided with color resists.

4. The display panel according to claim 1, wherein the intrinsic semiconductor layer and the semiconductor active layer are disposed on a same layer, and the P-type semiconductor layer is located between the intrinsic semiconductor layer and the source/drain metal layer.

5. The display panel according to claim 1, wherein the intrinsic semiconductor layer and the P-type semiconductor layer are located between the semiconductor active layer and the source-drain metal layer;

the intrinsic semiconductor layer and the P-type semiconductor layer are sequentially arranged in a direction perpendicular to the plane where the display panel is located, and the P-type semiconductor layer is located on one side, away from the semiconductor active layer, of the intrinsic semiconductor layer.

6. The display panel according to any one of claims 4 to 5, wherein the fingerprint sensor is arranged in an array, the fingerprint sensor unit further comprises a plurality of first thin film transistors arranged in an array, a plurality of first gate lines extending in a first direction and arranged in a second direction, and a plurality of first data signal lines extending in the second direction and arranged in the first direction, the first direction and the second direction intersecting;

the grid electrodes of the first thin film transistors arranged along the first direction are connected with the same first grid line, the first poles of the first thin film transistors arranged along the second direction are connected with the same first data signal line, and the second poles of the first thin film transistors are respectively and correspondingly electrically connected with the fingerprint identification sensors.

7. The display panel according to claim 6, wherein the first gate line and the gate metal layer are disposed on the same layer, the first data signal line and the source/drain metal layer are disposed on the same layer, and the second electrodes of the first thin film transistors are electrically connected to the P-type semiconductor layers in the fingerprint sensor in a one-to-one correspondence manner.

8. The display panel of claim 1, wherein the secondary display area comprises a key area.

9. The display panel according to claim 1, wherein the display panel is a liquid crystal display panel or an organic electroluminescence display panel.

10. The display panel according to claim 1, wherein the orthographic projection of the fingerprint identification unit on the plane of the display panel covers the auxiliary display area.

11. A display device comprising the display panel according to any one of claims 1 to 10.