CN110909720A - Color film substrate, display panel and display device - Google Patents
Color film substrate, display panel and display device Download PDFInfo
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- CN110909720A CN110909720A CN201911310931.0A CN201911310931A CN110909720A CN 110909720 A CN110909720 A CN 110909720A CN 201911310931 A CN201911310931 A CN 201911310931A CN 110909720 A CN110909720 A CN 110909720A
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/147—Details of sensors, e.g. sensor lenses
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- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
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Abstract
The invention discloses a color film substrate, a display panel and a display device, wherein the color film substrate comprises: the device comprises a substrate, a transparent dielectric layer, a photosensitive detection layer and a filter layer; a filter layer, comprising: the shading units are positioned between the color film units; a photosensitive detection layer comprising: a plurality of photosensitive detection units; a transparent dielectric layer comprising: the medium units are respectively in one-to-one correspondence with the photosensitive detection units; the refractive index of the transparent medium layer is smaller than that of the substrate; the orthographic projection of the medium unit and the orthographic projection of the photosensitive detection unit have an overlapping area; the orthographic projections of the photosensitive detection unit and the medium unit are not overlapped with the color film units. Through set up transparent dielectric layer between photosensitive detection layer and substrate base plate, can accurate control the effective radiation scope of pointolite, can light a plurality of mutual noninterference's pointolites simultaneously at the fingerprint collection in-process, reduce fingerprint collection time, realize the quick collection of fingerprint, improve fingerprint identification's response speed.
Description
Technical Field
The invention relates to the technical field of display, in particular to a color film substrate, a display panel and a display device.
Background
Fingerprint identification provides huge effect in the aspect of protecting personal privacy as a biological identification mode, and electronic products in the market are almost equipped with a fingerprint identification system at present, and for example, automobiles, mobile phones, card punches and the like can have a fingerprint identification function.
In the fingerprint identification in-process, control pointolite outgoing light, can reflect light to display device inside during finger touch screen, detect the light of finger reflection through photosensitive element, gather the fingerprint image of finger, because the outward flange that the fingerprint that corresponds to every point light source like of gathering hardly defines, therefore, in order to avoid the outward flange mutual interference of adjacent pointolite, need light a pointolite collection image once, therefore, need light and gather the process very many times and just can splice out complete fingerprint image, fingerprint collection speed is slow.
Disclosure of Invention
The embodiment of the invention provides a color film substrate, a display panel and a display device, which are used for solving the problem of low fingerprint acquisition speed in the prior art.
In a first aspect, an embodiment of the present invention provides a color film substrate, including: the photosensitive detection device comprises a substrate base plate, a transparent medium layer positioned on the substrate base plate, a photosensitive detection layer positioned on one side of the transparent medium layer, which is far away from the substrate base plate, and a filter layer positioned on one side of the photosensitive detection layer, which is far away from the substrate base plate;
the filter layer includes: the shading units are positioned between the color film units;
the photosensitive detection layer includes: a plurality of photosensitive detection units;
the transparent medium layer comprises: the medium units are respectively in one-to-one correspondence with the photosensitive detection units;
the refractive index of the transparent medium layer is smaller than that of the substrate;
the orthographic projection of the medium unit on the substrate base plate and the orthographic projection of the corresponding photosensitive detection unit on the substrate base plate have an overlapping area;
the orthographic projections of the photosensitive detection units and the transparent medium layers on the substrate base plate are not overlapped with the color film units.
In a possible implementation manner, in the color filter substrate provided in an embodiment of the present invention, the color filter substrate further includes: at least one inorganic film layer positioned between the photosensitive detection unit and the substrate base plate;
the medium unit is positioned between the photosensitive detection unit and the inorganic film layer; or the like, or, alternatively,
the medium unit is positioned between the substrate base plate and the inorganic film layer; or the like, or, alternatively,
the medium unit is positioned between two adjacent inorganic film layers; or the like, or, alternatively,
the orthographic projection of the medium unit on the substrate base plate and the orthographic projection of at least one inorganic film layer on the substrate base plate are not overlapped.
In a possible implementation manner, in the color filter substrate provided in an embodiment of the present invention, the color filter substrate further includes: the photosensitive detection unit comprises a substrate and a plurality of photosensitive detection units, wherein the photosensitive detection units are arranged on the substrate;
a grid electrode insulating layer is arranged between the active layer and the grid electrode of the thin film transistor, and an interlayer insulating layer is arranged between the grid electrode and the drain electrode of the thin film transistor;
the inorganic film layer is the buffer layer, the gate insulating layer or the interlayer insulating layer.
In a possible implementation manner, in the color film substrate provided in the embodiment of the present invention, the refractive index of the transparent dielectric layer is between 1.2 and 1.4.
In a possible implementation manner, in the color film substrate provided in the embodiment of the present invention, the transparent dielectric layer is made of MgF2。
In a possible implementation manner, in the color filter substrate provided in the embodiment of the present invention, an orthogonal projection of the photosensitive detection layer on the substrate and an orthogonal projection of the black matrix layer on the substrate do not overlap each other.
In a second aspect, the present invention also provides a display panel, including: the color film substrate and the array substrate are arranged opposite to the color film substrate.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the display panel includes a plurality of display pixels;
the adjacent N multiplied by N display pixels form a point light source in the fingerprint identification process; n is an integer.
In a possible implementation manner, in the display panel provided by the embodiment of the invention, 0 < nxd ≦ 0.5 mm; d is the side length of each of the display pixels.
In a third aspect, an embodiment of the present invention further provides a display device, including: the display panel is provided.
The invention has the following beneficial effects:
the color film substrate, the display panel and the display device provided by the embodiment of the invention comprise: the photosensitive detection device comprises a substrate base plate, a transparent dielectric layer positioned on the substrate base plate, a photosensitive detection layer positioned on one side of the transparent dielectric layer, which is far away from the substrate base plate, and a filter layer positioned on one side of the photosensitive detection layer, which is far away from the substrate base plate; a filter layer, comprising: the shading units are positioned between the color film units; a photosensitive detection layer comprising: a plurality of photosensitive detection units; a transparent dielectric layer comprising: the medium units are respectively in one-to-one correspondence with the photosensitive detection units; the refractive index of the transparent medium layer is smaller than that of the substrate; the orthographic projection of the medium unit on the substrate base plate and the orthographic projection of the photosensitive detection unit on the substrate base plate have an overlapping area; orthographic projections of the photosensitive detection unit and the medium unit on the substrate base plate are not overlapped with the color film units. According to the color film substrate provided by the embodiment of the invention, the transparent medium layer is arranged between the photosensitive detection layer and the substrate, light reflected by a finger can be firstly emitted to the medium unit and then emitted to the corresponding photosensitive detection unit, and the light larger than the critical angle of total reflection can be totally reflected and cannot be emitted to the photosensitive detection unit because the refractive index of the transparent medium layer is smaller than that of the substrate, so that the effective radiation range of the point light source can be accurately controlled, a plurality of point light sources which are not interfered with each other can be simultaneously lightened in the fingerprint acquisition process, the fingerprint acquisition time is reduced, the rapid fingerprint acquisition is realized, and the response speed of fingerprint identification is improved.
Drawings
FIG. 1 is a schematic diagram of a fingerprint acquisition process;
FIG. 2 is a schematic diagram of an actual fingerprint area and a captured fingerprint image;
FIG. 3 is a schematic diagram of a fingerprint image obtained by simultaneously lighting two point light sources in a display device without a transparent medium layer;
fig. 4 is a schematic structural diagram of a color film substrate according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a fingerprint acquisition process in an implementation of the present invention;
FIG. 7 is a partial schematic view of a fingerprint image obtained without a transparent dielectric layer;
FIG. 8 is a partial schematic view of a fingerprint image obtained by disposing a transparent medium layer according to an embodiment of the present invention;
FIG. 9 is a schematic view of a plurality of fingerprint images obtained without a transparent medium layer;
FIG. 10 is a schematic view of a plurality of fingerprint images obtained by disposing a transparent medium layer;
fig. 11 to 14 are schematic structural diagrams of a color filter substrate according to an embodiment of the present disclosure.
Detailed Description
Fig. 1 is a schematic diagram of a fingerprint capturing process, where S1 represents a plane where a screen is located, S2 represents a plane symmetrical to a photosensitive element with respect to a plane S1, Q represents a point light source, F represents a finger, and the photosensitive element is generally located between the point light source Q and the plane S1, where the plane where the photosensitive element is located and corresponding light rays are mirrored and represented by dotted lines for the sake of more clearly illustrating the fingerprint capturing process, and a point light source Q is lit to capture a fingerprint image in fig. 1 for the sake of more clearly illustrating the fingerprint capturing process. In the fingerprint collection process, control pointolite Q outgoing light, can reflect light to display device inside when finger F touch screen S1, detect the light of finger F reflection through photosensitive element to realize the collection of fingerprint.
Fig. 2 is a schematic diagram of an actual fingerprint region and a captured fingerprint image, where S1 represents an actual fingerprint region obtained by emitting a light beam from a point light source Q to a plane S1, S2 represents a fingerprint image obtained on a plane S2 after the light beam emitted from the point light source Q is reflected by a finger, as can be seen from fig. 2, the fingerprint identification region S1 and the fingerprint image S2 are both annular, the fingerprint image S2 is an enlarged image of the fingerprint region S1, the inner edges of the fingerprint region S1 and the fingerprint image S2 are determined by a total reflection angle between the display device and the air, however, the light beam angle gradually increases from the inner edge to the outer edge, the intensity of the light beam gradually decreases, and therefore, the boundary between the outer edges of the fingerprint region S1 and the fingerprint image S2 is difficult to determine.
In order to avoid the mutual interference of the outer edges of the adjacent point light sources, in the fingerprint acquisition stage, an image needs to be acquired by lighting one point light source every time, so that the complete fingerprint image can be spliced by lighting and acquiring processes for many times, and the fingerprint acquisition speed is low. If more than two point light sources are lighted each time, the outer edges of the fingerprint images collected by the adjacent point light sources interfere with each other, fig. 3 shows the fingerprint images obtained by lighting the two point light sources simultaneously, as shown in fig. 3, the outer edge t of the fingerprint image s2 on the left side interferes with the fingerprint image s2 on the right side, of course, the edge of the fingerprint image s2 on the right side also interferes with the fingerprint image s2 on the left side, in order to clearly show the outer edge t, the outer edge t of the fingerprint image s2 on the right side is omitted in the drawing, and the outer light source t is an area with radiation but no fingerprint image, so that interference can be generated on other fingerprint images.
Aiming at the problem of low fingerprint acquisition speed in the prior art, the embodiment of the invention provides a color film substrate, a display panel and a display device.
Specific embodiments of a color filter substrate, a display panel, and a display device according to embodiments of the present invention are described in detail below with reference to the accompanying drawings. The thicknesses and shapes of the various film layers in the drawings are not to be considered true proportions, but are merely intended to illustrate the present invention.
In a first aspect, an embodiment of the present invention provides a color filter substrate, as shown in fig. 4, including: the device comprises a substrate base plate 10, a transparent medium layer 11 positioned on the substrate base plate 10, a photosensitive detection layer 12 positioned on one side of the transparent medium layer 11, which is far away from the substrate base plate 10, and a filter layer 13 positioned on one side of the photosensitive detection layer 12, which is far away from the substrate base plate 10;
a photosensitive detection layer 12 comprising: a plurality of photosensitive detection units 121;
a transparent dielectric layer 11 comprising: the medium units 111 respectively corresponding to the photosensitive detection units 121 one by one;
the refractive index of the transparent medium layer 11 is smaller than that of the substrate base plate 10;
the orthographic projection of the medium unit 111 on the substrate base plate 10 and the orthographic projection of the photosensitive detection unit 121 on the substrate base plate 10 have an overlapping area;
orthographic projections of the photosensitive detection unit 121 and the medium unit 111 on the substrate 10 do not overlap with the color film units 131.
According to the color film substrate provided by the embodiment of the invention, the transparent medium layer is arranged between the photosensitive detection layer and the substrate, light reflected by a finger can be firstly emitted to the medium unit and then emitted to the corresponding photosensitive detection unit, and the light larger than the critical angle of total reflection can be totally reflected and cannot be emitted to the photosensitive detection unit because the refractive index of the transparent medium layer is smaller than that of the substrate, so that the effective radiation range of the point light source can be accurately controlled, a plurality of point light sources which are not interfered with each other can be simultaneously lightened in the fingerprint acquisition process, the fingerprint acquisition time is reduced, the rapid fingerprint acquisition is realized, and the response speed of fingerprint identification is improved.
The color film substrate provided by the embodiment of the invention can be applied to a liquid crystal display device, and as shown in fig. 5, the display device can include a color film substrate 1, an array substrate 2 arranged opposite to the color film substrate 1, and a backlight module 3 located on one side of the array substrate 2 away from the color film substrate 1. The light emitted by the backlight module 3 passes through the array substrate 2 and each film layer in the color film substrate 1 and then is emitted from the light-emitting surface, and the emitted light is reflected by the finger F and then is emitted to the photosensitive detection layer 12, so that fingerprint identification is realized.
Fig. 6 is a schematic diagram of a fingerprint collection process in an implementation of the present invention, as shown in fig. 6, light emitted from a point light source Q is emitted to a screen surface through each film layer in a display device, i.e., to a plane S1, the refractive index of each film layer in the display device is about 1.5, and it can be considered that the light is transmitted in a medium with a uniform refractive index as a whole, since the refractive index n1 inside the display device is greater than the refractive index n2 of air, when the light is emitted to the plane S1, the light with an incident angle greater than a critical angle of total reflection is totally reflected, and only the light with an incident angle less than the critical angle of total reflection can pass through.
Generally, the critical angle of total reflection between the display device and the air is about 41.8 °, the light emitted from the point light source Q is emitted in a cone shape, the light is transmitted to the interface between the display device and the air, only the light with the incident angle smaller than 41.8 ° will pass through the interface and enter the air, the light with the incident angle larger than 41.8 ° will be totally reflected and emitted into the display device, as shown in fig. 6, the incident angle θ 1 of the light a is larger than 41.8 °, and thus the light a is reflected into the display device at the plane S1.
As shown in fig. 5 and 6, in the embodiment of the present invention, the transparent medium layer 11 is disposed between the substrate 10 and the photosensitive detection layer 12, and after being reflected by the finger F, the light emitted from the point light source Q passes through the medium unit 111 and then emits to the corresponding photosensitive detection unit 121, because the refractive index n3 of the transparent medium layer 11 is smaller than the refractive index n1 of the substrate 10, when the light reflected by the finger F emits to the surface of the transparent medium layer 11, the light having an incident angle larger than the critical angle of total reflection is totally reflected and returns to the medium of the display device, and only the light having an incident angle smaller than the critical angle of total reflection can emit to the photosensitive detection layer 12.
Taking the refractive index of the transparent medium layer 11 as about 1.3 as an example, the critical angle of total reflection occurring on the surface of the transparent medium layer 11 is about 60 °, and among the light rays reflected by the finger F, the light ray with the incident angle larger than 60 ° will be totally reflected and returned to the medium of the display device, for example, the incident angle θ 2 of the light ray c in fig. 6 is larger than or equal to 60 °, so that the light ray c will be totally reflected and returned to the medium of the display device after being reflected by the finger F and cannot be emitted to the photosensitive detection unit 121, and only the light ray with the incident angle smaller than 60 ° can be emitted to the photosensitive detection unit 121, for example, the incident angle of the light ray b in fig. 6 is smaller than 60 °, so that the. In combination with the geometric relationship, of the light emitted from the point light source Q, the light with the emission angle between 41.8 ° and 60 ° can be finally emitted to the photosensitive detection unit 121.
Taking the case that the incident angles of the light ray a and the light ray c in fig. 6 are just equal to the critical angle of total reflection, the area of the fingerprint image is the area shown by L in the figure, and it can be combined with the following fig. 10, where L is the distance between the outer edge and the inner edge of the formed annular fingerprint image.
Therefore, through set up transparent dielectric layer between substrate base plate and photosensitive detection layer, the less light of intensity in the outside of removing the fingerprint like from essence, make the outward flange of fingerprint like more clear, the radiation range of pointolite can be accurate definition promptly, can be through selecting the transparent dielectric layer that has suitable refracting index, screen best fingerprint imaging area, improve fingerprint image concatenation degree of accuracy, can reduce the complexity of follow-up fingerprint image's processing procedure to improve fingerprint identification's response speed.
Fig. 7 is a partial schematic view of a fingerprint image obtained without a transparent medium layer, and fig. 8 is a partial schematic view of a fingerprint image obtained with a transparent medium layer in an embodiment of the present invention. As is apparent from fig. 7, without adding the transparent dielectric layer, the obtained fingerprint has a large imaging range, and the signal intensity of the valleys and ridges in the imaging at the edge position is lower and lower, and the light with a large angle can hardly be recognized by the photosensitive detection layer. Compared with the figure 7, after the transparent medium layer is added in the figure 8, the fingerprint imaging area is reduced, so that interference light rays which do not contain effective fingerprint information are filtered out on the device layer, the complexity of the processing process of subsequent fingerprint images is reduced, the splicing result of the subsequent fingerprint images is more accurate, and the accuracy of fingerprint identification is improved.
Fig. 9 is a schematic view of a plurality of fingerprint images obtained without a transparent medium layer, and fig. 10 is a schematic view of a plurality of fingerprint images obtained with a transparent medium layer, as shown in fig. 9, for a display device without a transparent medium layer, the emergent light of a point light source has no definite radiation range, and in the fingerprint collection process, if two or more point light sources are simultaneously lighted, for example, three point light sources are simultaneously lighted in fig. 9, in order to avoid mutual interference between fingerprint images corresponding to adjacent point light sources, the distance between the point light sources needs to be increased, so that the obtained adjacent fingerprint images have a certain distance.
As shown in fig. 10, for the display device with the transparent medium layer, the light emitted from the point light sources has a certain radiation range, and in the fingerprint collecting process, if two or more point light sources are simultaneously lighted, for example, three point light sources are simultaneously lighted in fig. 10, the point light sources can be arranged in a manner of making the obtained fingerprint images tangent, and compared with the structure without the transparent medium layer, the distance between the adjacent point light sources can be reduced. As can be seen from comparison between fig. 9 and 10, in the same fingerprint identification region W, the area of the fingerprint image s2 effective in the fingerprint identification region W in fig. 10 is larger, and the number of light sources that can be simultaneously lit is larger, so that the fingerprint acquisition time required for the same fingerprint identification region W is shorter, and the response speed of fingerprint identification is improved.
As shown in fig. 4, in the embodiment of the present invention, the filter layer 13 includes a plurality of color film units 131 and a light blocking unit 132, and the color film units 131 can filter light rays within a certain wavelength range and allow light rays within a certain wavelength range to pass through, for example, in fig. 4, a first color film unit 131 can allow light rays of red (R) color to pass through, a second color film unit 131 can allow light rays of green (G) color to pass through, and a third color film unit 131 can allow light rays of blue (B) color to pass through, so as to implement color display. The light shielding units 132 are located between the color film units 131 and are used to separate the color film units 131, so as to prevent crosstalk of light between adjacent color film units 131. Specifically, the display device generally includes a plurality of display pixels, and a plurality of color filter units in the filter layer correspond to the display pixels one to one.
Referring also to fig. 4, each of the dielectric units 111 in the transparent dielectric layer 11 corresponds to each of the photosensitive detection units 121 one by one, and an orthogonal projection of the dielectric unit 111 on the substrate 10 and an orthogonal projection of the photosensitive detection unit 121 on the substrate 10 have an overlapping region, so that light passing through the dielectric unit 111 can be incident on the corresponding photosensitive detection unit 121. In particular, the area of the overlapping region between the medium unit 111 and the photosensitive detection unit 121 may be set in combination with other structures in the display device to ensure that a sufficient area of the fingerprint image can be detected.
In addition, orthographic projections of the photosensitive detection unit 121 and the dielectric unit 111 on the substrate 10 do not overlap with the color film units 131, that is, the photosensitive detection unit 121 and the dielectric unit 111 are disposed in a non-opening area of the display pixel, so that the photosensitive detection unit 121 and the dielectric unit 111 do not affect the normal display effect of the display device. In addition, the medium unit 111 is made of transparent material, and has good light transmittance, so that light can be ensured to pass through the medium unit 111 and be emitted to the corresponding photosensitive detection unit 121.
In specific implementation, as shown in fig. 11 to 14, the color filter substrate provided in the present invention may further include: at least one inorganic film layer (e.g., an interlayer insulating layer 16) between the photosensitive detection unit 121 and the substrate base plate 10;
the media unit 111 may be located between the photosensitive detection unit 121 and the inorganic film layer, for example, in fig. 11, the media unit 111 is located between the photosensitive detection unit 121 and the interlayer insulating layer 16;
or the like, or, alternatively,
the dielectric unit 111 may be located between the substrate base plate 10 and the inorganic film layer, for example, in fig. 12, the dielectric unit 111 is located between the substrate base plate 10 and the buffer layer 14;
or the like, or, alternatively,
the dielectric unit 111 may be located between two adjacent inorganic film layers, for example, in fig. 13, the dielectric unit 111 is located between the buffer layer 14 and the gate insulating layer 15;
or the like, or, alternatively,
the orthographic projection of the dielectric unit 111 on the substrate base plate 10 and the orthographic projection of at least one inorganic film layer on the substrate base plate 10 do not overlap, that is, the dielectric unit 111 can replace part of the inorganic film layer at the corresponding position, for example, in fig. 14, the dielectric unit 111 replaces part of the gate insulating layer 15, so as to reduce the thickness of the device and make the flatness at the position of the photosensitive detection unit 121 better.
Therefore, the dielectric unit 111 can be disposed between a plurality of film layers between the photosensitive detection unit 121 and the substrate base plate 10, or in place of a part of the inorganic film layer, the position of the dielectric unit 111 can be properly set according to actual needs, and is not limited herein.
In addition, as shown in fig. 11 to 14, the color filter substrate provided in the embodiment of the present invention may further include: a plurality of thin film transistors TFT between the photosensitive detection unit 121 and the substrate base plate 10, and a buffer layer 14 between the thin film transistors TFT and the substrate base plate 10;
a gate insulating layer 15 is arranged between the active layer P and the gate G of the thin film transistor TFT, and an interlayer insulating layer 16 is arranged between the gate G and the drain D of the thin film transistor TFT;
the inorganic film layer may be a buffer layer 14, a gate insulating layer 15, or an interlayer insulating layer 16.
In the embodiment of the present invention, taking the structures shown in fig. 11 to fig. 14 as examples, that is, taking the color filter substrate including three layers of inorganic film layers as examples, when implementing the structure specifically, the number of the inorganic film layers may be set according to actual needs, and the positions of the medium units may be reasonably set.
In a specific implementation, as shown in fig. 11 to 14, the photosensitive detection unit 121 may be a photodiode, or may be another photosensitive device, which is not limited herein. One end of the photosensitive detection unit 121 is connected to the drain D of the thin film transistor TFT, and the other end is connected to the signal line R, so that which photosensitive detection unit 121 is controlled to detect through the thin film transistor TFT, and a signal output from the photosensitive detection unit 121 can be detected through the signal line R, thereby realizing fingerprint recognition.
In order to prevent the generation of photogenerated carriers when the active layer P of the thin film transistor TFT is irradiated with light, a light shielding structure LS may be provided between the base substrate 10 and the active layer P. In order to planarize the color filter substrate, a planarization layer 17 may be further provided. In addition, the color filter substrate may further include a first passivation layer 18 and a second passivation layer 19.
Specifically, in the color film substrate provided by the embodiment of the present invention, the refractive index of the transparent dielectric layer may be between 1.2 and 1.4. In general, the refractive index of a medium in a display device is about 1.5, and for example, a substrate may be made of glass having a refractive index of about 1.5, and a transparent medium layer is made of a material having a refractive index of less than 1.5 in order to allow total reflection between the transparent medium layer and the medium of the display device.
More specifically, in the color film substrate provided in the embodiment of the present invention, the material of the transparent dielectric layer may be MgF2。MgF2Has a refractive index of about 1.3, and MgF2Has good light transmittance, so MgF can be selected2And manufacturing the transparent medium layer. In addition, the transparent dielectric layer may also be made of other materials, such as inorganic materials, and may also be made of organic materials, which are not limited herein.
In practical applications, in the color filter substrate provided in the embodiment of the present invention, an orthographic projection of the photosensitive detection layer on the substrate and an orthographic projection of the light shielding unit on the substrate do not overlap with each other, that is, the photosensitive detection layer can replace the light shielding unit at a corresponding position, so as to reduce the thickness of the color filter substrate.
In a second aspect, an embodiment of the present invention further provides a display panel, including the color film substrate and an array substrate disposed opposite to the color film substrate. Because the principle of the display panel for solving the problems is similar to that of the color film substrate, the implementation of the display panel can refer to the implementation of the color film substrate, and repeated details are not repeated.
Specifically, the display panel provided by the embodiment of the present invention may include a plurality of display pixels;
the adjacent NxN display pixels form a point light source in the fingerprint identification process; n is an integer.
Because the light of a display pixel is weak, in order to meet the requirement of fingerprint collection, a plurality of adjacent display pixels can be used as point light sources, the display pixels are controlled to emit light in a time-sharing manner to respectively play the roles of displaying and fingerprint collecting point light sources, specifically, the display pixels can be controlled to emit light respectively in the display time period to display corresponding pictures, in the fingerprint collection time period, a plurality of adjacent display pixels are controlled to be used as a point light source, and the light emission of one or more point light sources is controlled to realize the fingerprint collection operation.
Specifically, Nxd is more than 0 and less than or equal to 0.5 mm; d is the side length of each display pixel, namely the size of the point light source is limited within the range of 0-0.5 mm multiplied by 0.5 mm. In practical application, the number of corresponding pixel units can be determined by combining the sizes of the display pixels, if the sizes of the display pixels are larger, the number of the display pixels corresponding to the point light source is smaller, if the sizes of the display pixels are smaller, the number of the display pixels corresponding to the point light source is larger, the number of the display pixels corresponding to the point light source can be determined according to the actually required sizes of the point light source and the display pixels, and the number of the display pixels corresponding to the point light source is not limited here.
In a third aspect, based on the same inventive concept, an embodiment of the present invention further provides a display device, including the display panel, where the display device may be applied to 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, and a navigator. Since the principle of the display device to solve the problem is similar to that of the display panel, the display device can be implemented by the display panel, and repeated descriptions are omitted.
According to the color film substrate, the display panel and the display device provided by the embodiment of the invention, the transparent medium layer is arranged between the photosensitive detection layer and the substrate, light reflected by a finger can be firstly emitted to the medium unit and then emitted to the corresponding photosensitive detection unit, and the light larger than the critical angle of total reflection can be totally reflected and cannot be emitted into the photosensitive detection unit because the refractive index of the transparent medium layer is smaller than that of the substrate, so that the effective radiation range of a point light source can be accurately controlled, a plurality of non-interfering point light sources can be simultaneously lightened in the fingerprint acquisition process, the fingerprint acquisition time is reduced, the rapid acquisition of fingerprints is realized, and the response speed of fingerprint identification is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A color film substrate is characterized by comprising: the photosensitive detection device comprises a substrate base plate, a transparent medium layer positioned on the substrate base plate, a photosensitive detection layer positioned on one side of the transparent medium layer, which is far away from the substrate base plate, and a filter layer positioned on one side of the photosensitive detection layer, which is far away from the substrate base plate;
the filter layer includes: the shading units are positioned between the color film units;
the photosensitive detection layer includes: a plurality of photosensitive detection units;
the transparent medium layer comprises: the medium units are respectively in one-to-one correspondence with the photosensitive detection units;
the refractive index of the transparent medium layer is smaller than that of the substrate;
the orthographic projection of the medium unit on the substrate base plate and the orthographic projection of the corresponding photosensitive detection unit on the substrate base plate have an overlapping area;
the orthographic projections of the photosensitive detection units and the transparent medium layers on the substrate base plate are not overlapped with the color film units.
2. The color filter substrate of claim 1, further comprising: at least one inorganic film layer positioned between the photosensitive detection unit and the substrate base plate;
the medium unit is positioned between the photosensitive detection unit and the inorganic film layer; or the like, or, alternatively,
the medium unit is positioned between the substrate base plate and the inorganic film layer; or the like, or, alternatively,
the medium unit is positioned between two adjacent inorganic film layers; or the like, or, alternatively,
the orthographic projection of the medium unit on the substrate base plate and the orthographic projection of at least one inorganic film layer on the substrate base plate are not overlapped.
3. The color filter substrate of claim 2, further comprising: the photosensitive detection unit comprises a substrate and a plurality of photosensitive detection units, wherein the photosensitive detection units are arranged on the substrate;
a grid electrode insulating layer is arranged between the active layer and the grid electrode of the thin film transistor, and an interlayer insulating layer is arranged between the grid electrode and the drain electrode of the thin film transistor;
the inorganic film layer is the buffer layer, the gate insulating layer or the interlayer insulating layer.
4. The color film substrate of claim 1, wherein the refractive index of the transparent dielectric layer is between 1.2 and 1.4.
5. The color film substrate of claim 4, wherein the transparent dielectric layer is made of MgF2。
6. The color film substrate according to any one of claims 1 to 5, wherein an orthographic projection of the photosensitive detection layer on the substrate and an orthographic projection of the black matrix layer on the substrate do not overlap with each other.
7. A display panel, comprising: the color filter substrate according to any one of claims 1 to 6, and an array substrate disposed opposite to the color filter substrate.
8. The display panel of claim 7, wherein the display panel comprises a plurality of display pixels;
the adjacent N multiplied by N display pixels form a point light source in the fingerprint identification process; n is an integer.
9. The display panel of claim 8, wherein 0 < nxd ≦ 0.5 mm; d is the side length of each of the display pixels.
10. A display device, comprising: a display panel as claimed in any one of claims 7 to 9.
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