CN109145859A - A kind of display panel, its detection method and display device - Google Patents
A kind of display panel, its detection method and display device Download PDFInfo
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- CN109145859A CN109145859A CN201811025277.4A CN201811025277A CN109145859A CN 109145859 A CN109145859 A CN 109145859A CN 201811025277 A CN201811025277 A CN 201811025277A CN 109145859 A CN109145859 A CN 109145859A
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- 238000004020 luminiscence type Methods 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 10
- 239000010408 film Substances 0.000 description 7
- 238000011896 sensitive detection Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910004205 SiNX Inorganic materials 0.000 description 1
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- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- 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
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
The invention discloses a kind of display panel, its detection method and display device, the display panels, comprising: underlay substrate, the luminescence unit on underlay substrate, the fingerprint identification unit and detection unit of the gap location between adjacent luminescence unit；Wherein, fingerprint identification unit, comprising: collimated light source is located at the photodetector group of collimated light source two sides；The distance of adjacent collimated light source is less than the distance between fingerprint valley and paddy；Each photodetector group in the same fingerprint identification unit is located in same film layer, and each photodetector group includes at least a light-sensitive device；Detection unit is electrically connected with each light-sensitive device, for the electric signal rule according to each light-sensitive device in each fingerprint identification unit, determines the position of fingerprint valley and a ridge.In the display panel, detection unit can determine the position of fingerprint valley and a ridge, so as to realize that fingerprint recognition detects, and detection accuracy is higher according to the electric signal rule of each light-sensitive device.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel, a detection method thereof, and a display device.
Background
With the rapid development of display technologies, electronic devices with biometric functions are gradually entering people's lives and works. Among them, the fingerprint identification technology has uniqueness and stability, and thus becomes one of the most widely used and cheapest identification technologies in the biometric identification technology, and is well appreciated by people, and the application field of fingerprint identification is also becoming more extensive.
In the fingerprint identification technology, the realization mode mainly includes an optical type, a capacitance type, an ultrasonic imaging type and the like, wherein the identification range of the optical fingerprint identification technology is relatively large, the cost is relatively low, however, the existing optical fingerprint identification technology mainly adopts the fact that the reflected light intensity of different areas of fingerprint ridges is different for identification, and the precision is low.
Disclosure of Invention
The embodiment of the invention provides a display panel, a detection method thereof and a display device, which are used for solving the problem of low precision of a fingerprint identification technology in the prior art.
In a first aspect, an embodiment of the present invention provides a display panel including: the fingerprint identification device comprises a substrate base plate, light emitting units, fingerprint identification units and detection units, wherein the light emitting units are positioned on the substrate base plate; wherein,
the fingerprint identification unit comprises: the device comprises a collimation light source and photosensitive detection groups respectively positioned at two sides of the collimation light source;
the distance between the adjacent collimated light sources is smaller than the distance between the fingerprint valleys;
each photosensitive detection group in the same fingerprint identification unit is positioned in the same film layer, and each photosensitive detection group at least comprises a photosensitive device;
the detection unit is electrically connected with each photosensitive device and used for determining the positions of the fingerprint valleys and ridges according to the electrical signal rule of each photosensitive device in each fingerprint identification unit.
In a possible implementation manner, in the display panel provided in an embodiment of the present invention, the collimated light source includes: the light source comprises a first light source, a light guide structure and a reflecting layer, wherein the light guide structure is positioned on one side of a light emitting surface of the first light source;
the first surface is a surface of the light guide structure which is not parallel to the substrate base plate;
in the direction of the light guide structure pointing to the first light source, the cross-sectional area of the light guide structure in the direction parallel to the substrate base plate gradually decreases.
In a possible implementation manner, in the display panel provided in an embodiment of the present invention, the collimated light source further includes: the collimation structure is positioned on one side of the light-emitting surface of the light guide structure;
the collimating structure is composed of a plurality of through holes arranged at equal intervals.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the photosensitive detection group is located on one side of the light incident surface of the collimating structure.
In a possible implementation manner, in the display panel provided in an embodiment of the present invention, the fingerprint recognition reaction further includes: and the shading structure is positioned on one side of the light-emitting surface of the light guide structure and between the collimation structure and the light-emitting unit.
In a possible implementation manner, in the display panel provided in an embodiment of the present invention, the light emitting unit includes: the light-emitting layer is positioned between the anode layer and the cathode layer;
the fingerprint identification unit is positioned in each film layer between the anode layer and the substrate base plate.
In a second aspect, an embodiment of the present invention provides a method for detecting the display panel, including:
each photosensitive device in each fingerprint identification unit outputs an electric signal;
the detection unit determines the positions of the fingerprint valleys and ridges according to the rule of the electric signals output by the photosensitive devices.
In a possible implementation manner, in the detection method provided by the embodiment of the present invention, a distance between the collimated light sources in the adjacent fingerprint identification units is greater than a distance between a fingerprint valley and a ridge and less than a distance between fingerprint valleys;
the detecting unit determines the positions of the fingerprint valley and the ridge according to the rule of the electric signals output by the photosensitive devices, and the detecting unit comprises:
if the detection unit detects that only one photosensitive detection group in the fingerprint identification unit can output an electric signal larger than a first threshold value, the fingerprint identification unit corresponds to the position between the fingerprint valley and the fingerprint ridge.
In a possible implementation manner, in the above detection method provided by the embodiment of the present invention, a distance between the collimated light sources in the adjacent fingerprint identification units is greater than a distance between a valley and a ridge and less than a distance between valleys;
the detecting unit determines the positions of the fingerprint valley and the ridge according to the rule of the electric signals output by the photosensitive devices, and the detecting unit comprises:
if the detection unit detects that two photosensitive detection groups in the fingerprint identification unit can output electric signals which are larger than a first threshold value and smaller than a second threshold value, the fingerprint identification unit corresponds to the position of a fingerprint valley;
if the two photosensitive detection groups in the fingerprint identification unit detected by the detection unit can output electric signals larger than a second threshold value, the fingerprint identification unit corresponds to the position of the fingerprint ridge.
In a third aspect, an embodiment of the present invention provides a display device, including: the display panel is provided.
The invention has the following beneficial effects:
the embodiment of the invention provides a display panel, a detection method thereof and a display device, wherein the display panel comprises the following components: the fingerprint identification device comprises a substrate base plate, light emitting units, a fingerprint identification unit and a detection unit, wherein the light emitting units are positioned on the substrate base plate; wherein, fingerprint identification unit includes: the collimation light source is respectively positioned on the photosensitive detection groups at the two sides of the collimation light source; the distance between adjacent collimated light sources is smaller than the distance between the fingerprint valleys; all photosensitive detection groups in the same fingerprint identification unit are positioned in the same film layer, and each photosensitive detection group at least comprises a photosensitive device; the detection unit is electrically connected with each photosensitive device and is used for determining the positions of the fingerprint valleys and ridges according to the electrical signal rule of each photosensitive device in each fingerprint identification unit. According to the display panel provided by the embodiment of the invention, the fingerprint identification units are arranged at the gaps between the adjacent light-emitting units, and the detection units can determine the positions of the fingerprint valleys and ridges according to the electrical signal rule of each photosensitive device in each fingerprint identification unit, so that fingerprint identification detection can be realized, the detection precision is higher, and the structure is simple.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is an enlarged partial schematic view of FIG. 1;
FIG. 3 is a flowchart illustrating a method for inspecting the display panel according to an embodiment of the present invention;
fig. 4 to 8 are schematic structural diagrams corresponding to the detection method in the embodiment of the invention;
10, a substrate base plate; 11. a display unit; 111. a thin film transistor; 112. an anode layer; 12. a fingerprint recognition unit; 121. a collimated light source; 1211. a first light source; 1212. a light guide structure; 1213. a reflective layer; 1214. a collimating structure; 122. a photosensitive detection group; 1221. a photosensitive device; 123. a light shielding structure; 13. a fingerprint.
Detailed Description
Aiming at the problem that the precision of the fingerprint identification technology in the prior art is low, the embodiment of the invention provides a display panel, a detection method and a display device thereof.
The following describes in detail specific embodiments of a display panel, a detection method thereof, and a display device according to embodiments of the present invention 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 display panel, as shown in fig. 1, including: a substrate base plate 10, light emitting units 11 on the substrate base plate 10, a fingerprint recognition unit 12 at a gap between adjacent light emitting units 11, and a detection unit (not shown in the figure); wherein,
fingerprint identification unit 12, comprising: a collimated light source 121, and photosensitive detection groups 122 respectively located at two sides of the collimated light source 121;
the distance between adjacent collimated light sources 121 is smaller than the distance between fingerprint valleys;
the photosensitive detection groups 122 in the same fingerprint identification unit 12 are located in the same film layer, and each photosensitive detection group 122 at least comprises one photosensitive device 1221;
the detection unit is electrically connected with each photosensitive device 1221 and is used for determining the positions of the fingerprint valleys and ridges according to the electrical signal rule of each photosensitive device 1221 in each fingerprint identification unit 12.
According to the display panel provided by the embodiment of the invention, the fingerprint identification units are arranged at the gaps between the adjacent light-emitting units, and the detection units can determine the positions of the fingerprint valleys and ridges according to the electrical signal rule of each photosensitive device in each fingerprint identification unit, so that fingerprint identification detection can be realized, the detection precision is higher, and the structure is simple.
The display panel provided by the embodiment of the invention is preferably applied to an organic electroluminescent (OLED) display device, and in particular, may be applied to other types of display devices, and the type of the display panel is not limited herein.
In specific implementation, the fingerprint identification units are located in the gaps between the adjacent display units, so that the fingerprint identification units do not affect the aperture ratio of the display panel and the display effect of the display panel, and the distribution of the fingerprint identification units can be set according to the actually required detection accuracy and the space size of the gap between the adjacent display units. In particular, in order to achieve a better fingerprint detection effect, the fingerprint identification units are preferably uniformly distributed in the display panel or in a certain area of the display panel. The distribution of the fingerprint recognition units is not limited herein.
Referring to fig. 1, the fingerprint recognition unit 12 includes: the collimated light source 121 and the photosensitive detection sets 122 respectively located at two sides of the collimated light source 121, and the photosensitive detection sets 122 located in the same fingerprint identification unit 12 are located in the same film layer, that is, the photosensitive detection sets 122 are located at two sides of the collimated light source 121 in the horizontal direction, rather than at the upper and lower sides of the collimated light source 121. By respectively arranging the photosensitive detection groups 122 on the two sides of the collimated light source 121, in the fingerprint identification process, the detection unit can judge the positions of the fingerprint valleys and the ridges according to the electrical signal rule of the photosensitive device 1221 in the photosensitive detection group 122, for example, if only one photosensitive detection group 122 in the fingerprint identification unit 12 outputs an electrical signal, the position between the fingerprint valley and the ridge can be judged to be caused by the contact with the fingerprint identification unit, by combining the electrical signals of a plurality of fingerprint identification units 12, the pattern of the whole fingerprint can be obtained, and the specific detection method will be described in detail in the second aspect.
In practical applications, the distance between the adjacent collimated light sources 121 is smaller than the distance between the fingerprint valleys, so that at least one fingerprint identification unit 12 can be ensured between the valleys, so that the pattern of the whole fingerprint contacting the display panel can be detected, for example, the distance between the fingerprint valleys of a human being is about 100 μm, so that the distance between the adjacent collimated light sources 121 can be set to be smaller than 100 μm, which is only an example, when the device is applied to other scenes, the distance between the adjacent collimated light sources 121 can be set according to practical needs, and in addition, the distance between the adjacent fingerprint identification units 12 cannot be too small in order to avoid the interference between the light rays emitted from the two adjacent fingerprint identification units 12.
In specific implementation, each photosensitive detection group 122 at least includes one photosensitive device 1221, and the number of photosensitive devices 1221 in each photosensitive detector 122 may be set according to precision requirements and space size, in the drawings of the embodiment of the present invention, the photosensitive detector 122 includes two or three photosensitive devices 1221 as an example, and the number of photosensitive devices 1221 in the photosensitive detector 122 is not limited. The photo sensor 1221 may be a PIN photodiode, or may be another photo sensor, which is not limited herein. The size of the photo-sensor may be set according to the precision requirement and the space size, for example, the width of the photo-sensor may be in the range of 10 μm to 20 μm, which is only an example and is not limited to the size of the photo-sensor.
The collimated light source 121 is preferably a monochromatic light wave, for example, a visible light wave such as red, green, or blue light wave, or an invisible light such as an infrared light wave or an ultraviolet light wave, where the wavelength band of the light wave emitted from the collimated light source 121 is not limited, and the photosensor 1221 in the photosensitive detection group 122 is a response device with a wavelength corresponding to that of the collimated light source 121, that is, the photosensor 1221 can absorb the light emitted from the corresponding collimated light source 12 and output an electrical signal.
Specifically, in the display panel provided in the embodiment of the present invention, as shown in fig. 1 and fig. 2, the collimated light source 121 may include: a first light source 1211, a light guide structure 1212 at a light exit surface side of the first light source 1211, and a reflective layer 1213 on a first surface of the light guide structure 1212;
the first surface is a surface where the light guide structure 1212 is not parallel to the base substrate 10;
in a direction in which the light guide structure 1212 is directed toward the first light source 1211, a cross-sectional area of the light guide structure 1212 in a direction parallel to the base substrate 10 is gradually reduced.
As shown in fig. 1 and 2, in a direction in which the light guide structure 1212 is directed toward the first light source 1211, that is, in a direction from top to bottom in the drawing, a cross-sectional area of the light guide structure 1212 in a direction parallel to the substrate base plate 10 gradually decreases, that is, a cross-section of the light guide structure 1212 in a direction perpendicular to the substrate base plate 10 has an inverted trapezoidal shape, or, as it were, the light guide structure 1212 has a truncated pyramid shape or a truncated cone shape. A reflective layer 1213 is disposed on a first surface of the light guide structure 1212, where the first surface is a surface of the light guide structure 1212 not parallel to the substrate 10, or a side surface of the light guide structure 1212, rather than upper and lower bottom surfaces. Since the cross-section of the light guide structure 1212 is an inverted trapezoid, the light guide structure 1212 and the reflective layer 1213 converge the light emitted from the first light source 1211, so that the light with a larger exit angle is focused toward the center of the light guide structure 1212, as shown in fig. 2, the light is reflected by the reflective layer 1213 and then deflected toward the center of the light guide structure 1212, so as to exit in a vertical direction, that is, the light of the first light source 1211 can be collimated by the light guide structure 1212 and the reflective layer 1213, and thus, the first light source 1211 may be a collimated light source, for example, the first light source 1211 may be a non-collimated light source, such as a Light Emitting Diode (LED) light source, for example, a blue LED. The width of the first light source 1211 may be set to about 50 μm.
In order to achieve a better collimation of the light guiding structure 1212 and the reflective layer 1213, the taper angle θ, which is the angle between the first surface and the substrate, may be set to about 45 ° according to the main light field distribution of the first light source 1211.
In a specific implementation, the light guiding structure 1212 may be made of a material with a low refractive index, such as SiNx, SiO2The reflective layer 1213 may be made of a metal material having high reflectivity, such as silver (Ag) or copper (Cu), or other materials, which are not limited hereinAnd (5) limiting.
Further, in the display panel provided in the embodiment of the present invention, as shown in fig. 1 and fig. 2, the collimated light source 121 may further include: a collimating structure 1214 located at one side of the light-emitting surface of the light guiding structure 1212;
the collimating structure 1214 is made up of a plurality of through holes arranged at equal intervals.
The collimating structure 1214 with the plane grating structure is formed by the through holes arranged at equal intervals, so that light rays emitted by the first light source 1211 are further collimated, the collimation degree of the light rays emitted by the collimating light source is improved, and a fingerprint detection result is more accurate. Specifically, the aperture of the through hole constituting the collimating structure 1214 may be in the range of 1 μm to 2 μm, and may be formed by nanoimprinting, or the collimating structure 1214 may be formed by stripe slit, which is not limited herein.
In a specific implementation, in the display panel provided in the embodiment of the present invention, as shown in fig. 1, the photosensitive detection group 122 is located at one side of the light incident surface of the collimating structure 1214.
The light-sensitive detection group 122 is disposed on one side of the light incident surface of the collimating structure 1214, and after the light emitted from the first light source 1211 is reflected by the finger, the reflected light passes through the collimating structure 1214 and then irradiates the light-sensitive detection group 122, so as to improve the collimation of the reflected light, so that the light irradiating the light-sensitive detection group 122 is more convergent, and the detection accuracy of the light-sensitive detection group is improved.
In practical applications, the photosensitive detection group 122 can be located at any position between the alignment structure 1214 and the substrate base plate 10, and the specific position of the photosensitive detection group 122 is not limited herein.
Specifically, in the display panel provided in the embodiment of the present invention, as shown in fig. 1 and fig. 2, the fingerprint identification unit 12 may further include: the light shielding structure 123 is located at one side of the light emitting surface of the light guiding structure 1212 and located between the collimating structure 1214 and the light emitting unit 11.
By providing the light shielding structure 123, the light emitted from the collimated light source 121 can be prevented from affecting the light emitting unit 11. The light shielding structure 123 is disposed between the collimating structure 1214 and the light emitting units 11, when only one fingerprint identification unit 12 is included between two adjacent light emitting units 11, the light shielding structure 123 may be disposed on both sides of the collimating structure 1214, and when two or more fingerprint identification units 12 are included between two adjacent light emitting units 11, the light shielding structure 123 may also be disposed between two adjacent fingerprint identification units 12 to prevent light rays of two adjacent fingerprint identification units 12 from interfering with each other.
In practical implementation, as shown in fig. 1, in the display panel provided in the embodiment of the present invention, the light emitting unit 11 includes: an anode layer 112 on the substrate 10, a cathode layer (not shown) on a side of the anode layer facing away from the substrate, and a light emitting layer (not shown) between the anode layer and the cathode layer;
the fingerprint recognition unit 12 is located in each film layer between the anode layer 112 and the substrate base plate 10.
As shown in fig. 1, a plurality of thin film transistors 111 are included between the anode layer 112 and the substrate 10, and in order to form the thin film transistors, a plurality of insulating layers are generally disposed between the anode layer 112 and the substrate 10, and the insulating layers are generally disposed in a whole layer, so that a plurality of insulating layers are also disposed between adjacent display units 11, and a cathode isolation pillar, a pixel defining layer, and the like are also generally disposed on a side of the anode layer 112 away from the substrate 10, so that the fingerprint identification unit 12 is preferably disposed in a gap between two adjacent display units 11, and in each insulating layer between the cathode layer 112 and the substrate 10.
In the actual manufacturing process, the process of manufacturing the fingerprint recognition unit 12 may be integrated into the process of manufacturing the display panel, or the first light source 1211 and each photo sensor 1221 may be manufactured on the substrate, for example, a light emitting diode may be formed on the substrate as the first light source 1211 and a PIN-type photodiode may be formed as the photo sensor 1221 by using a semiconductor material, and then aligned and attached to the display panel on which the light guide structure 1212 and the collimating structure 1214 are formed, so as to form the structure shown in fig. 1.
In a second aspect, based on the same inventive concept, an embodiment of the present invention provides a method for detecting the display panel. Because the principle of solving the problem of the detection method is similar to that of the display panel, the implementation of the detection method can be referred to the implementation of the display panel, and repeated details are not repeated.
An embodiment of the present invention provides a method for detecting the display panel, as shown in fig. 3, including:
s201, outputting an electric signal by each photosensitive device in each fingerprint identification unit;
s202, the detection unit determines the positions of the fingerprint valleys and ridges according to the rule of the electric signals output by the photosensitive devices.
In the detection method provided by the embodiment of the invention, the detection unit can determine the positions of the fingerprint valleys and ridges according to the electrical signal rule of each photosensitive device in each fingerprint identification unit, so that fingerprint identification detection can be realized, the detection precision is higher, and the structure is simple.
Referring to fig. 1, since the two sides of the collimated light source 121 of each fingerprint identification unit 12 are provided with the photosensitive detection groups 122, the positions of the fingerprint valleys and ridges can be determined by detecting the electrical signals output by the photosensitive detection groups 122, and the pattern of the entire fingerprint contacting the display panel can be obtained by detecting the electrical signals in the plurality of fingerprint identification units 12.
It should be noted that, in the embodiment of the present invention, in order to more clearly illustrate the principle of fingerprint identification, the structures of the display panel are simplified in fig. 4 to 8, and only the structures of two adjacent fingerprint identification units are shown. In the figure, the lower side of the display panel is indicated by a short horizontal line, and the current (or voltage) indicating the electric signal is larger as the short horizontal line is closer to the upper side. In addition, each photosensitive detection group 122 is illustrated as including three photosensitive devices 1221, and the number of the photosensitive devices 1221 is not limited in the drawings.
Further, it is understood that fig. 4 to 8 show a case where a finger touches the display panel, and the fingerprint valleys and ridges are the opposite of the concave-convex case in the schematic drawing, that is, the positions of the protrusions in the fingerprint 13 are "valleys" and the positions of the depressions are "ridges".
Specifically, in the detection method provided by the embodiment of the present invention, the distance between the collimated light sources in the adjacent fingerprint identification units is greater than the distance between the fingerprint valley and the ridge and less than the distance between the fingerprint valley and the valley (so that each fingerprint valley corresponds to at most one fingerprint identification unit);
referring to fig. 4 to 7, when a finger touches the display panel, the light emitted from the collimated light source 121 is directed to either the position between the valley and the ridge of the fingerprint 13 as shown in fig. 4 and 5, or the position of the valley of the fingerprint 13 as shown in fig. 6, or the position of the ridge of the fingerprint 13. As shown in fig. 4, if the light emitted from the collimated light source 121 is emitted to the left side of the valley of the fingerprint 13, most of the light will be emitted to the photosensitive detection group 122 on the right side after the light is reflected, and because the reflection angle of the light is large, more light will be emitted to the photosensitive detection group 122, and each photosensitive device 1221 in the photosensitive detection group 122 can generate a photo-generated current to output a high-current (or high-voltage) electrical signal. Fig. 5 is similar to fig. 4, except that the light emitted from the collimated light source 121 in fig. 5 is directed to the right side of the valley of the fingerprint 13, and the left photosensitive detection group 122 can output high current (or high voltage) electrical signals. That is, fig. 4 and 5 illustrate the positions where the light from the collimated light source 121 is directed between the fingerprint valleys and ridges. As shown in fig. 6, if the light emitted from the collimated light source 121 is emitted to the valley of the fingerprint 13, most of the light will return in the opposite direction after being reflected, and a small portion of the light will be reflected to the photosensitive detection group 122 at a smaller reflection angle, and only the photosensitive device 1221 close to the collimated light source 121 can output a high current (or high voltage) electrical signal due to the smaller reflection angle of the light. Fig. 7 shows the position of the light emitted from the collimated light 121 to the ridge of the fingerprint 13, and similar to fig. 6, most of the light will return in the opposite direction, and a small part of the light will be reflected to the photosensitive detection group 122 with a smaller reflection angle, so that only the photosensitive device 1221 near the collimated light source 121 can output high current (or high voltage) electrical signals, unlike fig. 6, because the distance between the fingerprint 13 and the collimated light source 121 in fig. 7 is smaller, the reflected light is more, and the electrical signals output by the photosensitive device in fig. 7 are stronger.
Based on the above analysis, the locations of the valleys and ridges may be determined in the following manner when implemented.
Specifically, the step S202 may include:
if the detecting unit detects that only one photosensitive detection group in the fingerprint identification unit can output an electric signal larger than the first threshold value, the fingerprint identification unit corresponds to the position between the fingerprint valley and the fingerprint ridge.
If the electric signal (voltage or current) output by the photosensitive device is detected to be larger than the first threshold, the electric signal output by the photosensitive device is high, and if the electric signal output by the photosensitive device is detected to be smaller than the first threshold, the electric signal output by the photosensitive device is low.
In step S202, if it is detected that only one photosensitive detection group in the fingerprint identification unit can output a high current (or high voltage) electrical signal, the light emitted from the collimated light source is reflected at a larger reflection angle after being emitted to the fingerprint, so that it can be determined whether the light emitted from the collimated light source is emitted to a position between a fingerprint valley and a ridge, that is, the position between the fingerprint valley and the ridge is in contact with the fingerprint identification unit, and then the photosensitive detection group capable of outputting a high current (or high voltage) electrical signal is located on the left side or the right side of the collimated light source, so that it can be further determined whether the light corresponds to the left side or the right side of the fingerprint valley. As shown in fig. 4, if the electrical signals of all the photosensors 1221 in the right photosensitive detection group 122 in the fingerprint identification unit are all high, it can be determined that the fingerprint identification unit corresponds to the left side of the fingerprint valley. As shown in fig. 5, if the electrical signals of the photosensors 1221 in the left photosensitive detection group 122 in the fingerprint identification unit are all high, it can be determined that the fingerprint identification unit corresponds to the right side of the fingerprint valley.
In addition, the positions of the fingerprint valleys and ridges can be determined according to the electrical signal rules of a plurality of fingerprint identification units, for example, the electrical signal rules of two fingerprint identification units in fig. 4 are as follows: the electrical signal rule of the two fingerprint identification units in fig. 5 is as follows: high-low, therefore, when the electrical signal is detected, the rule is: low, high, the fingerprint pattern may be determined to have the shape shown in fig. 4.
Further, in the detection method provided in the embodiment of the present invention, the step S202 may further include:
if the detection unit detects that two photosensitive detection groups in the fingerprint identification unit can output electric signals which are larger than a first threshold value and smaller than a second threshold value, the fingerprint identification unit corresponds to the position of a fingerprint valley;
if two photosensitive detection groups in the fingerprint identification unit detected by the detection unit can output electric signals larger than the second threshold value, the fingerprint identification unit corresponds to the position of the fingerprint ridge.
If it is detected that both photosensitive detection groups in the fingerprint identification unit can output high-voltage (or high-current) signals, the light emitted by the collimation light source is reflected by a smaller reflection angle after being emitted to the fingerprint, so that the light emitted by the collimation light source can be stopped to be emitted to the position of a fingerprint valley or ridge, whether the light corresponds to the valley or the ridge can be determined by combining the size of the output electric signal, if the electric signal is greater than a second threshold value, more light is emitted to the photosensitive detection group, the position of the fingerprint identification unit corresponding to the fingerprint ridge can be determined, and if the electric signal is less than the second threshold value, less light is emitted to the photosensitive detection group, the position of the fingerprint identification unit corresponding to the fingerprint valley can be determined.
In addition, the positions of the fingerprint valleys and ridges can also be judged according to the electrical signal laws of the plurality of fingerprint identification units, and if the electrical signal laws of two adjacent fingerprint identification units are detected, the following rules are adopted: the height is low, the height is high, the positions of the two fingerprint identification units corresponding to the valleys or the ridges of the fingerprint can be determined, and the positions of the fingerprint identification units corresponding to the valleys or the ridges can be determined by combining the magnitude of the electric signals, so that the pattern shown in fig. 6 or the pattern shown in fig. 7 can be distinguished.
Furthermore, as shown in fig. 8, when the distance between adjacent collimated light sources is smaller than the distance between a fingerprint valley and a ridge, each fingerprint valley corresponds to two or more fingerprint identification units. Similar to the above case where each fingerprint valley corresponds to at most one fingerprint identification unit, the positions of the fingerprint valleys and ridges can also be determined by determining the rule of the electrical signals output by the photosensitive detection group. For example, when the electrical signals of the adjacent four fingerprint identification units are detected to be regular "low, high, low", the pattern of the corresponding fingerprint can be determined to be in the shape shown in fig. 8. For the case that each fingerprint valley corresponds to more fingerprint identification units, detection can be performed in a manner similar to the above-described detection manner, which is not described in detail herein.
In a third aspect, based on the same inventive concept, an embodiment of the present invention provides a display device, including the above 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 display panel, the detection method and the display device provided by the embodiment of the invention, the fingerprint identification units are arranged at the gaps between the adjacent light-emitting units, and the detection units can determine the positions of the fingerprint valleys and ridges according to the electrical signal rule of each photosensitive device in each fingerprint identification unit, so that fingerprint identification detection can be realized, and the detection precision is high.
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 display panel, comprising: the fingerprint identification device comprises a substrate base plate, light emitting units, fingerprint identification units and detection units, wherein the light emitting units are positioned on the substrate base plate; wherein,
the fingerprint identification unit comprises: the device comprises a collimation light source and photosensitive detection groups respectively positioned at two sides of the collimation light source;
the distance between the adjacent collimated light sources is smaller than the distance between the fingerprint valleys;
each photosensitive detection group in the same fingerprint identification unit is positioned in the same film layer, and each photosensitive detection group at least comprises a photosensitive device;
the detection unit is electrically connected with each photosensitive device and used for determining the positions of the fingerprint valleys and ridges according to the electrical signal rule of each photosensitive device in each fingerprint identification unit.
2. The display panel of claim 1, wherein the collimated light source comprises: the light source comprises a first light source, a light guide structure and a reflecting layer, wherein the light guide structure is positioned on one side of a light emitting surface of the first light source;
the first surface is a surface of the light guide structure which is not parallel to the substrate base plate;
in the direction of the light guide structure pointing to the first light source, the cross-sectional area of the light guide structure in the direction parallel to the substrate base plate gradually decreases.
3. The display panel of claim 2, wherein the collimated light source further comprises: the collimation structure is positioned on one side of the light-emitting surface of the light guide structure;
the collimating structure is composed of a plurality of through holes arranged at equal intervals.
4. The display panel of claim 3, wherein the photosensitive detection group is located on one side of the light incident surface of the collimating structure.
5. The display panel of claim 3, wherein the fingerprint recognition unit further comprises: and the shading structure is positioned on one side of the light-emitting surface of the light guide structure and between the collimation structure and the light-emitting unit.
6. The display panel according to claim 3, wherein the light emitting unit includes: the light-emitting layer is positioned between the anode layer and the cathode layer;
the fingerprint identification unit is positioned in each film layer between the anode and the substrate base plate.
7. A method for inspecting a display panel according to any one of claims 1 to 6, comprising:
each photosensitive device in each fingerprint identification unit outputs an electric signal;
the detection unit determines the positions of the fingerprint valleys and ridges according to the rule of the electric signals output by the photosensitive devices.
8. The detection method according to claim 7, wherein the distance of the collimated light sources in the adjacent fingerprint identification units is greater than the distance between fingerprint valleys and ridges and less than the distance between fingerprint valleys and valleys;
the detecting unit determines the positions of the fingerprint valley and the ridge according to the rule of the electric signals output by the photosensitive devices, and the detecting unit comprises:
if the detection unit detects that only one photosensitive detection group in the fingerprint identification unit can output an electric signal larger than a first threshold value, the fingerprint identification unit corresponds to the position between the fingerprint valley and the fingerprint ridge.
9. The detection method according to claim 7, wherein the distance of the collimated light sources in the adjacent fingerprint identification units is greater than the distance between valleys and ridges and less than the distance between valleys and valleys;
the detecting unit determines the positions of the fingerprint valley and the ridge according to the rule of the electric signals output by the photosensitive devices, and the detecting unit comprises:
if the detection unit detects that two photosensitive detection groups in the fingerprint identification unit can output electric signals which are larger than a first threshold value and smaller than a second threshold value, the fingerprint identification unit corresponds to the position of a fingerprint valley;
if the two photosensitive detection groups in the fingerprint identification unit detected by the detection unit can output electric signals larger than a second threshold value, the fingerprint identification unit corresponds to the position of the fingerprint ridge.
10. A display device, comprising: a display panel according to any one of claims 1 to 6.
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