CN112416179B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN112416179B CN112416179B CN202011436458.3A CN202011436458A CN112416179B CN 112416179 B CN112416179 B CN 112416179B CN 202011436458 A CN202011436458 A CN 202011436458A CN 112416179 B CN112416179 B CN 112416179B
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- 238000006243 chemical reaction Methods 0.000 claims description 88
- 239000000758 substrate Substances 0.000 claims description 20
- 230000003287 optical effect Effects 0.000 claims description 10
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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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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- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
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- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Image Input (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The embodiment of the invention discloses a display panel and a display device, wherein the display panel comprises a display module, at least one light source and a control module, wherein the light source is positioned on at least one side surface of the display module, the control module is connected with each light source, and the control module is used for lighting at least one light source in a fingerprint identification stage, so that light emitted by lighting the light source can reach the fingerprint identification module after being reflected or refracted by a film layer in the display module, the brightness of the light reaching the fingerprint identification module is further increased, and the sensitivity of fingerprint identification is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a display device.
Background
With the development of display technology, display panels with fingerprint recognition function are increasingly used.
The existing display panel generally comprises a multi-layer film structure, so that the intensity of light received by the fingerprint identification device is weak, and the display panel becomes a big obstacle for realizing fingerprint identification.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for improving the intensity of light received by a fingerprint identification device and further improving the sensitivity of fingerprint identification.
In a first aspect, an embodiment of the present invention provides a display panel, where the display panel includes a fingerprint identification area, and the display panel further includes:
The display module comprises a light emitting surface, a back light surface and at least one side surface which is connected with the light emitting surface and the back light surface; the display module comprises a plurality of film layers, wherein the film layers comprise light-transmitting film layers and light-emitting device layers;
at least one light source positioned on at least one side surface of the display module;
And the control module is electrically connected with each light source and is used for controlling at least one light source to be lightened in the fingerprint identification stage so as to enable the at least one light source to be lightened to emit light to the fingerprint identification area of the display module.
Optionally, the control module includes at least one photoelectric conversion unit, and the photoelectric conversion unit is located the backlight side of light emitting device layer and is located the fingerprint identification district, and at least one light source is connected to every photoelectric conversion unit, and photoelectric conversion unit is used for converting the light signal that self received into the electrical signal and export to the light source that corresponds the connection to make the light source light.
Optionally, the display panel comprises at least two light sources, the control module comprises at least two photoelectric conversion units and at least two output control units, each photoelectric conversion unit is connected with a light source through an output control unit, and the photoelectric conversion unit is located on the backlight side of the light emitting device layer and located in the fingerprint identification area;
the photoelectric conversion unit is used for converting the optical signal received by the photoelectric conversion unit into an electric signal; the output control unit is used for transmitting the electric signal obtained by converting the photoelectric conversion unit to the corresponding connected light source after receiving the conduction control signal of the fingerprint identification module.
Optionally, the fingerprint recognition module is used for outputting the conduction control signal to the output control unit corresponding to the light source closest to the position of the fingerprint recognition module receiving the reflected light according to the position of the received fingerprint reflected light in the fingerprint recognition stage.
Optionally, the display panel includes a first light source and a second light source, where the first light source and the second light source are disposed on a first side and a second side opposite to the display module;
preferably, the vertical distance between the first side and the second side is smaller than the vertical distance between the third side and the fourth side, the third side and the fourth side are two sides connecting the first side and the second side, and the third side is opposite to the fourth side;
optionally, the positions of the first light source and the second light source correspond to the fingerprint identification area;
optionally, the display panel further includes a third light source, and the third light source is located on a third side surface of the display module;
optionally, the vertical distance between the third side surface and the fingerprint identification area is smaller than the vertical distance between the fourth side surface and the fingerprint identification area;
optionally, the position of the third light source corresponds to the fingerprint identification area.
Optionally, the photoelectric conversion unit is specifically configured to output an electrical signal for controlling the brightness of the light source to be inversely related to the light intensity according to the received light intensity.
Optionally, the display panel further includes a brightness adjusting module, the brightness adjusting module is connected between the photoelectric conversion unit and the corresponding light source, and is configured to output a first voltage to the connected light source after receiving the first electrical signal, and configured to output a second voltage to the light source after receiving the second electrical signal, where the light intensity of the corresponding received light signal when the photoelectric conversion unit outputs the first electrical signal is smaller than the light intensity of the corresponding received light signal when the second electrical signal is output, and the first voltage is greater than the second voltage.
Optionally, the light emitting surface of the light source is parallel to the side surface where the light source is located; or the angle between the light-emitting surface of the light source and the side surface of the light source is an acute angle.
Optionally, the display module comprises an array substrate, a light emitting device layer, a packaging layer, a polaroid and a cover plate which are arranged in a stacked manner; the light source is positioned on at least one side surface of at least one of the array substrate, the light-emitting device layer, the packaging layer, the polaroid and the cover plate; optionally, the light source is located on at least one side of the cover plate.
The optional display panel further comprises a fingerprint identification module, wherein the fingerprint identification module comprises a fingerprint identification device, the fingerprint identification device is positioned in the array substrate, or the fingerprint identification module is positioned on one side of the array substrate away from the light-emitting device layer.
In a second aspect, an embodiment of the present invention provides a display device, including the display panel provided in the first aspect.
The display panel and the display device provided by the embodiment of the invention comprise the display module, at least one light source and the control module, wherein the light source is positioned on at least one side surface of the display module, the control module is connected with each light source, and the control module is used for lighting the at least one light source in the fingerprint identification stage, so that light emitted by the light source after being lighted up can reach the fingerprint identification module after being reflected or refracted by a film layer in the display module, the brightness of the light reaching the fingerprint identification module is further increased, and the sensitivity of fingerprint identification is improved.
Drawings
Fig. 1 is a top view of a display panel according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of a display panel according to an embodiment of the present invention;
FIG. 3 is a top view of another display panel according to an embodiment of the present invention;
fig. 4 is a cross-sectional view of a display panel according to an embodiment of the present invention;
Fig. 5 is a cross-sectional view of another display panel provided by an embodiment of the present invention;
FIG. 6 is a top view of another display panel according to an embodiment of the present invention;
FIG. 7 is a top view of another display panel according to an embodiment of the present invention;
fig. 8 is a cross-sectional view of a display panel according to an embodiment of the present invention;
fig. 9 is a cross-sectional view of another display panel provided by an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of another display panel according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
As described in the background art, the existing display panel generally includes a multi-layered film structure, so that the intensity of light received by the fingerprint recognition device is weak, which becomes a big obstacle to fingerprint recognition. The inventor has found that the above problem arises because each layer of the film structure of the display panel is not completely transparent, so that the overall transmittance of the display panel is low. The top of the fingerprint identification device generally comprises a plurality of layers of film structures of the display panel, the light reflected by the fingerprint can reach the fingerprint identification device only through the film structures of the display panel above the fingerprint identification device, and the film structures are not completely transparent, and the light reflected by the fingerprint is limited, so that the brightness of the light reaching the fingerprint identification device is weaker, the fingerprint identification performance is finally influenced, and the fingerprint identification sensitivity is reduced.
For the above reasons, an embodiment of the present invention provides a display panel, fig. 1 is a top view of the display panel provided by the embodiment of the present invention, and fig. 2 is a cross-sectional view of the display panel provided by the embodiment of the present invention, where fig. 2 may correspond to the cross-sectional view of fig. 1 taken along a section line B-B', and referring to fig. 1 and fig. 2, the display panel includes a fingerprint recognition area FA, and the display panel further includes:
The display module 110, the display module 110 includes a light emergent surface 111, a backlight surface 112 and at least one side 113 connecting the light emergent surface 111 and the backlight surface 112; the display module 110 includes a plurality of film layers, wherein the plurality of film layers include a light-transmitting film layer, and the plurality of film layers include a light-emitting device layer 114;
at least one light source 120, the light source 120 is located on at least one side 113 of the display module 110;
the control module 130 is electrically connected to each light source 120, and is configured to control at least one light source 120 to be turned on during the fingerprint recognition stage, so that the at least one light source 120 emits light to the fingerprint recognition area FA of the display module 110.
Specifically, the shape of the display module may be rectangular, rounded rectangle, circular, etc., and the embodiment is not limited herein. When the display module is rectangular or rounded rectangular, the display panel comprises four side surfaces; when the display module is circular, the display module may be considered to include an annular side.
The display module 110 includes a plurality of film layers, wherein a portion of the film layers may be light-transmitting film layers, another portion of the film layers may be light-non-transmitting film layers, and light emitted by the light source 120 located on the side 113 of the display module 110 may enter the display module 110 through the light-transmitting film layers and reach the fingerprint recognition area FA. Optionally, a portion of the film layer of the display module 110 forms the light emitting device layer 114, and one side of the light emitting device layer 114 may include the array substrate 115 and the other side may include the light transmitting film layer 116. The light emitting side of the light emitting device layer 114 is a side of the light emitting device layer 114 away from the array substrate 115. The light emitting device layer 114 may include a first electrode layer, a light emitting layer, and a second electrode layer stacked from one side of the array substrate 115, wherein the first electrode layer may include a plurality of block-shaped first electrodes, and optionally, the first electrodes are anodes of the light emitting devices and the second electrodes are cathodes of the light emitting devices. The fingerprint recognition area FA may further include a fingerprint recognition module 140, and the fingerprint recognition module 140 may be included in the display panel of the present embodiment or may be included in the display device of the present embodiment. When the fingerprint recognition module 140 includes a fingerprint recognition device, the fingerprint recognition module 140 may be included in the display panel of the present embodiment, optionally, the fingerprint recognition device is located in the array substrate 115, or the fingerprint recognition module 140 is located on a side of the array substrate 115 away from the light emitting device layer 114. The fingerprint recognition module 140 may be disposed on the lower side of the display module 110 (i.e. the backlight surface of the display module 110), or may be integrated in the display panel, for example, as described above, and integrated in the array substrate 115, when integrated in the display panel, the fingerprint recognition module 140 is at least located on the lower side of a portion of the film structure of the display panel, i.e. the film structure of the display panel is included between the fingerprint recognition module 140 and the light-emitting surface 111 of the display panel.
When the identification body (such as a finger) is placed in the fingerprint identification area FA of the display panel, the light emitted by the light emitting device is reflected to pass through the film layer structure of the fingerprint identification area FA of the display module 110 to reach the fingerprint identification module 140, so as to realize fingerprint identification.
Alternatively, the light source 120 may be an infrared light source, an LED light source, etc., which is not limited herein. The position of the light source 120 needs to ensure that the emergent light of the light source 120 can irradiate the fingerprint recognition area FA of the display panel. As described above, the arrangement of the position of the light source 120 needs to consider that the light emitted from the light source 120 can be ensured to illuminate the fingerprint recognition area FA of the display panel, and the light emitted from the light emitting device layer 114 cannot be blocked, so that the display effect is not affected. Therefore, in the display panel of this embodiment, the light source 120 is disposed on the side 113 of the display module 110, so that the light emitted by the light source 120 can be ensured to be irradiated to the fingerprint identification area FA of the display panel, and the light emitted by the light emitting device layer 114 can be not blocked. Specifically, the light source 120 may correspond to the fingerprint recognition area FA of the display panel, so as to ensure that the light emitted by the light source 120 can reach the fingerprint recognition area FA of the display panel. The light source 120 corresponds to the fingerprint recognition area FA, which may mean that a vertical projection of a film structure of the fingerprint recognition area FA of the display panel on the side 113 where the light source 120 is located at least partially overlaps the light source 120.
The display panel further includes a control module 130, where the control module 130 is electrically connected to each light source 120, and is used for controlling the lighting state of the light source 120. In the fingerprint identification stage, the control module 130 can control at least one light source 120 to light up, so that the light emitted by the light source 120 reaches the fingerprint identification area FA, the light brightness that can reach the fingerprint identification module 140 is increased, and the problem of insensitive fingerprint identification caused by too weak light brightness reaching the fingerprint identification device in the prior art is avoided. Specifically, the working process of the display panel may include: when the recognition subject (e.g., a finger) is placed on the surface of the display panel and placed in the fingerprint recognition area FA, the control module 130 determines that the display panel enters the fingerprint recognition stage and outputs a lighting control signal to the at least one light source 120 to light the at least one light source 120. After the light source 120 is turned on, light is emitted from the side 113 of the display panel to the fingerprint identification area FA of the display panel, specifically, when the light source 120 emits light to the fingerprint identification area FA, the light emitted by the light source 120 can reach a light-transmitting film layer of the display panel, and multiple reflection, diffuse reflection and/or refraction occur in each film layer structure of the display panel, so that the light emitted by the light source 120 reaches the fingerprint identification module 140 after multiple reflection, diffuse reflection and/or refraction, thereby increasing the brightness of the light which can reach the fingerprint identification sensing module, ensuring the realization of the fingerprint identification function and improving the sensitivity of fingerprint identification.
Alternatively, the control module 130 may be the fingerprint recognition module 140, and fig. 2 schematically illustrates a case where the control module 130 is the fingerprint recognition module 140. The fingerprint recognition module 140 may integrate a driving unit, and after receiving the light reflected by the finger, the fingerprint recognition module 140 may output a driving signal to the at least one light source 120 through the driving unit, so that the at least one light source 120 is turned on. For example, the fingerprint recognition module 140 is integrated with driving units corresponding to the light sources 120 one by one, and after the fingerprint recognition module 140 receives the light reflected by the finger, the driving units can output driving signals to the light sources 120 correspondingly connected to control the corresponding connected light sources 120 to be lightened.
The control module can also be at the driver chip of display panel, and optionally, after fingerprint identification module received fingerprint reflection's light, can be with this reflection light conversion corresponding electric current output to driver chip, the driver chip carries out fingerprint identification through the analysis to the electric current signal. Optionally, the driving chip outputs a driving signal to the at least one light source after receiving the current signal, so that the at least one light source is turned on.
The control module 130 may be other structures additionally added to the display panel, and the embodiment is not limited herein.
The display panel that this embodiment provided, through setting up display panel and including display module, at least one light source and control module, wherein the light source is located at least one side of display module, control module connects each light source, through at the fingerprint identification stage, control module lights at least one light source for the light that the light source was lighted and is sent can reach fingerprint identification module after the reflection or the refraction of rete in the display module, and then the increase reaches fingerprint identification module's light luminance, improves fingerprint identification's sensitivity.
The above embodiment describes the case where the control module is a fingerprint recognition module or a driving chip of the display panel, and the following embodiment describes the case where the control module is a structure additionally added to the display panel.
Fig. 3 is a top view of another display panel according to an embodiment of the present invention, and fig. 4 is a cross-sectional view of the display panel according to an embodiment of the present invention, wherein fig. 4 may correspond to a cross-sectional view of fig. 3 taken along a section line C-C', and referring to fig. 3 and 4, optionally, the control module 130 includes at least one photoelectric conversion unit 131, the photoelectric conversion unit 131 is located on a backlight side of the light emitting device layer 114 and located in the fingerprint recognition area FA, each photoelectric conversion unit 131 is connected to at least one light source 120, and the photoelectric conversion unit 131 is configured to convert a light signal received by itself into an electrical signal and output the electrical signal to the corresponding connected light source 120, so that the light source 120 is turned on.
Specifically, the photoelectric conversion unit 131 may be integrated in the array substrate 115 of the display panel, and fabricated together with the circuit structure in the array substrate 115; may also be disposed on a side of the array substrate 115 away from the light emitting device layer 114, where fig. 4 illustrates a case where the control module 130 includes a photoelectric conversion unit 131, the photoelectric conversion unit 131 is connected to a light source, and the photoelectric conversion unit 131 is disposed on a side of the array substrate 115 away from the light emitting device layer 114. The photoelectric conversion unit 131 is located in the fingerprint recognition area FA, when the recognition body is placed on the surface of the display panel, the photoelectric conversion unit 131 may also receive the light reflected by the recognition body, and the photoelectric conversion unit 131 converts the received light signal into an electrical signal and outputs the electrical signal to the light source 120 correspondingly connected, so that the light source 120 is turned on. The photoelectric conversion unit 131 may be a photoelectric conversion diode. When the magnitude of the electrical signal that can be output by the photoelectric conversion unit 131 is limited, in order to avoid that the electrical signal is insufficient to drive the light source 120 to light, a boost driving circuit may be disposed between the photoelectric conversion unit 131 and the light source 120, where the boost driving voltage may be used to boost the electrical signal output by the photoelectric conversion unit and output the boosted electrical signal to the light source 120 correspondingly connected, so that the light source 120 lights.
Alternatively, the control module 130 includes a photoelectric conversion unit 131, where the photoelectric conversion unit 131 may be connected to a plurality of light sources 120 disposed in the display panel, and the photoelectric conversion unit 131 may control all the light sources 120 in the display panel, and for example, after the photoelectric conversion unit 131 receives the fingerprint reflected light, an electrical signal is output to each light source 120, so that each light source 120 is lit. Alternatively, the control module 130 may include the same number of photoelectric conversion units 131 as the light sources 120, the photoelectric conversion units 131 being electrically connected to the light sources 120 in a one-to-one correspondence, and each photoelectric conversion unit 131 being operable to control the lighting state of the light source 120 electrically connected thereto.
Fig. 5 is a cross-sectional view of another display panel provided in an embodiment of the present invention, and fig. 5 may correspond to another cross-sectional view taken along B-B' of fig. 1, referring to fig. 5, optionally, the display panel includes at least two light sources 120, the control module includes at least two photoelectric conversion units 131 and at least two output control units 132, each photoelectric conversion unit 131 is connected to a light source 120 through an output control unit 132, and the photoelectric conversion unit 131 is located on the backlight side of the light emitting device layer 114 and is located in the fingerprint recognition area FA;
The photoelectric conversion unit 131 is configured to convert an optical signal received by itself into an electrical signal; the output control unit 132 is configured to, after receiving the on control signal of the fingerprint identification module 140, transmit the electrical signal obtained by the photoelectric conversion unit 131 to the corresponding connected light source 120. In which the case where the display panel includes two photoelectric conversion units 131 and two light sources 120 is schematically shown in fig. 5.
In particular, when at least two light sources 120 are included in the display panel, it may be necessary to light one or several of the light sources 120 in some cases, and the display panel of this embodiment is particularly suitable for the above case. Specifically, the control module includes, in addition to the photoelectric conversion units 131, an output control unit 132, and each photoelectric conversion unit 131 is connected to a light source 120 through an output control unit 132, so whether the electrical signal converted by the photoelectric conversion unit 131 can be output to the corresponding light source 120 or not needs to be controlled by the output control unit 132 connected between the photoelectric conversion unit 131 and the light source 120. The output control unit 132 may include a switch, for example, the switch may be a transistor shown in fig. 5, a gate of the transistor may be connected to the fingerprint recognition module 140, a first pole of the transistor is connected to the photoelectric conversion unit 131, a second pole of the transistor is connected to the light source 120, after the fingerprint recognition module 140 receives the fingerprint reflected light, a conduction control signal may be output to the gate of the transistor of any one output control unit 132, some output control units 132 or all output control units 132, so that after the transistor is turned on, the photoelectric conversion unit 131 electrically connected to the transistor is connected to the light source 120, and the light source 120 is turned on. When the display panel includes at least two light sources 120, different light sources 120 may be located on the same side 113 of the display panel, or may be located on different sides 113 of the display panel, which is not limited herein.
With continued reference to fig. 1,2 and 5, the display panel may optionally include a first light source 121 and a second light source 122, where the first light source 121 and the second light source 122 are disposed on a first side 1131 and a first side 1132 of the display module 110 opposite to each other.
Specifically, the first light source 121 and the second light source 122 are disposed on the opposite first side 1131 and the first side 1132, so that when the first light source 121 and the second light source 122 are both on, the light intensity reaching the fingerprint recognition module 140 is greater, and further fingerprint recognition sensitivity is further improved. Optionally, the positions of the first light source 121 and the second light source 122 correspond to the fingerprint identification area FA, so that the light emitted by the first light source 121 and the second light source 122 can reach the fingerprint identification area FA.
Fig. 6 is a top view of another display panel according to an embodiment of the present invention, and referring to fig. 1 and 6, alternatively, a vertical distance between a first side 1131 and a first side 1132 is smaller than a vertical distance between a third side 1133 and a fourth side 1134, the third side 1133 and the fourth side 1134 are two sides 113 connecting the first side 1131 and the first side 1132, and the third side 1133 is opposite to the fourth side 1134.
Alternatively, the display panel may be a rectangular or rounded rectangular display panel, and fig. 1 schematically illustrates a structure when the display panel is a rectangular display panel. With continued reference to fig. 1, the display panel optionally includes opposing light exit face 111 and backlight face 112, opposing first side face 1131 and first side face 1132, opposing third side face 1133 and fourth side face 1134. Wherein the vertical distance between the third side 1133 and the fourth side 1134 is greater than the vertical distance between the first side 1131 and the first side 1132.
With continued reference to fig. 6, optionally, the third side 1133 is at a smaller vertical distance from the fingerprint recognition area FA than the fourth side 1134; the display panel further includes a third light source 123, where the third light source 123 is located on a third side 1133 of the display module 110; the position of the third light source 123 may correspond to the fingerprint recognition area FA, and when the third light source 123 is turned on, the brightness of the light reaching the fingerprint recognition module 140 is further improved. Alternatively, a side near the fourth side 1134 may include an image pickup photosensitive element.
In particular, the fingerprint recognition area FA of the display panel may have a smaller area that matches a finger, and may be equal to a finger fingerprint area, wherein the finger fingerprint area may be obtained by collecting a maximum fingerprint area or an average fingerprint area among fingerprint data about a large number of users of different ages, different countries, etc. When the area of the fingerprint identification area FA of the display panel matches with the fingerprint area of the finger, fingerprint identification can only be performed at a fixed position of the display panel. Alternatively, when the area of the fingerprint recognition area FA of the display panel matches the area of the fingerprint of the finger, the fingerprint recognition area FA may be disposed at a middle portion in a certain fixed direction, that is, in the fixed direction, the distances between the fingerprint recognition area FA and the edges of the different sides of the display panel are equal. Fig. 1, 3 and 6 show a case where the display panel is rectangular, in which in the first direction x, the fingerprint recognition area FA is located in the middle area of the display panel, and the fingerprint recognition area FA is equally spaced from both sides in the first direction.
Fig. 7 is a top view of another display panel provided by the embodiment of the present invention, and fig. 8 is a cross-sectional view of the display panel provided by the embodiment of the present invention, where fig. 8 may correspond to the cross-sectional view of fig. 7 taken along the section line D-D', referring to fig. 7 and fig. 8, the fingerprint recognition area FA of the display panel may also have a larger area, which is larger than the fingerprint area FA, where the fingerprint area FA is equal to the fingerprint area FA, and the area of the fingerprint recognition area FA is relatively unfixed, i.e. fingerprint recognition may be implemented at a plurality of positions of the display panel, where the fingerprint recognition module 140 may also have a relatively larger area, and optionally, the difference between the area of the fingerprint recognition module 140 and the area FA of the fingerprint recognition area FA is within a set range. If the finger placement position of the user is relatively close to a light source 120, only the light source 120 close to the finger position is turned on at this time, so that the brightness of the light reaching the fingerprint recognition position of the fingerprint recognition module 140 is greatly improved, and the light source 120 far away from the finger has no great effect on improving the brightness of the light at the fingerprint recognition position, so that only the nearest light source 120 far away from the finger position can be optionally turned on.
Optionally, the fingerprint recognition module 140 is configured to output, in the fingerprint recognition stage, a turn-on control signal to the output control unit 132 corresponding to the light source 120 closest to the position of the fingerprint recognition module 140 that receives the reflected light according to the position of the reflected light.
The fingerprint recognition module 140 can sense the reflected light and output a turn-on control signal to the output control unit 132 corresponding to the light source 120 closest to the position according to the position of the sensed light, so that the output control unit 132 receiving the turn-on control signal is turned on. Since the photoelectric conversion unit 131 is also located in the fingerprint recognition area FA, the photoelectric conversion unit 131 always performs photoelectric conversion, that is, converts the received optical signal into an electrical signal when the fingerprint recognition is performed, and outputs the electrical signal to the corresponding light source 120 through the output control unit 132 when the photoelectric conversion unit 131 is turned on. Therefore, after the output control unit 132 corresponding to the light source 120 closest to the fingerprint recognition module 140 receiving the reflected light is turned on, and the other light sources 120 are not turned on, so that the power consumption of the display panel can be smaller on the basis of increasing the brightness of the light reaching the fingerprint recognition module 140.
In the above embodiments, the photoelectric conversion unit 131 may be integrated in the fingerprint recognition module 140, and may be independent of the fingerprint recognition module 140, which is not specifically limited herein.
On the basis of the above technical solution, optionally, the photoelectric conversion unit is specifically configured to output an electrical signal for controlling the brightness of the light source to be inversely related to the light intensity according to the received light intensity.
Specifically, when the light intensities received by the photoelectric conversion units are different, the output electrical signals may be different, and when the electrical signals output by the photoelectric conversion units are different, the brightness of the corresponding connected light sources is different. In this embodiment, the photoelectric conversion unit outputs an electrical signal for controlling the negative correlation of the brightness of the light source and the light intensity according to the received light intensity, so that the weaker the light intensity received by the photoelectric conversion unit is, the larger the brightness of the light source is output, the stronger the light intensity received by the photoelectric conversion unit is, the smaller the brightness of the light source is output, further the brightness of the light source is complemented with the brightness of the light reflected by the fingerprint, when the brightness of the light reflected by the fingerprint is ensured to be weaker, the light source can be adjusted to have larger brightness through the photoelectric conversion unit, further the brightness of the light reaching the fingerprint identification module is improved, and the sensitivity of fingerprint identification is ensured; and when guaranteeing that the light brightness of fingerprint reflection is stronger, can have less luminance through photoelectric conversion unit adjustment light source, and then save display panel's consumption.
In addition to the display panel structure shown in fig. 2, 4, 5 or 8, the display panel may further include a brightness adjustment module, and fig. 9 is a cross-sectional view of another display panel according to an embodiment of the present invention, and fig. 9 illustrates a structure of the display panel to which the brightness adjustment module is added on the basis of fig. 2. Referring to fig. 9, optionally, the brightness adjustment module 150 is connected between the photoelectric conversion unit 131 and the corresponding light source 120, and the brightness adjustment module 150 is configured to output a first voltage to the connected light source 120 after receiving the first electrical signal, and configured to output a second voltage to the light source 120 after receiving the second electrical signal, where the light intensity of the corresponding received light signal when the photoelectric conversion unit 131 outputs the first electrical signal is smaller than the light intensity of the corresponding received light signal when the second electrical signal is output, and the first voltage is greater than the second voltage.
Specifically, the brightness adjustment module 150 may be a power source or a circuit that outputs different voltages according to different input signals. Alternatively, the brightness adjustment module 150 may be a voltage conversion circuit, and after the photoelectric conversion unit 131 outputs an electrical signal (the electrical signal may be a voltage signal), the voltage conversion circuit performs voltage conversion on the electrical signal and outputs the electrical signal to the corresponding light source 120. In performing the voltage conversion, the voltage conversion circuit may alternatively convert the received electrical signal into a voltage inversely related to the electrical signal. Optionally, when the photoelectric conversion unit 131 receives the first optical signal, the first optical signal is converted into a first electrical signal and output to the corresponding brightness adjustment module 150, and the brightness adjustment module 150 converts the first electrical signal into a first voltage; when the photoelectric conversion unit 131 receives the second optical signal, the second optical signal is converted into a second electrical signal, and the second electrical signal is output to the corresponding brightness adjustment module 150, and the brightness adjustment module 150 converts the second electrical signal into a second voltage. The light intensity of the first optical signal is smaller than that of the second optical signal, the first electric signal is smaller than that of the second electric signal, and the first voltage is larger than the second voltage. The display panel of this embodiment further includes a brightness adjustment module 150, where the brightness adjustment module 150 can perform voltage conversion on the electrical signal output by the photoelectric conversion unit 131, and optionally, the converted voltage is greater than the electrical signal input to the brightness adjustment module 150, so as to ensure that the brightness adjustment module 150 can drive the light source 120; when the brightness of the light source is weaker, the light source can be adjusted to have larger brightness through the brightness adjusting module 150, so that the brightness of the light reaching the fingerprint identification module is improved, and the sensitivity of fingerprint identification is ensured; and when guaranteeing that the light brightness of fingerprint reflection is stronger, can have less luminance through luminance adjustment module 150 adjustment light source, and then save display panel's consumption.
With continued reference to fig. 1 to 9, based on the above technical solution, optionally, the light emitting surface of the light source 120 is parallel to the side 113 where the light source 120 is located; further, the light emitted from the light source 120 is ensured to enter the display module 110 parallel to the light emitting surface of the display panel, so that the light emitted from the light source 120 is reflected and refracted in the display module 110 to reach the fingerprint recognition module 140.
Fig. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention, referring to fig. 10, in another alternative embodiment of the present invention, an angle a between a light emitting surface of a light source 120 and a side 113 where the light source 120 is located is an acute angle. Specifically, the angle a between the light emitting surface of the light source 120 and the side 113 where the light source 120 is located is an acute angle, so that the light direction emitted from the light source 120 can be obliquely directed to the fingerprint recognition module 140 of the display panel, and further, the light emitted by the light source 120 can reach the fingerprint recognition module 140 more, so that the light brightness of the fingerprint recognition area FA during fingerprint recognition is further improved, and the sensitivity of fingerprint recognition is further improved.
Fig. 11 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 11, optionally, a display module 110 includes an array substrate 115, a light emitting device layer 114, a packaging layer 1161, a polarizer 1162, and a cover plate 1163 stacked together; the light source 120 is located on at least one side 113 of at least one of the array substrate 115, the light emitting device layer 114, the encapsulation layer 1161, the polarizer 1162, and the cover plate 1163. Wherein the encapsulation layer 1161, polarizer 1162, and cover plate 1163 may be included in the light-transmissive film layer assembly 116.
Optionally, the light source 120 is located on at least one side 113 of the cover plate. Specifically, the thickness of the cover plate is thicker, the cover plate transmits light, and the light source 120 is arranged on the side surface 113 of the cover plate, so that on one hand, the area where the light source 120 is arranged is sufficient, and on the other hand, the light emitted by the light source 120 is ensured to enter the display module 110 along the cover plate.
The embodiment of the invention also provides a display device, and fig. 12 is a schematic structural diagram of the display device provided by the embodiment of the invention. The display device may be a mobile phone, a computer, a tablet computer, a smart wearable device, or other electronic devices with display functions, and fig. 12 schematically illustrates a case where the display device 200 is a mobile phone. The display device provided by the embodiment of the invention comprises the display panel provided by any of the embodiments of the invention, so that the display device has the corresponding structure and beneficial effects of the display panel, and the description is omitted.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (17)
1. A display panel, wherein the display panel includes a fingerprint recognition area, the display panel further comprising:
The display module comprises a light-emitting surface, a backlight surface and at least one side surface, wherein the light-emitting surface and the backlight surface are opposite to each other, and the side surface is connected with the light-emitting surface and the backlight surface; the display module comprises a plurality of film layers, wherein the plurality of film layers comprise light-transmitting film layers, and the plurality of film layers comprise light-emitting device layers;
at least one light source located on at least one side of the display module;
And the control module is electrically connected with each light source and is used for controlling at least one light source to be lightened in the fingerprint identification stage so as to enable the at least one light source to be lightened to emit light to the fingerprint identification area of the display module.
2. The display panel according to claim 1, wherein the control module includes at least one photoelectric conversion unit, the photoelectric conversion units are located on a backlight side of the light emitting device layer and located in the fingerprint recognition area, each of the photoelectric conversion units is connected to at least one of the light sources, and the photoelectric conversion units are configured to convert a light signal received by the photoelectric conversion unit into an electrical signal and output the electrical signal to the corresponding connected light source, so that the light source is turned on.
3. The display panel according to claim 1, wherein the display panel comprises at least two light sources, the control module comprises at least two photoelectric conversion units and at least two output control units, each photoelectric conversion unit is connected with one light source through one output control unit, and the photoelectric conversion unit is located on the backlight side of the light emitting device layer and is located in the fingerprint identification area;
The photoelectric conversion unit is used for converting the optical signal received by the photoelectric conversion unit into an electric signal; the output control unit is used for transmitting the electric signal obtained by turning the photoelectric conversion unit to the light source correspondingly connected after receiving the conduction control signal of the fingerprint identification module.
4. A display panel according to claim 3, wherein the fingerprint recognition module is configured to output, in the fingerprint recognition stage, a turn-on control signal to the output control unit corresponding to the light source closest to the position of the fingerprint recognition module where the reflected light is received according to the position where the reflected light is received.
5. The display panel according to any one of claims 1 to 4, wherein,
The display panel comprises a first light source and a second light source, and the first light source and the second light source are arranged on a first side face and a second side face which are opposite to each other of the display module.
6. The display panel of claim 5, wherein a vertical distance between the first side and the second side is smaller than a vertical distance between a third side and a fourth side, the third side and the fourth side being two sides connecting the first side and the second side, the third side being opposite the fourth side.
7. The display panel of claim 6, wherein the first light source and the second light source are positioned at positions corresponding to the fingerprint recognition area.
8. The display panel of claim 7, further comprising a third light source located on a third side of the display module.
9. The display panel of claim 8, wherein the third side is at a smaller vertical distance from the fingerprint recognition area than the fourth side.
10. The display panel of claim 8, wherein the third light source is located at a position corresponding to the fingerprint recognition area.
11. The display panel according to claims 2-4, wherein the photoelectric conversion unit is specifically configured to output an electrical signal for controlling the brightness of the light source in negative correlation with the light intensity according to the received light intensity.
12. The display panel according to claim 11, further comprising a brightness adjustment module connected between the photoelectric conversion unit and the corresponding light source, the brightness adjustment module configured to output a first voltage to the connected light source after receiving a first electrical signal, and configured to output a second voltage to the light source after receiving a second electrical signal, wherein a light intensity of the corresponding received light signal when the photoelectric conversion unit outputs the first electrical signal is smaller than a light intensity of the corresponding received light signal when the second electrical signal is output, and the first voltage is greater than the second voltage.
13. The display panel according to claim 1, wherein the light-emitting surface of the light source is parallel to a side surface on which the light source is located;
or the angle between the light-emitting surface of the light source and the side surface of the light source is an acute angle.
14. The display panel according to claim 1, wherein the display module comprises an array substrate, a light emitting device layer, a packaging layer, a polarizer and a cover plate which are stacked;
the light source is positioned on at least one side surface of at least one of the array substrate, the light emitting device layer, the packaging layer, the polaroid and the cover plate.
15. The display panel of claim 14, wherein the light source is located on at least one side of the cover plate.
16. The display panel of claim 1 or 14, further comprising a fingerprint recognition module comprising a fingerprint recognition device located in the array substrate or on a side of the array substrate remote from the light emitting device layer.
17. A display device comprising the display panel of any one of claims 1-16.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019041215A1 (en) * | 2017-08-31 | 2019-03-07 | 上海箩箕技术有限公司 | Display module |
| CN110174794A (en) * | 2019-06-28 | 2019-08-27 | 京东方科技集团股份有限公司 | Display device, liquid crystal display panel and its driving method |
| CN111596489A (en) * | 2020-06-30 | 2020-08-28 | 厦门天马微电子有限公司 | Backlight module, display module and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019041215A1 (en) * | 2017-08-31 | 2019-03-07 | 上海箩箕技术有限公司 | Display module |
| CN110174794A (en) * | 2019-06-28 | 2019-08-27 | 京东方科技集团股份有限公司 | Display device, liquid crystal display panel and its driving method |
| CN111596489A (en) * | 2020-06-30 | 2020-08-28 | 厦门天马微电子有限公司 | Backlight module, display module and electronic equipment |
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