CN108287634A - Touch display panel, display device and driving method of touch display panel - Google Patents
Touch display panel, display device and driving method of touch display panel Download PDFInfo
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- CN108287634A CN108287634A CN201810082259.3A CN201810082259A CN108287634A CN 108287634 A CN108287634 A CN 108287634A CN 201810082259 A CN201810082259 A CN 201810082259A CN 108287634 A CN108287634 A CN 108287634A
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- 238000001514 detection method Methods 0.000 claims abstract description 125
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- 238000003825 pressing Methods 0.000 claims abstract description 38
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- 239000003990 capacitor Substances 0.000 claims description 6
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- 239000010408 film Substances 0.000 description 9
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- 238000005516 engineering process Methods 0.000 description 3
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- 238000005286 illumination Methods 0.000 description 2
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- 238000004020 luminiscence type Methods 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/40—OLEDs integrated with touch screens
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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
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
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Abstract
The invention discloses a touch display panel, a display device and a driving method of the touch display panel, which belong to the technical field of display and comprise the following steps: the display device comprises a display substrate, a control unit, a fingerprint identification unit and an auxiliary light source; when the touch display panel executes a fingerprint identification function, a finger presses the touch display panel to form a pressing area on the touch display panel; the touch display panel comprises a detection area and a lighting area, wherein the detection area is at least a partial area of the pressing area, and the lighting area is positioned outside the detection area; the control unit controls the auxiliary light source in the lighting area to be turned on and the auxiliary light source in the detection area to be turned off; the light emitted by the auxiliary light source in the lighting area is reflected by the inside of the finger to form reflected light which is incident to the fingerprint identification unit so as to carry out fingerprint identification. Compared with the prior art, the fingerprint identification precision can be improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a touch display panel, a display device, and a driving method of the touch display panel.
Background
With the development of display technology, the integration of fingerprint recognition function in the display panel has become one of important research and development directions.
Referring to fig. 1, in a display panel provided by the prior art, when fingerprint recognition is performed on a substrate 5, an identification light source 1, a light-sensitive fingerprint recognition unit 2 and an angle limiting film 3 which are disposed on the substrate 5, a finger covering area generally includes a recognition area, the identification light source 1 in the recognition area emits light, the identification light source 1 can emit light L, and the light-sensitive fingerprint recognition unit 2 can perform fingerprint recognition according to light reflected to the light-sensitive fingerprint recognition unit 2 through a surface of a touch main body 4 to obtain fingerprint information in the recognition area.
The touch body 4 is usually a finger, the fingerprint is composed of a series of ridges 41 and valleys 42 on the skin surface of the finger tip, and the light intensities reflected by the ridges 41 and the valleys 42 received by the light-sensing fingerprint identification unit 2 are different due to the different distances from the ridges 41 and the valleys 42 to the fingerprint identification unit, so that the magnitudes of current signals converted from the reflected light formed at the positions of the ridges 41 and the reflected light formed at the positions of the valleys 42 are different, and the fingerprint identification can be performed according to the magnitudes of the current signals. Generally, at the position of the ridge 41, the reflectance of the light L is low due to the close contact of the ridge 41 and the display panel, and the reflectance of the light L is high at the position of the valley 42.
In the prior art, when the finger is dry, when the contact of the display panel is not good in the local area of the finger, the ridge 41, the valley 42 and the display panel are not in close contact, and the light L emitted by the identification light source 1 has high reflectivity at the position corresponding to the ridge 41 and the valley 42. Therefore, at the position corresponding to the ridge 41, the reflectance of the light L is reduced inconspicuously, and the fingerprint recognized by the display panel is unclear or discontinuous, resulting in a drop in the fingerprint recognition accuracy of the display panel.
Disclosure of Invention
In view of the foregoing, the present invention provides a touch display panel, a display device and a driving method of the touch display panel.
The invention provides a touch display panel, comprising: the display device comprises a display substrate, a control unit, a fingerprint identification unit and an auxiliary light source; wherein, the control unit is electrically connected with the auxiliary light source; when the touch display panel executes a fingerprint identification function, a finger presses the touch display panel to form a pressing area on the touch display panel; the touch display panel comprises a detection area and a lighting area, wherein the detection area is at least a partial area of the pressing area, and the lighting area is positioned outside the detection area; the control unit controls the auxiliary light source in the lighting area to be turned on and the auxiliary light source in the detection area to be turned off; the light emitted by the auxiliary light source in the lighting area is reflected by the inside of the finger to form reflected light which is incident to the fingerprint identification unit so as to carry out fingerprint identification.
The invention provides a display device which comprises a touch display panel provided by the invention.
The invention also provides a driving method of the touch display panel, wherein the touch display panel comprises a display substrate, a fingerprint identification unit and an auxiliary light source; the driving method comprises a fingerprint identification stage; in the fingerprint identification stage, a finger presses the touch display panel to form a pressing area on the touch display panel; the touch display panel comprises a detection area and a lighting area, wherein the detection area is at least a partial area of the pressing area, and the lighting area is positioned outside the detection area; the auxiliary light source in the lighting area is turned on, and the auxiliary light source in the detection area is turned off; the light emitted by the auxiliary light source in the lighting area is reflected by the inside of the finger to form reflected light which is incident to the fingerprint identification unit so as to carry out fingerprint identification.
Compared with the prior art, the touch display panel, the display device and the driving method of the touch display panel provided by the invention at least realize the following beneficial effects: when the touch display panel provided by the invention executes the fingerprint identification function, the control unit controls the auxiliary light source in the lighting area to be turned on and the auxiliary light source in the detection area to be turned off. After partial light emitted by the auxiliary light source in the lighting area irradiates the finger, because the finger is internally provided with structures such as capillary vessels, the light can be reflected in multiple directions inside the finger to form reflected light to be emitted, so that the finger can be regarded as a luminous body, and the light emitted by the finger is the reflected light. Because the fingerprint is by being located a series of ridges and valleys on finger tip skin surface and constitute, because ridge and valley are different to the distance of fingerprint identification unit, the light intensity of the reflection light that ridge and valley "sent" that fingerprint identification unit received is different for the current signal size that is converted by the reflection light that "sends" in the position of ridge and the reflection light that "sends" in the position department of valley is different, and then can carry out fingerprint identification according to current signal size. When the finger is dry and the contact between the ridge in the local area of the finger and the upper surface of the touch display panel is poor, the fingerprint identification unit can still identify the fingerprint information in the detection area. Compared with the prior art, the fingerprint identification precision of the touch display panel can be improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel provided in the prior art;
fig. 2 is a schematic plan view illustrating a touch display panel according to an embodiment of the present invention;
FIG. 3 is a schematic partial cross-sectional view of the touch display panel shown in FIG. 2;
FIG. 4 is a schematic diagram of another partial cross-sectional structure of the touch display panel shown in FIG. 2;
fig. 5 is a schematic partial cross-sectional view of another touch display panel according to an embodiment of the invention;
fig. 6 is a schematic view of a partial plan structure of another touch display panel according to an embodiment of the invention;
fig. 7 is a schematic partial plan view of another touch display panel according to an embodiment of the present invention;
fig. 8 is a schematic partial plan view of another touch display panel according to an embodiment of the present invention;
fig. 9 is a schematic partial cross-sectional view of another touch display panel according to an embodiment of the invention;
FIG. 10 is a schematic structural diagram of a fingerprint identification unit according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a film layer of a fingerprint identification unit 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
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 2 and fig. 3, fig. 2 is a schematic plan view of a touch display panel according to an embodiment of the invention, and fig. 3 is a schematic partial cross-sectional view of the touch display panel shown in fig. 2. The present embodiment provides a touch display panel, including: a display substrate 10, a control unit 11, a fingerprint recognition unit 20, and an auxiliary light source 30; wherein, the control unit 11 is electrically connected with the auxiliary light source 30; when the touch display panel executes the fingerprint identification function, a finger presses the touch display panel to form a pressing area 40 on the touch display panel; the touch display panel comprises a detection area 50 and a lighting area 60, wherein the detection area 50 is at least a partial area of the pressing area 40, and the lighting area 60 is positioned outside the detection area 50; the control unit 11 controls the auxiliary light source 30 in the lighting area 60 to be turned on and the auxiliary light source 30 in the detection area 50 to be turned off; the light emitted from the auxiliary light source 30 in the lighting area 60 is reflected by the inside of the finger to form reflected light, and the reflected light is incident on the fingerprint identification unit 20 to perform fingerprint identification.
In the touch display panel provided in this embodiment, the display substrate 10 has a function of displaying an image, for example, optionally, the display substrate 10 may include a plurality of pixels (not shown in the figure). Alternatively, the display substrate 10 may be an organic light emitting diode display panel, which is not particularly limited in this embodiment. Optionally, the display substrate 10 includes a substrate 00, and the substrate 00 may be hard, for example, made of a glass material, or flexible, for example, made of a resin material, which is not limited in this embodiment.
The touch display panel provided by the embodiment further includes a fingerprint identification unit 20 and an auxiliary light source 30. The fingerprint identification unit 20 may identify fingerprint information according to the received light, and the auxiliary light source 30 may provide light required for fingerprint identification. In the embodiments shown in fig. 2 and fig. 3, only the fingerprint identification unit 20 is disposed outside the display substrate 10 and the auxiliary light source 30 is disposed inside the display substrate 10 for illustration, alternatively, the fingerprint identification unit 20 may be integrated in the display substrate 10, for example, part of the structure of the fingerprint identification unit 20 may be fabricated by using part of the film layers of the display substrate 10; alternatively, the auxiliary light source 30 may be disposed outside the display substrate 10, for example, the auxiliary light source 30 is disposed on a side of the substrate 00 facing away from the finger F. The present embodiment is not particularly limited with respect to the specific positions of the fingerprint identification unit 20 and the auxiliary light source 30.
Wherein, the control unit 11 is electrically connected to the auxiliary light source 30, and the control unit 11 can transmit an electrical signal to the auxiliary light source 30 to control whether the auxiliary light source 30 emits light. Optionally, the control unit 11 is an integrated circuit chip (IC). Alternatively, the control unit 11 is an electric circuit formed in the display substrate 10. The present embodiment is not limited to the specific structure of the control unit 11.
When the touch display panel provided by the embodiment performs the fingerprint identification function, the finger F presses the touch display panel to form a pressing area 40 on the touch display panel, specifically, the pressing area 40 is an area covered by the finger F on the upper surface 101 of the touch display panel. It is understood that the finger F in the pressing area 40 may not be in full contact with the upper surface 101 of the touch display panel due to finger dryness or the like.
The touch display panel includes a detection area 50, and the detection area 50 is at least a partial area of the pressing area 40. The detection area 50 is an area where fingerprint information needs to be recognized by the touch display panel. Optionally, as shown in fig. 2 and fig. 3, the detection area 50 is a portion of the pressing area 40, and the touch display panel identifies a corresponding portion of the fingerprint information in the detection area 50. In other alternative implementations, the detection area 50 and the pressing area 40 may also coincide, that is, the detection area 50 is the whole area of the pressing area 40, and the touch display panel identifies the complete fingerprint information in the pressing area 50.
The touch display panel further includes a lighting area 60, and the lighting area 60 is located outside the detection area 50, that is, the lighting area 60 and the detection area 50 are not overlapped. When the touch display panel provided by the embodiment executes the fingerprint identification function, the control unit 11 controls the auxiliary light source 30 in the lighting area 60 to be turned on and the auxiliary light source 30 in the detection area 50 to be turned off. After a part of the light L1 emitted by the auxiliary light source 30 in the lighting region 60 enters the finger F, because the finger F has a structure such as a capillary vessel, the light L1 is reflected in multiple directions inside the finger to form reflected light L2, and the reflected light L2 is emitted, so that the finger F can be regarded as a "light emitter", and the light "emitted" by the finger F is the reflected light L2.
Since the fingerprint is composed of a series of ridges F1 and valleys F2 on the skin surface of the tip of the finger, the ridges F1 protrude outward of the finger and the valleys F2 are concave inward of the finger. Therefore, the distances from the ridge F1 and the valley F2 to the fingerprint identification unit are different, and the intensity of the reflected light L2 "emitted" by the ridge F1 and the valley F2 received by the fingerprint identification unit 20 is different, so that the magnitudes of the current signals converted by the reflected light L2 "emitted" at the position of the ridge F1 and the reflected light L2 "emitted" at the position of the valley F2 are different, and fingerprint identification can be performed according to the magnitudes of the current signals. The reflected light L2 "emitted" by the ridges F1 and the valleys F2 received by the fingerprint identification unit 20 has different light intensities for the following two reasons.
First, the ridge F1 forms a physical structure like a convex lens since the ridge F1 protrudes outward from the finger; the valley F2 is concave inward of the finger and the valley F2 forms a concave lens-like physical structure. When the light L1 is reflected in multiple directions inside the finger to form the reflected light F2 and then exits, the light converges at the position of the ridge F1, so the intensity of the reflected light F2 "emitted" by the ridge F1 is greater, and the light scatters at the position of the valley F2, so the intensity of the reflected light F2 "emitted" by the valley F2 is less. Therefore, the intensity of the light reaching the fingerprint recognition unit 20 of the reflected light ray L2 "issued" at the position of the ridge F1 is large, and the intensity of the light reaching the fingerprint recognition unit 20 of the reflected light ray L2 "issued" at the position of the valley F2 is small.
Secondly, light propagates in the air and has light intensity loss, and the farther the light propagates, the greater the light intensity loss, and the closer the light propagates, the smaller the light intensity loss. In the present embodiment, the ridge F1 is closer to the fingerprint identification unit 20, and the intensity of the light reaching the fingerprint identification unit 20 of the reflected light L2 "emitted" at the position of the ridge F1 is greater; the valley F2 is located at a greater distance from the fingerprint recognition unit 20, and the intensity of the light "emitted" at the valley F2 is less that the reflected light L2 reaches the fingerprint recognition unit 20.
Therefore, the touch display panel provided by the embodiment performs fingerprint identification by using the reflected light "emitted" by the ridges F1 and the valleys F2, rather than using the light reflected by the surface of the finger to the light-sensitive fingerprint identification unit in the prior art. Even if the finger F is dry or the ridge F1 and the upper surface 101 of the touch display panel are not in good contact in a partial area of the finger, the fingerprint identification unit 20 can perform fingerprint identification according to the received light intensity difference of the reflected light L2 "emitted" by the ridge F1 and the valley F2. For the reason that the intensity of the reflected light L2 "emitted" at the position of the ridge F1 reaching the fingerprint identification unit 20 is large, and the intensity of the reflected light L2 "emitted" at the position of the valley F2 reaching the fingerprint identification unit 20 is small, please refer to the above description. Thus, fingerprint recognition can be performed in a case where the finger F is dry or the ridge F1 and the upper surface 101 of the touch display panel are not in good contact in a partial area of the finger. Compared with the prior art, the light sensation fingerprint identification unit utilizes the light reflected by the surface of the touch main body to perform fingerprint identification, and the touch display panel provided by the embodiment can improve the fingerprint identification precision of the touch display panel.
In fig. 3, for clarity of the light L1 and the reflected light L2 emitted from the auxiliary light source 30, the light L1 emitted from the auxiliary light source 30 is indicated by a solid line, and the reflected light L2 is indicated by a dot-dash line.
The touch main body may be a palm or the like, besides a finger, and the principles of fingerprint identification and palm print identification are the same, and the touch display panel may also use a palm print to realize the functions of detection and identification.
It should be noted that, in the terminal device where the touch display panel is located, a processing unit may be provided for processing the electrical signal in the touch display panel. For example, the signal processing unit may analyze and calculate the position and size information of the detection region 50 and the lighting region 60 according to the position and size information of the pressing region 40.
It should be noted that, in the touch display panel provided in this embodiment, because the auxiliary light source 30 of the lighting area 60 is located outside the detection area 50, the reflection angle of the light emitted by the auxiliary light source 30 and directly reflected by the finger surface of the detection area 50 is generally large, wherein a part of the light L3 directly reflected by the finger surface will be irradiated outside the detection area, and a part of the light directly reflected by the finger surface will be irradiated into the fingerprint identification unit 20, but the proportion of the light is small, and the light intensity is much smaller than the light L2 "emitted" by the finger F, so the influence on the normal operation of the fingerprint identification unit 20 is small.
Optionally, referring to fig. 4, an angle limiting film 80 may be disposed between the substrate base plate 00 and the fingerprint identification unit 20, the angle limiting film 80 may be capable of filtering out light rays, which are emitted by the auxiliary light source 30 and reflected by the inside of a finger to form a reflected light, and the reflected light is incident into the fingerprint identification unit 20, and an incident angle with respect to the angle limiting film 80 is larger than a transmission angle of the angle limiting film. Since the lighted auxiliary light source 30 is located outside the detection region, the angle of the light emitted by the auxiliary light source 30 and directly reflected by the finger surface is generally large, for example, the light L4 directly reflected by the finger surface has a large reflection angle and cannot pass through the angle limiting film 80. Therefore, the crosstalk phenomenon caused by the light emitted from the auxiliary light source 30 and directly reflected by the surface of the finger irradiating the fingerprint identification unit 20 can be further avoided, and the accuracy and precision of fingerprint identification can be improved.
In some optional implementations, please refer to fig. 5, in which fig. 5 is a schematic partial cross-sectional structure diagram of another touch display panel provided in the embodiment of the present invention. On the basis of the touch display panel provided in any embodiment of the present invention, the touch display panel includes the touch electrode 550, and in combination with fig. 2, the touch electrode 550 is used for identifying the position information of the pressing area 40. The touch electrode 550 receives the touch signal, when a finger approaches or touches the touch display panel, the electrical signal of the touch electrode 550 changes, and the position information of the pressing area 40 can be obtained by analyzing and calculating the variation of the electrical signal of the touch electrode 550. So as to determine the position information of the detection region 50, and improve the speed and accuracy of recognition. It should be noted that, in the terminal device where the touch display panel is located, a processing unit may be provided for processing the electrical signal in the touch display panel. For example, the processing unit may obtain the position information of the pressing area 40 by analyzing and calculating the variation of the electrical signal of the touch electrode 550, and select at least a portion of the pressing area 40 as the corresponding detection area 50 according to an algorithm set by the processing unit.
Optionally, the touch electrode 550 is a self-capacitance touch electrode, or optionally, the touch electrode 550 is a mutual capacitance touch electrode, and the embodiment does not specifically limit the specific shape, size, and working mode of the touch electrode 550.
In fig. 5, only the touch electrode 550 is disposed on the surface of the display substrate 10 for illustration. Alternatively, the touch electrode 550 may be integrated in the display substrate 10, and the specific position of the touch electrode 550 is not particularly limited in this embodiment.
In the touch display panel provided in the embodiment of the present invention, there are various specific setting manners of the shapes and the positions of the lighting regions, and the specific setting manner of the lighting regions is described in this exemplary embodiment of the present invention.
Optionally, referring to fig. 2 and fig. 3, the lighting area 60 is block-shaped and disposed adjacent to the detection area 50 on the touch display panel. Alternatively, the brightness of the auxiliary light source 30 in the lighting area 60 may be set higher, and fewer auxiliary light sources may be used to provide the light intensity required for fingerprint recognition. For example, when the touch display panel displays a screen, the highest brightness is 255 grayscales, and the brightness of the auxiliary light source 30 may be set to be higher than 255 grayscales, such as 500 grayscales and 600 grayscales. In fig. 2, the lighting region 60 is described as an example of a quadrangle, and the lighting region 60 may have various shapes, for example, a polygon such as a circle, an ellipse, a triangle, or a quadrangle, or the lighting region 60 may have a block shape with an irregular shape. Optionally, the area of the lighting region 60 is S1, S1 ≧ 1mm2. The area of the lighting region 60 should not be too small, less than 1mm2In this case, the number of the auxiliary light sources 30 in the lighting area 60 may be too small, the light provided by the lighting area 60 may be weak, the reflected light L2 may be formed by multiple directions of reflection inside the finger, and the fingerprint identification unit 20 may not obtain enough reflected light L2 to identify the fingerprint information, which may result in a decrease in the accuracy of fingerprint identification. In the present embodiment, the lighting region 60 is disposed adjacent to the detection region 50, and specifically, the lighting region 60 and the detection region 50 may share a partial boundary. The distance between the lighting area 60 and the detection area 50 is adjacent, so that light emitted by the auxiliary light source 30 in the lighting area 60 can be irradiated into the finger as much as possible, the light intensity of the reflected light L2 "emitted" by the finger can be increased, the light sensed by the fingerprint identification unit 20 can be increased, and the fingerprint identification precision can be improved.
Optionally, referring to fig. 6, fig. 6 is a partial planar structure panel of another touch display panel provided in the embodiment of the present invention, in the embodiment, the lighting area 60 is disposed around the detection area 50 on the touch display panel. Specifically, the lighting area 60 is an annular-like area and is disposed around the detection area 50, so as to provide sufficient and relatively uniform light for the finger, improve the light intensity of the reflected light L2 "emitted" by the part of the finger at the position of the detection area 50, and further increase the light sensed by the fingerprint identification unit 20, thereby improving the accuracy of fingerprint identification. In the touch display panel provided in the embodiment of the present invention, there are various fingerprint identification modes, and the present invention specifically describes the fingerprint identification modes in an exemplary manner.
Optionally, please refer to fig. 7 for a mode of fingerprint identification, where fig. 7 is a schematic view of a partial planar structure of another touch display panel according to an embodiment of the present invention. In the present embodiment, the detection area 50 is the entire area of the pressing area 40, and optionally, the lighting area 60 is disposed around the detection area 50. The light emitted from the auxiliary light source in the lighting area 60 is reflected by the inside of the finger to form reflected light, and the reflected light is incident on the fingerprint identification unit to perform fingerprint identification, and the fingerprint identification unit can acquire complete fingerprint information in the pressing area 40.
Optionally, please refer to fig. 8 for another mode of fingerprint identification, where fig. 8 is a schematic view of a partial planar structure of another touch display panel according to an embodiment of the present invention. In different frames in the fingerprint identification stage, the relative positions of the detection area 50 and the pressing area 40 are adjusted to obtain the local fingerprint information in different detection areas 50, and then the local fingerprint information in different detection areas 50 is spliced to obtain the whole fingerprint information for fingerprint identification. Specifically, for example, the detection zone 50 may include a first detection zone 501, a second detection zone 502, a third detection zone 503, and a fourth detection zone 504. In different frames in the fingerprint identification stage, the local fingerprint information in the first detection area 501, the second detection area 502, the third detection area 503 and the fourth detection area 504 are respectively identified, and then the first detection area 501, the second detection area 502, the third detection area 503 and the fourth detection area are combinedThe partial fingerprint information stitching in 504 obtains the global fingerprint information in the compression area 40. Optionally, the fingerprint identification unit needs a certain time to sense light for fingerprint identification, for example, the time for identifying each detection region may be 10 frames, 15 frames, or 20 frames, and the specific fingerprint identification time needs to be set according to the specific structure and the working performance of the fingerprint identification unit, which is not limited in this embodiment. Optionally, when fingerprint identification is performed on different detection regions, two adjacent detection regions may be identified at an interval, or at an interval, and the specific setting condition needs to be set according to the specific structure and the working performance of the touch display panel, which is not specifically limited by this embodiment. Specifically, for example, after the identification of the partial fingerprint information in the first detection region 501 is completed, the identification of the partial fingerprint information in the second detection region 502 may be directly performed, or the identification of the partial fingerprint information in the second detection region 502 may be performed after a time interval of 1 frame or more. It can be understood that, in this embodiment, only the example of obtaining the overall fingerprint information by splicing the local fingerprint information in the four detection regions is taken as an example for description, in other optional implementation manners, the overall fingerprint information may be obtained by splicing the local fingerprint information in two, three, or more than five detection regions, which is not specifically limited in this embodiment, and the obtaining manner of the local fingerprint information of each detection region may adopt various structures and manners described in this specification, and is not described herein again. It can be understood that, when the detection area 50 is larger, the distance between the lighting area and the middle area of the detection area is longer, that is, the distance between the lighting area and the middle area 70 of the detection area is longer, therefore, the intensity of the light emitted by the auxiliary light source in the lighting area and incident on the inside of the finger corresponding to the middle area 70 is weaker, which is not beneficial to improving the intensity of the light of the reflected light "emitted" by the part of the fingers at the middle area 70 of the detection area 50, which can reduce the light sensed by the fingerprint identification unit, and reduce the accuracy of fingerprint identification. In this embodiment, only the local fingerprint information and the detection area are obtained in different frames in the fingerprint identification stageThe area of the domain 50 is smaller than the area of the pressing region 40, for example, taking the first detection region 501 as an example, in the fingerprint identification stage, the lighting region is set according to the position of the first detection region 501 according to the foregoing embodiment, so that the lighting region is closer to the finger corresponding to the first detection region 501, and therefore, the intensity of the light ray incident to the inside of the finger from the light ray emitted by the auxiliary light source in the lighting region is stronger, and the method is similarly applicable to other detection regions. This is advantageous for improving the light intensity of the reflected light "emitted" by the part of the fingers in the middle region 70 of the detection region 50, increasing the light intensity difference sensed by the fingerprint identification unit, and improving the accuracy of fingerprint identification. Typically, the area of the pressing area 40 is about 6mm2Optionally, the area of the detection region 50 is S1', 1mm2≤S1’≤4mm2. Because when the detection area 50 is too small, it is less than 1mm2In time, the acquired fingerprint information is less, which is not beneficial to improving the fingerprint identification precision.
It should be noted that in the touch display panel provided in the embodiment of the present invention, there may be a plurality of fingerprint identification modes, and the present invention is not described in detail herein.
In some optional embodiments, please refer to fig. 9, and fig. 9 is a schematic partial cross-sectional structure diagram of another touch display panel according to an embodiment of the present invention. On the basis of the touch display panel provided in any embodiment of the present invention, the display substrate 10 includes a substrate 00 and a plurality of organic light emitting units 301 located on the substrate 00. The Organic Light Emitting unit 301 is an Organic Light Emitting Diode (OLED), and the OLED display technology has the advantages of self-luminescence, wide viewing angle, almost infinite contrast, low power consumption, and high response speed. Optionally, at least one organic light emitting unit 301 is multiplexed as the auxiliary light source 30. In this embodiment, the organic light emitting unit 301 is reused as the auxiliary light source 30, and no additional auxiliary light source is needed, which is beneficial to the light and thin touch display panel.
Optionally, with continued reference to fig. 9, the fingerprint identification unit 20 is located on a side of the substrate 00 away from the organic light emitting unit 301. In this embodiment, after the display substrate 10 is manufactured, the fingerprint identification unit 20 may be disposed on a side of the substrate 00 away from the organic light emitting unit 301, and the fingerprint identification unit 20 may be manufactured separately without affecting the structural configuration inside the display substrate 10, thereby facilitating simplification of the manufacturing process of the touch display panel.
Alternatively, with continued reference to fig. 9, the organic light emitting unit 30 includes an anode 31, a light emitting layer 32 and a cathode 33, wherein the light emitting layer 32 is located between the anode 31 and the cathode 32; the display substrate 10 further includes a pixel defining layer 12; the pixel defining layer 12 includes an opening area 121 and the remaining non-opening area 122, and the organic light emitting unit 30 is located in the opening area 121; the vertical projection of the fingerprint identification unit 20 on the display substrate 10 is located in the non-opening area 122 of the pixel defining layer 12. The opening area 121 of the pixel defining layer 12 is a light emitting area of the display substrate 10, and the non-opening area 122 is a non-light emitting area of the display substrate 10. By arranging the fingerprint identification unit 20 in the non-light-emitting area of the display substrate 10 in the vertical projection of the display substrate 10, the fingerprint identification unit 20 can be arranged in the display area of the touch display panel, the screen occupation ratio of the touch display panel is improved, and the development trend of narrow edge of the display panel is met.
In some optional embodiments, please refer to fig. 10 and 11, in which fig. 10 is a schematic structural diagram of a fingerprint identification unit according to an embodiment of the present invention, and fig. 11 is a schematic film layer diagram of a fingerprint identification unit according to an embodiment of the present invention. On the basis of the touch display panel provided by any embodiment of the invention, the fingerprint identification unit comprises a photosensitive diode D, a storage capacitor C and a thin film transistor T; the anode D1 of the photodiode D is electrically connected with the first electrode of the storage capacitor C, and the cathode D2 of the photodiode D is electrically connected with the second electrode of the storage capacitor C and the source Ts of the thin film transistor T; a grid electrode Tg of the thin film transistor T is electrically connected with a switch control line Gate, and a drain electrode Td is electrically connected with a signal detection line Data; the photodiode D is used to convert light reflected by the touch subject into a current signal.
Optionally, the photodiode D includes a PIN junction D3 between the anode D1 and the cathode D2; the vertical projection of PIN junction D3 on display substrate 10 is located in the light-transmissive region of display substrate 10. Among them, the PIN junction D3 is composed of a P-type semiconductor, an N-type semiconductor, and an intrinsic semiconductor (I-type layer) between the P-type semiconductor and the N-type semiconductor. Specifically, the cathode D2 is formed of opaque metal, and the boundary of the PIN junction D3 does not exceed the boundary of the cathode D2. The anode D1 of the photodiode D is located on the side of the PIN junction D3 away from the display substrate 10. PIN junction D3 has photosensitive properties and has unidirectional conductivity. In the absence of illumination, the PIN junction D3 has a small saturation reverse leakage current, i.e., dark current, when the photodiode D is turned off. When the PIN junction D3 is illuminated, the saturation reverse leakage current of the PIN junction D3 is greatly increased, and a photocurrent is formed and changes along with the change of the incident light intensity.
The invention provides a display device which comprises a touch display panel provided by the invention. Referring to fig. 12, fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention. The display device 1000 provided in fig. 12 includes the touch display panel 1001 according to any one of the embodiments of the present invention. The embodiment of fig. 12 is only an example of a mobile phone, and the display device 1000 is described, it is to be understood that the display device provided in the embodiment of the present invention may be other display devices having a display function, such as a computer, a television, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device provided in the embodiment of the present invention has the beneficial effects of the touch display panel provided in the embodiment of the present invention, and specific descriptions on the touch display panel in the above embodiments may be specifically referred to, and this embodiment is not described herein again.
The present invention provides a driving method of a touch display panel, please refer to fig. 2 and fig. 3 in combination, the touch display panel includes a display substrate 10, a fingerprint identification unit 20 and an auxiliary light source 30; the driving method comprises a fingerprint identification stage; in the fingerprint identification stage, a finger presses the touch display panel to form a pressing area 40 on the touch display panel; the touch display panel comprises a detection area 50 and a lighting area 60, wherein the detection area 50 is at least a partial area of the pressing area 40, and the lighting area 60 is positioned outside the detection area 50; the auxiliary light source in the illumination area 60 is illuminated and the auxiliary light source in the detection area 50 is turned off; the light emitted from the auxiliary light source in the lighting area 60 is reflected by the inside of the finger to form reflected light, and the reflected light is incident on the fingerprint identification unit 20 to perform fingerprint identification.
In the driving method provided by the present embodiment, in the fingerprint identification stage, the auxiliary light source 30 in the lighting area 60 is controlled to be turned on, and the auxiliary light source 30 in the detection area 50 is controlled to be turned off. After a part of the light L1 emitted by the auxiliary light source 30 in the lighting region 60 enters the finger F, because the finger F has a structure such as a capillary vessel, the light L1 is reflected in multiple directions inside the finger to form reflected light L2, and the reflected light L2 is emitted, so that the finger F can be regarded as a "light emitter", and the light "emitted" by the finger F is the reflected light L2. Since the fingerprint is composed of a series of ridges F1 and valleys F2 on the surface of the finger tip skin, and the distances from the ridges F1 and valleys F2 to the fingerprint identification unit are different, the intensity of the reflected light L2 "emitted" by the ridges F1 and valleys F2 received by the fingerprint identification unit 20 is different, so that the magnitude of the current signal converted from the reflected light L2 "emitted" at the position of the ridge F1 and the reflected light L2 "emitted" at the position of the valleys F2 are different, and the fingerprint identification can be performed according to the magnitude of the current signal. Specifically, the ridge F1 has a smaller distance from the fingerprint recognition unit 20, the reflected light ray L2 "emitted" at the position of the ridge F1 has a larger light intensity, and the reflected light ray L2 "emitted" at the position of the valley F2 has a smaller light intensity. Therefore, when the finger F is dry and the ridge F1 and the upper surface 101 of the touch display panel are not in good contact in the local area of the finger, the difference between the intensities of the reflected light received by the fingerprint identification unit 20 and "emitted" by the ridge F1 and the valley F2 is also less affected, and the fingerprint identification unit 20 can still identify the fingerprint information in the detection area 50. Compared with the prior art, the fingerprint identification precision of the touch display panel can be improved.
In the driving method provided by the embodiment of the present invention, there are various fingerprint recognition modes, and the present invention specifically describes the fingerprint recognition modes in this example.
Optionally, referring to fig. 7, in this embodiment, the detection area 50 is the entire area of the pressing area 40, and optionally, the lighting area 60 is disposed around the detection area 50. The light emitted from the auxiliary light source in the lighting area 60 is reflected by the inside of the finger to form reflected light, and the reflected light is incident on the fingerprint identification unit to perform fingerprint identification, and the fingerprint identification unit can acquire complete fingerprint information in the pressing area 40.
Optionally, referring to fig. 8, in another mode of fingerprint identification, in different frames in the fingerprint identification stage, the local fingerprint information in different detection regions 50 is obtained by adjusting the relative positions of the detection region 50 and the pressing region 40, and then the local fingerprint information in different detection regions 50 is spliced to obtain the overall fingerprint information for fingerprint identification. Specifically, for example, the detection zone 50 may include a first detection zone 501, a second detection zone 502, a third detection zone 503, and a fourth detection zone 504. In different frames in the fingerprint identification stage, the local fingerprint information in the first detection area 501, the second detection area 502, the third detection area 503 and the fourth detection area 504 is respectively identified, and then the whole fingerprint information in the pressing area 40 is obtained by splicing the local fingerprint information in the first detection area 501, the second detection area 502, the third detection area 503 and the fourth detection area 504. It can be understood that, in this embodiment, only the example of obtaining the overall fingerprint information by splicing the local fingerprint information in the four detection regions is taken as an example for description, in other optional implementation manners, the overall fingerprint information may be obtained by splicing the local fingerprint information in two, three, or more than five detection regions, which is not specifically limited in this embodiment, and the obtaining manner of the local fingerprint information of each detection region may adopt various structures and manners described in this specification, and is not described herein again.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (14)
1. A touch display panel, comprising:
the display device comprises a display substrate, a control unit, a fingerprint identification unit and an auxiliary light source; wherein,
the control unit is electrically connected with the auxiliary light source;
when the touch display panel executes a fingerprint identification function, a finger presses the touch display panel to form a pressing area on the touch display panel;
the touch display panel comprises a detection area and a lighting area, wherein the detection area is at least a partial area of the pressing area, and the lighting area is positioned outside the detection area;
the control unit controls the auxiliary light source in the lighting area to be turned on and the auxiliary light source in the detection area to be turned off;
and the light rays emitted by the auxiliary light source in the lighting area are reflected by the inside of the finger to form reflected light to enter the fingerprint identification unit so as to carry out fingerprint identification.
2. The touch display panel according to claim 1,
the touch display panel comprises a touch electrode, and the touch electrode is used for identifying the position information of the pressing area.
3. The touch display panel of claim 1,
the lighting area is in a block shape and is arranged adjacent to the detection area on the touch display panel.
4. The touch display panel of claim 3,
the area of the lighting area is S1, and S1 is more than or equal to 1mm2。
5. The touch display panel of claim 1,
the lighting area is arranged on the touch display panel around the detection area.
6. The touch display panel of claim 1, wherein:
in different frames in the fingerprint identification stage, the relative positions of the detection area and the pressing area are adjusted to acquire local fingerprint information in different detection areas, and then the local fingerprint information in the different detection areas is spliced to acquire integral fingerprint information for fingerprint identification.
7. The touch display panel of claim 5, wherein:
the area of the detection region is S1', 1mm2≤S1’≤4mm2。
8. The touch display panel of claim 1,
the display substrate includes a base substrate, and a plurality of organic light emitting units on the base substrate.
9. The touch display panel of claim 8,
at least one of the organic light emitting units is multiplexed as the auxiliary light source.
10. The touch display panel of claim 8,
the fingerprint identification unit is positioned on one side of the substrate base plate, which is far away from the organic light-emitting unit.
11. The touch display panel of claim 1, wherein:
the fingerprint identification unit comprises a photosensitive diode, a storage capacitor and a thin film transistor;
the anode of the photosensitive diode is electrically connected with the first electrode of the storage capacitor, and the cathode of the photosensitive diode is electrically connected with the second electrode of the storage capacitor and the source electrode of the thin film transistor; the grid electrode of the thin film transistor is electrically connected with the switch control line, and the drain electrode of the thin film transistor is electrically connected with the signal detection line;
the photosensitive diode is used for converting light reflected by the finger into a current signal.
12. The touch display panel of claim 8, wherein:
the organic light emitting unit includes an anode, a light emitting layer and a cathode, the light emitting layer being located between the anode and the cathode;
the display substrate further comprises a pixel defining layer; the pixel defining layer includes an open region and remaining non-open regions, the organic light emitting unit being located within the open region; the vertical projection of the fingerprint identification unit on the display substrate is positioned in the non-opening area of the pixel definition layer.
13. A display device comprising the touch display panel according to any one of claims 1 to 12.
14. A driving method of a touch display panel is characterized in that,
the touch display panel comprises a display substrate, a fingerprint identification unit and an auxiliary light source; wherein,
the driving method comprises a fingerprint identification stage;
in the fingerprint identification stage, a finger presses the touch display panel to form a pressing area on the touch display panel;
the touch display panel comprises a detection area and a lighting area, wherein the detection area is at least a partial area of the pressing area, and the lighting area is positioned outside the detection area;
the auxiliary light source in the lighting area is turned on, and the auxiliary light source in the detection area is turned off;
and the light rays emitted by the auxiliary light source in the lighting area are reflected by the inside of the finger to form reflected light to enter the fingerprint identification unit so as to carry out fingerprint identification.
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