CN112883903B - Display panel driving method and display device - Google Patents
Display panel driving method and display device Download PDFInfo
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- CN112883903B CN112883903B CN202110272451.0A CN202110272451A CN112883903B CN 112883903 B CN112883903 B CN 112883903B CN 202110272451 A CN202110272451 A CN 202110272451A CN 112883903 B CN112883903 B CN 112883903B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
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- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
The embodiment of the invention discloses a driving method of a display panel and a display device, wherein the driving method comprises the steps of driving a fingerprint identification module according to reference integral time and acquiring an average voltage value of a fingerprint image; updating the reference integral time according to the average voltage value of the fingerprint image, and driving the fingerprint identification module to perform fingerprint identification according to the updated reference integral time; wherein, the reference integral time represents the collection integral time that the fingerprint identification module goes on touching the reflection light of main part. By adopting the technical scheme, the reference integral time is dynamically adjusted according to the average voltage value of the fingerprint image, the updated reference integral time is used for driving the fingerprint identification module to carry out fingerprint identification, the reference integral time is matched with the ambient temperature, the fingerprint image acquisition quality is high, and the fingerprint image identification precision is high; in addition, the driving method provided by the embodiment of the invention can realize dynamic adjustment of the reference integration time without adding other electronic devices, and is simple and efficient.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel driving method and a display device.
Background
With the widespread use of electronic devices (such as mobile phones, tablet computers, and the like), the applications that can be supported by electronic devices are increasing, the functions are becoming more and more powerful, and the electronic devices are developing towards diversification and personalization directions, and becoming indispensable electronic articles for use in the life of users.
Fingerprint identification technology has also become the standard matching technology for electronic devices. The fingerprint identification time sequence in the prior art is fixed, namely the fingerprint acquisition time is the same under different environmental temperatures, so that the fingerprint image acquisition quality is influenced, and the fingerprint identification precision is influenced.
Disclosure of Invention
The invention provides a driving method of a display panel and a display device, and solves the technical problem that fingerprint identification precision is low due to the fact that fingerprint acquisition time is the same under different environmental temperatures in the prior art.
In a first aspect, an embodiment of the present invention provides a method for driving a display panel, including:
driving a fingerprint identification module according to the reference integral time, and acquiring an average voltage value of a fingerprint image;
updating the reference integral time according to the average voltage value of the fingerprint image, and driving the fingerprint identification module to perform fingerprint identification according to the updated reference integral time;
and the reference integration time represents the acquisition integration time of the reflected light of the touch main body by the fingerprint identification module.
In a second aspect, an embodiment of the present invention further provides a display device, which includes a display panel and a driving device, where the driving device drives the display panel by using the driving method of the first aspect.
According to the driving method and the display device of the display panel, the fingerprint identification module is driven according to the reference integral time to obtain the average voltage value of the fingerprint image, the reference integral time is updated according to the average voltage value of the fingerprint image, and the fingerprint identification module is driven according to the updated reference integral time to carry out fingerprint identification. In addition, the driving method provided by the embodiment of the invention can realize dynamic adjustment of the reference integration time without adding other electronic devices, and is simple and efficient.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a driving method of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a fingerprint identification unit according to an embodiment of the present invention;
FIG. 4 is a timing diagram illustrating operation of the fingerprint identification unit of FIG. 3;
FIG. 5 is a flowchart illustrating another driving method for a display panel according to an embodiment of the present invention;
FIG. 6 is a flow chart of another driving method of a display panel according to an embodiment of the present invention;
FIG. 7 is a timing diagram illustrating a driving method of a display panel according to the prior art;
FIG. 8 is a driving timing diagram illustrating a driving method of a display panel according to an embodiment of the present invention;
FIG. 9 is a timing diagram illustrating a driving sequence of another driving method for a display panel according to an embodiment of the present invention;
FIG. 10 is a timing diagram illustrating a driving sequence of another driving method for a display panel according to an embodiment of the present invention;
FIG. 11 is a flowchart illustrating another driving method of a display panel according to an embodiment of the present invention;
fig. 12 is a schematic flowchart of another driving method for a display panel according to an embodiment of the invention;
FIG. 13 is a schematic diagram of a driving timing sequence of another driving method for a display panel according to an embodiment of the present invention
Fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Biometric identification needs to cope with different environments, such as low or high temperatures. In the case of fingerprint recognition, a human finger becomes dry in a low-temperature environment, which results in a small difference in reflection amount between a valley and a ridge. The valley-ridge voltage difference Δ V is i × t/C, where i represents the output current of the fingerprint identification circuit, t represents the integration time, C represents the storage capacitor in the fingerprint identification circuit, and i is decreased because the brightness difference of the valley-ridge reflection is decreased under the same backlight brightness and storage capacitor, and t needs to be increased, that is, the integration time needs to be increased, in order to obtain a better fingerprint effect; under a high-temperature environment, because the leakage current of the photodiode of the fingerprint identification circuit is increased, all the valley-ridge charges are extinguished at the same time t, and therefore, the smaller t, namely the smaller integration time is required. Therefore, for fingerprint identification, the integration time required by different environmental temperatures is different, and the fingerprint identification time sequence in the prior art is fixed, namely the fingerprint acquisition time is the same under different environmental temperatures, so that the fingerprint image acquisition quality and the fingerprint identification precision are influenced.
Based on the above technical problem, an embodiment of the present invention provides a driving method for a display panel, including: driving a fingerprint identification module according to the reference integral time, and acquiring an average voltage value of a fingerprint image; updating the reference integral time according to the average voltage value of the fingerprint image, and driving the fingerprint identification module to perform fingerprint identification according to the updated reference integral time; and the reference integration time represents the acquisition integration time of the reflected light of the touch main body by the fingerprint identification module. By adopting the technical scheme, the reference integral time is dynamically adjusted according to the average voltage value of the fingerprint image, the updated reference integral time is used for driving the fingerprint identification module to carry out fingerprint identification, the reference integral time is matched with the ambient temperature, the fingerprint image acquisition quality is high, and the fingerprint image identification precision is high; in addition, the driving method provided by the embodiment of the invention can realize dynamic adjustment of the reference integration time without adding other electronic devices, and is simple and efficient.
The above is the core idea of the embodiment of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and as shown in fig. 1, the display panel according to the embodiment of the present invention includes a plurality of pixel units 11 and a fingerprint identification module 12, where the fingerprint identification module 12 includes a plurality of fingerprint identification units 121 arranged in a matrix. In fig. 1, only the fingerprint identification modules 12 are disposed in each area of the display panel as an example to illustrate that the display panel provided by the embodiment of the present invention can realize full-screen fingerprint identification; furthermore, a fingerprint identification module may be disposed in only a partial area of the display panel, for example, the fingerprint identification module is disposed near a lower frame of the display panel, which is not limited in the embodiments of the present invention. It should be noted that, in fig. 1, only three sub-pixels 111 are included in each pixel unit 11, and each pixel unit 11 corresponds to one fingerprint identification unit 121 as an example for description, and the number of sub-pixels included in each pixel unit 11 and the corresponding relationship between the number of pixel units 11 and the number of fingerprint identification units 121 are not limited in the embodiment of the present invention.
Fig. 2 is a schematic flowchart of a driving method of a display panel according to an embodiment of the present invention, and as shown in fig. 2, the driving method of the display panel according to the embodiment of the present invention includes:
and S110, driving the fingerprint identification module according to the reference integration time, and acquiring an average voltage value of the fingerprint image.
Exemplary, the fingerprint identification module can include the fingerprint identification unit that a plurality of matrixes were arranged, and every fingerprint identification unit can discern partial fingerprint image, and the fingerprint identification module can combine the partial fingerprint image that a plurality of fingerprint identification units discerned, obtains complete fingerprint image. Further, the acquiring of the average voltage value of the fingerprint image may be determining the average voltage value of the fingerprint image from partial fingerprint images acquired by the plurality of fingerprint identification units.
Fig. 3 is a circuit schematic diagram of a fingerprint identification unit 121 according to an embodiment of the present invention, and as shown in fig. 3, the fingerprint identification unit 121 includes a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, a first capacitor C1, and a photodiode D1. A control terminal of the first thin film transistor T1 is electrically connected to the control circuit through a Reset control signal line Reset, a first terminal of the first thin film transistor T1 is electrically connected to the control circuit through a Reset voltage signal line VDD, a second terminal of the first thin film transistor T1 is electrically connected to a cathode of the photodiode D1, an anode of the photodiode D1 is electrically connected to the control circuit through a common voltage signal line Vbias, and the first capacitor C1 is connected in parallel to the photodiode D1. A control terminal of the second thin film transistor T2 is electrically connected to a second terminal of the first thin film transistor T1, a first terminal of the second thin film transistor T2 is electrically connected to the control circuit through a reset voltage signal line VDD, a second terminal of the second thin film transistor T2 is electrically connected to a first terminal of the third thin film transistor T3, a control terminal of the third thin film transistor T3 is electrically connected to the control circuit through a fingerprint identification scan line Select, and a second terminal of the third thin film transistor T3 is electrically connected to the control circuit through a fingerprint identification data read line Vout. Accordingly, the fingerprint identification phase FPR corresponding to the fingerprint identification unit 121 sequentially includes a reset and charge phase, a fingerprint acquisition phase, and a data reading phase, and the fingerprint identification unit 121 is in an integration phase between the reset and charge phase and the data reading phase, i.e. in the fingerprint acquisition phase.
Fig. 4 is a timing diagram illustrating the operation of the fingerprint recognition unit shown in fig. 3, and the operation of the fingerprint recognition unit will now be described in detail with reference to fig. 3 and 4. In the Reset and charge phase T1, the high level provided by the Reset control signal line Reset controls the first thin film transistor T1 to be turned on, and the Reset voltage on the Reset voltage signal line VDD is transmitted to the Q node through the first thin film transistor T1, so that the potential of the Q node is Reset; in the fingerprint collection stage T2, the first thin film transistor T1 is turned off, the photodiode D1 generates leakage current due to illumination, the first capacitor C1 discharges, the potential of the Q node gradually decreases, the second thin film transistor T2 operates in a linear region, and the magnitude of the leakage current is in direct proportion to the potential of the Q node; in the data reading phase T3, the first thin film transistor T1 is turned off, the third thin film transistor T3 is turned on, the reset voltage provided by the reset voltage signal line VDD flows to the fingerprint identification data reading line Vout through the second thin film transistor T2 and the third thin film transistor T3, the degree of conduction of the second thin film transistor T2 determines the potential on the fingerprint identification data reading line Vout, the degree of conduction of the second thin film transistor T2 is determined by the voltage of the Q node, that is, the potential on the Q node determines the potential on the fingerprint identification data reading line Vout, the magnitude of the leakage current of the photodiode D1 is determined by the intensity of light received by the photodiode D1, so that the potential on the fingerprint identification data reading line Vout is different under different light intensities, and during fingerprint detection, the intensity of light reflected to the photodiode D1 is different for different fingerprint areas, so that the potential information on the fingerprint identification data line Vout corresponding to each fingerprint identification cell in the fingerprint identification area is detected, fingerprint identification can be realized.
According to the above description of the fingerprint identification working process, the fingerprint identification module can be driven according to the reference integral time, so that the fingerprint identification units in different rows can be sequentially driven according to the reference integral time to sequentially execute the fingerprint identification working process.
It should be noted that, as shown in fig. 4, the fingerprint identification phase includes the reset and charge phase t1, the fingerprint collection phase t2 and the data reading phase t3, and in the actual fingerprint identification process, the reset and charge phase t1 and the data reading phase t3 of the same fingerprint identification phase correspondingly occur in adjacent fingerprint identification frames. As shown in FIG. 4, in the mth frame fingerprinting stage, corresponding to the nth row fingerprinting units, each fingerprinting unit firstly executes the data reading stage t3 corresponding to the (m-1) th frame, and then executes the reset and charging stage t1 corresponding to the mth frame, and the data reading stage t3 corresponding to the mth frame occurs in the (m +1) th frame fingerprinting frame.
And S120, updating the reference integral time according to the average voltage value of the fingerprint image, and driving the fingerprint identification module to perform fingerprint identification according to the updated reference integral time.
Illustratively, the reference integration time is updated according to the average voltage value of the fingerprint image, and it can be understood that when the average voltage value of the fingerprint image exceeds the preset average voltage range of the fingerprint image, the reference integration time is updated, that is, the reference integration time is dynamically adjusted, and the fingerprint identification module is driven by the updated reference integration time to perform fingerprint identification, so that the average voltage value of the fingerprint image is within the preset average voltage range of the fingerprint image, thereby ensuring high fingerprint image acquisition quality and good fingerprint identification effect.
It should be noted that the reference integration time in the embodiment of the present invention represents an integration time for the fingerprint identification module to collect light reflected by the touch main body, that is, the reference integration time can be understood as the fingerprint collection phase t 2; alternatively, the reference integration time may also be understood as the entire fingerprinting phase, since the time of the reset and charge phase t1 and the data read phase t3 is short.
In summary, the driving method of the display panel provided by the embodiment of the invention dynamically adjusts the reference integration time according to the average voltage value of the fingerprint image, and drives the fingerprint identification module to perform fingerprint identification by using the updated reference integration time, so that the reference integration time is matched with the ambient temperature, the fingerprint image acquisition quality is high, and the fingerprint image identification precision is high; in addition, the driving method provided by the embodiment of the invention can realize dynamic adjustment of the reference integration time without adding other electronic devices, and is simple and efficient.
As a possible implementation manner, fig. 5 is a schematic flowchart of another driving method for a display panel according to an embodiment of the present invention, and the driving method provided in fig. 5 is based on the foregoing embodiment, and how to update the reference integration time according to the average voltage value of the fingerprint image is described in detail. As shown in fig. 5, the driving method provided by the embodiment of the present invention includes:
and S210, driving the fingerprint identification module according to the reference integration time, and acquiring an average voltage value of the fingerprint image.
And S220, if the average voltage value of the fingerprint image is smaller than a first threshold value, increasing the reference integration time and using the reference integration time as the updated reference integration time.
And S230, if the average voltage value of the fingerprint image is larger than a second threshold value, reducing the reference integration time and taking the reference integration time as the updated reference integration time.
For example, a fingerprint image average voltage range may be preset in the fingerprint identification process, and the fingerprint image average voltage range may include a first threshold value and a second threshold value, where the first threshold value may be a lower limit value of the fingerprint image average voltage range, and the second threshold value may be an upper limit value of the fingerprint image average voltage range, where the first threshold value is smaller than the second threshold value. Further, the first threshold may be understood as a minimum voltage for fingerprint identification, and when the actual voltage value of the fingerprint image is smaller than the first threshold, a clear fingerprint image cannot be acquired and fingerprint identification cannot be performed; the second threshold value can be understood as the maximum voltage capable of carrying out fingerprint identification, when the actual fingerprint image voltage value is greater than the second threshold value, although clear fingerprint images can still be obtained, the fingerprint image integration time is too long at the moment, the fingerprint identification refresh frequency is too low, and the actual requirement cannot be met.
Furthermore, after the average voltage value of the fingerprint image is acquired according to the reference integral time, the average voltage value of the fingerprint image can be respectively compared with the first threshold and the second threshold, when the average voltage value of the fingerprint image is smaller than the first threshold, a clear fingerprint image cannot be acquired at the moment, the reference integral time needs to be prolonged, the extended reference integral time is used as the updated reference integral time to acquire the average voltage value of the fingerprint image again, and the steps can be repeated until the average voltage value of the fingerprint image is not smaller than the first threshold, so that the quality of the fingerprint image is guaranteed to be improved, and the fingerprint identification accuracy is improved. When the average voltage value of the fingerprint image is greater than the second threshold value, the fingerprint identification refresh frequency is too low at the moment, the reference integration time needs to be reduced, the reduced reference integration time is used as the updated reference integration time to obtain the average voltage value of the fingerprint image again, and the steps can be repeated until the average voltage value of the fingerprint image is not greater than the second threshold value, so that the refresh frequency is guaranteed to be increased, and the fingerprint identification accuracy is improved.
Fig. 6 is a schematic flow chart of another driving method for a display panel according to an embodiment of the present invention, and the driving method for a display panel according to an embodiment of the present invention is based on the foregoing embodiment, and how to determine the reference integration time is described in detail. As shown in fig. 6, a driving method provided in an embodiment of the present invention includes:
s310, setting a plurality of sequentially increased integration time to be selected, wherein the reference integration time is smaller than the maximum value of the integration time to be selected and is larger than one of the minimum values of the integration time to be selected.
Illustratively, a plurality of integration time to be selected can be preset, any two integration time to be selected are different, and the integration time to be selected is obtained by sequencing the integration time to be selected in sequence according to the integration time length, wherein the integration time to be selected is increased in sequence. When the reference integration time is selected, the to-be-selected integration time located in the middle gear can be selected as the reference integration time, namely the reference integration time is smaller than the maximum value of the to-be-selected integration times and larger than one of the minimum values of the to-be-selected integration times, so that the situation that due to the fact that the reference integration time is too large or too small, the reference integration time needs to be updated for many times to obtain a proper reference integration time can be avoided, the updating process of the reference integration time is simple, and the selection of the reference integration time is efficient.
Furthermore, the maximum value of the integration time to be selected can be the integration time Tmax corresponding to the low-temperature limit that the fingerprint identification unit can bear, and the fingerprint identification unit can realize fingerprint identification at the time of integrating the Tmax under the low-temperature limit; the minimum value of the multiple integration times to be selected can be the integration time Tmin corresponding to the high temperature limit that the fingerprint identification unit can bear, and the fingerprint identification unit can realize fingerprint identification by integrating the time Tmin under the high temperature limit.
Further, when the number of integration times to be selected is 2X + 1; the reference integration time is the (X +1) th to-be-selected integration time in the plurality of sequentially increased to-be-selected integration times; wherein X is a positive integer. Namely, the to-be-selected integration time positioned in the middle gear among the plurality of to-be-selected integration times is selected as the reference integration time, so that the updating process of the reference integration time is the simplest, and the selection of the reference integration time is the most efficient.
Further, when the number of integration times to be selected is 2X + 2; the reference integration time is the (X +1) th to-be-selected integration time in the plurality of to-be-selected integration times which are sequentially increased, or the reference integration time is the (X + 2) th to-be-selected integration time in the plurality of to-be-selected integration times which are sequentially increased; wherein X is a positive integer. And selecting the integration time to be selected positioned in the middle gear from the plurality of integration times to be selected as the reference integration time, so that the updating process of the reference integration time is simplest and the selection of the reference integration time is most efficient.
On the basis of the above embodiment, the driving period of the display panel includes the display frame and the fingerprint identification frame, and the time sequence relationship between the display frame and the fingerprint identification frame is reasonably set, so that it can be ensured that the integration time to be selected can be set in various ways, and the setting way of the integration time to be selected is described in detail below.
As a possible implementation manner, the integration time to be selected may be obtained by setting at least 2 frames of fingerprint identification frames between two adjacent frames of display frames, and adjusting a time interval between two adjacent frames of fingerprint identification frames, so that the integration time to be selected a is Tf + t; wherein, a is the integration time to be selected, Tf is the driving period of the fingerprint identification frame, and t is the time interval between two adjacent fingerprint identification frames.
Specifically, fig. 7 is a schematic diagram of a driving timing sequence of a driving method of a display panel in the prior art, and fig. 8 is a schematic diagram of a driving timing sequence of a driving method of a display panel according to an embodiment of the present invention, as shown in fig. 7 and 8, a driving period of the display panel includes a display frame and a fingerprint identification frame, a refresh period of the display frame is Td, and a refresh period of the fingerprint identification frame is Tf. With reference to fig. 4 and 7, in the prior art, only one frame of fingerprint identification frame is disposed between two adjacent frames of display frames, for the nth row of fingerprint identification units, the reset and charge phase t1 in the fingerprint identification process occurs in the mth frame of fingerprint identification frame, the fingerprint collection phase t2 partially occurs in the mth frame of fingerprint identification frame, partially occurs in the display frame between the mth frame of fingerprint identification frame and the m +1 th frame of fingerprint identification frame, the data reading phase t3 occurs in the m +1 th frame of fingerprint identification frame, and the fingerprint identification integration time is a fixed value, i.e., a is Tf + Td. When the fingerprint identification unit works in different environmental temperatures, as described above, the fingerprint identification integration time cannot be adjusted, resulting in low quality of fingerprint identification images and poor fingerprint identification accuracy.
Strictly speaking, the fingerprint identification integration time is the above fingerprint collection phase t2, and since the time of the reset and charge phase t1 and the data read phase t3 is very short, the fingerprint collection phase t2 is much longer than the reset and charge phase t1 and the data read phase t3, where the fingerprint identification integration time a is Tf + Td neglects the influence of the reset and charge phase t1 and the data read phase t3, and the fingerprint identification integration time a is Tf + Td is taken as an example for explanation. If the reset and charge phase t1 and the data read phase t3 are considered, the actual fingerprint identification integration time is slightly less than Tf + Td.
In the embodiment of the invention, because the time interval between two adjacent frames of display frames is larger, at least 2 frames of fingerprint identification frames are arranged between two adjacent frames of display frames, and the time interval between two adjacent frames of fingerprint identification frames is adjusted, so that the integration time A to be selected is Tf + t, wherein t is the time interval between two adjacent frames of fingerprint identification frames. For example, assuming that the refresh frequency of the display frame is 10HZ, and the refresh period Td of the display frame satisfies Td being 16.6ms, the time between two adjacent display frames is 100-16.6ms being 83.4 ms; assuming that the refresh period Tf of the fingerprint identification frame satisfies Tf is 16.6ms, the time interval t between two adjacent fingerprint identification frames is in the range of 0-50.2 ms (100-16.6-16.6-16.6), so the adjustable range Tf + t of the fingerprint identification integration time is 16.6 ms-66.8 ms, the fingerprint identification integration time is adjustable and the adjustment range is large, and when the fingerprint identification unit works in different environmental temperatures, the reference integration time can be updated and adjusted according to the average voltage of the fingerprint identification image, thereby ensuring high quality of the acquired fingerprint image and high fingerprint identification accuracy. For example, when the fingerprint identification unit operates in a lower temperature environment, the fingerprint identification time needs to be prolonged at this time to ensure the quality of a fingerprint image, and t can be set to be greater than 16.6ms at this time, so that the integration time a to be selected is Tf + t greater than Tf + Td in the prior art, and the fingerprint identification requirement is met; when the fingerprint identification unit works in a higher environment temperature, the fingerprint identification time needs to be reduced, the leakage current is reduced, t can be set to be less than 16.6ms, so that the integral time A to be selected is Tf + t which is less than Tf + Td in the prior art, and the fingerprint identification requirement is met.
It should be noted that, here, the integration time a to be selected is Tf + t, and also because the time of the reset and charge phase t1 and the data read phase t3 is very short, the fingerprint collection phase t2 is much longer than the reset and charge phase t1 and the data read phase t3, here, the fingerprint identification integration time a is Tf + t neglects the influence of the reset and charge phase t1 and the data read phase t3, and if the reset and charge phase t1 and the data read phase t3 are considered, the actual integration time to be selected is slightly shorter than Tf + t.
As another possible implementation, one frame of fingerprint identification frame is set every n display frames, and the driving of the fingerprint identification module is performed every m fingerprint identification frames, so that the integration time a to be selected is (nTd + Tf) × (m + 1); a is to-be-selected integration time, Tf is a driving period of a fingerprint identification frame, t is a time interval between two adjacent fingerprint identification frames, Td is a driving period of a display frame, n is a positive integer greater than or equal to 1, and m is a natural number greater than or equal to 0.
Fig. 9 is a schematic diagram of a driving timing sequence of another driving method for a display panel according to an embodiment of the present invention, and fig. 10 is a schematic diagram of a driving timing sequence of another driving method for a display panel according to an embodiment of the present invention, where fig. 9 illustrates an example in which a frame of fingerprint recognition frame is set every other display frame and a fingerprint recognition module is driven every other fingerprint recognition frame, and fig. 10 illustrates an example in which a frame of fingerprint recognition frame is set every other two display frames and each fingerprint recognition frame drives a fingerprint recognition module.
As shown in fig. 9, every other display frame is provided with a frame of fingerprint identification frame, that is, n is 1, that is, a frame of fingerprint identification frame is provided between two adjacent display frames, and the difference between the driving sequence shown in fig. 9 and the driving sequence shown in fig. 7 is that every other fingerprint identification frame in the driving sequence shown in fig. 9 drives the fingerprint identification module, that is, m is 1, that is, in two adjacent fingerprint identification frames, there is a fingerprint identification frame that does not drive the fingerprint identification module, that is, the above-mentioned reset and charging phase t1 and data reading phase t3 are not performed, and the fingerprint collection phase t2 is continuously performed in the two fingerprint identification frames, so that the fingerprint integration time, that is, the reference integration time, is dynamically adjusted to ensure that the reference integration time matches with the ambient temperature of the fingerprint identification module. Taking the driving sequence shown in fig. 9 as an example, n is 1, m is 1, and the integration time a is 2 (Td + Tf).
It should be noted that fig. 9 only illustrates that every other fingerprint identification frame is used to drive the fingerprint identification module, and the driving method provided in the embodiment of the present invention may further include other driving timings, for example, every other two fingerprint identification frames are used to drive the fingerprint identification module, and the integration time a to be selected is 3 (Td + Tf), and the embodiment of the present invention does not limit the driving of the fingerprint identification module to every several fingerprint identification frames.
It should be noted that, also because the time of the reset and charge phase t1 and the data read phase t3 is short, the fingerprint collection phase t2 is much longer than the reset and charge phase t1 and the data read phase t3, and the fingerprint identification integration time a is 2 (Td + Tf) ignores the influence of the reset and charge phase t1 and the data read phase t3, and if the reset and charge phase t1 and the data read phase t3 are considered, the actual integration time to be selected is slightly shorter than 2 (Td + Tf).
As shown in fig. 10, every two display frames are provided with one frame of fingerprint identification frame, that is, n is 2; every fingerprint identification frame all carries out the drive of fingerprint identification module, and m is 0 promptly. The difference between the driving sequence shown in fig. 10 and the driving sequence shown in fig. 7 is that in the driving sequence shown in fig. 10, one frame of fingerprint identification frame is set every two display frames, i.e. fingerprint identification frame-display frame-fingerprint identification frame, and there is no fingerprint identification frame set between two adjacent display frames, i.e. fingerprint data acquisition is continuously performed in two display frames in the fingerprint acquisition stage t2, so that the fingerprint integration time, i.e. reference integration time, is dynamically adjusted to ensure that the reference integration time matches with the ambient temperature of the fingerprint identification module. Taking the driving timing shown in fig. 10 as an example, n is 2, m is 0, and the integration time a to be selected is (2Td + Tf).
It should be noted that fig. 10 only illustrates that one frame of fingerprint identification frame is set every two display frames, and the driving method provided in the embodiment of the present invention may further include other driving timings, for example, the driving of the fingerprint identification module is performed every three display frames, and at this time, the integration time a to be selected is (3Td + Tf).
It should be noted that fig. 10 only illustrates that each fingerprint identification frame drives the fingerprint identification module, and the driving method provided in the embodiment of the present invention may further include other driving timings, for example, every other fingerprint identification frame drives the fingerprint identification module, that is, there is a fingerprint identification frame that does not drive the fingerprint identification module, and at this time, the integration time a to be selected is 2 × (2Td + Tf), and the embodiment of the present invention does not limit the driving of the fingerprint identification module to every several fingerprint identification frames.
It should be noted that, here, the integration time a to be selected is (2Td + Tf), also because the time of the reset and charge phase t1 and the data read phase t3 is very short, the fingerprint collection phase t2 is much longer than the reset and charge phase t1 and the data read phase t3, here, the fingerprint identification integration time a is (2Td + Tf) neglects the influence of the reset and charge phase t1 and the data read phase t3, and if the reset and charge phase t1 and the data read phase t3 are considered, the actual integration time a to be selected is slightly shorter than a (2Td + Tf).
In summary, the above embodiment describes in detail how to reasonably set the time sequence relationship between the display frame and the fingerprint identification frame, so as to ensure that the integration time to be selected is dynamically adjustable, and according to the integration time to be selected, it is ensured that the reference integration time is matched with the ambient temperature line, so as to ensure that the quality of the acquired fingerprint image is high and the fingerprint identification accuracy is high.
On the basis of the above embodiment, it can be known that the to-be-selected integration time corresponding to the driving timing sequence shown in fig. 8 may be less than, equal to, or greater than the to-be-selected integration time corresponding to the driving timing sequence shown in fig. 7, the to-be-selected integration time corresponding to the driving timing sequence shown in fig. 9 may be equal to or greater than the to-be-selected integration time corresponding to the driving timing sequence shown in fig. 7, and the to-be-selected integration time corresponding to the driving timing sequence shown in fig. 10 may be equal to or greater than the to-be-selected integration time corresponding to the driving timing sequence shown in fig. 7. Taking the fingerprint identification integration time in the prior art as a reference, when the fingerprint identification integration time needs to be reduced, setting can be performed by referring to the driving time sequence shown in fig. 8; when it is necessary to increase the fingerprint identification integration time, it may be set with reference to the driving timings shown in fig. 8, 9, and/or 10. The embodiment of the invention does not limit the method, the setting mode of the integration time to be selected can be flexibly set according to specific conditions, and only a plurality of sequentially increased integration time to be selected can be set.
Further, the selection of the integration time to be selected determines how to select the integration time to be selected from the viewpoint of the environment temperature, and it can be understood that the selection may also be performed from the viewpoint of the sensitivity of the fingerprint unit, and if the sensitivity of the fingerprint identification unit is low, the setting may be performed by referring to the driving timing shown in fig. 8, 9, and/or 10, so as to reasonably prolong the fingerprint identification integration time and ensure the fingerprint identification effect.
And S320, driving the fingerprint identification module according to the reference integration time, and acquiring an average voltage value of the fingerprint image.
S330, if the average voltage value of the fingerprint image is smaller than a first threshold value, the integration time to be selected which is larger than the reference integration time and has the smallest difference with the reference integration time is used as the updated reference integration time.
And S340, if the average voltage value of the fingerprint image is greater than a second threshold value, taking the integration time to be selected, which is less than the reference integration time and has the smallest difference with the reference integration time, as the updated reference integration time.
For example, the average voltage range of the fingerprint image may be preset in the fingerprint identification process, and the average voltage range of the fingerprint image may include a first threshold value and a second threshold value, where the first threshold value may be a lower limit value of the average voltage range of the fingerprint image, and the second threshold value may be an upper limit value of the average voltage range of the fingerprint image. Further, the first threshold may be understood as a minimum voltage for fingerprint identification, and when the actual voltage value of the fingerprint image is smaller than the first threshold, a clear fingerprint image cannot be obtained, and fingerprint identification cannot be performed; the second threshold value can be understood as the maximum voltage capable of fingerprint identification, when the actual fingerprint image voltage value is greater than the second threshold value, although a clear fingerprint image can still be acquired, the fingerprint image integration time is too long, the fingerprint identification refresh frequency is too low, and the actual requirement cannot be met, wherein the first threshold value is less than the second threshold value.
Further, after the average voltage value of the fingerprint image is obtained according to the reference integration time, the average voltage value of the fingerprint image can be respectively compared with the first threshold and the second threshold, when the average voltage value of the fingerprint image is smaller than the first threshold, a clear fingerprint image cannot be obtained at the moment, the reference integration time needs to be prolonged, the integration time to be selected, which is larger than the reference integration time and has the smallest difference value with the reference integration time, can be used as the updated reference integration time to obtain the average voltage value of the fingerprint image again, and the steps can be repeated until the average voltage value of the fingerprint image is not smaller than the first threshold, so that the quality of the fingerprint image is guaranteed to be improved, and the fingerprint identification accuracy is improved. When the average voltage value of the fingerprint image is greater than the second threshold value, the fingerprint identification refresh frequency is too low, the reference integration time needs to be reduced, the integration time to be selected, which is less than the reference integration time and has the smallest difference with the reference integration time, can be used as the updated reference integration time to obtain the average voltage value of the fingerprint image again, and the steps can be repeated until the average voltage value of the fingerprint image is not greater than the second threshold value, so that the refresh frequency is guaranteed to be increased, and the fingerprint identification accuracy is improved.
On the basis of the above embodiment, with continued reference to fig. 10, n is an even number; the display data signals of two adjacent display frames of the display panel have opposite polarities.
For example, fig. 10 illustrates that n is 2, as shown in fig. 10, the fingerprint capturing phase t2 includes a display phase, that is, the fingerprint capturing phase and the display phase coincide in time sequence, so as to avoid that the display data signals with different polarities have different influences on the subsequent data reading signal Vout and influence the fingerprint identification accuracy, the polarities of the display data signals in the display frame before the fingerprint identification frame may be set to be the same, for example, both positive polarities or both negative polarities. Further, in order to avoid damage to the display panel due to long-term display of the display panel under the same polarity, for example, liquid crystal in the liquid crystal display panel may be damaged due to long-term deflection under the same polarity, polarity deflection may be set in the display process of the display panel, for example, the polarities of the data signals set in adjacent display frames are opposite. Therefore, in the embodiment of the present invention, in order to simultaneously avoid the technical problem that the display data signals with different polarities have different influences on the subsequent data read signal Vout and the technical problem that the display panel displays the display panel with the same polarity for a long time, n is set to be an even number, that is, an even number of display frames are set between two adjacent fingerprint identification frames, and the polarities of the display data signals of the two adjacent display frames are opposite, in order that n is 2 in fig. 10, the polarities of the display data signals before the fingerprint identification frames are always the same, so that the display effect is ensured to be good without causing damage to the display panel under the condition of ensuring good fingerprint identification accuracy.
On the basis of the foregoing embodiment, fig. 11 is a schematic flowchart of another driving method for a display panel according to an embodiment of the present invention, and the driving method provided in fig. 11 describes in detail how to update the reference integration time according to the average voltage value of the fingerprint image on the basis of the foregoing embodiment. As shown in fig. 11, the driving method provided in the embodiment of the present invention includes:
and S410, driving the fingerprint identification module according to the reference integration time, and acquiring an average voltage value of the fingerprint image.
And S420, determining the integration time to be selected corresponding to the average voltage value of the fingerprint image according to the mapping relation between the average voltage value of the fingerprint image and the integration time to be selected, and taking the integration time to be selected as the updated reference integration time to drive the fingerprint identification module to carry out fingerprint identification according to the updated reference integration time.
For example, a mapping relationship between the average voltage value of the fingerprint image and the integration time to be selected may be preset, for example, a mapping table between the average voltage value of the fingerprint image and the integration time to be selected is established, so that the integration time to be selected may be directly determined according to the average voltage value of the fingerprint image determined in S410, that is, the updated reference integration time is determined, so that more refined control and management may be performed on the reference integration time, it is ensured that the updated reference integration time is well matched with the current ambient temperature, it is ensured that the fingerprint signal acquisition time is neither too long nor too short, the fingerprint image acquisition quality and the fingerprint signal acquisition frequency are both considered, and it is ensured that the fingerprint identification effect is good.
On the basis of the foregoing embodiment, fig. 12 is a schematic flowchart of another driving method for a display panel according to an embodiment of the present invention, and the driving method provided in fig. 12 details how to obtain an average voltage value of a fingerprint image on the basis of the foregoing embodiment. As shown in fig. 12, the driving method according to the embodiment of the present invention includes:
and S510, driving the fingerprint identification module to execute a plurality of fingerprint identification frames according to the reference integration time.
S520, determining the average voltage value of the fingerprint image according to the fingerprint images acquired by the plurality of fingerprint identification frames.
And S530, updating the reference integration time according to the average voltage value of the fingerprint image, and driving the fingerprint identification module to perform fingerprint identification according to the updated reference integration time.
As can be seen from the above description, the acquiring of the average voltage value of the fingerprint image may be determining the average voltage value of the fingerprint image according to the partial fingerprint images acquired by the plurality of fingerprint identification units. Furthermore, in the reference integral time, the fingerprint identification module can be driven to execute a plurality of fingerprint identification frames, and in each fingerprint identification frame, the fingerprint identification unit can acquire the voltage value of a part of fingerprint images. In the embodiment of the invention, the average voltage value of the fingerprint image is determined according to the fingerprint images acquired by a plurality of fingerprint identification frames, wherein in one fingerprint identification frame, a plurality of fingerprint identification units respectively acquire the voltage values of partial fingerprint images, then the average voltage value of a single-frame fingerprint image corresponding to the current fingerprint identification frame is determined according to the voltage values of the partial fingerprint images, and then the average voltage value of the fingerprint image is determined according to a plurality of fingerprint identification frames in reference integration time, and the average voltage value of the fingerprint image can be, for example, a weighted average of the average voltage values of the single-frame fingerprint images. Or, in the embodiment of the present invention, the average voltage value of the fingerprint image is determined according to the fingerprint images acquired by the multiple fingerprint identification frames, or in multiple fingerprint identification frames corresponding to the reference integration time, each fingerprint identification unit obtains the voltage values of the partial fingerprint images multiple times, obtains the average voltage values of the multiple partial fingerprint images based on each fingerprint identification unit, and determines the average voltage value of the fingerprint image based on the average voltage values of the multiple partial fingerprint images. The average voltage value of the fingerprint image is determined according to the fingerprint images acquired by the plurality of fingerprint identification frames, so that the average voltage value of the fingerprint image can be ensured to be more accurate, the matching degree of the reference integral time updated according to the average voltage value of the fingerprint image and the ambient temperature is ensured to be higher, the fingerprint image acquisition quality is ensured, and the fingerprint identification precision is high.
On the basis of the foregoing embodiment, as shown in fig. 1, the display panel provided in the embodiment of the present invention may further include a touch electrode 13, that is, the display panel that realizes display, touch, and fingerprint recognition integration. Correspondingly, fig. 13 is a schematic diagram of a driving timing sequence of another driving method of a display panel according to an embodiment of the present invention, and as shown in fig. 13, a driving period of the display panel includes a display frame and a fingerprint identification frame; the display frame comprises a display stage and a touch position identification stage; the display stage and the touch position identification stage are not overlapped in time sequence; the display frame and the fingerprint identification frame are not overlapped in time sequence. The display stage and the touch position identification stage are set to be not overlapped in time sequence, namely the display stage and the touch position identification stage are carried out in a time-sharing mode, so that the display stage and the touch position identification stage are guaranteed to be driven independently and not to interfere with each other, the display effect is good, and the touch position identification accuracy is high; meanwhile, the display frame and the fingerprint identification frame are not overlapped in time sequence, the reset and charging stage t1 in the fingerprint identification frame and the data reading stage t3 in the fingerprint identification frame are ensured not to interfere with the display signals in the display frame, the display effect is ensured to be good, and the fingerprint identification accuracy is high.
On the basis of the above embodiment, the driving period of the display frame is equal to the driving period of the fingerprint identification frame, so that the same clock signal can be shared in the display frame stage and the fingerprint identification frame stage, thereby ensuring that the driving method of the driving circuit is simple and the setting mode of the clock signal line is simple.
Based on the same inventive concept, the embodiment of the present invention further provides a display apparatus, where the display apparatus 100 includes an upper display panel 10 and a driving apparatus 20, the driving apparatus 20 drives the display panel 10 by using the driving method described in the above embodiment, and the display apparatus also has the beneficial effects of the driving method in the above embodiment, and the same points can be understood by referring to the above explanation of the driving method, and will not be described again below.
The display device 100 provided in the embodiment of the present invention may be a mobile phone as shown in fig. 14, and may also be any electronic product having a display function and a fingerprint identification function, including but not limited to the following categories: the touch screen display system comprises a television, a notebook computer, a desktop display, a tablet computer, a digital camera, an intelligent bracelet, intelligent glasses, a vehicle-mounted display, industrial control equipment, a medical display screen, a touch interaction terminal and the like, and the embodiment of the invention is not particularly limited in this respect.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. 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, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (11)
1. A method of driving a display panel, comprising:
driving a fingerprint identification module according to the reference integral time, and acquiring an average voltage value of a fingerprint image;
updating the reference integral time according to the average voltage value of the fingerprint image, and driving the fingerprint identification module to perform fingerprint identification according to the updated reference integral time;
the reference integration time represents the collection integration time of the reflected light of the touch main body by the fingerprint identification module;
drive fingerprint identification module according to reference integral time to acquire fingerprint image average voltage value, include:
driving a fingerprint identification module to execute a plurality of fingerprint identification frames according to the reference integral time;
and determining the average voltage value of the fingerprint image according to the fingerprint images acquired by the plurality of fingerprint identification frames.
2. The driving method according to claim 1, wherein the updating the reference integration time according to the average voltage value of the fingerprint image comprises:
if the average voltage value of the fingerprint image is smaller than a first threshold value, increasing the reference integration time, and taking the reference integration time as the updated reference integration time;
if the average voltage value of the fingerprint image is larger than a second threshold value, reducing the reference integration time, and taking the reference integration time as the updated reference integration time;
wherein the first threshold is less than or equal to the second threshold.
3. The driving method according to claim 1, further comprising, before the driving the fingerprint recognition module according to the reference integration time and obtaining the average voltage value of the fingerprint image:
setting a plurality of sequentially increased integration time to be selected, wherein the reference integration time is smaller than the maximum value of the integration time to be selected and is larger than one of the minimum values of the integration time to be selected;
the updating of the reference integration time according to the average voltage value of the fingerprint image comprises:
if the average voltage value of the fingerprint image is smaller than a first threshold value, taking the integration time to be selected which is larger than the reference integration time and has the smallest difference with the reference integration time as the updated reference integration time;
and if the average voltage value of the fingerprint image is larger than a second threshold value, taking the integration time to be selected which is smaller than the reference integration time and has the minimum difference with the reference integration time as the updated reference integration time.
4. The driving method according to claim 3, wherein the number of the integration times to be selected is 2X + 1; the reference integration time is the integration time to be selected of the X +1 th integration time to be selected in the plurality of sequentially increased integration times to be selected;
wherein X is a positive integer.
5. The driving method according to claim 3, wherein the integration time to be selected is set in any one of the following manners:
setting at least 2 fingerprint identification frames between two adjacent display frames, and adjusting the time interval between two adjacent fingerprint identification frames to enable the integration time A = Tf + t to be selected;
every n display frames are provided with one frame of fingerprint identification frame, and every m fingerprint identification frames are used for driving a fingerprint identification module so as to enable the integration time A = (nTd + Tf) × (m +1) to be selected;
a is integration time to be selected, Tf is a driving period of a fingerprint identification frame, t is a time interval between two adjacent fingerprint identification frames, Td is a driving period of a display frame, n is a positive integer greater than or equal to 1, and m is a natural number greater than or equal to 0; and n = 1.
6. The driving method according to claim 5, wherein different ones of the integration times to be selected are set in the same or different manners.
7. The driving method according to claim 5, wherein n is an even number; the display data signals of two adjacent display frames of the display panel have opposite polarities.
8. The driving method according to claim 1, wherein the updating the reference integration time according to the average voltage value of the fingerprint image comprises:
and determining the integration time to be selected corresponding to the average voltage value of the fingerprint image according to the mapping relation between the average voltage value of the fingerprint image and the integration time to be selected, and taking the integration time to be selected as the updated reference integration time.
9. The driving method according to claim 1, wherein the driving period of the display panel includes a display frame and a fingerprint recognition frame; the display frame comprises a display stage and a touch position identification stage;
the display stage and the touch position identification stage are not overlapped in time sequence; the display frame and the fingerprint identification frame are not overlapped in time sequence.
10. The driving method according to claim 9, wherein a driving period of the display frame is equal to a driving period of the fingerprint recognition frame.
11. A display device comprising a display panel and a driving device which drives the display panel by the driving method according to any one of claims 1 to 10.
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