CN115328328A - Display module, display equipment, fingerprint detection method, fingerprint detection device and storage medium - Google Patents

Display module, display equipment, fingerprint detection method, fingerprint detection device and storage medium Download PDF

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Publication number
CN115328328A
CN115328328A CN202110454306.4A CN202110454306A CN115328328A CN 115328328 A CN115328328 A CN 115328328A CN 202110454306 A CN202110454306 A CN 202110454306A CN 115328328 A CN115328328 A CN 115328328A
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Prior art keywords
charging
photosensitive
photosensitive pixel
circuit
line
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Chinese (zh)
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王月
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Beijing Xiaomi Mobile Software Co Ltd
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Beijing Xiaomi Mobile Software Co Ltd
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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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]

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  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Computer Hardware Design (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

The disclosure relates to a display module with a fingerprint detection function, a device, a fingerprint detection method, a device and a storage medium. The display module assembly includes: a pixel array, wherein the pixel array comprises: a plurality of photosensitive pixel units distributed in an array; each photosensitive pixel cell includes: a photodiode and a switching circuit; the charging circuit is connected with the input end of the switch circuit and is used for charging the corresponding photosensitive pixel unit through the charging circuit; the pre-charging circuit is connected with the output end of the switch circuit and used for charging the photosensitive diode of the corresponding photosensitive pixel unit in advance through the pre-charging circuit before the charging circuit charges the photosensitive diode of the corresponding photosensitive pixel unit when the pixel array carries out fingerprint scanning.

Description

Display module, display equipment, fingerprint detection method and device, and storage medium
Technical Field
The present disclosure relates to the field of electronic technologies, and in particular, to a display module, a device, a fingerprint detection method, a fingerprint detection apparatus, and a storage medium.
Background
In the related art, the optical fingerprint scheme under the organic light-Emitting Diode (OLED) screen can effectively improve the screen occupation ratio of the mobile phone due to the more invisible design, and becomes the mainstream fingerprint scheme of the flagship machine of the current mainstream mobile phone manufacturer.
A photosensitive circuit board based on a Thin Film Transistor (TFT) is an essential element in an OLED underscreen fingerprint detection device; the photosensitive circuit board can be divided into: an active photosensitive circuit board and a passive photosensitive circuit board; because the signal-to-noise ratio of the signals collected by the active photosensitive circuit board is superior to that of the signals collected by the passive photosensitive circuit board, the OLED under-screen fingerprint detection device usually adopts the active photosensitive circuit board.
However, in the OLED under-screen fingerprint detection device based on the active photosensitive circuit board, because the signal-to-noise ratio of the signals collected by the far-end photosensitive pixel unit is inconsistent with the signal-to-noise ratio of the signals collected by the near-end photosensitive pixel unit, the scanned fingerprint image is easily identified incorrectly, and the detection efficiency is low.
Disclosure of Invention
The disclosure provides a display module with a fingerprint detection function, equipment, a fingerprint detection method, a fingerprint detection device and a storage medium.
According to a first aspect of the embodiments of the present disclosure, a display module with a fingerprint detection function is provided, including:
a pixel array, wherein the pixel array comprises: a plurality of photosensitive pixel units distributed in an array; each photosensitive pixel unit comprises: a photodiode and a switching circuit; the input end of the switch circuit is connected with the photosensitive diode;
the charging circuit is connected with the output end of the switch circuit and is used for charging the corresponding photosensitive pixel unit through the charging circuit;
the pre-charging circuit is connected with the output end of the switch circuit and used for charging the photosensitive diode of the corresponding photosensitive pixel unit in advance through the pre-charging circuit before the charging circuit charges the photosensitive diode of the corresponding photosensitive pixel unit when the pixel array carries out fingerprint scanning.
Optionally, the pre-charge circuit comprises:
a precharge line connected to an output terminal of each of the switching circuits;
the switch assembly is positioned on the pre-charging line and used for switching on or off the pre-charging line;
and the pre-charging source is connected with the pre-charging line and is used for charging the photosensitive diode of the corresponding photosensitive pixel unit in advance through the conducted pre-charging line.
Optionally, the pre-charge line includes:
the first pre-charging line is connected with the output ends of the switch circuits of the photosensitive pixel units in the odd rows in the pixel array;
the second pre-charging line is connected with the output ends of the switch circuits of the photosensitive pixel units in the even rows in the pixel array;
the switch assembly comprises a plurality of switch elements which are respectively positioned on the first pre-charging line and the second pre-charging line; the switch component is used for controlling the first pre-charging line to be conducted and the second pre-charging line to be disconnected, or controlling the first pre-charging line to be disconnected and the second pre-charging line to be conducted.
Optionally, the switch assembly at least includes:
the first switch element is positioned on the first pre-charging line and used for switching on or off the first pre-charging line;
the second switch element is positioned on the second pre-charging line and used for switching on or off the second pre-charging line;
wherein the first switching element and the second switching element are in opposite switching states.
Optionally, the switch assembly further includes:
a switch state control circuit connected to the first switch element and the second switch element, respectively, for outputting a first control signal to the first switch element, respectively; and inputting a second control signal to the second switching element; the second control signal is an inverted signal formed by inverting the first control signal.
Optionally, the switch state control circuit includes: a clock signal generating circuit;
the clock signal generating circuit is configured to generate the first control signal that varies in a time domain and form the second control signal by inverting the first control signal.
Optionally, the first switching element is a first transistor; the second switching element is a second transistor;
the switch state control circuit is respectively connected with the grids of the first transistor and the second transistor; the source electrode and the drain electrode of the first transistor are connected to the first pre-charging line; the source and the drain of the second transistor are connected to the second precharge line.
Optionally, the pixel array is divided into: n areas; wherein N is a positive integer equal to or greater than 2;
the pre-charge sources of the photosensitive pixel cells of different regions are different.
Optionally, the display module further includes:
the touch panel is stacked with the pixel array;
the control module is connected with the touch panel and used for controlling the pre-charging power supply of at least one area of the N areas acted by the touch operation to pre-charge the corresponding photosensitive pixel unit according to the position of the touch operation detected by the touch panel.
According to a second aspect of the embodiments of the present disclosure, there is provided a display apparatus including:
the display module according to the first aspect of the embodiments of the present disclosure;
the fingerprint identification module, with the display module assembly is connected, is used for acquireing the fingerprint detected signal of display module assembly scanning, according to fingerprint detected signal carries out fingerprint identification.
According to a third aspect of the embodiments of the present disclosure, a fingerprint detection method is provided, which is applied to the display module of the first aspect of the embodiments of the present disclosure, and the method includes:
when a pixel array scans fingerprints, through a pre-charging line, before a charging circuit charges a photosensitive diode of a photosensitive pixel unit contained in the pixel array, the photosensitive diode of the photosensitive pixel unit is charged in advance;
charging, by the charging circuit, a photodiode of the photosensitive pixel unit;
and detecting an electric signal of the charged photodiode of the photosensitive pixel unit.
Optionally, when scanning a fingerprint by a pixel array, charging, by a pre-charge line, a photodiode of a photosensitive pixel unit included in the pixel array in advance before a charging circuit charges the photodiode of the photosensitive pixel unit, including:
the first pre-charging line of the display module is controlled to be connected and the second pre-charging line is controlled to be disconnected through the switch state control circuit, and the photosensitive diodes of the photosensitive pixel units in the odd-numbered rows are charged in advance by the connected first pre-charging line before the charging circuit charges the photosensitive diodes of the photosensitive pixel units in the odd-numbered rows corresponding to the pixel array;
or the second pre-charging line of the display module is controlled to be connected and the first pre-charging line is controlled to be disconnected through the switch state control circuit, and the photodiodes of the photosensitive pixel units in the even-numbered rows are charged in advance by the connected second pre-charging line before the charging circuit charges the photodiodes of the photosensitive pixel units in the even-numbered rows corresponding to the pixel array.
Optionally, when scanning a fingerprint through a pixel array, charging a photodiode of a photosensitive pixel unit in advance through a pre-charge line before a charging circuit charges the photodiode of the photosensitive pixel unit included in the pixel array, including:
controlling the conducting of a pre-charging line of at least one area in N areas of the pixel array acted by the touch operation according to the position of the touch operation detected by the touch panel; wherein N is a positive integer equal to or greater than 2;
before the charging circuit charges the photosensitive diode of the photosensitive pixel unit contained in the at least one area corresponding pixel array, the photosensitive diode of the photosensitive pixel unit is charged in advance through the conducting pre-charging line by the at least one area corresponding pre-charging source.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a fingerprint detection device including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to: the executable instructions, when executed, implement the steps in the method according to the third aspect of the embodiments of the present disclosure.
According to a fifth aspect of the embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium, wherein instructions, when executed by a processor of a mobile terminal, enable the mobile terminal to perform the steps of the method according to the third aspect of the embodiments of the present disclosure.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
in the embodiment of the disclosure, a pre-charging circuit is arranged in the display module, the pre-charging circuit is connected with each photosensitive pixel unit in the pixel array, and before the charging circuit charges the corresponding photosensitive pixel unit in the pixel array, the corresponding photosensitive pixel unit is charged in advance through the pre-charging circuit. Therefore, the charging time of each photosensitive pixel unit in the pixel array is prolonged, the signal to noise ratio of signals collected by each photosensitive pixel unit in the pixel array is consistent, the variation of electric signals collected by each photosensitive pixel unit can accurately reflect the light intensity variation of return light signals received by the photosensitive diode, and the fingerprint detection efficiency is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram illustrating an OLED under-screen fingerprint detection apparatus according to an exemplary embodiment.
Fig. 2 is a schematic diagram of an architecture of an active photosensitive circuit board based fingerprint detection device according to an exemplary embodiment.
Fig. 3 is a schematic structural diagram of a display module according to an embodiment of the disclosure.
Fig. 4 is a schematic structural diagram of a display module according to an embodiment of the disclosure.
Fig. 5 is a schematic structural diagram of a display module according to an embodiment of the disclosure
Fig. 6 is a flowchart illustrating a fingerprint detection method according to an embodiment of the disclosure.
Fig. 7 is a schematic diagram illustrating a structure of a light-sensitive pixel cell according to an exemplary embodiment.
Fig. 8 is a timing diagram illustrating control signals for a light sensitive pixel cell according to an exemplary embodiment.
Fig. 9 is a schematic diagram illustrating potential changes of the first node P, the second node Q and the start signal of the photosensitive pixel unit according to an exemplary embodiment.
Fig. 10 is a schematic diagram illustrating potential changes of the first node P, the second node Q and the enable signal of a remote photosensitive pixel unit according to an exemplary embodiment.
Fig. 11 is a schematic structural diagram of a display module according to an exemplary embodiment.
FIG. 12 is a timing diagram illustrating control signals of a display module according to an exemplary embodiment.
Fig. 13 is a first schematic diagram illustrating a structure of a pixel array according to an exemplary embodiment.
Fig. 14 is a schematic structural diagram of a pixel array shown in accordance with an exemplary embodiment.
FIG. 15 is a diagram illustrating a fingerprint sensing device according to an exemplary embodiment.
Fig. 16 is a block diagram illustrating an electronic device apparatus 800 in accordance with an example embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Fig. 1 is a schematic diagram illustrating an OLED under-screen fingerprint detection apparatus according to an exemplary embodiment. When a finger touches the OLED display panel, the light emitting unit sends detection optical signals to the finger, and the light detection unit converts the returned detection optical signals into fingerprint detection signals in the form of electric signals and transmits the fingerprint detection signals to the photosensitive circuit board; the photosensitive circuit board determines a fingerprint image based on the fingerprint detection signal.
It can be understood that since a finger fingerprint includes a fingerprint ridge (ridge) and a fingerprint valley (valley); when a finger touches the OLED display panel, the fingerprint ridges are in contact with the transparent substrate, and the fingerprint valleys are not in contact with the transparent substrate; the light detection unit corresponding to the fingerprint ridge detects the intensity of reflected light of a composite interface formed by the fingerprint ridge and the transparent substrate; the light detection unit corresponding to the fingerprint valley detects only the intensity of the light reflected by the transparent substrate; the intensity of the reflected light corresponding to the fingerprint ridges and fingerprint valleys is different; the corresponding fingerprint detection signals are different; the photosensitive circuit board identifies fingerprint ridges or fingerprint valleys according to the received fingerprint detection signals, and draws fingerprint images.
The photosensitive circuit board can be divided into: an active photosensitive circuit board and a passive photosensitive circuit board; because the signal-to-noise ratio of the fingerprint detection signal acquired by the active photosensitive circuit board is superior to that of the fingerprint detection signal acquired by the passive photosensitive circuit board, more and more OLED (organic light emitting diode) under-screen fingerprint detection devices adopt the active photosensitive circuit board.
Fig. 2 is a schematic diagram of an architecture of an active photosensitive circuit board based fingerprint detection device according to an exemplary embodiment. The device comprises: the device comprises a pixel array, an array control module, a charging current source and a collecting chip; wherein the pixel array is composed of W × H photosensitive pixel units; the photosensitive pixel units in the same row receive the same reset signal and the same starting signal; and the same power supply and the reset power supply are connected; the input ends of the photosensitive pixel units in the same column are connected together, and the charging current source and the acquisition chip are connected with the output end of the pixel array and used for acquiring fingerprint detection signals output by the photosensitive pixel units.
The pixel reading mode of the device is that all photosensitive pixel units in a first row of the pixel array are sequentially collected downwards, and fingerprint detection signals output by all photosensitive pixel units in the pixel array are collected at one time; the photosensitive pixel units acquired by the acquisition chip are controlled by the array control module, so that the number of control lines required by the acquisition chip to control the pixel array can be reduced.
Based on this, an embodiment of the present disclosure provides a display module having a fingerprint detection function, fig. 3 is a schematic structural diagram of a display module shown in an embodiment of the present disclosure, as shown in fig. 3, the display module 100 includes:
a pixel array 101, wherein the pixel array 101 comprises: a plurality of light-sensitive pixel units 1011 arranged in an array; each of the photosensitive pixel cells 1011 includes: a photodiode 1011a and a switching circuit 1011b; the input end of the switch circuit 1011b is connected to the photodiode 1101 a;
the charging circuit 102 is connected to the output end of the switch circuit 1011b, and is used for charging the corresponding photosensitive pixel unit through the charging circuit 102;
the pre-charging circuit 103 is connected to the output terminal of the switch circuit 1011b, and is configured to, when the pixel array performs a fingerprint scan, charge the photodiode 1011a of the corresponding photosensitive pixel unit 1011 in advance through the pre-charging circuit 103 before the charging circuit 102 charges the photodiode 1011a of the corresponding photosensitive pixel unit 1011.
It should be noted that the display module can be applied to any electronic product with a display device, and is a module for scanning fingerprint information on the display device. The electronic product with the display device may be: a smart phone, a tablet computer, or a wearable electronic device, etc.
The display module comprises a pixel array, and the pixel array can be used for displaying pictures; the optical fingerprint sensor can also be used as an excitation light source for optical fingerprint detection, and is used for transmitting a detection light signal to a finger and receiving a reflected light signal formed by reflecting the detection light signal on the surface of the finger or a scattered light signal formed by scattering the detection light signal through the inside of the finger.
For convenience of description, the reflected light signal and the scattered light signal are collectively referred to as a return light signal. Since the ridges and valleys of the fingerprint of a finger have different reflection capabilities for light, the return light signal from the ridges of the fingerprint and the return light signal from the valleys of the fingerprint have different light intensities. The return light signal is received by the pixel array and converted into a corresponding electrical signal, namely a fingerprint detection signal; thereby obtaining fingerprint image data based on the fingerprint detection signal and further performing fingerprint matching verification.
The pixel array includes: a plurality of photosensitive pixel units distributed in an array;
the photosensitive pixel cell includes: a photodiode and a switching circuit;
the photodiode is used for sensing the return light signal and converting the return light signal into a fingerprint detection signal in the form of an electrical signal.
It should be noted that the photodiode has unidirectional conductivity, and a reverse voltage is required to be applied to the photodiode during operation. When no light is irradiated, the photosensitive diode has very small saturated reverse leakage current, namely dark current, and the photosensitive diode is cut off at the moment; if light is detected, the saturated reverse leakage current on the photosensitive diode is greatly increased to form photocurrent. The photocurrent of the photodiode varies with the intensity of the optical signal sensed by the photodiode.
The input end of the switch circuit is connected with the photosensitive diode and is used for receiving the electric signal generated by the photosensitive diode; the change quantity of the electric signal received by the input end of the switch circuit can reflect the change of the light intensity of the return light signal received by the photosensitive diode.
The charging circuit is connected with the output end of the switch circuit and can be used for charging the corresponding photosensitive pixel unit so as to detect the electric signal variation output by the photosensitive diode in the photosensitive pixel unit.
It should be noted that, in the embodiment of the present disclosure, the charging circuit charges the photosensitive pixel unit, so that the variation of the electrical signal at the output end of the switching circuit is consistent with the variation of the electrical signal output by the photodiode, and the variation of the light intensity of the return light signal received by the photodiode can be reflected according to the variation of the electrical signal at the output end of the switching circuit.
In some embodiments, the charging circuit comprises: a controlled switch assembly;
the controlled switch assembly is connected between the charging circuit and the output end of the switch circuit, when the controlled switch assembly is in a conducting state, the charging circuit is conducted, and the charging circuit charges the corresponding photosensitive pixel unit; when the controlled switch component is in an off state, the charging circuit is switched off, and the charging circuit stops charging the corresponding photosensitive pixel unit.
Therefore, when a fingerprint detection signal detected by a certain photosensitive pixel unit in the pixel array needs to be acquired, the controlled switch component is controlled to be switched on, so that the charging circuit charges the photosensitive pixel unit, and the photosensitive pixel unit converts the received return light signal into an electric signal (namely, a fingerprint detection signal) under the action of reverse voltage.
The pre-charging circuit is a circuit for pre-charging the photosensitive pixel unit;
when the pixel array performs fingerprint scanning, the charging circuit is sequentially connected to each photosensitive pixel unit in the pixel array to charge the photosensitive diode of each photosensitive pixel unit; if the photosensitive pixel unit is a far-end pixel unit, the photosensitive pixel unit is communicated with the charging circuit later than a near-end pixel unit; therefore, compared with a near-end pixel unit, the charging time of the photosensitive pixel unit is shorter, so that the variation of the electric signal of the output end of the switching circuit in the photosensitive pixel unit is smaller than that of the electric signal output by the photodiode, and the light intensity variation of the return light signal received by the photodiode cannot be accurately reflected.
Here, the length of the charging circuit corresponding to the far-end pixel unit is greater than that of the charging circuit corresponding to the near-end pixel unit; for example, if a row of photosensitive pixel units includes W photosensitive pixel units, and the length of the charging circuit of the last W/2 photosensitive pixel units in the row of photosensitive pixel units is greater than the length of the charging circuit of the last W/2 photosensitive pixel units in the row of photosensitive pixel units, then, in the row of photosensitive pixel units, the first W/2 photosensitive pixel units are proximal photosensitive pixel units, and the last W/2 photosensitive pixel units are distal photosensitive pixel units.
It can be understood that, the charging circuit charges the photosensitive pixel units in the pixel array line by line, and since the length of the charging circuit of the far-end photosensitive pixel unit is greater than that of the charging circuit of the near-end photosensitive pixel unit, the far-end photosensitive pixel unit has a certain charging delay relative to the near-end photosensitive pixel unit, resulting in insufficient charging time of the far-end photosensitive pixel unit.
According to the embodiment of the disclosure, the charging circuit charges the corresponding photosensitive diode of the photosensitive pixel unit in advance before the charging circuit charges the corresponding photosensitive diode of the photosensitive pixel unit, so that each photosensitive pixel unit in the pixel array has enough charging time, and the change of the light intensity of the return light signal received by the photosensitive diode can be accurately reflected through the voltage change of the output end of the switching circuit in the photosensitive pixel unit.
In some embodiments, fig. 4 is a schematic structural diagram of a display module according to an embodiment of the disclosure, and as shown in fig. 4, the pre-charge circuit 103 includes:
a precharge line 1031 connected to the output terminal of each of the switch circuits 1011b;
a switch component 1032 located on the pre-charge line 1031 for turning on or off the pre-charge line 1031;
and a precharge power supply 1033 connected to the precharge line 1031, for charging the photodiode 1011a of the corresponding photosensitive pixel unit 1011 in advance through the turned-on precharge line 1031.
In the embodiment of the invention, the pre-charge line is connected between the pre-charge power supply and the output end of the switch circuit in each photosensitive pixel unit; before the charging circuit to photosensitive pixel unit that corresponds charges in the pixel array, through the switch module, control with the pre-charge line that photosensitive pixel unit connects switches on, by the pre-charge line that the pre-charge source passes through to switch on, charges to corresponding photosensitive pixel unit in advance to the charge time of each photosensitive pixel unit in the extension pixel array, make the SNR of each photosensitive pixel unit acquisition signal unanimous in the pixel array, can accurately reflect through the signal to noise variation volume that each photosensitive pixel unit gathered photodiode receives the light intensity change of return light signal, improve fingerprint detection efficiency.
In some embodiments, fig. 5 is a schematic structural diagram three of a display module according to an embodiment of the disclosure, and as shown in fig. 5, the precharge line 1031 includes:
a first precharge line 1031a connected to output terminals of the switching circuits of the light-sensitive pixel cells of the odd-numbered rows in the pixel array;
a second precharge line 1031b connected to output terminals of the switching circuits of the light-sensitive pixel cells of the even-numbered rows in the pixel array;
the switch assembly 1032 comprises a plurality of switch elements respectively located on the first pre-charge line and the second pre-charge line; the switch component is used for controlling the first pre-charging line to be conducted and the second pre-charging line to be disconnected, or controlling the first pre-charging line to be disconnected and the second pre-charging line to be conducted.
In an embodiment of the present disclosure, the switching assembly may be a switching circuit including a plurality of switching elements; the switching element is an electrical component having a switching characteristic, and may be any type of switch that can be controlled to adjust an on/off state. For example, the switching element may be: a Thin Film Transistor (TFT), a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), a Bipolar Junction Transistor (BJT), an Insulated Gate Bipolar Transistor (IGBT), or the like.
The on-off state of the pre-charging line where each switching element is located can be controlled through the switching states of the switching elements on different pre-charging lines.
In the embodiment of the disclosure, the on-off state of the first pre-charge line is opposite to the on-off state of the second pre-charge line by controlling the on-off states of the switching elements on different pre-charge lines.
When the first pre-charging line is conducted, the second pre-charging line is disconnected, and the pre-charging source charges the photosensitive pixel units in the odd rows in the pixel array in advance through the conducted first pre-charging line; when the first pre-charging line is disconnected, the second pre-charging line is conducted, and the pre-charging source charges the photosensitive pixel units in the even-numbered rows in the pixel array in advance through the conducted second pre-charging line.
The charging circuit charges the photosensitive pixel units in the pixel array line by line so as to collect electric signals output by the photosensitive pixel units in the pixel array line by line. In view of the above, in the embodiment of the present disclosure, the first pre-charge line is connected to the photosensitive pixel units in the odd-numbered rows in the pixel array, the second pre-charge line is connected to the photosensitive pixel units in the even-numbered rows in the pixel array, and the switch assembly controls the conduction states of the first pre-charge line and the second pre-charge line to be opposite, so that when the charging circuit charges the photosensitive pixel units in the odd-numbered rows in the pixel array, the second pre-charge line is controlled to be conducted, and the photosensitive pixel units in the even-numbered rows in the pixel array are pre-charged by the second pre-charge line; or when the charging circuit charges the photosensitive pixel units in the even-numbered rows in the pixel array, the first pre-charging line is controlled to be conducted, and the photosensitive pixel units in the odd-numbered rows in the pixel array are pre-charged by the first pre-charging line.
Therefore, the photosensitive pixel units in each row in the pixel array can be charged and precharged in a crossed manner only through the first precharging line and the second precharging line, the number of the precharging lines in the precharging circuit is reduced, and the structure of the display module is simplified.
In some embodiments, the switch assembly 1032 includes at least:
the first switch element is positioned on the first pre-charging line and used for switching on or off the first pre-charging line;
the second switch element is positioned on the second pre-charging line and used for switching on or off the second pre-charging line;
wherein the switching states of the first switching element and the second switching element are opposite.
In an embodiment of the present disclosure, the first switching element is located on the first pre-charge line, and the second switching element is located on the second pre-charge line; the switching state of the first switching element is opposite to the switching state of the second switching element.
When the first switch element is in a closed state, the second switch element is in an off state, the first pre-charging line is connected, and the second pre-charging line is disconnected; the pre-charging source charges the photosensitive pixel units in the odd rows in the pixel array in advance through the conducted first pre-charging line.
When the first switch element is in an off state, and when the second switch element is in an on state, the first pre-charging line is disconnected, and the second pre-charging line is connected; and the pre-charging power supply stops charging the photosensitive pixel units in the odd rows in the pixel array, and charges the photosensitive pixel units in the even rows in the pixel array in advance through the conducted second pre-charging line.
The first and second switching elements may include: a control end;
the first switch element and the second switch element may switch a switch state according to a control signal received by the control terminal.
It is understood that the control signal received by the first switching element and the control signal received by the second switching element are opposite signals, so that the switching state of the first switching element and the switching state of the second switching element are opposite under the control of the two opposite signals.
According to the embodiment of the disclosure, the first switch element is arranged on the first pre-charging line, the second switch element is arranged on the second pre-charging line, and the switching states of the first switch element and the second switch element are controlled to be opposite, so that the conducting states of the first pre-charging line and the second pre-charging line are opposite, and therefore, the cross charging and pre-charging of photosensitive pixel units in each row in the pixel array can be realized only through the two pre-charging lines and the two switch elements, and the structure of the display module is simplified.
In some embodiments, the charging circuit may include: a first charging line and a second charging line;
the first charging circuit is connected with the output end of the switch circuit of the photosensitive pixel unit in the odd row in the pixel array;
the second charging circuit is connected with the output end of the switch circuit of the photosensitive pixel unit in the even row in the pixel array;
the controlled switching assembly comprises a third switching element and a fourth switching element;
the third switching element is positioned on the first charging line and used for connecting or disconnecting the first charging line with the photosensitive pixel units in odd rows in the pixel array;
the fourth switching element is located on the second charging line and used for switching on or off the connection between the first charging line and photosensitive pixel units in even rows in the pixel array; wherein a switching state of the third switching element is opposite to a switching state of the fourth switching element.
In the embodiment of the present disclosure, since the switching state of the third switching element is opposite to the switching state of the fourth switching element; when the third switch element is in a closed state and the fourth switch element is in an off state, the first charging circuit is switched on, the second charging circuit is switched off, and the photodiodes of the photosensitive pixel units in odd rows in the pixel array are charged through the first charging circuit so as to detect the variation of the electric signals output by the photodiodes of the photosensitive pixel units in odd rows in the pixel array;
when the third switching element is in an off state and the fourth switching element is in a closed state, the first charging circuit is disconnected, and the second charging circuit is connected; and charging the photosensitive diodes of the photosensitive pixel units in the even rows in the pixel array through the second charging circuit so as to detect the variation of the electrical signals output by the photosensitive diodes of the photosensitive pixel units in the even rows in the pixel array.
In some embodiments, the switch assembly 1032 further comprises:
a switch state control circuit connected to the first switch element and the second switch element, respectively, for outputting a first control signal to the first switch element, respectively; and inputting a second control signal to the second switching element; the second control signal is an inverted signal formed by inverting the first control signal.
In an embodiment of the present disclosure, the switching state control circuit is configured to generate a first control signal for controlling a switching state of the first switching element and a second control signal for controlling a switching state of the second switching element, wherein the second control signal is an inverse signal of the first control signal.
If the first control signal is at a first level and the second control signal is at a second level, the first switch element is switched to a closed state, and the second switch element is switched to an off state; the first pre-charging line is conducted, the second pre-charging line is disconnected, and a pre-charging power supply charges the photosensitive diodes of the photosensitive pixel units in the odd-numbered rows in the pixel array in advance through the conducted first pre-charging line;
if the first control signal is at the second level and the second control signal is at the first level, the first switch element is switched to the off state, and the second switch element is switched to the on state; the first pre-charging line is disconnected, and the second pre-charging line is connected; the pre-charging source charges the photosensitive diodes of the photosensitive pixel units in the even rows in the pixel array in advance through the conducted second pre-charging line; wherein the first level is greater than the second level.
The first level is here understood to be a high level, while the second level is a low level relative to the first level.
In some embodiments, the switch state control circuit comprises: a clock signal generating circuit;
the clock signal generating circuit is configured to generate the first control signal that varies in a time domain and form the second control signal by inverting the first control signal.
In an embodiment of the disclosure, the first control signal may be a clock signal, and the second control signal is a clock signal opposite to the first control signal.
The switch state control circuit further comprises: an inverter;
the input end of the phase inverter is connected with the output end of the clock signal generating circuit, and the output end of the phase inverter is connected with the control end of the second switch element; the phase inverter is used for performing reverse processing on the first control signal output by the clock signal generating circuit to obtain a second control signal; and outputting the second control signal to a control terminal of the second switching element;
the output end of the clock signal generating circuit is connected with the control end of the first switch element and used for outputting the generated first control signal to the first switch element.
The switching state of the first switching element is opposite to the switching state of the second switching element under the control of the first control signal and the second control signal.
In other embodiments, an output terminal of the inverter is connected to a control terminal of the third switching element, and an output terminal of the clock signal generation circuit is connected to a control terminal of the fourth switching element;
the on-off state of the first charging line is the same as that of the second pre-charging line, and the on-off state of the second charging line is the same as that of the first pre-charging line.
In the embodiment of the present disclosure, if the first control signal is at a first level, the second control signal is at a second level; the first switching element and the fourth switching element are in a closed state, and the second switching element and the third switching element are in an open state; the photosensitive diodes of the photosensitive pixel units in the odd rows in the pixel array are pre-charged through the conducted first pre-charging line, and the photosensitive diodes of the photosensitive pixel units in the even rows in the pixel array are charged through the conducted second pre-charging line.
If the first control signal is at the second level, the second control signal is at the first level; the first switching element and the fourth switching element are in an off state, and the second switching element and the third switching element are in a closed state; the photosensitive diodes of the photosensitive pixel units in the odd rows in the pixel array are charged through the conducted first charging lines, and the photosensitive diodes of the photosensitive pixel units in the even rows in the pixel array are pre-charged through the conducted second pre-charging lines, wherein the first level is greater than the second level.
According to the embodiment of the disclosure, a first control signal is output through a switch state control circuit, a second control signal is obtained by performing reverse processing on the first control signal, and the on-off states of a charging circuit and a pre-charging circuit are controlled by the first control signal and the second control signal, so that pre-charging of photosensitive pixel units of pixels in odd rows in a pixel array is realized, and charging of photosensitive pixel units of pixels in even rows in the pixel array is realized; or, charging the photosensitive pixel units of the pixels in the odd rows in the pixel array, and precharging the photosensitive pixel units of the pixels in the even rows in the pixel array; therefore, the control of the opposite switch states of the two switch elements is realized only through one switch state control circuit, on one hand, the synchronous switching of the opposite switch states of the two switch elements is ensured, and on the other hand, the structure of the display module is further simplified.
In some embodiments, the first switching element is a first transistor; the second switching element is a second transistor;
the switch state control circuit is respectively connected with the grids of the first transistor and the second transistor; the source electrode and the drain electrode of the first transistor are connected to the first pre-charging line; the source and the drain of the second transistor are connected to the second pre-charge line.
In the embodiment of the present disclosure, the switch state control circuit is respectively connected to the gates of the first transistor and the second transistor, and inputs a first control signal to the gate of the first transistor and a second control signal to the gate of the second transistor;
if the first control signal is at a first level, the second control signal is at a second level, the first transistor is in a saturation state, and the second transistor is in a cut-off state; the first pre-charging line is connected, and the second pre-charging line is disconnected; the pre-charging source charges the photosensitive diodes of the photosensitive pixel units in odd rows in the pixel array in advance through the conducted first pre-charging line.
If the first control signal is at a second level, the second control signal is at a first level, the first transistor is in a cut-off state, and the second transistor is in a saturation state; the first pre-charging line is disconnected, and the second pre-charging line is connected; the second pre-charging line is connected with the second pre-charging line, and the second pre-charging line is connected with the second pre-charging line.
The operating states of the transistor include: a saturation state, a cutoff state, and an amplification state; if the transistor is in a saturation state, the source and the drain are equivalent to the closed state of the switch element; if the transistor is in a cut-off state, the source and the drain are equivalent to the cut-off state of the switching element; if the transistor is in an amplifying state, the transistor can be used for amplifying the electric signal input by the grid electrode and outputting the amplified electric signal by the drain electrode.
In some embodiments, the pixel array is divided into: n regions; wherein N is a positive integer equal to or greater than 2;
the pre-charge sources of the photosensitive pixel cells of different regions are different.
Here, the pixel array may be divided into N regions in a vertical direction;
in the embodiment of the disclosure, the pre-charging sources in different regions are connected to the output ends of the photosensitive pixel units in odd rows in the pixel array corresponding to the region through the first pre-charging line; and the second pre-charging line is connected with the output end of the photosensitive pixel unit in the even row in the pixel array corresponding to the region.
In some embodiments, the pixel array may also be divided laterally into N regions;
it is understood that if the pixel array is divided into N regions, the pre-charging circuit pre-charges the photosensitive pixel units in each column of the pixel array. Namely, the pre-charging sources in different regions are connected with the output ends of the photosensitive pixel units in odd columns in the pixel array corresponding to the regions through first pre-charging lines; and the second pre-charging line is connected with the output ends of the even-numbered columns of photosensitive pixel units in the pixel array corresponding to the region.
According to the embodiment of the disclosure, the precharge power supplies corresponding to different areas are used for precharging the photosensitive pixel units in the corresponding areas through the first precharge line or the second precharge line, so that the pixel array is precharged in a subarea manner, the pixel array is conveniently scanned in a subarea manner, and the power consumption of the display module is reduced.
In some embodiments, the display module further comprises:
the touch panel is stacked with the pixel array;
the control module is connected with the touch panel and used for controlling the pre-charging source of at least one area of the N areas acted by the touch operation to pre-charge the corresponding photosensitive pixel unit according to the position of the touch operation detected by the touch panel.
In an embodiment of the present disclosure, the touch panel may include: a plurality of induction modules; the corresponding areas of different induction modules are different;
a control module comprising: the scanning lines are connected with the induction module in the touch panel; wherein, the induction modules connected with different scanning lines are different;
the control module is used for determining the area of the touch operation detected by the touch panel according to the scanning signal of the scanning line; and controlling the pre-charging source of at least one area of the N areas acted by the touch operation to pre-charge the photosensitive pixel units corresponding to the area.
In this embodiment, the control module may pre-scan each sensing module through the scanning line, and if at least one of the N regions receives a touch operation, the sensing module corresponding to the at least one region generates a sensing signal; the control module determines at least one area where the touch operation is located according to the sensing signal scanned by the scanning line; and controlling a pre-charge power supply corresponding to the at least one region to pre-charge the photosensitive pixel unit corresponding to the region.
In other embodiments, each of the sensing modules may include: a plurality of sensing electrodes; the row positions of the photosensitive pixel units in an area corresponding to different induction electrodes are different;
each scanning line in the control module is respectively connected with the driving electrode strips in the touch panel, and the driving electrode strips connected with different scanning lines are different;
the control module is used for determining an area where a touch operation detected by the touch panel is located and a row position in the area according to a scanning signal of the scanning line; and controlling the pre-charging source of at least one area of the N areas acted by the touch operation to pre-charge the photosensitive pixel units corresponding to the row position.
In this embodiment, the control module may pre-scan each sensing electrode through the scanning line, and if at least one of the N areas receives a touch operation, the sensing electrode corresponding to at least one row position in the at least one area acted by the touch operation generates a sensing signal; the control module determines at least one region where the touch operation is located and at least one row position in the region according to the sensing signal scanned by the scanning line, and controls a pre-charging source corresponding to the at least one region to pre-charge a photosensitive pixel unit corresponding to the row position.
Fig. 6 is a flowchart of a fingerprint detection method shown in an embodiment of the present disclosure, and as shown in fig. 6, the method is applied to a display module shown in one or more technical solutions, where the fingerprint detection method includes:
s11, when a fingerprint is scanned through a pixel array, through a pre-charging circuit, before a charging circuit charges a photosensitive diode of a photosensitive pixel unit contained in the pixel array, the photosensitive diode of the photosensitive pixel unit is charged in advance;
step S12, charging a photosensitive diode of the photosensitive pixel unit through the charging circuit;
and S13, detecting the electric signal of the photosensitive diode of the charged photosensitive pixel unit.
In the embodiment of the disclosure, the fingerprint detection method is applied to the display module, and when a pixel array scans fingerprints, the photosensitive diodes of corresponding photosensitive pixel units in the pixel array are charged in advance through a pre-charging circuit; and then the photosensitive diodes of the photosensitive pixel units are charged by a charging circuit so as to ensure that each photosensitive pixel unit in the pixel array has enough charging time, and the change of the light intensity of a return light signal received by the photosensitive diodes can be accurately reflected through the voltage change of the output end of a switching circuit in the photosensitive pixel units.
The fingerprint information collected by the photosensitive pixel unit can be determined according to the variation of the electric signal by detecting the electric signal at the output end of the switch circuit of the charged photosensitive pixel unit.
It should be noted that the variation of the electrical signal at the output end of the switching circuit can reflect the variation of the electrical signal output by the photodiode, that is, can reflect the light intensity variation of the return light signal received by the photodiode; therefore, the fingerprint information collected by the photosensitive pixel unit can be directly determined according to the variation of the electric signal at the output end of the switch circuit.
In some embodiments, when scanning a fingerprint through a pixel array in step S11, charging, by a pre-charging circuit, a photodiode of a photosensitive pixel unit included in the pixel array in advance before the photosensitive diode is charged by a charging circuit, includes:
the first pre-charging line of the display module is controlled to be connected and the second pre-charging line is controlled to be disconnected through the switch state control circuit, and the photosensitive diodes of the photosensitive pixel units in the odd-numbered rows are charged in advance by the connected first pre-charging line before the charging circuit charges the photosensitive diodes of the photosensitive pixel units in the odd-numbered rows corresponding to the pixel array;
or the second pre-charging line of the display module is controlled to be conducted and the first pre-charging line is controlled to be disconnected through the switch state control circuit, and the photosensitive diodes of the photosensitive pixel units in the even-numbered rows are charged in advance by the conducted second pre-charging line before the charging circuit charges the photosensitive diodes of the photosensitive pixel units in the even-numbered rows corresponding to the pixel array.
In the embodiment of the present disclosure, a first switching element is disposed on the first pre-charge line, and a second switching element is disposed on the second pre-charge line; the switch state control circuit is respectively connected with the control ends of the first switch element and the second switch element, and is used for outputting a first control signal for controlling the switch state of the first switch element and a second control signal for controlling the switch state of the second switch element, wherein the second control signal is a reverse signal of the first control signal.
If the first control signal is at a first level and the second control signal is at a second level, the first switch element is in a closed state and the second switch element is in an off state; the first pre-charging line is in a conducting state, and the second pre-charging line is in a disconnecting state; before a charging circuit charges the photosensitive pixel units corresponding to the odd-numbered rows of the pixel array, the photosensitive pixel units corresponding to the odd-numbered rows of the pixel array are charged in advance through a first conducting pre-charging line;
if the first control signal is at the second level and the second control signal is at the first level, the first switch element is in an off state and the second switch element is in a closed state; the first pre-charging line is in a disconnected state, and the second pre-charging line is in a conducting state; before the charging circuit charges the photosensitive pixel units corresponding to the even-numbered rows of the pixel array, the photosensitive pixel units corresponding to the even-numbered rows of the pixel array are charged in advance through the conducted second pre-charging line.
In some embodiments, in the step S11, when scanning a fingerprint through a pixel array, charging, through a pre-charge line, a photodiode of a photosensitive pixel unit included in the pixel array in advance before a charging circuit charges the photodiode, including:
controlling the conducting of a pre-charging line of at least one area in N areas of the pixel array acted by the touch operation according to the position of the touch operation detected by the touch panel; wherein N is a positive integer equal to or greater than 2;
before the charging circuit charges the photosensitive diode of the photosensitive pixel unit contained in the at least one area corresponding pixel array, the photosensitive diode of the photosensitive pixel unit is charged in advance through the conducting pre-charging line by the at least one area corresponding pre-charging source.
In the embodiment of the disclosure, the precharge sources of the photosensitive pixel units in different regions are different. The touch panel may include: a plurality of induction modules; the corresponding areas of different induction modules are different.
Determining a target area where the touch operation is located according to the touch operation detected by at least one induction module on the touch panel; before the charging circuit charges the photosensitive pixel units in the target area, the pre-charging source corresponding to the target area is controlled to charge the photosensitive pixel units in the target area in advance.
Therefore, before the photosensitive pixel units in the pixel array are charged through the charging circuit, the photosensitive pixel units in the corresponding areas are pre-charged through the pre-charging sources corresponding to the different areas in advance; the partition precharge of the pixel array is realized, so that the pixel array is conveniently subjected to partition scanning, and the power consumption of the display module is reduced.
In other embodiments, the sensing module may include: a plurality of sensing electrodes; the row positions of the photosensitive pixel units in an area corresponding to different induction electrodes are different;
determining a target area where the touch operation is located and a line position in the target area according to the touch operation detected by at least one induction electrode of at least one induction module; before the charging circuit charges the photosensitive pixel units in the target area, controlling a pre-charging source corresponding to the target area, and charging the photosensitive pixel units corresponding to the row positions in the target area in advance.
In combination with any one of the above technical solutions, a specific example is provided below, and the present disclosure provides a display module, including:
the pixel array comprises a plurality of photosensitive pixel units distributed in an array; each photosensitive pixel unit comprises: a photodiode and a switching circuit; the input end of the switch circuit is connected with the photosensitive diode;
the charging circuit is connected with the output end of the switch circuit and used for charging the corresponding photosensitive pixel unit through the charging circuit;
a pre-charge circuit, comprising: the device comprises a pre-charging line, a switch assembly and a pre-charging power supply;
the pre-charging line is connected to the output end of each switch circuit; the switch assembly is used for conducting or disconnecting the pre-charging line.
The pre-charging source is connected with the pre-charging line and used for charging the photosensitive diode corresponding to the photosensitive pixel unit in advance through the conducted pre-charging line before the charging circuit charges the photosensitive diode corresponding to the photosensitive pixel unit when the pixel array performs fingerprint scanning.
In an embodiment of the present disclosure, the switching circuit may include: a plurality of switching elements; the switching element may be a transistor;
exemplarily, as shown in fig. 7, fig. 7 is a schematic structural diagram of a photosensitive pixel unit according to an exemplary embodiment. The photosensitive pixel cell includes: a photodiode PD and a switching circuit; wherein the switching circuit comprises: reset transistor T RST Starting transistor T SEL Signal transistor T SF 。
Reset transistor T RST Is connected to a reset power supply V RST The grid electrode receives a reset signal, and the source electrode is connected with the first node P; the signal transistor T SF Is connected to the reset transistor T RST The signal transistor T, the signal transistor T SF Is connected with a power supply V DD Said signal transistor T SF Is connected to a second node Q; the starting transistor T SEL Is connected to a second node Q, the start-up transistor T SEL The grid of the grid receives a starting signal; the starting transistor T SEL I.e. the output terminal OUT and the charge of the switching circuitAnd (7) connecting the circuits. The first end of the photodiode PD is connected to the first node P.
The working principle of the photosensitive pixel unit is as follows: as shown in fig. 8, fig. 8 is a timing diagram illustrating control signals of a light-sensitive pixel cell according to an exemplary embodiment. When the reset transistor T is turned on RST The received reset signal is high level, and the starting transistor T SEL When the received start signal is also high level, the reset transistor T RST And said start-up transistor T SEL Are all in an open state; the reset transistor T RST Resetting the potential of the first node P, wherein the potential of the point P is V RST -V th (ii) a Wherein, the V th For the reset transistor T RST The threshold voltage of (2). Acquiring the voltage V of the output end OUT of the switching circuit at the moment t1 OUT1 . Then, when the reset transistor T is turned on RST The received reset signal is high level, and the starting transistor T SEL When the received starting signal is low level, the reset transistor T RST And said start-up transistor T SEL Are all in an off state; the photosensitive diode PD starts to work under the action of reverse voltage, receives a return light signal, converts the return light signal into an electric signal and outputs the electric signal; at this time, the potential of the first node P will decrease; when the starting transistor T is turned on SEL When the received starting signal is high level, the starting transistor T SEL Switching from an off state to an on state; acquiring the voltage V of the output end OUT of the switching circuit at the moment t2 OUT2 (ii) a And determining the light intensity variation of the return light signal varied on the photodiode PD according to the voltage variation of the output end OUT of the switching circuit.
As shown in fig. 9, fig. 9 is a schematic diagram illustrating potential changes of the first node P, the second node Q and the start signal of the photosensitive pixel unit according to an exemplary embodiment. Wherein reference numeral 901 denotes a transition period of the second node Q; reference numeral 902 denotes a period of constant velocity change of the second node Q; reference numeral 903 denotes a stabilization period of the second node Q.
When the photosensitive pixel unit normally works, after the time point of t1, due to the reset signalThe signal and the starting signal are both low level; the starting transistor T SEL In the off state, the voltage of the second node Q gradually rises and is finally stable; when the time point of t2 is up, the reset signal is at low level, and the start signal is at high level; the starting transistor T SEL Switching to an on state, and charging the photosensitive pixel unit by a charging circuit; the voltage of the second node Q is reduced, namely the second node Q is in a transition period; after the time point t3, the voltage dropping speed of the second node Q is kept consistent with the voltage dropping speed of the first node P, namely the second node Q is in the same-speed change period; at the time point t4, the voltage of the second node Q remains stable, that is, the second node Q is in a stable period. Voltage change quantity DeltaV of second node Q Q And the voltage quantity DeltaV of the first node P P The same; and the output end OUT of the switch circuit can reflect the voltage of the second node Q; therefore, the voltage variation of the first node P can be accurately determined according to the voltage variation of the output terminal OUT of the switching circuit, so as to reflect the light intensity variation of the returning light signal varying on the photodiode PD.
It should be noted that, when the signal transistor T is used SF Operating in the saturation region due to the transistor T being turned on SEL When the charging circuit is in an on state and the output end of the switching circuit is connected, the charging circuit is equivalent to the signal transistor T SF Charging the source electrode of (1); then the signal transistor T SF The current between the drain and the source is kept constant, and the voltage between the grid and the source is also kept constant; and a signal transistor T SF A gate of the transistor is connected to the first node P, and a source of the transistor is connected to the second node Q, thereby the signal transistor T SF The voltage from the gate to the source is kept constant, i.e. the voltage difference between the first node P and the second node Q is kept constant, and the voltage of the second node Q is changed along with the voltage change of the first node P.
When the pixel array is used for fingerprint scanning, the charging circuit is sequentially connected to each photosensitive pixel unit in the pixel array to charge the photosensitive diode of each photosensitive pixel unit; if the photosensitive pixel cell is a far-end pixel cell, the photosensitive pixel cell will be communicated with the charging circuit later than a near-end pixel cell. Therefore, compared with a near-end pixel unit, the charging time of the photosensitive pixel unit is shorter, so that the variation of the electric signal of the output end of the switch circuit in the photosensitive pixel unit is smaller than that of the electric signal output by the photodiode, and the light intensity variation of a return light signal received by the photodiode cannot be accurately reflected.
Exemplarily, taking the 1 st photosensitive pixel unit as the far-end photosensitive pixel unit as an example, as shown in fig. 10, fig. 10 is a schematic diagram illustrating potential changes of the first node P, the second node Q and the start signal of the far-end photosensitive pixel unit according to an exemplary embodiment. The integration time of the far-end photosensitive pixel unit is shortened relative to that of the photosensitive pixel unit shown in fig. 9, and at a time point tn, the electric signal output by the 1 st photosensitive pixel unit is collected; due to t2<tn<t3, i.e. the transition period of the second node Q at the sampling time point, when the potential falling speed of the second node Q does not coincide with the first node P, i.e. Δ V Q ′<△V P '; the signal quantity output from the 1 st photosensitive pixel unit is insufficient, and the electric signal variation of the second node Q cannot accurately reflect the electric signal variation of the first node P, that is, the light intensity variation of the return light signal received by the photodiode cannot be accurately reflected, so that the signal-to-noise ratio of the fingerprint detection signal collected by the far-end photosensitive pixel unit is reduced.
In order to avoid this phenomenon, in the embodiments of the present disclosure, before the charging circuit charges the photosensitive pixel unit corresponding to the pixel array, the photosensitive pixel unit is charged in advance through the pre-charging circuit, so as to ensure that each photosensitive pixel unit in the pixel array has sufficient charging time.
Illustratively, as shown in fig. 10, by charging the photosensitive pixel unit in advance, the potential of the second node Q starts to fall in advance, and when the start signal is at a high level, the speed of the potential falling of the second node Q and the speed of the potential falling of the first node P are kept the same, i.e., there is no transition period for the second node Q; at this time, at time point tn, the electrical signal Δ V output by the 1 st photosensitive pixel unit is acquired QPRE ′＝△V P ' that is, the electrical signal variation of the second node Q can accurately reflect the electrical signal variation of the first node P, and the signal-to-noise ratio of the fingerprint detection signal collected by the far-end photosensitive pixel unit is improved.
In an embodiment of the present disclosure, the precharge circuit may include: a first pre-charge line and a second pre-charge line;
the first pre-charging line is connected with the output ends of the switch circuits of the photosensitive pixel units in the odd rows in the pixel array;
the second pre-charging line is connected with the output ends of the switch circuits of the photosensitive pixel units in the even rows in the pixel array;
the switch assembly includes at least:
the first switch element is positioned on the first pre-charging line and used for switching on or off the first pre-charging line;
the second switch element is positioned on the second pre-charging line and used for switching on or off the second pre-charging line;
a clock signal generating circuit connected to the first switching element and the second switching element, respectively, for generating a first control signal for controlling a switching state of the first switching element and a second control signal for controlling a switching state of the second switching element; wherein the second control signal is an inverse signal of the first control signal.
The charging circuit may include: the first charging circuit, the second charging circuit, the third switching element and the fourth switching element;
the first charging circuit is connected with the output ends of the switching circuits of the photosensitive pixel units in odd rows in the pixel array;
the second charging line is connected with the output ends of the switching circuits of the photosensitive pixel units in the even rows in the pixel array;
the third switch element is positioned on the first charging line and used for switching on or switching off the first charging line;
the fourth switch element is located on the second charging line and used for switching on or off the second charging line;
wherein a switching state of the third switching element is the same as a switching state of the second switching element; the switching state of the fourth switching element is the same as the switching state of the first switching element.
Exemplarily, as shown in fig. 11, fig. 11 is a schematic structural diagram of a display module according to an exemplary embodiment. Wherein said fig. 11 only shows the first column of light sensitive pixel cells in the pixel array. The output ends of the light-sensitive pixel units in the odd-numbered rows in the pixel array are connected to a first line PRE1, and the output ends of the light-sensitive pixel units in the even-numbered rows are connected to a second line PRE2; the first line PRE1 is connected to a PRE-charge current source I through a first transistor PRE The second line PRE2 is connected to a PRE-charge current source I through a second transistor PRE (ii) a The first circuit is connected to a charging current source I through a third transistor BIAS The second line is connected to a charging current source I through a fourth transistor BIAS . The grids of the first transistor and the fourth transistor are connected with a first clock signal CK1, and the grids of the second transistor and the third transistor are connected with a second clock signal CK1'; the second clock signal CK1' is an inverted signal of the first clock signal CK 1.
As shown in fig. 12, fig. 12 is a timing diagram illustrating control signals of a display module according to an exemplary embodiment. When the fingerprint starts to be pressed, the first clock signal CK1 is at a high level, the second clock signal CK1' is at a low level, the reset signal RST #1 of the 1 st photosensitive pixel unit is at a high level, and the start signal SEL #1 is at a high level; the reset signal # W +1 of the W +1 th photosensitive pixel unit is also at a high level, and the start signal SEL # W +1 is at a high level; at this time, the start transistors T of the 1 st and W +1 st light-sensitive pixel units SEL Are all in an open state; the second transistor and the third transistor are also in an on state; the charging current source I BIAS Is communicated with the 1 st photosensitive pixel unit through the conducted first line, and carries out the first of the 1 st photosensitive pixel unit at the time point of t1Acquiring secondary data to obtain voltage V of output end of 1 st photosensitive pixel unit OUT1 (ii) a The pre-charging current source I PRE The W +1 photosensitive pixel unit is pre-charged by communicating with the W +1 photosensitive pixel unit through a conducted second line;
subsequently, the first clock signal CK1 is switched to a low level, the second clock signal CK1' is switched to a high level, the reset signal RST #1 of the 1 st photosensitive pixel unit is at a low level, and the start signal SEL #1 is at a low level; the reset signal # W +1 of the W +1 th photosensitive pixel unit is still at a high level, and the start signal SEL # W +1 is also at a high level; while the reset signal #2W +1 of the 2W +1 photosensitive pixel unit is switched to high level, the start signal SEL #1W +1 is also switched to high level; at this time, the start transistor T of the 1 st photosensitive pixel unit SEL In an OFF state, the starting transistors T of the W +1 st and 2W +1 st photosensitive pixel units SEL Are all in an open state; the first transistor and the fourth transistor are in an open state; the charging current source I BIAS The first-time data acquisition of the W +1 photosensitive pixel unit is carried out at a time point t 3; the pre-charging current source I PRE The 2W +1 st photosensitive pixel unit is precharged by connecting the turned-on first line with the 2W +1 st photosensitive pixel unit.
Therefore, when the charging current source charges the photosensitive pixel units in the upper row and performs data acquisition, the pre-charging current source pre-charges the photosensitive pixel units in the lower row until the first data acquisition of the photosensitive pixel units in the last row in the pixel array is completed.
Then, starting second data acquisition of the pixel array, namely switching the first clock signal CK1 to a high level, switching the second clock signal CK1' to a low level, switching the start signal SEL #1 of the 1 st photosensitive pixel unit to a high level, and switching the start signal SEL # W +1 of the W +1 th photosensitive pixel unit to a high level; at this time, the start transistors T of the 1 st and W +1 th light-sensitive pixel units SEL Are all in an open state; the second transistor and the third transistor are also in an open stateState; the charging current source I BIAS The 1 st photosensitive pixel unit is communicated with the 1 st photosensitive pixel unit again through the conducted first line, and second data acquisition of the 1 st photosensitive pixel unit is carried out at the time point of t2 to obtain the voltage V of the output end of the 1 st photosensitive pixel unit OUT2 (ii) a The pre-charging current source I PRE The W +1 photosensitive pixel unit is pre-charged by communicating with the W +1 photosensitive pixel unit through a conducted second line; here, the voltage difference V of the 1 st photosensitive pixel cell OUT2 -V OUT1 I.e. the signal variation on the photodiode PD in the 1 st light-sensitive pixel unit.
When the first clock signal CK1 is switched to a low level, the second clock signal CK1' is switched to a high level, and the start signal SEL #1 of the 1 st photosensitive pixel unit is switched to a low level; the start signal SEL # W +1 of the W +1 th photosensitive pixel unit is still high level; the enable signal SEL #1W +1 of the 2W +1 photosensitive pixel unit is also switched to a high level; at this time, the start transistor T of the 1 st photosensitive pixel unit SEL In an OFF state, the starting transistors T of the W +1 st and 2W +1 st photosensitive pixel units SEL Are all in an open state; the first transistor and the fourth transistor are in an on state; the charging current source I BIAS The second line is communicated with the W +1 photosensitive pixel unit through the conducted second line, and second data acquisition of the W +1 photosensitive pixel unit is carried out at a time point t 4; the pre-charging current source I PRE The 2W +1 photosensitive pixel unit is precharged by the turned-on first line being communicated with the 2W +1 photosensitive pixel unit. And determining the signal variation quantity on the photosensitive diode PD in the W +1 th photosensitive pixel unit according to the difference value of the two acquired data of the W +1 th photosensitive pixel unit.
In this way, second data acquisition of each row of photosensitive pixel units in the pixel array is sequentially completed, and signal variation on the photosensitive diodes PD in each row of photosensitive pixel units is respectively determined according to the difference value of the two acquired data of each row of photosensitive pixel units; so as to determine fingerprint information according to the variation of each signal.
According to the embodiment of the disclosure, the on-off state of the first line and the second line is controlled, so that when data acquisition is performed on the previous row of photosensitive pixel units, the next row of photosensitive pixel units are precharged, the charging time of each row of photosensitive pixel units in the pixel array is prolonged, and the problems of data acquisition quantity reduction and signal-to-noise ratio reduction caused by insufficient charging time are avoided.
In other embodiments, the pixel array may be divided into N regions, where N is a positive integer equal to or greater than 2;
the pre-charge power supplies of the photosensitive pixel units in different regions are different;
the display module assembly still includes: the touch panel is stacked with the pixel array;
the control module is connected with the touch panel and used for controlling the pre-charging source of at least one area of the N areas acted by the touch operation to pre-charge the corresponding photosensitive pixel unit according to the position of the touch operation detected by the touch panel.
Illustratively, as shown in fig. 13, fig. 13 is a first schematic diagram illustrating a structure of a pixel array according to an exemplary embodiment; if a row of the pixel array comprises W photosensitive pixel units, the pixel array is longitudinally divided into N areas, then a row of each area comprises W/N photosensitive pixel units, correspondingly, the display module comprises W/N charging current sources I BIAS And W/N precharge current sources I PRE (ii) a If the touch panel detects a touch operation, the control module controls a charging current source I of a target area corresponding to the touch operation according to the target area of the touch operation detected by the touch panel BIAS And a precharge current source I PRE And carrying out data acquisition and pre-charging on the photosensitive pixel units in the target area.
Further exemplarily, as shown in fig. 14, fig. 14 is a schematic structural diagram two of the pixel array shown according to an exemplary embodiment; if a row of the pixel array comprises W photosensitive pixel units, and the pixel array is divided into M × N areas horizontally and vertically, then there are W/N photosensitive pixel units in a row in each area, correspondinglyThe display module comprises W/N charging current sources I BIAS And W/N pre-charge current sources I PRE (ii) a If the touch panel detects a touch operation, the control module controls a charging current source I of a target area to which the touch operation aims according to the target area in which the touch operation detected by the touch panel is located BIAS And a precharge current source I PRE And carrying out data acquisition and pre-charging on the photosensitive pixel units in the target area and the area above the target area.
The embodiment of the disclosure controls the charging current source I of the target area by partitioning the pixel array and detecting the target area where the touch operation is located BIAS And a pre-charge current source I PRE And the photosensitive pixel units in the target area are subjected to data acquisition and pre-charging, so that the power consumption of the display module can be effectively reduced.
The present disclosure also provides a display apparatus, including:
the display module shown in one or more technical schemes;
the fingerprint identification module, with the display module assembly is connected, is used for acquireing the fingerprint detection signal of display module assembly scanning, according to fingerprint detection signal carries out fingerprint identification.
In the embodiment of the disclosure, when a touch operation is detected, the photosensitive pixel unit is charged in advance through the pre-charging line when the fingerprint is scanned through the pixel array; charging corresponding photosensitive pixel units in a pixel array through a charging circuit so as to acquire fingerprint detection signals scanned by the corresponding photosensitive pixel units in the pixel array; according to the fingerprint detection signal, the fingerprint image is determined through the fingerprint identification module, and fingerprint identification is carried out.
FIG. 15 is a diagram illustrating a fingerprint sensing device according to one exemplary embodiment. Applied to the display device shown in the above technical solution, referring to fig. 15, the fingerprint detection apparatus 200 includes:
the pre-charging module 201 is configured to, when a pixel array scans a fingerprint, pre-charge a photodiode of a photosensitive pixel unit through a pre-charging line before a charging circuit charges the photodiode of the photosensitive pixel unit;
the detection module 202 is configured to charge a photodiode of the photosensitive pixel unit through the charging circuit; and detecting the electric signal of the charged photosensitive diode of the photosensitive pixel unit.
Optionally, the pre-charge line comprises: a first pre-charge line and a second pre-charge line;
the pre-charging module is specifically configured to:
the first pre-charging line is controlled to be conducted and the second pre-charging line is controlled to be disconnected through the switch state control circuit, and the photosensitive diodes of the photosensitive pixel units in the odd-numbered rows are charged in advance by the conducted first pre-charging line before the charging circuit charges the photosensitive diodes of the photosensitive pixel units in the odd-numbered rows corresponding to the pixel array;
or, the second pre-charging line is controlled to be connected and the first pre-charging line is controlled to be disconnected through the switch state control circuit, and the photodiodes of the photosensitive pixel units in the even-numbered rows of the pixel array are charged in advance by the connected second pre-charging line before the charging circuit charges the photodiodes of the photosensitive pixel units in the even-numbered rows.
Optionally, the pixel array is divided into: n regions; wherein N is a positive integer equal to or greater than 2;
the pre-charging module is specifically configured to:
controlling the pre-charging line of at least one area of the N areas acted by the touch operation to be conducted according to the position of the touch operation detected by the touch panel; before the charging circuit charges the photosensitive diode of the photosensitive pixel unit contained in the at least one area corresponding pixel array, the photosensitive diode of the photosensitive pixel unit is charged in advance through the conducting pre-charging line by the at least one area corresponding pre-charging source.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Fig. 16 is a block diagram illustrating an electronic device apparatus 800 in accordance with an example embodiment. For example, the device 800 may be a mobile phone, a mobile computer, or the like.
Referring to fig. 16, the apparatus 800 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, and communications component 816.
The processing component 802 generally controls overall operation of the device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.
The memory 804 is configured to store various types of data to support operation at the device 800. Examples of such data include instructions for any application or method operating on device 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
A power supply component 806 provides power to the various components of the device 800. The power components 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the apparatus 800.
The multimedia component 808 includes a screen that provides an output interface between the device 800 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the device 800 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the apparatus 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.
The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the device 800. For example, the sensor assembly 814 may detect the open/closed state of the device 800, the relative positioning of the components, such as a display and keypad of the apparatus 800, the sensor assembly 814 may also detect a change in position of the apparatus 800 or a component of the apparatus 800, the presence or absence of user contact with the apparatus 800, orientation or acceleration/deceleration of the apparatus 800, and a change in temperature of the apparatus 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object in the absence of any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 816 is configured to facilitate communications between the apparatus 800 and other devices in a wired or wireless manner. The device 800 may access a wireless network based on a communication standard, such as Wi-Fi,2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the apparatus 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 804 comprising instructions, executable by the processor 820 of the device 800 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (15)

1. The utility model provides a display module assembly with fingerprint detection function which characterized in that, display module assembly includes:
a pixel array, wherein the pixel array comprises: a plurality of photosensitive pixel units distributed in an array; each of the photosensitive pixel cells includes: a photodiode and a switching circuit; the input end of the switch circuit is connected with the photosensitive diode;
the charging circuit is connected with the output end of the switch circuit and used for charging the corresponding photosensitive pixel unit through the charging circuit;
the pre-charging circuit is connected with the output end of the switch circuit and used for charging the photosensitive diode of the corresponding photosensitive pixel unit in advance through the pre-charging circuit before the charging circuit charges the photosensitive diode of the corresponding photosensitive pixel unit when the pixel array carries out fingerprint scanning.
2. The display module of claim 1, wherein the pre-charge circuit comprises:
a pre-charge line connected to an output terminal of each of the switching circuits;
the switch assembly is positioned on the pre-charging line and used for switching on or off the pre-charging line;
and the pre-charging source is connected with the pre-charging line and used for charging the photosensitive diode of the corresponding photosensitive pixel unit in advance through the conducted pre-charging line.
3. The display module of claim 1, wherein the pre-charge circuit comprises:
the first pre-charging line is connected with the output ends of the switch circuits of the photosensitive pixel units in the odd rows in the pixel array;
the second pre-charging line is connected with the output ends of the switch circuits of the photosensitive pixel units in the even rows in the pixel array;
the switch assembly comprises a plurality of switch elements which are respectively positioned on the first pre-charging line and the second pre-charging line; the switch component is used for controlling the first pre-charging line to be conducted and the second pre-charging line to be disconnected, or controlling the first pre-charging line to be disconnected and the second pre-charging line to be conducted.
4. The display module of claim 3, wherein the switch assembly comprises at least:
the first switch element is positioned on the first pre-charging line and used for switching on or off the first pre-charging line;
the second switch element is positioned on the second pre-charging line and used for switching on or off the second pre-charging line;
wherein the first switching element and the second switching element are in opposite switching states.
5. The display module of claim 4, wherein the switch assembly further comprises:
a switch state control circuit connected to the first switch element and the second switch element, respectively, for outputting a first control signal to the first switch element, respectively; and inputting a second control signal to the second switching element; the second control signal is an inverted signal formed by inverting the first control signal.
6. The display module of claim 5, wherein the switch state control circuit comprises: a clock signal generating circuit;
the clock signal generating circuit is configured to generate the first control signal varying in a time domain and to form the second control signal by inverting the first control signal.
7. The display module of claim 5, wherein the first switching element is a first transistor; the second switching element is a second transistor;
the switch state control circuit is respectively connected with the grids of the first transistor and the second transistor; the source electrode and the drain electrode of the first transistor are connected to the first pre-charging line; the source and the drain of the second transistor are connected to the second precharge line.
8. The display module of claim 1, wherein the pixel array is divided into: n areas; wherein N is a positive integer equal to or greater than 2;
the pre-charge sources of the photosensitive pixel cells of different regions are different.
9. The display module assembly of claim 8, wherein the display module assembly further comprises:
the touch panel is stacked with the pixel array;
the control module is connected with the touch panel and used for controlling the pre-charging power supply of at least one area of the N areas acted by the touch operation to pre-charge the corresponding photosensitive pixel unit according to the position of the touch operation detected by the touch panel.
10. A display device, comprising:
a display module according to any one of claims 1-9;
the fingerprint identification module, with the pixel is filled the module in advance and is connected for acquire the fingerprint detection signal of pixel pre-charge module scanning, according to fingerprint detection signal carries out fingerprint identification.
11. A fingerprint detection method applied to the display module according to any one of claims 1 to 9, the method comprising:
when a fingerprint is scanned through a pixel array, through a pre-charging circuit, before a charging circuit charges a photosensitive diode corresponding to a photosensitive pixel unit contained in the pixel array, the photosensitive diode of the photosensitive pixel unit is charged in advance;
charging, by the charging circuit, a photodiode of the photosensitive pixel unit;
and detecting the electric signal of the charged photosensitive diode of the photosensitive pixel unit.
12. The method of claim 11, wherein the pre-charging circuit pre-charges a photodiode of a photosensitive pixel cell included in the pixel array before a charging circuit charges the photodiode when the pixel array scans the fingerprint, and the pre-charging circuit comprises:
the first pre-charging line of the display module is controlled to be connected and the second pre-charging line is controlled to be disconnected through the switch state control circuit, and the photosensitive diodes of the photosensitive pixel units in the odd-numbered rows are charged in advance by the connected first pre-charging line before the charging circuit charges the photosensitive diodes of the photosensitive pixel units in the odd-numbered rows corresponding to the pixel array;
or the second pre-charging line of the display module is controlled to be connected and the first pre-charging line is controlled to be disconnected through the switch state control circuit, and the photodiodes of the photosensitive pixel units in the even-numbered rows are charged in advance by the connected second pre-charging line before the charging circuit charges the photodiodes of the photosensitive pixel units in the even-numbered rows corresponding to the pixel array.
13. The method of claim 11, wherein the charging, via a pre-charge line, a photodiode of a photosensitive pixel cell included in the pixel array in advance before a charging circuit charges the photodiode when the fingerprint is scanned by the pixel array comprises:
controlling the conducting of a pre-charging line of at least one area in N areas of the pixel array acted by the touch operation according to the position of the touch operation detected by the touch panel; wherein N is a positive integer equal to or greater than 2;
before the charging circuit charges the photosensitive diode of the photosensitive pixel unit contained in the at least one area corresponding pixel array, the photosensitive diode of the photosensitive pixel unit is charged in advance through the conducting pre-charging line by the at least one area corresponding pre-charging source.
14. A fingerprint detection device comprising:
a processor;
a memory for storing executable instructions;
wherein the processor is configured to: -when executing executable instructions stored in said memory, implementing the fingerprint detection method of any one of claims 11 to 13.
15. A non-transitory computer readable storage medium having instructions therein which, when executed by a processor of a fingerprint detection device, enable the fingerprint detection device to perform the fingerprint detection method of any one of claims 11 to 13.
CN202110454306.4A 2021-04-26 2021-04-26 Display module, display equipment, fingerprint detection method, fingerprint detection device and storage medium Pending CN115328328A (en)

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CN202110454306.4A CN115328328A (en) 2021-04-26 2021-04-26 Display module, display equipment, fingerprint detection method, fingerprint detection device and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110454306.4A CN115328328A (en) 2021-04-26 2021-04-26 Display module, display equipment, fingerprint detection method, fingerprint detection device and storage medium

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