WO2020248169A1 - 纹路图像获取方法、纹路图像获取电路及显示面板 - Google Patents

纹路图像获取方法、纹路图像获取电路及显示面板 Download PDF

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Publication number
WO2020248169A1
WO2020248169A1 PCT/CN2019/090957 CN2019090957W WO2020248169A1 WO 2020248169 A1 WO2020248169 A1 WO 2020248169A1 CN 2019090957 W CN2019090957 W CN 2019090957W WO 2020248169 A1 WO2020248169 A1 WO 2020248169A1
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WIPO (PCT)
Prior art keywords
sub
circuit
integration period
photosensitive
collection value
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PCT/CN2019/090957
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English (en)
French (fr)
Inventor
王佳斌
丁小梁
曹学友
王文娟
刘静
张宜驰
王海生
王雷
刘英明
王迎姿
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Priority to PCT/CN2019/090957 priority Critical patent/WO2020248169A1/zh
Priority to US16/767,932 priority patent/US11314961B2/en
Priority to CN201980000823.5A priority patent/CN112400172A/zh
Priority to JP2021504757A priority patent/JP7405826B2/ja
Priority to EP19932487.2A priority patent/EP3985550A4/en
Publication of WO2020248169A1 publication Critical patent/WO2020248169A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1365—Matching; Classification
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1365—Matching; Classification
    • G06V40/1376—Matching features related to ridge properties or fingerprint texture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/50—Control of the SSIS exposure
    • H04N25/53—Control of the integration time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/70—SSIS architectures; Circuits associated therewith

Definitions

  • the embodiments of the present disclosure relate to a method for acquiring a pattern image, a pattern image acquiring circuit, and a display panel.
  • At least one embodiment of the present disclosure provides a pattern image acquisition method for a pattern image acquisition circuit
  • the pattern image acquisition circuit includes a photosensitive circuit
  • the pattern image acquisition method includes: causing the photosensitive circuit to receive light from the pattern, And based on the signal amount accumulated by the photosensitive circuit in the first integration period, a first curve is obtained.
  • the first curve is a curve of the residual signal amount over time, and the residual signal amount is the The amount of signal remaining before the first integration period is the amount of signal remaining after time is released; the first acquisition value is obtained based on the signal amount accumulated by the photosensitive circuit in the second integration period, and the second integration period is in the After the first integration period; and based on the first curve and the first acquisition value, a first photosensitive signal of the image of the texture is obtained.
  • obtaining the first photosensitive signal based on the first curve and the first acquisition value includes: obtaining the residual signal amount based on the first curve The amount of signal released in the second integration period is recorded as a first reference value; and the first collected value is subtracted from the first reference value to obtain the first light-sensing signal.
  • obtaining the first curve based on the signal amount accumulated by the photosensitive circuit in the first integration period includes: making the first integration period include N Sub-integration period; at the end of the n-th sub-integration period, the signal amount accumulated by the photosensitive circuit in the n-th sub-integration period is obtained and recorded as the n-th sub-collection value; and the first sub-collection value is obtained according to the N sub-collection values Curve; N is greater than or equal to 2, and n satisfies 1 ⁇ n ⁇ N.
  • acquiring the first curve based on the signal amount accumulated by the photosensitive circuit in the first integration period includes: making the first integration period include the first A sub-integration period, a second sub-integration period, and a third sub-integration period; at the end of the first sub-integration period, the signal amount accumulated by the photosensitive circuit in the first sub-integration period is obtained and recorded as the first The sub-collection value is obtained at the end of the second sub-integration period and the signal amount accumulated by the photosensitive circuit in the second sub-integration period is recorded as the second sub-collection value, at the end of the third sub-integration period Obtain the signal amount accumulated by the photosensitive circuit in the third sub-integration period and record it as the third sub-collection value; according to the first sub-collection value, the second sub-collection value and the third sub-collection value The collected values obtain the first curve.
  • F1 is the first sub-collected value
  • F2 is the The second sub-collection value
  • F3 is the third sub-collection value
  • x1 is the time
  • the duration of the first sub-integration period, the second sub-integration period, and the third sub-integration period are equal.
  • the duration of the first sub-integration period is 10 milliseconds
  • the duration of the second integration period is 60 milliseconds.
  • the duration of the first sub-integration period, the second sub-integration period, and the third sub-integration period are equal, and the first curve satisfies
  • the first exponential function y ka x
  • the texture image acquisition method provided by an embodiment of the present disclosure further includes: resetting the photosensitive circuit in a reset period, wherein the reset period is before the first integration period.
  • the grain image acquisition circuit further includes an integral operation circuit
  • the photosensitive circuit includes a photosensitive element and a switch circuit
  • the switch circuit and the photosensitive element and the The integral operation circuit is electrically connected
  • resetting the photosensitive circuit in the reset period includes: providing a control signal to the switch circuit in the reset period to turn on the switch circuit, so that the The photosensitive element discharges electric charge through the switch circuit and the integral operation circuit.
  • obtaining the first acquisition value based on the signal amount accumulated by the photosensitive circuit in the second integration period includes: at the beginning of the second integration period, The control signal is provided to the switch circuit to turn off the switch circuit, and then at the end of the second integration period, the control signal is provided to the switch circuit to turn on the switch circuit, and use The integration operation circuit performs an integration operation to obtain the first collected value.
  • the grain image acquisition circuit further includes an integral operation circuit
  • the photosensitive circuit includes a photosensitive element and a switch circuit
  • the switch circuit and the photosensitive element and the The integral operation circuit is electrically connected; at the end of the nth sub-integration period, obtaining the signal amount accumulated by the photosensitive circuit in the n-th sub-integration period and recording it as the n-th sub-collection value includes: in the n-th sub-integration period At the beginning of the period, the control signal is provided to the switch circuit to turn off the switch circuit, and then at the end of the nth sub-integration period, the control signal is provided to the switch circuit to make the switch circuit Turn on, and use the integration operation circuit to perform an integration operation to obtain the nth sub-collection value.
  • At least one embodiment of the present disclosure further provides a pattern image acquisition circuit, including a photosensitive circuit and a control circuit, the control circuit is electrically connected to the photosensitive circuit, and the control circuit is configured to: enable the photosensitive circuit to receive data from The first curve is obtained based on the signal amount accumulated by the photosensitive circuit in the first integration period.
  • the first curve is a curve of the residual signal amount with time, and the residual signal amount is the photosensitive circuit.
  • the amount of signal remaining in the circuit before the first integration period is the amount of signal remaining after time is released; the first acquisition value is obtained based on the signal amount accumulated by the photosensitive circuit in the second integration period, and the second integration The period is after the first integration period; and a first photosensitive signal of the image of the texture is obtained based on the first curve and the first acquisition value.
  • control circuit is further configured to: obtain the signal amount released by the residual signal amount in the second integration period based on the first curve and Recorded as a first reference value; and subtracting the first reference value from the first collected value to obtain the first photosensitive signal.
  • control circuit is further configured to: make the first integration period include N sub-integration periods; and obtain the photo-sensitivity at the end of the n-th sub-integration period.
  • the amount of signal accumulated by the circuit in the nth sub-integration period is recorded as the nth sub-collection value; and the first curve is obtained according to the N sub-collection values; N is greater than or equal to 2, and n satisfies 1 ⁇ n ⁇ N.
  • the control circuit is further configured to: make the first integration period include a first sub-integration period, a second sub-integration period, and a third sub-integration period Obtain the signal amount accumulated by the photosensitive circuit in the first sub-integration period at the end of the first sub-integration period and record it as the first sub-collection value, and obtain all the signals at the end of the second sub-integration period The amount of signal accumulated by the photosensitive circuit in the second sub-integration period is recorded as the second sub-collection value, and it is obtained at the end of the third sub-integration period that the photosensitive circuit accumulates in the third sub-integration period The signal amount of is recorded as the third sub-collection value; the first curve is obtained according to the first sub-collection value, the second sub-collection value, and the third sub-collection value.
  • the time when the integration period ends x2 is the time when the second sub-integration period ends, x3 is the time when the third sub-integration period ends, and W1 is the time when the photosensitive circuit is in the first sub-integration period.
  • the signal amount obtained by converting the light of the pattern W2 is the signal amount obtained by converting the light from the pattern in the second sub-integration period by the photosensitive circuit, and W3 is the amount of signal obtained by the photosensitive circuit The signal amount obtained by converting the light from the grain in the third sub-integration period.
  • the texture image acquisition circuit provided by an embodiment of the present disclosure further includes an integral operation circuit
  • the photosensitive circuit includes a photosensitive element and a switch circuit.
  • the switch circuit is electrically connected to the photosensitive element and the integral calculation circuit.
  • the control circuit is electrically connected to the switch circuit; the control circuit is further configured to: at the beginning of the second integration period, provide the control signal to the switch circuit to turn off the switch circuit, and then When the second integration period ends, the control signal is provided to the switch circuit to turn on the switch circuit, and the integration operation circuit is used to perform an integration operation to obtain the first collected value.
  • control circuit is further configured to: at the beginning of the nth sub-integration period, provide the control signal to the switch circuit so that the The switch circuit is turned off, and then at the end of the nth sub-integration period, the control signal is provided to the switch circuit to turn on the switch circuit, and the integration operation circuit is used to perform an integration operation to obtain the first n sub-collected value.
  • At least one embodiment of the present disclosure further provides a display panel, including a display area, the display area includes a pattern recognition area, and a plurality of pixel units arranged in an array are arranged in the display area and are located in the pattern recognition area
  • the pixel unit in includes any texture image acquisition circuit as provided in the embodiments of the present disclosure.
  • Figure 1A is a schematic diagram of texture image acquisition
  • Figure 1B is a schematic diagram of the imaging range of a point light source
  • FIG. 2A is one of the schematic diagrams of a residual image in a texture image
  • 2B is a second schematic diagram of afterimages in a texture image
  • Figure 3 is a curve of the amount of residual signal in a photosensitive element over time.
  • FIG. 4 is a schematic diagram of a texture image acquisition circuit provided by at least one embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram of another pattern image acquisition circuit provided by at least one embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram of a method for acquiring a texture image provided by at least one embodiment of the present disclosure
  • FIG. 7 is a schematic diagram of another grain image acquisition method provided by at least one embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram of still another method for acquiring a texture image according to at least one embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram of still another method for acquiring a texture image according to at least one embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram of still another method for acquiring a texture image according to at least one embodiment of the present disclosure.
  • FIG. 11 is a schematic diagram of another method for acquiring a texture image provided by at least one embodiment of the present disclosure.
  • FIG. 12 is a schematic diagram of a texture image acquisition circuit provided by at least one embodiment of the present disclosure.
  • FIG. 13 is a schematic diagram of another pattern image acquisition circuit provided by at least one embodiment of the present disclosure.
  • FIG. 14 is a circuit diagram of a pattern image acquisition circuit provided by at least one embodiment of the present disclosure.
  • FIG. 15 is a schematic diagram of a display panel provided by at least one embodiment of the present disclosure.
  • FIG. 16 is a circuit diagram of a plurality of pattern image acquisition circuits in a display panel provided by at least one embodiment of the present disclosure.
  • FIG. 17 is a circuit diagram of a plurality of pattern image acquisition circuits in another display panel provided by at least one embodiment of the present disclosure.
  • One of the means to achieve a narrow frame is to integrate a photosensitive element (photosensitive circuit) with a texture image acquisition function into the display panel, thereby realizing under-screen texture recognition, increasing the area of the display area of the display panel, and increasing the screen-to-body ratio.
  • a photosensitive element photosensitive circuit
  • a point light source, a line light source, or a light source with a certain pattern can be used as the photosensitive light source of the photosensitive element to obtain the pattern image and further pattern recognition.
  • a point light source is taken as an example of a photosensitive light source of a photosensitive element to introduce the principle of obtaining a pattern image, but this does not limit the embodiments of the present disclosure.
  • a reflective optical texture pattern acquisition device in the process of texture image acquisition, as shown in FIG. 1A, when the point light source L1 emits light, the light irradiates the texture pressing interface (such as the outer surface of the glass screen) at different angles.
  • the texture pressing interface such as the outer surface of the glass screen
  • the part of these lights whose incident angle is greater than or equal to the critical angle ⁇ of total reflection will be totally reflected, causing this part of the light to fail to exit from the texture pressing interface, resulting in a total reflection area .
  • the part of these lights whose incident angle is smaller than the critical angle ⁇ of total reflection exits from the texture pressing interface. Therefore, the texture image can be collected by the light reflected by the total reflection area.
  • a clear texture image is formed at B1 of the texture imaging interface.
  • the texture image corresponds to the part of the texture located at F1.
  • F1 is the total reflection area.
  • B1 is the imaging area.
  • the ridge of the fingerprint touches the surface of the total reflection area F1, so the total reflection condition of the position corresponding to the ridge of the fingerprint is destroyed, so the light will be there.
  • the corresponding position is emitted, so that the original reflection path is changed, and the valley of the fingerprint will not touch the surface of the total reflection area F1. Therefore, the total reflection condition of the position corresponding to the valley of the fingerprint is not destroyed.
  • the light at the position is still totally reflected, so that the original reflection path is not changed. In this way, the light in the total reflection area has different effects on the total reflection conditions caused by the valleys and ridges of the fingerprint, so that the light incident on the texture imaging interface forms a bright and dark texture image at different positions.
  • the A1 of the pattern imaging interface becomes the detection Invalid area, this area cannot form a valid texture image.
  • the ineffective area A1 the light emitted by the light source L1 is reflected by other functional layers to the texture imaging interface before reaching the texture pressing interface, and the part that is almost vertically reflected by the texture pressing interface has high brightness, which is basically located in the ineffective area A1.
  • a high-brightness area is formed. The high-brightness area generates relatively large photoelectric signals in the corresponding part of the photosensitive element array due to the high light intensity, which is easy to form afterimages, which can also be called afterimages.
  • FIG. 1B shows a schematic diagram of the imaging range of a point light source.
  • the effective imaging range is annular, that is, in FIG. 1B, the annular area between the inner circle 61 and the outer circle 62 is the effective imaging range, corresponding to that in FIG. 1A
  • the imaging area B1 corresponding to the total reflection area F1; the area within the inner circle 61 of the ring (hereinafter referred to as the ring center 60) is an invalid imaging area, which corresponds to the invalid area A1 in FIG. 1A; a partial area inside the ring center 60
  • the (shaded area) 63 is a highlight area (afterimage area), which is likely to cause an afterimage in the photosensitive element array during the imaging process.
  • the effective imaging range formed by one light source is limited, so multiple side-by-side light sources (such as multiple light sources arranged in an array) can be provided at the same time, and the effective imaging range of each light source can be combined to form a larger Effective imaging range.
  • multiple side-by-side light sources such as multiple light sources arranged in an array
  • the effective imaging range of each light source can be combined to form a larger Effective imaging range.
  • multiple light sources or multiple light source arrays can be illuminated in a time-sharing manner to form multiple effective imaging ranges, and the effective imaging range of one light source array covers the ineffective area of another light source array, thereby making these differences
  • the effective imaging range of the light source array is superimposed and spliced, so that a larger texture image can be obtained.
  • multiple light sources or light source arrays
  • the highlight area formed by one light source is important for the photosensitive element. The influence of the corresponding part of the array will not disappear quickly, but will partially remain in the corresponding part of the photosensitive element array.
  • the interval between the light source arrays starting to light up twice is called a frame
  • the texture image obtained by lighting the light source array once is called an image frame.
  • the light source arrays corresponding to two adjacent frames are adjacent (for example, the light sources constituting the two arrays are staggered with each other by a predetermined interval in a predetermined direction (for example, horizontal or vertical)).
  • Light source array In the process of acquiring the texture image, it is also possible to light up all the light source arrays at the same time in each frame, and then process the obtained multiple graphics frames to obtain the final texture image.
  • photosensitive elements usually use photosensitive materials to photoelectrically convert the received light to generate carrier charges, and then, for example, perform analog-to-digital conversion (analog-digital conversion). Conversion) to get the signal amount corresponding to the pattern.
  • photosensitive materials such as amorphous silicon, gallium arsenide and other semiconductor materials
  • the charges generated after photoelectric conversion may not be completely extracted from the photosensitive element in a short time.
  • the residual charge in the previous frame of the photosensitive element will be superimposed with the charge of the current frame, resulting in lag, which in turn leads to unclear texture images and ultimately affects the texture.
  • the validity and accuracy of recognition is amorphous silicon, gallium arsenide and other semiconductor materials.
  • FIG. 2A and FIG. 2B show schematic diagrams of the afterimage phenomenon that occurs in a method of image stitching.
  • Figure 2A shows the texture image obtained at the first moment.
  • Figure 2B shows the texture image obtained at the second moment, and the second moment is later than the first moment.
  • LA1 in Figures 2A and 2B represents the residual image caused by the residual charge in the previous frame caused by the light source array with the relative position in the upper left corner being lit
  • LA2 represents the image formed by the light source array being normally lit in the current frame Highlights.
  • the afterimage LA1 in FIG. 2B is weaker than the afterimage LA1 in FIG. 2A. As shown in Figure 2A and Figure 2B, the afterimage phenomenon will gradually decrease over time.
  • FIG. 3 shows a curve C1 of the residual signal amount in a photosensitive element over time.
  • the residual charge in the photosensitive element cannot be directly obtained, so it is necessary to convert the residual charge into other parameters such as voltage value through a certain circuit to obtain the corresponding residual signal.
  • the pattern image acquisition method, pattern image acquisition circuit, and display panel provided by at least one embodiment of the present disclosure obtain the residual charge release amount within a certain integration period according to the change rule when the above-mentioned residual image phenomenon weakens, and then obtain the corresponding pattern image
  • the photosensitive signal can improve the effectiveness and accuracy of texture image acquisition.
  • At least one embodiment of the present disclosure provides a method for acquiring a texture image.
  • the method for acquiring a texture image may be used in a texture image acquiring circuit.
  • FIG. 4 shows an exemplary texture image acquiring circuit 10.
  • the circuit 10 includes a photosensitive circuit 100.
  • the operation steps included in the grain image acquisition method will be described below in conjunction with FIG. 4, FIG. 6 and FIG. 7.
  • the grain image acquisition method includes the following steps.
  • Step S100 Make the photosensitive circuit 100 receive the light from the pattern, and obtain a first curve C1 based on the signal amount accumulated by the photosensitive circuit 100 in the first integration period IP1, the first curve C1 is a curve of the residual signal amount over time, The residual signal amount is the residual signal amount of the light-sensing circuit 100 before the first integration period IP1 after being released over time.
  • Step S200 Obtain the first collection value based on the signal amount accumulated by the photosensitive circuit 100 in the second integration period IP2, the second integration period being after the first integration period.
  • Step S300 Obtain a first photosensitive signal of the image of the texture based on the first curve C1 and the first collected value.
  • the second integration period IP2 is after the first integration period IP1.
  • the second integration period IP2 and the first integration period IP1 are continuous in time sequence, that is, there is no gap between the second integration period IP2 and the first integration period IP1.
  • the second integration period IP2 and the first integration period IP1 are not continuous in time sequence, that is, there is a gap between the second integration period IP2 and the first integration period IP1.
  • the above-mentioned texture image acquisition circuit 10 further includes an integration operation circuit 200.
  • the integration operation circuit 200 is configured to perform an integration operation on the amount of charge accumulated by the photosensitive circuit 100, and convert the analog charge amount into a digital one. The signal amount, thereby obtaining the signal amount corresponding to the amount of charge accumulated by the photosensitive circuit 100.
  • the amount of charge accumulated by the photosensitive circuit 100 can be released to the integral operation circuit 200.
  • the released amount of charge includes two parts, one part is the amount of charge remaining in the previous frame. , The other part is the release amount corresponding to the amount of charge obtained after converting the received light in the current frame.
  • the remaining signal amount of the photosensitive circuit 100 before the first integration period IP1 over time is called the residual signal amount
  • the first curve C1 is The residual signal amount changes with time.
  • a control signal GT can be provided to the photosensitive circuit 100 during a certain period A to make the photosensitive circuit 100 and the integral operation circuit 200 non-conducting. In this period A, the residual charge in the photosensitive circuit 100 will be released over time. The photosensitive circuit 100 also converts the received light into electric charges. Then, the control signal GT can be provided to the photosensitive circuit 100 to make the photosensitive circuit 100 and the integral operation circuit 200 conduct, so that the photosensitive circuit 100 can release the charge accumulated in the A period to the integral operation circuit 200, and the integral operation circuit 200 can receive The obtained charge quantity is integrated to obtain the corresponding signal quantity.
  • the signal quantity can be obtained from the data output terminal DT of the integration operation circuit 200.
  • the integration operation circuit 200 is further configured to receive the reference voltage Vref to perform the integration operation. .
  • step S100 since the amount of residual charge released in the first integration period IP1 varies with time, the first curve C1 can be obtained according to the amount of residual signal.
  • the first curve C1 is only related to the residual signal amount, and has nothing to do with the signal amount obtained by converting the received light by the photosensitive circuit 100.
  • the obtained first collection value includes two parts, one is the signal amount released by the residual signal amount in the second integration period IP2, and the other is the signal amount obtained after the photoreceptor circuit 100 converts the received light. .
  • a first photosensitive signal of the image of the texture can be obtained based on the first curve C1 and the first collected value. For example, based on the first curve C1, the portion of the first collected value related to the amount of residual signal can be removed, so that the obtained first photosensitive signal is only related to the light from the pattern received by the photosensitive circuit 100, and not the residual signal.
  • the amount is related.
  • a processing circuit may be used to further process the first photosensitive signal to obtain a pattern image, thereby completing pattern recognition.
  • Using the grain image acquisition method provided by the embodiment of the present disclosure can make the first photosensitive signal finally obtained only related to the light from the grain received by the photosensitive circuit 100, and has nothing to do with the residual signal amount of the photosensitive circuit 100, thereby improving the final The effectiveness and accuracy of pattern recognition.
  • the above step S300 includes the following operation steps.
  • Step S310 Obtain the signal amount released by the residual signal amount in the second integration period IP2 based on the first curve C1 and record it as the first reference value.
  • step S320 subtract the first reference value from the first collected value to obtain the first photosensitive signal.
  • the value of the residual signal amount corresponding to the photosensitive circuit 100 at any time can be obtained, and then in step S310, the residual signal amount can be obtained based on the first curve C1 within the second integration period IP2.
  • the released semaphore is the first reference value.
  • the value of the residual signal corresponding to the beginning of the second integration period IP2 can be obtained based on the first curve C1
  • the value of the residual signal corresponding to the end of the second integration period IP2 can be obtained based on the first curve C1
  • the second The value of the residual signal amount corresponding to the beginning of the integration period IP2 is subtracted from the value of the residual signal amount corresponding to the end of the second integration period IP2 to obtain the first reference value.
  • the first collected value is subtracted from the first reference value to obtain the first photosensitive signal.
  • the second integral is not required
  • the period IP2 and the first integral period IP1 are continuous. As shown in FIG. 7, the second integral period IP2 and the first integral period IP1 may also be discontinuous, that is, there is a gap between the second integral period IP2 and the first integral period IP1.
  • an example of the above step S100 includes the following operation steps.
  • Step S110 Make the first integration period IP1 include N sub-integration periods.
  • Step S120 At the end of the n-th sub-integration period, the signal amount accumulated by the photosensitive circuit 100 in the n-th sub-integration period is obtained and recorded as the n-th sub-collection value.
  • step S130 obtaining the first curve C1 according to the N sub-collection values.
  • N is greater than or equal to 2, and n satisfies 1 ⁇ n ⁇ N.
  • Step S111 Make the first integration period IP1 include the first sub-integration period SIP1, the second sub-integration period SIP2, and the third sub-integration period SIP3.
  • the second sub-integration period SIP2 and the first sub-integration period SIP1 are continuous
  • the third sub-integration period SIP3 and the second sub-integration period SIP2 are continuous.
  • Step S121 Obtain the signal amount accumulated by the photosensitive circuit 100 in the first sub-integration period SIP1 at the end of the first sub-integration period SIP1 and record it as the first sub-collection value F1, and obtain the photosensitive circuit at the end of the second sub-integration period SIP2 100
  • the signal amount accumulated in the second sub-integration period SIP2 is recorded as the second sub-collection value F2.
  • the signal amount accumulated by the photosensitive circuit 100 in the third sub-integration period SIP3 is obtained and recorded Make the third sub-collection value F3.
  • step S131 Obtain the first curve C1 according to the first sub-collection value F1, the second sub-collection value F2, and the third sub-collection value F3.
  • the above step S131 may include the following operation steps.
  • step S1314 Obtain the first exponential function according to the first equation, the second equation and the third equation.
  • F1 is the first sub-collection value
  • F2 is the second sub-collection value
  • F3 is the third sub-collection value
  • x1 is the time when the first sub-integration period SIP1 ends
  • x2 is the end of the second sub-integration period SIP2
  • X3 is the time when the third sub-integration period SIP3 ends
  • W1 is the signal quantity obtained by the photosensitive circuit 100 converting the light from the pattern in the first sub-integration period SIP1
  • W2 is the signal quantity obtained by the photosensitive circuit 100 in the second sub-integration period SIP1.
  • the signal amount obtained by converting the light from the pattern in the integration period SIP2, and W3 is the signal amount obtained by the photosensitive circuit 100 converting the light from the pattern in the third sub-integration period SIP3.
  • step S111 A specific example of the above step S111, step S121, and step S131 will be described below with reference to FIG. 3, FIG. 4, and FIG. 9.
  • the duration of the first sub-integration period SIP1, the second sub-integration period SIP2, and the third sub-integration period SIP3 are equal.
  • the duration of the first sub-integration period SIP1 is 10 milliseconds (ms).
  • the pulse width of the control signal GT (that is, the time at a high level) is, for example, on the order of microseconds ( ⁇ s), so it is relative to the duration of the first sub-integration period SIP1 In other words, the pulse width of the control signal GT can be ignored.
  • the pulse width of the control signal GT can also be ignored and will not be repeated.
  • the second sub-integration period SIP2 is entered, and a low-level control signal GT is provided to the photosensitive circuit 100, so that the photosensitive circuit 100 and the integral operation circuit 200 are not conducted; then in the second sub-integration period
  • the third sub-integration period SIP3 is entered, and a low-level control signal GT is provided to the photosensitive circuit 100, so that the photosensitive circuit 100 and the integral operation circuit 200 are not conducted; then in the third sub-integration period
  • the duration of the second integration period IP2 is 60 ms
  • the first reference value can be obtained according to the first curve C1 and the start time and end time of the second integration period IP2 , And then subtract the first reference value from the first collected value to obtain the first photosensitive signal of the image of the texture.
  • W1 (W2 or W3) can also be obtained after solving the first equation set above, that is, the photosensitive circuit 100 is in the first sub-integration period SIP1 (the second sub-integration period SIP2 or the third sub-integration period SIP3)
  • SIP1 the second sub-integration period SIP2 or the third sub-integration period SIP3
  • the signal quantity obtained by converting the light from the grain, and then data processing on the signal quantity can also obtain the grain image.
  • the value of W1 may be smaller, which is not conducive to subsequent data processing.
  • the texture image acquisition method sets the second integration period IP2. Since the amount of residual signal of the photosensitive circuit 100 in the second integration period IP2 is already small, that is, the first reference value is small, so finally the obtained first photosensitive signal includes a larger amount of signal related to the texture image, which is more conducive to subsequent data processing to obtain a more effective and accurate texture image.
  • setting the duration of the first sub-integration period SIP1 to 10 milliseconds (ms) and setting the duration of the second sub-integration period IP2 to 60 ms are merely exemplary.
  • the embodiments of the present disclosure include but are not limited to this. According to actual needs, the duration of the first sub-integration period SIP1 and the second sub-period IP2 may also select other suitable values.
  • the above step S131 includes the following operation steps.
  • step S1317 Obtain the first exponential function according to the fourth equation and the fifth equation.
  • F1 is the first sub-collection value
  • F2 is the second sub-collection value
  • F3 is the third sub-collection value
  • x1 is the time when the first sub-integration period ends
  • x2 is the time when the second sub-integration period ends
  • X3 is the time when the third sub-integration period ends.
  • step S111 A specific example of the above step S111, step S121, and step S131 will be described below with reference to FIG. 3, FIG. 4, and FIG. 9.
  • the duration of the first sub-integration period SIP1, the second sub-integration period SIP2, and the third sub-integration period SIP3 are equal.
  • the duration of the first sub-integration period SIP1 is 10 milliseconds (ms).
  • the circuit 100 provides a high-level control signal GT, so that the photosensitive circuit 100 and the integral operation circuit 200 are turned on, so that the first sub-collection value F1 can be obtained at the data output terminal DT.
  • the second sub-integration period SIP2 is entered, and a low-level control signal GT is provided to the photosensitive circuit 100, so that the photosensitive circuit 100 and the integral operation circuit 200 are not conducted; then in the second sub-integration period
  • a high-level control signal GT is provided to the photosensitive circuit 100, so that the photosensitive circuit 100 and the integral operation circuit 200 are turned on, so that the second sub-collection value F2 can be obtained at the data output terminal DT.
  • the third sub-integration period SIP3 is entered, and a low-level control signal GT is provided to the photosensitive circuit 100, so that the photosensitive circuit 100 and the integral operation circuit 200 are not conducted; then in the third sub-integration period
  • a high-level control signal GT is provided to the photosensitive circuit 100, so that the photosensitive circuit 100 and the integral operation circuit 200 are turned on, so that the third sub-collection value F3 can be obtained at the data output terminal DT.
  • the fourth equation and the fifth equation are combined into a second equation group.
  • the second equation group has two equations and two unknowns. By solving the second equation group, k and a can be obtained, thereby finally obtaining the first curve C1.
  • the first integration period IP1 includes three sub-integration periods as an example.
  • the embodiments of the present disclosure include but are not limited to this.
  • the first curve C1 It may also be a linear curve with respect to time change. At this time, it is only necessary to make the first integration period IP1 include two sub-integration periods, which will not be repeated here.
  • the texture image acquisition method further includes the following operation steps.
  • Step S400 Reset the photosensitive circuit 100 in the reset period RP, the reset period RP is before the first integration period IP1.
  • a high-level control signal GT is provided to the photosensitive circuit 100, so that the photosensitive circuit 100 and the integral operation circuit 200 are conducted, and the photosensitive circuit 100 can pass through the integral operation circuit 200.
  • the charge is released, but it should be noted that after the reset period RP, the remaining charge of the previous frame in the photosensitive circuit 100 cannot be discharged.
  • the photosensitive circuit 100 includes a photosensitive element 110 and a switch circuit 120, and the switch circuit 120 is electrically connected to the photosensitive element 110 and the integral operation circuit 200.
  • the above step S400 includes the following operation steps.
  • Step S410 Provide a control signal GT to the switch circuit 120 during the reset period RP to turn on the switch circuit 120, so that the photosensitive element 110 discharges charges through the switch circuit 120 and the integral operation circuit 200.
  • the photosensitive circuit 100 includes a photosensitive element 110 and a switch circuit 120, and the switch circuit 120 is electrically connected to the photosensitive element 110 and the integral operation circuit 200.
  • the above step S200 includes the following operation steps.
  • Step S210 At the beginning of the second integration period IP2, provide the control signal GT to the switch circuit 120 to turn off the switch circuit 120, and then at the end of the second integration period IP2, provide the control signal GT to the switch circuit 120 to make the switch circuit 120 It is turned on, and the integration operation circuit 200 is used to perform an integration operation to obtain the first collected value.
  • the photosensitive circuit 100 includes a photosensitive element 110 and a switch circuit 120, and the switch circuit 120 is electrically connected to the photosensitive element 110 and the integral operation circuit 200.
  • the above step S120 includes the following operation steps.
  • Step S1201 At the beginning of the nth sub-integration period, provide the control signal GT to the switch circuit 120 to turn off the switch circuit 120, and then at the end of the nth sub-integration period, provide the control signal GT to the switch circuit 120 to make the switch circuit 120 Turn on, and use the integration operation circuit 200 to perform an integration operation to obtain the nth sub-collection value.
  • the first photosensitive signal finally obtained is only related to the light from the grain received by the photosensitive circuit 100 (that is, the amount of signal related to the grain image), and is related to the photosensitive circuit 100.
  • the residual signal amount is irrelevant, which can improve the effectiveness and accuracy of the final pattern recognition.
  • the pattern image acquisition circuit 10 includes a photosensitive circuit 100 and a control circuit 300.
  • the control circuit 300 and the photosensitive circuit 100 are electrically connected, and the control circuit 300 is configured to control to perform the following operations.
  • the control circuit 300 operates so that the photosensitive circuit 100 receives the light from the pattern, and obtains a first curve C1 based on the signal amount accumulated by the photosensitive circuit 100 in the first integration period IP1.
  • the first curve C1 is the residual signal amount over time.
  • the change curve, the residual signal quantity is the residual signal quantity of the photosensitive circuit 100 before the first integration period IP1 and the remaining signal quantity after the time is released; the first is obtained based on the signal quantity accumulated by the photosensitive circuit 100 in the second integration period IP2 Acquisition value, the second integration period IP2 is after the first integration period IP1; and based on the first curve C1 and the first acquisition value, the first photosensitive signal of the image of the texture is obtained. That is, the control circuit 300 is configured to control the execution of the above-mentioned operation steps S100, S200, and S300.
  • control circuit 300 may also be electrically connected to the data output terminal DT, so that the control circuit 300 can receive the first collected value.
  • the texture image acquisition circuit 10 provided by some embodiments of the present disclosure further includes an integration operation circuit 200, which is configured to perform an integration operation on the amount of charge accumulated by the photosensitive circuit 100 to convert the simulated charge The quantity is converted into a digital signal quantity, thereby obtaining the signal quantity corresponding to the charge quantity accumulated by the photosensitive circuit 100.
  • the signal quantity can be obtained from the data output terminal DT of the integration operation circuit 200.
  • the integration operation circuit 200 is also configured to receive the reference voltage Vref to perform the integration operation.
  • control circuit 300 is also configured to control the following operations.
  • control circuit 300 is configured to control the execution of the above-mentioned operation steps S310 and S320.
  • control circuit 300 is also configured to control the following operations.
  • the control circuit 300 operates such that the first integration period IP1 includes N sub-integration periods; at the end of the n-th sub-integration period, the signal amount accumulated by the photosensitive circuit 100 in the n-th sub-integration period is obtained and recorded as the n-th sub-collection value; And the first curve is obtained according to the N sub-collection values; N is greater than or equal to 2, and n satisfies 1 ⁇ n ⁇ N. That is, the control circuit 300 is configured to control the execution of the above operation steps S110, S120, and S130.
  • control circuit 300 is also configured to control the following operations.
  • the control circuit 300 operates so that the first integration period IP1 includes a first sub-integration period SIP1, a second sub-integration period SIP2, and a third sub-integration period SIP3; at the end of the first sub-integration period SIP1, the photosensitive circuit 100 is in the first The signal amount accumulated in the sub-integration period SIP1 is recorded as the first sub-collection value F1. At the end of the second sub-integration period SIP2, the signal amount accumulated by the photosensitive circuit 100 in the second sub-integration period SIP2 is obtained and recorded as the second sub-period.
  • the collected value F2 is obtained at the end of the third sub-integration period SIP3 and the signal amount accumulated by the photosensitive circuit 100 in the third sub-integration period SIP3 is recorded as the third sub-collection value F3; and according to the first sub-collection value F1, the second The sub-collection value F2 and the third sub-collection value F3 obtain the first curve C1. That is, the control circuit 300 is configured to control the execution of the above-mentioned operation steps S111, S121, and S131.
  • the control circuit 300 is further configured to control to perform the following operations.
  • F1 is the first sub-collection value
  • F2 is the second sub-collection value
  • F3 is the third sub-collection value
  • x1 is the moment when the first sub-integration period SIP1 ends
  • x2 is the moment when the second sub-integration period SIP2 ends
  • x3 is When the third sub-integration period SIP3 ends
  • W1 is the signal amount obtained by the light-sensing circuit 100 converting the light from the pattern in the first sub-integration period SIP1
  • W2 is the photo-sensing circuit 100's signal amount
  • W3 is the signal quantity obtained by the photosensitive circuit 100 converting the light from the grain in the third sub-integration period SIP3. That is, the control circuit 300 is configured to control the execution of the above-mentioned operation steps S1311, S1312, S1313, and S1314.
  • steps S1311, S1312, S1313, and S1314 reference may be made to the corresponding description in the above-mentioned method for acquiring the texture image, which will not be repeated here.
  • the control circuit 300 is further configured to control to perform the following operations.
  • the photosensitive circuit 100 includes a photosensitive element 110 and a switch circuit 120.
  • the switch circuit 120 is electrically connected to the photosensitive element 110 and the integral operation circuit 200 to control
  • the circuit 300 and the switch circuit 120 are electrically connected.
  • the control circuit 300 is also configured to control to perform the following operations.
  • the control signal GT is provided to the switch circuit 120 to turn off the switch circuit 120, and then at the end of the second integration period IP2, the control signal GT is provided to the switch circuit 120 to turn on the switch circuit 120,
  • the integration operation circuit 200 is used to perform an integration operation to obtain the first collected value. That is, the control circuit 300 is configured to control the execution of the above-mentioned operation step S210.
  • step S210 reference may be made to the corresponding description in the above-mentioned method for acquiring the texture image, which will not be repeated here.
  • control circuit 300 is also configured to control the following operations.
  • the control circuit 300 operates to provide a control signal GT to the switch circuit 120 at the beginning of the nth sub-integration period to turn off the switch circuit 120, and then at the end of the nth sub-integration period, to provide the control signal GT to the switch circuit 120 to make
  • the switch circuit 120 is turned on, and the integration operation circuit 200 is used to perform an integration operation to obtain the nth sub-collection value. That is, the control circuit 300 is configured to control the execution of the above-mentioned operation step S1201.
  • step S1201 reference may be made to the corresponding description in the above-mentioned method for acquiring the texture image, which will not be repeated here.
  • control circuit 300 is also configured to control the following operations.
  • the control circuit 300 operates to provide a control signal GT to the switch circuit 120 during the reset period RP to turn the switch circuit 120 on, so that the photosensitive element 110 discharges charges through the switch circuit 120 and the integral operation circuit 200. That is, the control circuit 300 is configured to control the execution of the above-mentioned operation step S410.
  • step S410 reference may be made to the corresponding description in the above-mentioned method for acquiring the texture image, which is not repeated here.
  • the texture image acquisition circuit 10 provided by some embodiments of the present disclosure may be implemented as the circuit structure shown in FIG. 14. It should be noted that the control circuit 300 is not shown in FIG. 14.
  • the photosensitive element 110 may be a PIN diode.
  • the embodiments of the present disclosure include but are not limited to this.
  • the photosensitive element 110 may also use other types of photosensitive diodes (such as PN diodes or OPD diodes).
  • PN diodes or OPD diodes.
  • the photosensitive element 110 may, for example, only sense light of a certain wavelength (for example, red light or green light), or may sense all visible light.
  • the switch circuit 120 may adopt a transistor T, for example, the transistor T is an N-type transistor.
  • the integration operation circuit 200 may be implemented to include an operational amplifier D and a storage capacitor C.
  • the first electrode (for example, the anode) of the PIN diode is configured to receive the first voltage Vd
  • the second electrode for example, the cathode
  • the gate of the transistor T Is configured to receive the control signal GT
  • the second pole of the transistor T is connected to the inverting input terminal of the operational amplifier D
  • the non-inverting input terminal of the operational amplifier D is configured to receive the reference voltage Vref
  • the inverting input terminal of D is connected
  • the second pole of the storage capacitor C is connected to the output terminal of the operational amplifier D
  • the output terminal of the operational amplifier D serves as the data output terminal DT.
  • the voltage applied across the PIN diode needs to be a reverse voltage, that is, the reference voltage Vref needs to be greater than the first voltage Vd.
  • the reference voltage Vref is 1V and the first voltage Vd is -2V; or the reference voltage Vref is 1.25V and the first voltage Vd is -4V.
  • the transistors used in the embodiments of the present disclosure may be thin film transistors, field effect transistors, or other switching devices with the same characteristics.
  • the source and drain of the transistor used here can be symmetrical in structure, so the source and drain can be structurally indistinguishable.
  • one pole is directly described as the first pole and the other pole is the second pole. Therefore, in the embodiments of the present disclosure, all or part of the transistors have the first pole.
  • the pole and the second pole are interchangeable as needed.
  • the first electrode of the transistor may be a source and the second electrode may be a drain; or, the first electrode of the transistor may be a drain and the second electrode may be a source.
  • transistors can be divided into N-type and P-type transistors according to their characteristics.
  • the turn-on voltage is a low-level voltage (for example, 0V, -5V, -10V or other suitable voltages)
  • the turn-off voltage is a high-level voltage (for example, 5V, 10V or other suitable voltages) );
  • the turn-on voltage is a high-level voltage (for example, 5V, 10V or other suitable voltages)
  • the turn-off voltage is a low-level voltage (for example, 0V, -5V, -10V or other suitable Voltage).
  • the transistor in the embodiment of the present disclosure is described by taking an N-type transistor as an example. Based on the description and teaching of the implementation in the present disclosure, those of ordinary skill in the art can easily imagine that the embodiments of the present disclosure may also use P-type transistors without creative work.
  • a high-level control signal GT is provided to the gate of the transistor T so that the transistor T is turned on, so that the PIN-type diode discharges charges through the transistor T and the operational amplifier D.
  • the PIN diode can receive The light is converted into electric charge, on the other hand, the residual electric charge in the PIN diode will be released.
  • a high-level control signal GT is provided to the gate of the transistor T so that the transistor T is turned on, and the charge accumulated by the PIN diode in the first sub-integration period SIP1 passes through the transistor T is transmitted to the inverting input terminal of the operational amplifier D, and after the integration operation of the operational amplifier D and the storage capacitor C, the first sub-collection value F1 is obtained at the data output terminal DT.
  • the working principle of the texture image acquisition circuit 10 in the second sub-integration period SIP2, the third sub-integration period SIP3, and the second sub-integration period IP2 can refer to the description in the first sub-integration period SIP1, which will not be repeated here.
  • the second sub-integration period SIP2, the third sub-integration period SIP3, and the second sub-integration period IP2 the second sub-collection value F2, the third sub-collection value F3, and the first collection value can be obtained respectively.
  • the control circuit 300 may also be configured to be electrically connected to the data output terminal DT, so that the first sub-collected value F1, the second sub-collected value F2, and the third sub-collected value F1 can be received from the data output terminal DT.
  • the sub-collection value F3 and the first collection value, and then the control circuit 300 can obtain the first curve C1 according to the first sub-collection value F1, the second sub-collection value F2, and the third sub-collection value F3, and then according to the first curve C1 Obtain the first reference value, and finally subtract the first reference value from the first collected value to obtain the first photosensitive signal.
  • control circuit 300 may transmit the first light-sensing signal to the processing circuit at the back end for further data processing, so as to obtain a pattern image according to the first light-sensing signal.
  • control circuit 300 can also be directly used to process the first photosensitive signal.
  • the first sub-collection value F1, the second sub-collection value F2, the third sub-collection value F3, the first collection value, and the first reference value may be, for example, voltage values.
  • the disclosed embodiments include but are not limited to this.
  • the display panel 1 includes a display area 210, and the display area 210 includes a pattern recognition area 211.
  • the pattern recognition area 211 is the area where the operating body performs pattern recognition on the display panel 1.
  • the size of the pattern recognition area 211 shown in FIG. 15 is only illustrative, for example, the pattern The size of the recognition area 211 can be the same as the size of the display area 210, that is, the operating body can perform pattern recognition at any position of the display area 210 of the display panel 1.
  • the operating body with lines may be a hand.
  • the lines in the method for acquiring a line image are skin lines, such as fingerprints, palm prints, etc.; in addition, the operating body with lines may also be It is a non-biological body with a certain texture, for example, an object with a certain texture made of materials such as resin, which is not specifically limited in the embodiments of the present disclosure.
  • a plurality of pixel unit arrays arranged in an array are provided in the display area 210, and the pixel unit array includes a plurality of pixel units.
  • the pixel unit located in the pattern recognition area 211 is marked as PU2
  • the pixel unit located in the display area 210 but not in the pattern recognition area 211 is marked as PU1, which is located in the pattern recognition area 211
  • the pixel unit PU2 includes any texture image acquisition circuit 10 provided by the embodiment of the present disclosure.
  • the texture image acquisition circuit 10 can be directly formed on the display substrate of the display panel 1 using a thin film process.
  • each pixel unit (including the pixel unit PU1 and the pixel unit PU2) includes a thin film transistor and a light emitting device.
  • the light emitting device includes, for example, an anode, a cathode, and a light emitting layer between the anode and the cathode.
  • the pixel unit array of the display panel 1 is used to be implemented as a light source array, and multiple pixel units are implemented to form multiple light sources. That is, the pixel units of the display panel 1 are multiplexed as light-sensitive light sources, so the compactness of the display panel can be improved, and the difficulty of arranging various functional structures can be reduced.
  • each light-sensitive light source includes one or more pixel units, so that the light-sensitive light source can be formed into a point light source, a linear light source, a zigzag light source or a back-shaped light source with a certain shape through different arrangements of one or more pixel units. Wait.
  • the pixel units in the entire display area 210 of the display panel 1 can be controlled to be multiplexed as light-sensitive light sources, and the pattern image acquisition circuit 10 can also be arranged in each pixel unit accordingly, thereby realizing full-screen pattern recognition .
  • the display panel 1 further includes a peripheral area 220 surrounding the display area 210.
  • the control circuit 300 in the texture image acquisition circuit 10 may be disposed in the peripheral area 220.
  • Fig. 16 shows an example in which the texture image acquisition circuit 10 is provided (only one column of pixel units PU2 is shown).
  • the pattern image acquisition circuit 10 in the pixel unit PU2 in the first row includes a PIN diode PIN(1), a transistor T(1), an operational amplifier D(1) and a storage capacitor C(1), and The data output terminal DT(1) outputs each collected value.
  • the numbers in parentheses in each label in the figure indicate the corresponding number of rows, and the following embodiments are the same, and will not be repeated.
  • each texture image acquisition circuit 10 is separately provided with an operational amplifier and a storage capacitor, which can reduce the mutual influence between the texture image acquisition circuits 10 in adjacent rows of pixel units.
  • multiple pattern image acquisition circuits 10 can also share the same integration operation circuit 200 (operational amplifier D and storage capacitor C), which can reduce the need to set The area occupied by multiple texture image acquisition circuits 10.
  • FIG. 11 shows a signal timing diagram for the multiple texture image acquisition circuits shown in FIG. 17. As shown in FIG. 11, since the texture image acquisition circuits in the pixel units in the same column and different rows share the same Integral arithmetic circuit 200, so the control signals (GT(1), GT(2), GT(3),..., GT(n)) of the texture image acquisition circuit in pixel units of different rows are sequentially provided in sequence .
  • the display panel 1 further includes a processing circuit 400, which is electrically connected to the pixel unit PU2 in the pattern recognition area 211, for example, and the control circuit 300 in the pattern image acquisition circuit 10 in the pixel unit PU2. Electrically connected, the processing circuit 400 is configured to process a plurality of first photosensitive signals obtained by a plurality of texture image acquisition circuits 10 to obtain a texture image.
  • the processing circuit 400 may be implemented by a general-purpose processor or a special-purpose processor, which is not limited in the embodiment of the present disclosure.
  • the texture image acquisition circuit 10 is directly formed on the display substrate of the display panel 1 and integrated in the pixel unit PU2.
  • the pixel unit PU2 can be multiplexed into the texture image acquisition circuit 10 Photosensitive light source.
  • the embodiments of the present disclosure include but are not limited to this.
  • the pattern image acquisition circuit 10 may also be provided separately, for example, the pattern image acquisition circuit 10 is attached to the back of the display substrate of the display panel 1. In this case, a separate A light-emitting element as a light-sensitive light source of the grain image acquisition circuit 10 is provided.
  • the display panel 1 is an Organic Light Emitting Diode (OLED) display panel or a Quantum Dot Light Emitting Diode (QLED) display panel, etc.
  • OLED Organic Light Emitting Diode
  • QLED Quantum Dot Light Emitting Diode
  • the embodiments of the present disclosure do not specifically limit this.
  • the OLED display panel may be a flexible OLED display panel, for example.
  • the OLED display panel has self-luminous characteristics, and the light emission of its pixel units can also be controlled or modulated as required, which can facilitate the acquisition of texture images and help improve integration.
  • the pattern image acquisition circuit 10 in the pixel unit PU2 in the pattern recognition area 211 can receive light from the pattern, such as light reflected by the pattern.
  • adopting the method for acquiring the pattern image provided by the embodiments of the present disclosure can make the first photosensitive signal finally obtained only related to the light from the pattern received by the photosensitive circuit 100, and has nothing to do with the residual signal amount of the photosensitive circuit 100, so that Improve the effectiveness and accuracy of pattern recognition.
  • At least one embodiment of the present disclosure also provides a display device.
  • the display device includes any display panel 1 provided in the embodiments of the present disclosure.
  • the display device in this embodiment may be: a liquid crystal panel, a liquid crystal television, a display, an OLED Panels, OLED TVs, electronic paper, mobile phones, tablet computers, laptops, digital photo frames, navigators and other products or components with display functions.

Abstract

一种纹路图像获取方法、纹路图像获取电路以及显示面板。该纹路图像获取电路包括感光电路，该纹路图像获取方法包括：使得感光电路接收来自纹路的光，并基于感光电路在第一积分时段内累积的信号量获得第一曲线，第一曲线为残留信号量随着时间的变化曲线，残留信号量为感光电路在第一积分时段前所残留的信号量随着时间释放后剩余的信号量；基于感光电路在第二积分时段内累积的信号量获得第一采集值，第二积分时段在第一积分时段之后；以及基于第一曲线以及第一采集值获得关于纹路的图像的第一感光信号。该纹路图像获取方法可以提高纹路识别的有效性以及准确性。

Description

纹路图像获取方法、纹路图像获取电路及显示面板 技术领域
本公开的实施例涉及一种纹路图像获取方法、纹路图像获取电路及显示面板。
背景技术
随着移动终端的日益普及，越来越多的用户使用移动终端进行身份验证、电子支付等操作。由于皮肤纹路例如指纹图案或掌纹图案的唯一性，结合光学成像的指纹识别技术逐渐被移动电子设备采用以用于身份验证、电子支付等。如何提高纹路识别的准确性是本领域关注的焦点问题。
发明内容
本公开至少一实施例提供一种用于纹路图像获取电路的纹路图像获取方法，所述纹路图像获取电路包括感光电路，所述纹路图像获取方法包括：使得所述感光电路接收来自纹路的光，并基于所述感光电路在第一积分时段内累积的信号量获得第一曲线，所述第一曲线为残留信号量随着时间的变化曲线，所述残留信号量为所述感光电路在所述第一积分时段前所残留的信号量随着时间释放后剩余的信号量；基于所述感光电路在第二积分时段内累积的信号量获得第一采集值，所述第二积分时段在所述第一积分时段之后；以及基于所述第一曲线以及所述第一采集值获得关于所述纹路的图像的第一感光信号。
例如，在本公开一实施例提供的纹路图像获取方法中，基于所述第一曲线以及所述第一采集值获得所述第一感光信号包括：基于所述第一曲线获得所述残留信号量在所述第二积分时段内释放的信号量并记作第一参考值；以及将所述第一采集值减去所述第一参考值以获得所述第一感光信号。
例如，在本公开一实施例提供的纹路图像获取方法中，基于所述感光电路在所述第一积分时段内累积的信号量获得所述第一曲线包括：使得所述第一积分时段包括N个子积分时段；在第n个子积分时段结束时获得所述感光电路在所述第n个子积分时段内累积的信号量并记作第n子采集值；以及根 据N个子采集值获得所述第一曲线；N大于等于2，n满足1≤n≤N。
例如，在本公开一实施例提供的纹路图像获取方法中，基于所述感光电路在所述第一积分时段内累积的信号量获得所述第一曲线包括：使得所述第一积分时段包括第一子积分时段、第二子积分时段以及第三子积分时段；在所述第一子积分时段结束时获得所述感光电路在所述第一子积分时段内累积的信号量并记作第一子采集值，在所述第二子积分时段结束时获得所述感光电路在所述第二子积分时段内累积的信号量并记作第二子采集值，在所述第三子积分时段结束时获得所述感光电路在所述第三子积分时段内累积的信号量并记作第三子采集值；根据所述第一子采集值、所述第二子采集值以及所述第三子采集值获得所述第一曲线。
例如，在本公开一实施例提供的纹路图像获取方法中，所述第一曲线满足第一指数函数y＝ka x，根据所述第一子采集值、所述第二子采集值以及所述第三子采集值获得所述第一曲线包括：根据所述第一子采集值以及所述第一指数函数获得第一等式：F1＝ka 0-ka x1+W1；根据所述第二子采集值以及所述第一指数函数获得第二等式：F2＝ka x1-ka x2+W2；根据所述第三子采集值以及所述第一指数函数获得第三等式：F3＝ka x2-ka x3+W3；以及根据所述第一等式、所述第二等式以及所述第三等式获得所述第一指数函数；F1为所述第一子采集值，F2为所述第二子采集值，F3为所述第三子采集值，x1为所述第一子积分时段结束的时刻，x2为所述第二子积分时段结束的时刻，x3为所述第三子积分时段结束的时刻，W1为所述感光电路在所述第一子积分时段内对来自所述纹路的光进行转换而获得的信号量，W2为所述感光电路在所述第二子积分时段内对来自所述纹路的光进行转换而获得的信号量，W3为所述感光电路在所述第三子积分时段内对来自所述纹路的光进行转换而获得的信号量。
例如，在本公开一实施例提供的纹路图像获取方法中，所述第一子积分时段、所述第二子积分时段以及所述第三子积分时段持续的时间相等。
例如，在本公开一实施例提供的纹路图像获取方法中，所述第一子积分时段持续的时间为10毫秒，所述第二积分时段持续的时间为60毫秒。
例如，在本公开一实施例提供的纹路图像获取方法中，所述第一子积分时段、所述第二子积分时段以及所述第三子积分时段持续的时间相等，所述第一曲线满足第一指数函数y＝ka x，根据所述第一子采集值、所述第二子采 集值以及所述第三子采集值获得所述第一曲线包括：根据所述第一子采集值、所述第二子采集值以及所述第一指数函数获得第四等式：F2-F1＝2ka x1-ka 0-ka x2；根据所述第二子采集值、第三子采集值以及所述第一指数函数获得第五等式：F3-F2＝2ka x2-ka x1-ka x3；以及根据所述第四等式以及所述第五等式获得所述第一指数函数；F1为所述第一子采集值，F2为所述第二子采集值，F3为所述第三子采集值，x1为所述第一子积分时段结束的时刻，x2为所述第二子积分时段结束的时刻，x3为所述第三子积分时段结束的时刻。
例如，本公开一实施例提供的纹路图像获取方法还包括：在重置时段中对所述感光电路进行重置，其中，所述重置时段在所述第一积分时段前。
例如，在本公开一实施例提供的纹路图像获取方法中，所述纹路图像获取电路还包括积分运算电路，所述感光电路包括感光元件和开关电路，所述开关电路和所述感光元件以及所述积分运算电路电连接；在重置时段中对所述感光电路进行重置包括：在所述重置时段中向所述开关电路提供控制信号以使得所述开关电路导通，从而使得所述感光元件通过所述开关电路以及所述积分运算电路释放电荷。
例如，在本公开一实施例提供的纹路图像获取方法中，基于所述感光电路在所述第二积分时段内累积的信号量获得第一采集值包括：在所述第二积分时段开始时，向所述开关电路提供所述控制信号以使得所述开关电路截止，然后在所述第二积分时段结束时，向所述开关电路提供所述控制信号以使得所述开关电路导通，并利用所述积分运算电路进行积分运算从而获得所述第一采集值。
例如，在本公开一实施例提供的纹路图像获取方法中，所述纹路图像获取电路还包括积分运算电路，所述感光电路包括感光元件和开关电路，所述开关电路和所述感光元件以及所述积分运算电路电连接；在第n个子积分时段结束时获得所述感光电路在所述第n个子积分时段内累积的信号量并记作第n子采集值包括：在所述第n个子积分时段开始时，向所述开关电路提供所述控制信号以使得所述开关电路截止，然后在所述第n个子积分时段结束时，向所述开关电路提供所述控制信号以使得所述开关电路导通，并利用所述积分运算电路进行积分运算从而获得所述第n子采集值。
本公开至少一实施例还提供一种纹路图像获取电路，包括感光电路以及控制电路，所述控制电路和所述感光电路电连接，且所述控制电路被配置为： 使得所述感光电路接收来自纹路的光，并基于所述感光电路在第一积分时段内累积的信号量获得第一曲线，所述第一曲线为残留信号量随着时间的变化曲线，所述残留信号量为所述感光电路在所述第一积分时段前所残留的信号量随着时间释放后剩余的信号量；基于所述感光电路在第二积分时段内累积的信号量获得第一采集值，所述第二积分时段在所述第一积分时段之后；以及基于所述第一曲线以及所述第一采集值获得关于所述纹路的图像的第一感光信号。
例如，在本公开一实施例提供的纹路图像获取电路中，所述控制电路还被配置为：基于所述第一曲线获得所述残留信号量在所述第二积分时段内释放的信号量并记作第一参考值；以及将所述第一采集值减去所述第一参考值以获得所述第一感光信号。
例如，在本公开一实施例提供的纹路图像获取电路中，所述控制电路还被配置为：使得所述第一积分时段包括N个子积分时段；在第n个子积分时段结束时获得所述感光电路在所述第n个子积分时段内累积的信号量并记作第n子采集值；以及根据N个子采集值获得所述第一曲线；N大于等于2，n满足1≤n≤N。
例如，在本公开一实施例提供的纹路图像获取电路中，所述控制电路还被配置为：使得所述第一积分时段包括第一子积分时段、第二子积分时段以及第三子积分时段；在所述第一子积分时段结束时获得所述感光电路在所述第一子积分时段内累积的信号量并记作第一子采集值，在所述第二子积分时段结束时获得所述感光电路在所述第二子积分时段内累积的信号量并记作第二子采集值，在所述第三子积分时段结束时获得所述感光电路在所述第三子积分时段内累积的信号量并记作第三子采集值；根据所述第一子采集值、所述第二子采集值以及所述第三子采集值获得所述第一曲线。
例如，在本公开一实施例提供的纹路图像获取电路中，所述第一曲线满足第一指数函数y＝ka x，所述控制电路还被配置为：根据所述第一子采集值以及所述第一指数函数获得第一等式：F1＝ka 0-ka x1+W1；根据所述第二子采集值以及所述第一指数函数获得第二等式：F2＝ka x1-ka x2+W2；根据所述第三子采集值以及所述第一指数函数获得第三等式：F3＝ka x2-ka x3+W3；以及根据所述第一等式、所述第二等式以及所述第三等式获得所述第一指数函数；F1为所述第一子采集值，F2为所述第二子采集值，F3为所述第三子采集值， x1为所述第一子积分时段结束的时刻，x2为所述第二子积分时段结束的时刻，x3为所述第三子积分时段结束的时刻，W1为所述感光电路在所述第一子积分时段内对来自所述纹路的光进行转换而获得的信号量，W2为所述感光电路在所述第二子积分时段内对来自所述纹路的光进行转换而获得的信号量，W3为所述感光电路在所述第三子积分时段内对来自所述纹路的光进行转换而获得的信号量。
例如，本公开一实施例提供的纹路图像获取电路还包括积分运算电路，所述感光电路包括感光元件和开关电路，所述开关电路和所述感光元件以及所述积分运算电路电连接，所述控制电路和所述开关电路电连接；所述控制电路还被配置为：在所述第二积分时段开始时，向所述开关电路提供所述控制信号以使得所述开关电路截止，然后在所述第二积分时段结束时，向所述开关电路提供所述控制信号以使得所述开关电路导通，并利用所述积分运算电路进行积分运算从而获得所述第一采集值。
例如，在本公开一实施例提供的纹路图像获取电路中，所述控制电路还被配置为：在所述第n个子积分时段开始时，向所述开关电路提供所述控制信号以使得所述开关电路截止，然后在所述第n个子积分时段结束时，向所述开关电路提供所述控制信号以使得所述开关电路导通，并利用所述积分运算电路进行积分运算从而获得所述第n子采集值。
本公开至少一实施例还提供一种显示面板，包括显示区域，所述显示区域包括纹路识别区域，在所述显示区域中设置有多个呈阵列排布的像素单元，位于所述纹路识别区域中的像素单元包括如本公开的实施例提供的任一纹路图像获取电路。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，而非对本公开的限制。
图1A为纹路图像获取原理图；
图1B为点光源的成像范围示意图；
图2A为一种纹路图像中的残影的示意图之一；
图2B为一种纹路图像中的残影的示意图之二；
图3为一种感光元件中残留信号量随着时间的变化曲线。
图4为本公开至少一实施例提供的一种纹路图像获取电路的示意图；
图5为本公开至少一实施例提供的另一种纹路图像获取电路的示意图；
图6为本公开至少一实施例提供的一种纹路图像获取方法的示意图；
图7为本公开至少一实施例提供的另一种纹路图像获取方法的示意图；
图8为本公开至少一实施例提供的再一种纹路图像获取方法的示意图；
图9为本公开至少一实施例提供的再一种纹路图像获取方法的示意图；
图10为本公开至少一实施例提供的再一种纹路图像获取方法的示意图；
图11为本公开至少一实施例提供的又一种纹路图像获取方法的示意图；
图12为本公开至少一实施例提供的一种纹路图像获取电路的示意图；
图13为本公开至少一实施例提供的另一种纹路图像获取电路的示意图；
图14为本公开至少一实施例提供的一种纹路图像获取电路的电路图；
图15为本公开至少一实施例提供的一种显示面板的示意图；
图16为本公开至少一实施例提供的一种显示面板中的多个纹路图像获取电路的电路图；以及
图17为本公开至少一实施例提供的另一种显示面板中的多个纹路图像获取电路的电路图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”、“一”或者“该”等类似词语也不表示数量限制，而是表示存在至少一个。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或 者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
目前，窄边框逐渐成为显示装置设计和制造的主流，尤其是对于例如移动电话的便携式显示装置。实现窄边框的手段之一是将具有纹路图像获取功能的感光元件(感光电路)集成到显示面板中，从而实现屏下纹路识别，提高显示面板的显示区域的面积，进而提高屏占比。
例如，可以采用点光源、线光源或者具有一定图案的光源等作为感光元件的感光光源，以进行纹路图像的获取以及进一步的纹路识别。
下面以点光源作为感光元件的感光光源为例，对获取纹路图像的原理进行介绍，但是这并不对本公开的实施例构成限制。
在一种反射式光学纹路图形获取装置中，在纹路图像获取的过程中，如图1A所示，在点光源L1发光时，光以不同的角度照射到纹路按压界面(例如玻璃屏幕外表面)上，由于纹路按压界面的全反射的作用，这些光中入射角大于或等于全反射的临界角θ的部分会发生全反射，导致这部分光线不能从纹路按压界面出射，由此产生全反射区域。相应地，这些光中入射角小于全反射的临界角θ的部分从纹路按压界面出射。因此，可以通过全反射区域反射的光进行纹路图像采集，例如，在纹路成像界面的B1处形成清晰的纹路图像，该纹路图像对应于纹路的位于F1处的部分，F1即为全反射区域，B1即为成像区域。
具体而言，当例如用户手指的指纹按压到全反射区域F1时，指纹的脊触摸到全反射区域F1的表面，因此与指纹的脊相应的位置的全反射条件被破坏，因此光将在该相应的位置出射，使得原有的反射路径被改变，而指纹的谷不会触摸到全反射区域F1的表面，因此与指纹的谷相应的位置的全反射条件没有被破坏，因此在该相应的位置的光仍然被全反射，使得原有的反射路径没有被改变。这样，全反射区域中的光线由于指纹的谷、脊对于全反射条件的不同影响，使得入射到纹路成像界面上的光在不同位置形成明暗相间的纹路图像。
另外，由于从纹路按压界面出射并被指纹等反射的光所造成的干扰，或者光源发出的光还没有到达纹路按压界面就被其他功能层反射至纹路成像界面，纹路成像界面的A1处成为检测无效的区域，该区域不能形成有效的 纹路图像。在无效区A1中，光源L1发出的光中还没有到达纹路按压界面就被其他功能层反射至纹路成像界面的部分以及被纹路按压界面近乎垂直反射的部分亮度较高，基本位于无效区A1的中心位置，由此形成高亮区，该高亮区由于光线亮度较高，因此在感光元件阵列的相应部分产生较大光电信号，容易形成残影，也可称为残影区。
例如，图1B示出了一种点光源的成像范围示意图。如图1B所示，在点光源的感光范围中，有效的成像范围呈环形，即在图1B中，内圆61和外圆62之间的环形区域为有效的成像范围，对应于图1A中与全反射区域F1对应的成像区域B1；该环形的内圆61以内的区域(以下称为环心60)为无效成像区，对应于图1A中的无效区A1；环心60内部的部分区域(阴影区域)63为高亮区(残影区)，该高亮区容易在成像过程中在感光元件阵列中导致残影。
在纹路识别的过程中，一个光源所形成的有效成像范围有限，因此可以同时提供多个并排的光源(例如排列为阵列的多个光源)，并且组合各个光源的有效成像范围从而形成一个更大的有效成像范围。但是，如上所述，对于每个光源仍然存在无效区，因此在一些情况下，仅一个光源阵列仍可能不能满足纹路识别的需求。对此，例如可以采用分时点亮多个光源或多个光源阵列的方式，以形成多个有效成像范围，并且一个光源阵列的有效成像范围覆盖另一个光源阵列的无效区，从而使得这些不同的光源阵列的有效成像范围相叠加、拼接，从而可以获得一个更大的纹路图像。但是，在分时点亮多个光源(或光源阵列)以形成更大范围的纹路图像时，由于相邻两个光源的点亮间隔时间较短，一个光源所形成的高亮区对于感光元件阵列的相应部分的影响不会很快消失，而是会部分地残留在感光元件阵列的该相应部分中。当感光元件阵列的该相应部分位于其他之后点亮的光源的有效成像区中时，上述残留的影响将导致拼接形成的纹路图像中有残影，因此会造成拼接形成的纹路图像不完整，进而导致无法识别纹路图像或者纹路图像识别不准确。另一方面，若延长相邻两个光源的点亮间隔时间，则又会延长纹路图像采集的时间，影响用户体验。
需要说明的是，在本公开的实施例中，将光源阵列相邻两次开始点亮的间隔时间称为一帧，将光源阵列点亮一次而获得的纹路图像称为一个图像帧。例如，在上述纹路图像拼接的方法中，相邻的两帧对应的光源阵列为相邻的 (例如分别组成两个阵列的光源沿预定方向(例如横向或纵向)彼此错开预定间隔)两个不同的光源阵列。当然，在纹路图像获取的过程中，也可以在每帧中同时点亮所有光源阵列，然后将获得的多个图形帧进行处理从而获得最终的纹路图像。
下面从另一个角度对上述残影现象进行说明，例如，感光元件通常采用光敏材料对接收到的光进行光电转换，从而生成载流子电荷，然后例如再对电荷进行模数转换(模拟-数字转换)，从而得到纹路对应的信号量。但是，发明人通过研究发现由于光敏材料(例如非晶硅、砷化镓等半导体材料)本身的材料特性，导致光电转换后生成的电荷可能在短时间内无法从感光元件内完全导出，这就使得在纹路图像获取的过程中，感光元件中的前一帧残留的电荷会与当前帧的电荷进行叠加，从而导致残影现象(lag)，进而导致最后获得的纹路图像不清晰，最终影响纹路识别的有效性以及准确性。
另外，发明人通过研究还发现上述残影现象会随着时间慢慢地减弱甚至消失。例如，图2A和图2B示出了一种采用图像拼接的方法中出现的残影现象的示意图。图2A表示在第一时刻获得的纹路图像，例如，在第一时刻相对位置位于右下角的光源阵列开始点亮；图2B表示在第二时刻获得的纹路图像，且第二时刻晚于第一时刻。图2A和图2B中的LA1表示由于相对位置位于左上角的光源阵列点亮而造成的在前一帧中残留的电荷而产生的残影，LA2表示当前帧中光源阵列正常点亮而形成的亮点。图2B中的残影LA1相对于图2A中的残影LA1减弱了。由图2A和图2B所示，残影现象随着时间的推移会慢慢减弱。
另外，发明人通过研究还发现上述残影现象在减弱时，减弱的速度相对于时间而言并非线性的，存在“前快后慢”现象，即减弱的速度越来越慢。也就是说，感光元件中的前一帧残留的电荷释放的速度越来越慢。例如，图3示出了一种感光元件中残留信号量随着时间的变化曲线C1。因为通常感光元件中的残留的电荷量无法直接获取，所以需要通过一定的电路将残留的电荷量转换为其它参量例如电压值，从而获得对应的残留信号量。
本公开的至少一实施例提供的纹路图像获取方法、纹路图像获取电路以及显示面板即是根据上述残影现象减弱时的变化规律来获得一定积分时段内残留电荷的释放量，进而获得对应纹路图像的感光信号，从而可以提高纹路图像获取的有效性和准确性。
下面结合附图对本公开的实施例及其示例进行详细说明。
本公开的至少一实施例提供一种纹路图像获取方法，例如，该纹路图像获取方法可以用于纹路图像获取电路，图4示出了一种示例性的纹路图像获取电路10，该纹路图像获取电路10包括感光电路100。下面结合图4、图6和图7对该纹路图像获取方法包括的操作步骤进行说明。该纹路图像获取方法包括如下操作步骤。
步骤S100：使得感光电路100接收来自纹路的光，并基于感光电路100在第一积分时段IP1内累积的信号量获得第一曲线C1，第一曲线C1为残留信号量随着时间的变化曲线，残留信号量为感光电路100在第一积分时段IP1前所残留的信号量随着时间释放后剩余的信号量。
步骤S200：基于感光电路100在第二积分时段IP2内累积的信号量获得第一采集值，第二积分时段在第一积分时段之后。
步骤S300：基于第一曲线C1以及第一采集值获得关于纹路的图像的第一感光信号。
例如，如图6和图7所示，在时序上，第二积分时段IP2在第一积分时段IP1之后。例如，如图6所示，在一些实施例中，第二积分时段IP2和第一积分时段IP1在时序上连续，即第二积分时段IP2和第一积分时段IP1中间没有间隔。或者，如图7所示，在其它一些实施例中，第二积分时段IP2和第一积分时段IP1在时序上不连续，即第二积分时段IP2和第一积分时段IP1中间有间隔。
例如，用于前一帧的光源阵列关闭后，用于当前帧的光源阵列开启，此时感光电路100中会存在前一帧残留的电荷。由上述可知，该残留的电荷会随着时间慢慢的释放，同时感光电路100也会将接收到的光例如来自纹路的光转换为电荷。如图4所示，上述纹路图像获取电路10还包括积分运算电路200，例如，该积分运算电路200被配置为对感光电路100累积的电荷量进行积分运算，将模拟的电荷量转换为数字的信号量，从而获得感光电路100累积的电荷量对应的信号量。例如，当感光电路100与积分运算电路200导通时，感光电路100累积的电荷量可以释放至积分运算电路200，该释放的电荷量包括两部分，一部分为前一帧残留的电荷的释放量，另一部分为在当前帧中将接收的光转换后获得的电荷量对应的释放量。需要说明的是，在本公开的实施例中，将感光电路100在第一积分时段IP1前所残留的信号量随 着时间释放后剩余的信号量称为残留信号量，第一曲线C1即为该残留信号量随着时间的变化曲线。
例如，可以在某一个A时段向感光电路100提供控制信号GT使得感光电路100与积分运算电路200不导通，在该A时段中，感光电路100中的残留的电荷会随着时间释放，同时感光电路100还会将接收的光转换为电荷。然后，可以向感光电路100提供控制信号GT以使得感光电路100与积分运算电路200导通，从而感光电路100可以将A时段中累积的电荷释放至积分运算电路200，积分运算电路200可以对接收到的电荷量进行积分运算以获得对应的信号量，例如，可以从积分运算电路200的数据输出端DT获得该信号量，例如，积分运算电路200还被配置为接收参考电压Vref以进行积分运算。
在步骤S100中，由于残留的电荷在第一积分时段IP1中释放的电荷量是随着时间变化的，从而可以根据残留信号量获得第一曲线C1。该第一曲线C1只和残留信号量有关，而与感光电路100将接收到的光进行转换而获得的信号量无关。
在步骤S200中，获得的第一采集值中包括两部分，一部分为残留信号量在第二积分时段IP2中释放的信号量，一部分为感光电路100将接收到的光进行转换后获得的信号量。
然后在步骤S300中，可以基于第一曲线C1以及第一采集值获得关于纹路的图像的第一感光信号。例如，可以基于第一曲线C1将第一采集值中关于残留信号量的那部分去掉，从而使得获得的第一感光信号只与感光电路100接收到的来自纹路的光有关，而不与残留信号量有关。例如，在获得第一感光信号后，可以采用处理电路对该第一感光信号进行进一步处理以获得纹路图像，从而完成纹路识别。采用本公开的实施例提供的纹路图像获取方法可以使得最终获得的第一感光信号只与感光电路100接收到的来自纹路的光有关，而与感光电路100的残留信号量无关，从而可以提高最终进行纹路识别的有效性以及准确性。
例如，在本公开的一些实施例提供的纹路图像获取方法中，上述步骤S300包括如下操作步骤。
步骤S310：基于第一曲线C1获得残留信号量在第二积分时段IP2内释放的信号量并记作第一参考值。
以及步骤S320：将第一采集值减去第一参考值以获得第一感光信号。
例如，在获得第一曲线C1后，就可以获得感光电路100在任意时刻对应的残留信号量的值，然后在步骤S310中就可以基于第一曲线C1获得残留信号量在第二积分时段IP2内释放的信号量即第一参考值。例如，可以基于第一曲线C1获得第二积分时段IP2开始时刻对应的残留信号量的值，并基于第一曲线C1获得第二积分时段IP2结束时刻对应的残留信号量的值，然后将第二积分时段IP2开始时刻对应的残留信号量的值减去第二积分时段IP2结束时刻对应的残留信号量的值，即可以获得第一参考值。然后，在步骤S320中将第一采集值减去第一参考值就可以获得第一感光信号。
根据上述所述，在获得第一曲线C1后，就可以获得感光电路100在任意时刻对应的残留信号量的值，所以在本公开的实施例提供的纹路图像获取方法中，不要求第二积分时段IP2和第一积分时段IP1连续，如图7所示，第二积分时段IP2和第一积分时段IP1也可以不连续，即第二积分时段IP2和第一积分时段IP1中间有间隔。
在本公开的一些实施例提供的纹路图像获取方法中，上述步骤S100的一个示例包括如下操作步骤。
步骤S110：使得第一积分时段IP1包括N个子积分时段。
步骤S120：在第n个子积分时段结束时获得感光电路100在第n个子积分时段内累积的信号量并记作第n子采集值。
以及步骤S130：根据N个子采集值获得第一曲线C1。
N大于等于2，且n满足1≤n≤N。
例如，在一些实施例中，如图8所示，上述N＝3，即上述步骤S100的一个具体示例包括如下操作步骤。
步骤S111：使得第一积分时段IP1包括第一子积分时段SIP1、第二子积分时段SIP2以及第三子积分时段SIP3。例如，第二子积分时段SIP2和第一子积分时段SIP1连续，第三子积分时段SIP3和第二子积分时段SIP2连续。
步骤S121：在第一子积分时段SIP1结束时获得感光电路100在第一子积分时段SIP1内累积的信号量并记作第一子采集值F1，在第二子积分时段SIP2结束时获得感光电路100在第二子积分时段SIP2内累积的信号量并记作第二子采集值F2，在第三子积分时段SIP3结束时获得感光电路100在第三子积分时段SIP3内累积的信号量并记作第三子采集值F3。
以及步骤S131：根据第一子采集值F1、第二子采集值F2以及第三子采集值F3获得第一曲线C1。
例如，在一些实施例中，如图3所示，第一曲线C1满足第一指数函数y＝ka x，则上述步骤S131可以包括如下操作步骤。
步骤S1311：根据第一子采集值F1以及第一指数函数获得第一等式：F1＝ka 0-ka x1+W1。
步骤S1312：根据第二子采集值F2以及第一指数函数获得第二等式：F2＝ka x1-ka x2+W2。
步骤S1313：根据第三子采集值F3以及第一指数函数获得第三等式：F3＝ka x2-ka x3+W3。
以及步骤S1314：根据第一等式、第二等式以及第三等式获得第一指数函数。
上述表达式中，F1为第一子采集值，F2为第二子采集值，F3为第三子采集值，x1为第一子积分时段SIP1结束的时刻，x2为第二子积分时段SIP2结束的时刻，x3为第三子积分时段SIP3结束的时刻，W1为感光电路100在第一子积分时段SIP1内对来自纹路的光进行转换而获得的信号量，W2为感光电路100在第二子积分时段SIP2内对来自纹路的光进行转换而获得的信号量，W3为感光电路100在第三子积分时段SIP3内对来自纹路的光进行转换而获得的信号量。
下面结合图3、图4和图9对上述步骤S111、步骤S121以及步骤S131的一个具体示例进行描述。
例如，如图3、图4和图9所示，在一个示例中，第一子积分时段SIP1、第二子积分时段SIP2以及第三子积分时段SIP3持续的时间相等。例如，在一些实施例中，第一子积分时段SIP1持续的时间为10毫秒(ms)。
例如，在零时刻，向感光电路100提供低电平的控制信号GT，使得感光电路100和积分运算电路200不导通；然后在第一子积分时段SIP1结束时即x1＝10ms时，向感光电路100提供高电平的控制信号GT，使得感光电路100和积分运算电路200导通，从而可以在数据输出端DT获得第一子采集值F1，则F1＝k-ka 10+W1。需要说明的是，在第一子积分时段SIP1中，控制信号GT的脉冲宽度(即处于高电平的时间)例如为微秒(μs)级，所以相对于第一子积分时段SIP1持续的时间来说，控制信号GT的脉冲宽度可以 忽略。类似地，在后面的描述中，相对于第二子积分时段SIP2以及第三子积分时段SIP3持续的时间来说，控制信号GT的脉冲宽度也可以忽略，不再赘述。
第一子积分时段SIP1结束后，进入第二子积分时段SIP2，向感光电路100提供低电平的控制信号GT，使得感光电路100和积分运算电路200不导通；然后在第二子积分时段SIP2结束时即x2＝20ms时，向感光电路100提供高电平的控制信号GT，使得感光电路100和积分运算电路200导通，从而可以在数据输出端DT获得第二子采集值F2，则F2＝k 10-ka 20+W2。
第二子积分时段SIP2结束后，进入第三子积分时段SIP3，向感光电路100提供低电平的控制信号GT，使得感光电路100和积分运算电路200不导通；然后在第三子积分时段SIP3结束时即x3＝30ms时，向感光电路100提供高电平的控制信号GT，使得感光电路100和积分运算电路200导通，从而可以在数据输出端DT获得第三子采集值F3，则F3＝k 20-ka 30+W3。
将第一等式、第二等式以及第三等式组成第一方程组，由于第一子积分时段SIP1、第二子积分时段SIP2以及第三子积分时段SIP3持续的时间均为10ms，所以W1＝W2＝W3，所以该第一方程组有三个方程、三个未知量，通过求解第一方程组即可以获得k与a，从而最终获得第一曲线C1。
例如，在一些实施例提供的纹路图像获取方法中，第二积分时段IP2持续的时间为60ms，根据第一曲线C1以及第二积分时段IP2的起始时刻以及结束时刻就可以获得第一参考值，然后用第一采集值减去第一参考值就可以获得关于纹路的图像的第一感光信号。
需要说明的是，在上述求解第一方程组后也可以获得W1(W2或W3)，即感光电路100在第一子积分时段SIP1(第二子积分时段SIP2或第三子积分时段SIP3)内对来自纹路的光进行转换而获得的信号量，然后对该信号量进行数据处理也可以得到纹路图像。但由于感光电路100中的残留信号量在开始时释放的较多，可能导致上述W1的值较小，从而不利于后续进行数据处理。
本公开的至少一实施例提供的纹路图像获取方法通过设置第二积分时段IP2，由于感光电路100在第二积分时段IP2中的残留信号量已经较少，即第一参考值较小，所以最终获得的第一感光信号中包括的关于纹路图像的信号量较大，从而更有利于后续进行数据处理以获得更有效、更准确的纹路 图像。
需要说明的是，在本公开的一些实施例中，将第一子积分时段SIP1持续的时间设为10毫秒(ms)，以及将第二积分时段IP2持续的时间设为60ms仅是示例性的，本公开的实施例包括但不限于此，根据实际需要，第一子积分时段SIP1以及第二积分时段IP2持续的时间还可以选择其它合适的值。
例如，在另外一些实施例中，如图3所示，第一曲线C1满足第一指数函数y＝ka x，上述步骤S131包括如下操作步骤。
步骤S1315：根据第一子采集值F1、第二子采集值F2以及第一指数函数获得第四等式：F2-F1＝2ka x1-ka 0-ka x2。
步骤S1316：根据第二子采集值F2、第三子采集值F3以及第一指数函数获得第五等式：F3-F2＝2ka x2-ka x1-ka x3。
以及步骤S1317：根据第四等式以及第五等式获得第一指数函数。
上述表达式中，F1为第一子采集值，F2为第二子采集值，F3为第三子采集值，x1为第一子积分时段结束的时刻，x2为第二子积分时段结束的时刻，x3为第三子积分时段结束的时刻。
下面结合图3、图4和图9对上述步骤S111、步骤S121以及步骤S131的一个具体示例进行描述。
例如，如图3、图4和图9所示，在一个示例中，第一子积分时段SIP1、第二子积分时段SIP2以及第三子积分时段SIP3持续的时间相等。例如，在一些实施例中，第一子积分时段SIP1持续的时间为10毫秒(ms)。
例如，在零时刻，向感光电路100提供低电平的控制信号GT，使得感光电路100和积分运算电路200不导通；然后在第一子积分时段SIP1结束时即x1＝10ms时，向感光电路100提供高电平的控制信号GT，使得感光电路100和积分运算电路200导通，从而可以在数据输出端DT获得第一子采集值F1。
第一子积分时段SIP1结束后，进入第二子积分时段SIP2，向感光电路100提供低电平的控制信号GT，使得感光电路100和积分运算电路200不导通；然后在第二子积分时段SIP2结束时即x2＝20ms时，向感光电路100提供高电平的控制信号GT，使得感光电路100和积分运算电路200导通，从而可以在数据输出端DT获得第二子采集值F2。
第二子积分时段SIP2结束后，进入第三子积分时段SIP3，向感光电路 100提供低电平的控制信号GT，使得感光电路100和积分运算电路200不导通；然后在第三子积分时段SIP3结束时即x3＝30ms时，向感光电路100提供高电平的控制信号GT，使得感光电路100和积分运算电路200导通，从而可以在数据输出端DT获得第三子采集值F3。
根据获得的第一子采集值F1以及第二子采集值F2可以获得第四等式：F2-F1＝2ka 10-k-ka 20；根据获得的第二子采集值F2以及第三子采集值F3可以获得第五等式：F3-F2＝2ka 20-ka 10-ka 30。
将第四等式以及第五等式组成第二方程组，该第二方程组有两个方程、两个未知量，通过求解第二方程组即可以获得k与a，从而最终获得第一曲线C1。
需要说明的是，在上述实施例中是以第一积分时段IP1包括三个子积分时段为例进行说明的，本公开的实施例包括但不限于此，例如，在一些情形中，第一曲线C1也可能是关于时间变化的线性曲线，此时只需要使得第一积分时段IP1包括两个子积分时段即可，这里不再赘述。
在本公开的一些实施例提供的纹路图像获取方法中，如图10所示，该纹路图像获取方法还包括如下操作步骤。
步骤S400：在重置时段RP中对感光电路100进行重置，重置时段RP在第一积分时段IP1前。
如图4和图10所示，在重置时段RP中，向感光电路100提供高电平的控制信号GT，使得感光电路100与积分运算电路200导通，感光电路100可以通过积分运算电路200释放电荷，但需要说明的是，经过重置时段RP后，感光电路100中残留的上一帧的电荷不能被释放完。
例如，在一些实施例中，如图5所示，感光电路100包括感光元件110和开关电路120，开关电路120和感光元件110以及积分运算电路200电连接。在这种情形下，上述步骤S400包括如下操作步骤。
步骤S410：在重置时段RP中向开关电路120提供控制信号GT以使得开关电路120导通，从而使得感光元件110通过开关电路120以及积分运算电路200释放电荷。
例如，在一些实施例中，如图5所示，感光电路100包括感光元件110和开关电路120，开关电路120和感光元件110以及积分运算电路200电连接。在这种情形下，上述步骤S200包括如下操作步骤。
步骤S210：在第二积分时段IP2开始时，向开关电路120提供控制信号GT以使得开关电路120截止，然后在第二积分时段IP2结束时，向开关电路120提供控制信号GT以使得开关电路120导通，并利用积分运算电路200进行积分运算从而获得第一采集值。
例如，在一些实施例中，如图5所示，感光电路100包括感光元件110和开关电路120，开关电路120和感光元件110以及积分运算电路200电连接。在这种情形下，上述步骤S120包括如下操作步骤。
步骤S1201：在第n个子积分时段开始时，向开关电路120提供控制信号GT以使得开关电路120截止，然后在第n个子积分时段结束时，向开关电路120提供控制信号GT以使得开关电路120导通，并利用积分运算电路200进行积分运算从而获得第n子采集值。
采用本公开的实施例提供的纹路图像获取方法可以使得最终获得的第一感光信号只与感光电路100接收到的来自纹路的光(即与纹路图像有关的信号量)有关，而与感光电路100的残留信号量无关，从而可以提高最终进行纹路识别的有效性以及准确性。
本公开的至少一实施例还提供一种纹路图像获取电路10，如图12所示，该纹路图像获取电路10包括感光电路100以及控制电路300。控制电路300和感光电路100电连接，且控制电路300被配置为控制执行如下操作。
控制电路300操作来，使得感光电路100接收来自纹路的光，并基于感光电路100在第一积分时段IP1内累积的信号量获得第一曲线C1，第一曲线C1为残留信号量随着时间的变化曲线，残留信号量为感光电路100在第一积分时段IP1前所残留的信号量随着时间释放后剩余的信号量；基于感光电路100在第二积分时段IP2内累积的信号量获得第一采集值，第二积分时段IP2在第一积分时段IP1之后；以及基于第一曲线C1以及第一采集值获得关于纹路的图像的第一感光信号。即控制电路300被配置为控制执行上述操作步骤S100、S200以及S300。
例如，如图12所示，控制电路300还可以与数据输出端DT电连接，从而使得控制电路300可以接收第一采集值。
需要说明的是，关于第一积分时段IP1、第二积分时段IP2、步骤S100、步骤S200以及步骤S300的详细描述可以参考上述关于纹路图像获取方法中的相应描述，这里不再赘述。
如图12所示，本公开的一些实施例提供的纹路图像获取电路10还包括积分运算电路200，该积分运算电路200被配置为对感光电路100累积的电荷量进行积分运算，将模拟的电荷量转换为数字的信号量，从而获得感光电路100累积的电荷量对应的信号量。例如，可以从积分运算电路200的数据输出端DT获得该信号量，例如，积分运算电路200还被配置为接收参考电压Vref以进行积分运算。
在本公开的一些实施例提供的纹路图像获取电路10中，控制电路300还被配置为控制执行如下操作。
基于第一曲线C1获得残留信号量在第二积分时段IP2内释放的信号量并记作第一参考值；以及将第一采集值减去第一参考值以获得第一感光信号。即控制电路300被配置为控制执行上述操作步骤S310和S320。
需要说明的是，关于步骤S310和S320的详细描述可以参考上述关于纹路图像获取方法中的相应描述，这里不再赘述。
在本公开的一些实施例提供的纹路图像获取电路10中，控制电路300还被配置为控制执行如下操作。
控制电路300操作来，使得第一积分时段IP1包括N个子积分时段；在第n个子积分时段结束时获得感光电路100在第n个子积分时段内累积的信号量并记作第n子采集值；以及根据N个子采集值获得第一曲线；N大于等于2，n满足1≤n≤N。即控制电路300被配置为控制执行上述操作步骤S110、S120以及S130。
需要说明的是，关于步骤S110、S120以及S130的详细描述可以参考上述关于纹路图像获取方法中的相应描述，这里不再赘述。
在本公开的一些实施例提供的纹路图像获取电路10中，控制电路300还被配置为控制执行如下操作。
控制电路300操作来，使得第一积分时段IP1包括第一子积分时段SIP1、第二子积分时段SIP2以及第三子积分时段SIP3；在第一子积分时段SIP1结束时获得感光电路100在第一子积分时段SIP1内累积的信号量并记作第一子采集值F1，在第二子积分时段SIP2结束时获得感光电路100在第二子积分时段SIP2内累积的信号量并记作第二子采集值F2，在第三子积分时段SIP3结束时获得感光电路100在第三子积分时段SIP3内累积的信号量并记作第三子采集值F3；以及根据第一子采集值F1、第二子采集值F2以及第三 子采集值F3获得第一曲线C1。即控制电路300被配置为控制执行上述操作步骤S111、S121以及S131。
需要说明的是，关于步骤S111、S121以及S131的详细描述可以参考上述关于纹路图像获取方法中的相应描述，这里不再赘述。
在本公开的一些实施例提供的纹路图像获取电路10中，第一曲线C1满足第一指数函数y＝ka x，控制电路300还被配置为控制执行如下操作。
控制电路300操作来，根据第一子采集值F1以及第一指数函数获得第一等式：F1＝ka 0-ka x1+W1；根据第二子采集值F2以及第一指数函数获得第二等式：F2＝ka x1-ka x2+W2；根据第三子采集值F3以及第一指数函数获得第三等式：F3＝ka x2-ka x3+W3；以及根据第一等式、第二等式以及第三等式获得第一指数函数。F1为第一子采集值，F2为第二子采集值，F3为第三子采集值，x1为第一子积分时段SIP1结束的时刻，x2为第二子积分时段SIP2结束的时刻，x3为第三子积分时段SIP3结束的时刻，W1为感光电路100在第一子积分时段SIP1内对来自纹路的光进行转换而获得的信号量，W2为感光电路100在第二子积分时段SIP2内对来自纹路的光进行转换而获得的信号量，W3为感光电路100在第三子积分时段SIP3内对来自纹路的光进行转换而获得的信号量。即控制电路300被配置为控制执行上述操作步骤S1311、S1312、S1313以及S1314。
需要说明的是，关于步骤S1311、S1312、S1313以及S1314的详细描述可以参考上述关于纹路图像获取方法中的相应描述，这里不再赘述。
在本公开的一些实施例提供的纹路图像获取电路10中，第一曲线C1满足第一指数函数y＝ka x，控制电路300还被配置为控制执行如下操作。
控制电路300操作来，根据第一子采集值F1、第二子采集值F2以及第一指数函数获得第四等式：F2-F1＝2ka x1-ka 0-ka x2；根据第二子采集值F2、第三子采集值F3以及第一指数函数获得第五等式：F3-F2＝2ka x2-ka x1-ka x3；以及根据第四等式以及第五等式获得第一指数函数。即控制电路300被配置为控制执行上述操作步骤S1315、S1316以及S1317。
需要说明的是，关于步骤S1315、S1316以及S1317的详细描述可以参考上述关于纹路图像获取方法中的相应描述，这里不再赘述。
如图13所示，在本公开的一些实施例提供的纹路图像获取电路10中，感光电路100包括感光元件110和开关电路120，开关电路120和感光元件 110以及积分运算电路200电连接，控制电路300和开关电路120电连接。控制电路300还被配置为控制执行如下操作。
在第二积分时段IP2开始时，向开关电路120提供控制信号GT以使得开关电路120截止，然后在第二积分时段IP2结束时，向开关电路120提供控制信号GT以使得开关电路120导通，并利用积分运算电路200进行积分运算从而获得第一采集值。即控制电路300被配置为控制执行上述操作步骤S210。
需要说明的是，关于步骤S210的详细描述可以参考上述关于纹路图像获取方法中的相应描述，这里不再赘述。
在本公开的一些实施例提供的纹路图像获取电路10中，控制电路300还被配置为控制执行如下操作。
控制电路300操作来，在第n个子积分时段开始时，向开关电路120提供控制信号GT以使得开关电路120截止，然后在第n个子积分时段结束时，向开关电路120提供控制信号GT以使得开关电路120导通，并利用积分运算电路200进行积分运算从而获得第n子采集值。即控制电路300被配置为控制执行上述操作步骤S1201。
需要说明的是，关于步骤S1201的详细描述可以参考上述关于纹路图像获取方法中的相应描述，这里不再赘述。
在本公开的一些实施例提供的纹路图像获取电路10中，控制电路300还被配置为控制执行如下操作。
控制电路300操作来，在重置时段RP中向开关电路120提供控制信号GT以使得开关电路120导通，从而使得感光元件110通过开关电路120以及积分运算电路200释放电荷。即控制电路300被配置为控制执行上述操作步骤S410。
需要说明的是，关于步骤S410的详细描述可以参考上述关于纹路图像获取方法中的相应描述，这里不再赘述。
本公开的一些实施例提供的纹路图像获取电路10可以实现为图14中所示的电路结构，需要说明的是，图14中未示出控制电路300。
例如，如图14所示，感光元件110可以采用PIN型二极管，本公开的实施例包括但不限于此，例如感光元件110还可以采用其它类型的光敏二极管(例如PN型二极管或者OPD型二极管)等各种适当类型的感光元件。根 据需要，该感光元件110例如可以仅对某个波长的光(例如红光或绿光)感测，也可以对全部可见光进行感测。
例如，如图14所示，开关电路120可以采用晶体管T，例如该晶体管T为N型晶体管。积分运算电路200可以实现为包括运算放大器D以及存储电容C。
如图14所示，PIN型二极管的第一极(例如阳极)被配置为接收第一电压Vd，PIN型二极管的第二极(例如阴极)和晶体管T的第一极，晶体管T的栅极被配置为接收控制信号GT，晶体管T的第二极和运算放大器D的反相输入端连接，运算放大器D的同相输入端被配置为接收参考电压Vref，存储电容C的第一极和运算放大器D的反相输入端连接，存储电容C的第二极和运算放大器D的输出端连接，运算放大器D的输出端作为数据输出端DT。需要说明的是，为了使得PIN型二极管可以将接收到的光转换为电荷，需使得施加在该PIN型二极管两端的电压为反向电压，即需使得参考电压Vref大于第一电压Vd。例如，参考电压Vref为1V，第一电压Vd为-2V；或者参考电压Vref为1.25V，第一电压Vd为-4V。
需要说明的是，本公开的实施例中采用的晶体管均可以为薄膜晶体管或场效应晶体管或其他特性相同的开关器件。这里采用的晶体管的源极、漏极在结构上可以是对称的，所以其源极、漏极在结构上可以是没有区别的。在本公开的实施例中，为了区分晶体管除栅极之外的两极，直接描述了其中一极为第一极，另一极为第二极，所以本公开的实施例中全部或部分晶体管的第一极和第二极根据需要是可以互换的。例如，本公开的实施例中所述的晶体管的第一极可以为源极，第二极可以为漏极；或者，晶体管的第一极为漏极，第二极为源极。
此外，按照晶体管的特性区分可以将晶体管分为N型和P型晶体管。当晶体管为P型晶体管时，开启电压为低电平电压(例如，0V、-5V、-10V或其他合适的电压)，关闭电压为高电平电压(例如，5V、10V或其他合适的电压)；当晶体管为N型晶体管时，开启电压为高电平电压(例如，5V、10V或其他合适的电压)，关闭电压为低电平电压(例如，0V、-5V、-10V或其他合适的电压)。本公开的实施例中的晶体管以N型晶体管为例进行说明。基于本公开对该实现方式的描述和教导，本领域普通技术人员在没有做出创造性劳动前提下能够容易想到本公开的实施例也可以采用P型晶体管。
下面结合图10所示的信号时序图对图14所示的纹路图像获取电路10的工作原理进行描述。
在重置时段RP中向晶体管T的栅极提供高电平的控制信号GT以使得晶体管T被导通，从而使得PIN型二极管通过晶体管T以及运算放大器D释放电荷。
然后进入第一子积分时段SIP1，向晶体管T的栅极提供低电平的控制信号GT以使得晶体管T被截止，在该第一子积分时段SIP1中，该PIN型二极管一方面可以将接收到的光转换为电荷，另一方面该PIN型二极管中的残留的电荷还会释放。在第一子积分时段SIP1结束时，向晶体管T的栅极提供高电平的控制信号GT以使得晶体管T被导通，该PIN型二极管在第一子积分时段SIP1内累积的电荷会通过晶体管T传输至运算放大器D的反相输入端，然后通过该运算放大器D以及存储电容C的积分运算后，在数据输出端DT获得第一子采集值F1。
该纹路图像获取电路10在第二子积分时段SIP2、第三子积分时段SIP3以及第二积分时段IP2中的工作原理可以参考上述在第一子积分时段SIP1中的描述，这里不再赘述。经过第二子积分时段SIP2、第三子积分时段SIP3以及第二积分时段IP2后可以分别获得第二子采集值F2、第三子采集值F3以及第一采集值。
例如，如图13所示，控制电路300还可以被配置为和数据输出端DT电连接，从而可以从该数据输出端DT接收上述第一子采集值F1、第二子采集值F2、第三子采集值F3以及第一采集值，然后该控制电路300可以根据第一子采集值F1、第二子采集值F2以及第三子采集值F3获得第一曲线C1，然后根据第一曲线C1可以获得第一参考值，最后将第一采集值减去第一参考值以获得第一感光信号。
例如，该控制电路300可以将该第一感光信号传输至后端的处理电路以进行进一步的数据处理，从而根据第一感光信号获得纹路图像。又例如，也可以直接采用该控制电路300对第一感光信号进行处理。
需要说明的是，在本公开的实施例中，第一子采集值F1、第二子采集值F2、第三子采集值F3、第一采集值以及第一参考值例如可以为电压值，本公开的实施例包括但不限于此。
本公开的至少一实施例还提供一种显示面板1，如图15所示，该显示面 板1包括显示区域210，显示区域210包括纹路识别区域211。需要说明的是，在本公开的实施例中纹路识别区域211为操作体在显示面板1上进行纹路识别的区域，图15所示的纹路识别区域211的大小仅是示意性的，例如该纹路识别区域211的大小可以和显示区域210的大小一致，即操作体在显示面板1的显示区域210的任意位置均可以进行纹路识别。
需要说明的是，在本公开的实施例中具有纹路的操作体可以为手，此时纹路图像获取方法中的纹路为皮肤纹路，例如指纹、掌纹等；另外，具有纹路的操作体也可以为具有一定纹路的非生物体，例如采用树脂等材料制作的具有一定纹路的物体，本公开的实施例对此不做具体限定。
例如，如图15所示，在显示区域210中设置有多个呈阵列排布的像素单元阵列，该像素单元阵列包括多个像素单元。这里为了区分不同的像素单元，例如，将位于纹路识别区域211中的像素单元标记为PU2，将位于显示区域210中但不在纹路识别区域211中的像素单元标记为PU1，位于纹路识别区域211中的像素单元PU2包括本公开的实施例提供的任一纹路图像获取电路10。例如，纹路图像获取电路10可以采用薄膜工艺直接形成在显示面板1的显示基板上。
例如，每个像素单元(包括像素单元PU1和像素单元PU2)包括薄膜晶体管与发光器件，发光器件例如包括阳极、阴极以及阳极和阴极之间的发光层。例如，显示面板1的像素单元阵列被用于实现为光源阵列，多个像素单元实现为形成多个光源。也即，显示面板1的像素单元被复用为感光光源，因此可以提高该显示面板的紧凑性、降低各功能结构的布置难度。例如，每个感光光源包括一个或多个像素单元，从而感光光源可以通过一个或多个像素单元的不同排布形成为具有一定形状的点状光源、线状光源、Z字形光源或者回字形光源等。
例如，显示面板1的整个显示区域210中的像素单元都可以受控以被复用为感光光源，纹路图像获取电路10也可以相应地布置在每一个像素单元中，由此可以实现全屏纹路识别。
例如，如图15所示，该显示面板1还包括围绕显示区域210的周边区域220，例如，可以将纹路图像获取电路10中的控制电路300设置在周边区域220中。
例如，当纹路识别区域211中包括多行像素单元PU2时，图16示出了 一种设置纹路图像获取电路10的示例(仅示意一列像素单元PU2)。如图16所示，第一行像素单元PU2中的纹路图像获取电路10包括PIN型二极管PIN(1)、晶体管T(1)、运算放大器D(1)以及存储电容C(1)，并从数据输出端DT(1)输出各个采集值。图中的各个标注中括号内的数字表示对应的行数，以下各实施例与此相同，不再赘述。
如图16所示，每一个纹路图像获取电路10单独设置一个运算放大器以及存储电容，可以降低相邻行像素单元中的纹路图像获取电路10之间的相互影响。
又例如，在其它一些实施例中，如图17所示，多个纹路图像获取电路10也可以共用同一个积分运算电路200(运算放大器D和存储电容C)，这样可以减小所需要设置的多个纹路图像获取电路10所占用的面积。图11示出了一种用于图17所示的多个纹路图像获取电路的信号时序图，如图11所示，由于位于同一列不同行的像素单元中的纹路图像获取电路要共用同一个积分运算电路200，所以不同行的像素单元中的纹路图像获取电路的控制信号(GT(1)、GT(2)、GT(3)、...、GT(n))在时序上依次提供。
如图15所示，该显示面板1还包括处理电路400，该处理电路400和纹路识别区域211中的像素单元PU2电连接，例如和像素单元PU2中的纹路图像获取电路10中的控制电路300电连接，该处理电路400被配置为对多个纹路图像获取电路10获得的多个第一感光信号进行处理以获得纹路图像。该处理电路400可以采用通用处理器或专用处理器实现，本公开的实施例对此不做限定。
在上述实施例提供的显示面板1中，将纹路图像获取电路10直接形成在显示面板1的显示基板上并集成在像素单元PU2中，此时可以将像素单元PU2复用为纹路图像获取电路10的感光光源。本公开的实施例包括但不限于此，例如，还可以单独提供纹路图像获取电路10，例如将纹路图像获取电路10贴附在显示面板1的显示基板的背面，在这种情形下，需要单独提供作为纹路图像获取电路10的感光光源的发光元件。
例如，显示面板1为有机发光二极管(Organic Light Emitting Diode，OLED)显示面板或者量子点发光二极管(Quantum Dot Light Emitting Diodes，QLED)显示面板等，本公开的实施例对此不作具体限定。OLED显示面板例如可以为柔性OLED显示面板。OLED显示面板具有自发光特性，并且其像 素单元的发光还可以根据需要进行控制或调制，从而可以为纹路图像的获取提供便利，而且有助于提高集成度。当操作体触摸本公开的实施例提供的显示面板1的纹路识别区域211时，纹路识别区域211中的像素单元PU2中的纹路图像获取电路10可以接收来自纹路的光，例如来自纹路反射的光，同时采用本公开的实施例提供的纹路图像获取方法可以使得最终获得的第一感光信号只与感光电路100接收到的来自纹路的光有关，而与感光电路100的残留信号量无关，从而可以提高纹路识别的有效性以及准确性。
本公开的至少一实施例还提供一种显示装置，该显示装置包括本公开的实施例提供的任一显示面板1，本实施例中的显示装置可以为：液晶面板、液晶电视、显示器、OLED面板、OLED电视、电子纸、手机、平板电脑、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
本公开的实施例提供的显示装置的技术效果，可以参考上述实施例中关于纹路图像获取方法以及显示面板1的相应描述，这里不再赘述。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (20)

  1. 一种用于纹路图像获取电路的纹路图像获取方法，其中，所述纹路图像获取电路包括感光电路，
    所述纹路图像获取方法包括：
    使得所述感光电路接收来自纹路的光，并基于所述感光电路在第一积分时段内累积的信号量获得第一曲线，所述第一曲线为残留信号量随着时间的变化曲线，所述残留信号量为所述感光电路在所述第一积分时段前所残留的信号量随着时间释放后剩余的信号量；
    基于所述感光电路在第二积分时段内累积的信号量获得第一采集值，所述第二积分时段在所述第一积分时段之后；以及
    基于所述第一曲线以及所述第一采集值获得关于所述纹路的图像的第一感光信号。
  2. 根据权利要求1所述的纹路图像获取方法，其中，基于所述第一曲线以及所述第一采集值获得所述第一感光信号包括：
    基于所述第一曲线获得所述残留信号量在所述第二积分时段内释放的信号量并记作第一参考值；以及
    将所述第一采集值减去所述第一参考值以获得所述第一感光信号。
  3. 根据权利要求1或2所述的纹路图像获取方法，其中，基于所述感光电路在所述第一积分时段内累积的信号量获得所述第一曲线包括：
    使得所述第一积分时段包括N个子积分时段；
    在第n个子积分时段结束时获得所述感光电路在所述第n个子积分时段内累积的信号量并记作第n子采集值；以及
    根据N个子采集值获得所述第一曲线；
    其中，N大于等于2，n满足1≤n≤N。
  4. 根据权利要求3所述的纹路图像获取方法，其中，基于所述感光电路在所述第一积分时段内累积的信号量获得所述第一曲线包括：
    使得所述第一积分时段包括第一子积分时段、第二子积分时段以及第三子积分时段；
    在所述第一子积分时段结束时获得所述感光电路在所述第一子积分时段内累积的信号量并记作第一子采集值，在所述第二子积分时段结束时获得 所述感光电路在所述第二子积分时段内累积的信号量并记作第二子采集值，在所述第三子积分时段结束时获得所述感光电路在所述第三子积分时段内累积的信号量并记作第三子采集值；
    根据所述第一子采集值、所述第二子采集值以及所述第三子采集值获得所述第一曲线。
  5. 根据权利要求4所述的纹路图像获取方法，其中，所述第一曲线满足第一指数函数y＝ka x，根据所述第一子采集值、所述第二子采集值以及所述第三子采集值获得所述第一曲线包括：
    根据所述第一子采集值以及所述第一指数函数获得第一等式：F1＝ka 0-ka x1+W1；
    根据所述第二子采集值以及所述第一指数函数获得第二等式：F2＝ka x1-ka x2+W2；
    根据所述第三子采集值以及所述第一指数函数获得第三等式：F3＝ka x2-ka x3+W3；以及
    根据所述第一等式、所述第二等式以及所述第三等式获得所述第一指数函数；
    其中，F1为所述第一子采集值，F2为所述第二子采集值，F3为所述第三子采集值，x1为所述第一子积分时段结束的时刻，x2为所述第二子积分时段结束的时刻，x3为所述第三子积分时段结束的时刻，W1为所述感光电路在所述第一子积分时段内对来自所述纹路的光进行转换而获得的信号量，W2为所述感光电路在所述第二子积分时段内对来自所述纹路的光进行转换而获得的信号量，W3为所述感光电路在所述第三子积分时段内对来自所述纹路的光进行转换而获得的信号量。
  6. 根据权利要求4或5所述的纹路图像获取方法，其中，所述第一子积分时段、所述第二子积分时段以及所述第三子积分时段持续的时间相等。
  7. 根据权利要求4-6任一项所述的纹路图像获取方法，其中，所述第一子积分时段持续的时间为10毫秒，所述第二积分时段持续的时间为60毫秒。
  8. 根据权利要求4所述的纹路图像获取方法，其中，所述第一子积分时段、所述第二子积分时段以及所述第三子积分时段持续的时间相等，所述第一曲线满足第一指数函数y＝ka x，根据所述第一子采集值、所述第二子采集值以及所述第三子采集值获得所述第一曲线包括：
    根据所述第一子采集值、所述第二子采集值以及所述第一指数函数获得第四等式：F2-F1＝2ka x1-ka 0-ka x2；
    根据所述第二子采集值、第三子采集值以及所述第一指数函数获得第五等式：F3-F2＝2ka x2-ka x1-ka x3；以及
    根据所述第四等式以及所述第五等式获得所述第一指数函数；
    其中，F1为所述第一子采集值，F2为所述第二子采集值，F3为所述第三子采集值，x1为所述第一子积分时段结束的时刻，x2为所述第二子积分时段结束的时刻，x3为所述第三子积分时段结束的时刻。
  9. 根据权利要求1-8任一项所述的纹路图像获取方法还包括：
    在重置时段中对所述感光电路进行重置，其中，所述重置时段在所述第一积分时段前。
  10. 根据权利要求9所述的纹路图像获取方法，其中，所述纹路图像获取电路还包括积分运算电路，
    所述感光电路包括感光元件和开关电路，所述开关电路和所述感光元件以及所述积分运算电路电连接；
    在重置时段中对所述感光电路进行重置包括：在所述重置时段中向所述开关电路提供控制信号以使得所述开关电路导通，从而使得所述感光元件通过所述开关电路以及所述积分运算电路释放电荷。
  11. 根据权利要求10所述的纹路图像获取方法，其中，基于所述感光电路在所述第二积分时段内累积的信号量获得第一采集值包括：
    在所述第二积分时段开始时，向所述开关电路提供所述控制信号以使得所述开关电路截止，然后在所述第二积分时段结束时，向所述开关电路提供所述控制信号以使得所述开关电路导通，并利用所述积分运算电路进行积分运算从而获得所述第一采集值。
  12. 根据权利要求3所述的纹路图像获取方法，其中，所述纹路图像获取电路还包括积分运算电路，
    所述感光电路包括感光元件和开关电路，所述开关电路和所述感光元件以及所述积分运算电路电连接；
    在第n个子积分时段结束时获得所述感光电路在所述第n个子积分时段内累积的信号量并记作第n子采集值包括：在所述第n个子积分时段开始时，向所述开关电路提供所述控制信号以使得所述开关电路截止，然后在所述第 n个子积分时段结束时，向所述开关电路提供所述控制信号以使得所述开关电路导通，并利用所述积分运算电路进行积分运算从而获得所述第n子采集值。
  13. 一种纹路图像获取电路，包括感光电路以及控制电路，其中，
    所述控制电路和所述感光电路电连接，且所述控制电路被配置为：
    使得所述感光电路接收来自纹路的光，并基于所述感光电路在第一积分时段内累积的信号量获得第一曲线，所述第一曲线为残留信号量随着时间的变化曲线，所述残留信号量为所述感光电路在所述第一积分时段前所残留的信号量随着时间释放后剩余的信号量；
    基于所述感光电路在第二积分时段内累积的信号量获得第一采集值，所述第二积分时段在所述第一积分时段之后；以及
    基于所述第一曲线以及所述第一采集值获得关于所述纹路的图像的第一感光信号。
  14. 根据权利要求13所述的纹路图像获取电路，其中，所述控制电路还被配置为：
    基于所述第一曲线获得所述残留信号量在所述第二积分时段内释放的信号量并记作第一参考值；以及
    将所述第一采集值减去所述第一参考值以获得所述第一感光信号。
  15. 根据权利要求13或14所述的纹路图像获取电路，其中，所述控制电路还被配置为：
    使得所述第一积分时段包括N个子积分时段；
    在第n个子积分时段结束时获得所述感光电路在所述第n个子积分时段内累积的信号量并记作第n子采集值；以及
    根据N个子采集值获得所述第一曲线；
    其中，N大于等于2，n满足1≤n≤N。
  16. 根据权利要求15所述的纹路图像获取电路，其中，所述控制电路还被配置为：
    使得所述第一积分时段包括第一子积分时段、第二子积分时段以及第三子积分时段；
    在所述第一子积分时段结束时获得所述感光电路在所述第一子积分时段内累积的信号量并记作第一子采集值，在所述第二子积分时段结束时获得 所述感光电路在所述第二子积分时段内累积的信号量并记作第二子采集值，在所述第三子积分时段结束时获得所述感光电路在所述第三子积分时段内累积的信号量并记作第三子采集值；
    根据所述第一子采集值、所述第二子采集值以及所述第三子采集值获得所述第一曲线。
  17. 根据权利要求16所述的纹路图像获取电路，其中，所述第一曲线满足第一指数函数y＝ka x，所述控制电路还被配置为：
    根据所述第一子采集值以及所述第一指数函数获得第一等式：F1＝ka 0-ka x1+W1；
    根据所述第二子采集值以及所述第一指数函数获得第二等式：F2＝ka x1-ka x2+W2；
    根据所述第三子采集值以及所述第一指数函数获得第三等式：F3＝ka x2-ka x3+W3；以及
    根据所述第一等式、所述第二等式以及所述第三等式获得所述第一指数函数；
    其中，F1为所述第一子采集值，F2为所述第二子采集值，F3为所述第三子采集值，x1为所述第一子积分时段结束的时刻，x2为所述第二子积分时段结束的时刻，x3为所述第三子积分时段结束的时刻，W1为所述感光电路在所述第一子积分时段内对来自所述纹路的光进行转换而获得的信号量，W2为所述感光电路在所述第二子积分时段内对来自所述纹路的光进行转换而获得的信号量，W3为所述感光电路在所述第三子积分时段内对来自所述纹路的光进行转换而获得的信号量。
  18. 根据权利要求15-17任一项所述的纹路图像获取电路，还包括积分运算电路，其中，
    所述感光电路包括感光元件和开关电路，所述开关电路和所述感光元件以及所述积分运算电路电连接，所述控制电路和所述开关电路电连接；
    所述控制电路还被配置为：
    在所述第二积分时段开始时，向所述开关电路提供所述控制信号以使得所述开关电路截止，然后在所述第二积分时段结束时，向所述开关电路提供所述控制信号以使得所述开关电路导通，并利用所述积分运算电路进行积分运算从而获得所述第一采集值。
  19. 根据权利要求18所述的纹路图像获取电路，其中，所述控制电路还被配置为：
    在所述第n个子积分时段开始时，向所述开关电路提供所述控制信号以使得所述开关电路截止，然后在所述第n个子积分时段结束时，向所述开关电路提供所述控制信号以使得所述开关电路导通，并利用所述积分运算电路进行积分运算从而获得所述第n子采集值。
  20. 一种显示面板，包括显示区域，所述显示区域包括纹路识别区域，其中，
    在所述显示区域中设置有多个呈阵列排布的像素单元，位于所述纹路识别区域中的像素单元包括如权利要求13-19任一项所述的纹路图像获取电路。
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080031531A1 (en) * 2006-08-03 2008-02-07 Nec Corporation Line noise eliminating apparatus, line noise eliminating method, and line noise eliminating program
CN107977627A (zh) * 2017-11-30 2018-05-01 北京集创北方科技股份有限公司 纹路的光学检测装置、电子设备及纹路的光学检测方法
US10102415B1 (en) * 2018-03-29 2018-10-16 Secugen Corporation Method and apparatus for simultaneous multiple fingerprint enrollment
CN109508683A (zh) * 2018-11-21 2019-03-22 京东方科技集团股份有限公司 用于显示装置的纹路识别方法、纹路检测芯片及显示装置
CN109614958A (zh) * 2019-01-04 2019-04-12 合肥京东方光电科技有限公司 一种液晶显示装置、纹路识别方法及电子设备

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57162579A (en) * 1981-03-31 1982-10-06 Canon Inc Image pickup device
US6668071B1 (en) * 1997-04-04 2003-12-23 Viktor Albertovich Minkin Method and apparatus for user identification using pulsating light source
JP4154874B2 (ja) 2001-07-30 2008-09-24 カシオ計算機株式会社 指紋読取装置および指紋読取方法
JP5144217B2 (ja) 2007-10-31 2013-02-13 株式会社日立製作所 撮像装置、撮像装置の製造方法及び撮像装置を搭載した装置
US10931859B2 (en) 2016-05-23 2021-02-23 InSyte Systems Light emitter and sensors for detecting biologic characteristics
TW201915818A (zh) * 2017-10-05 2019-04-16 香港商印芯科技股份有限公司 光學識別模組
WO2019127577A1 (zh) * 2017-12-30 2019-07-04 深圳信炜科技有限公司 感光装置的光感测方法
CN111222386B (zh) * 2018-11-27 2023-11-10 上海耕岩智能科技有限公司 指纹采集方法及装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080031531A1 (en) * 2006-08-03 2008-02-07 Nec Corporation Line noise eliminating apparatus, line noise eliminating method, and line noise eliminating program
CN107977627A (zh) * 2017-11-30 2018-05-01 北京集创北方科技股份有限公司 纹路的光学检测装置、电子设备及纹路的光学检测方法
US10102415B1 (en) * 2018-03-29 2018-10-16 Secugen Corporation Method and apparatus for simultaneous multiple fingerprint enrollment
CN109508683A (zh) * 2018-11-21 2019-03-22 京东方科技集团股份有限公司 用于显示装置的纹路识别方法、纹路检测芯片及显示装置
CN109614958A (zh) * 2019-01-04 2019-04-12 合肥京东方光电科技有限公司 一种液晶显示装置、纹路识别方法及电子设备

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3985550A4 *

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