TWM610329U - Optical fingerprint sensing apparatus - Google Patents

Abstract

An optical fingerprint sensing apparatus is provided, which includes a sensing pixel array and a processing circuit. The sensing pixel array includes P*Q sensing pixel units which arranged as multiple columns and multiple rows. Each sensing pixel unit correspondingly outputs a sensing signal. The processing circuit is coupled to the sensing pixel array and configures a plurality of gain parameters. The processing circuit generates a fingerprint image based on the sensing signals outputted by the sensing pixel units and the gain parameters. The fingerprint image includes M*N image pixels. The image pixels of the fingerprint image are respectively corresponding to the gain parameters. The processing circuit configures one of the gain parameters being different from another one of the gain parameters.

Description

Optical fingerprint sensing device

This new creation relates to a sensing device, and in particular to a fingerprint sensing device.

In recent years, fingerprint recognition technology has been widely used in various electronic devices to provide identity verification functions. At present, some fingerprint sensing solutions adopt the method of arranging the fingerprint sensing device on the back of the electronic device, but this kind of fingerprint sensing solution cannot be used in a situation where the electronic device is placed on a desktop. In addition, with the development trend of palm-sized electronic devices towards full screens, fingerprint on display (FOD) sensing solutions have been developed. Among them, the optical under-screen fingerprint sensing solution is to arrange the image sensor below the display panel, so that the user can touch or press a finger on the top of the display panel, so that the fingerprint sensor can obtain a fingerprint image. Therefore, how to perform accurate fingerprint recognition based on the fingerprint image generated by the image sensor is a subject of considerable concern to those skilled in the art.

However, in the process of using the image sensor to sense fingerprint images, the amount of light sensed by each sensing pixel unit in the image sensor will be affected by the process conditions of the image sensor, the conditions of the illumination light source, and the top of the image sensor. The optical characteristics of the optical structure or the influence of other factors. For example, the coating material above the image sensor may have different light transmittance due to the difference in thickness, so that the amount of light sensed by different sensing pixel units is affected. In other words, the image sensor may affect the image quality of the fingerprint image based on the above-mentioned various factors. For example, the image sensor may generate a fingerprint image with brighter peripheral areas but darker central areas. Or, the image sensor may produce a fingerprint image with a brighter area on the left but a darker area on the right. As shown in FIG. 1, FIG. 1 is an example of an image with uneven brightness generated by an image sensor of a fingerprint sensor device. Even if the ambient light sources are sufficient and consistent, the signals of the sensing signals output by the sensing pixel units of the R-th row of the sensing pixel array 10 must be inconsistent.

In view of this, the present invention provides an optical fingerprint sensing device, which can improve the uneven brightness of the fingerprint image, thereby improving the image quality of the fingerprint image.

The creative embodiment of the present invention proposes an optical fingerprint sensing device, which includes a sensing pixel array and a processing circuit. The sensing pixel array includes P*Q sensing pixel units. The aforementioned sensing pixel units are arranged in multiple rows and multiple columns, and each sensing pixel unit correspondingly outputs a sensing signal, where P and Q are integers greater than zero. The processing circuit is coupled to the sensing pixel array and configures multiple gain parameters. The processing circuit generates a fingerprint image based on the sensing signal and the gain parameter output by each sensing pixel unit, and the fingerprint image includes M*N image pixels. Where M is an integer greater than 0 and less than or equal to P, and N is an integer greater than 0 and less than or equal to Q. The image pixels of the aforementioned fingerprint image are respectively associated with gain parameters. The processing circuit configures one of the gain parameters to be different from the other one of the gain parameters.

Based on the above, in the inventive embodiment of the present invention, by generating different image pixels on the fingerprint image according to different gain parameters, the problem of uneven brightness of the fingerprint image can be improved, thereby improving the image quality of the fingerprint image.

In order to make the content of the new creation easier to understand, the following specific examples are given as examples on which the new creation can indeed be implemented. In addition, wherever possible, elements/components/steps with the same reference numbers in the drawings and embodiments represent the same or similar components.

It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or Intermediate elements can also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements. As used herein, "connection" can refer to physical and/or electrical connection. Furthermore, "electrically connected" or "coupled" may mean that there are other elements between two elements.

Please refer to FIG. 2, the fingerprint sensing device 100 includes a sensing pixel array 110 and a processing circuit 120. The sensing pixel array 110 includes P*Q sensing pixel units (P and Q are integers greater than 0), and these sensing pixel units are arranged in multiple rows and multiple columns. The sensing pixel units on the sensing pixel array 110 may be passive pixel sensing elements (Passive Pixel Sensor, PPS), active pixel sensing elements (Active Pixel Sensor, APS), or digital pixel sensing elements (Digital Pixel Sensor). Sensor, DPS), this new creation is not limited. Each sensing pixel unit outputs a corresponding sensing signal based on the light sensing result. Specifically, the sensing pixel units may each include at least one photodiode for photoelectric conversion. The photodiode can generate a voltage signal corresponding to the intensity of the light signal illuminating the sensing pixel unit. In addition, in an embodiment, other optical elements, such as lenses, collimators, filter layers, etc., may be disposed above the sensing pixel array 110, which is not limited in the present invention.

The processing circuit 120 is coupled to the sensing pixel array 110. The processing circuit 120 may include a control circuit and a driving circuit for controlling the sensing pixel array 110, an analog-to-digital conversion circuit, an amplifying circuit, a pixel reading circuit, an image signal processing circuit, and so on. The processing circuit 120 generates a fingerprint image according to the sensing signal corresponding to the output of each sensing pixel unit of the sensing pixel array 110 for subsequent fingerprint recognition processing by a subsequent circuit (such as an application processor). In one embodiment, the sensing pixel units on the sensing pixel array 110 are exposed to fingerprint reflection light for an exposure time, and the sensing pixel units output corresponding voltage signals column by column according to the charge generated by the photodiode (ie, sensing Signal). After the aforementioned voltage signal is amplified, it is sent to the analog-digital conversion circuit, and the analog-digital conversion circuit generates corresponding digital image data according to the sensing signal output by the sensing pixel unit.

In one embodiment, the processing circuit 120 may be configured with multiple gain parameters, and generate a fingerprint image based on the sensing signal output by each sensing pixel unit and the corresponding gain parameter. The fingerprint image may include M*N image pixels (M is an integer greater than 0 and less than or equal to P, and N is an integer greater than 0 and less than or equal to Q). The image pixels of the fingerprint image are respectively associated with gain parameters. In one embodiment, the processing circuit 120 can generate an image pixel of the fingerprint image according to a sensing signal output by a sensing pixel unit and a gain parameter, that is, M equals P and N equals Q. In another embodiment, the processing circuit 120 may generate an image pixel of the fingerprint image according to the sensing signal output by the plurality of sensing pixel units and a gain parameter, that is, M is less than P and N is less than Q. It is worth mentioning that one of the configurable gain parameters of the processing circuit 120 is different from the other of the gain parameters. In other words, at least two image pixels on the fingerprint image are generated based on different gain parameters.

In one embodiment, the signal level of the sensing signal output by one of the sensing pixel units is controlled by one of the gain parameters, and the signal level of the sensing signal output by the other of the sensing pixel units is controlled One of the gain parameters. In detail, these gain parameters may include the amplifier gains of multiple row amplifiers in the pixel reading circuit or the amplifier gains of one sensing output amplifier in the pixel reading circuit. That is, the two sensing signals output by at least two sensing pixel units are amplified based on different amplifier gains. At least two image pixels on the fingerprint image are generated based on different amplifier gains. In this way, by configuring different amplifier gains for different sensing positions on the sensing pixel array 110, the uneven brightness of the fingerprint image can be improved.

In one embodiment, these gain parameters may include the number of sensing pixel units used to generate one image pixel of the fingerprint image, which is referred to herein as the number of superimposed pixels. That is, at least two image pixels on the fingerprint image are generated based on the sensing signals of different numbers of sensing pixel units. In this way, by arranging different numbers of superimposed pixels for different sensing positions on the sensing pixel array 110, the uneven brightness of the fingerprint image can be improved.

In an embodiment, the gain parameters may include the exposure time used by each of the plurality of sensing pixel units. Specifically, the processing circuit 120 can configure and control the exposure time of each sensing pixel unit. One of the sensing pixel units performs sensing and imaging according to the first exposure time, and the other of the sensing pixel units performs sensing and imaging according to the second exposure time. That is, at least two of the sensing pixel units in the sensing pixel array 110 perform sensing and imaging according to the first exposure time and the second exposure time respectively, and the first exposure time is different from the second exposure time. For example, a part of the sensing pixel units located in the peripheral area of the sensing pixel array 110 can perform sensing, sensing and imaging according to the first exposure time, and another part of the sensing pixel units located in the central area of the sensing pixel array 110 can be based on The second exposure time is for sensing, sensing and capturing. In addition, in one embodiment, the exposure time of each sensing pixel unit in the sensing pixel array 110 can be independently controlled, so that each sensing pixel unit can perform sensing and imaging according to the configured exposure time and output a corresponding sensor. Test signal. In this way, by configuring different exposure times for different sensing positions on the sensing pixel array 110, the uneven brightness of the fingerprint image can be improved.

In addition to the above-mentioned embodiments, based on different design principles of the image sensor array 110, the configurable gain parameter of the processing circuit 120 may also include the amplifier gain of an amplifier provided in each sensing pixel unit. Alternatively, the configurable gain parameter of the processing circuit 120 may also include the capacitance value of the variable capacitor inside each sensing pixel unit.

Fig. 3 is a schematic diagram of an optical fingerprint sensing device according to an embodiment of the invention. 3, the processing circuit 120 may include a pixel readout circuit 121, an image signal processing circuit 122, a driving circuit 123, and a control circuit 124. The control circuit 123 can perform timing control so that the driving circuit 123 drives the sensing pixel unit column by column (for example, the P-th sensing pixel unit P1 in the first column). The sensing pixel unit responds to the driving of the driving circuit 123 to output sensing signals to the pixel readout circuit 121 column by column.

After the signal amplification operation and the analog-to-digital conversion operation are performed, the pixel readout circuit 121 can output digital image data to the image signal processing circuit 122, so that the image signal processing circuit 122 can generate the fingerprint image Img_f. In an embodiment, the control circuit 123 can control the amplifier gain of the amplifier inside the pixel readout circuit 121. The amplifier inside the pixel readout circuit 121 may include a row amplifier corresponding to each row of sensing pixel units or a common sensing output amplifier for each sensing pixel unit.

In addition, in one embodiment, the pixel readout circuit 121 may further include an integrator circuit to integrate the sensing signals of the plurality of sensing pixel units in each sensing block to generate each image on the fingerprint image Pixels. The control circuit 123 can control the number of superimposed pixels for integration operation by switching the switching element inside the integrator circuit.

Fig. 4 is a schematic diagram of the amplifier gain of the configured line amplifier according to an embodiment of the invention. Referring to FIG. 4, the pixel readout circuit 121 may include row amplifiers A1_1 to A1_P corresponding to multiple rows of sensing pixel units, respectively. The row amplifiers A1_1 to A1_P correspondingly amplify the sensing signal output by the sensing pixel unit of each row. For example, the row amplifier A1_1 is used to amplify the sensing signal output by the first row of sensing pixel units. The row amplifier A1_2 is used to amplify the sensing signal output by the second row of sensing pixel units. So on and so forth.

In one embodiment, the first row amplifier among the row amplifiers A1_1 to A1_P receives the sensing signal from one of the sensing pixel units, and the processing circuit 120 configures the first row amplifier to have the first amplifier gain. The second row amplifier of the row amplifiers A1_1 to A1_P receives the sensing signal of the other one of the sensing pixel units, and the processing circuit 120 configures the second row amplifier to have a second amplifier gain. The gain of the first amplifier is different from the gain of the second amplifier. That is, the amplifier gains of at least two of the row amplifiers A1_1 to A1_P are configured to be different from each other.

In detail, in one embodiment, when the sensor pixel unit in the a-th column is driven to output the sensing signal, the control circuit 124 can control the amplifier gains of the row amplifiers A1_1 to A1_P by outputting the gain control signals S1 to SP. As a result, the row amplifiers A1_1 to A1_P amplify the sensing signals output by the sensing pixel units in the a-th column according to their respective amplifier gains. The row amplifier A1_1 (ie, the first row amplifier) receives the sensing signal of the sensing pixel unit Pa1, and the processing circuit 120 configures the row amplifier A1_1 to have the first amplifier gain. The row amplifier A1_2 (ie, the second row amplifier) receives the sensing signal of the sensing pixel unit Pa2, and the processing circuit 120 configures the row amplifier A1_2 to have the second amplifier gain. Therefore, the row amplifier A1_1 can amplify the sensing signal output by the sensing pixel unit Pa1 according to the first amplifier gain, and the row amplifier A1_2 can amplify the sensing signal output by the sensing pixel unit Pa2 according to the second amplifier gain.

Then, when the sensing pixel unit in the b-th column is driven to output the sensing signal, the control circuit 124 can control the amplifier gains of the row amplifiers A1_1 to A1_P by outputting the gain control signals S1 to SP, so that the row amplifiers A1_1 to A1_P are The gain of the amplifier is used to amplify the sensing signal output by the sensing pixel unit in the b-th column. It should be noted that for the row amplifier A1_1, the amplifier gain used to amplify the sensing pixel unit Pb1 may be configured to be different from the amplifier gain used to amplify the sensing pixel unit Pa1.

FIG. 5 is a schematic diagram of the amplifier gain of the configured sensing output amplifier according to an embodiment of the present invention. Referring to FIG. 5, the pixel readout circuit 121 may include read selection devices SW1 to SW and a sense output amplifier A2. The read selection devices SW1 to SWP are coupled to the input terminals of the sense output amplifier A2. By sequentially turning on the read selection devices SW1 to SWP one by one, the sensing output amplifier A2 sequentially amplifies the sensing signal output by each sensing pixel unit.

In one embodiment, the sensing output amplifier A2 receives the sensing signal from one of the sensing pixel units, and the processing circuit 120 configures the sensing output amplifier A2 to have a first amplifier gain. The sensing output amplifier A2 receives the sensing signal from the other of the sensing pixel units, and the processing circuit 120 configures the sensing output amplifier to have a second amplifier gain. The gain of the first amplifier is different from the gain of the second amplifier. That is, the amplifier gains of the sense output amplifier A2 in different operating periods are configured to be different.

In detail, in one embodiment, when the a-th row of sensing pixel units are driven to output the sensing signal, the control circuit 124 can control the amplifier gain of the sensing output amplifier A2 by outputting the gain control signal Sa, so as to cause the sensing The sensing output amplifier A2 sequentially amplifies the sensing signals output by the a-th row of sensing pixel units according to the corresponding amplifier gain. For example, during the period when the sensing pixel unit in the ath column is driven to output the sensing signal, the response reading selection device SW1 is turned on, the sensing output amplifier A2 receives the sensing signal of the sensing pixel unit Pa1, and the processing circuit 120 is configured The sense output amplifier A2 has a first amplifier gain. The sensing output amplifier A2 receives the sensing signal of the sensing pixel unit Pa2, and the processing circuit 120 configures the sensing output amplifier A2 to have a second amplifier gain. The gain of the first amplifier is different from the gain of the second amplifier. Therefore, the sensing output amplifier A2 can amplify the sensing signal output by the sensing pixel unit Pa1 according to the first amplifier gain, and the sensing output amplifier A2 can amplify the sensing signal output by the sensing pixel unit Pa2 according to the second amplifier gain. Signal.

Similarly, during the period when the sensing pixel unit in the b-th column is driven to output the sensing signal, the response reading selection device SW1 is turned on, and the sensing output amplifier A2 receives the sensing signal of the sensing pixel unit Pb1, and according to the third amplifier Gain to amplify the sensing signal. The third amplifier gain described above can be configured to be different from the first amplifier gain.

FIG. 6 is an example of a uniform sensing signal output from a sensing pixel array created according to an embodiment of the present invention. Referring to FIG. 6, when the ambient light source conditions are the same and the amplifier gains corresponding to all the sensing pixel units on the sensing pixel array 110 are all the same, the R2 column of the sensing pixel array 110 in the fingerprint sensing device 100 senses The sensing signal output by the pixel unit will be inconsistent (as shown by the curve L1). Correspondingly, if the amplifier gain corresponding to each sensing pixel unit is configured according to the content disclosed in this embodiment, under the same environmental light source conditions, a row of sensing pixel units R2 of the sensing pixel array 110 in the fingerprint sensor device 100 The output sensing signal will tend to be the same (as shown by curve L2). In this example, the amplifier gains corresponding to the sensing pixel units located on both sides of the periphery of the sensing pixel units in the R2 row will be configured to be greater than those corresponding to the sensing pixel units located in the central area of the sensing pixel units in the R2 row The amplifier gain. Based on this, based on the configured amplifier gain, the image quality of the fingerprint image generated by the inventive embodiment of the present invention can be improved.

FIG. 7 is a schematic diagram of generating a fingerprint image according to the internal sensing pixels of each sensing block according to an embodiment of the present invention. Referring to FIG. 7, in one embodiment, the sensing pixel array 110 can be divided into a plurality of sensing blocks (for example, sensing blocks Z1 and Z2) of the same size. Each sensing block may include a plurality of sensing pixel units. Here, K*K sensing pixel units are taken as an example. The gain parameter may include the number of superimposed pixels corresponding to each sensing block. The processing circuit 120 can respectively accumulate the sensing signals of some or all of the sensing pixel units in the sensing block according to the number of superimposed pixels to generate the image pixels of the fingerprint image Img_f2.

As shown in FIG. 7, in one embodiment, the processing circuit 120 can take the sensing signals of R sensing pixel units from the sensing block Z1 (ie, the first sensing block) to generate an image of the fingerprint image Img_f2 Pixel Px1. That is, the number of superimposed pixels corresponding to the sensing block Z1 is R. The processing circuit 120 takes the sensing signals of S sensing pixel units from the sensing block Z2 (ie, the second sensing block) to generate the image pixels Px2 of the fingerprint image Img_f2. That is, the number of superimposed pixels corresponding to the sensing block Z2 is S. Here, R and S are integers greater than 0 and less than or equal to K*K, and R is not equal to S. For example, in one embodiment, the pixel readout circuit 121 may include an integrator circuit. The integrator circuit can integrate the sensing signals of the R sensing pixel units in the sensing block Z1 to obtain an integrated signal for generating the image pixel Px1. The integrator circuit can perform an integration operation on the sensing signals of the S sensing pixel units in the sensing block Z2 to obtain an integrated signal for generating the image pixel Px2. Based on this, based on the configured number of superimposed pixels, the image quality of the fingerprint image generated by the creative embodiment of the present invention can be improved.

It should be noted that the configured gain parameters can be generated based on the calibration procedure and recorded in the storage device of the processing circuit 120 for use in fingerprint sensing. In one embodiment, the processing circuit 120 initializes the gain parameter during the calibration period and obtains the non-average image according to the sensing signal output by each sensing pixel unit. The processing circuit 120 can configure the gain parameter according to a plurality of image pixels of the non-average image. It should be noted that the gain parameter is configured to be inversely proportional to the pixel value of the image pixel of the non-average image.

For example, after initializing each gain parameter (for example, setting the amplifier of each line amplifier to a preset value or maintaining the amplifier gain of the sensing output amplifier at a preset value), the image signal processing circuit 122 may read out according to the pixels The digital image data output by the circuit 121 obtains non-average images. The image signal processing circuit 122 can perform statistical analysis on the image pixels of the non-average image to configure the gain parameter corresponding to each sensing pixel unit or each sensing block on the sensing pixel array 110 according to the statistical analysis result. In one embodiment, the gain parameter (for example, amplifier gain) corresponding to each sensing pixel unit is configured to be inversely proportional to the pixel value of the image pixel of the non-average image. In other words, the larger the pixel value of the image pixel of the non-average image, the smaller the corresponding gain parameter is configured. In one embodiment, the gain parameter (for example, the number of superimposed pixels) corresponding to each sensing block is configured to correspond to the statistical value (for example, the average value or the sum) of a plurality of pixel values in the corresponding image block of the non-average image Inversely proportional. In other words, the larger the statistical value of the multiple pixel values in the image block, the smaller the corresponding gain parameter is configured.

Alternatively, in one embodiment, the processing circuit 120 initializes the gain parameter during the calibration period, and configures the gain parameter according to the sensing signal output by the sensing pixel unit. It should be noted that the gain parameter is configured to be inversely proportional to the signal level of the sensing signal. For example, after initializing each gain parameter (for example, setting the amplifier of each row amplifier to a preset value or maintaining the amplifier gain of the sensing output amplifier at a preset value), the control circuit 124 may be based on each sensing pixel unit The signal level of the output sensing signal configures the gain parameter. The higher the signal level of the sensing signal output by the sensing pixel unit, the smaller the corresponding gain parameter is configured.

FIG. 8 is a flowchart of a fingerprint sensing method according to an embodiment of the new creation. Please refer to FIG. 8, in step S801, during the calibration period, the processing circuit 120 initializes the gain parameter. In step S802, during the calibration period, the processing circuit 120 controls the sensing pixel array 110 to perform image sensing, and configures the gain parameter associated with each sensing pixel unit or each sensing block according to the sensing result. In step S803, during the fingerprint sensing period, the processing circuit 120 generates a fingerprint image according to the configured gain parameter and the sensing signal output by the sensing pixel array 110.

In summary, in the creative embodiment of the present invention, each image pixel of the fingerprint image is generated based on the configured gain parameter. The gain parameter corresponding to each sensing position on the sensing pixel array will be inversely proportional to the amount of incident light. In this way, the uneven brightness of the fingerprint image can be significantly improved, and the image quality of the fingerprint image is improved, thereby increasing the success rate of fingerprint recognition. In addition, in the application of fingerprint sensing under the screen, the amount of light received by the fingerprint stick sensing array may vary based on the configuration of the illuminating light source, the characteristics of the display panel, the optical characteristics of the optical elements, or the mechanism configuration of the fingerprint sensor. Uniformity, so the advantages of the new creative embodiment can be more prominent.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the new creation, not to limit it; although the new creation is described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the various embodiments of the invention The scope of the technical solution.

100: Fingerprint sensing device 10.110: Sensing pixel array 120: processing circuit 121: Pixel readout circuit 122: video signal processing circuit 123: drive circuit 124: control circuit P1, Pa1, Pa2, Pb1: sensing pixel unit A1_1～A1_P: Line amplifier S1～SP, Sa: gain control signal SW1～SWP: Reading selection device A2: Sensing output amplifier L1, L2: Curve Z1, Z2: sensing block Img_f, Img_f2: fingerprint image Px1, Px2: image pixels S801～S803: steps

FIG. 1 is an example of an image with uneven brightness generated by an image sensor of a fingerprint sensor device. Fig. 2 is a schematic diagram of an optical fingerprint sensing device according to an embodiment of the invention. Fig. 3 is a schematic diagram of an optical fingerprint sensing device according to an embodiment of the invention. Fig. 4 is a schematic diagram of the amplifier gain of the configured line amplifier according to an embodiment of the invention. FIG. 5 is a schematic diagram of the amplifier gain of the configured sensing output amplifier according to an embodiment of the present invention. FIG. 6 is an example of a sensor pixel array outputting a uniform sensing signal according to an embodiment of the invention. FIG. 7 is a schematic diagram of generating a fingerprint image according to the internal sensing pixels of each sensing block according to an embodiment of the present invention. FIG. 8 is a flowchart of a fingerprint sensing method according to an embodiment of the new creation.

100: Fingerprint sensing device

110: Sensing pixel array

120: processing circuit

Claims (11)

An optical fingerprint sensing device, including: A sensing pixel array including P*Q sensing pixel units, each of the sensing pixel units correspondingly outputs a sensing signal, where P and Q are integers greater than 0; and A processing circuit, coupled to the sensing pixel array, configuring a plurality of gain parameters, and generating a fingerprint image based on the sensing signal output by each of the sensing pixel units and the gain parameter, the fingerprint image including M* N image pixels, where M is an integer greater than 0 and less than or equal to P, and N is an integer greater than 0 and less than or equal to Q, The image pixels of the fingerprint image are respectively associated with the gain parameters, and the processing circuit configures one of the gain parameters to be different from the other of the gain parameters. The optical fingerprint sensing device according to claim 1, wherein the signal level of the sensing signal output by one of the sensing pixel units is controlled by one of the gain parameters, and the sensing The signal level of the sensing signal output by the other one of the pixel units is controlled by the other one of the gain parameters. The optical fingerprint sensing device according to claim 2, wherein the gain parameter includes amplifier gains of a plurality of line amplifiers, the processing circuit includes a pixel readout circuit, and the pixel readout circuit includes a sensor corresponding to a plurality of lines And each of the row amplifiers of the sensing pixel unit correspondingly amplifies the sensing signal output by each of the plurality of rows of sensing pixel units. The optical fingerprint sensing device according to claim 3, wherein a first row amplifier in the row amplifier receives the sensing signal from one of the sensing pixel units, and the processing circuit configures the first row amplifier One row amplifier has a first amplifier gain; a second row amplifier in the row amplifier receives the sensing signal of the other one of the sensing pixel units, and the processing circuit configures the second row amplifier to have a first Two amplifier gains; and the first amplifier gain is different from the second amplifier gain. The optical fingerprint sensing device according to claim 2, wherein the gain parameter includes an amplifier gain of a sensing output amplifier, the processing circuit includes a pixel readout circuit, and the pixel readout circuit includes a read selection A device and the sensing output amplifier, the read selection device is coupled to the input end of the sensing output amplifier, and the sensing output amplifier sequentially amplifies the sensing signal output by each of the sensing pixel units . The optical fingerprint sensing device according to claim 5, wherein the sensing output amplifier receives the sensing signal from one of the sensing pixel units, and the processing circuit is configured with the sensing output amplifier having A first amplifier gain; the sensing output amplifier receives the sensing signal of the other one of the sensing pixel units, the processing circuit configures the sensing output amplifier to have a second amplifier gain; and the first The gain of one amplifier is different from the gain of the second amplifier. The optical fingerprint sensing device according to claim 1, wherein the sensing pixel array is divided into a plurality of sensing blocks of the same size, and the gain parameter includes a superposition corresponding to each of the sensing blocks According to the number of pixels, the processing circuit respectively accumulates the sensing signals of some or all of the sensing pixel units in the sensing block according to the number of superimposed pixels to generate the image pixels of the fingerprint image. The optical fingerprint sensing device according to claim 7, wherein the sensing block includes a first sensing block and a second sensing block, and the processing circuit is configured from one of the first sensing block One of the image pixels of the fingerprint image is generated by the sensing signal of R sensing pixel units, and the processing circuit takes the sensing of S sensing pixel units from the second sensing block. The other of the image pixels of the fingerprint image generated by the test signal, R is not equal to S. The optical fingerprint sensing device according to claim 1, wherein the gain parameter includes the exposure time of the sensing pixel unit, and one of the sensing pixel units performs sensing and imaging according to the first exposure time, The other one of the sensing pixel units performs sensing and imaging according to a second exposure time, and the first exposure time is different from the second exposure time. The optical fingerprint sensing device according to claim 1, wherein the processing circuit initializes the gain parameter during the calibration period and obtains a non-average image according to the sensing signal output by each sensing pixel unit, so The processing circuit configures the gain parameter according to a plurality of image pixels of the non-average image, and the gain parameter is configured to be inversely proportional to the pixel value of the image pixel of the non-average image. The optical fingerprint sensing device according to claim 1, wherein the processing circuit initializes the gain parameter during calibration, and configures the gain parameter according to the sensing signal output by the sensing pixel unit, so The gain parameter is configured to be inversely proportional to the signal level of the sensing signal.

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