WO2020097807A1 - 一种屏下光学指纹感测装置及感测方法 - Google Patents
一种屏下光学指纹感测装置及感测方法 Download PDFInfo
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- WO2020097807A1 WO2020097807A1 PCT/CN2018/115323 CN2018115323W WO2020097807A1 WO 2020097807 A1 WO2020097807 A1 WO 2020097807A1 CN 2018115323 W CN2018115323 W CN 2018115323W WO 2020097807 A1 WO2020097807 A1 WO 2020097807A1
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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
Definitions
- the invention relates to an optical fingerprint sensing device, in particular to an under-screen optical fingerprint sensing device.
- the effective optical sensing area of the optical fingerprint sensing device under the screen is small, and the finger is easy to deviate, and there cannot be enough fingerprint feature points for fingerprint recognition, resulting in a poor user experience.
- the current under-screen optical fingerprint sensing device needs further improvement and innovation.
- One of the objectives of the present invention is to disclose an under-screen optical fingerprint sensing device and method to solve the above problems.
- the under-screen optical fingerprint sensing device includes an optical fingerprint sensing unit, a first scanning sensing circuit and a second scanning sensing circuit; wherein the optical fingerprint sensing unit includes multiple sensing areas for An exposure and a second exposure to obtain a first sensing result and a second sensing result of the plurality of sensing areas, respectively; wherein the exposure time of the first exposure is shorter than the second exposure; the first A scanning sensing circuit is connected to the plurality of sensing areas to obtain a first sensing result of each sensing area, and a weighting result is generated accordingly; the second scanning sensing circuit is connected to the The plurality of sensing areas sequentially output the second sensing results of at least one sensing area among the plurality of sensing areas according to the weighting result.
- the under-screen optical fingerprint sensing device disclosed in the present application has multiple sensing areas, cooperates with the first scanning sensing circuit to first evaluate the weighting result of each first sensing result, and then the second scanning sensing circuit bases on The weighting result sequentially outputs the second sensing result of at least one sensing area of the plurality of sensing areas; thus, the second scanning sensing circuit does not have to output the sensing results of all sensing areas to effectively reduce the data
- the amount of transmission relatively reduces the space for storing data, and at the same time solves the defects of the current off-screen optical fingerprint sensing device and the slow fingerprint recognition speed.
- the sensing method includes the steps of: first exposing the plurality of sensing areas to obtain a first sensing result of each sensing area; generating a first sensing result of each sensing area to generate A weighting result; performing a second exposure on the plurality of sensing areas to obtain a second sensing result for each sensing area; wherein the exposure time of the first exposure is shorter than the second exposure; and the basis
- the weighting result is used to sequentially output the second sensing result of at least one sensing area of the plurality of sensing areas.
- the sensing method of the off-screen optical fingerprint sensing device disclosed in this application first evaluates the weighting result of each first sensing result, and then according to the weighting result, in order The second sensing result of at least one sensing area of the plurality of sensing areas is output; therefore, the sensing method of the present application can effectively reduce the amount of data transmission, and also relatively reduce the space for storing data, while solving the current screen
- the optical fingerprint sensing device has defects such as bias and slow fingerprint recognition speed.
- a handheld device including: a display screen; and an off-screen optical fingerprint sensing device, which is disposed under the display screen, and includes: an optical fingerprint sensing unit, including multiple Sensing areas for performing the first exposure and the second exposure to obtain the first sensing result and the second sensing result of the plurality of sensing areas, respectively, wherein the exposure time of the first exposure is shorter than The second exposure; a first scanning sensing circuit connected to the plurality of sensing areas to obtain the first sensing result of each sensing area, and accordingly generating a weighting result; and a second A scanning sensing circuit connected to the plurality of sensing areas, and the second scanning sensing circuit sequentially outputs the second sense of at least one sensing area among the plurality of sensing areas according to the weighting result ⁇ ⁇ Test results.
- an optical fingerprint sensing unit including multiple Sensing areas for performing the first exposure and the second exposure to obtain the first sensing result and the second sensing result of the plurality of sensing areas, respectively, wherein the exposure time of the first exposure is shorter than
- the under-screen optical fingerprint sensing device of the handheld device disclosed in the present application has a plurality of sensing areas, cooperates with the first scanning sensing circuit to first evaluate the weighting result of each first sensing result, and then senses by the second scanning
- the circuit sequentially outputs the second sensing results of at least one sensing area of the plurality of sensing areas according to the weighting results; thus, the second scanning sensing circuit does not have to output the sensing results of all sensing areas to effectively Reduce the amount of data transmission, relatively reduce the space for storing data, and at the same time solve the defects of the off-screen optical fingerprint sensing device of the handheld device and the slow fingerprint recognition speed.
- FIG. 1A is a schematic diagram of the appearance of an off-screen optical fingerprint sensing device applied to a handheld device.
- FIG. 1B is a schematic diagram of the display screen and the under-screen optical fingerprint sensing device of the present application.
- FIG. 2 is a functional block diagram of an optical fingerprint sensing device under the screen of the present application.
- FIG. 3A is a schematic top plan view of the first embodiment of the optical fingerprint sensing unit.
- FIG. 3B is a schematic top plan view of the second embodiment of the optical fingerprint sensing unit.
- FIG. 4 is a functional block diagram of the first scan sensing circuit of this application.
- FIG. 5 is a flowchart of obtaining preset calibration images of a plurality of sensing areas of an optical fingerprint sensing unit in this application.
- FIG. 6 is a flowchart of consistency correction of each first sensing result in this application.
- FIG. 7 is a flowchart of a sensing method of an optical fingerprint sensing device under the screen of this application.
- the under-screen optical fingerprint sensing device and sensing method of the present application have a larger effective optical sensing area, but the fingerprint recognition speed is not slowed down due to the increase in the amount of sensing data.
- the following cooperates with multiple embodiments and figures The detailed description of the technical content of the display screen of this application.
- the under-screen optical fingerprint sensing device 20 of the present application is applied to a handheld device 1, and the under-screen optical fingerprint sensing device 20 is disposed under a display screen 10 of the handheld device 1 .
- the display screen 10 includes a display panel 11 and a protective cover 12.
- the display panel 11 has a first side 111 and a second side 112 opposite to the first side 111.
- the protective cover 12 is disposed on the second side of the display panel 11 Side 112, and the under-screen optical fingerprint sensing device 20 is disposed on the first side 111 of the display panel 11 so that the display panel 11 is located between the under-screen optical fingerprint sensing device 20 and the protective cover 12
- the under-screen optical fingerprint sensing device 20 includes an optical fingerprint sensing unit 21, a first scanning sensing circuit 22 and a second scanning sensing circuit 23; wherein the optical fingerprint sensing unit 21 Including a plurality of sensing areas 210 for performing a first exposure and a second exposure to obtain the first sensing results and the second sensing results of the plurality of sensing areas 210 respectively; wherein the exposure of the first exposure The time is shorter than the second exposure.
- the area of the optical fingerprint sensing unit 21 may be larger than the area of a general fingerprint to increase user convenience. In this embodiment, the area of the optical fingerprint sensing unit 21 may cover a part of the display screen 10 of the handheld device 1 or All, this disclosure does not make too many restrictions.
- the plurality of sensing regions 210 included in the optical fingerprint sensing unit 21 may be arranged in a manner of M * N, where M or N is an integer greater than or equal to 1, and M * N is greater than 1.
- FIG. 3A is a configuration of an optical fingerprint sensing unit.
- the optical fingerprint sensing unit 21 in FIG. 3A includes four sensing regions 210 arranged in a 1 * 4 manner.
- FIG. 3B is another configuration of the optical fingerprint sensing unit.
- the optical fingerprint sensing unit 21a in FIG. 3A includes four sensing regions 210 arranged in a 2 * 2 manner.
- the optical fingerprint sensing unit 21 or 21a may be a single sensor whose sensing area is virtually divided into the plurality of sensing areas 210; for example, the optical fingerprint sensing unit 21 is a strip-shaped sensor, which uses a tile division method to virtually divide the 1 * 4 sensing area; the optical fingerprint sensing unit 21a is a square sensor, which uses a brick division method to virtually divide 2 * 2 Sensing area.
- the optical fingerprint sensing unit 21 or 21a may be composed of a plurality of independent sensors, each independent sensor corresponds to a sensing area 210, and a plurality of independent sensors are combined to form The optical fingerprint sensing unit 21 or 21a shown in FIG. 3A or 3B. Whether the optical fingerprint sensing units 21 and 21a shown in FIG. 3A or FIG. 3B are known, the optical fingerprint sensing unit has a larger effective optical sensing area.
- the first scanning sensing circuit 22 is connected to a plurality of sensing regions 210. After the first sensing regions 210 perform the first exposure, the first scanning sensing circuit 22 can obtain each sensing region The first sensing result of 210 is used to generate a weighting result.
- the first scan sensing circuit 22 may include a consistency correction unit 221, a low-pass filter 222, and a weight result evaluation unit 223. Please note that in addition to the weight result evaluation unit 223, the consistency correction unit 221 and / or low-pass filter 222 may be omitted as appropriate.
- the consistency correction unit 221 After the first scanning sensing circuit 22 obtains the first sensing result 211 of each sensing area 210, the consistency correction unit 221 first performs consistency correction on each first sensing result 211, and then passes the low The pass filter 222 performs a low-pass filtering process on the first sensing result after the consistency correction to obtain the first sensing result.
- FIG. 4 illustrates the results obtained by the two sensing regions 210 after being processed by the consistency correction unit 221 and the low-pass filter 222, which are the first sensing result 211a and 211a, respectively.
- the second sensing result 211b The second sensing result 211b.
- multiple sensing areas 210 may have shading effects, and there may also be differences between the multiple sensing areas 210 due to the manufacturing process, even if exposure is performed in the same environment at the same time, corresponding to multiple The plurality of first sensing results in the sensing area 210 may not be completely the same, or even have considerable errors; therefore, the weighting result evaluation unit 223 is performed on the plurality of first sensing results in the plurality of sensing areas 210 Before, it is preferable to use the consistency correction unit 221 to perform consistency correction on the plurality of first sensing results of the plurality of sensing areas 210, as shown in FIG. 4.
- a preset correction image (or referred to as a preset correction table) 214 is required, and each sensing The area 210 has a corresponding preset calibration image 214.
- a preset correction image or referred to as a preset correction table
- the preset corrected image 214 is generated by first filtering the first sensing result 211 to obtain an image 212, and then calculating a compensation gain (gain) 213 to correct the shadow effect, and / or correction
- the brightness reference of each sensing area 210 enables each sensing area 210 to obtain a similar brightness value under the same brightness condition after undergoing compensation gain.
- the compensation gain 213 can be further compressed into a preset calibration image 214 of a smaller size to avoid occupying too much storage space.
- the consistency correction unit 221 when the consistency correction unit 221 performs consistency correction on each first sensing result 211, it first compresses and restores the preset corrected image 214 so that it becomes the same as the first sensing result 211 A compensation gain 213 of a size of ⁇ , and calculating each first sensing result 211 and the corresponding compensation gain 213 to obtain a compensated first sensing result 211 ′.
- the weighting result evaluation unit 223 evaluates the weighting result for each first sensing result after low-pass filtering.
- the brightness of the first sensing result 220a is A sensing result 220b is more average and the average brightness is darker.
- the first sensing result 220a shows no light leakage or low light leakage, which means that all or nearly all of its corresponding sensing areas 210 are fingered.
- the object 40 is pressed, and the brightness of the first sensing result 220b is less average than the first sensing result 220a, and the average brightness is darker.
- the first sensing result 220b shows a light leakage phenomenon or a high degree of light leakage , Representing that the corresponding sensing area 210 is only partially pressed by the finger object 40. Therefore, for the finger object 40 currently being pressed, the sensing area 210 corresponding to the first light leakage-free sensing result 211a contains the most effective fingerprint information, and the sensing corresponding to the first light leakage-sensing result 211b The area 210 contains relatively little effective fingerprint information; in summary, in order to distinguish among the plurality of sensing areas 210 which are currently pressed by the finger object 40 with the largest area, the low-pass filtering may be used The brightness of each first sensing result is processed to evaluate its weighting result.
- the weight result evaluation unit 223 evaluates the weight result by estimating the average brightness value of the first sensing result corresponding to each sensing area. The higher the average brightness value, the corresponding sensing The lower the regional weight.
- this disclosure is not limited to this, and other data can also be used or referred to as the weighting result evaluation method. For example, when the difference between the average brightness values is not large, the highest brightness value and the lowest brightness value of the first sensing result corresponding to each sensing area are estimated. The larger the difference, the lower the weight. For another example, the greater the proportion of the area where the brightness value of the first sensing result is higher than a threshold value, the lower the weight. As shown in FIG.
- the weighting result of the first sensing result 211a is given a score (1023) higher than the score (46) of the first sensing result 211b; the data representing the weighting results presented here are for illustrative purposes only and are not limited Representation of the result of a specific weight.
- the second scan sensing circuit 23 is connected to the plurality of sensing regions 210 and the first scan sensing circuit 22.
- the second scan sensing circuit 23 is based on the weight generated by the first scan sensing circuit 22 As a result, it is decided to output some or all of the plurality of second sensing results of the plurality of sensing regions 210 after the second exposure to the fingerprint recognition unit 30. More importantly, the second scanning sensing circuit 23 will The priority order of outputting the partial or all second sensing results to the fingerprint recognition unit 30 is determined according to the weighting results. In the embodiment shown in FIG. 4, the output order is determined by the high-to-low score of the weighting result. As shown in FIG.
- the finger object 40 is pressed all the way from the left to the third sensing area, and part of the pressure is pressed from the left
- the second and fourth sensing areas are counted from the right, and the second sensing area has a larger pressing area; therefore, the first scanning sensing circuit 22 evaluates the weights of the four sensing areas
- the score of the result from high to low is: the third sensing area, the second sensing area, and the fourth sensing area, of which the first sensing area has no weighting result score.
- the second scanning sensing circuit 23 will sequentially transmit the second sensing results of the third sensing area, the second sensing area, and the fourth sensing area to the fingerprint recognition unit 30, and the fingerprint recognition unit After receiving 30, fingerprint identification is performed; thus, the under-screen optical fingerprint sensing device 20 does not need to transmit the second sensing results of all sensing areas 210 to the fingerprint identification unit 30.
- the second scan sensing circuit 23 transmits the second sensing result of the third sensing area to the fingerprint recognition unit 30, if the fingerprint recognition unit 30 indicates that the recognition is completed, the second scan sensing The circuit 23 no longer receives the second sensing result of the remaining sensing area; otherwise, if the fingerprint recognition unit 30 indicates that it cannot be recognized, the second scanning sensing circuit 23 receives the second sensing of the second sensing area The result is transmitted to the fingerprint recognition unit 30 until the fingerprint recognition unit 30 indicates that the recognition is successful.
- the sensing method of the under-screen optical fingerprint sensing device of the present invention first exposes the plurality of sensing regions to obtain the first sensing result of each sensing region, and then According to the first sensing result of each sensing area, a weighting result S11 is generated; then, the plurality of sensing areas are subjected to a second exposure to obtain a second sensing result of each sensing area; wherein The exposure time of the first exposure is shorter than the second exposure S12; finally, the second sensing result S13 of at least one sensing area of the plurality of sensing areas is sequentially output according to the weighting result.
- the exposure time of the second exposure is about three times the exposure time of the first exposure.
- the sensing method of the off-screen optical fingerprint sensing device disclosed in this application first evaluates the weighting result of each first sensing result, Then, according to the weighting result, the second sensing result of at least one sensing area of the plurality of sensing areas is sequentially output; therefore, the sensing method of the present application can effectively reduce the transmission of the amount of data and also relatively reduce the amount of stored data At the same time, it solves the defects of the current off-screen optical fingerprint sensing device's bias and slow fingerprint recognition speed.
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Abstract
一种屏下光学指纹感测装置及感测方法。所述屏下光学指纹感测装置（20）包括一光学指纹感测单元（21）、一第一扫描感测电路（22）及一第二扫描感测电路（23）；其中光学指纹感测单元（21）包括多个感测区域（210），用来进行第一曝光以及第二曝光以分别得到所述多个感测区域（210）的第一感测结果以及第二感测结果；所述第一曝光的曝光时间短于所述第二曝光；所述第一扫描感测电路（22）获得所述每一感测区域（210）的第一感测结果，并据以产生一权重结果；所述第二扫描感测电路（23）依据所述权重结果来依序输出所述多个感测区域（210）中的至少一感测区域（210）的第二感测结果；如此，第二扫描感测电路（23）不必输出全部感测区域的感测结果，以有效减少资料量的传输，相对减少储存资料的空间。
Description
本发明涉及具光学指纹感测装置，尤其涉及一种屏下光学指纹感测装置。
目前屏下光学指纹感测装置的有效光学感测面积小，手指容易按偏，而无法有足够的指纹特征点进行指纹辨识，造成使用体验不佳。
若使用更大的有效光学感测面积的屏下光学指纹感测装置，相对增加感测资料量，在有限的传输频宽下，资料传输速度慢，辨识指纹特征的速度也变慢，还是会造成另一种使用体验不佳的情况。
因此，目前屏下光学指纹感测装置需要进一步改良及创新。
发明内容
本发明的目的之一在于公开一种屏下光学指纹感测装置及感测方法，来解决上述问题。
本申请的一实施例公开了一种屏下光学指纹感测装置。所述屏下光学指纹感测装置包括一光学指纹感测单元、一第一扫描感测电路及一第二扫描感测电路；其中光学指纹感测单元包括多个感测区域，用来进行第一曝光以及第二曝光以分别得到所述多个感测区域的第一感测结果以及第二感测结果；其中所述第一曝光的曝光时间短于所述第二曝光；所述第一扫描感测电路连接至所述多个感测区域，以获得所述每一感测区域的第一感测结果，并据以产生一权重结果；所述第二扫描感测电路连接至所述多个感测区域，依据所述权重结果来依序 输出所述多个感测区域中的至少一感测区域的第二感测结果。
本申请所公开的屏下光学指纹感测装置具有多个感测区域，配合第一扫描感测电路先对每一第一感测结果进行权重结果的评估，再由第二扫描感测电路依据权重结果，依序输出所述多个感测区域中的至少一感测区域的第二感测结果；如此，第二扫描感测电路不必输出全部感测区域的感测结果，以有效减少资料量的传输，相对减少储存资料的空间，同时解决目前屏下光学指纹感测装置按偏及指纹辨识速度慢等缺陷。
本申请的另一实施例公开了一种屏下光学指纹感测装置的感测方法。所述感测方法包括以下步骤：使所述多个感测区域进行第一曝光，以获得每一感测区域的第一感测结果；依据每一感测区域的第一感测结果，产生一权重结果；使所述多个感测区域进行第二曝光，以获得每一感测区域的第二感测结果；其中所述第一曝光的曝光时间短于所述第二曝光；以及依据所述权重结果来依序输出所述多个感测区域中的至少一感测区域的第二感测结果。
本申请所公开屏下光学指纹感测装置的感测方法在获得每一感测区域的第一感测结果后，先评估每一第一感测结果的权重结果，再依据权重结果，依序输出所述多个感测区域中的至少一感测区域的第二感测结果；因此，本申请感测方法可有效减少资料量的传输，也相对减少储存资料的空间，同时解决目前屏下光学指纹感测装置按偏及指纹辨识速度慢等缺陷。
本申请的另一实施例公开了一种手持装置，包括：一显示屏；以及一屏下光学指纹感测装置，设置在所述显示屏下，并包括：一光学指纹感测单元，包括多个感测区域，用来进行第一曝光以及第二曝光以分别得到所述多个感测区域的第一感测结果以及第二感测结果，其中所述第一曝光的曝光时间短于所述第二曝光；一第一扫描感测电路，连接至所述多个感测区域以获得所述每一感测区域的第一感测结果，并据以产生一权重结果；以及一第二扫描感测电路，连接至所述多个感测区域，所述第二扫描感测电路依据所述权重结果来依序输出所述 多个感测区域中的至少一感测区域的第二感测结果。
本申请所公开手持装置的屏下光学指纹感测装置具有多个感测区域，配合第一扫描感测电路先对每一第一感测结果进行权重结果的评估，再由第二扫描感测电路依据权重结果，依序输出所述多个感测区域中的至少一感测区域的第二感测结果；如此，第二扫描感测电路不必输出全部感测区域的感测结果，以有效减少资料量的传输，相对减少储存资料的空间，同时解决目前手持装置的屏下光学指纹感测装置按偏及指纹辨识速度慢等缺陷。
图1A是本申请屏下光学指纹感测装置应用于一手持装置的外观示意图。
图1B是本申请显示屏和的屏下光学指纹感测装置的示意图。
图2是本申请屏下光学指纹感测装置的功能方块图。
图3A是光学指纹感测单元的第一实施例的上视平面示意图。
图3B是光学指纹感测单元的第二实施例的上视平面示意图。
图4本申请第一扫描感测电路的功能方块图。
图5本申请得到光学指纹感测单元的多个感测区域的预设校正影像的流程图。
图6本申请对每一第一感测结果进行一致性校正的流程图。
图7本申请屏下光学指纹感测装置的感测方法的流程图。
其中，附图标记说明如下：
1 手持装置
10 显示屏
11 显示面板
111 第一侧
112 第二侧
12 保护盖板
20 屏下光学指纹感测装置
21 光学指纹感测单元
210 感测区域
211 第一感测结果
211' 一致性校正后的第一感测结果
211a、211b 低通滤波器后的第一感测结果
212 低通滤波器后的影像
213 补偿增益影像
214 预设校正影像
22 第一扫描感测电路
221 一致性校正单元
222 低通滤波器
223 权重结果评估单元
23 第二扫描感测电路
30 指纹辨识单元
40 对象
在说明书及的前的权利要求书当中使用了某些词汇来指称特定的组件。本领域的技术人员应可理解，制造商可能会用不同的名词来称呼同样的组件。本说明书及的前的权利要求书并不以名称的差异来作为区分组件的方式，而是以组件在功能上的差异来作为区分的基准。在通篇说明书及的前的权利要求书当中所提及的“包括”为一开放式 的用语，故应解释成“包括但不限定于”。
本申请的屏下光学指纹感测装置及其感测方法，具有较大有效的光学感测面积，但不因感测资料量变大而造成指纹辨识速度减慢，以下配合多个实施例及图式，详细说明本申请显示屏的技术内容。
首先请参阅图1A及图1B所示，本申请屏下光学指纹感测装置20应用于一手持装置1中，一屏下光学指纹感测装置20设置在手持装置1的一显示屏10之下。显示屏10包括一显示面板11以及一保护盖板12，显示面板11具有一第一侧111和相对于第一侧111的一第二侧112，保护盖板12设置于显示面板11的第二侧112，且屏下光学指纹感测装置20设置于显示面板11的第一侧111，使显示面板11位于屏下光学指纹感测装置20和保护盖板12之间
请配合参阅图2所示，屏下光学指纹感测装置20包括有一光学指纹感测单元21、一第一扫描感测电路22及一第二扫描感测电路23；其中光学指纹感测单元21包括多个感测区域210，用来进行第一曝光以及第二曝光以分别得到所述多个感测区域210的第一感测结果以及第二感测结果；其中所述第一曝光的曝光时间短于所述第二曝光。光学指纹感测单元21的面积可大于一般指纹的面积，以增添使用者的方便性，本实施例中，光学指纹感测单元21的面积可以涵盖手持装置1的显示屏10的一部份或全部，本揭露不多做限制。
在本揭露中，光学指纹感测单元21所包含的多个感测区域210可以是以M*N的方式排列，其中M或N为大于等于1的整数，且M*N大于1。图3A为光学指纹感测单元的一种组态，图3A中的光学指纹感测单元21包含四个感测区域210以1*4的方式排列。图3B为光学指纹感测单元的另一种组态，图3A中的光学指纹感测单元21a包含四个感测区域210以2*2的方式排列。在某些实施例中，光学指纹感测单元21或21a可以是一个单一感测器，其感测区被虚拟地划分为所述多个感测区域210；举例来说，光学指纹感测单元21是长条型感测器，采用砖状(Tile)分割方式虚拟划分出1*4的感测区域；光学指纹感测单元21a是正方型感测器，采用砖状分割方式虚拟划分出 2*2的感测区域。在某些实施例中，，光学指纹感测单元21或21a可以由多个独立的感测器组成，每个独立的感测器对应一个感测区域210，多个独立的感测器并构成图3A或3B所示的光学指纹感测单元21或21a。无论是图3A或图3B所示的光学指纹感测单元21、21a均习知的光学指纹感测单元具有更大的有效的光学感测面积。
再如图2所示，第一扫描感测电路22连接至多个感测区域210，当多个感测区域210进行第一曝光后，第一扫描感测电路22即可获得每一感测区域210的第一感测结果，并据以产生一权重结果。请配合图4所示，第一扫描感测电路22可包括一致性校正单元221、低通滤波器222及权重结果评估单元223，请注意，除了权重结果评估单元223之外，一致性校正单元221及/或低通滤波器222可视情况省略。当第一扫描感测电路22获得每一感测区域210的第一感测结果211后，会由一致性校正单元221先将每一第一感测结果211进行一致性校正后，再通过低通滤波器222对一致性校正后的第一感测结果进行低通滤波处理以得到第一感测结果。举例来说，图4中绘示了两个感测区域210所得到的感测结果经过一致性校正单元221和低通滤波器222处理后所得到的结果，分别为第一感测结果211a和第二感测结果211b。
由于多个感测区域210可能存在阴影阴影效应(shading effect)，且多个感测区域210之间亦可能存在因制程所造成的差异，纵使在相同环境下进行相同时间的曝光，对应多个感测区域210的多个第一感测结果之间仍可能非完全相同，甚至有可观的误差；因此，在对多个感测区域210的多个第一感测结果进行权重结果评估单元223之前，较佳地可利用一致性校正单元221先对多个感测区域210的多个第一感测结果进行一致性校正，如图4所示。
再请配合参阅图5所示，以对上述一致性校正进行更进一步的说明。上述一致性校正单元221在对多个感测区域210的多个第一感测结果进行一致性校正时，需要一预设校正影像(或称为预设校正表)214，且每个感测区域210都有对应的预设校正影像214。举例来 说，在屏下光学指纹感测装置20出厂前，会先对每一第一感测结果211进行图5的处理，以获得预设校正影像214。具体来说，预设校正影像214的产生是先将第一感测结果211经过低通滤波处理后得到一影像212，再计算出一补偿增益(gain)213以校正阴影效应，及/或校正每个感测区域210的亮度基准，使每个感测区域210经过补偿增益后，在同样的亮度情况可以得到类似的亮度值。补偿增益213可进一步压缩为较小尺寸的预设校正影像214，避免占据过多储存空间。
参阅图6所示，一致性校正单元221在对每一第一感测结果211进行一致性校正时，会先将预设校正影像214的压缩还原，使其成为和第一感测结果211一样的尺寸的补偿增益213，并将每一第一感测结果211和对应的补偿增益213进行运算，以得到补偿后的第一感测结果211'。
接着，回到图4，再由权重结果评估单元223对经过低通滤波处理的每一第一感测结果进行权重结果的评估，于本实施例中，第一感测结果220a的亮度相对第一感测结果220b来说较为平均，且平均亮度较暗，换句话说，第一感测结果220a显示无漏光现象或漏光程度低，代表其对应的感测区域210全部或接近全部都被手指对象40按压，而第一感测结果220b的亮度相对第一感测结果220a来说较不平均，且平均亮度较暗，换句话说，第一感测结果220b显示有漏光现象或漏光程度高，代表其对应的感测区域210仅有部分被手指对象40按压。因此，就目前按压中的手指对象40来说，无漏光的第一感测结果211a所对应的感测区域210包含最多有效的指纹资讯，有漏光的第一感测结果211b所对应的感测区域210包含相对较少的有效指纹资讯；综上所述，为了在多个感测区域210中区分出被目前手指对象40按压面积最大的其中几个感测区域210，可依据经过低通滤波处理的每一第一感测结果的亮度来评估其权重结果。
于本实施例中，权重结果评估单元223的权重结果评估方式是估算对应所述每一感测区域的第一感测结果的平均亮度值，所述平均亮度值越高，则对应的感测区域权重越低。然本揭露不以此限，亦可使 用或一并参酌其他数据来作为权重结果评估方式。例如，在平均亮度值差距不大的情况下，估算对应所述每一感测区域的第一感测结果最高亮度值和最低亮度值，差距越大则权重越低。再例如，所述第一感测结果的亮度值高于一临界值的面积比例越大，则权重越低。如图4所示，第一感测结果211a的权重结果给分(1023)高于第一感测结果211b的分数(46)；在此所提出表示权重结果的数据只是示意用，并不限定特定权重结果的表示方式。
再如图2所示，第二扫描感测电路23连接至多个感测区域210及第一扫描感测电路22，第二扫描感测电路23会依据第一扫描感测电路22所产生的权重结果，来决定将多个感测区域210经过第二次曝光后的多个第二感测结果中的部分或全部输出至指纹辨识单元30，更重要的是，第二扫描感测电路23会依据所述权重结果来决定所述部分或全部的第二感测结果输出至指纹辨识单元30的优先顺序。以图4所示的实施例，由权重结果的分数高至低决定输出顺序，配合图3A所示，手指对象40全部按压由左自右数来第3个感测区域，部分按压由左自右数来第2个及第4个感测区域，其中又以第2个感测区域的按压面积较大；因此，所述第一扫描感测电路22会评估此四个感测区域的权重结果的分数由高至低为：第3个感测区域、第2个感测区域、第4个感测区域，其中第1个感测区域没有权重结果的分数。
因此，第二扫描感测电路23会依序将第3个感测区域、第2个感测区域、第4个感测区域的第二感测结果传送至指纹辨识单元30，由指纹辨识单元30接收后进行指纹辨识；如此，屏下光学指纹感测装置20即不必传送所有感测区域210的第二感测结果至指纹辨识单元30。在某些实施例中，第二扫描感测电路23将第3个感测区域的第二感测结果传送至指纹辨识单元30后，若指纹辨识单元30表示已辨识完成，第二扫描感测电路23便不再接收剩余的感测区域的第二感测结果；反之，若指纹辨识单元30表示无法辨识，第二扫描感测电路23便再接收第2个感测区域的第二感测结果并传送至指纹辨识单元30，直到指纹辨识单元30指示辨识成功。
由上述说明配合图7可知，本发明屏下光学指纹感测装置的感测方法首先使所述多个感测区域进行第一曝光，以获得每一感测区域的第一感测结果，再依据每一感测区域的第一感测结果，产生一权重结果S11；接着，使所述多个感测区域进行第二曝光，以获得每一感测区域的第二感测结果；其中所述第一曝光的曝光时间短于所述第二曝光S12；最后依据所述权重结果来依序输出所述多个感测区域中的至少一感测区域的第二感测结果S13。在本实施例中，所述第二曝光的曝光时间约为所述第一曝光的曝光时间的三倍。
综上所述，本申请公开的一种屏下光学指纹感测装置的感测方法在获得每一感测区域的第一感测结果后，先评估每一第一感测结果的权重结果，再依据权重结果，依序输出所述多个感测区域中的至少一感测区域的第二感测结果；因此，本申请感测方法可有效减少资料量的传输，也相对减少储存资料的空间，同时解决目前屏下光学指纹感测装置按偏及指纹辨识速度慢等缺陷。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则的内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
Claims (20)
- 一种屏下光学指纹感测装置，其特征在于，包括：一光学指纹感测单元，包括多个感测区域，用来进行第一曝光以及第二曝光以分别得到所述多个感测区域的第一感测结果以及第二感测结果，其中所述第一曝光的曝光时间短于所述第二曝光；一第一扫描感测电路，连接至所述多个感测区域以获得所述每一感测区域的第一感测结果，并据以产生一权重结果；以及一第二扫描感测电路，连接至所述多个感测区域，所述第二扫描感测电路依据所述权重结果来依序输出所述多个感测区域中的至少一感测区域的第二感测结果。
- 如权利要求1所述的屏下光学指纹感测装置，进一步包括指纹辨识单元，用来依据依序输出的所述多个感测区域中的至少一感测区域的第二感测结果来进行指纹辨识。
- 如权利要求1所述的屏下光学指纹感测装置，其中所述光学指纹感测单元是单一感测器，并被虚拟地划分为所述多个感测区域。
- 如权利要求1所述的屏下光学指纹感测装置，其中所述光学指纹感测单元的所述多个感测区域分别为多个独立的感测器。
- 如权利要求1所述的屏下光学指纹感测装置，多个感测区域是以M*N的方式排列，其中M或N为大于等于1的整数，且M*N大于1。
- 如权利要求1所述的屏下光学指纹感测装置，所述第一扫描感测电路包括一致性校正单元，用来对所述每一感测区域的第一感测结果进行一致性校正。
- 如权利要求6所述的屏下光学指纹感测装置，所述一致性校正包括阴影校正(shading correction)。
- 如权利要求7所述的屏下光学指纹感测装置，所述一致性校正单元依据一预设校正表来对所述每一感测区域的第一感测结果分别进行所述阴影校正。
- 如权利要求1所述的屏下光学指纹感测装置，所述第一扫描感测电路包括一低通滤波器，用来对所述每一感测区域的第一感测结果进行低通滤波处理。
- 如权利要求1所述的屏下光学指纹感测装置，所述第一扫描感测电路依据所述每一感测区域的第一感测结果的亮度产生所述权重结果。
- 一种屏下光学指纹感测装置的感测方法，所述屏下光学指纹感测装置包括具有多个感测区域的光学指纹感测单元，其特征在于，包括以下步骤：使所述多个感测区域进行第一曝光，以获得每一感测区域的第一感测结果；依据每一感测区域的第一感测结果，产生一权重结果；使所述多个感测区域进行第二曝光，以获得每一感测区域的第二感测结果；其中所述第一曝光的曝光时间短于所述第二曝光；以及依据所述权重结果来依序输出所述多个感测区域中的至少一感测区域的第二感测结果。
- 如权利要求11所述的感测方法，于所述进行第一曝光的步骤中，对所述每一第一感测结果进行一致性校正。
- 如权利要求12所述的感测方法，所述一致性校正包括阴影校正(shading correction)。
- 如权利要求13所述的感测方法，所述一致性校正单元依据一预设校正表来对所述每一感测区域的第一感测结果分别进行所述阴影校正。
- 如权利要求11所述的感测方法，于所述进行第一曝光的步骤中，对所述每一感测区域的第一感测结果进行低通滤波处理。
- 如权利要求11所述的感测方法，于所述产生权重结果步骤中，所述权重结果是依据所述每一感测区域的第一感测结果的亮度所 产生。
- 如权利要求11所述的感测方法，所述第二曝光的曝光时间约为所述第一曝光的曝光时间的三倍。
- 如权利要求16述的感测方法，所述第一感测结果的平均亮度值越高权重越低。
- 一种手持装置，其特征在于，包括：一显示屏；以及一屏下光学指纹感测装置，设置在所述显示屏下，并包括：一光学指纹感测单元，包括多个感测区域，用来进行第一曝光以及第二曝光以分别得到所述多个感测区域的第一感测结果以及第二感测结果，其中所述第一曝光的曝光时间短于所述第二曝光；一第一扫描感测电路，连接至所述多个感测区域以获得所述每一感测区域的第一感测结果，并据以产生一权重结果；以及一第二扫描感测电路，连接至所述多个感测区域，所述第二扫描感测电路依据所述权重结果来依序输出所述多个感测区域中的至少一感测区域的第二感测结果。
- 如权利要求19的手持装置，其特征在于，所述显示屏包括一显示面板以及一保护盖板，所述显示面板具有一第一侧和相对于所述第一侧的一第二侧，所述保护盖板设置于所述显示面板的第二侧，且所述屏下光学指纹感测装置设置于所述显示面板的第一侧，使所述显示面板位于所述屏下光学指纹感测装置和所述保护盖板之间。
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| US20180189540A1 (en) * | 2016-12-30 | 2018-07-05 | Eosmem Corporation | Exposure time determination method for image sensing operation |
| CN108304759A (zh) * | 2017-01-11 | 2018-07-20 | 神盾股份有限公司 | 识别手指的方法和电子装置 |
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