WO2018006478A1 - 光学指纹传感器模组 - Google Patents

光学指纹传感器模组 Download PDF

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Publication number
WO2018006478A1
WO2018006478A1 PCT/CN2016/095844 CN2016095844W WO2018006478A1 WO 2018006478 A1 WO2018006478 A1 WO 2018006478A1 CN 2016095844 W CN2016095844 W CN 2016095844W WO 2018006478 A1 WO2018006478 A1 WO 2018006478A1
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WO
WIPO (PCT)
Prior art keywords
light
fingerprint sensor
optical fingerprint
layer
backlight
Prior art date
Application number
PCT/CN2016/095844
Other languages
English (en)
French (fr)
Inventor
凌严
朱虹
Original Assignee
上海箩箕技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海箩箕技术有限公司 filed Critical 上海箩箕技术有限公司
Priority to US15/752,972 priority Critical patent/US20180365469A1/en
Publication of WO2018006478A1 publication Critical patent/WO2018006478A1/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
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms

Definitions

  • the present invention relates to the field of optical fingerprint recognition, and in particular to an optical fingerprint sensor module.
  • Fingerprint imaging recognition technology is a technology that uses an optical fingerprint sensor to collect fingerprint images of the human body and then compares them with existing fingerprint imaging information in the system to determine whether it is correct or not, and thus realizes identity recognition. Due to the convenience of its use and the uniqueness of human fingerprints, fingerprint imaging recognition technology has been widely used in various fields. For example, security inspection departments such as the Public Security Bureau and the Customs, access control systems for buildings, and consumer goods such as personal computers and mobile phones. Fingerprint imaging recognition technology can be realized by various techniques such as optical imaging, capacitive imaging, and ultrasonic imaging. Relatively speaking, optical fingerprint imaging recognition technology has relatively good imaging effect and relatively low equipment cost.
  • the structure of the existing optical fingerprint sensor module needs to be improved, and the performance needs to be improved.
  • the problem solved by the present invention is to provide an optical fingerprint sensor module to optimize the structure of the optical fingerprint sensor module and improve the performance of the optical fingerprint sensor module.
  • the present invention provides an optical fingerprint sensor module, including: an optical fingerprint sensor; a dot backlight; the optical fingerprint sensor has one and only one transparent a light substrate; the first surface of the transparent substrate is directly used for finger fingerprint contact; the second surface of the transparent substrate has a device layer; the device layer has a pixel region; and the pixel region has a plurality of pixels; Each of the pixels has a light transmissive area and a non-transmissive area; the non-transparent area has a photosensitive element; the transparent area enables light to pass through the pixel area of the device layer; the dot backlight Located directly below the pixel area, the dot backlight and the optical fingerprint sensor have a space therebetween, and the light emitted by the dot backlight and the first surface of the transparent substrate are sandwiched The angle is a right angle or close to a right angle.
  • the dot backlight is located under the device layer, and the emitted light of the point backlight passes through the device layer from the light transmissive region and then enters the transparent substrate.
  • one of the pixels further includes a light shielding layer, the photosensitive element is located between the light shielding layer and the light transmissive substrate, and the light shielding layer is located between the photosensitive element and the dot backlight.
  • the point backlight comprises at least one LED light, wherein the light of the LED light is near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light; or
  • the dot backlight includes two or more LED lamps, and the two or more LED lamps are symmetrically distributed directly under the optical fingerprint sensor, and the light of the LED lamp is near ultraviolet light. , purple, blue, green, yellow, red, near-infrared or white.
  • the light-emitting surface of the dot-shaped backlight has a collecting lens on the front side, and the collecting lens can convert the light of the point-shaped backlight into parallel light or near-parallel light, and the point backlight The light enters the concentrating lens first and then enters the optical fingerprint sensor.
  • the surface of the device layer further includes a light anti-reflection layer capable of increasing a ratio of light of the point backlight to the optical fingerprint sensor.
  • the optical fingerprint sensor and the point backlight further comprise a transparent medium layer, and the light emitted by the point backlight enters the transparent medium layer first, and then enters the optical fingerprint. sensor.
  • the lower surface of the transparent dielectric layer is used as a concentrating surface, and the dot backlight
  • the emitted light enters the transparent medium layer from the concentrating surface, and the condensing surface converts light emitted by the point backlight into parallel light or near-parallel light.
  • the lower surface of the transparent medium layer further has a light antireflection layer, and the light antireflection layer can increase the proportion of the light of the point backlight into the transparent medium layer.
  • the transparent medium layer is a glass layer, a plastic layer or an optical adhesive layer;
  • the concentrating surface of the transparent dielectric layer is a sloped surface, a spherical crown surface, an ellipsoidal crown surface, a conical side surface or a pyramid surface side .
  • the transparent medium layer has a refractive index of 1.2 or more.
  • At least one of the first surface and the second surface of the transparent substrate has a filter layer.
  • a new optical fingerprint sensor module is provided.
  • the optical fingerprint sensor includes only one transparent substrate.
  • the optical fingerprint sensor has a simple structure and a reduced thickness, so that the structure of the optical fingerprint sensor module is simplified, and the cost is reduced.
  • the entire optical fingerprint sensor module can accurately realize the fingerprint image recognition without the need of the light guide plate, further improving the sharpness of the fingerprint image, and further simplifying the structure of the optical fingerprint sensor module and reducing The cost.
  • the dot backlight can include two LED lights.
  • the dot backlight can include two LED lights.
  • the surface of the optical fingerprint sensor near the point backlight may further include a light anti-reflection layer, and the light anti-reflection layer can increase the proportion of the light of the point backlight into the optical fingerprint sensor, thereby being able to utilize the fingerprint image acquisition. More light is used to capture the fingerprint image, thereby obtaining a fingerprint image with higher definition and accuracy, and further improving the performance of the optical fingerprint sensor module.
  • a concentrating lens is disposed in front of the light emitting surface of the dot backlight, and the condensing lens can convert the light of the point backlight into parallel light or near parallel light, and the light of the point backlight enters the condensing lens first, and then enters
  • the optical fingerprint sensor therefore, can capture fingerprint images by using parallel rays or near-parallel rays during fingerprint image acquisition, thereby obtaining fingerprint images with smaller distortion and higher accuracy, and further improving the optical fingerprint sensor module. performance.
  • a transparent dielectric layer is further included between the optical fingerprint sensor and the dot backlight.
  • the lower surface of the transparent dielectric layer can be formed into a condensing surface, and the condensing surface can make the point
  • the light of the backlight is converted into parallel light or near-parallel light, and the light of the point backlight first enters the transparent medium layer through the concentrating surface, and then enters the optical fingerprint sensor, so that parallel light can be utilized in fingerprint image acquisition.
  • near-parallel rays are used to collect fingerprint images, thereby obtaining fingerprint images with smaller distortion and higher accuracy, and further improving the performance of the optical fingerprint sensor module.
  • the lower surface of the transparent medium layer may further include a light anti-reflection layer, which can increase the proportion of the light of the point backlight into the transparent medium layer, thereby utilizing more when performing fingerprint image acquisition.
  • the light is collected by the fingerprint image to obtain a fingerprint image with higher definition and accuracy, thereby further improving the performance of the optical fingerprint sensor module.
  • FIG. 1 is a top plan view of an optical fingerprint sensor and a dot backlight in an optical fingerprint sensor module according to a first embodiment of the present invention
  • FIG. 2 is a schematic cross-sectional view of an optical fingerprint sensor module according to a first embodiment of the present invention
  • FIG. 3 is a cross-sectional view of an optical fingerprint sensor module according to a second embodiment of the present invention.
  • FIG. 4 is a cross-sectional view showing an optical fingerprint sensor module according to a third embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of an optical fingerprint sensor module according to a fourth embodiment of the present invention.
  • FIG. 6 is a cross-sectional view of an optical fingerprint sensor module according to a fifth embodiment of the present invention.
  • FIG. 7 is a cross-sectional view of an optical fingerprint sensor module according to a sixth embodiment of the present invention.
  • FIG. 8 is a cross-sectional view of an optical fingerprint sensor module according to a seventh embodiment of the present invention.
  • an existing optical fingerprint sensor it is generally required to include a light-transmitting substrate and a protective layer. This structure inevitably results in a larger thickness of the entire optical fingerprint sensor. The larger thickness also causes the light emitted by the light source to reach the photosensitive element after a long optical path, resulting in the quality of the captured fingerprint image cannot be further improved.
  • the present invention provides a new optical fingerprint sensor module.
  • the protective layer is omitted, thereby not only reducing the thickness of the optical fingerprint sensor module, but also improving the quality of the formed fingerprint image.
  • the first embodiment of the present invention provides an optical fingerprint sensor module. Please refer to FIG. 1 and FIG. 2 in combination.
  • FIG. 1 is a top plan view of the optical fingerprint sensor module (the dotted line portion in FIG. 1 represents the structure located in the lower layer, which can be combined with reference to FIG. 2).
  • 2 is a schematic cross-sectional view of the optical fingerprint sensor module. The cross section shown in Fig. 2 is a cross section taken along the line A-A dotted line shown in Fig. 1 to cut the optical fingerprint sensor module.
  • the optical fingerprint sensor module includes an optical fingerprint sensor 110 and a dot backlight 120.
  • the optical fingerprint sensor 110 has one and only one light transmissive substrate 111.
  • the first surface (not labeled) of the light transmissive substrate 111 is directly used for finger fingerprint contact.
  • the second surface (not labeled) of the light transmissive substrate 111 has a device layer 112. In FIG. 2, the first surface is an upper surface of the transparent substrate 111, and the second surface is a lower surface of the transparent substrate 111.
  • the thickness of the light-transmitting substrate 111 may be set to be 5 cm or less.
  • the material of the transparent substrate 111 may be glass or plastic or the like.
  • the device layer 112 has a pixel region 1120.
  • pixel region 1120 is labeled between two long dashed lines, representing that in the plane shown in FIG. 2, pixel region 1120 is located between two long dashed lines in device layer 112.
  • the area between the two long dashed lines below the pixel area 1120 is the area directly below the pixel area 1120.
  • the labeling of the corresponding pixel regions is also performed by the above method, which will be described together.
  • the pixel area 1120 has a rectangular shape, and the size of each side of the pixel area 1120 can be selected according to the needs of the product.
  • the pixel area 1120 has a plurality of pixels (not shown), and the plurality of pixels may be arranged in a matrix of rows and columns, and corresponding rows of data lines (not shown) may be disposed between the rows and columns of pixels. And a line structure such as a scan line (not shown).
  • a specific arrangement manner may be: multiple scan lines are arranged along the first axial direction, and multiple data lines are arranged along the second axial line.
  • the scan, scan and data lines define a plurality of grids, the pixels being in the grid.
  • each pixel may be a rectangle, and each side of the rectangle has a size smaller than or equal to 100 ⁇ m.
  • each of the pixels has a light transmitting region (not shown) and a non-light transmitting region (not shown) having a photosensitive member (not shown), which is transparent.
  • the light region enables light to pass through the pixel region 1120 of the device layer 112.
  • the area other than the pixel area 1120 can be based on ensuring the corresponding structure and the corresponding functions (for example, it is necessary to fabricate a driving circuit and a binding pin in the peripheral area of the pixel area 1120 to implement functions such as driving and binding).
  • a light transmissive structure is formed on a partial region around the pixel region 1120.
  • the dot backlight 120 is located directly below the pixel area 1120, and there is a space between the dot backlight 120 and the optical fingerprint sensor 110 (this interval is the subsequent third distance D3), and the dot backlight 120 is emitted.
  • the angle between the light and the first surface of the transparent substrate 111 is a right angle or a close angle. Wherein, the angle close to the right angle means that the angle is between 85° and 90°.
  • the dot backlight 120 is located below the device layer 112, and the emitted light of the dot backlight 120 passes through the device layer 112 from the light transmitting region and enters the transparent substrate 111.
  • the dot backlight 120 is an LED lamp.
  • the light of the LED lamp may be near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light.
  • the light emitted by the dot backlight 120 is as shown by the black one-way arrow in FIG.
  • the dot-shaped backlight 120 in the horizontal direction, has a first distance D1 from the left edge of the region directly below the pixel region 1120 (the first distance D1 is also shown in FIG. 1), and the dot shape
  • the backlight 120 has a second distance D2 from the right edge of the region directly below the pixel region 1120 (the second distance D2 is also shown in FIG. 1), and in the vertical direction, the dot backlight 120 and the entire optical fingerprint sensor There is a third distance D3 between 110.
  • the dot backlight 120 is necessarily located directly below the pixel region 1120 due to the presence of the first distance D1, the second distance D2, and the third distance D3.
  • the point backlight 120 is in a proper position, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.
  • one pixel further includes a light shielding layer
  • the photosensitive element is located between the light shielding layer and the transparent substrate 111
  • the light shielding layer is located at the photosensitive element and the dot backlight. Between 120. Since the light shielding layer is disposed at the corresponding position, the photosensitive element can only receive the light signal entering the device layer 110 from the transparent substrate 111, and the emitted light of the dot backlight 120 cannot be directly irradiated from below the device layer 110.
  • the photosensitive element is not shown in the figure, in the embodiment, one pixel further includes a light shielding layer, the photosensitive element is located between the light shielding layer and the transparent substrate 111, and the light shielding layer is located at the photosensitive element and the dot backlight. Between 120. Since the light shielding layer is disposed at the corresponding position, the photosensitive element can only receive the light signal entering the device layer 110 from the transparent substrate 111, and the emitted light of the dot backlight 120 cannot be directly irradiated from below the device layer
  • At least one of the first surface and the second surface of the light transmissive substrate may have a filter layer.
  • the filter layer may include at least one of an interference reflective layer and a light absorbing layer.
  • the interference emitting layer can increase the difference of the reflected light between the finger and the fingerless, thereby increasing the image contrast and reducing the interference of the ambient light on the fingerprint image, so as to reduce the influence of the ambient light on the fingerprint imaging.
  • the dot backlight may include two or more LED lamps, and two or more LED lamps may be symmetrically and evenly distributed directly under the optical fingerprint sensor, and each LED lamp emits light. Both can be near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light.
  • the dot backlight includes two or more LED lights, the light of each LED light may be the same or different, and the light of some LED lights may be the same, and the light of some LED lights is different.
  • the optical fingerprint sensor 110 includes only one transparent substrate 111. At this time, the light emitted by the dot backlight 120 only needs to pass through the device when passing through the optical fingerprint sensor 110.
  • the layer 112 and a light transmissive substrate 111 therefore, the light passes through fewer substrates, helping to form a clear fingerprint image.
  • the optical fingerprint sensor 110 since the optical fingerprint sensor 110 has a simple structure and a reduced thickness, the structure of the optical fingerprint sensor module is simplified, and the cost is reduced.
  • the dot backlight 120 and the optical fingerprint sensor there is a space between the 110s, and the angle between the light emitted by the dot backlight 120 and the first surface of the transparent substrate 111 is a right angle or a right angle, and the light reaching the first surface can usually be pressed.
  • the smaller offset (or zero offset) is reflected at the interface of the first surface and the finger fingerprint, and causes most of the effective reflected light to illuminate into the pixel in the pixel region 1120 that is closer to the corresponding reflection point, thus, the whole
  • the optical fingerprint sensor module can accurately realize the fingerprint image recognition without the need of the light guide plate, further improves the definition of the fingerprint image, and further simplifies the structure of the optical fingerprint sensor module, thereby reducing the cost.
  • a second embodiment of the present invention provides another optical fingerprint sensor module. Please refer to FIG. 3. 3 is a cross-sectional view of the optical fingerprint sensor module including an optical fingerprint sensor 210 and a dot backlight (not labeled).
  • the optical fingerprint sensor 210 has one and only one transparent substrate 211.
  • the first surface (not labeled) of the light transmissive substrate 211 is directly used for finger fingerprint contact.
  • the second surface (not labeled) of the light transmissive substrate 211 has a device layer 212.
  • the first surface is an upper surface of the light transmissive substrate 211
  • the second surface is a lower surface of the light transmissive substrate 211.
  • the device layer 212 has a pixel region 2120 having a plurality of pixels (not shown), each of the pixels having a light transmissive region (not shown) and a non-transmissive region (not shown).
  • the non-transmissive region has a photosensitive element (not shown) that enables light to pass through the pixel region 2120 of the device layer 212.
  • the dot backlight includes two LED lamps, which are an LED lamp 220 and an LED lamp 230, respectively.
  • the LED lamp 220 and the LED lamp 230 are located directly below the pixel area 2120, and they have a third distance F3 and a sixth distance F6 with the optical fingerprint sensor 210, respectively. That is, the dot backlight is located directly below the pixel region 2120, and the dot backlight and the optical fingerprint sensor 210 have a space therebetween.
  • the angle between the LED lamp 220 and the LED lamp 230 and the first surface is mainly a right angle or Close to the right angle. That is, the angle between the light emitted by the dot backlight and the first surface is mainly a right angle or a close angle.
  • the light emitted by the LED lamp 220 and the LED lamp 230 is as shown by the black one-way arrow in FIG.
  • the LED lamp 220 and the LED lamp 230 are located directly below the pixel region 2120.
  • the LED lamp 220 is located on the left side of the LED lamp 230.
  • the LED lamp 220 In the cross section shown in FIG. 3, in the horizontal direction, between the LED lamp 220 and the left edge of the region directly below the pixel region 2120, there is a first distance F1 between the LED lamp 220 and the right edge of the region directly below the pixel region 2120. Has a second distance F2. In the vertical direction, the LED lamp 220 has a third distance F3 from the entire optical fingerprint sensor 210. As can be seen from the above, the LED lamp 220 is necessarily located directly below the pixel region 2120 due to the presence of the first distance F1, the second distance F2, and the third distance F3.
  • the LED light 220 can be placed in an appropriate position by adjusting the sizes of the first distance F1, the second distance F2, and the third distance F3, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.
  • the LED lamp 230 in the cross section shown in FIG. 3, in the horizontal direction, has a fourth distance F4 between the left edge of the area directly below the pixel area 2120, and the right side of the area below the LED lamp 230 and the pixel area 2120. There is a fifth distance F5 between the edges. In the vertical direction, the LED lamp 230 has a sixth distance F6 from the entire optical fingerprint sensor 210. As can be seen from the above, the LED lamp 230 is necessarily located directly below the pixel region 2120 due to the presence of the fourth distance F4, the fifth distance F5, and the sixth distance F6.
  • the LED light 230 can be placed in an appropriate position by adjusting the sizes of the fourth distance F4, the fifth distance F5, and the sixth distance F6, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.
  • the light of the LED lamp 220 and the LED lamp 230 may be near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light.
  • the light of the two LED lights may be the same or different.
  • the point backlight includes three or more LED lights. Three or more LED lamps may be symmetrically and evenly distributed below the optical fingerprint sensor 210. For example, when the dot backlight includes four LED lamps, when the planar shape of the pixel region 2120 is rectangular, the four LED lamps may be symmetrically distributed under the four sides of the rectangular pixel region 2120.
  • the light of each LED lamp may be near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light, and the light of each LED lamp may be the same. It can also be different, and the light of some LED lights can be the same, and the light of some LED lights is different.
  • the dot backlight includes two or more LED lamps (for example, the LED lamp 220 and the LED lamp 230 in this embodiment), the closest distance from the pixel region 2120 among all the LED lamps may be used as The distance from the point backlight to the pixel region 2120.
  • the entire optical fingerprint sensor module can realize fingerprint image recognition without forming a light guide plate, and form a clear fingerprint image, which simplifies the optical fingerprint sensor module. Structure, reducing costs.
  • the dot backlight includes the LED lamp 220 and the LED lamp 230, when the fingerprint image is captured, the light of any one of the LED lamps can be selected as the imaging light of the fingerprint image, and the two LED lamps can be used in turn. Both sets of light are imaged, and then noise reduction and compensation calculations are performed to obtain a fingerprint image with higher definition and accuracy, which further improves the performance of the optical fingerprint sensor module.
  • the dot backlight when the dot backlight includes more LED lights, it is also possible to take turns to use each group of light emitted by each LED lamp to perform imaging, and then perform noise reduction and compensation calculations to obtain sharpness and accuracy.
  • the high fingerprint image further enhances the performance of the optical fingerprint sensor module.
  • optical fingerprint sensor module For more details about the structure and properties of the optical fingerprint sensor module provided in this embodiment, reference may be made to the corresponding content of the optical fingerprint sensor module provided in the foregoing embodiment.
  • FIG. 4 is a cross-sectional view of the optical fingerprint sensor module.
  • the optical fingerprint sensor module includes an optical fingerprint sensor 310 and a dot shape. Backlight 320.
  • the optical fingerprint sensor 310 has one and only one transparent substrate 311.
  • the first surface (not labeled) of the light transmissive substrate 311 is directly used for finger fingerprint contact.
  • the second surface (not labeled) of the light transmissive substrate 311 has a device layer 312.
  • the first surface is an upper surface of the transparent substrate 311, and the second surface is a lower surface of the transparent substrate 311.
  • device layer 312 has a pixel region 3120.
  • the pixel region 3120 has a plurality of pixels (not shown) each having a light transmitting region (not shown) and a non-light transmitting region (not shown) having a photosensitive member (not shown)
  • the light transmissive region allows light to pass through the pixel region 3120 of the device layer 312.
  • the dot backlight 320 is located below the pixel region 3120, and there is a space between the dot backlight 320 and the optical fingerprint sensor 310 (ie, the distance between the dot backlight 320 and the lower surface of the device layer 312 of the sensor 310).
  • the angle between the light emitted by the dot backlight 320 and the first surface of the transparent substrate 311 is a right angle or a right angle.
  • the dot backlight 320 is also located directly below the pixel region 3120 to ensure that the included angle is a right angle or a close angle.
  • the dot backlight 320 includes an LED lamp.
  • the light emitted by the dot backlight 320 is as shown by the black one-way arrow in FIG. Since the dot backlight 320 is located directly below the pixel region 3120, in the cross section shown in FIG. 4, the dot backlight 320 is located directly below the pixel region 3120.
  • the dot-shaped backlight 320 in the horizontal direction, has a first distance G1 from the left edge of the region directly below the pixel region 3120, and the dot-shaped backlight 320 and the right edge of the region directly below the pixel region 3120 There is a second distance G2 between them.
  • the point backlight 320 has a third distance G3 from the lower surface of the device layer 312 of the sensor 310.
  • the dot backlight 320 is necessarily located directly below the pixel region 3120 due to the presence of the first distance G1, the second distance G2, and the third distance G3.
  • the point backlight 320 is in a proper position, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.
  • the surface of the optical fingerprint sensor 310 near the point backlight 320 further includes a light anti-reflection layer 330 capable of increasing the proportion of the light of the point backlight 320 entering the optical fingerprint sensor 310 .
  • the light anti-reflection layer 330 is directly laminated on the surface of the device layer 312, thereby reducing the thickness of the optical fingerprint sensor module.
  • the entire optical fingerprint sensor module can realize fingerprint image recognition, form a clear fingerprint image, and simplify the optical fingerprint sensor module without requiring a light guide plate.
  • the structure reduces costs.
  • the surface of the optical fingerprint sensor 310 near the point backlight 320 further includes a light anti-reflection layer 330, which can increase the proportion of the light of the point backlight 320 into the optical fingerprint sensor 310. Therefore, the fingerprint image is performed. When collecting, more light can be used to collect the fingerprint image, thereby obtaining a fingerprint image with higher definition and accuracy, and further improving the performance of the optical fingerprint sensor module.
  • optical fingerprint sensor module For more details about the structure and properties of the optical fingerprint sensor module provided in this embodiment, reference may be made to the corresponding content of the optical fingerprint sensor module provided in the foregoing embodiment.
  • FIG. 5 is a cross-sectional view of the optical fingerprint sensor module.
  • the optical fingerprint sensor module includes an optical fingerprint sensor 410 and a dot shape. Backlight 420.
  • the optical fingerprint sensor 410 has one and only one transparent substrate 411.
  • the first surface (not labeled) of the light transmissive substrate 411 is directly used for finger fingerprint contact.
  • the second surface (not labeled) of the light transmissive substrate 411 has a device layer 412.
  • the first surface is an upper surface of the light-transmitting substrate 411
  • the second surface is a lower surface of the light-transmitting substrate 411.
  • the pixel region 4120 has a plurality of pixels (not shown), each of which has a light transmitting region (not shown) and a non-light transmitting region (not shown), and the non-light transmitting region has A light-receiving element (not shown) that allows light to pass through the pixel region 4120 of the device layer 412.
  • the dot backlight 420 is located below the pixel region 4120, and the dot backlight 420 and the optical fingerprint sensor 410 are spaced apart (the third distance H3), and the light emitted from the dot backlight 420 and the transparent substrate are
  • the angle formed by the first surface of 411 is a right angle or a close angle.
  • the dot backlight 420 is also located directly below the pixel region 4120 to ensure that the included angle is a right angle or a close angle.
  • the dot backlight 420 includes an LED lamp.
  • the light emitted by the dot backlight 420 is as indicated by the black one-way arrow in FIG.
  • the dot backlight 420 in the horizontal direction, has a first distance H1 from the left edge of the region directly below the pixel region 4120, and the dot backlight 420 and the right edge of the region directly below the pixel region 4120 There is a second distance H2 between them.
  • the point backlight 420 has a third distance H3 from the lower surface of the device layer 412 of the sensor 410.
  • the dot backlight 420 is necessarily located directly below the pixel region 4120 due to the presence of the first distance H1, the second distance H2, and the third distance H3.
  • the point backlight 420 can be in a proper position by adjusting the sizes of the first distance H1, the second distance H2, and the third distance H3, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.
  • the light-emitting surface of the dot backlight 420 has a collecting lens 430.
  • the collecting lens 430 can convert the light of the point backlight 420 into parallel light or near-parallel light, and the light of the dot backlight 420 is first.
  • the condensing lens 430 is entered and the optical fingerprint sensor 410 is entered.
  • the near-parallel light refers to a maximum angular difference between all light rays within 10 degrees.
  • the condensing lens 430 is a convex lens. At this time, when the distance of the point backlight 420 from the condensing lens 430 is exactly equal to the focal length of the lenticular lens, the light passing through the condensing lens 430 is adjusted to be parallel light. .
  • the concentrating lens 430 may also be other suitable lenses, such as Fresnel lenses.
  • the entire optical fingerprint sensor module can realize fingerprint image recognition without forming a light guide plate, form a clear fingerprint image, and simplify the structure of the optical fingerprint sensor module, thereby reducing the cost.
  • a condensing lens 430 is disposed in front of the light emitting surface of the dot backlight 420.
  • the condensing lens 430 can convert the light of the point backlight 420 into parallel light or near parallel light, and the light of the point backlight 420 enters the first light.
  • the optical lens 430 re-enters the optical fingerprint sensor 410. Therefore, when fingerprint image acquisition is performed, the fingerprint image can be collected by using parallel rays or near-parallel rays, thereby obtaining a fingerprint image with smaller distortion and higher accuracy, and further Improve the performance of optical fingerprint sensor modules.
  • optical fingerprint sensor module For more details about the structure and properties of the optical fingerprint sensor module provided in this embodiment, reference may be made to the corresponding content of the optical fingerprint sensor module provided in the foregoing embodiment.
  • a fifth embodiment of the present invention provides another optical fingerprint sensor module. Please refer to FIG. 6.
  • FIG. 6 is a cross-sectional view of the optical fingerprint sensor module.
  • the optical fingerprint sensor module includes an optical fingerprint sensor 510 and a dot shape. Backlight (not labeled).
  • the optical fingerprint sensor 510 has one and only one transparent substrate 511.
  • the first surface (not labeled) of the light transmissive substrate 511 is directly used for finger fingerprint contact.
  • the second surface (not labeled) of the light transmissive substrate 511 has a device layer 512.
  • the first surface is an upper surface of the light transmissive substrate 511
  • the second surface is a lower surface of the light transmissive substrate 511.
  • the device layer 512 has a pixel region 5120.
  • the pixel region 5120 has a plurality of pixels (not shown) each having a light transmitting region (not shown) and a non-light transmitting region (not shown) having a photosensitive member (not shown)
  • the light transmissive region enables light to pass through the pixel region 5120 of the device layer 512.
  • the dot backlight is located below the pixel region 5120 , and the angle between the light emitted by the dot backlight and the first surface of the transparent substrate 511 is a right angle or a right angle. Specifically, the point backlight is also located directly below the pixel area 5120.
  • the dot backlight includes an LED lamp 520 and an LED lamp 530.
  • the LED lamp 520 and the LED lamp 530 are located below the pixel region 5120, and the angle between the light emitted by the LED lamp 520 and the LED lamp 530 and the upper surface of the first surface is a right angle or a close angle.
  • the light emitted by the point backlight is as shown by a black one-way arrow in FIG.
  • the LED lamp 520 in the horizontal direction, between the LED lamp 520 and the left edge of the region directly below the pixel region 5120, there is a first distance I1 between the LED lamp 520 and the right edge of the region directly below the pixel region 5120.
  • the LED lamp 520 In the vertical direction, the LED lamp 520 has a third distance I3 from the lower surface of the device layer 512 of the sensor 510.
  • the LED lamp 520 is necessarily located directly below the pixel region 5120 due to the presence of the first distance I1, the second distance I2, and the third distance I3.
  • the LED light 520 can be placed in an appropriate position by adjusting the sizes of the first distance I1, the second distance I2, and the third distance I3, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.
  • the LED lamp 530 in the cross section shown in FIG. 6, in the horizontal direction, has a fourth distance I4 between the left edge of the region directly below the pixel region 5120, and the right side of the region below the LED lamp 530 and the pixel region 5120. There is a fifth distance I5 between the edges. In the vertical direction, the LED lamp 530 has a sixth distance I6 from the lower surface of the device layer 512 of the sensor 510. As can be seen from the above, the LED lamp 530 is necessarily located directly below the pixel region 5120 due to the presence of the fourth distance I4, the fifth distance I5, and the sixth distance I6.
  • the sum of the fourth distance I4, the fifth distance I5, and the width of the LED lamp 530 itself is always equal to one of the side lengths of the pixel region 5120 (refer to the side length E1 in FIG. 1).
  • the LED light 530 can be placed in an appropriate position by adjusting the sizes of the fourth distance I4, the fifth distance I5, and the sixth distance I6, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.
  • a condensing lens 540 is disposed between the LED lamp 520 and the optical fingerprint sensor 510
  • a condensing lens 550 is disposed between the LED lamp 530 and the optical fingerprint sensor 510. That is, the front surface of the LED lamp 520 has a collecting lens 540, and the collecting lens 540 can convert the light of the LED lamp 520 into parallel light. Or near-parallel light, the light of the LED lamp 520 first enters the collecting lens 540 and then enters the optical fingerprint sensor 510.
  • the light-emitting surface of the LED lamp 530 has a collecting lens 550.
  • the collecting lens 550 can convert the light of the LED lamp 530 into parallel light or near-parallel light. The light of the LED lamp 530 first enters the collecting lens 550 and then enters the optical fingerprint sensor. 510.
  • the entire optical fingerprint sensor module can realize fingerprint image recognition without forming a light guide plate, and form a clear fingerprint image, which simplifies the optical fingerprint sensor module. Structure, reducing costs.
  • a condenser lens 540 and a collecting lens 550 are respectively disposed in front of the light emitting surface of the LED lamp 520 and the LED lamp 530.
  • the collecting lens 540 and the collecting lens 550 can convert the light of the LED lamp 520 and the LED lamp 530 into parallel light, respectively. Or near-parallel light, the light of the LED lamp 520 and the LED lamp 530 first enters the corresponding collecting lens, and then enters the optical fingerprint sensor 510. Therefore, when the fingerprint image is captured, the parallel light or the near parallel light can be used for the fingerprint image.
  • the acquisition is performed to obtain a fingerprint image with smaller distortion and higher accuracy, which further improves the performance of the optical fingerprint sensor module.
  • FIG. 7 is a schematic cross-sectional view of the optical fingerprint sensor module.
  • the optical fingerprint sensor module includes an optical fingerprint sensor 610 and a dot shape. Backlight 620.
  • the optical fingerprint sensor 610 has one and only one transparent substrate 611.
  • the first surface (not labeled) of the light transmissive substrate 611 is directly used for finger fingerprint contact.
  • the second surface (not labeled) of the light transmissive substrate 611 has a device layer 612.
  • the first surface is an upper surface of the light transmissive substrate 611
  • the second surface is a lower surface of the light transmissive substrate 611.
  • device layer 612 has a pixel region 6120.
  • the pixel region 6120 has a plurality of pixels (not shown) each having a light transmitting region (not shown) and a non-light transmitting region (not shown) having a photosensitive member (not shown)
  • the light transmissive region enables light to pass through the pixel region 6120 of the device layer 612.
  • the dot backlight 620 is located below the pixel region 6120, and the dot backlight 620 and the optical fingerprint sensor 610 have a space (third distance J3), and a dot shape.
  • the angle between the light emitted by the backlight 620 and the first surface of the transparent substrate 611 is a right angle or a right angle.
  • the dot backlight 620 is also located directly below the pixel region 6120 to ensure that the included angle is a right angle or a close angle.
  • the light emitted by the dot backlight 620 is as shown by the black one-way arrow in FIG.
  • the dot-shaped backlight 620 has a first distance J1 between the left edge of the region directly below the pixel region 6120, and the dot-shaped backlight 620 and the pixel region 6120 are directly below.
  • the dot backlight 620 is necessarily located directly below the pixel region 6120 due to the presence of the first distance J1, the second distance J2, and the third distance J3.
  • the point backlight 620 can be in a proper position by adjusting the sizes of the first distance J1, the second distance J2, and the third distance J3, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.
  • the optical fingerprint sensor 610 and the dot backlight 620 further include a transparent medium layer 630, and the light emitted by the dot backlight 620 first enters the transparent medium layer. 630, and then enter optical fingerprint sensor 610.
  • the refractive index of the transparent dielectric layer 630 is always greater than the refractive index of the air, and the lower surface of the transparent dielectric layer 630 is a concentrating surface (not labeled in FIG. 7).
  • the condensing surface of the transparent medium layer 630 can convert the light of the point backlight 620 into parallel light or near-parallel light, and the light of the point backlight 620 first enters the transparent medium layer 630 and then enters the optical
  • the fingerprint sensor 610 therefore, can capture fingerprint images by using parallel rays or near-parallel rays during fingerprint image acquisition, thereby obtaining fingerprint images with smaller distortion and higher accuracy, and further improving the optical fingerprint sensor module. performance.
  • the optical fingerprint sensor 610 itself still has only one transparent substrate 611. At this time, the optical fingerprint sensor 610 is still a simplified structure, that is, the transparent medium layer 630 is disposed on the optical fingerprint sensor 610 and the dot backlight 620. The structure does not form part of the optical fingerprint sensor 610.
  • the refractive index of the transparent dielectric layer 630 can be further selected to be 1.2 or more, thereby further improving the performance of the optical fingerprint sensor module.
  • the material of the transparent medium layer 630 may specifically be a glass layer, a plastic layer or an optical glue layer.
  • the concentrating surface of the transparent medium layer 630 is an ellipsoidal crown surface. In other embodiments, the concentrating surface of the transparent medium layer 630 may also be a sloped surface, a spherical crown surface, a conical side surface, or a pyramid side surface.
  • a second optical adhesive layer may be disposed between the optical fingerprint sensor 610 and the transparent medium layer 630, and the light emitted by the point backlight 620 is transmitted through the light.
  • the dielectric layer 630 first enters the second optical adhesive layer, and then enters the optical fingerprint sensor 610 from the second optical adhesive layer.
  • the second optical adhesive layer can prevent air from being present between the optical fingerprint sensor 610 and the transparent medium layer 630, thereby preventing light from being scattered and refracted in the air between the optical fingerprint sensor 610 and the transparent medium layer 630, thereby improving subsequent fingerprints. The quality of the image.
  • optical fingerprint sensor module For more details about the structure and properties of the optical fingerprint sensor module provided in this embodiment, reference may be made to the corresponding content of the optical fingerprint sensor module provided in the foregoing embodiment.
  • a seventh embodiment of the present invention provides another optical fingerprint sensor module. Please refer to FIG. 8.
  • FIG. 8 is a schematic cross-sectional view of the optical fingerprint sensor module.
  • the optical fingerprint sensor module includes an optical fingerprint sensor 710 and a dot shape.
  • the optical fingerprint sensor 710 has one and only one transparent substrate 711.
  • the first surface (not labeled) of the light transmissive substrate 711 is directly used for finger fingerprint contact.
  • the second surface (not labeled) of the light transmissive substrate 711 has a device layer 712.
  • the first surface is an upper surface of the light-transmitting substrate 711
  • the second surface is a lower surface of the light-transmitting substrate 711.
  • the device layer 712 has a pixel region 7120 having a plurality of pixels (not shown), each of which has a light transmitting region (not shown) and a non-transparent light. A region (not shown) having a photosensitive element (not shown) that allows light to pass through the pixel region 7120 of the device layer 712.
  • the dot backlight 720 is located below the pixel region 7120, and the dot backlight 720 and the optical fingerprint sensor 710 have a space (the distance from the lower surface of the device layer 712 of the sensor 710 is a third distance K3).
  • the angle between the light emitted by the dot backlight 720 and the first surface of the transparent substrate 711 is a right angle or a right angle.
  • the dot backlight 720 is also located directly below the pixel region 7120 to ensure that the above angle is a right angle or a close angle.
  • the light emitted by the dot backlight 720 is as shown by the black one-way arrow in FIG.
  • the dot-shaped backlight 720 in the horizontal direction, has a first distance K1 from the left edge of the region directly below the pixel region 7120, and the dot-shaped backlight 720 and the pixel region 7120 are located directly below.
  • the dot backlight 620 is necessarily located directly below the pixel region 6120 due to the presence of the first distance K1, the second distance K2, and the third distance K3.
  • the point backlight 620 is in a proper position, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.
  • the optical fingerprint sensor 710 and the dot backlight 720 further include a transparent medium layer 730 .
  • the light emitted by the dot backlight 720 first enters the transparent medium layer 730 and then enters the optical fingerprint sensor 710 .
  • the refractive index of the transparent dielectric layer 730 can be further selected to be 1.2 or more, thereby further improving the performance of the optical fingerprint sensor module.
  • the material of the transparent medium layer 730 may specifically be a glass layer, a plastic layer or an optical glue layer.
  • the lower surface of the transparent medium layer 730 is a condensing surface (not labeled in FIG. 8 ), and the light emitted by the point backlight 720 enters the transparent medium layer from the condensing surface. 730.
  • the concentrating surface converts light emitted by the point backlight 720 into parallel light or near parallel light.
  • the concentrating surface of the transparent medium layer 730 (specifically on the lower surface) further has a light anti-reflecting layer 740 capable of increasing the light of the point backlight 720 into the transparent medium layer. Therefore, when fingerprint image acquisition is performed, more light can be used for fingerprint image acquisition, thereby obtaining a fingerprint image with higher definition and accuracy, and further improving the performance of the optical fingerprint sensor module.
  • optical fingerprint sensor module For more details about the structure and properties of the optical fingerprint sensor module provided in this embodiment, reference may be made to the corresponding content of the optical fingerprint sensor module provided in the foregoing embodiment.

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Abstract

一种光学指纹传感器模组，所述光学指纹传感器模组包括：光学指纹传感器（110）；点状背光源（120）；所述光学指纹传感器（110）有且只有一个透光基板（111）；所述透光基板（111）的第一表面直接用于手指指纹接触；所述透光基板（111）的第二表面具有器件层（112）；所述器件层（112）具有像素区（1120）；所述像素区（1120）具有多个像素；每个所述像素具有透光区域和非透光区域；所述非透光区域具有感光元件；所述透光区域使光线能够透过所述器件层（112）的所述像素区；所述点状背光源（120）位于所述像素区（1120）正下方，所述点状背光源（120）和所述光学指纹传感器（110）之间具有间隔，所述点状背光源（120）发出的光线与所述透光基板（111）的所述第一表面所成的夹角为直角或者接近于直角。所述光学指纹传感器模组结构简化且性能提高。

Description

光学指纹传感器模组
本申请要求于2016年07月08日提交中国专利局、申请号为201610537307.4、发明名称为“光学指纹传感器模组”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及光学指纹识别领域，尤其涉及一种光学指纹传感器模组。
背景技术
指纹成像识别技术，是通过光学指纹传感器采集到人体的指纹图像，然后与系统里的已有指纹成像信息进行比对，来判断正确与否，进而实现身份识别的技术。由于其使用的方便性，以及人体指纹的唯一性，指纹成像识别技术已经大量应用于各个领域。比如公安局和海关等安检领域、楼宇的门禁系统、以及个人电脑和手机等消费品领域等等。指纹成像识别技术的实现方式有光学成像、电容成像、超声成像等多种技术。相对来说，光学指纹成像识别技术成像效果相对较好，设备成本相对较低。
更多有关光学指纹传感器的内容可参考公开号为CN203405831U的中国实用新型专利。
现有光学指纹传感器的模组的结构有待改进，性能有待提高。
发明内容
本发明解决的问题是提供一种光学指纹传感器模组，以优化光学指纹传感器模组的结构，提高光学指纹传感器模组的性能。
为解决上述问题，本发明提供一种光学指纹传感器模组，包括：光学指纹传感器；点状背光源；所述光学指纹传感器有且只有一个透 光基板；所述透光基板的第一表面直接用于手指指纹接触；所述透光基板的第二表面具有器件层；所述器件层具有像素区；所述像素区具有多个像素；每个所述像素具有透光区域和非透光区域；所述非透光区域具有感光元件；所述透光区域使光线能够透过所述器件层的所述像素区；所述点状背光源位于所述像素区正下方，所述点状背光源和所述光学指纹传感器之间具有间隔，所述点状背光源发出的光线与所述透光基板的所述第一表面所成的夹角为直角或者接近于直角。
可选的，所述点状背光源位于所述器件层下方，所述点状背光源的出射光从所述透光区域穿过所述器件层，再进入所述透光基板。
可选的，一个所述像素还包括遮光层，所述感光元件位于所述遮光层与所述透光基板之间，所述遮光层位于所述感光元件与所述点状背光源之间。
可选的，所述点状背光源包括至少一个LED灯，所述LED灯的光为近紫外光、紫色光、蓝色光、绿色光、黄色光、红色光、近红外光或白色光；或者，所述点状背光源包括两个或两个以上LED灯，所述两个或两个以上LED灯对称地分布在所述光学指纹传感器的正下方，所述LED灯的光为近紫外光、紫色光、蓝色光、绿色光、黄色光、红色光、近红外光或白色光。
可选的，所述点状背光源的出光面前面具有聚光透镜，所述聚光透镜能够使所述点状背光源的光线转换为平行光或近平行光，所述点状背光源的光线先进入所述聚光透镜，再进入所述光学指纹传感器。
可选的，所述器件层的表面还包括光增透层，所述光增透层能够增加所述点状背光源的光线进入所述光学指纹传感器的比例。
可选的，所述光学指纹传感器和所述点状背光源之间还包括透光介质层，所述点状背光源发出的光线先进入所述透光介质层，然后再进入所述光学指纹传感器。
可选的，所述透光介质层的下表面做为聚光面，所述点状背光源 发出的光线从所述聚光面进入所述透光介质层，所述聚光面将所述点状背光源发出的光线转换为平行光或近平行光。
可选的，所述透光介质层的所述下表面上还具有光增透层，所述光增透层能够增加所述点状背光源的光线进入所述透光介质层的比例。
可选的，所述透光介质层为玻璃层、塑料层或者光学胶层；所述透光介质层的所述聚光面为斜面、球冠面、椭球冠面、圆锥侧面或者棱锥侧面。
可选的，所述透光介质层的折射率为1.2以上。
可选的，所述透光基板的所述第一表面和所述第二表面的至少其中一个表面具有滤光层。
与现有技术相比，本发明的技术方案具有以下优点：
本发明的技术方案中，提供一种新的光学指纹传感器模组，模组中，光学指纹传感器仅包括一个透光基板，此时，点状背光源发出的光线在穿过光学指纹传感器时，只需要穿过器件层和一个透光基板，因此，光线经过的基板较少，有助于形成清晰的指纹图像。同时，由于光学指纹传感器结构简单，厚度减小，简化了光学指纹传感器模组的结构，降低了成本。此外，点状背光源和光学指纹传感器之间具有间隔，且点状背光源发出的光线与透光基板的所述第一表面所成的夹角为直角或者接近于直角，到达所述第一表面的光线通常都能够按较小偏移量(或者零偏移量)在第一表面和手指指纹的界面发生反射，并使大部分有效反射光线照射到像素区中离相应反射点较近的像素中，因此，整个光学指纹传感器模组在不需要导光板的情况下，就能够准确实现指纹图像的识别，进一步提高了指纹图像的清晰度，并进一步简化光学指纹传感器模组的结构，降低了成本。
进一步，点状背光源可以包括两个LED灯。在进行指纹图像采集时，既可以选择任意一个LED灯的光线作为指纹图像的成像光线， 又可以轮流利用两个LED灯发出的两组光线都进行成像，然后进行减噪和补偿等计算，从而得到清晰度和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
进一步，光学指纹传感器靠近点状背光源的表面还可以包括光增透层，光增透层能够增加点状背光源的光线进入光学指纹传感器的比例，因此，在进行指纹图像采集时，能够利用更多光线进行指纹图像的采集，从而得到清晰度和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
进一步，在点状背光源的出光面前面设置聚光透镜，聚光透镜能够使点状背光源的光线转换为平行光或近平行光，点状背光源的光线先进入聚光透镜，再进入光学指纹传感器，因此，在进行指纹图像采集时，能够利用平行光线或者近平行光线进行指纹图像的采集，从而得到更小畸变量和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
进一步，光学指纹传感器和点状背光源之间还包括透光介质层。通过增加折射率大于空气的透光介质层，并且使光线从透光介质层的下表面进入透光介质层，可以将透光介质层的下表面制作成聚光面，聚光面能够使点状背光源的光线转换为平行光或近平行光，点状背光源的光线先通过聚光面进入透光介质层，再进入光学指纹传感器，因此，在进行指纹图像采集时，能够利用平行光线或者近平行光线进行指纹图像的采集，从而得到更小畸变量和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
进一步，透光介质层的下表面还可以包括光增透层，光增透层能够增加点状背光源的光线进入透光介质层的比例，因此，在进行指纹图像采集时，能够利用更多光线进行指纹图像的采集，从而得到清晰度和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
附图说明
图1是本发明第一实施例所提供的光学指纹传感器模组中，光学指纹传感器和点状背光源的俯视示意图；
图2是本发明第一实施例所提供的光学指纹传感器模组剖面示意图；
图3是本发明第二实施例所提供的光学指纹传感器模组剖面示意图；
图4是本发明第三实施例所提供的光学指纹传感器模组剖面示意图；
图5是本发明第四实施例所提供的光学指纹传感器模组剖面示意图；
图6是本发明第五实施例所提供的光学指纹传感器模组剖面示意图；
图7是本发明第六实施例所提供的光学指纹传感器模组剖面示意图；
图8是本发明第七实施例所提供的光学指纹传感器模组剖面示意图。
具体实施方式
现有一种光学指纹传感器中，通常需要包括透光基板和保护层。这种结构不可避免地导致整个光学指纹传感器的厚度较大。而较大的厚度也导致光源发出的光线需要经过较长的光程才到达感光元件，导致采集的指纹图像质量无法进一步提高。
为此，本发明提供一种新的光学指纹传感器模组，通过简化光学指纹传感器的结构，省略保护层，从而不仅使光学指纹传感器模组厚度减小，而且提高所形成的指纹图像质量。
为使本发明的上述目的、特征和优点能够更为明显易懂，下面结 合附图对本发明的具体实施例做详细的说明。
本发明第一实施例提供一种光学指纹传感器模组，请结合参考图1和图2。
图1是所述光学指纹传感器模组的俯视示意图(图1中虚线部分代表位于下层的结构，可结合参考图2)。图2是所述光学指纹传感器模组的剖面示意图。图2所示的剖面为沿图1所示A-A点划线剖切所述光学指纹传感器模组得到的剖面。
请结合参考图1和图2，所述光学指纹传感器模组包括光学指纹传感器110和点状背光源120。
光学指纹传感器110有且只有一个透光基板111。透光基板111的第一表面(未标注)直接用于手指指纹接触。透光基板111的第二表面(未标注)具有器件层112。图2中，所述第一表面为透光基板111的上表面，所述第二表面为透光基板111的下表面。
本实施例中，透光基板111的厚度可以设置在5cm以下。透光基板111的材料可以为玻璃或塑料等。
请参考图2，器件层112具有像素区1120。图2中，像素区1120标注在两条长虚线之间，代表的是，在图2所示平面中，像素区1120位于器件层112中两条长虚线之间。而像素区1120下方的两条长虚线之间的区域，则为像素区1120正下方所在区域。本说明书其它实施例对应的剖面示意图中，对相应像素区的标注同样采用上述方法进行，在此一并说明。
图中虽未显示，但像素区1120呈矩形，像素区1120各边长的大小可以根据产品需要进行选择。
图中虽未显示，但像素区1120具有多个像素(未示出)，多个所述像素可以呈行列矩阵排布，所述像素行列之间可以设置有相应的数据线(未示出)和扫描线(未示出)等线路结构。一种具体的排布方式可以为：多条扫描线沿第一轴向排布，多条数据线沿第二轴向排 布的，扫描线和数据线限定出多个网格，所述像素位于网格中。其中，每个像素可以为矩形，矩形的每条边大小均小于或等于100μm。
图中虽未显示，但每个所述像素具有透光区域(未示出)和非透光区域(未示出)，所述非透光区域具有感光元件(未示出)，所述透光区域使光线能够透过所述器件层112的像素区1120。
需要说明的是，器件层112中，位于像素区1120周边的其它区域也可以设置有透光结构。即像素区1120以外的区域可以在保证制作相应结构和实现相应功能的基础上(例如需要在像素区1120周边区域制作驱动电路和绑定引脚等结构，以实现驱动和绑定等功能)，在像素区1120周边的部分区域上制作透光结构。
请参考图2，点状背光源120位于像素区1120正下方，点状背光源120和光学指纹传感器110之间具有间隔(此间隔为后续所述第三距离D3)，点状背光源120发出的光线与透光基板111的所述第一表面所成的夹角为直角或者接近于直角。其中，夹角接近于直角是指夹角为85°～90°之间。
本实施例中，点状背光源120位于器件层112下方，点状背光源120的出射光从所述透光区域穿过器件层112，再进入透光基板111。
请参考图2，点状背光源120为一个LED灯。所述LED灯(发出)的光可以为近紫外光、紫色光、蓝色光、绿色光、黄色光、红色光、近红外光或白色光。
请参考图2，点状背光源120发出的光线如图2中黑色单向箭头所示。图2显示的剖面中，在水平方向上，点状背光源120与像素区1120的正下方所在区域的左侧边缘具有第一距离D1(第一距离D1在图1中也有显示)，点状背光源120与像素区1120的正下方所在区域的右侧边缘具有第二距离D2(第二距离D2在图1中也有显示)，在竖直方向上，点状背光源120与整个光学指纹传感器110之间具有第三距离D3。
由上述可知，由于第一距离D1、第二距离D2和第三距离D3的存在，点状背光源120必然位于像素区1120的正下方。
本实施例中，可以通过调整第一距离D1、第二距离D2和第三距离D3的大小，使点状背光源120处于合适位置，从而提高光学指纹传感器模组所形成的指纹图像清晰度。
图中虽未显示，但本实施例中，一个像素还包括遮光层，所述感光元件位于所述遮光层与透光基板111之间，所述遮光层位于所述感光元件与点状背光源120之间。由于所述遮光层设置在相应位置，因此，所述感光元件只能接收从透光基板111进入器件层110的光信号，而点状背光源120的出射光不能从器件层110下方直接照射到所述感光元件。
其它实施例中，所述透光基板的所述第一表面和所述第二表面的至少其中一个表面可以具有滤光层。所述滤光层可以包括干涉反射层和光吸收层的至少其中之一。其中，干涉发射层可以增加有手指与无手指处的反射光差异，从而增加图像对比度，减小环境光对指纹图像的干扰，以减小环境光对指纹成像的影响。
其它实施例中，点状背光源可以包括两个或两个以上LED灯，两个或两个以上LED灯可以对称均匀地分布在光学指纹传感器的正下方，每个LED灯(发出)的光都可以为近紫外光、紫色光、蓝色光、绿色光、黄色光、红色光、近红外光或白色光。当点状背光源包括两个或两个以上LED灯时，每个LED灯的光可以都相同，也可以都不同，还可以部分LED灯的光相同，部分LED灯的光不同。
本实施例所提供的光学指纹传感器模组中，光学指纹传感器110仅包括一个透光基板111，此时，点状背光源120发出的光线在穿过光学指纹传感器110时，只需要穿过器件层112和一个透光基板111，因此，光线经过的基板较少，有助于形成清晰的指纹图像。同时，由于光学指纹传感器110结构简单，厚度减小，简化了光学指纹传感器模组的结构，降低了成本。此外，点状背光源120和光学指纹传感器 110之间具有间隔，且点状背光源120发出的光线与透光基板111的所述第一表面所成的夹角为直角或者接近于直角，到达所述第一表面的光线通常都能够按较小偏移量(或者零偏移量)在第一表面和手指指纹的界面发生反射，并使大部分有效反射光线照射到像素区1120中离相应反射点较近的像素中，因此，整个光学指纹传感器模组在不需要导光板的情况下，就能够准确实现指纹图像的识别，进一步提高了指纹图像的清晰度，并进一步简化光学指纹传感器模组的结构，降低了成本。
本发明第二实施例提供另一种光学指纹传感器模组，请参考图3。图3是所述光学指纹传感器模组的剖面示意图，所述光学指纹传感器模组包括光学指纹传感器210和点状背光源(未标注)。
请参考图3，光学指纹传感器210有且只有一个透光基板211。透光基板211的第一表面(未标注)直接用于手指指纹接触。透光基板211的第二表面(未标注)具有器件层212。在图3中，所述第一表面为透光基板211的上表面，所述第二表面为透光基板211的下表面。
本实施例中，器件层212具有像素区2120，像素区2120具有多个像素(未示出)，每个所述像素具有透光区域(未示出)和非透光区域(未示出)，所述非透光区域具有感光元件(未示出)，所述透光区域使光线能够透过所述器件层212的像素区2120。
请参考图3，点状背光源包括两个LED灯，分别为LED灯220和LED灯230。
本实施例中，LED灯220和LED灯230位于像素区2120的正下方，它们与光学指纹传感器210之间分别具有第三距离F3和第六距离F6。即所述点状背光源位于像素区2120的正下方，点状背光源和光学指纹传感器210之间具有间隔。
LED灯220和LED灯230与第一表面所成的夹角主要为直角或 者接近于直角。即点状背光源发出的光线与所述第一表面所成的夹角主要为直角或者接近于直角。
请参考图3，LED灯220和LED灯230发出的光线如图3中黑色单向箭头所示。LED灯220和LED灯230位于像素区2120的正下方，在图3所示俯视示意图中，LED灯220位于LED灯230的左侧。
图3显示的剖面中，在水平方向上，LED灯220与像素区2120正下方所在区域左侧边缘之间具有第一距离F1，LED灯220与像素区2120正下方所在区域右侧边缘之间具有第二距离F2。在竖直方向上，LED灯220与整个光学指纹传感器210之间具有第三距离F3。由上述可知，由于第一距离F1、第二距离F2和第三距离F3的存在，LED灯220必然位于像素区2120的正下方。
本实施例中，可以通过调整第一距离F1、第二距离F2和第三距离F3的大小，使LED灯220处于合适位置，从而提高光学指纹传感器模组所形成的指纹图像清晰度。
同样的，图3显示的剖面中，在水平方向上，LED灯230与像素区2120正下方所在区域左侧边缘之间具有第四距离F4，LED灯230与像素区2120正下方所在区域右侧边缘之间具有第五距离F5。在竖直方向上，LED灯230与整个光学指纹传感器210之间具有第六距离F6。由上述可知，由于第四距离F4、第五距离F5和第六距离F6的存在，LED灯230必然位于像素区2120的正下方。
本实施例中，可以通过调整第四距离F4、第五距离F5和第六距离F6的大小，使LED灯230处于合适位置，从而提高光学指纹传感器模组所形成的指纹图像清晰度。
本实施例中，LED灯220和LED灯230(发出)的光均可以为近紫外光、紫色光、蓝色光、绿色光、黄色光、红色光、近红外光或白色光。并且，两个LED灯的光可以相同，也可以不同。需要说明的是，其它实施例中，所述点状背光源包括三个或三个以上LED灯， 三个或三个以上LED灯可以对称均匀地分布在光学指纹传感器210的下方。例如，当所述点状背光源包括四个LED灯时，当像素区2120的俯视形状为矩形时，四个LED灯可以对称地分布在矩形像素区2120的四侧下方。其它实施例中，每个LED灯的光都可以为近紫外光、紫色光、蓝色光、绿色光、黄色光、红色光、近红外光或白色光，每个LED灯的光可以都相同，也可以都不同，还可以部分LED灯的光相同，部分LED灯的光不同。
需要说明的是，当所述点状背光源包括两个以上LED灯时(例如本实施例中具有LED灯220和LED灯230)，可以将全部LED灯中，离像素区2120最近的距离作为所述点状背光源到像素区2120的距离。
本实施例所提供的光学指纹传感器模组中，整个光学指纹传感器模组在不需要导光板的情况下，就能够实现指纹图像的识别，形成清晰的指纹图像，简化了光学指纹传感器模组的结构，降低了成本。同时，由于点状背光源包括LED灯220和LED灯230，因此，在进行指纹图像采集时，既可以选择任意一个LED灯的光线作为指纹图像的成像光线，又可以轮流利用两个LED灯发出的两组光线都进行成像，然后进行减噪和补偿等计算，从而得到清晰度和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
其它实施例中，当点状背光源包括更多LED灯时，同样可以轮流利用各个LED灯发出的各组光线都进行成像，然后进行减噪和补偿等计算，从而得到清晰度和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
更多有关本实施例所提供的光学指纹传感器模组的结构和性质，可参考前述实施例所提供的光学指纹传感器模组相应内容。
本发明第三实施例提供另一种光学指纹传感器模组，请参考图4，图4是所述光学指纹传感器模组的剖面示意图，所述光学指纹传感器模组包括光学指纹传感器310和点状背光源320。
请参考图4，光学指纹传感器310有且只有一个透光基板311。透光基板311的第一表面(未标注)直接用于手指指纹接触。透光基板311的第二表面(未标注)具有器件层312。在图4中，所述第一表面为透光基板311的上表面，所述第二表面为透光基板311的下表面。
本实施例中，器件层312具有像素区3120。像素区3120具有多个像素(未示出)，每个所述像素具有透光区域(未示出)和非透光区域(未示出)，所述非透光区域具有感光元件(未示出)，所述透光区域使光线能够透过所述器件层312的像素区3120。
请参考图4，点状背光源320位于像素区3120的下方，点状背光源320和光学指纹传感器310之间具有间隔(即点状背光源320与传感器310的器件层312的下表面的距离为第三距离G3)，点状背光源320发出的光线与透光基板311的所述第一表面所成的夹角为直角或者接近于直角。具体的，点状背光源320同样位于像素区3120的正下方，以保证上述夹角为直角或者接近于直角。
本实施例中，点状背光源320包括一个LED灯。本实施例中，点状背光源320发出的光线如图4中黑色单向箭头所示。由于点状背光源320位于像素区3120的正下方，因此，在图4所示剖面中，点状背光源320位于像素区3120的正下方。图4显示的剖面中，在水平方向上，点状背光源320与像素区3120正下方所在区域左边缘之间具有第一距离G1，点状背光源320与像素区3120正下方所在区域右边缘之间具有第二距离G2。在竖直方向上，点状背光源320与传感器310的器件层312的下表面之间具有第三距离G3。由上述可知，由于第一距离G1、第二距离G2和第三距离G3的存在，点状背光源320必然位于像素区3120的正下方。
本实施例中，可以通过调整第一距离G1、第二距离G2和第三距离G3的大小，使点状背光源320处于合适位置，从而提高光学指纹传感器模组所形成的指纹图像清晰度。
请参考图4，光学指纹传感器310靠近点状背光源320的表面还包括光增透层330，光增透层330能够增加点状背光源320的光线进入光学指纹传感器310的比例。
本实施例中，光增透层330直接层叠在器件层312表面上，从而减小了光学指纹传感器模组的厚度。
本实施例所提供的光学指纹传感器模组中，整个光学指纹传感器模组在不需要导光板的情况下，就能够实现指纹图像的识别，形成清晰的指纹图像，并且简化了光学指纹传感器模组的结构，降低了成本。同时，光学指纹传感器310靠近点状背光源320的表面还包括光增透层330，光增透层330能够增加点状背光源320的光线进入光学指纹传感器310的比例，因此，在进行指纹图像采集时，能够利用更多光线进行指纹图像的采集，从而得到清晰度和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
更多有关本实施例所提供的光学指纹传感器模组的结构和性质，可参考前述实施例所提供的光学指纹传感器模组相应内容。
本发明第四实施例提供另一种光学指纹传感器模组，请参考图5，图5是所述光学指纹传感器模组的剖面示意图，所述光学指纹传感器模组包括光学指纹传感器410和点状背光源420。
请参考图5，光学指纹传感器410有且只有一个透光基板411。透光基板411的第一表面(未标注)直接用于手指指纹接触。透光基板411的第二表面(未标注)具有器件层412。在图5中，所述第一表面为透光基板411的上表面，所述第二表面为透光基板411的下表面。
本实施例中，像素区4120具有多个像素(未示出)，每个所述像素具有透光区域(未示出)和非透光区域(未示出)，所述非透光区域具有感光元件(未示出)，所述透光区域使光线能够透过所述器件层412的像素区4120。
请参考图5，点状背光源420位于像素区4120的下方，点状背光源420和光学指纹传感器410之间具有间隔(第三距离H3)，点状背光源420发出的光线与透光基板411的所述第一表面所成的夹角为直角或者接近于直角。具体的，点状背光源420同样位于像素区4120的正下方，以保证上述夹角为直角或者接近于直角。
本实施例中，点状背光源420包括一个LED灯。点状背光源420发出的光线如图5中黑色单向箭头所示。图5显示的剖面中，在水平方向上，点状背光源420与像素区4120正下方所在区域左边缘之间具有第一距离H1，点状背光源420与像素区4120正下方所在区域右边缘之间具有第二距离H2。在竖直方向上，点状背光源420与传感器410的器件层412的下表面之间具有第三距离H3。由上述可知，由于第一距离H1、第二距离H2和第三距离H3的存在，点状背光源420必然位于像素区4120的正下方。
本实施例中，可以通过调整第一距离H1、第二距离H2和第三距离H3的大小，使点状背光源420处于合适位置，从而提高光学指纹传感器模组所形成的指纹图像清晰度。
请参考图5，点状背光源420的出光面前面具有聚光透镜430，聚光透镜430能够使点状背光源420的光线转换为平行光或近平行光，点状背光源420的光线先进入聚光透镜430，再进入光学指纹传感器410。
需要说明的是，所述近平行光指全部光线之间的最大角度差异在10度以内。
本实施例中，所述聚光透镜430为凸透镜，此时，当点状背光源420离聚光透镜430的距离恰好等于凸透镜的焦距时，通过聚光透镜430的光均被调整为平行光。其它实施例中，所述聚光透镜430也可以为其它适合透镜，例如菲涅尔透镜。
本实施例所提供的光学指纹传感器模组中，整个光学指纹传感器 模组在不需要导光板的情况下，就能够实现指纹图像的识别，形成清晰的指纹图像，并且简化了光学指纹传感器模组的结构，降低了成本。同时，在点状背光源420的出光面前面设置聚光透镜430，聚光透镜430能够使点状背光源420的光线转换为平行光或近平行光，点状背光源420的光线先进入聚光透镜430，再进入光学指纹传感器410，因此，在进行指纹图像采集时，能够利用平行光线或者近平行光线进行指纹图像的采集，从而得到更小畸变量和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
更多有关本实施例所提供的光学指纹传感器模组的结构和性质，可参考前述实施例所提供的光学指纹传感器模组相应内容。
本发明第五实施例提供另一种光学指纹传感器模组，请参考图6，图6是所述光学指纹传感器模组的剖面示意图，所述光学指纹传感器模组包括光学指纹传感器510和点状背光源(未标注)。
请参考图6，光学指纹传感器510有且只有一个透光基板511。透光基板511的第一表面(未标注)直接用于手指指纹接触。透光基板511的第二表面(未标注)具有器件层512。在图6中，所述第一表面为透光基板511的上表面，所述第二表面为透光基板511的下表面。
本实施例中，器件层512具有像素区5120。像素区5120具有多个像素(未示出)，每个所述像素具有透光区域(未示出)和非透光区域(未示出)，所述非透光区域具有感光元件(未示出)，所述透光区域使光线能够透过所述器件层512的像素区5120。
请参考图6，所述点状背光源位于像素区5120的下方，所述点状背光源发出的光线与透光基板511的第一表面所成的夹角为直角或者接近于直角。具体的，所述点状背光源同样位于像素区5120的正下方。
本实施例中，所述点状背光源包括LED灯520和LED灯530。 LED灯520和LED灯530位于像素区5120的下方，LED灯520和LED灯530发出的光线与所述第一表面的上表面所成的夹角为直角或者接近于直角。
本实施例中，所述点状背光源发出的光线如图6中黑色单向箭头所示。图6显示的剖面中，在水平方向上，LED灯520与像素区5120正下方所在区域左侧边缘之间具有第一距离I1，LED灯520与像素区5120正下方所在区域右侧边缘之间具有第二距离I2。在竖直方向上，LED灯520与传感器510的器件层512的下表面之间具有第三距离I3。由上述可知，由于第一距离I1、第二距离I2和第三距离I3的存在，LED灯520必然位于像素区5120的正下方。
本实施例中，可以通过调整第一距离I1、第二距离I2和第三距离I3的大小，使LED灯520处于合适位置，从而提高光学指纹传感器模组所形成的指纹图像清晰度。
同样的，图6显示的剖面中，在水平方向上，LED灯530与像素区5120正下方所在区域左侧边缘之间具有第四距离I4，LED灯530与像素区5120正下方所在区域右侧边缘之间具有第五距离I5。在竖直方向上，LED灯530与传感器510的器件层512的下表面之间具有第六距离I6。由上述可知，由于第四距离I4、第五距离I5和第六距离I6的存在，LED灯530必然位于像素区5120的正下方。
第四距离I4、第五距离I5和LED灯530自身宽度的总和，总是等于像素区5120的其中一条边长(可参考图1中的边长E1)。本实施例中，可以通过调整第四距离I4、第五距离I5和第六距离I6的大小，使LED灯530处于合适位置，从而提高光学指纹传感器模组所形成的指纹图像清晰度。
与前述实施例不同的，如图6，本实施例中，LED灯520与光学指纹传感器510之间具有聚光透镜540，LED灯530与光学指纹传感器510之间具有聚光透镜550。即，LED灯520的出光面前面具有聚光透镜540，聚光透镜540能够使LED灯520的光线转换为平行光 或近平行光，LED灯520的光线先进入聚光透镜540，再进入光学指纹传感器510。LED灯530的出光面前面具有聚光透镜550，聚光透镜550能够使LED灯530的光线转换为平行光或近平行光，LED灯530的光线先进入聚光透镜550，再进入光学指纹传感器510。
本实施例所提供的光学指纹传感器模组中，整个光学指纹传感器模组在不需要导光板的情况下，就能够实现指纹图像的识别，形成清晰的指纹图像，简化了光学指纹传感器模组的结构，降低了成本。同时，LED灯520和LED灯530的出光面前面分别设置聚光透镜540和聚光透镜550，聚光透镜540和聚光透镜550能够分别使LED灯520和LED灯530的光线转换为平行光或近平行光，LED灯520和LED灯530的光线先进入相应的聚光透镜，再进入光学指纹传感器510，因此，在进行指纹图像采集时，能够利用平行光线或者近平行光线进行指纹图像的采集，从而得到更小畸变量和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
本发明第六实施例提供另一种光学指纹传感器模组，请参考图7，图7是所述光学指纹传感器模组的剖面示意图，所述光学指纹传感器模组包括光学指纹传感器610和点状背光源620。
请参考图7，光学指纹传感器610有且只有一个透光基板611。透光基板611的第一表面(未标注)直接用于手指指纹接触。透光基板611的第二表面(未标注)具有器件层612。在图7中，所述第一表面为透光基板611的上表面，所述第二表面为透光基板611的下表面。
请参考图7，器件层612具有像素区6120。像素区6120具有多个像素(未示出)，每个所述像素具有透光区域(未示出)和非透光区域(未示出)，所述非透光区域具有感光元件(未示出)，所述透光区域使光线能够透过所述器件层612的像素区6120。
请参考图7，点状背光源620位于像素区6120的下方，点状背光源620和光学指纹传感器610之间具有间隔(第三距离J3)，点状 背光源620发出的光线与透光基板611的所述第一表面所成的夹角为直角或者接近于直角。具体的，点状背光源620同样位于像素区6120的正下方，以保证上述夹角为直角或者接近于直角。
本实施例中，点状背光源620发出的光线如图7中黑色单向箭头所示。图7显示的剖面中，在水平方向上，点状背光源620与像素区6120的正下方所在区域左侧边缘之间具有第一距离J1，点状背光源620与像素区6120的正下方所在区域右侧边缘之间具有第二距离J2；在竖直方向上，点状背光源620与传感器610的器件层612的下表面之间具有第三距离J3。由上述可知，由于第一距离J1、第二距离J2和第三距离J3的存在，点状背光源620必然位于像素区6120的正下方。
本实施例中，可以通过调整第一距离J1、第二距离J2和第三距离J3的大小，使点状背光源620处于合适位置，从而提高光学指纹传感器模组所形成的指纹图像清晰度。
与前述实施例不同的，如图7，本实施例中，光学指纹传感器610和点状背光源620之间还包括透光介质层630，点状背光源620发出的光线先进入透光介质层630，然后再进入光学指纹传感器610。透光介质层630的折射率总是大于空气的折射率的，并且透光介质层630的下表面为聚光面(图7中未标注)。本实施例中，透光介质层630的聚光面能够使点状背光源620的光线转换为平行光或近平行光，点状背光源620的光线先进入透光介质层630，再进入光学指纹传感器610，因此，在进行指纹图像采集时，能够利用平行光线或者近平行光线进行指纹图像的采集，从而得到更小畸变量和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
需要特别说明的是，尽管本实施例中，整个光学指纹传感器模组包括了透光介质层630，但是，光学指纹传感器610本身仍然有且仅有一个透光基板611。此时，光学指纹传感器610仍然是简化的结构，即透光介质层630是设置在光学指纹传感器610和点状背光源620之 间的结构，不构成光学指纹传感器610的一部分。
本实施例中，可以进一步选择透光介质层630的折射率在1.2以上，从而更进一步提高光学指纹传感器模组的性能。
本实施例中，透光介质层630的材料可以具体为玻璃层、塑料层或者光学胶层。
本实施例中，透光介质层630的所述聚光面为椭球冠面。其它实施例中，透光介质层630的所述聚光面也可以为斜面、球冠面、圆锥侧表面或者棱锥侧表面等。
需要说明的是，图中虽未显示，但本实施例中，在光学指纹传感器610和透光介质层630之间还可以具有第二光学胶层，点状背光源620发出的光线从透光介质层630先进入所述第二光学胶层，再从第二光学胶层进入光学指纹传感器610。第二光学胶层可以避免光学指纹传感器610和透光介质层630之间存在空气，进而防止光线在光学指纹传感器610和透光介质层630之间的空气中发生散射和折射，从而提高后续指纹图像的质量。
更多有关本实施例所提供的光学指纹传感器模组的结构和性质，可参考前述实施例所提供的光学指纹传感器模组相应内容。
本发明第七实施例提供另一种光学指纹传感器模组，请参考图8，图8是所述光学指纹传感器模组的剖面示意图，所述光学指纹传感器模组包括光学指纹传感器710和点状背光源720。
请参考图8，光学指纹传感器710有且只有一个透光基板711。透光基板711的第一表面(未标注)直接用于手指指纹接触。透光基板711的第二表面(未标注)具有器件层712。在图8中，所述第一表面为透光基板711的上表面，所述第二表面为透光基板711的下表面。
请参考图8，器件层712具有像素区7120，像素区7120具有多个像素(未示出)，每个所述像素具有透光区域(未示出)和非透光 区域(未示出)，所述非透光区域具有感光元件(未示出)，所述透光区域使光线能够透过所述器件层712的像素区7120。
请参考图8，点状背光源720位于像素区7120的下方，点状背光源720和光学指纹传感器710之间具有间隔(与传感器710的器件层712的下表面的距离为第三距离K3)，点状背光源720发出的光线与透光基板711的所述第一表面所成的夹角为直角或者接近于直角。具体的，点状背光源720同样位于像素区7120的正下方，以保证上述夹角为直角或者接近于直角。
本实施例中，点状背光源720发出的光线如图8中黑色单向箭头所示。图8显示的剖面中，在水平方向上，点状背光源720与像素区7120的正下方所在区域左侧边缘之间具有第一距离K1，点状背光源720与像素区7120的正下方所在区域右侧边缘之间具有第二距离K2；在竖直方向上，点状背光源720与传感器710的器件层712的下表面之间具有第三距离K3。由上述可知，由于第一距离K1、第二距离K2、和第三距离K3的存在，点状背光源620必然位于像素区6120的正下方。
本实施例中，可以通过调整第一距离K1、第二距离K2、和第三距离K3的大小，使点状背光源620处于合适位置，从而提高光学指纹传感器模组所形成的指纹图像清晰度。
请参考图8，光学指纹传感器710和点状背光源720之间还包括透光介质层730，点状背光源720发出的光线先进入透光介质层730，然后再进入光学指纹传感器710。
本实施例中，可以进一步选择透光介质层730的折射率在1.2以上，从而更进一步提高光学指纹传感器模组的性能。透光介质层730的材料可以具体为玻璃层、塑料层或者光学胶层。
本实施例中，透光介质层730的所述下表面为聚光面(图8中未标注)，点状背光源720发出的光线从所述聚光面进入透光介质层 730，所述聚光面将点状背光源720发出的光线转换为平行光或近平行光。
请参考图8，透光介质层730的所述聚光面上(具体在下表面上)还具有光增透层740，光增透层740能够增加点状背光源720的光线进入透光介质层的比例，因此，在进行指纹图像采集时，能够利用更多光线进行指纹图像的采集，从而得到清晰度和准确度更高的指纹图像，进一步提高光学指纹传感器模组的性能。
更多有关本实施例所提供的光学指纹传感器模组的结构和性质，可参考前述实施例所提供的光学指纹传感器模组相应内容。
虽然本发明披露如上，但本发明并非限定于此。任何本领域技术人员，在不脱离本发明的精神和范围内，均可作各种更动与修改，因此本发明的保护范围应当以权利要求所限定的范围为准。

Claims (12)

  1. 一种光学指纹传感器模组，包括：
    光学指纹传感器；
    点状背光源；
    其特征在于：
    所述光学指纹传感器有且只有一个透光基板；
    所述透光基板的第一表面直接用于手指指纹接触；
    所述透光基板的第二表面具有器件层；
    所述器件层具有像素区；所述像素区具有多个像素；每个所述像素具有透光区域和非透光区域；所述非透光区域具有感光元件；所述透光区域使光线能够透过所述器件层的所述像素区；
    所述点状背光源位于所述像素区正下方，所述点状背光源和所述光学指纹传感器之间具有间隔，所述点状背光源发出的光线与所述透光基板的所述第一表面所成的夹角为直角或者接近于直角。
  2. 如权利要求1所述的光学指纹传感器模组，其特征在于，所述点状背光源位于所述器件层下方，所述点状背光源的出射光从所述透光区域穿过所述器件层，再进入所述透光基板。
  3. 如权利要求1或2所述的光学指纹传感器模组，其特征在 于，一个所述像素还包括遮光层，所述感光元件位于所述遮光层与所述透光基板之间，所述遮光层位于所述感光元件与所述点状背光源之间。
  4. 如权利要求1或2所述的光学指纹传感器模组，其特征在于，所述点状背光源包括至少一个LED灯，所述LED灯的光为近紫外光、紫色光、蓝色光、绿色光、黄色光、红色光、近红外光或白色光；或者，所述点状背光源包括两个或两个以上LED灯，所述两个或两个以上LED灯对称地分布在所述光学指纹传感器的正下方，所述LED灯的光为近紫外光、紫色光、蓝色光、绿色光、黄色光、红色光、近红外光或白色光。
  5. 如权利要求1所述的光学指纹传感器模组，其特征在于，所述点状背光源的出光面前面具有聚光透镜，所述聚光透镜能够使所述点状背光源的光线转换为平行光或近平行光，所述点状背光源的光线先进入所述聚光透镜，再进入所述光学指纹传感器。
  6. 如权利要求1所述的光学指纹传感器模组，其特征在于，所述器件层的表面还包括光增透层，所述光增透层能够增加所述点状背光源的光线进入所述光学指纹传感器的比例。
  7. 如权利要求1所述的光学指纹传感器模组，其特征在于，所述光学指纹传感器和所述点状背光源之间还包括透光介质层，所述点状背光源发出的光线先进入所述透光介质层，然后再进入所述光学指纹传感器。
  8. 如权利要求7所述的光学指纹传感器模组，其特征在于，所述透光介质层的下表面做为聚光面，所述点状背光源发出的光线从所述聚光面进入所述透光介质层，所述聚光面将所述点状背光源发出的光线转换为平行光或近平行光。
  9. 如权利要求7或8所述的光学指纹传感器模组，其特征在于，所述透光介质层的所述下表面上还具有光增透层，所述光增透层能够增加所述点状背光源的光线进入所述透光介质层的比例。
  10. 如权利要求8所述的光学指纹传感器模组，其特征在于，所述透光介质层为玻璃层、塑料层或者光学胶层；所述透光介质层的所述聚光面为斜面、球冠面、椭球冠面、圆锥侧面或者棱锥侧面。
  11. 如权利要求7、8或10所述的光学指纹传感器模组，其特征在于，所述透光介质层的折射率为1.2以上。
  12. 如权利要求1所述的光学指纹传感器模组，其特征在于，所述透光基板的所述第一表面和所述第二表面的至少其中一个表面具有滤光层。
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