CN104063704B - Image acquisition device, liquid crystal terminal equipment, fingerprint and image acquisition method - Google Patents
Image acquisition device, liquid crystal terminal equipment, fingerprint and image acquisition method Download PDFInfo
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- CN104063704B CN104063704B CN201410281377.9A CN201410281377A CN104063704B CN 104063704 B CN104063704 B CN 104063704B CN 201410281377 A CN201410281377 A CN 201410281377A CN 104063704 B CN104063704 B CN 104063704B
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- 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
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Abstract
The invention discloses an image acquisition device, liquid crystal terminal equipment, a fingerprint acquisition method and an image acquisition method. The invention is based on the pinhole imaging principle, can form an ultrathin fingerprint acquisition instrument with any size, and can be further combined with a liquid crystal display screen to realize the fingerprint acquisition function; or forming an ultrathin image acquisition device for acquiring the image of the general target. The liquid crystal terminal equipment comprises a liquid crystal display assembly, wherein the liquid crystal display assembly at least comprises a liquid crystal panel and a backlight module; the backlight module at least comprises a reflector plate and a back plate, wherein one or more imaging holes are formed in the reflector plate and/or the back plate, and photoelectric conversion sensors are arranged at positions corresponding to the imaging holes. According to the invention, the structure of the liquid crystal display screen is improved according to the pinhole imaging principle, so that the liquid crystal display screen can collect fingerprints, and the terminal equipment is supported to finish operations of screen unlocking, account verification and the like which require personal identity authentication by utilizing fingerprint identification.
Description
Technical Field
The invention relates to an image acquisition device, liquid crystal terminal equipment, a fingerprint used for a liquid crystal panel and an image acquisition method.
Background
At present, there are two main methods for collecting fingerprints and images. One is based on the direct fingerprint collection of the semiconductor chip; one is an optical acquisition method based on the total reflection principle. Both methods have their advantages and disadvantages. The traditional optical fingerprint acquisition equipment has large size and is difficult to meet the requirements of mobile equipment on thickness, size and the like; the fingerprint collecting method of the semiconductor chip has the defects of insufficient antistatic and corrosion resistance and the like.
The camera is a common device and has important application in various industries. A camera is generally composed of an optical lens group, a shutter device, a photosensitive member (e.g., a film, a digital image sensor, etc.), and the like. In many cases, cameras of small size and thin thickness are required, for example, in-pipe inspection, internal state monitoring of complex equipment or production lines. Conventional cameras are large in size and cannot meet these requirements.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an image collecting device, a collector, a liquid crystal terminal device, and a fingerprint collecting method for a liquid crystal panel, so that the size and thickness of a fingerprint collecting module in the device can be greatly reduced, and great convenience is provided for the device appearance and software interface design.
In order to achieve the above object, the liquid crystal terminal device of the present invention includes a liquid crystal display module, the liquid crystal display module at least includes a liquid crystal panel, a camera module or a collector is disposed in the liquid crystal terminal device at a position corresponding to the liquid crystal panel, and the camera module or the collector collects a fingerprint on the other side of the liquid crystal panel through the liquid crystal panel in a light-transmitting state of the liquid crystal panel.
In order to achieve the above object, the liquid crystal terminal device of the present invention comprises a liquid crystal display module, wherein the liquid crystal display module at least comprises a liquid crystal panel and a backlight module, wherein a camera assembly or a collector is disposed in the backlight module corresponding to the liquid crystal panel, and the camera assembly or the collector collects a fingerprint on the other side of the liquid crystal panel through the liquid crystal panel in a light-transmitting state of the liquid crystal panel.
In order to achieve the above object, the liquid crystal terminal device of the present invention comprises a liquid crystal display module, wherein the liquid crystal display module at least comprises a liquid crystal panel and a backlight module;
the backlight module at least comprises a reflector plate and/or a back plate and one or more layers of optical diaphragms arranged between the reflector plate and/or the back plate and the liquid crystal plate;
a through hole is arranged on the reflector plate and/or the back plate, and a camera shooting assembly or a collector is arranged behind the through hole;
each layer of optical film is at least provided with a light-transmitting part at the position corresponding to the through hole;
the camera shooting assembly or the collector can penetrate through the through hole, the light transmission part on the optical diaphragm and the fingerprint on the other side of the liquid crystal panel when the liquid crystal panel is in a light transmission state.
To achieve the above object, the present invention provides a liquid crystal display device, comprising a liquid crystal display module,
the liquid crystal display assembly at least comprises a liquid crystal panel and a backlight module;
the backlight module at least comprises a reflector plate and/or a back plate and one or more layers of optical diaphragms arranged between the reflector plate and/or the back plate and the liquid crystal plate;
an imaging hole is formed in the reflector plate and/or the back plate corresponding to the light transmission part, photoelectric conversion sensors are arranged behind the backlight module at intervals corresponding to the imaging hole, and the photoelectric conversion sensors are matched with the imaging hole to form a collector;
a light-transmitting part is arranged on each layer of optical film at least at the position corresponding to the imaging hole;
the collector can collect the fingerprint on the other side of the liquid crystal panel through the light-transmitting part on the optical diaphragm and the liquid crystal panel in the light-transmitting state of the liquid crystal panel.
To achieve the above object, the present invention provides a liquid crystal display device, comprising a liquid crystal display module,
the liquid crystal display assembly at least comprises a liquid crystal panel and a backlight module;
the backlight module at least comprises a reflector plate and/or a back plate and one or more layers of optical diaphragms arranged between the reflector plate and/or the back plate and the liquid crystal plate;
the backlight module is characterized in that a plurality of imaging holes are formed in the reflector plate and/or the back plate, a photoelectric conversion sensor is arranged behind the backlight module and corresponds to each imaging hole, each photoelectric conversion sensor and the corresponding imaging hole are arranged at intervals, and the photoelectric conversion sensors and the corresponding imaging holes are matched to form a collector;
a light-transmitting part is arranged on each layer of optical film at least at the position corresponding to the imaging hole;
the collector can collect the fingerprint on the other side of the liquid crystal panel through the light-transmitting part on the optical diaphragm and the liquid crystal panel in the light-transmitting state of the liquid crystal panel.
To achieve the above object, the present invention provides a liquid crystal display device, comprising a liquid crystal display module,
the liquid crystal display assembly at least comprises a liquid crystal panel and a backlight module;
the backlight module at least comprises a reflector plate and/or a back plate and one or more layers of optical diaphragms arranged between the reflector plate and/or the back plate and the liquid crystal plate;
a plurality of imaging holes are arranged on the reflector plate and/or the back plate, each imaging hole corresponds to different areas of the same fingerprint, and the fingerprint areas corresponding to any two adjacent imaging holes are mutually overlapped; one or more photoelectric conversion sensors are arranged behind the backlight module at intervals corresponding to the plurality of imaging holes, and the photoelectric conversion sensors are matched with the plurality of imaging holes to form a collector;
a light-transmitting part is arranged on each layer of optical film at least at the position corresponding to the imaging hole;
the collector can collect the fingerprint on the other side of the liquid crystal panel through the light-transmitting part on the optical diaphragm and the liquid crystal panel in the light-transmitting state of the liquid crystal panel.
Preferably, the device further comprises a control device, and the control device controls the photoelectric conversion sensor to collect fingerprints and images corresponding to each imaging hole one by one.
Preferably, the device further comprises a control device, and the control device controls the liquid crystal panel to open the liquid crystal panels of the fingerprints and the images corresponding to the imaging holes one by one.
Preferably, the aperture of the imaging aperture is 0.001-1 mm.
Preferably, a filter is additionally arranged between the imaging hole and the photoelectric conversion sensing area or between the imaging hole and the liquid crystal panel.
Preferably, a correction lens is added on either side or both sides of the imaging aperture.
In order to achieve the above purpose, the fingerprint and image acquisition method of the invention comprises the following steps:
responding a control signal to enable the liquid crystal panel to be in a light transmission state;
the fingerprint of the other side of the liquid crystal panel is collected by a camera device or a collector at one side of the liquid crystal panel.
Preferably, the collecting the fingerprint or the image on the other side of the liquid crystal panel by a camera device or a collector on one side of the liquid crystal is specifically:
establishing a plurality of scanning areas aiming at the same fingerprint, and enabling adjacent scanning areas to be mutually overlapped;
taking images of fingerprints corresponding to each scanning area one by one;
and splicing the fingerprints and images obtained by scanning to obtain complete fingerprints and images.
Preferably, the first and second electrodes are formed of a metal,
establishing a plurality of scanning areas aiming at the same fingerprint, and enabling adjacent scanning areas to be mutually overlapped;
responding a control signal to enable the liquid crystal boards corresponding to the scanning areas to be in a light transmission state one by one;
the fingerprints and images corresponding to the scanning areas are acquired one by one,
and splicing the obtained fingerprints and images to obtain complete fingerprints and images.
Preferably, the first and second electrodes are formed of a metal,
establishing a plurality of scanning areas aiming at the same fingerprint, and enabling adjacent scanning areas to be mutually overlapped;
responding a control signal to enable the liquid crystal plate for the fingerprint to be in a light transmission state;
the fingerprints and images corresponding to the scanning areas are acquired one by one,
and splicing the obtained fingerprints and images to obtain complete fingerprints and images.
In order to achieve the purpose, the collector is the collector, and comprises a panel with one or more imaging holes, and photoelectric conversion sensors are arranged at intervals corresponding to the positions of the imaging holes.
Preferably, the collector comprises a box body, the imaging hole is arranged on the front side panel of the box body, and the photoelectric conversion sensor is arranged at the bottom of the box body corresponding to the imaging hole.
The invention has the beneficial effects that:
1. the invention utilizes the pinhole imaging principle to carry out imaging collection on the fingerprint, and compared with the traditional total reflection type optical fingerprint collection instrument, the thickness of the fingerprint collection instrument can be greatly reduced, thereby being conveniently integrated into mobile terminal equipment with harsh requirements on the thickness. In the fingerprint imaging collection process, the whole fingerprint effective collection part can be collected at one time, and can be collected one by one, so that the fingerprints and images can be conveniently and clearly collected.
2. The method can improve the structure of the liquid crystal display screen according to the pinhole imaging principle, so that the liquid crystal display screen can collect fingerprints and support screen unlocking and other operations. The method provides great convenience for the appearance and software interface design of electronic equipment such as mobile phones and the like, and simultaneously meets the delicate requirements of the electronic equipment on thickness and size. In addition, the method can be used in fingerprint identification equipment required by any field.
3. The invention can be used on any type of liquid crystal display terminal to provide a new fingerprint acquisition and identification function. Here, the liquid crystal display terminal includes products such as a tablet computer, a notebook, a mobile phone, an advertisement liquid crystal panel, an MP3 player, and the like.
4. The invention collects images by using the pinhole imaging principle, replaces a complex optical lens, and ensures that the thickness and the volume of the image collecting device are smaller.
5. The invention utilizes the pinhole imaging principle to collect images, can reduce the thickness of the image collecting device to several millimeters, and meets the requirement of ultra-thinning the image collecting device.
Drawings
Fig. 1 is a schematic structural diagram of a collector in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a collector in embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a collector according to embodiment 3 of the present invention;
fig. 4 is an application schematic diagram of a collector according to embodiment 4 of the present invention;
fig. 5 is an application schematic diagram of a collector according to embodiment 5 of the present invention;
fig. 6 is a schematic structural diagram of a liquid crystal terminal device according to embodiment 6 of the present invention;
fig. 7 is a schematic structural diagram of a liquid crystal terminal device according to embodiment 7 of the present invention;
fig. 8 is a schematic structural diagram of a liquid crystal terminal device according to embodiment 8 of the present invention;
fig. 9 is a schematic structural diagram of a liquid crystal terminal device according to embodiment 9 of the present invention;
fig. 10 is a schematic structural diagram of a liquid crystal terminal device according to embodiment 10 of the present invention;
fig. 11 is a schematic structural diagram of a liquid crystal terminal device according to embodiment 11 of the present invention;
fig. 12 is a schematic structural diagram of a liquid crystal terminal device according to embodiment 12 of the present invention;
fig. 13 is a schematic structural diagram of a liquid crystal terminal device according to embodiment 13 of the present invention;
fig. 14 is a schematic structural diagram of a liquid crystal terminal device according to embodiment 14 of the present invention.
FIG. 15 is a schematic view of fingerprint images acquired through different apertures during multi-aperture imaging;
figure 16 is a completed fingerprint image after stitching of the images shown in figure 15.
Fig. 17 is a schematic structural diagram of an image capturing device according to embodiment 18 of the present invention;
fig. 18 is a schematic structural diagram of an image capturing device according to embodiment 19 of the present invention;
fig. 19 is a schematic structural diagram of an image capturing device according to embodiment 20 of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings.
The collector of the invention is explained below with reference to the following embodiments:
example 1:
as shown in fig. 1, the collector includes a panel 1 with at least one imaging hole 2, and photoelectric conversion sensors 3 are disposed at intervals corresponding to the positions of the imaging holes. As shown in the figure, by using the principle of pinhole imaging, the fingerprint can be imaged on the photoelectric conversion sensor through the imaging hole, thereby completing the collection of the fingerprint corresponding to the imaging hole. The photoelectric conversion sensor can adopt a photosensitive element such as a CMOS or CCD and the like for collecting fingerprints. Fig. 1 shows the basic principle on which the invention is based.
Example 2:
this example is based on example 1: a transparent panel is added.
As shown in fig. 2, for some specific devices, a transparent panel 4 may be used to provide a touch surface for the finger, facilitating fingerprint acquisition at a fixed resolution.
Example 3:
as shown in fig. 3, the collector comprises a box body 13, the imaging hole is arranged on the front side panel 14 of the box body, and the photoelectric conversion sensor 3 is arranged at the bottom of the box body corresponding to the imaging hole 2.
The collector can be applied to various terminal devices. In application, the collector can be used as an independent module to collect fingerprints. In each embodiment, the aperture of the imaging hole can be 0.001-1 mm; the aperture of the imaging aperture is preferably selected to be between 0.01 and 0.2mm, such as 0.1mm, for optimal imaging and shorter imaging distance and processing.
Example 4:
as shown in fig. 4, in the device according to this embodiment, the collector 5 is used at the edge of the terminal device 6, such as a mobile phone, which can be on the HOME key. Compared with the common camera shooting assembly, the collector has the characteristics of simple structure, small thickness and the like.
Example 5:
as shown in fig. 5, this embodiment is different from embodiment 3 in that: the collector 5 is an independent device and is connected with the terminal equipment 6 through a wire and an interface.
The liquid crystal terminal equipment of the invention collects fingerprints and images through the liquid crystal panel by the collector or the camera shooting assembly under the light transmission state of the liquid crystal panel. The liquid crystal panel is a panel body formed by upper and lower glass panels and liquid crystal molecules between the two panels. The liquid crystal panel is transparent in a specific state, and can be regarded as a transparent panel. When collecting the fingerprint, the finger is pressed on the surface of the liquid crystal display screen, and the collector or the camera shooting component is placed on the other side (back side) of the liquid crystal display screen.
The liquid crystal terminal device of the present invention is explained below with reference to the embodiments:
the liquid crystal terminal equipment comprises a tablet personal computer, a notebook computer, a mobile phone, an advertising liquid crystal panel, an MP3 player, a liquid crystal display, a liquid crystal television and other terminal equipment with a liquid crystal panel.
Example 6:
the liquid crystal terminal device according to this embodiment includes a liquid crystal display module, as shown in fig. 6, the liquid crystal display module at least includes a liquid crystal panel 9, a camera module or a collector 5 is disposed in parallel at a position corresponding to the liquid crystal panel in the liquid crystal terminal device, and the camera module or the collector collects a fingerprint on the other side of the liquid crystal panel through the liquid crystal panel in a light-transmitting state of the liquid crystal panel.
Example 7:
the liquid crystal terminal device of this embodiment includes a liquid crystal display module, the liquid crystal display module is composed of a liquid crystal panel and a backlight module at least, wherein a camera shooting module or a collector is disposed in the back panel module at a position corresponding to the liquid crystal panel. Generally, the backlight module includes a back plate, a reflective sheet, and one or more optical films between the reflective sheet and the liquid crystal panel. Therefore, each optical film is provided with a light-transmitting portion at least at a position corresponding to the image pickup element or the collector. The light-transmitting part is arranged to prevent the optical film from influencing the fingerprint acquisition process when the optical film is not easy to transmit light or is not transparent. When any one of the optical films is totally transparent, the optical film is a transparent part. When any optical film is not easy to transmit light or not, the light transmission part on the optical film can be a light transmission hole or a light transmission piece.
The camera shooting assembly or the collector described in this embodiment can be independent devices capable of collecting fingerprints. For example, the camera module may be various camera modules on existing mobile phones and tablet computers. The collector may be any one of the collectors described in embodiments 1-5 above. As shown in fig. 7, the backlight module at least includes a reflector 8 and a back plate 7 (optical film is omitted in the figure), and therefore, as shown in the figure, the camera assembly or the collector is placed at a position above the reflector 4.
Example 8:
this embodiment is different from embodiment 7 in that: as shown in fig. 8, the backlight module at least comprises a reflective sheet 8, a back plate 7, and one or more optical films disposed between the reflective sheet and the liquid crystal panel, wherein the reflective sheet and the back plate are attached to each other. The reflector plate is provided with a through hole 10, a concave part is arranged on the back plate and corresponds to the through hole, and the camera shooting assembly or the collector 5 is fixed in the concave part. The camera shooting assembly or the collector collects fingerprints on the other side of the liquid crystal panel through the through hole, the light transmission part on the optical diaphragm and the liquid crystal panel in the light transmission state of the liquid crystal panel.
Example 9:
the present embodiment is different from embodiment 8 in that: as shown in fig. 9, the backlight module includes at least a reflector 8, a back plate 7, and a polarizer 16 (other optical films are not shown), and a light-transmitting portion is provided on the polarizer. A through hole 10 is arranged on the reflector plate and the back plate. The camera shooting assembly or the collector 5 is arranged behind the back plate and corresponds to the through hole. The size of the through hole is larger than the size of a lens of the camera shooting assembly and the size of an imaging hole of the collector. The camera shooting assembly or the collector collects fingerprints on the other side of the liquid crystal panel through the through hole, the light transmission part on the optical diaphragm and the liquid crystal panel in the light transmission state of the liquid crystal panel.
Example 10:
the liquid crystal display terminal device according to this embodiment includes a liquid crystal display module, and as shown in fig. 10, the liquid crystal display module is provided with at least a glass protective layer 12, a touch panel 11, a liquid crystal panel 9, one or more layers of optical films 15, a reflective sheet 8, a photoelectric conversion sensor 3, and a back plate 7 in this order from top to bottom. Each optical film is provided with a light-transmitting portion. The structure can be made into most of the existing terminal equipment, such as touch mobile phones, tablet computers and the like.
In this embodiment, the photoelectric conversion sensor 3 is disposed between the reflector plate and the back plate, and the reflector plate is provided with an imaging hole 2, which is disposed corresponding to the light-transmitting portion of the optical diaphragm. In actual processing, a concave portion may be provided on the back plate so that the photoelectric conversion sensor is located in the concave portion. The photoelectric conversion sensor collects the fingerprint on the other side of the liquid crystal panel through the imaging hole, the light transmission part on the optical diaphragm and the liquid crystal panel in the light transmission state of the liquid crystal panel.
Example 11:
a liquid crystal display device according to this embodiment includes a liquid crystal display module, as shown in fig. 11, which at least includes, from top to bottom, a glass protective layer 12, a touch panel 11, a liquid crystal panel 9, one or more layers of optical films 15, a reflective sheet 8, a back plate 7, and a photoelectric conversion sensor 3. Each optical film is provided with a light-transmitting portion. Typically, the reflective sheet 8 and the back plate 7 are bonded together. Therefore, the reflector and the back plate need to be provided with imaging holes 2, which are arranged corresponding to the light-transmitting portions of the optical film. By such design, the photoelectric conversion sensor 3 is arranged below the back plate 7 and is arranged corresponding to the imaging hole. The photoelectric conversion sensor collects the fingerprint on the other side of the liquid crystal panel through the imaging hole, the light transmission part on the optical diaphragm and the liquid crystal panel in the light transmission state of the liquid crystal panel.
A common drawback of pinhole imaging is that the central area facing the pinhole is generally of higher brightness and clarity, while the peripheral areas away from the pinhole are of lower brightness and clarity. Therefore, the invention makes up the defect by a multi-hole imaging method and improves the imaging quality. The specific method is shown in the following examples.
Example 12:
a liquid crystal terminal device according to the present embodiment includes a liquid crystal display module, as shown in fig. 12, which is provided with at least a glass protective layer 13, a touch panel 12, a liquid crystal panel 9, a reflective sheet 8, a back plate 7, and a photoelectric conversion sensor 3 in this order from top to bottom. The reflector plate and the back plate are provided with a plurality of imaging holes 2, and a photoelectric conversion sensor is arranged corresponding to each imaging hole. As shown, each imaging aperture and photoelectric conversion sensor form a collector.
When the device is executed, the control device in the device controls the photoelectric conversion sensor to collect the fingerprints and images corresponding to each imaging hole one by one and to splice the fingerprints and images to form complete fingerprints and images.
Example 13:
a liquid crystal terminal device according to the present embodiment includes a liquid crystal display module, as shown in fig. 13, which is provided with at least a glass protective layer 13, a touch panel 12, a liquid crystal panel 9, a reflective sheet 8, a back plate 7, and a photoelectric conversion sensor 3 in this order from top to bottom. A plurality of imaging holes 2 are formed in the reflector plate and the back plate, and a photoelectric conversion sensor is arranged below the back plate and corresponds to the imaging holes.
When the fingerprint acquisition device is executed, the control module in the device controls the opening and closing of the liquid crystal area A on the liquid crystal panel 9 so as to realize the opening and closing of each imaging hole and influence the fingerprint acquisition work of each imaging hole. For example, as shown in the figure, at time t1, the liquid crystal region a1 is opened to realize the acquisition operation of the first imaging hole; and closing other liquid crystal areas to suspend the acquisition work of other imaging holes. The photoelectric conversion sensor obtains a fingerprint and an image Y1; when the time t2 is, the liquid crystal area A2 is opened to realize the acquisition work of the second imaging hole; and closing other liquid crystal areas to suspend the acquisition work of other imaging holes. The photoelectric conversion sensor obtains a fingerprint and an image Y2; and the like, finally obtaining the fingerprint, images Y1, Y2, Y3 … and Y9. Then all the fingerprints and images are cut to obtain different areas corresponding to the real fingerprints and images, and the fingerprints and the images are spliced into complete fingerprints and images.
The control of the opening and closing of the liquid crystal area can be realized by displaying different contents to the liquid crystal area so as to enable the area to be transparent or opaque. For example, the area appears white, i.e., in a clear or open state; the display is black, i.e. opaque or closed.
Fig. 15 and 16 illustratively depict the meaning of "stitching into a complete fingerprint, image". Taking four apertures for example to capture four fingerprints, images, fig. 15 shows four fingerprints, images A, B, C, D captured through each of the four apertures. The four fingerprints and images only comprise partial effective areas of the whole fingerprints and images. The four images are cut, and the cut effective areas are spliced with each other to obtain a complete fingerprint and image as shown in fig. 16.
Example 14
A liquid crystal terminal device according to the present embodiment includes a liquid crystal display module, as shown in fig. 14, which is provided with at least a glass protective layer 13, a touch panel 12, a liquid crystal panel 9, a reflective sheet 8, a back plate 7, and a photoelectric conversion sensor 3 in this order from top to bottom. A plurality of imaging holes 2 are formed in the reflector plate and the back plate, and a photoelectric conversion sensor is arranged below the back plate and corresponds to each imaging hole.
When the device is executed, the control module in the device controls the opening and closing of the photoelectric conversion sensor so as to realize the fingerprint collection work corresponding to each imaging hole. For example, as shown in the figure, at time t1, the first photoelectric conversion sensor is turned on to realize the acquisition of the first imaging hole; and other photoelectric conversion sensors are closed to suspend the acquisition work of other imaging holes. The photoelectric conversion sensor obtains a fingerprint and an image Y1; when t2 moment, the second photoelectric conversion sensor is turned on to realize the acquisition work of the second imaging hole; and other photoelectric conversion sensors are closed to suspend the acquisition work of other imaging holes. The photoelectric conversion sensor obtains a fingerprint and an image Y2; and the like, finally obtaining the fingerprint, images Y1, Y2, Y3 … and Y9. Then all the fingerprints and images are cut to obtain different areas corresponding to the real fingerprints and images, and the fingerprints and the images are spliced into complete fingerprints and images.
Under the general condition, the quality of pinhole imaging can be improved by adopting the pinhole imaging principle to collect fingerprints and adopting the following measures, so that better fingerprint identification is achieved:
1. the surface of the glass protective layer of the liquid crystal panel can be coated or specially treated (such as semi-reflecting and semi-permeable coating, atomization treatment and the like), and the purpose of the treatment is to enhance the contrast of fingerprint lines and the background so as to enable the image of the fingerprint lines to be clearer.
2. Pinhole imaging has the disadvantage of uneven illumination, appearing brighter in the middle and darker at the periphery. An optical filter can be additionally arranged between the imaging hole and the photoelectric conversion sensing area and used for adjusting the uniformity of illumination.
3. When the size of the imaging aperture is large, the image will become blurred; when the imaging aperture size is small, the image is too dark. Therefore, a group of small lenses can be additionally arranged at the imaging hole to adjust light, so that clear imaging can be still obtained when the size of the small hole is larger.
The fingerprint recognition method for a liquid crystal panel according to the present invention will be further described with reference to the following embodiments.
Example 15:
the fingerprint identification method for the liquid crystal panel of the embodiment comprises the following steps:
responding a control signal to enable the liquid crystal panel to be in a light transmission state;
the fingerprint of the other side of the liquid crystal panel is collected by a camera device or a collector at one side of the liquid crystal panel.
Wherein, the collector is the above-mentioned collector.
The control signal may be a control signal obtained by touching the display screen, a control signal obtained by touching the key, a control signal obtained by responding to a remote signal, or the like, which is not listed here.
Taking the liquid crystal terminal device manufactured based on the collector as an example, firstly, the liquid crystal panel is electrified to ensure that the liquid crystal panel is completely or partially transparent, then the finger fingerprint surface of a person is attached to the transparent part of the liquid crystal panel, and the image pickup device or the collector collects fingerprint optical signals.
Example 16:
in the embodiment, a plurality of scanning areas aiming at the same fingerprint are established, so that the adjacent scanning areas are mutually overlapped; taking images of fingerprints corresponding to each scanning area one by one; and splicing the fingerprints and images obtained by scanning. The implementation process is as shown in fig. 12, and the control module in the device controls the opening and closing of the liquid crystal area a on the liquid crystal panel 9 to realize the opening and closing of each imaging hole, which affects the fingerprint collection work of each imaging hole. For example, as shown in the figure, at time t1, the liquid crystal region a1 is opened to realize the acquisition operation of the first imaging hole; and closing other liquid crystal areas to suspend the acquisition work of other imaging holes. The photoelectric conversion sensor obtains a fingerprint and an image Y1; when the time t2 is, the liquid crystal area A2 is opened to realize the acquisition work of the second imaging hole; and closing other liquid crystal areas to suspend the acquisition work of other imaging holes. The photoelectric conversion sensor obtains a fingerprint and an image Y2; and the like, finally obtaining the fingerprint, images Y1, Y2, Y3 … and Y9. Then all the fingerprints and images are cut to obtain different areas corresponding to the real fingerprints and images, and the fingerprints and the images are spliced into complete fingerprints and images.
Fig. 15 and 16 illustratively depict the meaning of "stitching into a complete fingerprint, image". Taking four apertures for example to capture four fingerprints, images, fig. 15 shows four fingerprints, images A, B, C, D captured through each of the four apertures. The four fingerprints and images only comprise partial effective areas of the whole fingerprints and images. The four images are cut, and the cut effective areas are spliced with each other to obtain a complete fingerprint and image as shown in fig. 16.
Example 17:
in the embodiment, a plurality of scanning areas aiming at the same fingerprint are established, so that the adjacent scanning areas are mutually overlapped; taking images of fingerprints corresponding to each scanning area one by one; and splicing the fingerprints and images obtained by scanning. When the device is executed, the control device in the device controls the closing and the opening of each photoelectric conversion sensor, collects the fingerprints and the images corresponding to each imaging hole one by one, and splices the fingerprints and the images to form complete fingerprints and images.
Description of the drawings: embodiments 6 to 17 above all describe a liquid crystal terminal capable of collecting a fingerprint, and the liquid crystal terminals of embodiments 6 to 17 may also be applied to image collection of a common target, where the image of the target includes a fingerprint image and images of other three-dimensional or planar targets, and the image collection and implementation principle of the common target are the same as that of fingerprint collection, and are not described herein again.
In addition, it should be noted that: the fingerprint collection method of the invention can be applied to the liquid crystal terminal equipment, but the liquid crystal terminal equipment is not limited to collect the fingerprint by the fingerprint collection method of the invention.
Example 18
As shown in fig. 17, in the image capturing device of the general object of the present embodiment, at least one panel 1 of the imaging holes 2 is provided with photoelectric conversion sensors 3 at intervals corresponding to the positions of the imaging holes. As shown in the figure, by using the principle of pinhole imaging, the target object can be imaged on the photoelectric conversion sensor through the imaging hole, thereby completing the acquisition of the common target object image corresponding to the imaging hole. The photoelectric conversion sensor can adopt a photosensitive element such as a CMOS or CCD and the like for collecting fingerprints. Fig. 1 shows the basic principle on which the invention is based.
Example 19:
this example is based on example 18: a transparent panel is added.
As shown in fig. 18, for some specific devices, the inside of the image capturing device may be protected by a transparent panel 4.
In both embodiments, a target image is captured through an imaging hole, the target image is captured through the imaging hole by a photosensitive element such as a CMOS or CCD, and light must be irradiated on the target object. On the basis of the above embodiments 18 and 19, an embodiment may be expanded, in which a light source emitter is disposed above or below the transparent panel, the light source emitter emits light to an object, the object emits scattered light in different directions after being irradiated, a part of the scattered light passes through the transparent panel and is projected onto the photosensitive device for imaging, and the light output by the light source emitter does not affect the optical path of the imaging hole.
Example 20:
this example is based on example 19: the imaging plate is further improved to be provided with a plurality of imaging holes, so that the purpose of expanding the visual field or realizing multi-view stereo vision can be achieved. The spacing between adjacent imaging apertures in this embodiment satisfies the following equation:
wherein D is the diameter of the small hole, LiIs the distance, L, from the center of the aperture plate to the upper surface of the photosensitive devicehIs the thickness of the small pore plate. The arrangement can enable each imaging hole to be imaged independently and not to interfere with each other.
The image acquisition device in each embodiment further comprises a wired or/and wireless communicator, a power supply and a controller. The light source module provides required illumination, can be placed on or under the protective panel and is required to not influence the light path of the pinhole imaging; the wired/wireless communicator provides a communication function with the outside, and transmits data and control commands; the power supply provided by the power supply can be externally connected with the power supply or a battery is used; the controller is responsible for controlling the working state of the ultrathin image sensor.
The ultrathin image acquisition device has simple structure, so the cost is low, and the ultrathin image acquisition device can be laid in large quantity. A plurality of sensors can be connected through a wired/wireless communicator to form a visual monitoring network for large-scale image acquisition and monitoring. Such as forest deforestation, fire protection, etc., have this need.
In summary, the thickness of the image acquisition device can be very thin, and the image acquisition device has the outstanding advantages of small volume and low cost compared with the traditional image sensor.
The method can be widely applied to various fields of visual monitoring in industrial production lines, monitoring detection in complex equipment, three-dimensional measurement and the like. The sensors can also form a wired or wireless network through a network module, and can be arranged in places which are difficult to monitor by manpower, such as forest protection, the interior of a mine, the interior of an underground pipeline, the interior of large-scale remote equipment (such as a lunar vehicle and a spacecraft) and the like, so as to monitor sudden conditions, disaster occurrence and the like in real time.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (16)
1. An image acquisition apparatus characterized by: the device at least comprises a protection panel and an imaging plate arranged below the protection panel at intervals, wherein the imaging plate is provided with an imaging hole for small hole imaging, photoelectric conversion sensors are arranged behind the imaging plate at intervals corresponding to the imaging hole, and the photoelectric conversion sensors are matched with the imaging hole to form a collector;
and when the image on the other side of the protection panel is in a light irradiation state, the collector collects the image on the other side of the protection panel through the protection panel.
2. An image acquisition apparatus characterized by: the device at least comprises a protection panel and an imaging plate arranged below the protection panel at intervals, wherein the imaging plate is provided with at least two imaging holes for small-hole imaging, each imaging hole corresponds to different areas of the same image, and fingerprint areas corresponding to any two adjacent imaging holes are mutually overlapped; one or more photoelectric conversion sensors are arranged behind the imaging plate at intervals corresponding to the plurality of imaging holes, and the photoelectric conversion sensors are matched with the plurality of imaging holes to form a collector;
and when the image on the other side of the protection panel is in a light irradiation state, the collector collects the image on the other side of the protection panel through the protection panel.
3. The image capturing device according to claim 2, wherein: the spacing between adjacent imaging apertures satisfies the following equation:
wherein D is the diameter of the small hole, LiIs the distance, L, from the center of the aperture plate to the upper surface of the photosensitive devicehIs the thickness of the small pore plate.
4. The image capturing device according to claim 2, wherein: the collector also comprises a control device, and the control device controls the photoelectric conversion sensor to collect images corresponding to each imaging hole one by one.
5. The image capturing device according to claim 1 or 2, characterized in that: also included is a light source emitter, wherein the light source emitter is disposed above or below the protective panel.
6. The image capturing device according to claim 1 or 2, characterized in that: also comprises a wired or/and wireless communicator.
7. The image capturing device according to claim 1 or 2, characterized in that: also includes a power supply and a controller.
8. A liquid crystal terminal device comprising a liquid crystal display module,
the liquid crystal display assembly at least comprises a liquid crystal panel and a backlight module;
the backlight module at least comprises a reflector plate and/or a back plate and one or more layers of optical diaphragms arranged between the reflector plate and/or the back plate and the liquid crystal plate;
a through hole for pinhole imaging is arranged on the reflector plate and/or the back plate, and a camera assembly or a collector is arranged behind the through hole;
each layer of optical film is at least provided with a light-transmitting part at the position corresponding to the through hole;
the camera shooting assembly or the collector can penetrate through the through hole, the light transmission part on the optical diaphragm and the liquid crystal panel to collect fingerprints or images on the other side of the liquid crystal panel in the light transmission state of the liquid crystal panel.
9. A liquid crystal terminal device comprising a liquid crystal display module,
the liquid crystal display assembly at least comprises a liquid crystal panel and a backlight module;
the backlight module at least comprises a reflector plate and/or a back plate and one or more layers of optical diaphragms arranged between the reflector plate and/or the back plate and the liquid crystal plate;
an imaging hole for pinhole imaging is formed in the reflector plate and/or the back plate, photoelectric conversion sensors are arranged behind the backlight module at intervals corresponding to the imaging hole, and the photoelectric conversion sensors are matched with the imaging hole to form a collector;
a light-transmitting part is arranged on each layer of optical film at least at the position corresponding to the imaging hole;
the collector can collect the fingerprint or image on the other side of the liquid crystal panel through the light-transmitting part on the optical diaphragm and the liquid crystal panel in the light-transmitting state of the liquid crystal panel.
10. A liquid crystal terminal device comprising a liquid crystal display module,
the liquid crystal display assembly at least comprises a liquid crystal panel and a backlight module;
the backlight module at least comprises a reflector plate and/or a back plate and one or more layers of optical diaphragms arranged between the reflector plate and/or the back plate and the liquid crystal plate;
a plurality of imaging holes for pinhole imaging are formed in the reflector plate and/or the back plate, a photoelectric conversion sensor is arranged behind the backlight module and corresponds to each imaging hole, each photoelectric conversion sensor and the corresponding imaging hole are arranged at intervals, and the photoelectric conversion sensors and the corresponding imaging holes are matched to form a collector;
a light-transmitting part is arranged on each layer of optical film at least at the position corresponding to the imaging hole;
the collector can collect the fingerprint or image on the other side of the liquid crystal panel through the light-transmitting part on the optical diaphragm and the liquid crystal panel in the light-transmitting state of the liquid crystal panel.
11. A liquid crystal terminal device comprising a liquid crystal display module,
the liquid crystal display assembly at least comprises a liquid crystal panel and a backlight module;
the backlight module at least comprises a reflector plate and/or a back plate and one or more layers of optical diaphragms arranged between the reflector plate and/or the back plate and the liquid crystal plate;
a plurality of imaging holes for pinhole imaging are arranged on the reflector plate and/or the back plate, each imaging hole corresponds to different areas of the same fingerprint, and the fingerprint areas corresponding to any two adjacent imaging holes are mutually overlapped; one or more photoelectric conversion sensors are arranged behind the backlight module at intervals corresponding to the plurality of imaging holes, and the photoelectric conversion sensors are matched with the plurality of imaging holes to form a collector;
a light-transmitting part is arranged on each layer of optical film at least at the position corresponding to the imaging hole;
the collector can collect the fingerprint or image on the other side of the liquid crystal panel through the light-transmitting part on the optical diaphragm and the liquid crystal panel in the light-transmitting state of the liquid crystal panel.
12. The liquid crystal terminal device of claim 11, further comprising a control device, wherein the control device controls the photoelectric conversion sensor to collect the fingerprint or image corresponding to each imaging hole one by one.
13. The liquid crystal terminal device according to claim 11, further comprising a control means for controlling the liquid crystal panel to open the liquid crystal panel of the fingerprint, image corresponding to each imaging hole one by one.
14. A liquid crystal terminal device according to any of claims 9 to 13, characterized in that the aperture of the imaging aperture is 0.001-1 mm.
15. The liquid crystal display terminal device according to any one of claims 9 to 13, wherein a filter is additionally provided between the imaging aperture and the photoelectric conversion sensor region or between the imaging aperture and the liquid crystal panel.
16. The liquid crystal terminal device according to any of claims 9 to 13, wherein a correction lens is added to either one side or both sides of the imaging aperture.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410281377.9A CN104063704B (en) | 2014-04-04 | 2014-06-20 | Image acquisition device, liquid crystal terminal equipment, fingerprint and image acquisition method |
| EP14888165.9A EP3147824A4 (en) | 2014-04-04 | 2014-12-19 | Image collection apparatus, terminal device, liquid crystal terminal device and image collection method |
| PCT/CN2014/094342 WO2015149545A1 (en) | 2014-04-04 | 2014-12-19 | Image collection apparatus, terminal device, liquid crystal terminal device and image collection method |
| US15/328,874 US10360430B2 (en) | 2014-04-04 | 2014-12-19 | Image acquisition apparatus, terminal device, liquid crystal terminal device and image acquisition method |
| TW104107727A TWI536274B (en) | 2014-04-04 | 2015-03-11 | Image acquisition device, terminal equipment, liquid crystal terminal equipment and image acquisition method |
| US16/384,773 US20190236329A1 (en) | 2014-04-04 | 2019-04-15 | Image Acquisition Apparatus, Terminal Device, Liquid Crystal Terminal Device and Image Acquisition Method |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410136810.XA CN103942537A (en) | 2014-04-04 | 2014-04-04 | Liquid crystal terminal device, fingerprint image collection method and fingerprint collector |
| CN201410136810.X | 2014-04-04 | ||
| CN201410136810X | 2014-04-04 | ||
| CN201410281377.9A CN104063704B (en) | 2014-04-04 | 2014-06-20 | Image acquisition device, liquid crystal terminal equipment, fingerprint and image acquisition method |
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| CN104063704A CN104063704A (en) | 2014-09-24 |
| CN104063704B true CN104063704B (en) | 2020-11-10 |
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| CN201410136810.XA Pending CN103942537A (en) | 2014-04-04 | 2014-04-04 | Liquid crystal terminal device, fingerprint image collection method and fingerprint collector |
| CN201410281377.9A Active CN104063704B (en) | 2014-04-04 | 2014-06-20 | Image acquisition device, liquid crystal terminal equipment, fingerprint and image acquisition method |
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| CN201410136810.XA Pending CN103942537A (en) | 2014-04-04 | 2014-04-04 | Liquid crystal terminal device, fingerprint image collection method and fingerprint collector |
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| CN103942537A (en) | 2014-07-23 |
| CN104063704A (en) | 2014-09-24 |
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