CN109635537B - Electronic device and fingerprint sensing method - Google Patents
Electronic device and fingerprint sensing method Download PDFInfo
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- CN109635537B CN109635537B CN201810933891.4A CN201810933891A CN109635537B CN 109635537 B CN109635537 B CN 109635537B CN 201810933891 A CN201810933891 A CN 201810933891A CN 109635537 B CN109635537 B CN 109635537B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
- G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
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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
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Abstract
The invention provides an electronic device and a fingerprint sensing method. The electronic device comprises a display panel, a fingerprint sensor and an integrated driving chip. The display panel includes a plurality of pixel units arranged in an array. The integrated driving chip integrates a display driving circuit and a fingerprint sensing circuit. When the pixel units of the display panel are in an undriven state and a finger object contacts the sensing area of the display panel to perform fingerprint unlocking operation, the display driving circuit drives at least one part of the pixel units corresponding to the sensing area so that the at least one part of the pixel units provides illumination light to the sensing area. The fingerprint sensing circuit drives the fingerprint sensor to acquire a fingerprint characteristic image of the finger object. The electronic device and the fingerprint sensing method of the invention can have the effects of reducing power consumption and fast sensing.
Description
Technical Field
The present invention relates to a fingerprint sensing technology, and more particularly, to an electronic device and a fingerprint sensing method using an in-screen fingerprint sensing technology.
Background
For an Active-Matrix Organic Light-Emitting Diode (AMOLED) display of an electronic device having an optical underscreen fingerprint sensor, a typical fingerprint unlocking mechanism is to output a driving command to an operating system of the electronic device to first turn on the AMOLED display and provide illumination Light to a finger object pressed on the AMOLED display. Then, the operating system of the electronic device outputs another driving command to drive the fingerprint sensor to acquire the fingerprint feature image. Finally, the operating system of the electronic device analyzes the fingerprint feature image to determine whether to perform an unlocking operation. However, the response speed of the typical fingerprint unlocking mechanism is too slow, and the AMOLED display is usually lit up from the beginning and continues to the completion of the unlocking operation, thereby wasting the power of the electronic device. In view of this, several exemplary embodiments of solutions will be presented below.
Disclosure of Invention
The invention provides an electronic device and a fingerprint sensing method, which can quickly drive a display panel and a fingerprint sensor through an integrated driving chip and can drive only part of pixel units corresponding to a sensing area of the display panel to provide a light source required by fingerprint sensing. Therefore, the electronic device and the fingerprint sensing method of the invention can have the effects of reducing power consumption and fast sensing.
The invention provides an electronic device which comprises a display panel, a fingerprint sensor and an integrated driving chip. The display panel includes a plurality of pixel units arranged in an array. The fingerprint sensor is disposed under the sensing area of the display panel. The integrated driving chip is coupled to the display panel and the fingerprint sensor and integrates the display driving circuit and the fingerprint sensing circuit. The display driving circuit is used for driving the display panel, and the fingerprint sensing circuit is used for driving the fingerprint sensor. When the pixel units of the display panel are in an undriven state and a finger object contacts the sensing area of the display panel to perform fingerprint unlocking operation, the display driving circuit drives at least one part of the pixel units corresponding to the sensing area so that the at least one part of the pixel units provides illumination light to the sensing area. The fingerprint sensing circuit drives the fingerprint sensor to acquire a fingerprint characteristic image of the finger object.
The fingerprint sensing method is suitable for the electronic device. The electronic device comprises a display panel, a fingerprint sensor and an integrated driving chip. The display panel includes a plurality of pixel units arranged in an array. The fingerprint sensing method comprises the following steps: when the pixel units of the display panel are in an undriven state and a finger object contacts the sensing area of the display panel to perform fingerprint unlocking operation, driving at least one part of the pixel units corresponding to the sensing area through a display driving circuit integrated in the integrated driving chip so as to enable at least one part of the pixel units to provide illumination light to the sensing area; and driving the fingerprint sensor through a fingerprint sensing circuit integrated in the integrated driving chip to acquire a fingerprint feature image of the finger object.
Based on the above, the electronic device and the fingerprint sensing method of the invention can drive the display panel and the fingerprint sensor by integrating the display driving circuit and the integrated driving chip of the fingerprint sensing circuit, and when the fingerprint sensing is performed, a part of the pixel units corresponding to the sensing area of the display panel can be immediately driven, and other pixel units outside the sensing area are not driven, so as to achieve the effects of reducing power consumption and rapidly sensing.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a block diagram of an electronic device according to an embodiment of the invention.
Fig. 2 is a schematic diagram of an electronic device according to an embodiment of the invention.
Fig. 3 is a schematic view of an electronic device in a sensing region according to an embodiment of the invention.
Fig. 4A to 4C are schematic diagrams illustrating examples of a plurality of light source patterns according to an embodiment of the invention.
Fig. 5 is a flow diagram of a fingerprint sensing method according to an embodiment of the present invention.
Fig. 6 is a flow diagram of a fingerprint sensing method according to another embodiment of the present invention.
Description of reference numerals:
100: an electronic device;
101: a sensing region;
102: a non-sensing region;
110: a display panel;
111: a glass panel;
111_1, 111_2, 111_ 3: a light source pattern;
112: a covering panel;
113_1, 113_ N, 113_ M: a pixel unit;
114: a substrate;
120: an integrated driving chip;
121: a display driving circuit;
122: a fingerprint sensing circuit;
130: a fingerprint sensor;
b11, B12, B13: a bright area pattern;
b21, B22, B23: a pattern of dark areas;
f: a finger article;
p1, P2, P3: direction;
i1, I2: an illumination light;
i1': image light;
r: a red pixel;
g: a green pixel;
b: a blue pixel;
s1, S2: the intensity of the optical signal;
s510, S520, S610, S620, S630: and (5) carrying out the following steps.
Detailed Description
In order that the present disclosure may be more readily understood, the following specific examples are given as illustrative of the invention which may be practiced in various ways. Further, wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Fig. 1 is a block diagram of an electronic device according to an embodiment of the invention. Referring to fig. 1, the electronic device 100 includes a display panel 110, an integrated driving chip 120, and a fingerprint sensor 130. The integrated driving chip 120 is coupled to the display panel 110 and the fingerprint sensor 130. In the present embodiment, the integrated driving Chip 120 is a System on Chip (SoC), and the integrated driving Chip 120 integrates the display driving circuit 121 and the fingerprint sensing circuit 122. The display driving circuit 121 is used for driving the display panel 110. The fingerprint sensing circuit 122 is used to drive the fingerprint sensor 130.
In the embodiment, the electronic device 100 may be a portable electronic product using an Under-screen optical fingerprint identification (underscreen optical fingerprint) technology, such as a smart phone (Mobile phone), a Tablet (Tablet), or a notebook (Laptop), but the invention is not limited thereto. In the embodiment, the display panel 110 may be an Active-Matrix Organic Light-Emitting Diode (AMOLED) and has a plurality of pixel units arranged in an array. In the present embodiment, the fingerprint sensor 130 may be an optical underscreen fingerprint sensor and includes a Complementary Metal-Oxide-Semiconductor (CMOS) sensor. In the present embodiment, the circuit of the fingerprint sensor 130 disposed under the sensing region of the display panel 110 and the display driving circuit 121 can be integrated into a system-on-a-chip. Therefore, when the electronic device 100 performs the fingerprint unlocking operation, the display driving circuit 121 may individually light at least a portion of the pixel units in the sensing region corresponding to the fingerprint sensing circuit 122 on the display panel 110.
It should be noted that the fingerprint unlocking operation means that when the electronic device 100 is operated in, for example, a screen lock state, a hibernation state, a sleep state, a protection state, or the like, if the user wishes to recover or operate the application function of the electronic device 100, the user must first perform identity authentication or screen unlocking. Therefore, the electronic device 100 needs to perform identity authentication or screen unlocking through fingerprint recognition.
Fig. 2 is a schematic diagram of an electronic device according to an embodiment of the invention. Referring to fig. 1 and fig. 2, the electronic device 100 may be a smart phone as shown in fig. 2. The display surface of the electronic device 100 faces the third direction P3. The first direction P1, the second direction P2 and the third direction P3 are perpendicular to each other. In the present embodiment, when the electronic apparatus 100 is operated in the screen-locked, standby or dormant state, if the user wants to use the electronic apparatus 100, the user must unlock the electronic apparatus first to enter the os screen of the electronic apparatus 100. At this time, the display panel 110 is not lit, and the pixel units of the display panel 110 are in an undriven state. However, when a finger object (a finger of a user) contacts (or presses) the sensing region 101 of the display panel 110 to perform a fingerprint unlocking operation, the display driving circuit 121 drives at least a portion of the pixel units corresponding to the sensing region 101, so that the at least a portion of the pixel units provides illumination light to the sensing region 101. Then, the fingerprint sensing circuit 122 drives the fingerprint sensor to acquire a fingerprint feature image of the finger object. In this embodiment, the processor of the electronic device 100 performs fingerprint identification according to the fingerprint feature image to determine whether to unlock the screen or enter the operating system screen of the electronic device 100.
That is, when the electronic device 100 performs the fingerprint unlocking operation, the display driving circuit 121 may individually light at least a portion of the pixel units in the sensing region 101 corresponding to the fingerprint sensing circuit 122 on the display panel 110. Also, the non-sensing region 102 of the display panel 110 corresponds to another portion of the pixel units, and the another portion of the pixel units corresponding to the non-sensing region 102 maintains an undriven state when the electronic device 100 performs a fingerprint unlocking operation. In the present embodiment, the sensing region 101 of the display panel 110 is smaller than the non-sensing region 102. The display region of the display panel 110 includes a sensing region 101 and a non-sensing region 102. In other words, the sensing region 101 of the display panel 110 is smaller than the display region.
It is noted that, in the present embodiment, the display panel 110 may be an active matrix organic light emitting display, and therefore, the pixel units of the display panel 110 may include a plurality of color pixel types (e.g., red, blue, green). Therefore, when a finger object touches the sensing region 101 of the display panel 110 to perform a fingerprint unlocking operation, at least a portion of the pixel units driven by the display driving circuit 121 may be at least one of the color pixel types. In other words, when the electronic device 100 performs the fingerprint unlocking operation, the display driving circuit 121 may individually light at least a portion of the specific color pixel types on the display panel 110 corresponding to the pixel units in the sensing region 101 of the fingerprint sensing circuit 122, for example, individually light the red pixel units to provide only the red illumination light. The display driving circuit 121 may determine to light the pixel units of a specific color pixel type in the sensing region 101 on the display panel 110 according to different fingerprint sensing requirements or device requirements, so as to provide the effects of power saving, convenience and flexible operation of the pixel units.
Fig. 3 is a schematic view of an electronic device in a sensing region according to an embodiment of the invention. Referring to fig. 1 to 3, fig. 3 is a structure of optical fingerprint sensing under a screen. The electronic device 100 includes a display panel 110 and a fingerprint sensor 130. In the present embodiment, the electronic device 100 provides a display screen in the first direction P1. The fingerprint sensor 130 is disposed under the sensing region 101 of the display panel 110, and the display panel 110 has a gap with the fingerprint sensor 130. In the present embodiment, the display panel 110 includes a glass panel 111, a cover panel 112, a plurality of pixel units 113-113 _ M, and a substrate 114. M is a positive integer greater than 1. The glass panel 111, the cover panel 112, the plurality of pixel units 113-113 _ M, and the substrate 114 are sequentially stacked from top to bottom.
Take a certain pixel unit 113_ N as an example, where N is a positive integer greater than 1 and less than or equal to M. When the electronic device 100 performs the fingerprint unlocking operation, the pixel unit 113_ N is lit to provide the illumination light I1 toward the glass panel 111 and the cover panel 112, and simultaneously provide the illumination light I2 toward the fingerprint sensor 130. When the finger object F touches the glass panel 111, the illumination light I1 will be reflected by the contact surface of the finger object F and the glass panel 111, so that the image light I1' with the fingerprint feature information of the finger object F is incident on the fingerprint sensor 130 in the opposite direction to the third direction P3. However, since the light signal intensity S2 of the illumination light I2 has a stronger light signal intensity S1 than the image light I1' at a position directly below the pixel cell 113_ N, the signal-to-noise ratio of the fingerprint image taken by the fingerprint sensor 130 at a position directly below the pixel cell 113_ N is high. In other words, since the illumination light I2 has no fingerprint feature information, when both the image light I1 'and the illumination light I2 enter the fingerprint sensor 130, the illumination light I2 will become background light noise in the fingerprint feature image generated by the fingerprint sensor 130, and affect the fingerprint feature displayed by the image light I1'. In this regard, to increase the intelligibility and accuracy of the fingerprint image acquired by the fingerprint sensor 130. In the present embodiment, the electronic device 100 uses at least a portion of the pixel units 113-113 _ M driven in the sensing region 101 of the display panel 110 as a display light source pattern, and the light source pattern has a periodic variation pattern to reduce the influence of the illumination light I2.
It is noted that the light source patterns described in the above embodiments have multiple ordered patterns or multiple disordered patterns, and the following description will be further provided with examples of the light source patterns provided in fig. 4A to 4C.
Fig. 4A to 4C are schematic diagrams illustrating examples of a plurality of light source patterns according to an embodiment of the invention. Referring to fig. 1 to 3 and 4A, the pixel units 113_1 to 113_ M may be respectively composed of a red pixel R, a green pixel G and a blue pixel B, but the invention is not limited thereto. When the pixel units 113_ 1-113 _ M of the display panel 100 are in an undriven state and the finger object F contacts the sensing region 101 of the display panel 110 for performing the fingerprint unlocking operation, at least a portion of the driven pixel units 113_ 1-113 _ M of the display panel 110 in the sensing region 101 displays the light source pattern 111_1 shown in FIG. 4A. The light source pattern 111_1 may have a plurality of ordered patterns, and the ordered patterns are composed of a plurality of bright region patterns B11 (diagonal regions). In this example, the light source pattern 111_1 may include a plurality of bright region patterns B11 and a continuous dark region pattern B21 (non-oblique line regions), and the bright region patterns B11 are arranged in a regular manner and a periodic manner in the second direction P2. It should be noted that the bright region patterns B11 indicate that the green pixel G of at least one pixel unit of the corresponding regions of the display panel 110 is lit (alternatively, the red pixel R or the blue pixel B is lit), and the dark region patterns B21 indicate that the remaining pixels of the display panel 110 except the green pixel G in the bright region patterns B11 are not lit (in an undriven state) or provide lower brightness, but the invention is not limited thereto. In one embodiment, the bright region pattern B11 may also indicate that the red pixel R, the green pixel G, and the blue pixel B of at least one pixel unit of the corresponding regions of the display panel 110 are all lighted to emit white light. In this regard, the fingerprint sensor 130 may effectively avoid the situation that the illumination light from the pixel unit is directly emitted to result in an excessively high signal-to-noise ratio in the partial image of the fingerprint image acquired corresponding to the dark region pattern B21. In other words, the partial image of the fingerprint image acquired by the fingerprint sensor 130 may have a low signal-to-noise ratio without the signal-to-noise ratio of the entire fingerprint image being too high.
Referring to fig. 1 to fig. 3 and fig. 4B, like the example of fig. 4A, when the electronic device 100 performs the fingerprint unlocking operation, the sensing region 101 may display a light source pattern 111_2, wherein the light source pattern 111_2 may have a plurality of ordered patterns. The ordered patterns are a plurality of ordered patterns composed of a plurality of bright area patterns B12 (diagonal areas) and a plurality of dark area patterns B22 (non-diagonal areas). In this example, the light source pattern 111_2 may include a portion of a plurality of bright region patterns B12 and a continuous plurality of dark region patterns B22, and the bright region patterns B12 are presented in a specific pattern. As shown in fig. 4B, the bright area patterns B12 may be arranged in a rectangle and the center is a pattern of the dark area pattern B22. The patterns of the bright area pattern B12 may be arranged in an array in the first direction P1 and the second direction P2, or arranged in another regular manner or in a periodic manner, but the invention is not limited thereto. The location of the bright area patterns B12 may be determined according to the characteristics of the fingerprint sensor 130 or the image acquisition requirements. In other words, in one embodiment, the positions of the patterns formed by the bright area patterns B12 may also be randomly arranged. It should be noted that the bright region patterns B12 indicate that the green pixel G of at least one pixel unit of the corresponding regions of the display panel 110 is lit (alternatively, the red pixel R or the blue pixel B is lit), and the dark region patterns B22 indicate that the remaining pixels of the display panel 110 except the green pixel G in the bright region patterns B12 are not lit (in an undriven state) or provide lower brightness, but the invention is not limited thereto. In one embodiment, the bright region pattern B12 may also indicate that the red pixel R, the green pixel G, and the blue pixel B of at least one pixel unit of the corresponding regions of the display panel 110 are all lighted to emit white light. In this regard, the fingerprint sensor 130 may effectively avoid the situation that the illumination light from the pixel unit is directly emitted to result in an excessively high signal-to-noise ratio in the partial image of the fingerprint image acquired corresponding to the dark region pattern B22. In other words, the partial image of the fingerprint image acquired by the fingerprint sensor 130 may have a low signal-to-noise ratio without having a high signal-to-noise ratio of the entire fingerprint image.
Referring to fig. 1 to fig. 3 and fig. 4C, like the example of fig. 4A, when the electronic device 100 performs the fingerprint unlocking operation, the sensing region 101 may display a light source pattern 111_3, wherein the light source pattern 111_3 may have a plurality of disordered patterns. These disordered patterns include a plurality of bright area patterns B13 (diagonal areas). In this example, the light source pattern 111_3 may include the bright area patterns B13 and a continuous dark area pattern B23 (non-oblique line areas), and the bright area patterns B13 are arranged in an irregular manner. It should be noted that the bright region patterns B13 indicate that the green pixel G of at least one pixel unit of the corresponding regions of the display panel 110 is lit (alternatively, the red pixel R or the blue pixel B is lit), and the dark region patterns B23 indicate that the remaining pixels of the display panel 110 except the green pixel G in the bright region patterns B13 are not lit (in an undriven state) or provide lower brightness, but the invention is not limited thereto. In one embodiment, the bright region pattern B13 may also indicate that the red pixel R, the green pixel G, and the blue pixel B of at least one pixel unit of the corresponding regions of the display panel 110 are all lighted to emit white light. In this regard, the fingerprint sensor 130 may effectively avoid the situation that the illumination light from the pixel unit is directly emitted to result in an excessively high signal-to-noise ratio in the partial image of the fingerprint image acquired corresponding to the dark region pattern B23. In other words, the partial image of the fingerprint image acquired by the fingerprint sensor 130 may have a low signal-to-noise ratio without having a high signal-to-noise ratio of the entire fingerprint image.
According to the above-mentioned examples of fig. 4A to 4C, it should be noted that the bright area pattern of the present invention may be that one of the red pixel R, the green pixel G and the blue pixel B is turned on to emit light of a specific color, or that the red pixel R, the green pixel G and the blue pixel B are all turned on according to different requirements to emit white light. That is, the manner of forming the bright area pattern by lighting a part of the pixels of the pixel units 113_1 to 113_ M according to the present invention can actually determine to light the pixels of a specific color or light all the color pixels in the pixel units according to different fingerprint identification requirements.
However, in one embodiment, the fingerprint sensor 130 is not limited to acquiring one fingerprint feature image when the electronic device 100 performs the fingerprint unlocking operation. At least a portion of the pixel units 113_ 1-113 _ M driven by the display panel 110 in the sensing region 101 can continuously display a plurality of light source patterns with different periodic variation patterns. For example, the display panel 110 may alternately display the light source pattern 111_1 of fig. 4A and the light source pattern 111_2 of fig. 4B in the sensing region 101, and the fingerprint sensor 130 correspondingly acquires two fingerprint feature images of the finger object F. Due to the different positions of light source pattern 111_1 and dark region patterns B21 and B22 of light source pattern 111_2, the clearer portions of the two fingerprint feature images are different (the lower positions of the signal-to-noise ratio are different). Thus, the fingerprint sensing circuit 130 may recombine the two fingerprint feature images. The fingerprint sensing circuit 130 may generate a reconstructed fingerprint feature image by superimposing the respective sharper portions of the two fingerprint feature images (i.e., superimposing the portions of the images at the locations with lower signal-to-noise ratios). Compared with the two fingerprint characteristic images, the fingerprint characteristic image after recombination is clearer in overall image and has the characteristic of good identifiability.
Fig. 5 is a flow diagram of a fingerprint sensing method according to an embodiment of the present invention. Referring to fig. 1 to 3 and fig. 5, the fingerprint sensing method of the present embodiment can be applied to the electronic device 100 of the embodiment of fig. 1 to 3. The electronic device 100 includes a display panel 110, an integrated driving chip 120 and a fingerprint sensor 130, and the integrated driving chip 120 is integrated with a display driving circuit 121 and a fingerprint sensing circuit 122. In step S510, when the plurality of pixel units 113_1 to 113_ M of the display panel 110 are in an undriven state and the finger object F touches the sensing region 101 of the display panel 110 to perform a fingerprint unlocking operation, the display driving circuit 121 integrated in the integrated driving chip 120 drives at least a portion of the pixel units 113_1 to 113_ M corresponding to the sensing region 101, so that at least a portion of the pixel units 113_1 to 113_ M provides illumination light to the sensing region 101. In step S520, the fingerprint sensing circuit 122 integrated in the integrated driving chip 120 drives the fingerprint sensor 130 to obtain the fingerprint feature image of the finger object F. Therefore, in the present embodiment, when the electronic device 100 performs the fingerprint unlocking operation, the display driving circuit 121 can individually light at least a portion of the pixel units 113_1 to 113_ M in the sensing region 101 corresponding to the fingerprint sensing circuit 122 on the display panel 110, without lighting all the pixel units of the display panel 110. The fingerprint sensing method of the embodiment can provide the effects of saving electricity, being convenient and being capable of flexibly operating the pixel units.
In addition, other component features, device characteristics, or implementations of the electronic device 100 of the present embodiment can be obtained by referring to the description of the embodiment in fig. 1 to 4C to obtain sufficient teaching, suggestion, and implementation descriptions, and thus are not repeated.
Fig. 6 is a flow diagram of a fingerprint sensing method according to another embodiment of the present invention. Referring to fig. 1 to 3 and fig. 6, the fingerprint sensing method of the present embodiment may be applied to the electronic device 100 of the embodiment of fig. 1 to 3. In addition to the fingerprint sensing method of the electronic device 100 in the above embodiments, the electronic device 100 also has a function of automatically monitoring the display panel 110. Specifically, if the display panel 110 is an active matrix organic light emitting display, the display panel 110 may have a brightness decay with the increase of the usage time. However, in order to increase the lifetime of the active matrix organic light emitting display, the electronic device 100 of the present embodiment may monitor the light status image of the display panel 110 through the fingerprint sensor 130, and may adjust the driving voltage or the driving current for driving a part or the whole of the pixel units of the display panel 110 in real time when the brightness of the display panel 110 is attenuated. Therefore, the electronic device 100 may perform the following steps S610 to S630.
In step S610, the fingerprint sensing circuit 122 drives the fingerprint sensor 130 to acquire a light emitting state image of the sensing region 111 of the display panel 110. In step S620, the fingerprint sensing circuit 122 analyzes the light-emitting status image, so that the integrated driving chip 120 correspondingly adjusts the driving voltage or the driving current provided by the display driving circuit 121 to the display panel 110 according to the light-emitting status image. Therefore, the display panel 110 can adjust the driving voltage or the driving current for driving the display panel 110 in real time. In step S630, the integrated driving chip 120 may record the adjustment history of the driving voltage or the driving current, and transmit the adjustment history back to the external cloud server in a wired or wireless communication transmission manner. In other words, the electronic device 100 can also synchronously transmit the adjustment history of the driving voltage or the driving current back to the external cloud server provided by the manufacturer, so as to effectively feedback the usage performance of the display panel 110 to the manufacturer. Therefore, the manufacturer can perform big data analysis accordingly, and effectively grasp and improve the panel quality of the display panel 110.
In addition, steps S610 to S630 of the present embodiment may be executed after step S520 of the embodiment of fig. 5. In other words, the electronic device 100 can monitor whether the brightness of the display panel 110 is attenuated or not during the fingerprint unlocking operation, and perform the compensation adjustment of the driving voltage or the driving current of the display panel 110 in real time. In an embodiment, steps S610 to S630 of the present embodiment may also be independent operations, and are not limited to being performed after step S520 of the embodiment of fig. 5. In addition, other component features, device characteristics, or implementations of the electronic device 100 of the present embodiment can be obtained by referring to the description of the embodiment in fig. 1 to 4C to obtain sufficient teaching, suggestion, and implementation descriptions, and thus are not repeated.
In summary, the electronic device and the fingerprint sensing method of the present invention can integrate the display driving circuit and the integrated driving chip of the fingerprint sensing circuit to drive the display panel and the fingerprint sensor, and when performing fingerprint sensing, a portion of the pixel units corresponding to the sensing area of the display panel can be immediately driven, and other pixel units outside the sensing area are not driven. When fingerprint sensing is performed, the plurality of pixel units in the sensing region of the display panel can be partially lighted up to display a light source pattern having at least one bright area pattern or at least one dark area pattern that changes periodically or non-periodically, and accordingly, illumination light is provided to the finger object contacting the sensing region of the display panel. Therefore, the electronic device and the fingerprint sensing method have the effects of low power consumption and quick sensing, and can generate good fingerprint characteristic images, so that the accuracy of fingerprint identification can be effectively improved.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, and various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (18)
1. An electronic device, comprising:
a display panel including a plurality of pixel units arranged in an array;
a fingerprint sensor disposed under a sensing area of the display panel; and
an integrated driving chip coupled to the display panel and the fingerprint sensor and integrating a display driving circuit and a fingerprint sensing circuit, wherein the display driving circuit is used for driving the display panel and the fingerprint sensing circuit is used for driving the fingerprint sensor,
wherein when the plurality of pixel cells of the display panel are in an undriven state and a finger object contacts the sensing region of the display panel to perform a fingerprint unlocking operation, the display driving circuit drives at least a portion of the plurality of pixel cells corresponding to the sensing region to cause the at least a portion of the plurality of pixel cells to provide illumination light to the sensing region, the driven at least a portion of the plurality of pixel cells of the display panel in the sensing region are to continuously display a plurality of light source patterns having different periodic variation patterns, and the fingerprint sensing circuit drives the fingerprint sensor to acquire a plurality of fingerprint feature images of the finger object,
wherein the fingerprint sensing circuit recombines the plurality of fingerprint feature images to produce a recombined fingerprint feature image.
2. The electronic device of claim 1, wherein the sensing area of the display panel is smaller than a display area of the display panel.
3. The electronic device of claim 1, wherein a non-sensing area of the display panel corresponds to another portion of the plurality of pixel cells, and the another portion of the plurality of pixel cells corresponding to the non-sensing area maintains the undriven state when the finger object contacts the sensing area of the display panel for the fingerprint unlock operation.
4. The electronic device of claim 1, wherein the display panel is an active matrix organic light emitting display and the plurality of pixel cells comprise a plurality of color pixel types.
5. The electronic device of claim 4, wherein the at least a portion of the plurality of pixel cells driven by the display driving circuit is at least one of the plurality of color pixel types when the finger object contacts the sensing region of the display panel for the fingerprint unlock operation.
6. The electronic device of claim 1, wherein when the finger object contacts the sensing region of the display panel for the fingerprint unlocking operation, at least a portion of the plurality of pixel cells of the display panel that are driven in the sensing region are displaying light source patterns, and the light source patterns are periodically changing patterns or are non-periodically changing patterns,
the light source pattern includes a plurality of bright area patterns and a plurality of dark area patterns.
7. The electronic device of claim 6, wherein the light source pattern is the periodically varying pattern, and at least one of the plurality of bright area patterns and the plurality of dark area patterns is periodically arranged in at least one of a first direction and a second direction.
8. The electronic device of claim 1, wherein the fingerprint sensing circuit is further configured to drive the fingerprint sensor to obtain a light-emitting status image of the sensing area of the display panel, and the fingerprint sensing circuit analyzes the light-emitting status image, so that the integrated driving chip adjusts a driving voltage or a driving current provided by the display driving circuit to the display panel according to the light-emitting status image.
9. The electronic device of claim 8, wherein the integrated driver chip is further configured to record an adjustment history of the driving voltage or the driving current, and to transmit the adjustment history back to a cloud server.
10. A fingerprint sensing method is applied to an electronic device, wherein the electronic device comprises a display panel, a fingerprint sensor and an integrated driving chip, and the display panel comprises a plurality of pixel units arranged in an array, wherein the fingerprint sensing method comprises the following steps:
when the plurality of pixel units of the display panel are in an undriven state and a finger object contacts a sensing area of the display panel to perform fingerprint unlocking operation, driving at least one part of the plurality of pixel units corresponding to the sensing area through a display driving circuit integrated in the integrated driving chip so as to enable the at least one part of the plurality of pixel units to provide illumination light to the sensing area, wherein the driven at least one part of the plurality of pixel units of the display panel in the sensing area continuously displays a plurality of light source patterns with different periodic variation patterns;
driving the fingerprint sensor through a fingerprint sensing circuit integrated in the integrated driving chip to acquire a plurality of fingerprint feature images of the finger object; and
recombining, by the fingerprint sensing circuit, the plurality of fingerprint feature images to produce a recombined fingerprint feature image.
11. The fingerprint sensing method according to claim 10, wherein the sensing area of the display panel is smaller than a display area of the display panel.
12. The fingerprint sensing method according to claim 10, wherein a non-sensing area of the display panel corresponds to another portion of the plurality of pixel cells, and the another portion of the plurality of pixel cells corresponding to the non-sensing area maintains the undriven state when the finger object contacts the sensing area of the display panel for the fingerprint unlock operation.
13. The fingerprint sensing method according to claim 10, wherein said display panel is an active matrix organic light emitting display and said plurality of pixel cells comprises a plurality of color pixel types.
14. The fingerprint sensing method according to claim 13, wherein the at least a portion of the plurality of pixel cells driven by the display driver circuit is at least one of the plurality of color pixel types when the finger object contacts the sensing area of the display panel for the fingerprint unlock operation.
15. The fingerprint sensing method according to claim 10, wherein the step of driving at least a portion of the plurality of pixel cells corresponding to the sensing region by the display driving circuit integrated in the integrated driving chip comprises:
at least a portion of the plurality of pixel cells driven in the sensing region by the display panel is a display light source pattern, and the light source pattern is a periodic variation pattern or a non-periodic variation pattern,
the light source pattern includes a plurality of bright area patterns and a plurality of dark area patterns.
16. The fingerprint sensing method according to claim 15, wherein said light source pattern is said periodically varying pattern, and at least one of said plurality of bright area patterns and said plurality of dark area patterns is periodically arranged in at least one of a first direction and a second direction.
17. The fingerprint sensing method according to claim 10, further comprising:
the fingerprint sensing circuit is further used for driving the fingerprint sensor to acquire a light-emitting state image of the sensing area of the display panel; and
the light-emitting state image is analyzed through the fingerprint sensing circuit, so that the integrated driving chip adjusts the driving voltage or the driving current provided by the display driving circuit to the display panel according to the light-emitting state image.
18. The fingerprint sensing method according to claim 17, further comprising:
recording the adjustment history of the driving voltage or the driving current through the integrated driving chip, and transmitting the adjustment history back to a cloud server.
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| TW201915649A (en) | 2019-04-16 |
| CN109635537A (en) | 2019-04-16 |
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