TW201926135A - Image stitching full-screen fingerprint detection method and fingerprint detection system using the same featuring high efficiency, low power consumption and user friendly - Google Patents

Abstract

An image stitching full-screen fingerprint detection method includes the following steps: using a touch detection circuit to perform a touch scanning process to detect a finger pressing area on a glass cover plate; using a processor to find at least one fingerprint detection area covered by the finger pressing area; and using the processor to activate at least one optical fingerprint detection circuit to obtain at least one pattern image from the at least one fingerprint detection area, and stitching and combining the plurality of pattern images into a fingerprint image when the at least one fingerprint detection area comprises a plurality of fingerprint detection areas.

Description

Image stitching full-screen fingerprint detection method and fingerprint detection system using the same

The invention relates to a full-screen fingerprint detection method, in particular to a high-efficiency, low-power consumption, and user-friendly full-screen fingerprint detection method.

With the development of new mobile phone technology and the continuous increase of mobile phone users' needs, in order to achieve a better user experience, increasing the proportion of mobile phone screen area, and even the full screen has become a major trend in the development of smart terminals. However, in the traditional capacitive fingerprint recognition architecture, since the capacitance detection cannot penetrate the thicker glass, it still cannot complete the task of removing the physical home (return to original position) key.

In order to remove the physical Home button, it is known that there is a technical solution for placing an optical fingerprint recognition module under the screen to perform optical fingerprint recognition on a specific fingerprint input area on the screen. However, since the display screen must be sufficiently transparent to allow the optical fingerprint identification module to work normally, this technical solution will affect the display effect.

To solve the above problems, a new optical fingerprint detection architecture is urgently needed in the art.

An object of the present invention is to disclose a full-screen fingerprint detection method, which can detect a fingerprint by first detecting a finger pressing position by using a touch detection procedure, and then detecting an fingerprint by using an optical fingerprint detection circuit. At the same time, the power consumption of the entire device is greatly reduced.

Another object of the present invention is to disclose a full-screen fingerprint detection method. When a fingerprint is detected on a large-sized display screen, the fingerprint information can be obtained faster than the traditional full-screen fingerprint detection method, and the power consumption can be saved.

Another object of the present invention is to disclose a full-screen fingerprint detection method, which can perform an image stitching operation on two measured texture images when a finger is pressed between two sets of fingerprint detection areas to obtain a Complete fingerprint information.

In order to achieve the aforementioned purpose, a full-screen fingerprint detection method for image stitching is proposed, which includes the following steps:

Using a touch detection circuit to execute a touch scanning procedure to detect a finger pressing area on a glass cover;

Using a processor to find at least one fingerprint detection area covered by the finger pressing area; and

The processor is used to activate at least one optical fingerprint detection circuit to obtain at least one texture image from the at least one fingerprint detection area, and when the at least one fingerprint detection area includes multiple fingerprint detection areas, The texture image is stitched into a fingerprint image.

In one embodiment, the touch detection circuit is composed of a resistive touch detection circuit, a capacitive touch detection circuit, a pressure touch detection circuit and an acoustic wave touch detection. A touch detection circuit selected by a group of circuits.

In one embodiment, the optical fingerprint detection circuit includes a light source, a lens, and a photosensitive array, and when the optical fingerprint detection circuit is activated, the optical fingerprint detection circuit is configured to cause the output light of the light source to pass through the glass cover. The inside propagates in a total reflection manner and irradiates a finger pressing position on the glass cover, thereby generating an output light carrying information of the fingerprint, and the output light is focused by the lens and irradiates the photosensitive array. .

In one embodiment, the light source is a light source capable of changing the direction of the output optical axis.

To achieve the foregoing object, a fingerprint detection system is proposed, which provides a fingerprint detection function by using the aforementioned image stitching full-screen fingerprint detection method.

In order to enable your reviewers to further understand the structure, characteristics, and purpose of the present invention, drawings and detailed descriptions of the preferred embodiments are attached below.

In order to solve the problems of the prior art, the present invention proposes a fingerprint detection architecture, which makes multiple areas of the entire display screen can be used as a fingerprint identification area by totally reflecting the incident light in a glass cover. . Please refer to FIG. 1, which illustrates a side view of an optical fingerprint detection device according to the present invention. As shown in FIG. 1, the optical fingerprint detection device includes a glass cover 101, a light source 102, a lens 103 and a photosensitive array 104.

The glass cover 101 has a first surface 101a and a second surface 101b opposite to each other, and a first side 101c and a second side 101d opposite to each other, wherein the first surface 101a is used to provide at least one fingerprint identification. District 101r.

The light source 102 is located on the first side 101c of the glass cover 101.

The lens 103 has a light incident surface 103a and a light emitting surface 103b. The light incident surface 103a faces the second side 101d of the glass cover plate 101.

The photosensitive array 104 faces the light emitting surface 103b of the lens 103.

The principle of the optical fingerprint detection device of FIG. 1 is that when light emitted from the light source 102 is irradiated to a fingerprint recognition area 101r of the first surface 101a of the glass cover 101 through the first side 101c of the glass cover 101, the fingerprint identification The area 101r is in contact with multiple fingerprint valleys of a fingerprint of a finger 200 to reflect incident light, and then passes through the second side 101d of the glass cover 101 through multiple total reflections, and then through the focusing effect of the lens 103, Irradiated on the photosensitive array 104 and formed a plurality of bright stripes; and where the fingerprint recognition area 101r is in contact with multiple fingerprint ridges of the fingerprint, the incident surface will be diffused due to the roughened contact surface, making it difficult to reach the photosensitive array 104, Therefore, a plurality of dark stripes are correspondingly formed on the photosensitive array 104. According to this, the optical fingerprint detection device can convert the valley and ridge information of the fingerprint into the light and dark stripe information on the photosensitive array 104.

In addition, since the light emitted by the light source 102 can be totally reflected multiple times in the glass cover 101, by changing the incident angle of the light source 102 (that is, changing the angle of total reflection), the first surface 101a of the glass cover 101 is Multiple fingerprint detection areas are available. That is, the optical fingerprint detection device can change the direction of the optical axis of the light source 102 so that the output light of the light source 102 can be reflected in the glass cover 101 and transmitted to the photosensitive array 104. A plurality of areas above the screen perform a fingerprint recognition operation.

In addition, with the advancement and development of technology, the size required for the display screen of mobile phones is getting larger and larger. The present invention further proposes another optical fingerprint detection device, which is provided with multiple sets of "light source-lens-photosensitive array" in Each fingerprint detection area is connected to cover the entire display screen, achieving the effect of full-screen fingerprint detection. Please refer to FIG. 2, which illustrates a top view of another optical fingerprint detection device of the present invention. As shown in FIG. 2, the optical fingerprint detection device includes a glass cover 101, four light sources 102, four lenses 103, and four photosensitive arrays 104.

The glass cover plate 101 has a first surface 101a and a second surface (not shown) opposite to each other, and a first side 101c and a second side 101d opposite to each other. The first surface 101a is used for Provide multiple fingerprint identification areas.

The four light sources 102 are located on the first side 101c of the glass cover 101.

Each of the four lenses 103 corresponds to a light source 102 and has a light incident surface 103a and a light emitting surface 103b. The light incident surface 103a faces the second side 101d of the glass cover plate 101.

Each of the four photosensitive arrays 104 faces a light emitting surface 103b of a lens 103.

During operation, the optical fingerprint detection device may turn on each light source 102 sequentially or simultaneously, so that the output light of each light source 102 travels in the glass cover 101 in a total reflection manner and then is transmitted to a corresponding photosensitive array 104, and A fingerprint recognition operation can be performed in any area above a display screen, thereby providing a full-screen optical fingerprint recognition function.

However, with the increasing demand for the size of mobile phone display screens, in order to cover larger display screens, more and more "light sources-lenses-photosensitive arrays" are needed, resulting in the scanning time for fingerprint information detection and scanning. Longer, and the resulting power consumption has increased exponentially.

To solve the above problems, the present invention further proposes an intelligent full-screen fingerprint detection method. Please refer to FIG. 3, which is a flowchart of an embodiment of a full-screen fingerprint detection method for image stitching according to the present invention.

As shown in FIG. 3, the image stitching full-screen fingerprint detection method includes: using a touch detection circuit to execute a touch scanning procedure to detect a finger pressing area on a glass cover (step a); using a processing The processor finds at least one fingerprint detection area covered by the finger pressing area (step b); and uses the processor to activate at least one optical fingerprint detection circuit to obtain at least one texture image from the at least one fingerprint detection area, And stitching a plurality of the texture images into a fingerprint image when the at least one fingerprint detection area includes a plurality of fingerprint detection areas (step c).

Wherein, the optical fingerprint detection circuit includes a light source, a lens, and a photosensitive array, and when the optical fingerprint detection circuit is activated, the output light of the light source is transmitted through the glass cover in full. The reflection mode propagates and irradiates a finger pressing position on the glass cover, thereby generating an output light carrying information of the fingerprint, and after the output light is focused by the lens, the photosensitive array is illuminated, and In a possible embodiment, the light source is a light source capable of changing the direction of the output optical axis. In addition, the touch detection circuit may be a resistive touch detection circuit, a capacitive touch detection circuit, a pressure touch detection circuit or an sonic touch detection circuit. If the touch detection circuit does not detect any touch input operation, the full-screen fingerprint detection method will perform step a again; if the touch detection circuit detects at least one touch input operation, the full screen The fingerprint detection method then proceeds to step b.

Particularly, in step c, when the at least one fingerprint detection area includes only one fingerprint detection area, the obtained texture image is the fingerprint image; and when the at least one fingerprint detection area When the area includes multiple fingerprint detection areas, the present invention stitches a plurality of the texture images into a fingerprint image.

Please refer to FIG. 4, which illustrates a schematic diagram of an operation scenario of the image stitching full-screen fingerprint detection method of the present invention. As shown in FIG. 4, a fingerprint 200 a is a finger pressing area covered on the glass cover 101, and the finger pressing area is located between the optical fingerprint detection circuit numbered 2 and the optical fingerprint detection circuit numbered 3. Therefore, the optical fingerprint detection circuit with the number 2 and the optical fingerprint detection circuit with the number 3 will be activated by a processor, so that the output light of the light source 102 with the numbers 2 and 3 is totally reflected in the glass cover 101. Propagating and irradiating the finger pressing area on the glass cover plate 101, two beams of output light are generated, and the two beams of output light are focused by the lens 103 with the number 2 and 3, and the number 2 and 3 are irradiated. The two-line image is generated by the light sensitive array, and the processor can stitch the two-line image into a fingerprint image.

With the design disclosed above, the present invention can provide the following advantages:

1. The image stitching full-screen fingerprint detection method of the present invention can first detect a finger pressing position by using a touch detection procedure, and then activate an optical fingerprint detection circuit to detect a fingerprint, so as to obtain fingerprint information quickly, and Reduce the power consumption of the entire device.

2. The image stitching full-screen fingerprint detection method of the present invention can obtain fingerprint information more quickly and save power consumption when detecting a fingerprint on a large-sized display screen than the traditional full-screen fingerprint detection method.

3. The image stitching full-screen fingerprint detection method of the present invention can perform an image stitching operation on the two texture images measured when a finger is pressed between two sets of fingerprint detection areas to obtain a complete fingerprint. Information.

What is disclosed in this case is a preferred embodiment. For example, those who have partial changes or modifications that are derived from the technical ideas of this case and are easily inferred by those skilled in the art, do not depart from the scope of patent rights in this case.

To sum up, regardless of the purpose, method and effect, this case is showing its technical characteristics that are quite different from the conventional ones, and its first invention is practical, and it is also in line with the patent requirements of the invention. Granting patents at an early date will benefit society and feel good.

101‧‧‧ glass cover

101a‧‧‧first surface

101b‧‧‧Second surface

101c‧‧‧First side

101d‧‧‧Second side

101r‧‧‧Fingerprint recognition area

102‧‧‧light source

103‧‧‧ lens

103a‧‧‧Glass entrance

103b‧‧‧light surface

104‧‧‧photosensitive array

200‧‧‧ fingers

200a‧‧‧fingerprint

Step a‧‧‧ uses a touch detection circuit to execute a touch scanning process to detect a finger pressing area on a glass cover

Step b‧‧‧ Use a processor to find at least one fingerprint detection area covered by the finger pressing area

Step c‧‧‧ use the processor to activate at least one optical fingerprint detection circuit to obtain at least one texture image from the at least one fingerprint detection area, and include a plurality of fingerprint detection areas in the at least one fingerprint detection area Stitch a plurality of the texture images into a fingerprint image

FIG. 1 illustrates a side view of an optical fingerprint detection device according to the present invention. FIG. 2 is a top view of another optical fingerprint detection device according to the present invention. FIG. 3 is a flowchart of an embodiment of an image stitching full-screen fingerprint detection method according to the present invention. FIG. 4 is a schematic diagram of an operation scenario of a full-screen fingerprint detection method for image stitching according to the present invention.

Claims (5)

An image stitching full-screen fingerprint detection method includes the following steps: using a touch detection circuit to execute a touch scanning procedure to detect a finger pressing area on a glass cover; using a processor to find the finger pressing At least one fingerprint detection area covered by the area; and using the processor to activate at least one optical fingerprint detection circuit to obtain at least one texture image from the at least one fingerprint detection area, and in the at least one fingerprint detection area When a plurality of fingerprint detection areas are included, a plurality of the texture images are stitched into a fingerprint image. The image stitching full-screen fingerprint detection method according to item 1 of the scope of patent application, wherein the touch detection circuit is composed of a resistive touch detection circuit, a capacitive touch detection circuit, and a pressure type. A touch detection circuit selected by a group consisting of a touch detection circuit and an acoustic wave touch detection circuit. The image stitching full-screen fingerprint detection method according to item 1 of the patent application scope, wherein the optical fingerprint detection circuit includes a light source, a lens, and a photosensitive array, and when the optical fingerprint detection circuit is activated, it is By letting the output light of the light source propagate in the glass cover plate in a total reflection manner and irradiate a finger pressing position on the glass cover plate, thereby generating an output light carrying information of the fingerprint, and After the output light is focused by the lens, the photosensitive array is illuminated. The image stitching full-screen fingerprint detection method according to item 3 of the scope of patent application, wherein the light source is a light source that can change the direction of the output optical axis. A fingerprint detection system provides a fingerprint detection function by using the image stitching full-screen fingerprint detection method as described in any one of claims 1-4.