CN111552108B - Display device and fingerprint identification method thereof - Google Patents
Display device and fingerprint identification method thereof Download PDFInfo
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- CN111552108B CN111552108B CN202010511971.8A CN202010511971A CN111552108B CN 111552108 B CN111552108 B CN 111552108B CN 202010511971 A CN202010511971 A CN 202010511971A CN 111552108 B CN111552108 B CN 111552108B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- Human Computer Interaction (AREA)
- Computer Hardware Design (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
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Abstract
The invention discloses a display device and a fingerprint identification method thereof, wherein a backlight module is controlled to emit light only in a light emitting region corresponding to a touch position, and liquid crystal molecules in a liquid crystal layer in a deflection region corresponding to the light emitting region are controlled to deflect, so that light emitted by the backlight module in the light emitting region passes through a first polarizing layer, the liquid crystal layer and a second polarizing layer, and then forms a point light source on a light emitting surface of the second polarizing layer, thereby reducing stray light in the display device, relieving the interference of the stray light in the display device on a fingerprint identification signal, enabling a photosensitive detection layer not to reach signal quantity saturation before receiving the light reflected by a finger, enabling the light emitted by the point light source to be reflected to the photosensitive detection layer by the finger, obtaining a fingerprint pattern of the finger according to a fingerprint identification signal output by the photosensitive detection layer, and realizing accurate fingerprint identification.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display device and a fingerprint identification method thereof.
Background
Fingerprint identification provides huge effect in the aspect of protecting personal privacy as a biological identification mode, and electronic products in the market are almost equipped with a fingerprint identification system at present, and for example, automobiles, mobile phones, card punches and the like can have a fingerprint identification function.
However, due to the interference of the internal stray light, the photosensitive element reaches signal saturation when the light reflected by the finger is not received, and the fingerprint identification fails.
Disclosure of Invention
The embodiment of the invention provides a display device and a fingerprint identification method thereof, which are used for solving the problem of fingerprint identification failure caused by the interference of stray light inside the display device in the prior art.
The embodiment of the invention provides a fingerprint identification method of a display device, which comprises the following steps:
determining a touch position of a finger on a display surface of the display device;
according to the determined touch position, determining at least one light-emitting area corresponding to the touch position in a backlight module of the display device, and determining a deflection area corresponding to the light-emitting area in a liquid crystal layer; the liquid crystal layer is positioned on the light-emitting side of the backlight module;
controlling the backlight module to emit light only in the light emitting area, and controlling liquid crystal molecules in the deflection area in the liquid crystal layer to deflect, so that a point light source is formed on a light emitting surface of a second polarizing layer after light emitted by the backlight module in the light emitting area passes through a first polarizing layer, the liquid crystal layer and the second polarizing layer; the first polarizing layer is positioned between the backlight module and the liquid crystal layer, and the second polarizing layer is positioned on one side of the liquid crystal layer, which is far away from the backlight module;
receiving a fingerprint identification signal output by a photosensitive detection layer; the fingerprint identification signal is output after the photosensitive detection layer receives the reflected light of the point light source after the point light source irradiates to the finger; the photosensitive detection layer is positioned between the first polarizing layer and the second polarizing layer;
and determining the fingerprint pattern of the finger according to the fingerprint identification signal.
In a possible implementation manner, in the fingerprint identification method provided in the embodiment of the present invention, according to the determined touch position, at least two light emitting areas corresponding to the touch position are determined in a backlight module of the display device;
the determining the fingerprint pattern of the finger according to the fingerprint identification signal includes:
and forming the fingerprint pattern through image splicing according to the fingerprint identification signal.
In a possible implementation manner, in a fingerprint identification method provided by an embodiment of the present invention, determining a touch position of a finger on a display surface of a display device includes:
and determining the touch position of the finger according to the touch detection signal output by the touch detection layer in the display device.
In a possible implementation manner, in the fingerprint identification method provided in an embodiment of the present invention, the backlight module includes: the driving back plate and the plurality of light emitting diodes are uniformly distributed on the driving back plate;
the backlight module is controlled to emit light only in the light emitting area, and the backlight module comprises:
and controlling each light emitting diode in the light emitting area to emit light.
In a possible implementation manner, in the fingerprint identification method provided by the embodiment of the present invention, the light emitting area satisfies the following formula:
S≤2*tanθc*t1*M-2*t3*tanθ-4*h*tanθ；
the method comprises the following steps that S represents the maximum width of a light emitting area, thetac represents a total reflection critical angle between a protective cover plate and air, theta represents the maximum light emitting angle of a point light source, t1 represents the distance from the surface of one side, away from a backlight module, of a second polarizing layer to the surface of one side, away from the backlight module, of the protective cover plate, M represents the imaging magnification of the point light source, and t3 represents the distance from the surface of one side, close to the protective cover plate, of the backlight module to the surface of one side, close to the backlight module, of a photosensitive detection layer; h represents the distance between the surface of the liquid crystal layer on the side away from the backlight module and the surface of the photosensitive detection layer on the side away from the backlight module.
In a possible implementation manner, in the fingerprint identification method provided by the embodiment of the invention, S is more than 0 and less than or equal to 1.3mm.
In a possible implementation manner, in the fingerprint identification method provided by the embodiment of the present invention, the size of the point light source is smaller than 0.5mm × 0.5mm.
In a possible implementation manner, in the fingerprint identification method provided in the embodiment of the present invention, a distance between adjacent light emitting diodes in the backlight module is 100 μm;
the backlight module is controlled to emit light only in the light emitting area, and the backlight module comprises:
and controlling 13 multiplied by 13 light-emitting diode chips corresponding to the light-emitting regions to emit light.
In a possible implementation manner, in the fingerprint identification method provided in an embodiment of the present invention, the controlling the backlight module to emit light only in the light emitting area, and controlling liquid crystal molecules in the liquid crystal layer in the deflection area to deflect includes:
and in the interval time period of the display time periods of two adjacent frames, controlling the backlight module to emit light only in the light emitting region, and controlling the liquid crystal molecules in the deflection region in the liquid crystal layer to deflect.
An embodiment of the present invention further provides a display device, including: a memory, and a processor coupled with the memory;
the processor is configured to perform the above fingerprinting method based on instructions stored in the memory.
The invention has the following beneficial effects:
the display device and the fingerprint identification method thereof provided by the embodiment of the invention have the advantages that the backlight module is controlled to only emit light in the light emitting area corresponding to the touch position, and liquid crystal molecules in the deflection area corresponding to the light emitting area in the liquid crystal layer are controlled to deflect, so that the backlight module forms a point light source on the light emitting surface of the second polarizing layer after light emitted by the light emitting area passes through the first polarizing layer, the liquid crystal layer and the second polarizing layer, thereby reducing stray light in the display device, relieving the interference of the stray light in the display device on fingerprint identification signals, enabling the photosensitive detection layer not to reach signal quantity saturation before receiving the light reflected by a finger, enabling the light emitted by the point light source to be emitted to the photosensitive detection layer after being reflected by the finger, obtaining a fingerprint pattern of the finger according to the fingerprint identification signals output by the photosensitive detection layer, and realizing accurate fingerprint identification.
Drawings
FIG. 1 is a flow chart of a fingerprint identification method provided in an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a display device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a specific structure at a sub-pixel position in FIG. 2;
FIG. 4 is a schematic top view of a display device according to an embodiment of the present invention;
FIG. 5 is a schematic view of a backlight module according to an embodiment of the present invention;
FIG. 6 is a simplified block diagram of FIG. 2;
FIG. 7 is a schematic diagram of an optical path of a fingerprint identification process according to an embodiment of the present invention;
FIG. 8 is a schematic view of imaging a point source;
FIG. 9 is a second schematic diagram of the optical path of the fingerprint identification process according to the embodiment of the present invention;
fig. 10 is a schematic view of the backlight module emitting light in the light-emitting region in the eighth experiment in the embodiment of the invention;
FIG. 11 is a schematic diagram of a point light source formed in experiment eight according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a fingerprint image detected in the eighth experiment in the embodiment of the present invention.
Detailed Description
In the related art, the photosensitive element is integrated in the liquid crystal display device, in the fingerprint identification process, the light source emergent light is controlled, the light emitted by the light source can be reflected to the photosensitive element when a finger touches the screen, and the fingerprint image of the finger is collected by detecting the signal output by the photosensitive element. The following is a comparative analysis of the influence of stray light inside the display device on the signal quantity of the photosensitive element, in conjunction with table 1.
TABLE 1 Analyzer for analyzing influence of stray light in device on photosensitive element signal quantity
As shown in table 1, four experiments are performed to analyze the influence of the stray light inside the display device on the signal amount of the photosensitive element, and it should be noted that, in the first to fourth experiments, the remaining structures and parameters are the same except for the different points listed in the table, and the state of the backlight module in table 1 is "on", which indicates that all the backlights in the backlight module are turned on.
In the first experiment, the display device is not provided with the upper substrate and the protective cover plate of the liquid crystal box, the backlight module is in a closed state, in the second experiment, the display device is not provided with the protective cover plate, the white glass is arranged as the upper substrate of the liquid crystal box, and the backlight module is in an open state.
Compared with the second experiment, the third experiment shows that the color film substrate is used as the upper substrate of the liquid crystal box, and the comparison of the second experiment and the third experiment shows that the display device is provided with the color film substrate as the upper substrate of the liquid crystal box, so that the signal quantity of the photosensitive element is further increased.
Compared with the third experiment, the protective cover plate is arranged in the fourth experiment, and the third experiment and the fourth experiment show that the signal quantity of the photosensitive element is saturated due to the reflection action of the color film substrate and the protective cover plate.
As can be seen from the first to fourth experiments in table 1, when light is emitted from the light-emitting surface of the protective cover plate, the signal amount of the photosensitive element is already saturated due to reflection of the film layer inside the display device, and stray light inside the display device has a large interference to a detection result during fingerprint identification, even causes fingerprint identification failure.
Based on this, the embodiment of the invention provides a display device and a fingerprint identification method thereof, aiming at the problem that fingerprint identification fails due to interference of stray light inside the display device in the prior art.
The following describes specific embodiments of a display device and a fingerprint identification method thereof according to an embodiment of the present invention in detail with reference to the accompanying drawings. The thicknesses and shapes of the various film layers in the drawings are not to be considered as true proportions and are merely intended to illustrate the present invention.
An embodiment of the present invention provides a fingerprint identification method for a display device, as shown in fig. 1, including:
s101, determining a touch position of a finger on a display surface of a display device;
s102, determining at least one light emitting region corresponding to the touch position in a backlight module of the display device according to the determined touch position, and determining a deflection region corresponding to the light emitting region in a liquid crystal layer; the liquid crystal layer is positioned on the light-emitting side of the backlight module;
s103, controlling the backlight module to emit light only in the light emitting area, and controlling liquid crystal molecules in the deflection area in the liquid crystal layer to deflect, so that light emitted by the backlight module in the light emitting area passes through the first polarizing layer, the liquid crystal layer and the second polarizing layer, and then forms a point light source on a light emitting surface of the second polarizing layer; the first polarizing layer is positioned between the backlight module and the liquid crystal layer, and the second polarizing layer is positioned on one side of the liquid crystal layer, which is far away from the backlight module;
s104, receiving a fingerprint identification signal output by the photosensitive detection layer; the fingerprint identification signal is output after the photosensitive detection layer receives the reflected light of the point light source after the point light source irradiates to the finger; the photosensitive detection layer is positioned between the first polarizing layer and the second polarizing layer;
and S105, determining the fingerprint pattern of the finger according to the fingerprint identification signal.
According to the fingerprint identification method provided by the embodiment of the invention, the backlight module is controlled to only emit light in the light emitting area corresponding to the touch position, and liquid crystal molecules in the deflection area corresponding to the light emitting area in the liquid crystal layer are controlled to deflect, so that light emitted by the backlight module in the light emitting area passes through the first polarizing layer, the liquid crystal layer and the second polarizing layer, and then forms a point light source on the light emitting surface of the second polarizing layer, thereby reducing stray light inside the display device, relieving the interference of the stray light inside the display device on fingerprint identification signals, enabling the photosensitive detection layer not to reach signal quantity saturation before receiving the light reflected by fingers, enabling the light emitted by the point light source to pass through the photosensitive detection layer after being reflected by the fingers, obtaining the fingerprint pattern of the fingers according to the fingerprint identification signals output by the photosensitive detection layer, and realizing accurate fingerprint identification.
Fig. 2 is a schematic cross-sectional structure diagram of a display device in an embodiment of the invention, fig. 3 is a schematic detailed structure diagram of a sub-pixel position in fig. 2, fig. 4 is a schematic top-view structure diagram of the display device in the embodiment of the invention, and fig. 5 is a schematic structure diagram of a backlight module in the embodiment of the invention. The structure of the display device in the embodiment of the present invention will be described in detail below with reference to fig. 2 to 5.
As shown in fig. 2, the display device in the embodiment of the present invention includes: the backlight module 2, the array substrate 3 located on one side of the light-emitting surface of the backlight module 2, the color film substrate 4 located on one side of the array substrate 3 departing from the backlight module 2, the liquid crystal layer 5 located between the array substrate 3 and the color film substrate 4, the first polarizing layer 61 located on one side of the array substrate 3 close to the backlight module 2, the second polarizing layer 62 located on one side of the color film substrate 4 departing from the backlight module 3, and the protective cover plate 7 located on one side of the second polarizing layer 62 departing from the backlight module 4.
Wherein, the array substrate 3 includes: a first substrate 30, a line layer 31 on the first substrate 30, and a photosensitive detection layer 32 on a side of the line layer 31 facing away from the first substrate 30. The photosensitive detection layer 32 may include a plurality of photosensitive detection units 321, and in the fingerprint recognition process, the photosensitive detection units 321 may serve as photosensitive elements to detect light reflected by the finger, and each photosensitive detection unit 321 may be electrically connected to the circuit layer 31, and in the fingerprint recognition process, the fingerprint recognition signal output from each photosensitive detection unit 321 may be exclusively authorized through the circuit layer 31.
The color filter substrate 4 includes: the display device comprises a second substrate base plate 40, a flat layer 41 positioned on the second substrate base plate 40, a color film layer 42 positioned on one side of the flat layer 41, which is far away from the second substrate base plate 40, and a support column 43 positioned on one side of the color film layer 42, which is far away from the second substrate base plate 40. The color film layer 42 may include a filtering unit 421 and a light shielding unit 422, the filtering unit 421 may filter light to enable the sub-pixel position to emit light of a specific color, so as to implement color display, the light shielding unit 422 may shield a component affecting an aperture ratio in the display device, for example, the signal trace and the supporting column 43 may be disposed in a range of the light shielding unit 422, thereby avoiding affecting the aperture ratio of the display device.
In practical implementation, the first polarizing layer 61 and the first substrate 30 may be bonded by an optical Adhesive (OCA), and the second polarizing layer 62 and the second substrate 40, and the second polarizing layer 62 and the protective cover 7 may also be bonded by an optical Adhesive. The transmission axis directions of the first polarizing layer 61 and the second polarizing layer 62 are perpendicular to each other.
Referring to fig. 2, in the embodiment of the present invention, when it is detected that a finger F touches the surface of the protective cover 7, a touch position of the finger F is determined, at least one light emitting region P corresponding to the touch position is determined in the backlight module 2 according to the determined touch position, a deflection region N corresponding to the light emitting region P is determined in the liquid crystal layer 5, the backlight module 2 is controlled to emit light only in the light emitting region P, and liquid crystal molecules in the deflection region N are deflected, so that light emitted from the light emitting region P by the backlight module 2 passes through the first polarizing layer 61, the liquid crystal layer 5 and the second polarizing layer 62, a point light source E is formed on the light emitting surface of the second polarizing layer 62, and the light emitted from the point light source E is reflected to the photosensitive detection layer 32 by the finger F after being directed to the finger F, and the intensity of the light reflected by the valleys and the ridges of the finger F is different, so that a fingerprint pattern of the finger can be determined according to a fingerprint identification signal output by the photosensitive detection layer 32.
It should be noted that fig. 2 is only illustrated by an example of a light beam being emitted to the photosensitive detecting units 321, and the number of light beams reflected by the finger F is not limited, and in an implementation, the light beams reflected by the finger F may be emitted to the plurality of photosensitive detecting units 321 in multiple directions.
In addition, fig. 2 illustrates that the photosensitive detection layer 32 is located in the array substrate 3 as an example, in a specific implementation, the photosensitive detection layer 32 may also be disposed at other positions, for example, in the color filter substrate 4. Also, in order to avoid the photosensitive detection layer 32 from affecting the aperture ratio of the display device, each photosensitive detection unit 321 may be disposed within the range of the light shielding unit 422. Specifically, the photosensitive detection unit 321 may be a PIN photodiode, and may also be other photosensitive elements, which is not limited herein.
Referring to fig. 3, in the array substrate 3, the circuit layer 31 may include a first thin film transistor TFT1 and a second thin film transistor TFT2, wherein the first thin film transistor TFT1 may be electrically connected to the pixel electrode 312, and control the liquid crystal molecules in the liquid crystal layer 5 to deflect by controlling a voltage between the pixel electrode 312 and the common electrode 311, and the second thin film transistor TFT2 may be electrically connected to the photosensitive detection unit 321, and during the fingerprint identification process, the fingerprint identification signal output by the photosensitive detection unit 321 may be read through the second thin film transistor TFT 2. In order to prevent light from being emitted from the first substrate 30 side to the first thin film transistor TFT1 and the second thin film transistor TFT2 and to prevent a photo-generated current from affecting the thin film alert performance, a light shielding layer 33 is further provided on the first thin film transistor TFT1 and the second thin film transistor TFT2 on the side close to the first substrate 30.
As shown in fig. 4, the array substrate may further include a plurality of Gate lines Gate and a plurality of data lines Date, the photosensitive detection unit 321 may be located above the Gate lines Gate, the photosensitive detection unit 321 may be rectangular, a long side of the photosensitive detection unit 321 may be in the same extension direction as the Gate lines Gate, and the photosensitive detection unit 321 may also be in other shapes, which is not limited herein.
In an embodiment of the present invention, in order to facilitate control of the backlight module to emit light only in the light-emitting area, the backlight module may be a direct-type backlight module, and specifically, the backlight module may include: the backlight module comprises a driving back plate 21, a plurality of light emitting diodes 211 positioned on the driving back plate 21, an encapsulation layer 22 for encapsulating the light emitting diodes 211, a quantum dot film 23 positioned on the encapsulation layer 22, a first diffusion sheet 24 positioned on the quantum dot film 23, a first prism sheet 25 positioned on the first diffusion sheet 24, a second prism sheet 26 positioned on the first prism sheet 25, and a second diffusion sheet 25 positioned on the second prism sheet 26. The light emitting diodes 211 are uniformly distributed on the driving back plate 21, and the light emitting diodes 211 may be micro (Mine) light emitting diodes.
In order to more clearly illustrate the process of light emission of fingerprint recognition in the embodiment of the present invention, the structure of fig. 2 is simplified in fig. 6 to more clearly illustrate the distribution of light, specifically, when a finger F is detected to touch the surface of the protective cover 7, the touch position of the finger F is determined, at least one light emitting region P corresponding to the touch position is determined in the backlight module 2 according to the determined touch position, and a deflection region N corresponding to the light emitting region P is determined in the liquid crystal layer 5. The light emitting diodes in the light emitting region P of the backlight module 2 are controlled to emit light, and specifically, a high level signal is applied to the light emitting diodes in the light emitting region P to light the light emitting diodes in the light emitting region P. The other areas in the backlight module 2 (such as the areas Q1 and Q2 in the figure) are in a silent state. The liquid crystal molecules in the deflection region N in the liquid crystal layer 5 are controlled to deflect, for example, a high level signal may be applied to the liquid crystal molecules in the deflection region N, so that the light emitted from the light emitting region P can pass through the first polarizing layer, the liquid crystal layer, and the second polarizing layer and be emitted. However, the liquid crystal molecules in other regions of the liquid crystal layer 5 are not deflected, and for example, a low-level signal is applied to the liquid crystal molecules in other regions, so that light cannot be emitted from other regions, thereby forming a point light source E at the position of the second polarizing layer. Pointolite E continues transmission directive fingerprint identification interface upwards, protection apron 7 and finger F's contact interface promptly, and the light directive photosensitive detecting element 321 of reflection and scattering at the fingerprint identification interface converts the signal of telecommunication into after photosensitive detecting element 321 received light, because the light intensity that finger F valley and ridge reflect is different, consequently, can confirm the fingerprint pattern through detecting the fingerprint identification signal of photosensitive detecting element 321 output.
In specific implementation, in the fingerprint identification method provided in the embodiment of the present invention, in the step S102, according to the determined touch position, at least two light emitting areas corresponding to the touch position are determined in a backlight module of the display device;
the step S105 may include:
and forming a fingerprint pattern through image splicing according to the fingerprint identification signal.
The number of the light emitting areas P in the backlight module 2 can be determined according to the contact area between the finger F and the protective cover plate 7, and when the number of the light emitting areas P is more than or equal to two, a fingerprint pattern can be formed through image splicing processing to obtain a complete fingerprint pattern.
Specifically, in the fingerprint identification method provided in the embodiment of the present invention, the step S101 may include:
and determining the touch position of the finger according to a touch detection signal output by a touch detection layer in the display device.
The display device may be provided with a touch detection layer, an embedded touch detection layer, for example, the touch detection layer may be provided in a color film substrate or an array substrate, or may also be covered with a surface touch detection layer, which is not limited herein. When a finger touches the display surface of the display device, the touch position of the finger can be determined according to the touch detection signal output by the touch detection layer. In step S102, a light emitting area corresponding to the determined touch position may be determined according to the determined touch position, specifically, the touch position determined according to the touch detection layer may be a certain coordinate value or a certain area, the light emitting area may be set as an area including the touch position, for example, a certain range around the touch area may be taken as the light emitting area, and the light emitting area may be square or circular, or may be in other shapes, which is not limited herein. In order to form a point light source, the deflection region of the liquid crystal layer may be slightly smaller than the light emitting region, or may be slightly larger than the light emitting region.
Specifically, in the fingerprint identification method provided in the embodiment of the present invention, referring to fig. 5, the backlight module may include: the driving back plate 21 and a plurality of light emitting diodes 211 uniformly distributed on the driving back plate 21;
in step S103, the controlling the backlight module to emit light only in the light emitting region may include:
and controlling each light emitting diode in the light emitting area to emit light.
In a specific implementation, the light emitting diodes to be lit may be further determined according to the determined light emitting area, and the determination may be performed by combining the size of the light emitting diodes and the distance between adjacent light emitting diodes, so that in step S103, a high level signal may be applied to each determined light emitting diode to be lit, so as to light each light emitting diode, and the backlight module emits light in the light emitting area.
Fig. 7 and 9 are schematic light path diagrams of a fingerprint identification process in an embodiment of the present invention, fig. 8 is a schematic imaging diagram of a point light source, and with reference to fig. 7 to 9, in the fingerprint identification method provided in the embodiment of the present invention, a light emitting region P satisfies the following formula:
S≤2*tanθ c *t1*M-2*t3*tanθ-4*h*tanθ (1)；
wherein S represents the maximum width of the light emitting region P, θ c represents the critical angle of total reflection between the protective cover 7 and the air, which is generally about 42 °, θ represents the maximum light emitting angle of the point light source E (which is the same as the maximum light emitting angle of the light emitting region P), t1 represents the distance from the surface of the second polarizing layer on the side away from the backlight module 2 to the surface of the protective cover 7 on the side away from the backlight module 2, M represents the imaging magnification of the point light source E, and t3 represents the distance from the surface of the backlight module 2 on the side close to the protective cover 7 to the surface of the photosensitive detection layer 32 on the side close to the backlight module 2; h represents the distance between the surface of the liquid crystal layer on the side away from the backlight module 2 (i.e. the surface of the color film substrate 4 on the side close to the backlight module 2) and the surface of the photosensitive detection layer 32 on the side away from the backlight module 2.
When the light emitting region P satisfies the above formula, the interference of stray light inside the display device to the fingerprint identification result can be avoided, and the derivation process of the above formula is described in detail with reference to fig. 7 to 9.
In order to avoid the interference of stray light inside the display device to the fingerprint identification process, light rays except for light rays reflected by the finger need to be prevented from being emitted to the photosensitive detection unit, that is, light rays emitted by the backlight module need to be prevented from being emitted to the photosensitive detection unit after being reflected by a film layer inside the display device. Since the refractive indexes of most film layers in the display device are relatively similar, reflection between film layer interfaces can be ignored, and reflection of light rays emitted by the backlight module is greatly influenced by the color film substrate, so that in order to avoid interference of stray light inside the display device on a fingerprint identification process, the light rays emitted by the backlight module need to be prevented from being reflected by the color film substrate and then emitted to the photosensitive detection unit.
From the geometry in fig. 7, it can be derived:
S＝2*t*tanθ (2)；
wherein t represents the range from the surface of the backlight module close to the side of the protective cover plate to the surface of the second polarizing layer close to the side of the protective cover plate.
As shown in fig. 8, W1 is an actual fingerprint area obtained by the point light source E emitting to the fingerprint identification interface (i.e. the interface where the protective cover plate contacts with the finger), W2 represents a fingerprint image formed on the photosensitive detection layer after the light emitted from the point light source E is reflected by the finger, the fingerprint image W2 is located at the position of the photosensitive detection layer, and the fingerprint image W2 is an enlarged image of the actual fingerprint area W1, as can be seen from fig. 8, the actual fingerprint area W1 and the fingerprint image W2 are both annular, the inner edges of the actual fingerprint area W1 and the fingerprint image W2 are formed by total reflection of the light emitting to the fingerprint identification interface, and the outer edge is determined by the maximum light emitting angle of the point light source E. Referring to fig. 7, it can be seen that the distance between the point light source E and the actual fingerprint area W1 is t1, and the distance between the actual fingerprint area W1 and the fingerprint image W2 is t1+ t2, so that the imaging magnification of the point light source E can be determined according to the following formula:
M＝(t1+t2)/t1 (3)；
the imaging size of the point light source E is: l1 to L2; where L1 is the outer diameter of the fingerprint image W2 and L2 is the inner diameter of the fingerprint image W2, L1 and L2 can be determined according to the following formula:
L1＝2*tanθ*t1*M (4)；
L2＝2*tanθc*t1*M (5)；
fig. 9 shows a critical state in which the light emitted from the light-emitting region P is reflected by the color filter substrate 4 and then emitted to the edge of the photodetection layer 32, and referring to fig. 9, in order to make the light emitted from the light-emitting region P reflected by the color filter substrate 4 and then unable to be emitted to the photodetection layer 32, the following relation is required:
S′+2*L3≤L2 (6)；
S′＝S+2 t3*tanθ (7)；
L3＝2*h*tanθ (8)；
where S 'is the maximum radiation width of the light-emitting region P when transmitting to the plane where the photosensitive detection layer 32 is located, and L3 represents the radiation amplification of light reflected by the color film substrate 4 compared to the light-emitting region P of S'.
The above formula (1) can be obtained by combining the above formulas (2) to (8).
In specific implementation, in the embodiment of the present disclosure, the critical angle θ c of total reflection between the protective cover 7 and the air may be about 42 °, the magnification M may be between 2.5 and 3, t may be in a range of 0.8mm to 1mm, t3 may be in a range of 0.3mm to 0.5mm, and h may be in a range of 3um to 5um, and the size of the light emitting region P may be obtained according to the actual thickness of each film layer in the display device.
Specifically, in the fingerprint identification method provided in the embodiment of the present invention, S is greater than 0 and less than or equal to 1.3mm, that is, the maximum width of the light-emitting region P is preferably not more than 1.3mm, and the size of the formed point light source E can be controlled to be less than or equal to 0.5mm × 0.5mm by controlling the sizes of the light-emitting region and the deflection region, so as to prevent the light emitted from the light-emitting region P from being reflected by the color filter substrate 4 and then emitted to the photodetection layer 32.
In a specific implementation, in the fingerprint identification method provided in the embodiment of the present invention, a distance between adjacent light emitting diodes in the backlight module is 100 μm;
in step S103, the controlling the backlight module to emit light only in the light emitting region includes:
and controlling the light emitting of 13 multiplied by 13 light emitting diode chips corresponding to the light emitting region.
Therefore, the maximum width of the light-emitting area can be ensured not to exceed 1.3mm, and light emitted by the light-emitting area cannot irradiate the photosensitive detection layer after being reflected by the color film substrate.
In practical applications, in the fingerprint identification method provided in the embodiment of the present invention, the step S103 may include:
and in the interval time of the display time periods of two adjacent frames, controlling the backlight module to emit light only in the light-emitting region and controlling the liquid crystal molecules in the deflection region in the liquid crystal layer to deflect.
Therefore, the fingerprint identification process and the display process can be carried out in a time-sharing mode, and the display effect of the display device can be prevented from being influenced by the fingerprint identification process.
In order to prove that the fingerprint identification method provided by the embodiment of the invention can relieve the influence of stray light inside the display device on the fingerprint identification process, the embodiment of the invention also provides four groups of comparison experiments for verification, and the detailed description is provided in combination with table 2.
Table 2 shows the influence analysis table of stray light inside the device on the fingerprint identification process
As shown in table 2, it should be noted that the structures and parameters in the above experiments five to eight are the same except for the differences listed in the table. Comparing the fifth experiment with the sixth experiment, it can be known that, in the sixth experiment, the backlight module is completely opened, so that the signal quantity of the photosensitive detection layer is greatly increased and saturation is achieved, and therefore, when the backlight module is completely opened, the interference of stray light inside the display device on the detection result is large.
The contrast experiment six and the experiment seven know, compare with experiment six, control backlight unit is lighted the region and is opened only in the experiment seven, can make photosensitive detection layer's semaphore reduce by a wide margin, do not reach the saturation to can discern the fingerprint.
Comparing the seventh experiment with the eighth experiment, it can be known that when the finger touches the display surface of the display device in the eighth experiment, the signal quantity of the photosensitive detection layer is reduced to a certain extent due to the influence of the finger on the light, so that the fingerprint pattern of the finger can be obtained through the signal quantity change of the photosensitive detection layer.
In order to further prove the effect of the fingerprint identification method provided by the embodiment of the invention, fig. 10 to 12 show the actually measured schematic diagram in the eighth experiment, wherein fig. 10 is the schematic diagram of the backlight module emitting light in the light emitting region in the eighth experiment, fig. 11 is the schematic diagram of the point light source formed, and fig. 12 is the schematic diagram of the detected fingerprint image, which can be fully proved by fig. 10 to 12, the fingerprint identification method provided by the embodiment of the invention can accurately detect the fingerprint image.
Based on the same inventive concept, the embodiment of the invention also provides a display device, and the display device can be applied to any products or components with display functions, such as mobile phones, tablet computers, televisions, displays, notebook computers, digital photo frames, navigators and the like. Because the principle of solving the problems of the display device is similar to the fingerprint identification method, the implementation of the display device can refer to the implementation of the fingerprint identification method, and repeated parts are not repeated.
The display device provided by the embodiment of the invention comprises: a memory, and a processor coupled to the memory;
the processor is configured to perform the above described fingerprinting method based on instructions stored in the memory.
The display device and the fingerprint identification method thereof provided by the embodiment of the invention have the advantages that the backlight module is controlled to only emit light in the light emitting area corresponding to the touch position, and liquid crystal molecules in the deflection area corresponding to the light emitting area in the liquid crystal layer are controlled to deflect, so that the backlight module forms a point light source on the light emitting surface of the second polarizing layer after light emitted by the light emitting area passes through the first polarizing layer, the liquid crystal layer and the second polarizing layer, thereby reducing stray light in the display device, relieving the interference of the stray light in the display device on fingerprint identification signals, enabling the photosensitive detection layer not to reach signal quantity saturation before receiving the light reflected by fingers, enabling the light emitted by the point light source to emit to the photosensitive detection layer after being reflected by the fingers, obtaining a fingerprint pattern of the fingers according to the fingerprint identification signals output by the photosensitive detection layer, and realizing accurate fingerprint identification.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A fingerprint recognition method for a display device, comprising:
determining a touch position of a finger on a display surface of the display device;
according to the determined touch position, determining at least one light emitting area corresponding to the touch position in a backlight module of the display device, and determining a deflection area corresponding to the light emitting area in a liquid crystal layer; the liquid crystal layer is positioned on the light emitting side of the backlight module;
controlling the backlight module to only emit light in the light emitting area, and controlling liquid crystal molecules in the deflection area in the liquid crystal layer to deflect, so that light emitted by the backlight module in the light emitting area passes through the first polarizing layer, the liquid crystal layer and the second polarizing layer, and then a point light source is formed on a light emitting surface of the second polarizing layer; the first polarizing layer is positioned between the backlight module and the liquid crystal layer, and the second polarizing layer is positioned on one side of the liquid crystal layer, which is far away from the backlight module;
receiving a fingerprint identification signal output by a photosensitive detection layer; the fingerprint identification signal is output after the photosensitive detection layer receives the reflected light of the point light source after the point light source irradiates to the finger; the photosensitive detection layer is positioned between the first polarizing layer and the second polarizing layer;
determining a fingerprint pattern of a finger according to the fingerprint identification signal;
determining at least two light emitting areas corresponding to the touch positions in a backlight module of the display device according to the determined touch positions;
the determining the fingerprint pattern of the finger according to the fingerprint identification signal comprises:
forming the fingerprint pattern through image splicing according to the fingerprint identification signal;
the light emitting area satisfies the following formula:
S≤2*tanθc*t1*M-2*t3*tanθ-4*h*tanθ；
the method comprises the following steps that S represents the maximum width of a light emitting area, thetac represents a total reflection critical angle between a protective cover plate and air, theta represents the maximum light emitting angle of a point light source, t1 represents the distance from the surface of one side, away from a backlight module, of a second polarizing layer to the surface of one side, away from the backlight module, of the protective cover plate, M represents the imaging magnification of the point light source, and t3 represents the distance from the surface of one side, close to the protective cover plate, of the backlight module to the surface of one side, close to the backlight module, of a photosensitive detection layer; h represents the distance between the surface of the liquid crystal layer, which is far away from one side of the backlight module, and the surface of the photosensitive detection layer, which is far away from one side of the backlight module.
2. The fingerprint recognition method of claim 1, wherein determining the touch location of the finger on the display surface of the display device comprises:
and determining the touch position of the finger according to the touch detection signal output by the touch detection layer in the display device.
3. The fingerprint identification method according to claim 1, wherein the backlight module comprises: the driving back plate and the plurality of light emitting diodes are uniformly distributed on the driving back plate;
the backlight module is controlled to emit light only in the light emitting area, and the backlight module comprises:
and controlling each light emitting diode in the light emitting area to emit light.
4. The fingerprint identification method of claim 1, wherein 0 < S ≦ 1.3mm.
5. The fingerprint recognition method of claim 4, wherein the spot light source has a size of less than 0.5mm x 0.5mm.
6. The fingerprint identification method of claim 4, wherein a pitch between adjacent light emitting diodes in the backlight module is 100 μm;
the control of the backlight module to emit light only in the light emitting area comprises the following steps:
and controlling 13 multiplied by 13 light-emitting diode chips corresponding to the light-emitting regions to emit light.
7. The fingerprint identification method of claim 1, wherein the controlling the backlight module to emit light only in the light emitting region and controlling the liquid crystal molecules in the liquid crystal layer in the deflection region comprises:
and in the interval time period of the display time periods of two adjacent frames, controlling the backlight module to emit light only in the light emitting region, and controlling the liquid crystal molecules in the deflection region in the liquid crystal layer to deflect.
8. A display device, comprising: a memory, and a processor coupled with the memory;
the processor is configured to perform the fingerprinting method according to any one of claims 1 to 7, based on instructions stored in the memory.
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