CN111522162B - Display screen assembly and electronic equipment - Google Patents
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- CN111522162B CN111522162B CN201910104865.5A CN201910104865A CN111522162B CN 111522162 B CN111522162 B CN 111522162B CN 201910104865 A CN201910104865 A CN 201910104865A CN 111522162 B CN111522162 B CN 111522162B
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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
- G02F1/13338—Input devices, e.g. touch panels
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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
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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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
- 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
- G06V40/1365—Matching; Classification
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Abstract
The embodiment of the application provides a display screen assembly and electronic equipment. The display screen assembly comprises a display panel, an optical sensor and a controller, wherein the display panel is provided with a fingerprint identification area, the fingerprint identification area comprises a central area and an edge area surrounding the central area, the optical sensor is arranged corresponding to the fingerprint identification area, the optical sensor is used for collecting a fingerprint image of a target object, and when the fingerprint image is collected, the controller controls the brightness of the central area to be smaller than that of the edge area. The application provides a display screen subassembly helps improving the definition of the fingerprint image of gathering, and then improves fingerprint identification's sensitivity.
Description
Technical Field
The application relates to the technical field of electronics, especially, relate to a display screen subassembly and electronic equipment.
Background
With the development of display technology, display devices having a fingerprint recognition function are widely used. The user can use the finger touch display device's display screen to display device gathers and discerns user's fingerprint line. In the correlation technique, the optical fingerprint adopts the bright facula light filling of display screen height, and the optical fingerprint is because the optical characteristic of self lens, and the darker and bright condition in central part in marginal part can appear in the fingerprint image of formation, and overexposure can appear in the central part in the fingerprint line like this, and in the comparatively fuzzy phenomenon of marginal part formation of image, has reduced fingerprint identification's sensitivity.
Disclosure of Invention
The embodiment of the application provides a display screen assembly, display screen assembly includes display panel, optical sensor and controller, display panel has the fingerprint identification district, the fingerprint identification district is including the center district and encircle the marginal zone of center district, optical sensor corresponds the setting of fingerprint identification district, optical sensor is used for gathering the fingerprint image of target object, when carrying out fingerprint image collection, the controller control the luminance of center district is less than the luminance of marginal zone.
The display screen subassembly that this application embodiment provided includes display panel, optical sensor and controller, and optical sensor corresponds fingerprint identification district and sets up, and optical sensor is used for gathering target object's fingerprint image, and fingerprint identification district is including the center district and encircle the marginal zone in center district, when carrying out fingerprint image collection, the luminance that controller control center district is less than the luminance in marginal zone to can make the luminance in whole fingerprint identification district keep even unanimous, help improving the definition of the fingerprint image of gathering, and then improve fingerprint identification's sensitivity.
The embodiment of the application further provides an electronic device, the electronic device includes apron and as above the display screen subassembly, when carrying out fingerprint image collection, optical sensor is used for receiving and comes from the apron orientation the target light of display screen subassembly incidence, wherein, target light carries target object's fingerprint information, optical sensor turns into the signal of telecommunication that carries target object's fingerprint information with the target light that carries target object's fingerprint information, the controller generates target object's fingerprint image according to the signal of telecommunication that carries target object fingerprint information, the controller compares target object's fingerprint image with predetermineeing the fingerprint image to judge whether target object's fingerprint image matches with predetermineeing the fingerprint image.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first display screen assembly provided in an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a second display screen assembly provided in an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a third display screen assembly provided in an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a fourth display screen assembly provided in the embodiment of the present application.
Fig. 5 is a schematic structural diagram of a fifth display screen assembly provided in an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a sixth display screen assembly provided in an embodiment of the present application.
Fig. 7 is a schematic structural diagram of a seventh display screen assembly provided in an embodiment of the present application.
Fig. 8 is a schematic structural diagram of an eighth display screen assembly provided in an embodiment of the present application.
Fig. 9 is a schematic structural diagram of a ninth display screen assembly provided in an embodiment of the present application.
Fig. 10 is a schematic structural diagram of a tenth display screen assembly provided in an embodiment of the present application.
Fig. 11 is a schematic structural diagram of an eleventh display screen assembly provided in an embodiment of the present application.
Fig. 12 is a schematic structural diagram of a twelfth display screen assembly provided in an embodiment of the present application.
Fig. 13 is a schematic structural diagram of a first electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive effort based on the embodiments in the present application are within the scope of protection of the present application.
Referring to fig. 1, the display screen assembly 10 includes a display panel 100, an optical sensor 200 and a controller 300, the display panel 100 has a fingerprint identification area 100a, the fingerprint identification area 100a includes a central area 100b and an edge area 100c surrounding the central area 100b, the optical sensor 200 is disposed corresponding to the fingerprint identification area 100a, the optical sensor 200 is configured to collect a fingerprint image of a target object, and when collecting the fingerprint image, the controller 300 controls the brightness of the central area 100b to be less than the brightness of the edge area 100 c.
The display panel 100 may be a liquid crystal display panel or an organic light emitting diode display panel. The fingerprint identification area 100a may be circular, square, or other shapes.
The optical sensor 200 generally refers to a device that senses light energy from ultraviolet light to infrared light and converts the light energy into an electrical signal. The light signal recognized by the optical sensor 200 may be visible light or invisible light.
For example, the light signal is visible light, and the photosensitive layer of the optical sensor 200 generates a photoelectric effect when sensing the visible light. For example, the photosensitive layer of the optical sensor 200 may be a silicon-rich compound, including but not limited to silicon-rich silicon oxide (SiOx), silicon-rich silicon nitride (SiNy), silicon-rich silicon oxynitride (SiOxNy), and the like, where x and y are positive integers, such as x ═ 2 and y ═ 2. The input end of the optical sensor 200 is made of transparent conductive material. The transparent conductive material may be, but is not limited to, Indium Tin Oxide (ITO). The light signal enters the photosensitive layer of the optical sensor 200 through the input end of the optical sensor 200.
The controller 300 may be a central processing unit or a microprocessor.
The fingerprint identification area 100a is used for being touched by a target object to complete the acquisition and matching functions of a fingerprint image of the target object. Wherein the target object is a user. The optical sensor 200 is disposed corresponding to the fingerprint identification area 100a, and further, the optical sensor 200 may be disposed opposite to the central area 100b of the fingerprint identification area 100a, so that the optical sensor 200 may acquire a relatively complete fingerprint image, which is beneficial to improving the sensitivity of fingerprint identification.
In the related art, the optical fingerprint adopts the uniform light spot light supplement with the high brightness of the display screen, and the optical sensor 200 forms a fingerprint image with darker edge and brighter center due to the optical characteristics of the lens, so that the fingerprint lines are overexposed at the center of the fingerprint identification area 100a, and the imaging at the edge of the fingerprint identification area 100a is fuzzy, thereby reducing the sensitivity of fingerprint identification. The display screen assembly 10 provided by the embodiment of the application comprises a display panel 100, an optical sensor 200 and a controller 300, wherein the optical sensor 200 is arranged corresponding to a fingerprint identification area 100a, the optical sensor 200 is used for collecting a fingerprint image of a target object, the fingerprint identification area 100a comprises a central area 100b and an edge area 100c surrounding the central area 100b, and when the fingerprint image is collected, the controller 300 controls the brightness of the central area 100b to be smaller than that of the edge area 100c, so that the brightness of the whole fingerprint identification area 100a can be kept uniform, the definition of the collected fingerprint image is improved, and the sensitivity of fingerprint identification is improved.
Referring to fig. 2, the display panel 100 includes a liquid crystal layer 400, and when collecting a fingerprint image, the controller 300 controls the liquid crystal layer 400 corresponding to the central region 100b to be loaded with a first driving voltage U1, and controls the liquid crystal layer 400 corresponding to the edge region 100c to be loaded with a second driving voltage U2, wherein a voltage value of the first driving voltage U1 is less than a voltage value of the second driving voltage U2.
Specifically, the liquid crystal layers 400 corresponding to different regions of the fingerprint identification region 100a are controlled by using independent driving voltages, and when the voltage value of the first driving voltage U1 applied to the liquid crystal layer 400 corresponding to the central region 100b of the fingerprint identification region 100a is smaller than the voltage value of the second driving voltage U2 applied to the liquid crystal layer 400 corresponding to the edge region 100c of the fingerprint identification region 100a, under the same other conditions, the deflection angle of the liquid crystal layer 400 corresponding to the central region 100b is smaller than the deflection angle of the liquid crystal layer 400 corresponding to the edge region 100 c. At this time, the liquid crystal layer 400 corresponding to the edge area 100c passes through more light rays, so that the brightness of the edge area 100c is greater than that of the central area 100b, which is helpful for improving the definition of the acquired fingerprint image, and further improving the sensitivity of fingerprint identification.
In one embodiment, the voltage value of the first driving voltage U1 is a constant value, the voltage value of the second driving voltage U2 is also a constant value, and the voltage value of the first driving voltage U1 is smaller than the voltage value of the second driving voltage U2. Namely, the first driving voltage U1 applied to the liquid crystal layer 400 corresponding to the central region 100b and the second driving voltage U2 applied to the liquid crystal layer 400 corresponding to the edge region 100c are constant values. For example, the first driving voltage U1 applied to the liquid crystal layer 400 corresponding to the central region 100b is 3.8V, and the second driving voltage U2 applied to the liquid crystal layer 400 corresponding to the edge region 100c is 5V, so that the brightness of the central region 100b is less than that of the edge region 100c, and the brightness is complementary to the optical properties of the lens of the optical sensor 200, which is beneficial to improving the definition of the acquired fingerprint image, and further improving the sensitivity of fingerprint identification.
In another embodiment, the first driving voltage U1 is a set of a plurality of voltage values, the second driving voltage U2 is also a set of a plurality of voltage values, a maximum value of the plurality of voltage values in the first driving voltage U1 is smaller than a minimum value of the plurality of voltage values in the second driving voltage U2, and the first driving voltage U1 and the second driving voltage U2 decrease sequentially from the central region 100b toward the edge region 100 c. For example, the first driving voltage U1 includes the following voltage values: 3.8V, 4.0V and 4.2V, the second driving voltage U2 includes voltage values of: 4.6V, 4.8V and 5V, the voltage value of the boundary part of the edge area 100c and the central area 100b is 4.4V, the voltage value loaded by the liquid crystal layer 400 corresponding to the center part of the central area 100b is 3.8V, and the voltage value loaded by the liquid crystal layer 400 corresponding to the edge outline part of the edge area 100c is 5V, so that the brightness of the central area 100b is gradually improved towards the edge area 100c, and the acquired fingerprint image definition is favorably improved and the fingerprint identification sensitivity is improved by forming complementation with the optical property of the lens of the optical sensor 200.
Referring to fig. 3, the display panel 100 includes a liquid crystal layer 400, and when collecting a fingerprint image, the controller 300 controls the liquid crystal layer 400 corresponding to the central region 100b to be loaded with a first pulse modulation signal S1, and controls the liquid crystal layer 400 corresponding to the edge region 100c to be loaded with a second pulse modulation signal S2, wherein a duty ratio of the first pulse modulation signal S1 is smaller than a duty ratio of the second pulse modulation signal S2.
The pulse modulation signal is a discrete signal, has various shapes, and is characterized in that the waveforms are discontinuous on the time axis (obvious intervals exist between the waveforms) but have certain periodicity compared with common analog signals (such as sine waves). The most common pulse wave is a rectangular wave (i.e., a square wave). The pulse modulation signal can be used to represent information, and can also be used as a carrier wave, such as Pulse Code Modulation (PCM) in pulse modulation, Pulse Width Modulation (PWM), and the like, and can also be used as a clock signal for various digital circuits and high-performance chips.
Duty cycle refers to the percentage of time that a circuit is turned on for the entire circuit duty cycle. For a pulse width modulated signal, the duty cycle of the pulse width modulated signal is equal to the ratio of the pulse width to the signal period. For example, the pulse width of the first pwm signal S1 is 1 μ S, and the signal period is 4 μ S, so that the duty cycle of the first pwm signal S1 is 1/4 ═ 0.25.
In one embodiment, the first pulse modulation signal S1 and the second pulse modulation signal S2 are both square wave signals, the period of the waveform corresponding to the first pulse modulation signal S1 is consistent with the period of the waveform corresponding to the second pulse modulation signal S2, and the width of the waveform corresponding to the first pulse modulation signal S1 is smaller than the width of the waveform of the second pulse modulation signal S2. At this time, the duty ratio of the first pulse modulation signal S1 is smaller than the duty ratio of the second pulse modulation signal S2, which is helpful for improving the brightness of the edge area 100c and the central area 100b, and the brightness of the edge area 100c can be made larger than the brightness of the central area 100b, so as to form a complementary relationship with the optical properties of the lens of the optical sensor 200, which is helpful for improving the definition of the acquired fingerprint image, and further improving the recognition sensitivity of the optical fingerprint.
It is understood that, in other embodiments, the periods of the first pulse modulation signal S1 and the second pulse modulation signal S2 may be different, and the duty ratio of the first pulse modulation signal S1 may be kept smaller than the duty ratio of the second pulse modulation signal S2.
By adjusting the duty ratios of the first pulse modulation signal S1 applied to the liquid crystal layer 400 corresponding to the central region 100b and the second pulse modulation signal S2 applied to the liquid crystal layer 400 corresponding to the edge region 100c, the lengths of the time for which the two ends of the liquid crystal layer 400 corresponding to the central region 100b are energized and the lengths of the time for which the two ends of the liquid crystal layer 400 corresponding to the edge region 100c are energized can be changed. When the duty ratio of the first pulse modulation signal S1 is smaller than the duty ratio of the second pulse modulation signal S2, it is indicated that the duration of the voltage applied to the liquid crystal layer 400 corresponding to the central region 100b is smaller than the duration of the voltage applied to the liquid crystal layer 400 corresponding to the edge region 100c, so that the liquid crystal layer 400 corresponding to the edge region 100c can pass through more light, which is beneficial to improving the brightness of the edge region 100c, and thus is complementary to the optical property of the optical sensor 200 that the edge is dark and the middle is bright, which is beneficial to improving the definition of the acquired fingerprint image, and further improving the sensitivity of optical fingerprint identification.
Referring to fig. 4, in an embodiment, the display panel 100 includes an array substrate 110 and a color filter substrate 120 that are stacked and spaced apart from each other, a pixel electrode 130 is disposed on one side of the array substrate 110 adjacent to the color filter substrate 120, a common electrode 140 is disposed on one side of the color filter substrate 120 adjacent to the array substrate 110, and the liquid crystal layer 400 is located between the pixel electrode 130 and the common electrode 140.
The array substrate 110 may be a flexible substrate, and the flexible substrate is formed by compounding a polyimide film (PI) or a polyester film and a copper foil. Because of the excellent properties of high temperature soldering resistance, high strength, high modulus, flame retardance and the like, the polyimide has outstanding thermal stability, good radiation resistance and chemical stability and excellent mechanical property as a high polymer material.
Specifically, when the liquid crystal layer 400 is located between the pixel electrode 130 and the common electrode 140, a voltage difference is formed between the pixel electrode 130 and the common electrode 140, so that the liquid crystal layer 400 located between the pixel electrode 130 and the common electrode 140 generates a deflection angle, thereby changing the amount of light passing through the liquid crystal layer 400. When the voltage difference recorded at the two ends of the liquid crystal layer 400 corresponding to the central area 100b is smaller than the voltage difference loaded at the two ends of the liquid crystal layer 400 corresponding to the edge area 100c, the brightness of the central area 100b can be smaller than that of the edge area 100c, and then the brightness is complementary to the optical property of the optical sensor 200 that the center of the lens is bright and the edge is dark, which is beneficial to improving the definition of the collected fingerprint image and further improving the sensitivity of optical fingerprint identification.
Referring to fig. 5, in another embodiment, the display panel 100 includes an array substrate 110 and a color filter substrate 120 that are stacked and spaced apart from each other, and further includes a pixel electrode 130 and a common electrode 140, the pixel electrode 130 and the common electrode 140 are both disposed on the array substrate 110, and the liquid crystal layer 400 is located between the pixel electrode 130 and the color filter substrate 120.
Specifically, the pixel electrode 130 and the common electrode 140 are disposed at an interval on the same layer and are both disposed on the array substrate 110, and a voltage difference is formed between the pixel electrode 130 and the common electrode 140, so that the liquid crystal layer 400 disposed between the pixel electrode 130 and the color filter substrate 120 generates different deflection angles, and further, the amount of light passing through the liquid crystal layer 400 is changed. Moreover, since the pixel electrode 130 and the common electrode 140 are disposed at an interval on the same layer, the thickness of the display panel 100 can be reduced compared to the manner in which the pixel electrode 130 and the common electrode 140 are disposed at an interval in a stacked manner, which is helpful for realizing the light and thin design of the display panel 100. When the voltage difference recorded by the liquid crystal layer 400 corresponding to the central area 100b is smaller than the voltage difference loaded by the liquid crystal layer 400 corresponding to the edge area 100c, the brightness of the central area 100b can be smaller than that of the edge area 100c, and the brightness is complementary to the optical property of the optical sensor 200, such that the definition of the collected fingerprint image can be improved, and the sensitivity of the optical fingerprint identification can be improved. Wherein, a voltage difference exists between two adjacent u1, u2, u3 and u 4. In one embodiment, the voltage difference between u1 and u2 is a first difference, the voltage difference between u3 and u4 is a second difference, the first difference is equal to the second difference, and the voltage difference between u2 and u3 is a third difference, and the first difference is greater than the third difference.
Referring to fig. 6, the display panel assembly 10 further includes a backlight module 500, the backlight module 500 includes a light guide plate 510 and a light source 520 disposed at one side of the light guide plate 510, light emitted from the light source 520 is transmitted to the display panel 100 through the light guide plate 510, a distance between a portion of the light guide plate 510 facing the central region 100b and the display panel 100 is a first distance d1, a distance between a portion of the light guide plate 510 facing the edge region 100c and the display panel 100 is a second distance d2, and the first distance d1 is greater than the second distance d 2.
In one embodiment, the light guide plate 510 is formed with a groove 510a, and the groove 510a faces the central area 100b, so that a first distance d1 between a portion of the light guide plate 510 facing the central area 100b and the display panel 100 is greater than a second distance d2 between a portion of the light guide plate 510 facing the edge area 100c and the display panel 100. Because light loss exists in the transmission of light in the air, the light reaching the central area 100b is less than the light reaching the edge area 100c, so that the brightness of the edge area 100c is greater than that of the central area 100b, and the brightness is complementary with the middle bright edge darkness of the optical property of the lens of the optical sensor 200, which is beneficial to improving the definition of the acquired fingerprint image and improving the sensitivity of optical fingerprint identification.
In another embodiment, the light guide plate 510 is provided with scattering particles at a portion corresponding to the central region 100b, and the scattering particles are used for scattering the light emitted from the light guide plate 510, so that the light emitted from the light guide plate 510 is emitted in all directions. Because the light guide plate 510 is provided with scattering particles at the position corresponding to the central area 100b, and the light guide plate 510 is not provided with scattering particles at the position corresponding to the edge area 100c, the light emitted from the light guide plate 510 at the position corresponding to the central area 100b is scattered, so that the amount of the light reaching the central area 100b is less than that of the light reaching the edge area 100c, and the brightness of the edge area 100c is greater than that of the central area 100b, and further the light is complementary to the bright edge and dark in the middle of the optical property of the lens of the optical sensor 200, so that the fingerprint identification area 100a presents uniform brightness, which is helpful for improving the definition of the acquired fingerprint image, and further improving the sensitivity of optical fingerprint identification.
Further, the density of the scattering particles is gradually reduced from the center of the central area 100b toward the edge of the central area 100b, and the greater the density of the scattering particles, the more obvious the scattering effect on the light is, so that the light is not easily converged, and the amount of the light reaching the central area 100b is more favorably reduced, so that the brightness of the central area 100b is less than that of the edge area 100c, and is complementary to the optical property of the lens of the optical sensor 200, which is favorable for improving the definition of the acquired fingerprint image, and further improving the sensitivity of optical fingerprint identification.
In yet another embodiment, the light guide plate 510 is provided with a light shielding layer at a position corresponding to the central area 100b, and the light shielding layer is used for absorbing a portion of light, so as to reduce the amount of light reaching the central area 100b under the same condition, so that the brightness of the central area 100b is less than that of the edge area 100c, and the brightness is complementary to the optical property of the lens of the optical sensor 200, which is helpful for improving the definition of the acquired fingerprint image, and further improving the sensitivity of optical fingerprint identification. The light shielding layer may be a filter or a polarizer.
Referring to fig. 7, the display panel assembly 10 further includes a backlight module 500, the backlight module 500 includes a light guide plate 510 and a light source 520, the light source 520 is located at a side of the light guide plate 510 away from the display panel 100, light emitted from the light source 520 is transmitted to the display panel 100 through the light guide plate 510, and the light source 520 is disposed corresponding to the edge area 100 c.
Specifically, since the light source 520 is located at a side of the light guide plate 510 away from the display panel 100, and the light source 520 is disposed corresponding to the edge area 100c, a distance between the light source 520 and the edge area 100c is smaller than a distance between the light source 520 and the central area 100 b. At this time, the light from the light source 520 may be more irradiated to the edge region 100c, so that the brightness of the edge region 100c and the central region 100b is simultaneously improved under the same condition, and the brightness improvement of the edge region 100c is more obvious. And then form complementation with the middle bright edge of the optical property of the lens of the optical sensor 200, which is helpful to improve the definition of the collected fingerprint image, and further improve the sensitivity of optical fingerprint identification.
In one embodiment, the light source 520 is annular and surrounds the central region 100 b. The light source 520 includes a plurality of point light sources, and a plurality of point light sources are uniformly distributed in a ring shape, and can uniformly illuminate the edge area 100c, so that the edge area is complementary with the bright edge in the middle of the optical property of the lens of the optical sensor 200, which is helpful for improving the definition of the collected fingerprint image, and further improving the sensitivity of optical fingerprint identification.
Referring to fig. 8, the display panel 100 further includes a color resist layer 150, and a portion of the color resist layer 150 facing the fingerprint identification area 100a is provided with green color resists 151 and blue color resists 152 arranged at intervals.
Specifically, it can make the background noise of display panel 100 and the fingerprint image of gathering more balanced to set up green color resistance 151 at the corresponding position of fingerprint identification area 100a, and can make the contrast of the fingerprint image of gathering more obvious at blue color resistance 152, consequently, adopt the form that green color resistance 151 and blue color resistance 152 interval were arranged, can improve the contrast of the fingerprint image of gathering, further improve the quality of the fingerprint image of gathering, help improving the identification precision of optics fingerprint.
In one embodiment, the light emitting areas of the green color resistor 151 and the blue color resistor 152 are consistent. At the moment, the collected fingerprint image has low noise and high contrast, so that the collected fingerprint image is more harmonious, and the identification precision of the optical fingerprint is improved.
Referring to fig. 9, the portion of the color resist layer 150 opposite to the edge area 100c is further provided with a white color resist 153.
Specifically, the white color resistor 153 is disposed at a portion of the color resistor layer 150 corresponding to the edge area 100c, where the white color resistor 153 is used to improve the brightness of the edge area 100c, and the white color resistor 153 is not disposed at a portion of the color resistor layer 150 corresponding to the central area 100b, so that under the same condition, the brightness of the edge area 100c is brighter than that of the central area 100b, and further forms a complementary effect with the middle bright edge of the optical property of the lens of the optical sensor 200, which is helpful to improve the definition of the acquired fingerprint image, and further improve the sensitivity of the optical fingerprint identification.
Referring to fig. 10, the display panel 100 includes an array substrate 110 and a color filter substrate 120 that are stacked and spaced apart from each other, a pixel electrode 130 is disposed on a side of the array substrate 110 adjacent to the color filter substrate 120, and a common electrode 140 is disposed on a side of the color filter substrate 120 adjacent to the array substrate 110.
The display panel 100 further includes a thin film transistor 160 on the array substrate 110, and the color resistance layer 150 and the thin film transistor 160 are simultaneously disposed on the array substrate 110.
Specifically, the color resistance layer 150 includes a plurality of color resistance units, a black matrix 170 is disposed between adjacent color resistance units, and the black matrix 170 is used to isolate the adjacent color resistance units, thereby avoiding color collision between the adjacent color resistance units and ensuring the display quality of the display panel 100.
In one embodiment, the optical sensor 200 is located between two adjacent pixel electrodes 130.
The optical sensor 200 and the pixel electrode 130 are disposed on the same layer, and the optical sensor 200 and the thin film transistor 160 electrically connected to the pixel electrode 130 share a portion of the data line 102.
Specifically, the optical sensor 200 and the pixel electrode 130 may be formed together in the same process, which contributes to saving the process.
The thin film transistor 160 includes a gate 161, a first terminal 162, a second terminal 163 and a channel layer 164, the optical sensor 200 includes an input terminal 200a and an output terminal 200b, the first terminal 162 is electrically connected to the input terminal 200a, the second terminal 163 is electrically connected to one data line 102 of the green color resistor 151, the output terminal 200b is electrically connected to another data line 102 of the green color resistor 151, wherein the first terminal 162 is a source 162a, and the second terminal 163 is a drain 163 a; alternatively, the first end 162 is a drain 162a, the second end 163 is a source 163a, and the source 162a and the drain 163a are spaced apart and contact the channel layer 164, respectively. The first end 162 is taken as a source 162a and the second end 163 is taken as a drain 163a for explanation. The data line 102 of the green color resistor 151 and the drain electrode 163a are disposed on the same layer, and the optical sensor 200 is electrically connected to the data line 102 to realize multiplexing of the data line 102, which is helpful for light and thin design of electronic devices when the display panel assembly 10 is applied to the electronic devices. In this embodiment, the data line 102 is illustrated above the first end 162 of the thin film transistor 160, and it is understood that the data line 102 and the first end 162 of the thin film transistor 160 may be disposed on the same layer.
Further, a black matrix 170 is disposed between the adjacent optical sensor 200 and the pixel electrode 130, and the black matrix 170 is used for shielding the data line 102 shared by the optical sensor 200 and the thin film transistor 160, so as to prevent the data line 102 from being exposed outside, and thus, when the display panel assembly 10 is applied to an electronic device, the uniformity of the appearance of the electronic device is ensured.
With reference to fig. 11, the display panel 100 includes an anode layer 181, a light emitting layer 182, and a cathode layer 183 sequentially stacked, wherein a driving voltage is applied between the anode layer 181 and the cathode layer 183 to enable the light emitting layer 182 to emit light, the controller 300 controls the light emitting layer 182 corresponding to the central region 100b to be applied with a first voltage U3, and controls the light emitting layer 182 corresponding to the edge region 100c to be applied with a second voltage U4, wherein a voltage value of the first voltage U3 is less than a voltage value of the second voltage U4.
The display panel 100 may be a flexible display panel 100.
Specifically, the light emitting layers 182 corresponding to different areas of the fingerprint identification area 100a are controlled by using independent driving voltages, and when the voltage value of the first voltage U3 applied to the light emitting layer 182 corresponding to the central area 100b of the fingerprint identification area 100a is smaller than the voltage value of the second voltage U4 applied to the light emitting layer 182 corresponding to the edge area 100c of the fingerprint identification area 100a, under the same other conditions, the light emitting luminance of the light emitting layer 182 corresponding to the central area 100b is smaller than the light emitting luminance of the light emitting layer 182 corresponding to the edge area 100c, which is beneficial to improving the definition of the acquired fingerprint image and further improving the sensitivity of fingerprint identification.
With reference to fig. 12, a portion of the light emitting layer 182 opposite to the central region 100b is provided with a green sub-pixel 184 and a blue sub-pixel 185, and a portion of the light emitting layer 182 opposite to the edge region 100c is provided with a green sub-pixel 184, a blue sub-pixel 185 and a white sub-pixel 186.
Specifically, the green sub-pixels 184 are disposed at the corresponding positions of the fingerprint identification area 100a, so that the background noise of the display panel 100 and the collected fingerprint image are relatively balanced, and the blue sub-pixels 185 can make the contrast of the collected fingerprint image more obvious, so that the green sub-pixels 184 and the blue sub-pixels 185 are arranged at intervals, so that the contrast of the collected fingerprint image can be improved, the quality of the collected fingerprint image is further improved, and the identification accuracy of the optical fingerprint is improved.
In one embodiment, the light emitting area size of the green sub-pixel 184 and the blue sub-pixel 185 are consistent. At the moment, the collected fingerprint image has low noise and high contrast, so that the collected fingerprint image is more harmonious, and the identification precision of the optical fingerprint is improved.
The light-emitting layer 182 is further provided with a white sub-pixel 186 at a position facing the edge region 100 c.
Specifically, the white sub-pixel 186 is disposed at a portion of the light emitting layer 182 corresponding to the edge area 100c, where the white sub-pixel 186 is used to improve the brightness of the edge area 100c, and the white sub-pixel 186 is not disposed at a portion of the light emitting layer 182 corresponding to the central area 100b, so that under the same condition, the brightness of the edge area 100c is brighter than that of the central area 100b, and is complementary to the bright edge in the middle of the optical property of the lens of the optical sensor 200, which is helpful for improving the definition of the acquired fingerprint image, and further improving the sensitivity of optical fingerprint identification.
Referring to fig. 13, the electronic device 1 includes a cover plate 20 and the display screen assembly 10 provided in any of the above embodiments, when acquiring a fingerprint image, the optical sensor 200 is configured to receive a target light from the cover plate 20 and incident toward the display screen assembly 10, where the target light carries fingerprint information of a target object, the optical sensor 200 converts the target light carrying the fingerprint information of the target object into an electrical signal carrying the fingerprint information of the target object, the controller 300 generates a fingerprint image of the target object according to the electrical signal carrying the fingerprint information of the target object, and the controller 300 compares the fingerprint image of the target object with a preset fingerprint image to determine whether the fingerprint image of the target object matches the preset fingerprint image.
The electronic device 1 is a device that is composed of electronic components such as an integrated circuit, a transistor, and an electron tube, and functions by applying an electronic technology (including software), and the common electronic device 1 includes: smart phones, tablet computers, notebook computers, palm computers, Mobile Internet Devices (MID), wearable devices such as smart watches, smart bracelets, pedometers, and the like. The cover plate 20 is a glass cover plate.
In the related art, the optical fingerprint adopts the uniform light spot light supplement with the high brightness of the display screen, and the optical sensor 200 forms a fingerprint image with darker edge and brighter center due to the optical characteristics of the lens, so that the fingerprint lines are overexposed at the center of the fingerprint identification area 100a, and the imaging at the edge of the fingerprint identification area 100a is fuzzy, thereby reducing the sensitivity of fingerprint identification. The display screen assembly 10 provided by the embodiment of the application comprises a display panel 100, an optical sensor 200 and a controller 300, wherein the optical sensor 200 is arranged corresponding to a fingerprint identification area 100a, the optical sensor 200 is used for collecting a fingerprint image of a target object, the fingerprint identification area 100a comprises a central area 100b and an edge area 100c surrounding the central area 100b, and when the fingerprint image is collected, the controller 300 controls the brightness of the central area 100b to be smaller than that of the edge area 100c, so that the definition of the collected fingerprint image is improved, and the sensitivity of fingerprint identification is further improved.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (16)
1. A display screen assembly is characterized by comprising a display panel, an optical sensor and a controller, wherein the display panel is provided with a fingerprint identification area, the fingerprint identification area comprises a central area and an edge area surrounding the central area, the optical sensor is arranged corresponding to the fingerprint identification area, the optical sensor is used for collecting a fingerprint image of a target object, and when the fingerprint image is collected, the controller controls the brightness of the central area to be smaller than that of the edge area;
when fingerprint image acquisition is carried out, the controller controls the liquid crystal layer corresponding to the central area to be loaded with a first driving voltage and controls the liquid crystal layer corresponding to the edge area to be loaded with a second driving voltage, wherein the voltage value of the first driving voltage is smaller than that of the second driving voltage;
or,
when fingerprint image acquisition is carried out, the controller controls the liquid crystal layer corresponding to the central area to be loaded with a first pulse modulation signal and controls the liquid crystal layer corresponding to the edge area to be loaded with a second pulse modulation signal, wherein the duty ratio of the first pulse modulation signal is smaller than that of the second pulse modulation signal.
2. The display screen assembly of claim 1, wherein the display panel comprises an array substrate and a color film substrate which are stacked and spaced apart from each other, a pixel electrode is disposed on one side of the array substrate adjacent to the color film substrate, a common electrode is disposed on one side of the color film substrate adjacent to the array substrate, and the liquid crystal layer is disposed between the pixel electrode and the common electrode.
3. The display screen assembly of claim 1, wherein the display panel comprises an array substrate and a color film substrate which are stacked and arranged at intervals, and further comprises a pixel electrode and a common electrode, wherein the pixel electrode and the common electrode are both arranged on the array substrate, and the liquid crystal layer is located between the pixel electrode and the color film substrate.
4. The display panel assembly of claim 1, further comprising a backlight assembly, the backlight assembly comprising a light guide plate and a light source disposed on one side of the light guide plate, wherein light emitted from the light source is transmitted through the light guide plate to the display panel, a distance between a portion of the light guide plate facing the central region and the display panel is a first distance, a distance between a portion of the light guide plate facing the edge region and the display panel is a second distance, and the first distance is greater than the second distance.
5. The display panel assembly of claim 1, further comprising a backlight module including a light guide plate and a light source, wherein the light source is disposed on a side of the light guide plate away from the display panel, light emitted from the light source is transmitted to the display panel through the light guide plate, and the light source is disposed corresponding to the edge region.
6. The display screen assembly of claim 5, wherein the light source is annular and surrounds the central region.
7. The display screen assembly of claim 1, wherein the display panel further comprises a color resistance layer, and a portion of the color resistance layer facing the fingerprint identification area is provided with a green color resistance and a blue color resistance which are arranged at intervals.
8. The display screen assembly of claim 7, wherein the display panel comprises an array substrate and a color film substrate which are stacked and spaced apart from each other, a pixel electrode is disposed on one side of the array substrate adjacent to the color film substrate, and a common electrode is disposed on one side of the color film substrate adjacent to the array substrate.
9. The display panel assembly of claim 7, wherein the display panel includes an array substrate and a thin film transistor on the array substrate, and the color resist layer is disposed on the array substrate simultaneously with the thin film transistor.
10. The screen assembly of claim 7 wherein a white color resist is disposed on the portion of the color resist layer opposite the border region.
11. The display screen assembly of claim 7, wherein the green color resistor and the blue color resistor have a uniform light emitting area.
12. A display screen assembly is characterized by comprising a display panel, an optical sensor and a controller, wherein the display panel is provided with a fingerprint identification area, the fingerprint identification area comprises a central area and an edge area surrounding the central area, the optical sensor is arranged corresponding to the fingerprint identification area, the optical sensor is used for collecting a fingerprint image of a target object, and when the fingerprint image is collected, the controller controls the brightness of the central area to be smaller than that of the edge area;
the display screen assembly further comprises a backlight module, the backlight module comprises a light guide plate and a light source positioned on one side of the light guide plate, light rays emitted by the light source are transmitted to the display panel through the light guide plate, the distance between the part of the light guide plate, which faces the central area, and the display panel is a first distance, the distance between the part of the light guide plate, which faces the marginal area, and the display panel is a second distance, and the first distance is greater than the second distance;
or,
the display screen assembly further comprises a backlight module, the backlight module comprises a light guide plate and a light source, the light source is located on one side, away from the display panel, of the light guide plate, light rays emitted by the light source are transmitted to the display panel through the light guide plate, and the light source corresponds to the edge area.
13. A display screen assembly is characterized by comprising a display panel, an optical sensor and a controller, wherein the display panel is provided with a fingerprint identification area, the fingerprint identification area comprises a central area and an edge area surrounding the central area, the optical sensor is arranged corresponding to the fingerprint identification area, the optical sensor is used for collecting a fingerprint image of a target object, and when the fingerprint image is collected, the controller controls the brightness of the central area to be smaller than that of the edge area;
the display panel further comprises a color resistance layer, and green color resistances and blue color resistances which are arranged at intervals are arranged at positions, opposite to the fingerprint identification area, of the color resistance layer.
14. A display screen assembly is characterized by comprising a display panel, an optical sensor and a controller, wherein the display panel is provided with a fingerprint identification area, the fingerprint identification area comprises a central area and an edge area surrounding the central area, the optical sensor is arranged corresponding to the fingerprint identification area, the optical sensor is used for collecting a fingerprint image of a target object, and when the fingerprint image is collected, the controller controls the brightness of the central area to be smaller than that of the edge area;
wherein,
the display panel comprises an anode layer, a light emitting layer and a cathode layer which are sequentially stacked, wherein a driving voltage is loaded between the anode layer and the cathode layer so that the light emitting layer emits light, the controller controls the light emitting layer corresponding to the central region to be loaded with a first voltage, and controls the light emitting layer corresponding to the edge region to be loaded with a second voltage, wherein the voltage value of the first voltage is smaller than that of the second voltage.
15. The display screen assembly of claim 14, wherein the portion of the light emitting layer facing the central region is provided with a green subpixel and a blue subpixel, and the portion of the light emitting layer facing the edge region is provided with a green subpixel, a blue subpixel and a white subpixel.
16. An electronic device, comprising a cover plate and a display screen assembly as claimed in any one of claims 1 to 15, wherein the optical sensor is configured to receive a target light from the cover plate incident toward the display screen assembly when performing fingerprint image acquisition, wherein the target light carries fingerprint information of a target object, the optical sensor converts the target light carrying the fingerprint information of the target object into an electrical signal carrying the fingerprint information of the target object, the controller generates a fingerprint image of the target object according to the electrical signal carrying the fingerprint information of the target object, and the controller compares the fingerprint image of the target object with a preset fingerprint image to determine whether the fingerprint image of the target object matches the preset fingerprint image.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910104865.5A CN111522162B (en) | 2019-02-01 | 2019-02-01 | Display screen assembly and electronic equipment |
| CN202110742349.2A CN113435363B (en) | 2019-02-01 | 2019-02-01 | Electronic equipment |
| EP19913440.4A EP3910544A4 (en) | 2019-02-01 | 2019-06-30 | Electronic device |
| PCT/CN2019/094108 WO2020155550A1 (en) | 2019-02-01 | 2019-06-30 | Electronic device |
| US17/367,058 US11500493B2 (en) | 2019-02-01 | 2021-07-02 | Electronic device |
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| CN201910104865.5A CN111522162B (en) | 2019-02-01 | 2019-02-01 | Display screen assembly and electronic equipment |
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| CN113435363A (en) | 2021-09-24 |
| CN113435363B (en) | 2024-05-31 |
| CN111522162A (en) | 2020-08-11 |
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