CN110096128B - Display panel, method for fingerprint identification by using display panel and display device - Google Patents
Display panel, method for fingerprint identification by using display panel and display device Download PDFInfo
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- CN110096128B CN110096128B CN201910376434.4A CN201910376434A CN110096128B CN 110096128 B CN110096128 B CN 110096128B CN 201910376434 A CN201910376434 A CN 201910376434A CN 110096128 B CN110096128 B CN 110096128B
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- fingerprint identification
- fingerprint
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/325—Power saving in peripheral device
- G06F1/3265—Power saving in display device
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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
Abstract
The invention discloses a display panel, a method for fingerprint identification by using the display panel and a display device. The invention provides a display panel, comprising: the display substrate is provided with a fingerprint identification area; the fingerprint identification module is arranged on one side of the display substrate, and the orthographic projection of the fingerprint identification module on the display substrate is positioned in the fingerprint identification area; fingerprint suggestion module, fingerprint suggestion module sets up display substrate keeps away from one side of fingerprint identification module, fingerprint suggestion module includes controller and color-changing subassembly, the color-changing subassembly is in orthographic projection on the base plate covers at least fingerprint identification district, just color-changing subassembly accessible reflection or scattering ambient light are the reflection of light state by transparent state switching. Therefore, the fingerprint identification area can be prompted by the fingerprint prompting module by utilizing the ambient light, the energy consumption is reduced, and the user experience is improved.
Description
Technical Field
The invention relates to the field of display, in particular to a display panel, a method for fingerprint identification by using the display panel and a display device.
Background
With the development of science and technology, information security is also more and more emphasized, and electronic equipment such as a mobile phone and the like generally realizes the purpose of verifying the authority of a user through fingerprint identification, so that the information security is ensured. With the popularization of the full-screen, the under-screen fingerprint identification system is widely applied to fingerprint identification of electronic equipment due to the advantage that the under-screen fingerprint identification system does not occupy the display space. Currently, commonly used under-screen fingerprint identification systems include an optical fingerprint identification system, an ultrasonic fingerprint identification system, a capacitive fingerprint identification system, and the like. When utilizing fingerprint identification system to carry out fingerprint identification under the screen, the finger need not direct contact fingerprint identification module, consequently can not leave the fingerprint vestige on the fingerprint identification module, can reduce the influence to the unblock such as finger dirt, grease and sweat by a great extent, lets the fingerprint unblock more sanitary to can adapt to different service environment.
However, the present display panel, the method for fingerprint identification using the display panel, and the display device still need to be improved.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
the inventor finds that the display panel and the display device which utilize the under-screen fingerprint identification system to carry out fingerprint identification at present have the problem of high energy consumption. Because the fingerprint identification system under the screen does not have the entity button, therefore, the user needs to select the area of the fingerprint identification module according to experience when carrying out fingerprint identification, the operation is inconvenient, the user experience is poor, and the error touch (namely, the touch is carried out on other areas except the fingerprint identification area on the display panel) is easy to occur. At present, in order to facilitate the user to perform the fingerprint identification operation, when the user touches the display screen, a specific area (fingerprint identification area) of the screen is lighted up to prompt the user, and a fingerprint identification module is arranged below the specific area. Although the method can be convenient for the user to operate, the method is power-consuming, for example, the user accidentally touches the screen, the whole screen or the fingerprint identification area of the screen can be lightened, the screen and the fingerprint identification area are frequently lightened, the screen and the fingerprint identification area are in a lightening state after being lightened, the screen needs to be continuously supplied with power within a period of time, the energy consumption is high, and the endurance time of electronic equipment using the display panel, such as a mobile phone, is greatly reduced. Therefore, if a new display panel can be provided, the fingerprint identification area on the screen can be highlighted without continuously supplying power to the screen or the fingerprint identification area of the screen, which not only facilitates the operation of a user, but also reduces the energy consumption, and can greatly improve the service performance of electronic equipment and the like using the display panel, and the problems can be solved to a great extent.
In view of the above, in one aspect of the present invention, a display panel is provided. According to an embodiment of the present invention, the display panel includes: the display substrate is provided with a fingerprint identification area; the fingerprint identification module is arranged on one side of the display substrate, and the orthographic projection of the fingerprint identification module on the display substrate is positioned in the fingerprint identification area; fingerprint suggestion module, fingerprint suggestion module sets up display substrate keeps away from one side of fingerprint identification module, fingerprint suggestion module includes controller and color-changing component, the color-changing component is in orthographic projection on the display substrate covers at least fingerprint identification district, just color-changing component accessible reflection or scattering ambient light are the reflection of light state by transparent state switching. Therefore, the fingerprint identification area can be prompted by the fingerprint prompting module by utilizing the ambient light, the energy consumption is reduced, and the user experience is improved.
According to an embodiment of the present invention, the display panel further includes: the touch substrate is arranged on one side, far away from the display substrate, of the fingerprint prompt module, the color-changing assembly comprises an electrochromic device, the controller is electrically connected with the touch substrate, and the controller is configured to enable the electrochromic device to be switched from a transparent state to a colored state when the touch substrate receives a touch signal. Therefore, after the electrochromic device is switched to the coloring state, ambient light can be reflected, the fingerprint identification area can be highlighted, and the electrochromic device can keep a reflecting state without supplying power to the electrochromic device after being switched to the coloring state, so that the energy consumption is reduced, and the use performance of the display panel is improved.
According to an embodiment of the present invention, the display panel further includes: the touch substrate is arranged on one side, far away from the display substrate, of the fingerprint prompt module, the color-changing assembly comprises a scattering layer, the controller is electrically connected with the touch substrate, the controller is configured to enable the scattering layer to be switched from the transparent state to the scattering state when the touch substrate receives the touch signal, and the scattering layer comprises a polymer network liquid crystal material. Therefore, after the scattering layer is switched to the scattering state, the ambient light can be scattered, the fingerprint identification area can be highlighted, the power supply for the scattering layer is not required to be continuously supplied to keep the highlighted state of the fingerprint identification area, the energy consumption is reduced, and the use performance of the display panel is improved.
According to an embodiment of the present invention, the display panel further includes: touch-control base plate, the touch-control base plate sets up fingerprint prompt module is kept away from one side of display substrate, the subassembly that discolours includes two transparent substrates that relative setting, presss from both sides and establishes liquid crystal molecule and non-circular polaroid between the transparent substrate, non-circular polaroid sets up one of them transparent substrate keeps away from one side of liquid crystal molecule, and is close to the touch-control base plate sets up, non-circular polaroid with form the circular polaroid after the liquid crystal molecule is folded, the controller with the touch-control base plate electricity is connected, just the controller is configured to be can the touch-control base plate receives during the touch-control signal, the order non-circular polaroid with liquid crystal molecule reflection of ambient light, by transparent state switches into reflection of light state. Therefore, the controller can enable liquid crystal molecules in a corresponding area of the fingerprint identification area to deflect, the deflected liquid crystal molecules and the non-circular polaroid above the deflected liquid crystal molecules are superposed to reflect ambient light, the fingerprint identification area can be highlighted, the highlighted state of the fingerprint identification area can be kept without continuously supplying power to the color-changing assembly, energy consumption is reduced, and the use performance of the display panel is improved.
In another aspect of the present invention, the present invention provides a method for fingerprint recognition using the display panel as described above. According to an embodiment of the present invention, the display panel includes a display substrate having a fingerprint identification area, a fingerprint identification module and a fingerprint prompt module, the fingerprint identification module and the fingerprint prompt module are disposed on one side of the display substrate, an orthographic projection of the fingerprint identification module on the display substrate is located in the fingerprint identification area, the fingerprint prompt module is disposed on one side of the display substrate away from the fingerprint identification module, the fingerprint prompt module includes a controller and a color change component, the orthographic projection of the color change component on the display substrate at least covers the fingerprint identification area, and the method includes: when the controller receives the lightening signal, the color-changing assembly is controlled to be converted into a reflecting state from a transparent state through reflecting or scattering ambient light. Therefore, after the color-changing assembly receives the lighting signal, the fingerprint identification area can be conveniently highlighted by utilizing the ambient light, the response is sensitive, the energy consumption is less, and the service performance of the display panel is improved.
According to an embodiment of the present invention, the color-changing assembly includes an electrochromic device, the electrochromic device includes a first substrate and a second substrate which are disposed opposite to each other, and a first transparent conductive layer and a second transparent conductive layer which are disposed between the first substrate and the second substrate, an electrochromic layer is disposed between the first transparent conductive layer and the second transparent conductive layer, the controller is connected to the first transparent conductive layer and the second transparent conductive layer, the display panel further includes a touch substrate, the touch substrate is electrically connected to the controller, and the touch substrate sends the lighting signal to the controller when detecting a touch signal. Therefore, after the controller receives the lighting signal, the controller can control the voltage applied to the first transparent conducting layer and the second transparent conducting layer, the electrochromic layer is switched from a transparent state to a colored state, the electrochromic device in the colored state can reflect ambient light, the fingerprint identification area is highlighted, and energy consumption is reduced.
According to the embodiment of the invention, the color-changing assembly comprises a scattering layer, the display panel further comprises a touch substrate, the touch substrate is electrically connected with the controller, and the lighting signal is sent to the controller when the touch substrate detects a touch signal. Therefore, after the controller receives the lighting signal, the scattering layer can be controlled to be switched from the transparent state to the scattering state, the scattering layer in the scattering state can scatter the ambient light, the fingerprint identification area is highlighted, energy consumption is reduced, and the use performance of the display panel is improved.
According to an embodiment of the present invention, the color changing assembly includes two transparent substrates disposed opposite to each other, a liquid crystal molecule and a non-circular polarizer interposed between the transparent substrates, the non-circular polarizer is disposed on one side of one of the transparent substrates away from the liquid crystal molecule and disposed close to the touch substrate, the non-circular polarizer and the liquid crystal molecule are stacked to form a circular polarizer, the controller is electrically connected to the transparent substrates, the display panel further includes a touch substrate, the touch substrate is electrically connected to the controller, and the touch substrate sends the lighting signal to the controller when detecting a touch signal. Therefore, after the controller receives the lighting signal, the liquid crystal molecules in the corresponding area of the fingerprint identification area can deflect, the deflected liquid crystal molecules and the non-circular partial sheet above the deflected liquid crystal molecules are superposed to reflect ambient light, the fingerprint identification area can be highlighted, energy consumption is reduced, and the use performance of the display panel is improved.
According to an embodiment of the present invention, after the orthographic projection of the color-changing element on the display substrate covers the fingerprint identification area and at least a part of the area except the fingerprint identification area, and the touch substrate detects a touch signal and sends the lighting signal to the controller, the method further includes: the liquid crystal molecules deflect, and the light reflected by the noncircular polarizer and the liquid crystal molecules in the area corresponding to the fingerprint identification area and the light reflected by the noncircular polarizer and the liquid crystal molecules in the area corresponding to the noncircular identification area form difference. Therefore, the fingerprint identification area can be highlighted by utilizing the ambient light, the energy consumption is reduced, and the service performance of the display panel is improved.
In yet another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, the display device includes: the shell comprises a back plate and a side frame surrounding the back plate, and the back plate and the side frame define an accommodating space; and the display panel is positioned in the accommodating space, and the light-emitting side of the display panel deviates from one side of the backboard. Therefore, the display device has all the features and advantages of the display panel described above, and will not be described herein again. Generally, the display device has good user experience, low energy consumption and good use performance.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a display panel according to another embodiment of the present invention;
FIG. 4 shows a schematic structural diagram of an electrochromic device according to one embodiment of the invention;
FIG. 5 is a schematic cross-sectional view of a display panel according to another embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a display panel according to another embodiment of the present invention;
FIG. 7 is a flow chart of a method for fingerprint recognition using a display panel according to the present invention; and
fig. 8 is a flowchart illustrating a method of fingerprint recognition using a display panel according to another embodiment of the present invention.
Description of reference numerals:
100: a display substrate; 110: a fingerprint identification area; 200: a fingerprint identification module; 300: a fingerprint prompt module; 310: a color changing assembly; 311: a first substrate; 312: a first transparent conductive layer; 313: an electrochromic layer; 314: a second transparent conductive layer; 315: a second substrate; 10: a transparent substrate; 20: liquid crystal molecules; 30: a non-circular polarizer; 320: a controller; 1000: a display panel.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In one aspect of the present invention, a display panel is provided. According to an embodiment of the present invention, referring to fig. 1 and fig. 2 (where fig. 1 is a cross-sectional view of an area M along a direction AA' in fig. 2), a display panel 1000 includes a display substrate 100, a fingerprint identification module 200, and a fingerprint indication module 300, where the display substrate 100 has a fingerprint identification area 110, the fingerprint identification module 200 is disposed on one side of the display substrate 100, an orthogonal projection of the fingerprint identification module 200 on the display substrate 100 is located in the fingerprint identification area 100, and the fingerprint indication module 300 is disposed on one side of the display substrate 100 away from the fingerprint identification module 200. Specifically, the fingerprint prompting module 300 includes a controller 320 and a color change element 310, an orthographic projection of the color change element 310 on the display substrate 100 at least covers the fingerprint identification area 110, and the color change element 310 can be switched from a transparent state to a reflective state by reflecting or scattering the ambient light (as shown by the dashed arrow in fig. 1, the fingerprint prompting module 300 can reflect or scatter the ambient light). Therefore, the fingerprint prompting module 300 can highlight the fingerprint identification area by utilizing the ambient light, so that the energy consumption is reduced, and the user experience is improved.
For ease of understanding, the following describes a principle by which the display panel according to the embodiment of the present invention can achieve the above advantageous effects:
as described above, in order to facilitate a user to perform a fingerprint recognition operation, a screen or a specific area of the screen (fingerprint recognition area) is usually lighted up to prompt the user when the user touches the display screen. Although the method can be convenient for the user to operate, the method is power-consuming, for example, the user accidentally touches the screen, the whole screen or the fingerprint identification area of the screen can be lightened, the screen and the fingerprint identification area are frequently lightened, the screen and the fingerprint identification area are in a lightening state after being lightened, the screen needs to be continuously supplied with power within a period of time, the energy consumption is high, and the endurance time of electronic equipment using the display panel, such as a mobile phone, is greatly reduced. According to the display panel provided by the embodiment of the invention, the fingerprint prompting module is designed in the display substrate, and the fingerprint prompting module can highlight the fingerprint identification area by utilizing ambient light. Specifically, when fingerprint identification is needed, the controller in the fingerprint prompt module can control the color-changing assembly to change the structure or performance of the color-changing assembly, the color-changing assembly can be switched into a reflective state from a transparent state, the color-changing assembly in the reflective state can reflect or scatter ambient light, and then the ambient light can be utilized to highlight the fingerprint identification area, so that energy consumption is reduced. That is to say, in the display panel according to the embodiment of the present invention, when performing fingerprint identification, only a small amount of electricity needs to be added to switch the color changing assembly from the transparent state to the reflective state, and in the subsequent process, the color changing assembly can use ambient light to maintain the highlighting of the fingerprint identification area, and does not need to light the entire screen and continuously supply power to the screen after lighting the screen to maintain the highlighting of the fingerprint identification area, and further, the energy loss caused by continuously lighting the screen due to unintentional touching of the screen can be avoided. And, fingerprint prompt module's illumination does not also rely on the electronic equipment power supply, relies on the reflection ambient light can realize the illumination. Therefore, the display panel has less energy consumption when fingerprint identification is carried out, is convenient to operate, and improves the service performance of the display panel.
According to an embodiment of the present invention, referring to fig. 3, the display panel 1000 further includes a touch substrate 400, the touch substrate 400 is disposed on a side of the fingerprint prompting module 300 away from the display substrate 100, and the touch substrate 400 may be electrically connected to the controller 320. Therefore, when the user touches the touch substrate 400, and after the touch substrate detects the touch signal, the touch substrate 400 may send an electrical signal (e.g., a lighting signal) to the controller 320, so that the controller 320 controls the color changing element 310 to switch from the transparent state to the reflective state, and the color changing element reflects or scatters the ambient light, thereby continuously lighting (i.e., highlighting) the fingerprint identification area.
According to an embodiment of the present invention, a specific type of the display substrate 100 is not particularly limited, and may be, for example, a liquid crystal display substrate, an organic light emitting display substrate, or the like. According to the embodiment of the present invention, the specific type of the fingerprint identification module 200 is not particularly limited, and may be, for example, an optical fingerprint prompting module, an ultrasonic fingerprint prompting module, a capacitive fingerprint prompting module, or the like.
According to the embodiment of the present invention, the specific type of the fingerprint prompting module 300 is not particularly limited, and the controller 310 may be a control chip, a transparent electrode, or the like, as long as it can control the state of the color-changing element 320 to change, and further, as long as it can receive a lighting signal from the touch substrate 400, and control the color-changing element 320 to switch from the transparent state to the reflective state. Specifically, the specific type of the color-changing member 320 is not particularly limited as long as it can switch between a transparent state and a reflective state.
According to some embodiments of the present invention, referring to fig. 3 and fig. 4, the color-changing element 310 may be an electrochromic device, the controller 320 is electrically connected to the touch substrate 400, and the controller 320 may switch the electrochromic device from a transparent state to a colored state when the touch substrate 400 receives a touch signal. Therefore, after the electrochromic device is switched to the colored state, ambient light can be reflected, so that the fingerprint identification area 110 can be highlighted, and after the electrochromic device is switched to the colored state, the reflective state can be maintained without supplying power to the electrochromic device, so that the energy consumption is reduced, and the use performance of the display panel 1000 is improved.
Specifically, referring to fig. 4, when the color changing assembly 310 is an electrochromic device, the color changing assembly may include a first substrate 311 and a second substrate 315 that are oppositely disposed, and a first transparent conductive layer 312 and a second transparent conductive layer 314 that are disposed between the first substrate 311 and the second substrate 315, wherein an electrochromic layer 315 is disposed between the first transparent conductive layer 312 and the second transparent conductive layer 314, and the controller 320 may be connected to the first transparent conductive layer 312 and the second transparent conductive layer 314. Therefore, after receiving the lighting signal, the controller 320 may control the voltages applied to the first transparent conductive layer 312 and the second transparent conductive layer 314, so as to switch the electrochromic layer 313 from the transparent state to the colored state, and the electrochromic device in the colored state may reflect the ambient light, so as to highlight the fingerprint identification area 110, and reduce power consumption.
According to an embodiment of the present invention, when the color changing assembly 310 is an electrochromic device, an orthographic projection of the color changing assembly 310 on the substrate 100 may cover the entire substrate 100, and at this time, the first transparent conductive layer 312 and the second transparent conductive layer 314 may both be partitioned electrodes, that is, the first transparent conductive layer 312 and the second transparent conductive layer 314 may independently control the color of the electrochromic layer 300 in the area corresponding to the fingerprint identification area 110 to change from a transparent state to a colored state, so as to highlight the fingerprint identification area 110. Therefore, when the color-changing assembly 310 is only arranged in the area corresponding to the fingerprint identification area 110, when the display panel is in a transparent state, the light transmittance of the area corresponding to the fingerprint identification area 110 is relatively poor (lower than that of the area without the color-changing assembly 310) due to the arrangement of the color-changing assembly 310 (including a multilayer structure), so that the consistency of the display panel in the transparent state is influenced, and the appearance effect of the display panel is influenced.
According to another embodiment of the present invention, referring to fig. 5, the color changing element 310 may further include a scattering layer, the controller 320 is electrically connected to the touch substrate 400, and the controller 320 may energize the scattering layer when the touch substrate 400 receives a touch signal, so as to deflect the liquid crystal Material in the scattering layer, and switch the liquid crystal Material from a transparent state to a scattering state, where the scattering layer may include a Polymer Network liquid crystal Material (PNM liquid crystal Material), and after the scattering layer is switched to the scattering state, the scattering layer may scatter ambient light, so as to highlight the fingerprint identification region 110, and the scattering layer does not need to be continuously energized to maintain the highlighted state of the fingerprint identification region 110, thereby reducing energy consumption and improving the usability of the display panel 1000.
According to still other embodiments of the present invention, referring to fig. 6, the color changing assembly 310 may include two transparent substrates 10A and 10B disposed opposite to each other, and liquid crystal molecules 20 and a non-circular polarizer 30 sandwiched between the transparent substrates 10A and 10B, the transparent substrates 10A and 10B may be transparent electrodes, such as Indium Tin Oxide (ITO), and the non-circular polarizer 30 is disposed on one side of the transparent substrate 10 away from the liquid crystal molecules 20 and close to the touch substrate 400 (i.e., the non-circular polarizer 30 is disposed on one side of the transparent substrate 10A away from the liquid crystal molecules 20). The non-circular polarizer 30 and the liquid crystal molecular layer 20 are laminated to form a circular polarizer. Specifically, the retardation of the liquid crystal molecules 20 may be 1/4 λ, that is, the retardation of the liquid crystal molecules 20 may be 550nm, and the included angle between the slow axis of the liquid crystal molecules 20 and the non-circular polarizer 30 may be 45 °, so that the liquid crystal molecules 20 and the non-circular polarizer 30 may form a circular polarizer after being stacked.
Specifically, the orthographic projection of the color changing component 310 on the substrate 110 may cover the fingerprint identification region 110 and at least a portion of the area other than the fingerprint identification region 110 (e.g., referring to fig. 6 showing that the orthographic projection of the color changing component 310 on the substrate 110 covers the entire display substrate 100). Specifically, the transparent substrates 10A and 10B may be divisional electrodes, that is, the transparent substrates 10A and 10B may independently control the liquid crystal molecules of the fingerprint identification area corresponding region and the liquid crystal molecules of the non-fingerprint identification area corresponding region to be deflected. Specifically, when fingerprint identification is required, the touch substrate 400 receives a touch signal and sends a lighting signal to the controller 320, the controller 320 receives the lighting signal and controls the transparent substrates 10A and 10B to deflect only the liquid crystal molecules in the area corresponding to the fingerprint identification area 110, so that the liquid crystal molecules 20 in the area corresponding to the fingerprint identification area 110 can be deflected, the deflected liquid crystal molecules 20 and the non-circular polarizer 30 above the deflected liquid crystal molecules can be superposed to reflect ambient light, and the fingerprint identification area 110 can be highlighted. Specifically, after receiving the lighting signal, the controller 320 may also control the transparent substrates 10A and 10B to make the liquid crystal molecules in the area corresponding to the fingerprint identification area 110 and the liquid crystal molecules in the area corresponding to the non-fingerprint identification area have different deflection angles, so that the light reflected by the liquid crystal molecules 20 in the area corresponding to the fingerprint identification area 110 and the non-circular polarizer 30 above the liquid crystal molecules may be different from the light reflected by the liquid crystal molecules 20 in the area corresponding to the non-fingerprint identification area and the non-circular polarizer 30 above the non-fingerprint identification area, and the fingerprint identification area 110 may also be highlighted. Moreover, when the display panel is in a transparent state (i.e., the fingerprint identification area 110 is not required to be highlighted), the light transmittances of all the parts of the display panel are relatively consistent, and the appearance consistency is relatively good. Note that, the above-mentioned "liquid crystal molecules 20 in the area corresponding to the fingerprint identification area 110" means: the orthographic projection on the display substrate 100 is the liquid crystal molecules 20 located in the fingerprint identification area 100.
To sum up, this display panel makes fingerprint identification district prominent display through setting up fingerprint prompt module, usable ambient light, has reduced the energy consumption, has promoted user experience.
In another aspect of the present invention, the present invention provides a method for fingerprint recognition using the display panel as described above. According to the embodiment of the present invention, the display panel mentioned in the method may have all the features and advantages of the display panel described above, and will not be described herein again. Referring to fig. 7, the method includes, according to an embodiment of the present invention:
s100: the controller receives the lighting signal
In this step, the controller receives a lighting signal. According to the embodiment of the invention, as mentioned above, the display panel needs to make the fingerprint identification area highlighted before fingerprint identification is performed, so as to facilitate the user operation. Therefore, before fingerprint recognition is performed, the controller needs to receive a lighting signal (i.e., a signal for highlighting the fingerprint recognition area). According to an embodiment of the invention, referring to fig. 8, before this step, the method further comprises:
s300: the touch substrate detects a touch signal
In this step, the touch substrate detects a touch signal. According to the embodiment of the present invention, as described above, before the fingerprint identification is performed on the display panel, a user touches the screen with a finger or a stylus, and after the touch substrate detects the touch signal, the subsequent steps may be performed to start the fingerprint prompting module, so that the fingerprint identification area is highlighted, thereby facilitating the user operation.
S400: sends out a lighting signal to the controller
In this step, after the touch substrate detects the touch signal in the previous step, a lighting signal is sent to the controller. According to the embodiment of the invention, the touch panel is electrically connected with the controller of the fingerprint prompt module, so that the touch substrate can send a lighting signal to the controller after detecting the touch signal.
S200: controlling the color-changing component to reflect or scatter the ambient light, and changing the color-changing component from a transparent state to a reflective state
In this step, the touch substrate sends out the signal of lighting to the controller in the preceding step to after the controller received the signal of lighting, the controller can control the color-changing subassembly and become reflection of light state by transparent state, and the color-changing subassembly that is in reflection of light state can reflect or scatter ambient light, and then can utilize ambient light to make fingerprint identification district propose showing, convenience of customers operates, and saved the energy consumption.
According to some embodiments of the invention, when the color changing component comprises an electrochromic device: the touch control substrate receives the touch control signal and sends a lighting signal to the controller, after the controller receives the lighting signal, the controller can control the voltage applied to the first transparent conducting layer and the second transparent conducting layer of the electrochromic device, so that the electrochromic layer is switched from a transparent state to a colored state, the electrochromic device in the colored state can reflect ambient light, the fingerprint identification area is highlighted, and energy consumption is reduced.
According to further embodiments of the present invention, when the color changing component comprises a scattering layer: the touch control substrate receives the touch control signal and sends a lighting signal to the controller, and after the controller receives the lighting signal, the scattering layer can be controlled to be switched into a scattering state from a transparent state, and the scattering layer in the scattering state can scatter ambient light, so that the fingerprint identification area is highlighted, energy consumption is reduced, and the use performance of the display panel is improved. Specifically, the scattering layer may include a PNM liquid crystal material, and the like, and the controller may energize the PNM liquid crystal material to deflect the liquid crystal molecules, and the deflected liquid crystal material may scatter ambient light to highlight the fingerprint identification region.
According to still other embodiments of the present invention, when the color changing assembly includes two transparent substrates disposed opposite to each other, and the liquid crystal molecules and the non-circular polarizer sandwiched between the transparent substrates, the touch substrate receives the touch signal and sends a lighting signal to the controller, and after the controller receives the lighting signal, the liquid crystal molecules in the area corresponding to the fingerprint identification area may be deflected, and the deflected liquid crystal molecules and the non-circular polarizer above the deflected liquid crystal molecules may be overlapped to reflect the ambient light, so that the fingerprint identification area may be highlighted, and the energy consumption is reduced, thereby improving the usability of the display panel. Specifically, when the orthographic projection of the non-circular polarizer and the liquid crystal molecules on the display substrate covers the fingerprint identification area and at least one part of area except the fingerprint identification area, the transparent substrates 10A and 10B can be partitioned electrodes, after the touch substrates detect the touch signals and send lighting signals to the controller, the controller can control the transparent substrates 10A and 10B to enable the liquid crystal molecules in the area corresponding to the fingerprint identification area to deflect at different angles and the liquid crystal molecules in the area corresponding to the non-fingerprint identification area to deflect at different angles, and therefore the light reflected by the non-circular polarizer and the liquid crystal molecules in the area corresponding to the fingerprint identification area and the light reflected by the non-circular polarizer and the liquid crystal molecules in the area corresponding to the non-fingerprint identification area form differences. Therefore, the fingerprint identification area can be highlighted by utilizing the ambient light, the energy consumption is reduced, and the service performance of the display panel is improved.
In conclusion, the method can enable the color-changing component to conveniently highlight the fingerprint identification area by utilizing the ambient light after receiving the lighting signal, has sensitive response and less energy consumption, and improves the service performance of the display panel.
In yet another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, the display device includes: a housing; and a display panel as described above. Therefore, the display device has all the features and advantages of the display panel described above, and will not be described herein again. Generally, the display device has good user experience, low energy consumption and good use performance.
In the description of the present specification, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus, they should not be construed as limiting the present invention.
In the description herein, references to the description of "one embodiment," "another embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (3)
1. A display panel, comprising:
the display substrate is provided with a fingerprint identification area;
the fingerprint identification module is arranged on one side of the display substrate, and the orthographic projection of the fingerprint identification module on the display substrate is positioned in the fingerprint identification area;
the fingerprint prompting module is arranged on one side, far away from the fingerprint identification module, of the display substrate and comprises a controller and a color changing assembly, the orthographic projection of the color changing assembly on the display substrate at least covers the fingerprint identification area, and the color changing assembly can be switched from a transparent state to a reflective state by reflecting ambient light;
the touch substrate is arranged on one side, away from the display substrate, of the fingerprint prompt module;
wherein, the color-changing assembly comprises two transparent substrates which are oppositely arranged, liquid crystal molecules and a non-circular polaroid which are clamped between the transparent substrates, the non-circular polaroid is arranged at one side of one of the transparent substrates which is far away from the liquid crystal molecules and is close to the touch substrate, the non-circular polaroid and the liquid crystal molecules are overlapped to form a circular polaroid, the controller is electrically connected with the touch substrate, the orthographic projection of the color-changing assembly on the display substrate covers the fingerprint identification area and at least one part of area except the fingerprint identification area, the transparent substrate is a subarea electrode, and the controller is configured to deflect the liquid crystal molecules when the touch substrate receives a touch signal, so that the non-circular polaroid and the liquid crystal molecules corresponding to the fingerprint identification area reflect ambient light, the transparent state is switched to the reflecting state, and the light rays reflected by the noncircular polarizer and the liquid crystal molecules in the area corresponding to the fingerprint identification area and the light rays reflected by the noncircular polarizer and the liquid crystal molecules in the area corresponding to the noncircular fingerprint identification area form differences.
2. A method for fingerprint identification by using the display panel of claim 1, wherein the display panel comprises a display substrate having a fingerprint identification area, a fingerprint identification module and a fingerprint prompting module, the fingerprint identification module and the fingerprint prompting module are disposed on one side of the display substrate, an orthographic projection of the fingerprint identification module on the display substrate is located in the fingerprint identification area, the fingerprint prompting module is disposed on one side of the display substrate away from the fingerprint identification module, the fingerprint prompting module comprises a controller and a color change component, the orthographic projection of the color change component on the display substrate at least covers the fingerprint identification area, and the method comprises:
when the controller receives the lightening signal, the color-changing assembly is controlled to be converted from a transparent state into a reflective state by reflecting ambient light;
the display panel further comprises a touch substrate, the touch substrate is electrically connected with the controller, and the lighting signal is sent to the controller when the touch substrate detects a touch signal;
the color-changing assembly comprises two transparent substrates, liquid crystal molecules and a non-circular polarizer, wherein the two transparent substrates are arranged oppositely, the liquid crystal molecules and the non-circular polarizer are clamped between the two transparent substrates, the non-circular polarizer is arranged on one side, away from the liquid crystal molecules, of one transparent substrate and close to the touch substrate, the non-circular polarizer and the liquid crystal molecules form a circular polarizer after being overlapped, the controller is electrically connected with the transparent substrates, the color-changing assembly is arranged on the display substrate in a orthographic projection mode and covers the fingerprint identification area and at least one part of area except the fingerprint identification area, and the transparent substrates are partitioned electrodes.
3. A display device, comprising:
the shell comprises a back plate and a side frame surrounding the back plate, and the back plate and the side frame define an accommodating space; and
the display panel of claim 1, wherein the display panel is located in the accommodating space, and a light emitting side of the display panel is disposed away from one side of the back plate.
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| CN201910376434.4A CN110096128B (en) | 2019-05-07 | 2019-05-07 | Display panel, method for fingerprint identification by using display panel and display device |
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| CN110633695B (en) * | 2019-09-29 | 2022-11-18 | 京东方科技集团股份有限公司 | Line identification module and display device |
| CN112652648B (en) * | 2020-12-18 | 2023-06-27 | 合肥维信诺科技有限公司 | Display panel, control method thereof and display device |
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