CN110441946B - Display panel, driving method thereof and display device - Google Patents
Display panel, driving method thereof and display device Download PDFInfo
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- CN110441946B CN110441946B CN201910757990.6A CN201910757990A CN110441946B CN 110441946 B CN110441946 B CN 110441946B CN 201910757990 A CN201910757990 A CN 201910757990A CN 110441946 B CN110441946 B CN 110441946B
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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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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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
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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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
-
- 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
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Image Input (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides a display panel, a driving method thereof and a display device. This display panel includes backlight unit, display screen and touching thing identification element, the display screen sets up the light-emitting side at backlight unit, touching thing identification element sets up the one side that deviates from the display screen at backlight unit, backlight unit can provide the display ray for the display screen, touching thing identification element is used for discerning the touching thing that carries out the touch to the display screen, with the unblock display screen, be provided with supplementary imaging structure in backlight unit, supplementary imaging structure sets up in the orthographic projection area of touching thing identification element on backlight unit, be used for receiving the light and the backlight of touching thing reflection, and make the interference light of the two incide to touching thing identification element. When fingerprint identification under the realization screen of this touching thing identification element among display panel, even display screen thickness is great, can not influence the intensity of the detection light that touching thing identification element received yet to enable touching thing identification element and carry out clear discernment to the touching thing.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a display panel, a driving method thereof and a display device.
Background
Currently, the optical fingerprint unlocking function used under the screen of an OLED (Organic Light-Emitting display or Organic Light-Emitting semiconductor) mobile phone is increasingly common, but the OLED screen cannot be widely applied in a large scale due to the yield and yield. Due to the fact that the liquid Crystal thickness of an LCD (liquid Crystal display) screen is too large, the detection light intensity of fingerprint identification under the optical screen is weak, and clear imaging of fingerprints cannot be carried out.
At present, the mainstream mobile phones in the market are mainly LCD, so how to better apply the optical underscreen fingerprint identification technology to the LCD screen becomes a problem to be solved urgently at present.
Disclosure of Invention
The invention provides a display panel, a driving method thereof and a display device, aiming at the problems in the prior art. When fingerprint identification under the realization screen of this touching thing identification element among display panel, even display screen thickness is great, can not influence the intensity of the detection light that touching thing identification element received yet to enable touching thing identification element and carry out clear discernment to the touching thing.
The invention provides a display panel which comprises a backlight module, a display screen and a touch object identification element, wherein the display screen is arranged on the light-emitting side of the backlight module, the touch object identification element is arranged on the side, away from the display screen, of the backlight module, the backlight module can provide display light rays for the display screen, the touch object identification element is used for identifying a touch object touching the display screen so as to unlock the display screen, an auxiliary imaging structure is arranged in the backlight module, and the auxiliary imaging structure is arranged in an orthographic projection area of the touch object identification element on the backlight module and used for receiving light rays reflected by a touch object and backlight light rays and enabling interference light rays of the touch object and the backlight light rays to be incident to the touch object identification element.
Preferably, the backlight module comprises a reflecting sheet, a light guide plate and a light source, the light guide plate and the reflecting sheet are mutually overlapped and are sequentially distributed away from the display screen, and the light source is arranged at the outer side of the edge of the light guide plate;
a hollow area is formed in the reflector plate, and the auxiliary imaging structure is arranged in the hollow area.
Preferably, the touch screen further comprises a pressure sensing element, the pressure sensing element is arranged in the display screen, is located in an orthographic projection area of the auxiliary imaging structure on the display screen, and is used for sensing the touch pressure of the touch object on the display screen.
Preferably, the display device further comprises a control module, wherein the control module is electrically connected with the pressure sensing element, the driving circuit of the light source and the driving circuit of the display screen respectively, and is used for controlling the light source to irradiate the auxiliary imaging structure to have the highest brightness when the pressure sensing element senses the touch pressure of the touch object on the display screen, and controlling the orthographic projection area of the auxiliary imaging structure on the display screen to display the highest gray scale.
Preferably, a dot structure is formed on a side surface of the light guide plate close to the reflector plate, and the dot structure is used for making the brightness of light emitted from the light exit side of the light guide plate uniform;
The distribution density of the mesh point structures in the orthographic projection area of the auxiliary imaging structure is greater than that of the mesh point structures in other areas of the light guide plate.
Preferably, the auxiliary imaging structure comprises a polarizer.
Preferably, the display screen comprises a liquid crystal box, an upper polarizer and a lower polarizer, wherein the upper polarizer is arranged on the light emergent side of the liquid crystal box, and the lower polarizer is arranged on the light incident side of the liquid crystal box;
the polarization directions of the polarizer and the lower polarizer are the same.
The present invention further provides a driving method of the display panel, including: when a touch object carries out touch unlocking on the display screen, the auxiliary imaging structure receives light reflected by the touch object and backlight light irradiated on the touch object, so that the light reflected by the touch object and the backlight light are mutually interfered to generate interference light, the interference light can be incident to the touch object identification element, and the touch object identification element identifies the touch object according to the interference light.
Preferably, the display panel is the display panel of claim 4, and the driving method includes:
when the pressure sensing element senses the touch pressure of the touch object on the display screen, the control module controls the light source to irradiate the auxiliary imaging structure to have the highest brightness, and controls the orthographic projection area of the auxiliary imaging structure on the display screen to display the highest gray scale.
The invention also provides a display device comprising the display panel.
The invention has the beneficial effects that: according to the display panel provided by the invention, the auxiliary imaging structure is arranged in the backlight module, so that light reflected by the touch object is interfered with backlight light irradiated on the touch object to generate an interference image, the interference image is a hologram clearly recording finger fingerprint information, and because the interference image records phase information of the light and is slightly influenced by the intensity of the light, when the touch object identification element in the display panel realizes fingerprint identification under a screen, the intensity of detection light received by the touch object identification element cannot be influenced even if the thickness of the display screen is larger, so that the touch object identification element can clearly identify the touch object.
According to the display device provided by the invention, by adopting the display panel, the display device can realize the optical fingerprint identification under the screen under the condition that the thickness of the display screen is larger, and the fingerprint identification under the screen is not influenced by the intensity of the detection light, so that the definition and the sensitivity of touch unlocking of the fingerprint under the screen of the display device are improved.
Drawings
Fig. 1 is a schematic cross-sectional view of a display panel in embodiment 1 of the present invention;
FIG. 2 is a top view of the reflector plate and the auxiliary imaging structure disposed therein of FIG. 1.
Wherein the reference numerals are:
1. a backlight module; 11. a reflective sheet; 12. a light guide plate; 120. a dot structure; 13. A light source; 2. a display screen; 21. a liquid crystal cell; 22. an upper polarizer; 23. a lower polarizer; 3. a touch object recognition element; 4. an auxiliary imaging structure; 5. touching the object.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, a display panel, a driving method thereof, and a display device according to the present invention will be described in further detail with reference to the accompanying drawings and the detailed description.
Example 1:
the embodiment provides a display panel, as shown in fig. 1, including backlight unit 1, display screen 2 and touch object identification element 3, display screen 2 sets up the light-emitting side at backlight unit 1, touch object identification element 3 sets up the one side that deviates from display screen 2 at backlight unit 1, backlight unit 1 can provide display light for display screen 2, touch object identification element 3 is used for discerning touch object 5 that touches display screen 2, in order to unblock display screen 2, be provided with supplementary imaging structure 4 in backlight unit 1, supplementary imaging structure 4 sets up in touch object identification element 3 orthographic projection area on backlight unit 1, be used for receiving light and the backlight light that touch object 5 reflected, and make the interference light of the two incide to touch object identification element 3.
Wherein, the touch object 5 is a finger fingerprint. The display 2 is a liquid crystal display. The touch object recognition element 3 enables the display panel to realize the off-screen fingerprint recognition. This display panel is through setting up supplementary formation of image structure 4 in backlight unit 1, it interferes to enable the light that touching thing 5 reflects on it and the backlight light that shines on it, produce the interference image, this interference image is the clear hologram of having recorded finger fingerprint information, the fingerprint is different, the interference image is different, because the phase information of light that is of interference image record, it is very little to receive the influence of the intensity of light, so touching thing identification element 3 among this display panel is when realizing the fingerprint identification under the screen, even display screen 2 thickness is great, can not influence the intensity of the detection light that touching thing identification element 3 received yet, thereby can make touching thing identification element 3 carry out clear identification to touching thing 5.
In this embodiment, the backlight module 1 includes a reflective sheet 11, a light guide plate 12 and a light source 13, the light guide plate 12 and the reflective sheet 11 are stacked on each other and sequentially distributed away from the display screen 2, and the light source 13 is disposed outside an edge of the light guide plate 12; a hollow area is formed on the reflector plate 11, and the auxiliary imaging structure 4 is disposed in the hollow area (as shown in fig. 2). Light emitted from the light source 13 can be incident into the light guide plate 12 from the edge end face of the light guide plate 12, and the light guide plate 12 can uniformize the light emitted from the light source 13 to make the backlight uniform. The reflective sheet 11 can reflect the light emitted from the light guide plate 12 back to the light guide plate 12, so that most of the light can be emitted from the light emitting surface of the light guide plate 12 facing the display screen 2, and the utilization rate of the backlight light is improved. Because the touch object recognition element 3 is arranged on the side of the backlight module 1, which is far away from the display screen 2, the auxiliary imaging structure 4 is arranged in the reflector plate 11, on one hand, the light reflected by the touch object 5 and the light emitted by the light source 13 can be better received, on the other hand, the light reflected by the touch object 5 and the light emitted by the light source 13 can be interfered, and the interference light can be incident into the touch object recognition element 3, so that the touch object recognition element 3 can better recognize the touch object 5 through the received interference light.
Preferably, in this embodiment, the display panel further includes a pressure sensing element (not shown in the figure), and the pressure sensing element is disposed in the display screen 2 and located in an orthographic projection area of the auxiliary imaging structure 4 on the display screen 2, and is used for sensing a touch pressure of the touch object 5 on the display screen 2. The pressure sensing element may employ a pressure sensor.
The display panel further includes a control module (not shown in the figure), and the control module is electrically connected to the pressure sensing element, the driving circuit of the light source 13, and the driving circuit of the display screen 2, and is configured to control the brightness of light irradiated from the light source 13 to the auxiliary imaging structure 4 to be highest when the pressure sensing element senses the touch pressure of the touch object 5 on the display screen 2, and control the orthographic projection area of the auxiliary imaging structure 4 on the display screen 2 to display the highest gray scale (for example, L255, where the gray scale is 255), that is, the light transmittance when the display screen 2 displays is the highest. So set up, the light luminance that enables auxiliary imaging structure 4 and receive is the highest to make the luminance of the interference light that touching thing identification element 3 received the highest, and then improved the definition and the sensitivity of touching thing 5 discernment.
In this embodiment, by arranging the pressure sensing element and the control module, when the touch object 5 touches and unlocks the display screen 2, the area of the display screen 2 corresponding to the auxiliary imaging structure 4 can be immediately adjusted to the highest gray scale for displaying, and the light source 13 irradiating the area of the auxiliary imaging structure 4 with light correspondingly is adjusted to the highest brightness, so that the definition and the sensitivity of the touch object 5 identification are improved.
In this embodiment, a dot structure 120 is formed on a side surface of the light guide plate 12 close to the reflective sheet 11, and the dot structure 120 is used to make the brightness of the light emitted from the light emitting side of the light guide plate 12 uniform; the distribution density of the dot structures 120 in the front projection area of the auxiliary imaging structure 4 is greater than that in other areas of the light guide plate 12. Wherein, because supplementary imaging structure 4 is less than the reflection capability of reflector plate 11 to light to the reflection capability of light, in addition when fingerprint identification unblock, supplementary imaging structure 4 corresponds regional luminance in a poor light and is greater than the luminance in a poor light in other regions, so set up, on the one hand can compensate supplementary imaging structure 4 to the reflection of light and the reflection difference of reflector plate 11 to light, on the other hand can also compensate supplementary imaging structure 4 when fingerprint identification corresponds regional and the luminance difference in a poor light in other regions of light guide plate 12, thereby make whole display panel's luminance in a poor light tend to even, and then when guaranteeing normal demonstration, can also carry out sensitive touch unblock to display screen 2.
Preferably, in this embodiment, the auxiliary imaging structure 4 comprises a polarizer. In addition, the display screen 2 includes a liquid crystal box 21, an upper polarizer 22 and a lower polarizer 23, the upper polarizer 22 is disposed on the light-emitting side of the liquid crystal box 21, and the lower polarizer 23 is disposed on the light-emitting side of the liquid crystal box 21; the polarization direction of the polarizer is the same as that of the lower polarizer 23. Thus, the light reflected from the touch object 5 can only be incident on the polarizer through the lower polarizer 23 and can only interfere with the backlight light passing through the polarizer in the same polarization direction.
In addition, in the present embodiment, the touch object recognition element 3 may employ a semiconductor imaging device such as a Charge Coupled Device (CCD) or a complementary metal oxide semiconductor (CMOS sensor). According to the holographic principle, the interference components of the received image on the semiconductor imaging device can be subjected to holographic reduction (such as a Fourier transform method) through a holographic reduction algorithm built in the display panel, and other image components on the semiconductor imaging device cannot be reduced, so that the three-dimensional holographic image of the touch object 5 is obtained. The holographic image has higher precision than a common plane image, and the interference picture records the phase information of the light, so the interference picture is less influenced by the intensity of the light.
In this embodiment, the specific process of unlocking the display screen by the touch object of the display panel is as follows:
(1) the display panel backlight is used as a light source for unlocking a touch object (such as a fingerprint). By means of the partition control of the backlight light source, when a fingerprint unlocking function is performed (the pressure of a finger can be sensed by a pressure sensor arranged in a display panel or a pressure sensor integrated in a screen), the high-brightness backlight corresponding to the fingerprint unlocking area is turned on, the display screen corresponding to the fingerprint unlocking area displays an L255 gray scale, and the light transmittance of the display screen is the highest at the moment.
(2) Because the display screen light transmittance corresponding to the fingerprint unlocking area is highest and the backlight is turned on, light emitted by the backlight source is emitted in the form of linearly polarized light after passing through the lower polarizer, the liquid crystal box and the upper polarizer.
(3) At this time, the finger is above the display screen, so the finger can reflect the emergent linearly polarized light, and the linearly polarized light sequentially passes through the upper polarizer, the liquid crystal cell and the lower polarizer to be emitted in the form of linearly polarized light in the direction of the backlight, and enters the backlight module, and the light is marked as L1.
(4) The reflector plate of the backlight module is hollowed at the part corresponding to the fingerprint unlocking area, and a polarizer with the same polarization direction as that of L1 is placed at the hollowed part. In order to maintain the backlight uniformity after the hollowed-out treatment of the reflector plate, the distribution density of the dot structures is designed differently in the corresponding light guide plate area, and the brightness of different backlight light sources can be adjusted to maintain the backlight uniformity.
(5) Meanwhile, the light emitted from the backlight source is transmitted through the light guide plate, and a part of the light escapes from the lower part of the light guide plate, irradiates the polarizer at the hollowed part of the reflector, and exits along the corresponding polarization direction, and the light is marked as L2.
(6) Meanwhile, the L1 light passes through the films and polarizers of the backlight module and exits along the corresponding polarization direction. The polarization directions of the L1 light ray and the L2 light ray are the same.
(7) Since the polarization directions of the two beams of light of L1 and L2 are the same, an interference effect is generated. The interference image generated by L1 and L2 is imaged on a touch object recognition element (corresponding to an image receiving device) such as a CCD or CMOS, etc. disposed under the polarizer.
(8) Interference images generated by L1 and L2 under different fingerprints are different, so that the fingerprints can be identified by detecting the difference of the interference images, interference components of images received by the image receiving device can be subjected to holographic reduction (such as a Fourier transform method) by a display panel built-in holographic reduction algorithm according to a holographic principle, and other image components on the image receiving device cannot be reduced, so that a three-dimensional holographic image of the fingerprints is obtained. The holographic image has higher precision than a common plane image, and the interference picture records the phase information of the light, so the interference picture is less influenced by the intensity of the light.
Based on the above structure of the display panel, the present embodiment further provides a driving method of the display panel, including: when the touch object carries out touch unlocking on the display screen, the auxiliary imaging structure receives light reflected by the touch object and backlight light irradiated on the auxiliary imaging structure, the light reflected by the touch object and the backlight light are mutually interfered to generate interference light, the interference light can be incident to the touch object identification element, and the touch object identification element identifies the touch object according to the interference light.
In this embodiment, the driving method further includes when the pressure sensing element senses a touch pressure of a touch object on the display screen, controlling, by the control module, the light source to irradiate the auxiliary imaging structure with the highest brightness, and controlling the orthogonal projection area of the auxiliary imaging structure on the display screen to display the highest gray scale.
Beneficial effects of example 1: the display panel provided in embodiment 1, through set up the supplementary structure of forming an image in backlight unit, light that enables touch thing reflection to it interferes with the backlight light who shines on it, produces the interference image, this interference image is the hologram of clear record finger fingerprint information, because the phase information of light that interference image record, receive the influence of the intensity of light very little, so when touch thing identification element in this display panel realizes fingerprint identification under the screen, even display screen thickness is great, can not influence the intensity of the detection light that touch thing identification element received, thereby can make touch thing identification element carry out clear identification to the touch thing.
Example 2:
the present embodiment provides a display device including the display panel in embodiment 1.
Through adopting the display panel that provides in embodiment 1, make this display device under the great condition of display screen thickness, also can realize optical fingerprint identification under the screen, and can not receive the influence of detection light intensity when fingerprint identification under the screen, promoted definition and the sensitivity of fingerprint touch unblock under the display device screen.
The display device provided by the invention can be any product or component with a display function, such as an LCD panel, an LCD television, a display, a mobile phone, a navigator and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A display panel comprises a backlight module, a display screen and a touch object identification element, wherein the display screen is arranged on the light-emitting side of the backlight module, the touch object identification element is arranged on one side of the backlight module, which is far away from the display screen, the backlight module can provide display light rays for the display screen, and the touch object identification element is used for identifying a touch object touching the display screen so as to unlock the display screen;
The backlight module comprises a reflecting sheet, a light guide plate and a light source, the light guide plate and the reflecting sheet are mutually overlapped and are sequentially distributed away from the display screen, and the light source is arranged on the outer side of the edge of the light guide plate;
a hollow area is formed in the reflector plate, and the auxiliary imaging structure is arranged in the hollow area.
2. The display panel of claim 1, further comprising a pressure sensing element disposed in the display screen and located in an orthographic projection area of the auxiliary imaging structure on the display screen for sensing a touch pressure of the touch object on the display screen.
3. The display panel according to claim 2, further comprising a control module, wherein the control module is electrically connected to the pressure sensing element, the driving circuit of the light source, and the driving circuit of the display screen, respectively, and configured to control brightness of light irradiated from the light source onto the auxiliary imaging structure to be highest and control a front projection area of the auxiliary imaging structure on the display screen to display a highest gray scale when the pressure sensing element senses a touch pressure of the touch object on the display screen.
4. The display panel according to claim 3, wherein a dot structure is formed on a side of the light guide plate close to the reflective sheet, and the dot structure is used to make the brightness of the light emitted from the light exit side of the light guide plate uniform;
the distribution density of the mesh point structures in the orthographic projection area of the auxiliary imaging structure is greater than that of the mesh point structures in other areas of the light guide plate.
5. The display panel of any of claims 1-4 wherein the auxiliary imaging structure comprises a polarizer.
6. The display panel according to claim 5, wherein the display screen comprises a liquid crystal cell, an upper polarizer and a lower polarizer, the upper polarizer is disposed at a light exit side of the liquid crystal cell, and the lower polarizer is disposed at a light entrance side of the liquid crystal cell;
the polarization direction of the polarizer is the same as that of the lower polarizer.
7. A driving method of the display panel according to any one of claims 1 to 6, comprising: when a touch object carries out touch unlocking on the display screen, the auxiliary imaging structure receives light reflected by the touch object and backlight light irradiated on the touch object, so that the light reflected by the touch object and the backlight light are mutually interfered to generate interference light, the interference light can be incident to the touch object identification element, and the touch object identification element identifies the touch object according to the interference light.
8. The method for driving a display panel according to claim 7, wherein the display panel is the display panel according to claim 4, the method comprising:
when the pressure sensing element senses the touch pressure of the touch object on the display screen, the control module controls the light source to irradiate the auxiliary imaging structure to have the highest brightness, and controls the orthographic projection area of the auxiliary imaging structure on the display screen to display the highest gray scale.
9. A display device characterized by comprising the display panel according to any one of claims 1 to 6.
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| CN106022323A (en) * | 2016-07-26 | 2016-10-12 | 昆山龙腾光电有限公司 | Finger identification system, finger identification method and fingerprint identification device |
| CN108021860A (en) * | 2016-10-28 | 2018-05-11 | 三星电子株式会社 | Device for the noise inputs for reducing fingerprint sensor |
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