CN109614958B - Liquid crystal display device, line identification method and electronic equipment - Google Patents
Liquid crystal display device, line identification method and electronic equipment Download PDFInfo
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- CN109614958B CN109614958B CN201910008508.9A CN201910008508A CN109614958B CN 109614958 B CN109614958 B CN 109614958B CN 201910008508 A CN201910008508 A CN 201910008508A CN 109614958 B CN109614958 B CN 109614958B
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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
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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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
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Abstract
The invention discloses a liquid crystal display device, a grain identification method and electronic equipment.A grain identification region is arranged in a display region of the liquid crystal display device, an opening is arranged in a region corresponding to the grain identification region through a reflector plate in a backlight module, and a grain identification structure corresponding to the opening is arranged, so that light emitted by the backlight module passes through a liquid crystal display panel, is reflected by a main body with a grain, passes through the backlight module and enters the grain identification structure through the opening, is received by the grain identification structure, and further can realize the grain identification function of the liquid crystal display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a liquid crystal display device, a line identification method and electronic equipment.
Background
With the rapid development of technology, mobile products with biometric identification function gradually come into the lives of people. The fingerprint is a characteristic which is unique and unique to the human body and distinguishable from other people, and is composed of a series of valleys and ridges on the surface of the skin at the finger tip, the composition details of which usually include the branches of the ridges, the ends of the ridges, the arches, the tent-like arches, the left-handed, right-handed, spiral, or double-handed details, which determine the unique characteristics of the fingerprint and therefore have received much attention. At present, a Liquid Crystal Display (LCD) has a backlight module, and a reflector plate for reflecting light is disposed in the backlight module, and the material of the reflective layer is generally opaque, so that light reflected by a finger cannot pass through the backlight module, and the application of the optical fingerprint identification technology to the LCD is affected.
Disclosure of Invention
The embodiment of the invention provides a liquid crystal display device, a grain identification method and electronic equipment, which are used for enabling the liquid crystal display device to realize an optical fingerprint identification function.
An embodiment of the present invention provides a liquid crystal display device, including: the backlight module comprises a backlight module and a liquid crystal display panel positioned on the light-emitting side of the backlight module, wherein a display area of the liquid crystal display device is provided with a line identification area;
the reflecting sheet in the backlight module is provided with an opening in the area corresponding to the line identification area;
the liquid crystal display device further includes: the grain identification structure is arranged corresponding to the opening;
the grain identification structure is used for receiving light which is directly emitted by the backlight module and passes through the opening, and receiving light which passes through the opening after being reflected by the main body with the grains.
Optionally, in an embodiment of the present invention, the texture recognition structure includes: the imaging structure, the photosensitive structure and the shading layer are sequentially positioned on one side, away from the liquid crystal display panel, of the backlight module; wherein the photosensitive structure comprises a plurality of photosensitive elements; the orthographic projection of the light shielding layer on the liquid crystal display panel covers the orthographic projection of each photosensitive element on the liquid crystal display panel;
the imaging structure is used for collimating the light passing through the opening and then enabling the collimated light to be incident on the photosensitive element.
Optionally, in an embodiment of the present invention, the imaging structure and the photosensitive structure are located in the opening.
Optionally, in the embodiment of the present invention, the light shielding layer is located outside a plane where a side of the reflector plate facing away from the liquid crystal display panel is located.
Optionally, in an embodiment of the present invention, the light shielding layer is reused as a reflective layer.
Optionally, in an embodiment of the present invention, an orthographic projection of the light shielding layer on the liquid crystal display panel covers an orthographic projection of the opening on the liquid crystal display panel.
Optionally, in an embodiment of the present invention, the liquid crystal display device further includes: the line identification chip is used for acquiring a first electric signal generated by the line identification structure at an image display stage of a line identification period; in the line identification stage of the line identification period, acquiring a second electric signal generated by the line identification structure; taking the first electric signal as a noise signal, and performing denoising processing on the second electric signal to determine texture image information;
the first electric signal is generated by light which is received by the texture recognition structure and directly emitted by the backlight module and passes through the opening;
the second electrical signal is generated by the light which is received by the texture recognition structure and directly emitted by the backlight module and passes through the opening and the light which passes through the opening after being reflected by the main body.
Correspondingly, an embodiment of the present invention further provides a method for identifying a texture of a liquid crystal display device, including: a plurality of line identification periods; the line recognition cycle includes: an image display stage and a line identification stage;
in the image display stage, acquiring a first electric signal generated by the texture recognition structure;
in the line identification stage, acquiring a second electric signal generated by the line identification structure;
and taking the first electric signal as a noise signal, and carrying out denoising processing on the second electric signal to determine the line image information.
Optionally, in the embodiment of the present invention, in the image display stage, a first electrical signal generated by each of the photosensitive elements is acquired; the first electric signal is generated by light which is received by the photosensitive element and directly emitted by the backlight module and is collimated by the imaging element;
at the line identification stage of the line identification period, acquiring second electric signals generated by the photosensitive elements; the second electric signal is generated by the light which is received by the photosensitive element and directly emitted by the backlight module and passes through the imaging element for collimation, and the light which is reflected by the main body and passes through the imaging element for collimation;
and taking the first electric signal as a noise signal, and performing denoising processing on the second electric signal corresponding to each photosensitive element according to the first electric signal corresponding to each photosensitive element to determine texture image information.
Correspondingly, the embodiment of the invention also provides electronic equipment comprising the liquid crystal display device provided by the embodiment of the invention.
The invention has the following beneficial effects:
according to the liquid crystal display device, the texture recognition method and the electronic equipment provided by the embodiment of the invention, the texture recognition region is arranged in the display region of the liquid crystal display device, the reflecting sheet in the backlight module is provided with the opening in the region corresponding to the texture recognition region, and the texture recognition structure corresponding to the opening is arranged, so that light emitted by the backlight module passes through the liquid crystal display panel, is reflected by the main body with the texture, passes through the backlight module and enters the texture recognition structure through the opening, is received by the texture recognition structure, and further the liquid crystal display device can realize the texture recognition function.
Drawings
Fig. 1 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the invention;
fig. 2 is a second schematic structural diagram of a liquid crystal display device according to an embodiment of the invention;
fig. 3 is a flowchart of a texture recognition method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of a liquid crystal display device, a texture recognition method and an electronic device according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments may be combined with each other without conflict. It should be noted that the film thicknesses and shapes of the respective layers in the drawings are not to be interpreted as true proportions, but are merely intended to illustrate the present invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
An embodiment of the present invention provides a liquid crystal display device, as shown in fig. 1, including: a backlight module 100 and a liquid crystal display panel 200 positioned at the light-emitting side of the backlight module 100. A display area AA of the liquid crystal display device 200 has a grain recognition area BB; the reflection sheet 110 in the backlight module 100 has an opening CC in a region corresponding to the grain identification region BB. The liquid crystal display device may further include: a grain recognition structure 300 provided corresponding to the opening CC; the texture recognition structure 300 is configured to receive light directly emitted from the backlight module 100 and passing through the opening CC, and receive light L1 reflected by the main body 400 and passing through the opening CC.
According to the liquid crystal display device provided by the embodiment of the invention, the texture recognition region is arranged in the display region of the liquid crystal display device, the reflecting sheet in the backlight module is provided with the opening in the region corresponding to the texture recognition region, and the texture recognition structure corresponding to the opening is arranged, so that light emitted by the backlight module passes through the liquid crystal display panel, is reflected by the main body with the texture, passes through the backlight module and enters the texture recognition structure through the opening, is received by the texture recognition structure, and further the liquid crystal display device can realize the texture recognition function.
In specific implementation, in the embodiment of the invention, the area of the reflective sheet 110 corresponding to the opening CC may be cut to form a hole or a hollow area, so as to transmit light. In practical applications, the reflective sheet may include a reflective sheet substrate and a reflective layer on the reflective sheet substrate, such that the reflective layer is avoided in the region corresponding to the opening CC, so as to form the region corresponding to the opening CC as a transparent region for transmitting light.
In specific implementation, in the embodiment of the present invention, as shown in fig. 1, the orthographic projection of the texture recognition structure on the liquid crystal display panel 200 and the orthographic projection of the opening CC on the liquid crystal display panel 200 have an overlapping region. Further, the orthographic projection of the texture recognition structure on the liquid crystal display panel 200 can cover the orthographic projection of the opening CC on the liquid crystal display panel 200.
Since a fingerprint is an inherent and unique characteristic of the human body and is distinguishable from other persons, it is composed of a series of valleys and ridges on the skin surface of the finger tip, the composition details of which generally include the branches of the ridges, the ends of the ridges, the arches, the tent-like arches, the left-handed, right-handed, spiral, or double-handed details, which determine the unique characteristics of the fingerprint, and thus, in an embodiment of the present invention, the body can be configured as a finger. The following description will be made by taking the case where the main body is a finger as an example.
In the embodiment of the present invention, as shown in fig. 2, the backlight module 100 may further include: a light guide plate 120 positioned between the reflective sheet 110 and the liquid crystal display panel 200, a prism sheet 130 positioned between the light guide plate 120 and the liquid crystal display panel 200, and a light source 140 positioned at one side (the left side as viewed in fig. 2) of the light guide plate 120. Generally, the prism sheet 130 and the light guide plate 120 are transparent, so that when a finger touches the liquid crystal display panel 200, light incident into the texture recognition structure 300 through the opening CC not only has light reflected by the finger, but also has light directly emitted from the backlight module 100. Therefore, in order to avoid the interference of the backlight module 100 on the fingerprint identification of the finger, in the embodiment of the present invention, in the specific implementation, the liquid crystal display device may further include: and a grain identification chip. The line recognition chip can be used for acquiring a first electric signal generated by the line recognition structure at the image display stage of the line recognition period. In a grain identification stage of a grain identification period, acquiring a second electric signal generated by a grain identification structure; and the first electric signal is taken as a noise signal, and the second electric signal is subjected to denoising processing to determine the grain image information. The first electric signal is generated by light which is directly emitted by the backlight module and passes through the opening and is received by the texture recognition structure. The second electric signal is generated by the light which is received by the grain identification structure and directly emitted by the backlight module and passes through the opening and the light which passes through the opening after being reflected by the main body. Further, in order to improve the integration of the chip, in the specific implementation, the texture recognition chip may be further configured to drive the liquid crystal display panel to display an image in the image display stage and the texture recognition stage, respectively. This eliminates the concern that the display interferes with fingerprint recognition. In particular implementations, the texture recognition chip may be in the form of an embodiment that combines software and hardware aspects.
In the image display stage, the lcd device is used for displaying images, and the backlight module can emit light, so that the texture recognition structure 300 can receive the light directly emitted by the backlight module 100 and passing through the opening CC, and the texture recognition structure 300 can generate a first electrical signal according to the light directly emitted by the backlight module 100 and passing through the opening CC. By acquiring the first electrical signal, information related to the light directly emitted from the backlight module 100 and passing through the opening CC, that is, information of the noise signal, can be obtained. In the texture recognition stage, since the light of the backlight module 100 is reflected by the finger and then enters the texture recognition structure 300 through the opening, and the backlight module 100 also emits light at this time, the light received by the texture recognition structure 300 includes the light directly emitted by the backlight module 100 and passing through the opening CC and the light reflected by the finger and passing through the opening CC. The texture recognition structure 300 may generate a second electrical signal based on the two different paths of light. By acquiring the second electrical signal, information related to the light directly emitted from the backlight module 100 and passing through the opening CC and the light reflected by the finger and passing through the opening CC can be obtained. Therefore, the first electric signal is used as a noise signal, and the second electric signal is subjected to denoising processing, so that fingerprint grain image information of the finger can be obtained, and the fingerprint of the finger can be obtained.
In specific implementation, in the embodiment of the present invention, as shown in fig. 2, the texture recognition structure 300 may include: the imaging structure 310, the photosensitive structure 320 and the light shielding layer 330 are sequentially located on a side of the backlight module 100 away from the liquid crystal display panel 200. In particular implementations, the photosensitive structure 320 includes a plurality of photosensitive elements 321. The light sensing element 321 may receive light passing through the opening to generate an electrical signal according to the received light. Further, the photosensitive element may include: the photoelectric detector comprises a photodiode and a switch transistor electrically connected with the photodiode, wherein the switch transistor is used for conducting the grain identification chip and the photodiode under the control of a detection control signal so that the grain identification chip can detect electric signals generated by all photosensitive elements. Generally, a photodiode can generate a photocurrent when being illuminated, so that the current flowing through the photodiode changes in light emission. In an embodiment of the present invention, the electrical signal may be a current signal.
In particular implementations, in embodiments of the present invention, the imaging structure may be configured to collimate light passing through the opening for incidence on the photosensitive element. Further, the imaging structure may include a set of lenses so that light passing through the opening may be collimated for incidence on the photosensitive element.
In a specific implementation, in the embodiment of the present invention, in order to avoid the influence of the external ambient light on the photosensitive elements, the orthographic projection of the light shielding layer on the liquid crystal display panel may be covered on the orthographic projection of each photosensitive element on the liquid crystal display panel.
In a specific implementation, the opening CC is formed by cutting a hole in a region of the reflective sheet 110 corresponding to the opening CC or forming a hollow region, and in an embodiment of the present invention, as shown in fig. 1 and fig. 2, the imaging structure 310 and the photosensitive structure 320 are both located in the opening CC. For example, the photosensitive elements 321 in the imaging structure 310 and the photosensitive structure 320 are embedded into the opening CC.
In specific implementation, in the embodiment of the present invention, as shown in fig. 1 and fig. 2, the light shielding layer 320 may be located outside the plane S1 where the side of the reflective sheet 110 facing away from the liquid crystal display panel 200 is located. That is, the light-shielding layer 320 is not embedded in the opening CC but disposed outside the opening CC.
Further, the light shielding layer may be multiplexed as a reflective layer to reduce the thickness of the liquid crystal display device. In general, the light directly generated by the backlight module and passing through the opening CC may not be completely absorbed by the photosensitive element, and therefore, in order to reflect the rest of the light not absorbed by the photosensitive element, in the embodiment of the invention, as shown in fig. 1 and fig. 2, the front projection of the light shielding layer 330 on the liquid crystal display panel 200 may be made to cover the front projection of the opening CC on the liquid crystal display panel 200.
Based on the same inventive concept, an embodiment of the present invention further provides a method for identifying a texture of a liquid crystal display device, which may include: a plurality of line identification periods; the line recognition cycle may include: an image display stage and a line identification stage;
in the image display stage, acquiring a first electric signal generated by a texture recognition structure;
in the texture recognition stage, acquiring a second electric signal generated by the texture recognition structure;
and taking the first electric signal as a noise signal, and carrying out denoising processing on the second electric signal to determine the grain image information.
In one embodiment, the texture recognition period may be at least one frame display time. Specifically, the texture recognition period may be a frame display time, such that the first 1/2 frame display time is set as the image display phase, and the last 1/2 frame display time is set as the texture recognition phase. Or, the grain identification period may also be five frames of display time, so that one frame of display time of the five frames of display time may be set as the image display stage, and the other frame of display time may be set as the grain identification stage. Of course, different liquid crystal display devices have different requirements for the texture recognition period, and therefore, in practical application, the texture recognition period may be designed and determined according to the practical application environment, which is not limited herein.
The following describes the above-mentioned texture recognition method provided by the embodiment of the present invention with reference to the liquid crystal display device shown in fig. 2. In this case, the texture recognition period may be a frame display time. The image display stage corresponds to the display time of the front 1/2 frames, and the texture recognition stage corresponds to the display time of the rear 1/2 frames.
As shown in fig. 3, the method for identifying a texture provided in the embodiment of the present invention may include the following steps:
s301, in the image display stage, acquiring first electric signals generated by all photosensitive elements; the first electric signal is generated by light which is received by the photosensitive element and directly emitted by the backlight module and passes through the imaging element for collimation.
Specifically, in the image display stage, the liquid crystal display device is driven to perform a screen display operation. During the first 1/4 frame display time of the one-frame display time, the light transmitted on the light guide plate 120 is collimated by the imaging system and then incident on the photodiodes of the respective light sensing elements 321, so that the photodiodes generate photocurrent. And the switch transistors are controlled to be conducted through the detection control signal so as to provide the photocurrent generated by each photodiode to the texture detection chip, so that the texture detection chip can acquire a first current signal I1_ M (M is more than or equal to 1 and less than or equal to M, M is an integer, and M represents the total number of the photodiodes) generated by each photodiode. Then, in the second 1/4 frame display time of the one frame display time, the detection control signal controls each switching transistor to be turned off.
S302, in a line identification stage of a line identification period, acquiring second electric signals generated by all the photosensitive elements; the second electrical signal is generated by light which is received by the photosensitive element and directly emitted by the backlight module, passes through the imaging element for collimation, and light which is reflected by the main body and then passes through the imaging element for collimation.
Specifically, in the texture recognition stage, the liquid crystal display device is driven to perform image display work. In the third 1/4 frame display time of one frame display time, the light transmitted on the light guide plate 120 is collimated by the imaging system and then incident on the photodiodes of the light sensing elements 321, and the light emitted from the backlight module 100 through the liquid crystal display panel is reflected by the finger and then collimated by the imaging system and then also incident on the photodiodes of the light sensing elements 321, and the two different paths of light make the photodiodes generate photocurrent. And the switch transistors are controlled to be switched on by detecting the control signal so as to provide the photocurrent generated by each photodiode to the texture detection chip, so that the texture detection chip can acquire a second current signal I2_ m generated by each photodiode. Then, in the fourth 1/4 frame display time in one frame display time, the detection control signal controls each switching transistor to be turned off.
And S303, taking the first electric signal as a noise signal, and performing denoising processing on the second electric signal corresponding to each photosensitive element according to the first electric signal corresponding to each photosensitive element to determine texture image information.
Specifically, the first current signal I1_ m corresponding to each photodiode is converted into a first voltage signal V1_ m, and the second current signal I2_ m is converted into a second voltage signal V2_ m. For each photodiode, the first voltage signal V1_ m corresponding to the photodiode is used as a noise signal, and the second voltage signal V2_ m corresponding to the photodiode is subjected to denoising processing to obtain a voltage signal V2_ m-V1_ m with V1_ m removed. Therefore, the fingerprint image information of the finger fingerprint is determined according to the voltage signals V2_ m-V1_ m corresponding to each photodiode.
Based on the same inventive concept, the embodiment of the invention also provides electronic equipment comprising the liquid crystal display device provided by the embodiment of the invention. The implementation of the electronic device can refer to the above embodiments of the liquid crystal display device, and repeated descriptions are omitted.
In specific implementation, the electronic device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a digital photo frame, a navigator and the like. Other essential components of the electronic device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present invention.
According to the liquid crystal display device, the texture recognition method and the electronic equipment provided by the embodiment of the invention, the texture recognition region is arranged in the display region of the liquid crystal display device, the reflecting sheet in the backlight module is provided with the opening in the region corresponding to the texture recognition region, and the texture recognition structure corresponding to the opening is arranged, so that light emitted by the backlight module passes through the liquid crystal display panel, is reflected by the main body with the texture, passes through the backlight module and enters the texture recognition structure through the opening, is received by the texture recognition structure, and further the liquid crystal display device can realize the texture recognition function.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A liquid crystal display device comprising: the liquid crystal display device comprises a backlight module and a liquid crystal display panel positioned on the light-emitting side of the backlight module, and is characterized in that a display area of the liquid crystal display device is provided with a grain identification area;
the reflecting sheet in the backlight module is provided with an opening in the area corresponding to the line identification area;
the liquid crystal display device further includes: the grain identification structure is arranged corresponding to the opening;
the grain identification structure is used for receiving light which is directly emitted by the backlight module and passes through the opening, and receiving light which passes through the opening after being reflected by the main body with the grains;
the line identification structure includes: the imaging structure, the photosensitive structure and the shading layer are sequentially positioned on one side, away from the liquid crystal display panel, of the backlight module; wherein the photosensitive structure comprises a plurality of photosensitive elements; the orthographic projection of the light shielding layer on the liquid crystal display panel covers the orthographic projection of each photosensitive element on the liquid crystal display panel;
the imaging structure is used for collimating the light passing through the opening and then enabling the collimated light to be incident on the photosensitive element.
2. The liquid crystal display device of claim 1, wherein the imaging structure and the photosensitive structure are located in the opening.
3. The liquid crystal display device according to claim 1, wherein the light shielding layer is located outside a plane on a side of the reflector plate facing away from the liquid crystal display panel.
4. The liquid crystal display device according to any one of claims 1 to 3, wherein the light shielding layer is multiplexed as a reflective layer.
5. The liquid crystal display device according to claim 4, wherein an orthogonal projection of the light shielding layer on the liquid crystal display panel covers an orthogonal projection of the opening on the liquid crystal display panel.
6. The liquid crystal display device according to any one of claims 1 to 3, further comprising: a grain identification chip, a chip for identifying grain,
the line identification chip is used for acquiring a first electric signal generated by the line identification structure at the image display stage of a line identification period; in the line identification stage of the line identification period, acquiring a second electric signal generated by the line identification structure; taking the first electric signal as a noise signal, and performing denoising processing on the second electric signal to determine texture image information;
the first electric signal is generated by light which is received by the texture recognition structure and directly emitted by the backlight module and passes through the opening;
the second electrical signal is generated by the light which is received by the texture recognition structure and directly emitted by the backlight module and passes through the opening and the light which passes through the opening after being reflected by the main body.
7. A method for recognizing a texture of a liquid crystal display device according to any one of claims 1 to 6, comprising: a plurality of line identification periods; the line recognition cycle includes: an image display stage and a line identification stage;
in the image display stage, acquiring a first electric signal generated by the texture recognition structure;
in the line identification stage, acquiring a second electric signal generated by the line identification structure;
and taking the first electric signal as a noise signal, and carrying out denoising processing on the second electric signal to determine the line image information.
8. The grain identification method according to claim 7,
in the image display stage, acquiring first electric signals generated by all the photosensitive elements; the first electric signal is generated by light which is received by the photosensitive element and directly emitted by the backlight module and passes through the imaging element for collimation;
at the line identification stage of the line identification period, acquiring second electric signals generated by the photosensitive elements; the second electric signal is generated by the light which is received by the photosensitive element and directly emitted by the backlight module and passes through the imaging element for collimation, and the light which is reflected by the main body and passes through the imaging element for collimation;
and taking the first electric signal as a noise signal, and performing denoising processing on the second electric signal corresponding to each photosensitive element according to the first electric signal corresponding to each photosensitive element to determine texture image information.
9. An electronic device comprising the liquid crystal display device according to any one of claims 1 to 6.
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| CN110119046B (en) * | 2019-05-31 | 2022-01-14 | 厦门天马微电子有限公司 | Display panel and display device |
| WO2020248169A1 (en) * | 2019-06-12 | 2020-12-17 | 京东方科技集团股份有限公司 | Skin ridge image acquisition method, skin ridge image acquisition circuit and display panel |
| CN110278299B (en) * | 2019-06-24 | 2021-10-19 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and image acquisition method |
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| US10073293B2 (en) * | 2016-04-12 | 2018-09-11 | The Board Of Trustees Of The University Of Illinois | Optical microcavity for a high-contrast display |
| US10078243B2 (en) * | 2016-06-03 | 2018-09-18 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
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| CN107505753B (en) * | 2017-09-15 | 2020-06-05 | 京东方科技集团股份有限公司 | Array substrate and display device |
| CN107977632B (en) * | 2017-12-05 | 2021-02-23 | 京东方科技集团股份有限公司 | Array substrate, display device and grain identification method thereof |
| CN108415188B (en) * | 2018-05-02 | 2021-11-16 | 上海中航光电子有限公司 | Liquid crystal display panel, display device and fingerprint unlocking method thereof |
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