CN110750007A - Display screen and display device with under-screen recognition function - Google Patents

Display screen and display device with under-screen recognition function Download PDF

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Publication number
CN110750007A
CN110750007A CN201911159610.5A CN201911159610A CN110750007A CN 110750007 A CN110750007 A CN 110750007A CN 201911159610 A CN201911159610 A CN 201911159610A CN 110750007 A CN110750007 A CN 110750007A
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light source
layer
light
quantum dots
display
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金国君
康永印
崔海
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Najing Technology Corp Ltd
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Najing Technology Corp Ltd
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • 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
    • 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
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • 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
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Human Computer Interaction (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Image Input (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention provides a display screen and a display device with an off-screen recognition function, comprising: a display layer having a fingerprint receiving area; the first quantum dot light conversion film is positioned below the display layer; the light source layer is positioned below the first quantum dot light conversion film and comprises a backlight light source which is used for exciting the first quantum dot light conversion film; the identification layer is positioned below the light source layer, the fingerprint identification device is positioned in the identification layer, and the orthographic projection of the fingerprint receiving area and the orthographic projection of the fingerprint identification device in the identification layer are at least partially overlapped; the auxiliary light source is arranged in parallel with the backlight light source, or the auxiliary light source is positioned in the fingerprint identification device, or the auxiliary light source is simultaneously arranged at the backlight light source and in the fingerprint identification device, and the light energy emitted by the auxiliary light source is identified by the fingerprint identification device. The invention solves the problems of low imaging quality and unstable identification existing in the under-screen identification of the display screen in the prior art.

Description

Display screen and display device with under-screen recognition function
Technical Field
The invention relates to the technical field of display equipment, in particular to a display screen with an off-screen recognition function and the display equipment.
Background
With the development of electronic consumer goods, the appearance of fingerprint unlocking not only meets the requirement of personal information safety, but also meets the requirement of simplicity and convenience in modern life. The fingerprint under the screen can well meet the requirement of people on personal information confidentiality, and can maximally realize the attractiveness and experience of the whole display device.
Underscreen fingerprints are currently mainly implemented in three ways: first, the fingerprint under the optical screen of the fingerprint loop is mainly detected by means of light reflection, and since an LCD (liquid crystal display) screen cannot self-illuminate, the current products supporting fingerprint identification under the optical screen all adopt OLED (organic light emitting semiconductor), but OLED is high in cost, so that the manufacturing cost of the display equipment is higher. Secondly, the ultrasonic type under-screen fingerprint identification technology is based on ultrasonic waves, and ultrasonic waves are firstly transmitted to the surface of a finger through a sensor and received by an echo. A3D image is constructed by utilizing the density difference between the fingerprint surface skin and the air, and then the 3D image is compared with the information existing on the terminal, so that the aim of identifying the fingerprint is fulfilled. The ultrasonic type underscreen fingerprint identification has the advantages of strong penetrability and high anti-stain capability. Even the condition of wet fingers and dirty fingers can be perfectly recognized. Ultrasound waves are extremely penetrating, which also supports in vivo testing. Because a 3D fingerprint identification image can be obtained, the security is higher compared with other under-screen fingerprint identification schemes. However, ultrasonic underscreen fingerprint identification also has a number of challenges that need to be addressed. Such as low imaging quality, less mature technology, lower throughput, etc. Therefore, the ultrasonic type under-screen fingerprint identification cannot be popularized and commercialized in a large range. Third, capacitive fingerprinting is relatively more sophisticated, but there are few difficulties in transferring it to the screen, and its poor penetration limits its development.
That is to say, there are the problem that the imaging quality is low, discernment is unstable in the discernment under the screen of display screen among the prior art.
Disclosure of Invention
The invention mainly aims to provide a display screen and display equipment with an off-screen identification function, and aims to solve the problems of low imaging quality and unstable identification existing in the off-screen identification of the display screen in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a display screen having an off-screen recognition function, including: the display layer is provided with a fingerprint receiving area and comprises a cover plate, a liquid crystal panel and an optical diaphragm, wherein the liquid crystal panel is positioned below the cover plate, and the optical diaphragm is positioned below the liquid crystal panel; the first quantum dot light conversion film is positioned below the display layer; the light source layer is positioned below the first quantum dot light conversion film, the light source layer comprises a backlight source, a light guide plate or a diffusion plate and a reflection sheet, the backlight source is used for exciting the first quantum dot light conversion film, and the reflection sheet is positioned below the light guide plate or the backlight source; the identification layer is positioned below the light source layer, the fingerprint identification device is positioned in the identification layer, and the orthographic projection of the fingerprint receiving area and the orthographic projection of the fingerprint identification device in the identification layer are at least partially overlapped; the auxiliary light source is arranged in parallel with the backlight light source, or the auxiliary light source is positioned in the fingerprint identification device, or the auxiliary light source is arranged at the backlight light source and in the fingerprint identification device at the same time; wherein the wavelength lambda of the light emitted by the auxiliary light source412The wavelength is larger than the wavelength lambda of the light emitted by at least part of the quantum dots in the first quantum dot light conversion film30The light energy emitted by the auxiliary light source is identified by the fingerprint identification device.
Further, the quantum dots in the first quantum dot light conversion film comprise at least one of blue quantum dots, green quantum dots, red quantum dots and infrared quantum dots.
Further, the quantum dots in the first quantum dot light conversion film comprise at least two of blue quantum dots, green quantum dots, red quantum dots and infrared quantum dots, wherein one of the blue quantum dots, the green quantum dots, the red quantum dots and the infrared quantum dots is an infrared quantum dot, and the wavelength lambda of light emitted by the infrared quantum dots is301＞780nm。
Further, the wavelength λ of the light emitted by the auxiliary light source412≥680nm。
Further, the energy of the light emitted by the infrared quantum dots accounts for 25% -50% of the energy of the light emitted by all the quantum dots in the first quantum dot light conversion film.
Further, the area of the orthographic projection of the fingerprint receiving area in the identification layer is smaller than or equal to the area of the orthographic projection of the fingerprint identification device in the identification layer.
Further, the fingerprint recognition device can recognize the wavelength λ of light51＞680nm。
Further, the cover plate is provided with an optical layer, the optical layer can realize visible light transmission in a wave band of 380nm to 780nm, the optical layer is provided with an opening, the opening is located above the fingerprint identification device, and the opening and the orthographic projection of the fingerprint identification device on the display layer are at least partially overlapped.
Further, a second quantum dot light conversion film is arranged on one side, facing the light source layer, of the fingerprint identification device.
According to another aspect of the present invention, there is provided a display device including the display screen having the off-screen recognition function described above.
By applying the technical scheme, the display screen with the screen-below identification function comprises a display layer, a light source layer, an identification layer and an auxiliary light source, wherein the display layer is provided with a fingerprint receiving area, the display layer comprises a cover plate, a liquid crystal panel and an optical diaphragm, the liquid crystal panel is positioned below the cover plate, and the optical diaphragm is positioned below the liquid crystal panel; the first quantum dot light conversion film is positioned below the display layer; the light source layer is positioned below the first quantum dot light conversion film, the light source layer comprises a backlight light source, a light guide plate or a diffusion plate and a reflector plate, the backlight light source is used for exciting the first quantum dot light conversion film, and the reflector plate is positioned below the light guide plate or the backlight light source; the identification layer is positioned below the light source layer, the fingerprint identification device is positioned in the identification layer, and the orthographic projection of the fingerprint receiving area and the fingerprint identification device in the identification layer is at least partially overlapped; the auxiliary light source and the backlight light source are arranged in parallel, or the auxiliary light source is positioned in the fingerprint identification device, or the auxiliary light source is arranged at the backlight light source and in the fingerprint identification device at the same time; wherein the wavelength lambda of the light emitted by the auxiliary light source412Greater than the first quantumWavelength λ of light emitted by at least a portion of the quantum dots in the dot light conversion film30The light energy emitted by the auxiliary light source is identified by the fingerprint identification device.
The first quantum dot light conversion film is arranged on the display screen, so that light emitted by the light source layer is converted to form white light containing red, green and blue components, and the white light is emitted to the display layer to realize display, so that patterns displayed by the display layer are more bright. When the finger is in contact with the display layer, a part of light is shielded and reflected by the finger, reflected light rays are different due to the difference of fingerprints, and when the reflected light with fingerprint information passes through the first quantum dot light conversion film, visible light components contained in the reflected light can be absorbed and converted by the first quantum dot light conversion film, so that the proportion of noise light such as visible light in the reflected light is effectively reduced. The display screen is arranged in the fingerprint identification device, so that the imaging quality of the display screen in the fingerprint identification device is improved, the accuracy of fingerprint identification is improved, and quick identification is realized. The liquid crystal panel is positioned below the cover plate so that the cover plate can protect the liquid crystal panel, the first quantum dot light conversion film converts light emitted by the light source layer and then emits the converted light to the liquid crystal panel, and display is formed on the liquid crystal panel. The optical film is positioned between the liquid crystal panel and the first quantum dot light conversion film, the first quantum dot light conversion film converts light emitted by the light source layer and then achieves brightness enhancement and polarization matching through the optical film, display on the liquid crystal panel is achieved, the light guide plate enables the light emitted by the backlight light source to be converted into the surface light source, the reflector plate reflects the light to the direction where the light guide plate is located, the light emitted by the backlight light source is enabled to be emitted to the display layer to achieve display, the utilization rate of the light emitted by the backlight light source is increased, and light loss of the light source in other directions is effectively reduced. The auxiliary light source is convenient for providing a light source for fingerprint identification, the fingerprint identification efficiency and quality under a dark state can be improved, and the wavelength lambda of light emitted by the auxiliary light source412Greater than the wavelength lambda of the light emitted by at least part of the quantum dots30The light that can reduce first quantum dot light conversion coating conversion is discerned by fingerprint identification device, and then has reduced the influence of the light that first quantum dot light conversion coating conversion to the reverberation, has increased fingerprint identification's accuracy.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic cross-sectional view illustrating an overall structure of a display screen according to a first embodiment of the present invention, wherein a backlight source is of a side-in type; and
FIG. 2 is a schematic cross-sectional view showing the overall structure of a display screen according to a second embodiment of the present invention;
FIG. 3 shows an angled view of the display screen of FIG. 2;
FIG. 4 is a schematic sectional view showing the overall structure of a display screen according to a third embodiment of the present invention;
fig. 5 is a schematic cross-sectional view illustrating an overall structure of a display panel according to a fourth embodiment of the present invention, wherein the backlight source is a direct-type backlight source.
Wherein the figures include the following reference numerals:
10. a display layer; 11. a cover plate; 12. a liquid crystal panel; 13. an optical film; 14. an optical layer; 141. an opening; 20. a finger; 30. a first quantum dot light conversion film; 40. a light source layer; 411. a backlight light source; 412. an auxiliary light source; 42. a light guide plate; 43. a reflective sheet; 44. a diffusion plate; 50. an identification layer; 51. a fingerprint recognition device; 52. a second quantum dot light conversion film; 60. reflecting the light.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
In order to solve the problems of low imaging quality and unstable identification of the under-screen identification of the display screen in the prior art, the invention provides the display screen with the under-screen identification function and display equipment.
As shown in fig. 1 to 5, the display panel with the off-screen identification function includes a display layer 10, a light source layer 40, an identification layer 50 and an auxiliary light source 412, the display layer 10 has a fingerprint receiving area, the display layer 10 includes a cover plate 11, a liquid crystal panel 12 and an optical film 13, the liquid crystal panel 12 is located below the cover plate 11, and the optical film 13 is located below the liquid crystal panel 12; a first quantum dot light conversion film 30, the first quantum dot light conversion film 30 being positioned below the display layer 10; the light source layer 40 is positioned below the first quantum dot light conversion film 30, the light source layer 40 includes a backlight light source 411, a light guide plate 42 or a diffusion plate 44, and a reflection sheet 43, the backlight light source 411 is used for exciting the first quantum dot light conversion film 30, and the reflection sheet 43 is positioned below the light guide plate 42 or the backlight light source 411; the identification layer 50 is positioned below the light source layer 40, the fingerprint identification device 51 is positioned in the identification layer 50, and the orthographic projection of the fingerprint receiving area and the fingerprint identification device 51 in the identification layer 50 is at least partially overlapped; the auxiliary light source 412 is arranged in parallel with the backlight light source 411, or the auxiliary light source 412 is positioned in the fingerprint identification device 51, or the auxiliary light source 412 is arranged at the backlight light source 411 and in the fingerprint identification device 51 at the same time; wherein the wavelength λ of the light emitted from the auxiliary light source 412412Greater than the wavelength λ of light emitted by at least some of the quantum dots in the first quantum dot light-conversion film 3030The light emitted from the auxiliary light source 412 can be recognized by the fingerprint recognition device 51.
The first quantum dot light conversion film 30 is disposed on the display screen to convert light emitted from the light source layer 40 into white light containing red, green and blue components, and the white light is emitted to the display layer 10 to realize display, so that the pattern displayed by the display layer 10 is more vivid. When the finger 20 contacts the display layer 10, a part of light is emitted by the handWhen the reflected light 60 passes through the first quantum dot light conversion film 30 with fingerprint information, the visible light component contained in the reflected light 60 can be absorbed and converted by the first quantum dot light conversion film 30, and the proportion of noise light such as visible light in the reflected light 60 is effectively reduced. The arrangement improves the imaging quality of the display screen in the fingerprint identification device 51, increases the accuracy of fingerprint identification and realizes quick identification. The liquid crystal panel 12 is located below the cover plate 11 to protect the liquid crystal panel 12 from the cover plate 11, the first quantum dot light conversion film 30 converts light emitted from the light source layer 40 and emits the converted light to the liquid crystal panel 12 to form a display on the liquid crystal panel 12, the optical film 13 is located between the liquid crystal panel 12 and the first quantum dot light conversion film 30, the first quantum dot light conversion film 30 converts light emitted from the light source layer 40 and emits the converted light to the optical film 13 to achieve brightness enhancement and polarization matching, so that quantum dot display on the liquid crystal panel 12 is achieved, the light guide plate 42 converts light emitted from the backlight source 411 to a surface light source, and the reflector 43 reflects the light in the direction of the light guide plate 42 to achieve display on the display layer 10, so that the utilization rate of the light emitted from the backlight source 411 is increased, and light loss of the light in other directions is effectively reduced. The reflection sheet 43 reflects the light emitted from the backlight source 411 toward the light guide plate 42 to direct the light emitted from the backlight source 411 toward the first quantum dot light conversion film 30, and the auxiliary light source 412 is disposed such that the fingerprint recognition device 51 provides a signal light source, thereby improving the fingerprint recognition efficiency and quality in a dark state, and simultaneously the auxiliary light source 412 emits light having a wavelength λ412Greater than the wavelength lambda of the light emitted by at least part of the quantum dots30The light converted by the first quantum dot light conversion film 30 can be reduced from being recognized by the fingerprint recognition device 51, so that the influence of the light converted by the first quantum dot light conversion film 30 on the reflected light 60 is reduced, and the accuracy of fingerprint recognition is improved.
In the present embodiment, the wavelength λ of lightnMeaning the peak wavelength in a segment of the spectrum.
The optical film 13 may realize brightness enhancement and polarization matching of the converted light of the first quantum dot light conversion film 30 through the combined action of the brightness enhancement sheet, the polarizer and the corresponding composite structure film, thereby realizing display on the liquid crystal panel 12. The brightness enhancement sheet and the polarizer can be selected from brightness enhancement sheets and polarizers which are conventional in the field.
The light guide plate 42 is disposed such that the light emitted from the backlight source 411 can be spread over the entire display screen, thereby reducing the phenomenon of uneven display on the display screen. The reflective sheet 43 reflects light toward the light guide plate 42 to enable light emitted from the backlight source 411 to be emitted toward the display layer 10 for display, so as to increase the utilization rate of light emitted from the backlight source 411. The arrangement of the light guide plate 42 and the reflective sheet 43 realizes conversion of the linear light source into the surface light source.
At least a part of light emitted by the light source layer 40 after being converted by the first quantum dot light conversion film 30 is emitted to the display layer 10 to realize display, the finger 20 is in contact with the display layer 10, so that the part of the light emitted to the display layer 10, which is blocked by the finger 20, is reflected to form reflected light 60, the reflected light 60 is emitted to the first quantum dot light conversion film 30, the visible light component in the reflected light 60 is absorbed and converted by the first quantum dot light conversion film 30, the identification layer 50 is positioned below the light source layer 40, the fingerprint identification device 51 is positioned in the identification layer 50, and the reflected light 60 passes through the first quantum dot light conversion film 30 and then passes through the fingerprint identification device 51 to identify fingerprint information in the reflected light 60.
It should be noted that the optical film 13 and the first quantum dot light conversion film 30 may be separate two-layer film structures, or of course, the two may also be a composite film structure combined together.
In the present application, the optical film 13 may include a brightness enhancement sheet, a polarizing plate, a composite structure of the brightness enhancement sheet and the polarizing plate, and the like.
Optionally, the quantum dots in the first quantum dot light conversion film 30 include at least one of blue quantum dots, green quantum dots, red quantum dots, and infrared quantum dots. The arrangement of the blue quantum dots, the green quantum dots and the red quantum dots can convert the light emitted from the light source layer 40 into white light containing three color components of red, green and blue, so that the color displayed by the display layer 10 is more vivid.
Optionally, the quantum dots in the first quantum dot light conversion film 30 include blue quantum dots, green quantum dotsAt least two of the sub-dots, the red quantum dots and the infrared quantum dots, wherein one of the sub-dots is the infrared quantum dot, and the wavelength lambda of the light emitted by the infrared quantum dot301> 780 nm. The infrared quantum dots can absorb and convert light in a visible light wave band, and the identification accuracy of the fingerprint identification device is improved. Blue quantum dot, green quantum dot and red quantum dot realize wide colour gamut and show, improve spectral composition simultaneously, reduce the heterochromatic light, improve colour purity to strengthen the display effect on display layer, and the light of infrared quantum dot transmission can be used for fingerprint identification through fingerprint contact and reflection. In the present application, the wavelength λ of the light emitted by the auxiliary light source 412412The light emitted from the infrared quantum dots can be recognized by the fingerprint recognition device 51, and when the auxiliary light source 412 is turned off or damaged, the fingerprint recognition function can be realized only by the cooperation of the backlight source 411 and the infrared quantum dots.
It should be noted that in the quantum dot display structure of the first quantum dot light conversion film 30, the backlight source 411 may select a visible light source with a wavelength less than 500nm or a white light source with a color temperature greater than 10000K as the backlight source, and in some preferred embodiments, a blue light source is used to excite the quantum dots to emit light. Of course, the backlight source 411 may also use blue-violet light, violet light or ultraviolet light as the light source.
The auxiliary light source 412 and the backlight light source 411 may be turned on and off simultaneously or differently, and may be set according to specific requirements.
It should be noted that the auxiliary light source 412 is disposed so that the display screen can realize fingerprint recognition in a dark state. When the backlight source 411 is not operated, fingerprint recognition may be performed only by means of light emitted from the auxiliary light source 412. That is, when the backlight source 411 is not operated, the light emitted from the auxiliary light source 412 is directed to the finger 20, the finger 20 reflects the light emitted from the auxiliary light source 412 to form the reflected light 60, and the reflected light 60 is directed to the fingerprint recognition device 51, so that the fingerprint recognition device 51 recognizes the fingerprint information in the reflected light 60. The fingerprint recognition device 51 recognizes more accurately in the dark state since there is no interference of other light to the fingerprint recognition device 51 in the dark state.
Of course, the fingerprint recognition in the dark state can also be performed in a manner that the auxiliary light source 412 is matched with the infrared quantum dots. That is, in the dark state, the light emitted from the auxiliary light source 412 is converted by the infrared quantum dots and emitted to the finger 20, the finger 20 reflects the light to form the reflected light 60, and the reflected light 60 is emitted to the fingerprint identification device 51, so that the fingerprint identification device 51 identifies the fingerprint information in the reflected light 60, thereby improving the identification accuracy of the display screen in the dark state. When the auxiliary light source 412 is matched with the infrared quantum dots to realize fingerprint identification, only the wavelength of light emitted by the infrared quantum dots needs to be matched with the fingerprint identification device 51.
Alternatively, the auxiliary light source 412 may be an infrared LED, or may be a QD-LED based on short-wave excitation of infrared quantum dots to emit infrared light, or an OLED or QLED implemented by electroluminescence.
The emission wavelength peak value of each quantum dot is used for defining the wavelength range of different quantum dots, and the wavelength range of blue quantum dots is more than 400nm and less than or equal to 490 nm; the green quantum dots have a wavelength of more than 490nm and less than or equal to 590 nm; the range of the red quantum dots is that the wavelength is greater than 590nm and less than or equal to 680 nm; the infrared quantum dots have a wavelength of 780nm to 2000 nm.
Note that, in the present application, the wavelength λ of the light emitted from the auxiliary light source 412 is412And not greater than the wavelength of light emitted by the infrared quantum dots, but greater than the wavelength of light emitted by the blue, red, and green quantum dots. The arrangement can greatly reduce the influence of light in a visible light wave band on the fingerprint identification device 51, and increase the stability and accuracy of identification of the fingerprint identification device 51.
Specifically, the wavelength λ of the light emitted from the auxiliary light source 412412Not less than 680 nm. In the present application, the light emitted by the auxiliary light source 412 may be red light between 680nm and 780nm, or may be near-infrared light greater than 780 nm. This arrangement can reduce the influence of visible light on the recognition of the fingerprint recognition device 51, and greatly increase the accuracy of the recognition of the fingerprint recognition device 51.
The energy of the light emitted from the infrared quantum dots accounts for 25% -50% of the energy of the light emitted from all the quantum dots in the first quantum dot light-conversion film 30. The arrangement is such that the blue quantum dots, the green quantum dots, and the red quantum dots all emit light while the infrared quantum dots in the first quantum dot light conversion film 30 emit light, and the display of the display layer 10 is not affected.
In some embodiments, the area of the orthographic projection of the fingerprint receiving area in the identification layer 50 is less than or equal to the area of the orthographic projection of the fingerprint identification device 51 in the identification layer 50.
In some preferred embodiments, the fingerprint receiving area and at least part of the orthographic projection of the fingerprint identification device 51 in the identification layer 50 coincide, so that the reflected light 60 reflected by a finger pressing on the fingerprint receiving area can be received by the fingerprint identification device 51, so that the collected fingerprint information can be transmitted to the fingerprint identification device 51, and the identification accuracy is increased.
In some preferred embodiments, the geometric center of the fingerprint receiving area coincides with the geometric center of the fingerprint identification device 51, and the orthographic projection of the fingerprint receiving area falls on the fingerprint identification device 51, so that the light reflected by the fingerprint receiving area can be effectively received by the fingerprint identification device 51, and the identification accuracy is greatly increased.
Alternatively, the fingerprint recognition device may recognize the wavelength λ of light51Is more than 680 nm. The arrangement enables the fingerprint identification device to identify the light emitted by the auxiliary light source 412 and also to identify the light emitted by the infrared quantum dots.
Preferably, the fingerprint recognition device can recognize the wavelength λ of light51Is more than or equal to 900 nm. Therefore, the influence of the light of the red light wave band in the visible light on the identification can be reduced, and the accuracy of the identification of the fingerprint identification device is greatly improved.
In some embodiments, the backlight light source 411 may be, but is not limited to, a general LED light source, a mini-LED, a micro-LED, or the like.
In some embodiments, the peak wavelength of the light emitted by the backlight light source 411 is 380nm or more and 480nm or less. In some preferred embodiments, the peak wavelength of the light emitted by the backlight source 411 is greater than or equal to 450nm and less than or equal to 480 nm.
Example one
As shown in fig. 1, the backlight source 411 is located at one side of the display screen, forming a side-in light source layer. In the present embodiment, the display screen has only the light guide plate 42 without the diffusion plate 44, and the reflection sheet 43 is located only below the light guide plate 42.
Example two
The difference from the first embodiment is that the specific structure of the cover plate 11 is different.
In the embodiment shown in fig. 2 and fig. 3, the cover plate 11 has the optical layer 14, the optical layer 14 can realize visible light transmission in a wavelength range from 380nm to 780nm, the optical layer 14 has an opening 141, the opening 141 is located above the fingerprint identification device 51, the opening 141 and the orthographic projection of the fingerprint identification device 51 on the display layer 10 at least partially coincide, and the optical layer 14 is disposed to not only avoid the influence of external light on fingerprint identification, but also prevent infrared light from overflowing, thereby further ensuring the identification accuracy. In some preferred embodiments, the opening 141 is located directly above the fingerprint identification device 51, and the area of the orthographic projection of the opening 141 on the display layer 10 is greater than or equal to the area of the orthographic projection of the fingerprint identification device 51 on the display layer 10. The area of the fingerprint of the finger 20 that can be collected is set up like this to be bigger to realize the fingerprint identification function smoothly, increased the accuracy of fingerprint identification.
Of course, the optical layer 14 can transmit light in a used wavelength band, and no opening is formed on the optical layer 14, so that the optical layer can realize fingerprint identification in the range of the whole screen.
EXAMPLE III
The difference from the first embodiment is that a second quantum dot light conversion film 52 is further provided at the fingerprint recognition device 51.
As shown in fig. 4, the fingerprint recognition device 51 is provided with a second quantum dot light conversion film 52 on the side facing the light source layer 40, and the emission wavelength λ of the quantum dot material in the second quantum dot light conversion film 5252Less than the wavelength of light recognizable by fingerprint recognition device 51. Therefore, the second quantum dot light conversion film 52 can absorb and convert the visible light component in the light directed to the fingerprint recognition device 51 into the light having the wavelength λ52Of light of, and a second amountThe wavelength λ of light emitted from the sub-dot light conversion film 5252Cannot be recognized by the fingerprint recognition device 51, and only needs to have the wavelength λ52The light filtering can be performed, the influence of visible light is reduced, and the identification accuracy is improved. Meanwhile, the second quantum dot light conversion film 52 is disposed on the fingerprint identification system, so that the influence of other light in the light source layer 40 during the identification process of the fingerprint identification device 51 can be reduced, and the identification accuracy is further ensured.
Example four
The difference from the first embodiment is that the position of the backlight source 411 is different.
As shown in fig. 5, the backlight source 411 may be located below the display layer 10 to form a direct-type light source layer. The dashed triangles provided in fig. 5 mainly play a supporting role in the structure. It should be clear that in the embodiment of the direct-illumination type light source layer, the display panel only has the diffusion plate 44 without the light guide plate 42, and the reflection sheet 43 is only located under the backlight light source 411.
The embodiments described above are separate and distinct features, which may, of course, also be partly superimposed on each other in one embodiment.
A display device comprises the display screen with the off-screen identification function. The display device may be, but is not limited to, a mobile phone, a computer, a television, an electronic teaching blackboard, and the like.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the first quantum dot light conversion film 30 reduces interference of visible light to the reflected light 60, can absorb and convert light in a visible light waveband, realizes wide color gamut display, improves spectral components, reduces stray light, and improves color purity, so that the display effect of the display layer is enhanced, and the accuracy of identification by the fingerprint identification device 51 can be improved.
2. The auxiliary light source 412 enables the display screen to be recognized in a dark state, and due to the fact that the display screen is not affected by visible light in the dark state, accuracy of recognition of the display screen in the dark state is improved, and therefore rapid recognition can be achieved.
3. The display screen in this application is difficult for receiving the influence of visible light, has discernment accuracy, stable effect. A feasible and economical scheme is provided for realizing the under-screen fingerprint identification based on the liquid crystal screen.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A display screen with an off-screen recognition function, comprising:
a display layer (10), the display layer (10) having a fingerprint receiving area, the display layer comprising a cover plate (11), a liquid crystal panel (12), and an optical film (13), the liquid crystal panel (12) being located below the cover plate (11), the optical film (13) being located below the liquid crystal panel (12);
a first quantum dot light conversion film (30), the first quantum dot light conversion film (30) being located below the display layer (10);
a light source layer (40), the light source layer (40) being located below the first quantum dot light conversion film (30), the light source layer (40) including a backlight light source (411), a light guide plate (42) or a diffusion plate (44), a reflective sheet (43), the backlight light source (411) being for exciting the first quantum dot light conversion film (30), the reflective sheet (43) being located below the light guide plate (42) or the backlight light source (411);
an identification layer (50), said identification layer (50) being located below said light source layer (40), fingerprint identification means (51) being located within said identification layer (50), said fingerprint receiving area and an orthographic projection of said fingerprint identification means (51) in said identification layer (50) at least partially coinciding;
an auxiliary light source (412), wherein the auxiliary light source (412) is arranged in parallel with the backlight light source (411), or the auxiliary light source is positioned in the fingerprint identification device (51), or the auxiliary light source (412) is arranged at the backlight light source (411) and in the fingerprint identification device (51) at the same time;
wherein the wavelength λ of the light emitted by the auxiliary light source (412)412Is larger than the wavelength lambda of the light emitted by at least part of the quantum dots in the first quantum dot light conversion film (30)30The light emitted by the auxiliary light source (412) can be identified by the fingerprint identification device (51).
2. The display screen with the function of identifying screen according to claim 1, wherein the quantum dots in the first quantum dot light conversion film (30) comprise at least one of blue quantum dots, green quantum dots, red quantum dots and infrared quantum dots.
3. The display screen with the function of identifying under screen as claimed in claim 1, whereinThe quantum dots in the first quantum dot light conversion film (30) comprise at least two of blue quantum dots, green quantum dots, red quantum dots and infrared quantum dots, wherein one of the blue quantum dots, the green quantum dots, the red quantum dots and the infrared quantum dots is the infrared quantum dots, and the wavelength lambda of light emitted by the infrared quantum dots is301＞780nm。
4. A display screen with an underscreen identification function according to claim 1, characterised in that the wavelength λ of the light emitted by the auxiliary light source (412)412≥680nm。
5. The display screen with the function of identifying screen down, as recited in claim 3, wherein the energy of the light emitted by the infrared quantum dots accounts for 25% -50% of the energy of the light emitted by all the quantum dots in the first quantum dot light conversion film (30).
6. A display screen with an off-screen identification function according to claim 1, wherein the area of the orthographic projection of the fingerprint receiving area in the identification layer (50) is smaller than or equal to the area of the orthographic projection of the fingerprint identification device (51) in the identification layer (50).
7. A display screen with an underscreen identification function according to claim 1, characterised in that the fingerprint identification means (51) can identify the wavelength λ of light51＞680nm。
8. The display screen with the function of underscreen identification according to one of claims 1 to 7, characterised in that the cover plate (11) has an optical layer (14), the optical layer (14) being capable of visible light transmission in the wavelength range from 380nm to 780nm, the optical layer (14) having an opening (141), the opening (141) being located above the fingerprint identification means (51), the opening (141) at least partially coinciding with an orthographic projection of the fingerprint identification means (51) on the display layer (10).
9. The display screen with the function of identifying under screen according to any one of claims 1 to 7, characterized in that the fingerprint identification device (51) is provided with a second quantum dot light conversion film (52) on the side facing the light source layer (40).
10. A display device characterized by comprising the display screen with an off-screen recognition function of any one of claims 1 to 9.
CN201911159610.5A 2019-11-22 2019-11-22 Display screen and display device with under-screen recognition function Pending CN110750007A (en)

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CN112014992A (en) * 2020-09-11 2020-12-01 武汉华星光电技术有限公司 Liquid crystal display screen and liquid crystal display device
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CN113296306A (en) * 2021-06-03 2021-08-24 武汉天马微电子有限公司 Liquid crystal display device
WO2021168973A1 (en) * 2020-02-26 2021-09-02 武汉华星光电技术有限公司 Liquid crystal display device
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WO2021168973A1 (en) * 2020-02-26 2021-09-02 武汉华星光电技术有限公司 Liquid crystal display device
CN111723771A (en) * 2020-06-30 2020-09-29 京东方科技集团股份有限公司 Display device and manufacturing method thereof
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