CN110929699A - Display module, fingerprint identification method and preparation method thereof, and display device - Google Patents
Display module, fingerprint identification method and preparation method thereof, and display device Download PDFInfo
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- CN110929699A CN110929699A CN201911327692.XA CN201911327692A CN110929699A CN 110929699 A CN110929699 A CN 110929699A CN 201911327692 A CN201911327692 A CN 201911327692A CN 110929699 A CN110929699 A CN 110929699A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
The embodiment of the invention provides a display module, a fingerprint identification method, a preparation method and a display device of the display module, wherein the display module comprises a display substrate, a fingerprint identification film layer and a control film layer, the display substrate, the fingerprint identification film layer and the control film layer are oppositely arranged, the control film layer is positioned between the display substrate and the fingerprint identification film layer, the display substrate comprises a visible area and an ink area surrounding the periphery of the visible area, the ink area comprises a light-transmitting area, and the control film layer is used for controlling whether light rays of the light-transmitting area pass or not; so as to realize the optical fingerprint identification in the screen.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display module, a fingerprint identification method and a preparation method thereof, and a display device.
Background
As a simple and convenient human-computer interaction mode, the touch display screen has been widely applied in the fields of electronic devices, vehicle-mounted devices, and the like. At present, touch display screen all need carry out laminating production with touch module assembly and display module assembly, just can form complete touch display screen.
Touch display screen is according to the difference of laminating production methods, divide into full laminating screen and non-full laminating screen again, and the screen of comparatively mainstream at present is regarded as to full laminating screen, and it compares non-full laminating screen, does not have the air bed between display screen and the touch-sensitive screen, can avoid in the dust gets into the screen, improves laminating quality and display effect. Simultaneously, can also reduce the thickness of monoblock screen, promote user's sense of touch.
However, the fingerprint recognition module of the current touch screen is located outside the display area, and occupies a certain screen ratio. In order to improve the screen occupation ratio of terminals such as mobile phones and the like, the lower screen fingerprint becomes a reliable technical solution, the most common scheme is that an optical fingerprint identification scheme and an OLED display screen are adopted at present, and the principle is that when light irradiates the ridge lines of the finger, the light can be reflected and passes through the screen to reach an optical sensor, so that fingerprint identification is realized. The OLED screen has the advantages of self-luminescence and good light transmittance, and the fingerprint recognition rate under the screen is greatly improved by matching with an optical screen. If the fingerprint sensor is placed on the glass substrate by adopting a periodic microarray technology, the fingerprint identification under the screen at any position can be realized theoretically, however, the conventional TFT-LCD display screen does not emit light, and the light passing through the color film substrate needs to be controlled to normally display. In order to avoid light leakage and color crosstalk, BM regions (opaque ink regions) are disposed between sub-pixels on the color filter substrate, so that the optical underscreen fingerprint recognition cannot be realized.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a display module, a fingerprint identification method, a preparation method and a display device thereof, so as to realize optical on-screen fingerprint identification.
In order to solve the technical problem, an embodiment of the present invention provides a display module, which includes a display substrate, a fingerprint identification film layer and a control film layer located between the display substrate and the fingerprint identification film layer, wherein the display substrate includes a visible area and an ink area surrounding the visible area, the ink area includes a light-transmitting area, and the control film layer is used for controlling whether light of the light-transmitting area passes through or not.
Optionally, the control film layer includes a first electrode, a second electrode and a control module, the first electrode and the second electrode are oppositely disposed, the control module is disposed opposite to the light-transmitting region, and the control module transmits light under a certain voltage to allow light in the light-transmitting region to pass through.
Optionally, the control module includes a PDMS film layer and electrostrictive film layers located on opposite sides of the PDMS film layer, where the electrostrictive film layers stretch the PDMS film layer at a certain voltage, so that the PDMS film layer transmits light.
Optionally, the first electrode and the second electrode are both transparent electrodes.
Optionally, the electrostrictive film layer is made of a polyurethane elastomer material.
Optionally, the thickness of the electrostrictive film layer is 0.1mm to 2 mm.
Optionally, the display substrate is a color film substrate.
Optionally, the fingerprint identification film further comprises an array substrate, a polarizer and a substrate, wherein the array substrate is located on one side of the fingerprint identification film layer, which is far away from the control film layer.
In order to solve the above technical problem, an embodiment of the present invention further provides a fingerprint identification method for a display module, including:
during fingerprint identification, the control film layer controls light rays of the light-transmitting area to pass through so as to be identified by the fingerprint identification film layer;
when a picture is displayed, the control film layer prevents light of the light-transmitting area from passing through.
In order to solve the above technical problem, an embodiment of the present invention further provides a display device, including a display module and a fingerprint identification film layer, which are stacked, where the display module is the foregoing display module.
In order to solve the above technical problem, an embodiment of the present invention further provides a method for manufacturing a display module, including:
forming a display substrate, wherein the display substrate comprises a visual area and an ink area surrounding the visual area, and the ink area comprises a light-transmitting area;
forming a control film layer over the display substrate;
and forming a fingerprint identification film layer on the control film layer, wherein the control film layer is used for controlling whether the light of the light-transmitting area passes through or not.
The invention provides a display module and a preparation method thereof, a display device and a fingerprint identification method thereof, wherein when a fingerprint is identified, a film layer is controlled to control light rays of a light-transmitting area to pass through so as to be identified by a fingerprint identification film layer, so that the fingerprint identification in an optical screen is realized, and the fingerprint identification position can be located at any position of a display area; when the picture is displayed, the control film layer prevents the light rays in the light-transmitting area from passing through so as to ensure the quality of the displayed picture and avoid the bad phenomena of light leakage, color crosstalk and the like.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention. The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
FIG. 1 is a schematic structural diagram of a conventional display module;
FIG. 2 is a cross-sectional view of a display module according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a display module according to a first embodiment of the present invention;
FIG. 4 is a cross-sectional view of a film layer of a display module according to a first embodiment of the present invention;
FIG. 5 is a cross-sectional view of a display module assembly showing a control film layer opaque to light according to a first embodiment of the present invention;
FIG. 6 is a graph showing the relationship between the strain rate and the electric field of the electrostrictive film in the first embodiment of the present invention;
FIG. 7 is a flowchart illustrating a fingerprint identification method of a display module according to a second embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Fig. 1 is a schematic structural diagram of a conventional display module. As shown in fig. 1, the existing display module includes a display substrate 100 and a fingerprint recognition film 600, the display substrate 100 includes a visible region 200 and an ink region 300 surrounding the visible region 200, and the ink region 300 is an opaque region to avoid the display module from generating undesirable phenomena such as light leakage and cross color. However, when light contacts the finger, the ridges of the finger reflect the light back into the display module, and the reflected light cannot pass through the ink area 300 due to the light-tight property of the ink area 300. Moreover, since the visible region 200 includes a red sub-pixel region, a blue sub-pixel region and a green sub-pixel region, the red sub-pixel region only transmits red light, the green sub-pixel region only transmits green light, and the blue sub-pixel region only transmits blue light, most of the reflected light will be lost through the visible region 200, i.e., the optical transmittance is not high, and the identification requirement of the fingerprint identification film 600 cannot be met.
Fig. 2 is a schematic structural diagram of a display module according to an embodiment of the invention. The problem that the existing display module cannot realize fingerprint identification under an optical screen is solved. As shown in fig. 2, an embodiment of the present invention provides a display module, which includes a display substrate 100, a fingerprint identification film 600 and a control film 400 located between the display substrate 100 and the fingerprint identification film 600, wherein the display substrate 100 includes a visible region 200 and an ink region 300 surrounding the visible region 200, the ink region 300 includes a light-transmitting region 500, and the control film 400 is used to control whether light of the light-transmitting region 500 passes through. When light contacts the finger, when pointing the ridge line with light reflection back display module in, the light of control rete 400 control printing opacity region 500 passes through, and reflection light passes through printing opacity region 500 and control rete 400 and transmits to fingerprint identification rete 600, makes fingerprint identification rete 600 can discern the reflection light of fingerprint to fingerprint identification in realizing display module optical type screen.
The technical solution of the present invention will be described in detail by the following specific examples.
First embodiment
FIG. 3 is a schematic structural diagram of a display module according to a first embodiment of the present invention; FIG. 4 is a cross-sectional view of a film layer of a display module according to a first embodiment of the present invention; FIG. 5 is a cross-sectional view illustrating a control film layer in a display module assembly according to a first embodiment of the present invention. Take the display module as an example of an LCD display module. As shown in fig. 3, 4 and 5, the display module includes a display substrate 100, a fingerprint identification film 600 and a control film 400 between the display substrate 100 and the fingerprint identification film 600, the display substrate 100 includes a visible region 200 and an ink region 300 surrounding the visible region 200, the ink region 300 includes a light-transmitting region 500, and the control film 400 is used for controlling whether light of the light-transmitting region 500 passes through. The display substrate 100 is a color film substrate. The light-transmitting area 500 can transmit light of any color, for example, red light, green light, blue light, etc., thereby increasing the light transmittance of the ink area 300.
As shown in fig. 4, the control film 400 includes a first electrode 410, a second electrode 420 and a control module 430 located between the first electrode 410 and the second electrode 420, the control module 430 is disposed opposite to the light-transmitting region 500, and after the first electrode 410 and the second electrode 420 are powered on, a certain voltage or electric field is applied to the control module 430 to make the control module 430 transmit light, so that the control module 430 controls the light of the light-transmitting region 500 to pass through, so as to be recognized by the fingerprint recognition film 600. That is to say, the light reflected by the fingerprint above the ink area 300 can be identified by the fingerprint identification film 600 through the light-transmitting area 500 and the control module 430, so as to realize the fingerprint identification in the display module optical screen. The first electrode 410 and the second electrode 420 are transparent electrodes.
As shown in fig. 4, the control module 430 includes a PDMS (polydimethylsiloxane) film layer 4301 and electrostrictive film layers 4302 located on two opposite sides of the PDMS film layer 4301. The first electrode 410 and the second electrode 420 are electrically connected to the electrostrictive film layer 4302, and after the first electrode 410 and the second electrode 420 are powered on, a certain voltage or electric field is applied to the electrostrictive film layer 4302 to stretch the electrostrictive film layer 4302, so that the PDMS film layer 4301 is stretched to transmit light, and thus light in the light transmission region 500 passes through to be recognized by the fingerprint recognition film layer 600. For example, when 4kpa is applied to the electrostrictive film layer, the light transmittance of the PDMS film layer 4301 is 30%; when 8kpa is applied to the electrostrictive film layer, the light transmittance of the PDMS film layer 4301 is 60%; when 12kpa was applied to the electrostrictive film layer, the light transmittance of the PDMS film layer 4301 was 100%.
In the embodiment, the PDMS film is made by mixing a rectangular transparent polydimethylsiloxane stack sheet with a solution containing black micro-dye particles, and the PDMS film is a black PDMS film. When the PDMS film is not stretched, the PDMS film is black and opaque. When the PDMS film is stressed and stretched and deformed, the PDMS film is gradually in a transparent state, and a large amount of light penetrates through the film.
In the embodiment, the electrostrictive film material may be made of various materials as long as the electrostrictive film material can be shrunk under a certain voltage or electric field. Specifically, the length of the electrostrictive film changes with the voltage loaded at the two ends of the electrostrictive film. The length change formula of the electrostrictive film layer is as follows: x ═ RE2. Wherein X is the strain of the electrostrictive film material under the action of voltage/electric field, and E is the voltage value/electric field strength loaded at two ends of the electrostrictive filmAnd R is the expansion coefficient of the electrostriction film layer. The electrostrictive film layer is taken as an example of a polyurethane elastomer material for explanation. The R value is related to the concentration of doped particles in the electrostrictive film material and the thickness of the electrostrictive film. When the thickness of the electrostriction film layer is 0.1mm-2mm, the quadratic relation between the strain capacity of the electrostriction film layer and the voltage value/electric field intensity is kept unchanged, and the strain capacity is more obvious along with the increase of the coefficient R value.
FIG. 6 is a graph showing the relationship between the strain rate and the electric field of the electrostrictive film layer in the first embodiment of the present invention. As shown in fig. 6, the abscissa in fig. 6 is the electric field strength applied to the electrostrictive film layer, and the ordinate is the strain rate of the electrostrictive film layer. The strain amount of the polyurethane elastomer material with different doped particle concentrations under different electric field strengths is different. As shown in fig. 6, the strain amounts of the polyurethane elastomer materials doped with 5% barium titanate, 6% barium titanate, 0% barium titanate, 12% barium titanate, 18% barium titanate, 20% barium titanate, and 16% barium titanate at different electric field strengths are shown, respectively. When the thickness of the electrostriction film layer is 1mm and the voltage for loading the electrostriction film layer is 3V (the electric field intensity is 1MV/m), the deformation amount of the polyurethane elastomer material doped with 6 percent of barium titanate is the best and reaches 50 percent.
As shown in fig. 4 and fig. 5, in the display module according to the embodiment of the invention, in the normal state, the first electrode 410 and the second electrode 420 are in the non-energized state, the electrostrictive film 4302 is in the expanded state, and the PDMS film 4301 is not stressed and is in the black opaque state, as shown in fig. 5. When a fingerprint unlocking command is started, the first electrode 410 and the second electrode 420 are electrified, the electrostrictive film layer 4302 contracts under the action of an electric field, and the PDMS film layer 4301 is stretched to enable the PDMS film layer 4301 to be in a transparent state. The light reflected by the ridges of the fingerprint passes through the light-transmitting area 500 and the control film layer 400 and penetrates downwards to reach the fingerprint identification film layer 600, so that the fingerprint identification function is completed, as shown in fig. 4. After the screen is unlocked, the first electrode 410 and the second electrode 420 are powered off, and the PDMS film layer 4301 returns to the black opaque state again, so that the ink area 300 is opaque. According to the display module, any position of a screen contacted by a finger is changed, the light transmittance is improved, and the optical fingerprint identification function of any position of an LCD can be realized.
As shown in fig. 4, the display module according to the embodiment of the invention further includes an array substrate 700, a polarizer 800 and a substrate 900, which are located on a side of the fingerprint identification film 600 away from the control film 400.
According to the display module, when fingerprints are identified, the film layer is controlled to control light rays of the light-transmitting area to pass through so as to be identified by the fingerprint identification film layer, and therefore fingerprint identification in the optical screen is achieved; when the picture is displayed, the control film layer prevents the light rays in the light-transmitting area from passing through so as to ensure the quality of the displayed picture and avoid the bad phenomena of light leakage, color crosstalk and the like.
Second embodiment
FIG. 7 is a flowchart illustrating a fingerprint identification method of a display module according to a second embodiment of the present invention. As shown in fig. 7, based on the technical idea of the foregoing embodiment, the present invention further provides a fingerprint identification method of the display module, including:
during fingerprint identification, the control film layer controls light rays of the light-transmitting area to pass through so as to be identified by the fingerprint identification film layer; when the fingerprint identification is performed, when light contacts the finger, the ridges of the finger reflect the light back into the display module.
When a picture is displayed, the control film layer prevents light of the light-transmitting area from passing through. Wherein, the display screen indicates that the display module assembly unblocks after fingerprint identification, when the display module assembly picture shows.
According to the fingerprint identification method of the display module, any position of the screen contacted by the finger is changed, the light transmittance is improved, and the fingerprint identification in the optical screen can be realized.
Third embodiment
Based on the technical concept of the foregoing embodiment, the invention further provides a display device, which includes the display module of the foregoing embodiment. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
The display device provided by the embodiment of the invention can realize optical on-screen fingerprint identification.
Fourth embodiment
Based on the technical concept of the foregoing embodiment, the present invention further provides a method for manufacturing a display module, including:
forming a display substrate, wherein the display substrate comprises a visual area and an ink area surrounding the visual area, and the ink area comprises a light-transmitting area;
forming a control film layer over the display substrate;
and a fingerprint identification film layer is formed on the control film layer, and the control film layer is used for controlling whether the light rays of the light transmission area pass through or not so as to be identified by the fingerprint identification film layer.
The display module prepared by the preparation method of the display module can realize fingerprint identification in an optical screen.
In the description of the embodiments of the present invention, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. The utility model provides a display module assembly, its characterized in that, includes relative display substrate, fingerprint identification rete and the position that sets up display substrate with control rete between the fingerprint identification rete, display substrate includes visual region and centers on visual region printing ink region all around, printing ink region is including the printing opacity region, the control rete is used for control whether the light of printing opacity region passes through.
2. The display module according to claim 1, wherein the control film layer comprises a first electrode, a second electrode and a control module disposed between the first electrode and the second electrode, the control module is disposed opposite to the transparent region, and the control module transmits light under a certain voltage to allow light in the transparent region to pass through.
3. The display module of claim 2, wherein the control module comprises a PDMS film and electrostrictive films disposed on opposite sides of the PDMS film, and the electrostrictive films stretch the PDMS film under a certain voltage to make the PDMS film transparent.
4. The display module of claim 2, wherein the first electrode and the second electrode are transparent electrodes.
5. The display module of claim 3, wherein the electrostrictive film is a polyurethane elastomer material.
6. The display module of claim 3, wherein the thickness of the electrostrictive film layer is 0.1mm to 2 mm.
7. The display module of claim 1, wherein the display substrate is a color film substrate.
8. The display module of claim 1, further comprising an array substrate, a polarizer and a substrate on a side of the fingerprint identification film layer away from the control film layer.
9. A fingerprint identification method for a display module according to any one of claims 1 to 8, comprising:
during fingerprint identification, the control film layer controls light rays of the light-transmitting area to pass through so as to be identified by the fingerprint identification film layer;
when a picture is displayed, the control film layer prevents light of the light-transmitting area from passing through.
10. A display device, characterized in that, includes display module assembly and fingerprint identification rete that the stack set up, the display module assembly is any one of claims 1-8.
11. A preparation method of a display module is characterized by comprising the following steps:
forming a display substrate, wherein the display substrate comprises a visual area and an ink area surrounding the visual area, and the ink area comprises a light-transmitting area;
forming a control film layer over the display substrate;
and forming a fingerprint identification film layer on the control film layer, wherein the control film layer is used for controlling whether the light of the light-transmitting area passes through or not.
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| CN201911327692.XA CN110929699A (en) | 2019-12-20 | 2019-12-20 | Display module, fingerprint identification method and preparation method thereof, and display device |
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