CN110441944B - Display panel and display device - Google Patents
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- CN110441944B CN110441944B CN201910700260.2A CN201910700260A CN110441944B CN 110441944 B CN110441944 B CN 110441944B CN 201910700260 A CN201910700260 A CN 201910700260A CN 110441944 B CN110441944 B CN 110441944B
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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
- G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses
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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
- G02F1/133528—Polarisers
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1347—Preprocessing; Feature extraction
- G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
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Abstract
The invention discloses a display panel and a display device, wherein the display panel comprises a color film substrate, an array substrate and a liquid crystal layer, wherein the color film substrate and the array substrate are arranged oppositely, and the liquid crystal layer is clamped in the color film substrate and the array substrate; the color film substrate comprises a first substrate, wherein a black matrix is arranged on one side of the first substrate, which is close to the array substrate, and comprises a plurality of first openings and a plurality of second openings; a light adjusting layer is arranged on one side of the first substrate, which is far away from the array substrate, and the part of the light adjusting layer, which corresponds to the first opening, is used for converging light entering the light adjusting layer from the side, which is far away from the first substrate, of the light adjusting layer to the first opening; the array substrate comprises a second substrate, wherein one side of the second substrate, which is close to the color film substrate, is provided with a plurality of light sensing elements and a plurality of pixel electrodes, the light sensing elements are arranged corresponding to the first openings, and the pixel electrodes are arranged corresponding to the second openings; the light adjusting layer, the first opening, and the light sensing element are at least partially overlapped in a direction perpendicular to the first substrate. The invention realizes the identification of the fingerprint under the screen and has high identification precision.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
With the rapid development of display technology, display panels with fingerprint identification function have gradually spread throughout the life of people, and fingerprint identification is widely applied to display screens of electronic devices such as mobile phones, personal digital assistants, computers and the like. A fingerprint is a permanent feature unique to the human body and distinguishable from others, and is composed of a series of ridges and valleys on the surface of the skin at the finger tip, the details of which typically include the branches of the ridges, the ends of the ridges, the arches, the tent arches, the left-handed, right-handed, spiral, or double-handed details, which determine the uniqueness of the fingerprint pattern.
The fingerprint identification unit with liquid crystal display panel sets up on backlight unit usually among the prior art, just needs to trompil backlight unit with the fingerprint identification unit setting on being shaded, so just influenced the homogeneity of backlight luminance, need corresponding method to carry out optical compensation, also need make the collimation hole moreover, and the fingerprint identification unit just can acquire accurate fingerprint image.
Disclosure of Invention
The present invention provides a display panel and a display device to solve the above problems.
On one hand, the invention discloses a display panel, which comprises a color film substrate, an array substrate and a liquid crystal layer, wherein the color film substrate and the array substrate are arranged oppositely, the liquid crystal layer is clamped between the color film substrate and the array substrate, and the liquid crystal layer comprises first liquid crystal molecules;
the color film substrate comprises a first substrate, a black matrix is arranged on one side of the first substrate, which is close to the array substrate, and the black matrix comprises a plurality of first openings and a plurality of second openings;
a light adjusting layer is arranged on one side, far away from the array substrate, of the first substrate, and the part, corresponding to the first opening, of the light adjusting layer is used for converging light entering the light adjusting layer from one side, far away from the first substrate, of the light adjusting layer to the first opening;
the array substrate comprises a second substrate, wherein one side of the second substrate, which is close to the color film substrate, is provided with a plurality of light sensing elements and a plurality of pixel electrodes, the light sensing elements are arranged corresponding to the first openings, and the pixel electrodes are arranged corresponding to the second openings;
the light adjusting layer, the first opening and the light sensing element are at least partially overlapped in a direction perpendicular to the first substrate.
In another aspect, the invention further provides a display device comprising the display panel.
Compared with the prior art, the display panel and the display device provided by the invention at least realize the following beneficial effects:
in the invention, the light sensing element is arranged on the array substrate, so that the problem of poor backlight brightness uniformity caused by the fact that holes need to be formed in the backlight when the light sensing element is arranged on one side of the backlight is solved;
according to the invention, the part of the light adjusting layer corresponding to the first opening is adopted to converge the light entering the light adjusting layer from the side, away from the first substrate, of the light adjusting layer to the first opening, so that the reflected light on the light sensing element is fingerprint fragment information to be identified, and the fingerprint information which can cause interference is blocked by the black matrix and cannot reach the light sensing element, so that the interference is reduced and the fingerprint identification precision is improved; it should be noted that, since the light adjusting layer can converge the light to the first opening, and the collimating hole is not required to be formed, and a corresponding film layer is required to be added for forming the collimating hole, the manufacturing process is reduced;
in addition, because the light sense element is arranged corresponding to the first opening, the pixel electrode is arranged corresponding to the second opening, and the light sense element and the pixel electrode are not overlapped, the light adjusting layer is arranged to enable light to be converged to the first opening for fingerprint identification, and meanwhile, the brightness of the display panel is not influenced, and the normal display of the display panel is not influenced.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic view of a display module;
FIG. 2 is a schematic plan view of a display panel according to the present invention;
FIG. 3 is a cross-sectional view taken along line A-A' of FIG. 2;
FIG. 4 is a further sectional view taken along line A-A' of FIG. 2;
FIG. 5 is a cross-sectional view taken along line B-B' of FIG. 2, showing a second liquid crystal molecule in a first state;
FIG. 6 is a cross-sectional view taken along line B-B' of FIG. 2, showing a second state of the second liquid crystal molecules;
FIG. 7 is a further sectional view taken along line A-A' of FIG. 2;
FIG. 8 is a further sectional view taken along line A-A' of FIG. 2;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In a display panel with a fingerprint recognition function, poor backlight brightness uniformity often occurs. In order to improve the inaccurate phenomenon caused by the fingerprint identification process and improve the display quality, the inventor carries out the following research on the display panel provided by the prior art:
referring to fig. 1, fig. 1 is a schematic structural diagram of a display module. As shown in fig. 1, the display module 00 includes a display panel 01, the display panel 01 includes a color film substrate 001 and an array substrate 002 which are oppositely disposed, and a liquid crystal layer 003 located between the color film substrate 001 and the array substrate 002, liquid crystal molecules are in the liquid crystal layer 003, a fingerprint identification unit 04 is disposed on one side of the backlight module 02 far away from the display panel 01, the display panel 01 further includes an upper polarizer 004 located on the color film substrate 001 away from the backlight module 02, a lower polarizer 005 located on the array substrate 002 near the backlight module 02, and a glass cover plate 03 located on one side of a light emitting surface.
The working principle of the fingerprint identification unit 04 is as follows: when a finger is close to or contacts the display screen, the backlight source reflects when irradiating the valley line and the ridge line of the finger fingerprint, because the reflection angles of the valley line and the ridge line and the reflected illumination intensity are different, light is projected onto the fingerprint identification unit 04, and the fingerprint identification unit 04 transmits the received sensing signal to the fingerprint identification signal receiving unit (not shown in the figure) through the fingerprint signal line, so that the fingerprint identification signal receiving unit identifies the valley line and the ridge line of the fingerprint according to the received signal. When the finger 007 approaches or contacts the glass cover plate 03, a series of fingerprint ridges 008 and fingerprint valleys 009 on the skin surface of the finger end form a fingerprint, light emitted by the light source reaches the finger after passing through the lower polarizer 005, the array substrate 002, the liquid crystal layer 003, the color film substrate 001, the upper polarizer 004 and the glass cover plate 03, and then reaches the fingerprint identification unit 04 after being reflected and sequentially passing through the glass cover plate 03, the upper polarizer 004, the color film substrate 001, the liquid crystal layer 003, the array substrate 002, the lower polarizer 005 and the backlight assembly 02.
In fig. 1, since the fingerprint identification unit 04 is disposed on a side of the backlight module 02 far from the display panel 01, holes need to be formed in the backlight module, and the uniformity of the backlight brightness is affected after the holes are formed, that is, no light is emitted at the positions of the holes, so that the non-uniformity needs to be compensated by using a light compensation technique; in addition, because the fingerprint identification unit 04 is disposed on the backlight side, the optical path is far, and in order to improve the accuracy of the fingerprint identification unit 04, an accurate fingerprint image can be obtained only by making a collimation hole, which is complicated to make.
In order to solve the above technical problems, the present invention provides a display panel and a display device, and the following detailed description is provided with respect to embodiments of the display panel and the display device provided by the present invention.
Referring to fig. 2 and 3, fig. 2 is a schematic plan view of a display panel according to the present invention; fig. 3 is a cross-sectional view taken along line a-a' of fig. 2. In fig. 3, the display panel 100 includes a color film substrate 1 and an array substrate 2 which are oppositely disposed, and a liquid crystal layer 3 which is sandwiched between the color film substrate 1 and the array substrate 2, where the liquid crystal layer 3 includes first liquid crystal molecules 31;
the color film substrate 1 comprises a first substrate 11, a black matrix 4 is arranged on one side of the first substrate 11 close to the array substrate 2, and the black matrix 4 comprises a plurality of first openings 41 and a plurality of second openings 42;
a light adjusting layer 5 is arranged on one side of the first substrate 11 far away from the array substrate 2, and the part of the light adjusting layer 5 corresponding to the first opening 41 is used for converging light entering the light adjusting layer 5 from the side of the light adjusting layer 5 far away from the first substrate 11 to the first opening 41;
the array substrate 2 comprises a second substrate 21, wherein a plurality of light sensing elements 6 and a plurality of pixel electrodes 7 are arranged on one side of the second substrate 21 close to the color filter substrate 1, the light sensing elements 6 are arranged corresponding to the first openings 41, and the pixel electrodes 7 are arranged corresponding to the second openings 42;
the light modulation layer 5, the first opening 41, and the light-sensing element 6 at least partially overlap in a direction perpendicular to the first substrate 11.
It is understood that the second opening 42 of the black matrix 4 is a red R, green G or blue B color film, and fig. 3 also shows the cover plate 8, and the cover plate 8 is usually made of glass.
Referring to fig. 3, the color filter substrate 1 further includes a planarization layer 9 on a side thereof adjacent to the array substrate 2 to planarize the surface of the color filter substrate 1, and it is understood that the planarization layer 9 is further filled in the first opening 41 of the black matrix 4, and after the color filter layers 4 and R, G, B are formed to have a certain stack height, the pixel regions are typically planarized by using a topography-following planarization material, where the planarization layer 9 may be a transparent material.
Fig. 2 only shows that the first opening 41 has a rectangular shape, and the first opening 41 may have a circular shape, an oval shape, a diamond shape, or the like, which is not particularly limited herein.
When a finger approaches or contacts the cover plate 8, a series of fingerprint ridges and fingerprint valleys on the skin surface of the finger end form a fingerprint, light emitted by the light source reaches the finger after passing through the liquid crystal layer 3, the color film substrate 1, the light adjusting layer 5 and the glass cover plate 8, and then sequentially passes through the cover plate 03 and the light adjusting layer 5 after being reflected, when the light passes through the adjusting layer 5, the light entering the light adjusting layer 5 from the side of the light adjusting layer 5 away from the first substrate 11 is converged toward the first opening 41 by the part of the light adjusting layer 5 corresponding to the first opening 41, and then reaches the light sensing element 6 through the liquid crystal layer 3, so that the light sensing element 6 recognizes fingerprint characteristics.
Compared with the prior art, the display panel of the embodiment has at least the following beneficial effects:
in the invention, the light sensing element 6 is arranged on the array substrate 2, thus solving the problem of poor backlight brightness uniformity caused by the fact that holes need to be formed on the backlight when the light sensing element is arranged on one side of the backlight;
according to the invention, the part of the light adjusting layer 5 corresponding to the first opening 41 is adopted to converge the light entering the light adjusting layer 5 from the side of the light adjusting layer 5 far away from the first substrate 11 to the first opening 41, so that the reflected light reaching the light sensing element 6 is the fingerprint fragment information to be identified, and the fingerprint information which can cause interference is blocked by the black matrix 4 and can not reach the light sensing element, so that the interference is reduced and the fingerprint identification precision is improved; it should be noted that, since the light adjusting layer 5 can converge the light to the first opening 41, and the collimating holes are not required to be formed, and corresponding film layers are required to be added for forming the collimating holes, the manufacturing process is reduced;
in addition, since the light sensing element 6 is disposed corresponding to the first opening 41, and the pixel electrode 7 is disposed corresponding to the second opening 42, referring to fig. 2, the position corresponding to the second opening 42 is the position of R, G, B color film layer, and the position corresponding to the first opening 41 is the position corresponding to the light sensing element 6, that is, the light sensing element 6 and the pixel electrode 7 are non-overlapped, the light adjusting layer 5 is disposed to converge the light to the first opening 41 for fingerprint identification, and at the same time, the brightness of the display panel is not affected, and the normal display of the display panel is not affected.
Referring to fig. 4, fig. 4 is a cross-sectional view taken along a-a' direction in fig. 2, the light modulation layer 5 includes a plurality of microlenses 51, the microlenses 51 are disposed corresponding to the first openings 41, and curved surfaces of the microlenses 51 are convex toward a side away from the first substrate 11.
Referring to fig. 4, a light adjusting layer 5 is disposed on a side of the first substrate 11 away from the array substrate 2, the light adjusting layer 5 includes a plurality of microlenses 51, and since curved surfaces of the microlenses 51 are protruded toward the side away from the first substrate 11, the microlenses 51 can converge light entering the light adjusting layer 5 from the side of the light adjusting layer 5 away from the first substrate 11 toward the first opening 41; the array substrate 2 comprises a second substrate 21, wherein a plurality of light sensing elements 6 and a plurality of pixel electrodes 7 are arranged on one side of the second substrate 21 close to the color filter substrate 1, the light sensing elements 6 are arranged corresponding to the first openings 41, and the pixel electrodes 7 are arranged corresponding to the second openings 42; the light modulation layer 5, the first opening 41, and the light-sensing element 6 at least partially overlap in a direction perpendicular to the first substrate 11.
The invention realizes the identification of fingerprints under the screen without arranging the light sensing element 6 at one side of the backlight to open holes on the backlight.
Because the micro lens 51 is adopted to converge the light entering the light adjusting layer 5 from the side of the light adjusting layer 5 far away from the first substrate 11 to the first opening 41, the reflected light reaching the light sensing element 6 is the fingerprint segment information to be identified, and the fingerprint information which can cause interference is blocked by the black matrix 4 and can not reach the light sensing element, so that the interference is reduced and the fingerprint identification precision is improved; it should be noted that, since the micro lens 51 can converge the light to the first opening 41, it is not necessary to fabricate the collimating hole, and the fabricating of the collimating hole requires adding a corresponding film layer, the process of the present invention is reduced; in addition, since the light sensing element 6 is disposed corresponding to the first opening 41, the pixel electrode 7 is disposed corresponding to the second opening 42, and the light sensing element 6 and the pixel electrode 7 are not overlapped, the microlens 51 is disposed to focus light toward the first opening 41 for fingerprint identification, and the normal display of the display panel is not affected.
Referring to fig. 5 and 6, fig. 5 is a cross-sectional view taken along the direction B-B 'in fig. 2, in which the second liquid crystal molecules are in the first state, and fig. 6 is a cross-sectional view taken along the direction B-B' in fig. 2, in which the second liquid crystal molecules are in the second state.
The light adjusting layer 5 includes a first electrode layer 52 and a second electrode layer 53, and second liquid crystal molecules 54 interposed between the first electrode layer 52 and the second electrode layer 53;
when fingerprint identification is performed, a voltage difference between the first electrode layer 52 and the second electrode layer 53 forms an electric field for driving the second liquid crystal molecules 54 to deflect, and the electric field is used for adjusting a rotation angle of the second liquid crystal molecules 54 to form the micro lens 51, wherein the micro lens 51 is arranged corresponding to the first opening.
The first electrode layer 52 may be a common electrode layer, and the second electrode layer 53 may be a pixel electrode layer.
In fig. 5, no voltage is applied to the first electrode layer 52 and the second electrode layer 53, so that no electric field is formed at this time, the second liquid crystal molecules 54 are not deflected, and the second liquid crystal molecules 52 are in the first state at this time, and fingerprint recognition is not performed. In fig. 6, a voltage is applied to the first electrode layer 52 and the second electrode layer 53, a voltage difference between the first electrode layer 52 and the second electrode layer 53 forms an electric field for driving the second liquid crystal molecules 54 to deflect, the second liquid crystal molecules 54 deflect to form the micro-lens 51, and at this time, the second liquid crystal molecules 52 are in the second state, and at this time, fingerprint recognition can be performed. The microlens 51 can condense light entering the light adjustment layer 5 from the side of the light adjustment layer 5 away from the first substrate 11 toward the first opening 41.
It can be understood that the array substrate 2 in this embodiment includes a second substrate 21, a plurality of photo sensors 6 and a plurality of pixel electrodes 7 are disposed on one side of the second substrate 21 close to the color filter substrate 1, the photo sensors 6 are disposed corresponding to the first openings 41, and the pixel electrodes 7 are disposed corresponding to the second openings 42; the light modulation layer 5, the first opening 41, and the light-sensing element 6 at least partially overlap in a direction perpendicular to the first substrate 11.
Since the second liquid crystal molecules 54 are not deflected when no voltage is applied to the first electrode layer 52 and the second electrode layer 53, the display effect of the normal display panel is not affected.
In addition, when fingerprint identification is performed, a voltage difference between the first electrode layer 52 and the second electrode layer 53 forms an electric field for driving the second liquid crystal molecules 54 to deflect, the electric field is used for adjusting the rotation angle of the second liquid crystal molecules 54 to form the micro lens 51, the micro lens 51 is arranged corresponding to the first opening, the micro lens 51 is adopted to converge light entering the light adjusting layer 5 from one side, away from the first substrate 11, of the light adjusting layer 5 to the first opening 41, so that reflected light reaching the light sensing element 6 is fingerprint fragment information to be identified, and fingerprint information which can cause interference is blocked by the black matrix 4 and cannot reach the light sensing element, so that the interference is reduced, and the fingerprint identification precision is improved; it should be noted that, since the micro lens 51 can focus the light toward the first opening 41, there is no need to fabricate a collimating hole, and the fabricating of the collimating hole requires the addition of a corresponding film, the present invention reduces the manufacturing process.
With continued reference to fig. 6, a plurality of second electrodes 531 are included in the second electrode layer 53, and the spacing between adjacent second electrodes 531 is greater than the spacing between adjacent pixel electrodes 7.
In fig. 6, the distance between the adjacent second electrodes 531 is a, and the distance between the adjacent pixel electrodes 7 is b, a > b. It can be understood that when no voltage is applied to the second electrode layer 53 and the first electrode layer 52, the second liquid crystal molecules 54 are not deflected, so that the light adjusting layer 5 does not affect the normal display of the display panel when fingerprint recognition is not performed. Since the larger the spacing between the adjacent second electrodes 531, the larger the orthographic projection of the microlens 51 on the second substrate 21 caused by the deflection of the second liquid crystal molecules 54, and the smaller the spacing between the adjacent second electrodes 531, the smaller the orthographic projection of the microlens 51 on the second substrate 21 caused by the deflection of the second liquid crystal molecules 54. When the distance between the adjacent second electrodes 531 is greater than the distance between the adjacent pixel electrodes 7, the orthographic projection of the microlens 51 on the second substrate 21, which is generated by the deflection of the second liquid crystal molecules 54, is relatively large, and the ratio of the luminous flux that can be converged during fingerprint identification is relatively large, that is, the fingerprint that can be identified is relatively large, so that complete fingerprint information can be identified.
With continued reference to fig. 6. The orthographic projection of the micro lens 51 on the plane of the second substrate 21 is overlapped with the orthographic projection of at least one second opening 42 adjacent to the micro lens on the plane of the second substrate 21.
Fig. 6 shows that the orthographic projection of the micro-lens 51 on the plane of the second substrate 21 overlaps with the orthographic projection of the plurality of second openings 42 adjacent to the micro-lens on the plane of the second substrate 21.
It can be understood that when no voltage is provided to the second electrode layer 53 and the first electrode layer 52, and no electric field exists between the two, the second liquid crystal molecules 54 are not deflected, and the second liquid crystal molecules do not form microlenses in the display stage, but only deflect to form microlenses during fingerprint identification, so that the normal display of the display panel is not affected when the orthographic projection of the microlenses 51 on the second substrate 21 caused by the deflection of the second liquid crystal molecules 54 is relatively large. The orthographic projection of the micro lens 51 on the plane of the second substrate 21 is overlapped with the orthographic projection of at least one second opening 42 adjacent to the micro lens 51 on the plane of the second substrate 21, so that the orthographic projection of the micro lens 51 on the second substrate 21 generated by deflection of the second liquid crystal molecules 54 is larger, the light flux ratio capable of converging is larger, namely the fingerprint capable of being identified is larger, complete fingerprint information can be identified, and normal display of the display panel cannot be influenced.
With continued reference to fig. 3, the photosensitive element 6 is located between two adjacent pixel electrodes 7.
Because the light sensing element 6 is disposed corresponding to the first opening 41, the pixel electrode 7 is disposed corresponding to the second opening 42, and the light sensing element 6 is located between two adjacent pixel electrodes 7, that is, the light sensing element 6 and the pixel electrode 7 are not overlapped, the light adjusting layer 5 is disposed to converge the light to the first opening 41 for fingerprint identification, and at the same time, the brightness of the display panel is not affected, and the normal display of the display panel is not affected.
Referring to FIG. 7, FIG. 7 is a further cross-sectional view taken along line A-A' of FIG. 2, and the display panel of FIG. 7 further includes first polarizer 12 and second polarizer 22;
the first polarizer 12 is positioned on one side of the optical adjusting layer 5, which is far away from the color film substrate 1, and the first polarizer 12 is bonded with the optical adjusting layer 5 through a first adhesive layer 13;
the second polarizer 22 is located on the side of the array substrate 2 away from the color filter substrate 1.
Referring to fig. 7, the color filter substrate 1 includes a first substrate 11, a black matrix 4 is disposed on one side of the first substrate 11 close to the array substrate 2, and the black matrix 4 includes a plurality of first openings 41 and a plurality of second openings 42;
a light adjusting layer 5 is arranged on one side of the first substrate 11 far away from the array substrate 2, and the part of the light adjusting layer 5 corresponding to the first opening 41 is used for converging light entering the light adjusting layer 5 from the side of the light adjusting layer 5 far away from the first substrate 11 to the first opening 41;
the array substrate 2 comprises a second substrate 21, wherein a plurality of light sensing elements 6 and a plurality of pixel electrodes 7 are arranged on one side of the second substrate 21 close to the color filter substrate 1, the light sensing elements 6 are arranged corresponding to the first openings 41, and the pixel electrodes 7 are arranged corresponding to the second openings 42;
the light modulation layer 5, the first opening 41, and the light-sensing element 6 at least partially overlap in a direction perpendicular to the first substrate 11.
In this embodiment, when a finger contacts the cover plate 8, a series of fingerprint ridges and fingerprint valleys on the skin surface of the finger end constitute a fingerprint, light emitted from the light source reaches the finger after passing through the second polarizer 22, the array substrate 2, the liquid crystal layer 3, the color film substrate 1, the light adjusting layer 5, the first polarizer 12 and the glass cover plate 8, and then passes through the cover plate 03, the first polarizer 12 and the light adjusting layer 5 in sequence after being reflected, when the light passes through the adjusting layer 5, because a portion of the light adjusting layer 5 corresponding to the first opening 41 converges light entering the light adjusting layer 5 from the side of the light adjusting layer 5 away from the first substrate 11 toward the first opening 41, and reaches the light sensing element 6 through the liquid crystal layer 3 after being converged, the light sensing element 6 recognizes fingerprint characteristics. In the prior art, the light sensing element 6 is disposed on one side of the backlight assembly far away from the display panel, so that the reflected light not only passes through the cover plate 03, the first polarizer 12 and the light adjusting layer 5, but also passes through the second polarizer 22, and the cooperation of the liquid crystal layer 3 is required, so that the reflected light can pass through the second polarizer 22 smoothly, in addition, the reflected light needs to pass through the polarizers twice, and since the light intensity of the reflected light is weakened every time passing through the polarizer, therefore, after the reflected light passes through the second polarizer 22, the light intensity of the reflected light is weakened again, which is not beneficial to accurately identifying the fingerprint information, and the light sensing element 6 is disposed on one side of the second substrate 21 close to the color film substrate 1, so that the problem is solved, and the accuracy of fingerprint identification is improved.
It will be appreciated that the reflected light of the fingerprint features reaches from the first surface 81 of the cover plateTo the light-sensing element 6, the path between this needs to satisfy the formula:
where n1 is the refractive index of the cover plate 8, u is the distance between the first surface 81 and the side of the light adjusting layer 5 close to the first surface 81, n2 is the refractive index of the film layer between the side of the light adjusting layer 5 close to the light sensing element 6 and the light sensing element 6, v is the distance between the side of the light adjusting layer 5 close to the light sensing element 6 and the light sensing element 6, n is the refractive index of the light adjusting layer 5, r1 is the curvature radius of the light adjusting layer 5 close to the cover plate 8, r2 is the curvature radius of the light adjusting layer 5 close to the light sensing element 6, the steeper the curvature radius of the curved surface is, the smoother the larger the curvature radius of the curved surface is, and the larger the curvature radius tends to infinity when the curved surface is flat.
With continued reference to fig. 3, the distance v between the light modulation layer 5 and the black matrix 4 in the direction perpendicular to the first substrate 11 is 150-500 μm; the distance e between the black matrix 4 and the light-sensing element 6 is 3-6 μm.
As can be seen from the above formula, since the refractive indexes n, n1, and n2 are determined, the distance u between the light adjusting layer 5 (the side close to the light sensing element 6) and the black matrix, and the distance e between the black matrix 4 and the light sensing element 6 can determine the radius of curvature of the light adjusting layer 5, but in the present invention, the portion of the light adjusting layer 5 corresponding to the first opening 41 converges the light entering the light adjusting layer 5 from the side of the light adjusting layer 5 away from the first substrate 11 toward the first opening 41, and the light adjusting layer 5 does not affect the normal display of the display panel, so that the radius of curvature is as small as possible, corresponds to the first opening 41, and does not cover the opening area of the display panel. In addition, since v is much larger than e, light in a larger range can be converged at the light sensing element 6, and meanwhile, the area of the light sensing element can be set smaller, thereby reducing the influence on the setting of the pixel electrode.
With reference to fig. 3, the display panel further includes a cover plate 8, the cover plate 8 is located on a side of the color filter substrate 1 away from the array substrate 2, the cover plate 8 includes a first surface 81, the first surface 81 is a side of the cover plate 8 away from the color filter substrate 1, and a distance u between the first surface 81 and the light adjusting layer 5 is 300-.
In the present invention, the closer the cover plate 8 (i.e. finger) is to the light adjusting layer 5, the smaller the curvature radius, and when the distance u between the first surface 81 and the light adjusting layer 5 is 300-.
In the invention, the distance v between the light adjusting layer 5 and the black matrix 4 is 150-500 μm; the distance e between the black matrix 4 and the light sensing element 6 is 3-6 μm, so that the light entering the light adjusting layer 5 from the side of the light adjusting layer 5 away from the first substrate 11 is converged toward the first opening 41 by the portion of the light adjusting layer 5 corresponding to the first opening 41, without affecting normal display.
With continued reference to fig. 3, the maximum width of the first opening 41 in the first direction X is 8-18 μm;
the maximum width of the light-sensing element is 10-20 μm in the first direction X, which is the direction from the first opening 41 to the second opening 42.
It can be understood that the whole area of the black matrix 4 is coated on the first substrate 11, and the main function of the black matrix 4 is to block light to prevent light leakage from the color film layer (R, G, B), so the width of the black matrix 4 is limited and cannot affect the aperture ratio of the display panel, and therefore the requirement of not affecting the aperture ratio of the display panel is required to be satisfied, the first opening 41 is disposed on the black matrix 4, and when the maximum width of the first opening 41 is 8-18 μm, that is, the aperture ratio of the display panel is not affected, the light converged by the light adjusting layer 5 to the first opening 41 and reaches the light sensing element 6 through the first opening 41.
It is necessary for the light-sensing element 6 that the light modulation layer 5, the first opening 41 and the light-sensing element 6 are at least partially overlapped in a direction perpendicular to the first substrate 11, and when the maximum width of the light-sensing element in the first direction X is 10-20 μm, the light-sensing element 6 can completely receive the light passing through the first opening 41, thereby improving the fingerprint recognition accuracy.
Referring to fig. 8, fig. 8 is a further sectional view taken along line a-a' of fig. 2. Fig. 8 also includes: the backlight module 10 is located on one side of the array substrate 2 away from the color film substrate 1.
In the invention, the light-sensitive element 6 is arranged on one side of the second substrate 21 close to the color film substrate 1, and the light-sensitive element 6 is not arranged on one side of the backlight module 10 far away from the color film substrate 1, so that holes do not need to be formed in the backlight module 10, and the problem of poor backlight brightness uniformity in the prior art is solved.
In some optional embodiments, please refer to fig. 9, fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention, and the display device 200 according to the embodiment includes the display panel 100 according to the above embodiments. The display device 200 in the embodiment of fig. 9 is described by taking a mobile phone as an example, but it should be understood that the display device 200 provided in the embodiment of the present invention may be other display devices 200 having a display function, such as a computer, a television, an electronic paper, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device 200 provided in the embodiment of the present invention has the beneficial effects of the display panel 100 provided in the embodiment of the present invention, and specific reference may be made to the specific description of the display panel 100 in the foregoing embodiments, and the detailed description of the embodiment is not repeated herein.
As can be seen from the above embodiments, the display panel and the display device provided by the present invention at least achieve the following advantages:
in the invention, the light sensing element is arranged on the array substrate, so that the problem of poor backlight brightness uniformity caused by the fact that holes need to be formed in the backlight when the light sensing element is arranged on one side of the backlight is solved;
according to the invention, the part of the light adjusting layer corresponding to the first opening is adopted to converge the light entering the light adjusting layer from the side, away from the first substrate, of the light adjusting layer to the first opening, so that the reflected light on the light sensing element is fingerprint fragment information to be identified, and the fingerprint information which can cause interference is blocked by the black matrix and cannot reach the light sensing element, so that the interference is reduced and the fingerprint identification precision is improved; it should be noted that, since the light adjusting layer can converge the light to the first opening, and the collimating hole is not required to be formed, and a corresponding film layer is required to be added for forming the collimating hole, the manufacturing process is reduced;
in addition, because the light sense element is arranged corresponding to the first opening, the pixel electrode is arranged corresponding to the second opening, and the light sense element and the pixel electrode are not overlapped, the light adjusting layer is arranged to enable light to be converged to the first opening for fingerprint identification, and meanwhile, the brightness of the display panel is not influenced, and the normal display of the display panel is not influenced.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (12)
1. The display panel is characterized by comprising a color film substrate, an array substrate and a liquid crystal layer, wherein the color film substrate and the array substrate are arranged oppositely, the liquid crystal layer is clamped between the color film substrate and the array substrate, and the liquid crystal layer comprises first liquid crystal molecules;
the color film substrate comprises a first substrate, a black matrix is arranged on one side of the first substrate, which is close to the array substrate, and the black matrix comprises a plurality of first openings and a plurality of second openings;
a light adjusting layer is arranged on one side, far away from the array substrate, of the first substrate, and the part, corresponding to the first opening, of the light adjusting layer is used for converging light entering the light adjusting layer from one side, far away from the first substrate, of the light adjusting layer to the first opening;
the array substrate comprises a second substrate, wherein one side of the second substrate, which is close to the color film substrate, is provided with a plurality of light sensing elements and a plurality of pixel electrodes, the light sensing elements are arranged corresponding to the first openings, and the pixel electrodes are arranged corresponding to the second openings;
the light adjusting layer, the first opening and the light sensing element are at least partially overlapped in a direction perpendicular to the first substrate;
in a direction perpendicular to the first substrate, the distance between the light adjusting layer and the black matrix is larger than the distance between the black matrix and the light sensing element;
in a first direction, the width of the first opening is smaller than that of the light sensing element, and the first direction is a direction from the first opening to the second opening.
2. The display panel according to claim 1, wherein the light adjustment layer comprises a plurality of microlenses, the microlenses are disposed corresponding to the first openings, and curved surfaces of the microlenses are convex toward a side away from the first substrate.
3. The display panel according to claim 1, wherein the light adjustment layer comprises a first electrode layer and a second electrode layer, and second liquid crystal molecules sandwiched between the first electrode layer and the second electrode layer;
when fingerprint identification is carried out, the voltage difference between the first electrode layer and the second electrode layer forms an electric field for driving the second liquid crystal molecules to deflect, the electric field is used for adjusting the rotation angle of the second liquid crystal molecules to form a micro lens, and the micro lens is arranged corresponding to the first opening.
4. The display panel according to claim 3, wherein the second electrode layer comprises a plurality of second electrodes, and a distance between adjacent second electrodes is larger than a distance between adjacent pixel electrodes.
5. The display panel of claim 3, wherein an orthographic projection of the micro-lens on the plane of the second substrate overlaps with an orthographic projection of at least one adjacent second opening on the plane of the second substrate.
6. The display panel according to claim 1,
the photosensitive element is positioned between two adjacent pixel electrodes.
7. The display panel according to claim 1, further comprising a first polarizing plate and a second polarizing plate;
the first polarizer is positioned on one side of the light adjusting layer, which is far away from the color film substrate, and the first polarizer is bonded with the light adjusting layer through a first adhesive layer;
the second polarizer is located on one side, away from the color film substrate, of the array substrate.
8. The display panel according to claim 1, wherein the distance between the light adjusting layer and the black matrix is 150-500 μm; the distance between the black matrix and the light sensing element is 3-6 μm.
9. The display panel according to claim 8, further comprising:
the cover plate is positioned on one side of the color film substrate, which is far away from the array substrate, the cover plate comprises a first surface, the first surface is the side of the cover plate, which is far away from the color film substrate, and the distance between the first surface and the light adjusting layer is 300-800 mu m.
10. The display panel according to claim 8, wherein the maximum width of the first opening is 8-18 μm; the maximum width of the light-sensing element is 10-20 μm.
11. The display panel according to claim 1, further comprising: and the backlight module is positioned on one side of the array substrate, which is far away from the color film substrate.
12. A display device comprising the display panel according to any one of claims 1 to 11.
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| US20220004734A1 (en) * | 2019-10-09 | 2022-01-06 | Novatek Microelectronics Corp. | Fingerprint recognition apparatus |
| CN110928022B (en) * | 2019-11-26 | 2022-11-08 | 武汉华星光电技术有限公司 | Liquid crystal box and liquid crystal display screen |
| CN111308767B (en) * | 2019-11-27 | 2021-03-16 | 武汉华星光电技术有限公司 | Liquid crystal display module |
| CN110850635B (en) * | 2019-11-28 | 2022-07-29 | 京东方科技集团股份有限公司 | Backlight module, manufacturing method and display device |
| CN110928028A (en) * | 2019-11-29 | 2020-03-27 | 武汉华星光电技术有限公司 | Display panel |
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| CN110928017A (en) * | 2019-12-13 | 2020-03-27 | 武汉华星光电技术有限公司 | Display panel |
| US11429001B2 (en) | 2019-12-13 | 2022-08-30 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Liquid crystal display panel and liquid crystal display device |
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| CN110929699A (en) * | 2019-12-20 | 2020-03-27 | 京东方科技集团股份有限公司 | Display module, fingerprint identification method and preparation method thereof, and display device |
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| CN111766731A (en) * | 2020-07-17 | 2020-10-13 | 武汉华星光电技术有限公司 | Display panel and display device |
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