CN111308755A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN111308755A CN111308755A CN201911265118.6A CN201911265118A CN111308755A CN 111308755 A CN111308755 A CN 111308755A CN 201911265118 A CN201911265118 A CN 201911265118A CN 111308755 A CN111308755 A CN 111308755A
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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
-
- 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
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133512—Light shielding layers, e.g. black matrix
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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
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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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136286—Wiring, e.g. gate line, drain line
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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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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Liquid Crystal (AREA)
Abstract
The embodiment of 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, and the liquid crystal layer is clamped between the color film substrate and the array substrate; the array substrate comprises a first substrate and a fingerprint identification unit; further comprising a first light-shielding layer, a first oxide conductor layer and a second oxide conductor layer; the first oxide conductor layer is positioned on one side of the first shading layer far away from the first substrate; the second oxide conductor layer is positioned on one side of the first oxide conductor layer far away from the first substrate base plate; the fingerprint identification device further comprises a first electrode and a second electrode, wherein the first electrode is positioned on the first oxide conductor layer, the second electrode is positioned on the second oxide conductor layer, and the first electrode and the second electrode surround the fingerprint identification unit; in the fingerprint identification stage, inputting a first voltage signal to the first electrode and inputting a second voltage signal to the second electrode; the first voltage signal and the first voltage signal are unequal. Thereby avoid stray light's interference, improve fingerprint 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 popularization of mobile display products, information security is receiving attention of consumers. Fingerprint identification has uniqueness and is difficult to copy, so the fingerprint identification is widely applied to scenes such as unlocking of mobile display products, payment confirmation and the like. The product based on the optical fingerprint identification technology realizes the reception of different fingerprint information through the reflectivity difference of fingerprint valleys and fingerprint ridges, thereby realizing the fingerprint identification.
Generally, the fingerprint identification units are integrated on the array substrate of the display panel, and each fingerprint identification unit is used for receiving light reflected by a corresponding fingerprint identification area right above the fingerprint identification unit. However, since the light path in the display panel is complicated, when fingerprint recognition is performed, a part of stray light interferes with the fingerprint recognition unit, resulting in low accuracy of fingerprint recognition.
Disclosure of Invention
In view of this, the present invention provides a display panel and a display device, so as to achieve the purposes of improving the fingerprint identification precision and reducing the process preparation difficulty.
In one aspect, the present invention provides a display panel comprising:
the liquid crystal 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 between the color film substrate and the array substrate;
the array substrate comprises a first substrate and a fingerprint identification unit;
further comprising a first light-shielding layer, a first oxide conductor layer and a second oxide conductor layer; the first oxide conductor layer is positioned on one side, far away from the first substrate, of the first shading layer; the second oxide conductor layer is positioned on one side of the first oxide conductor layer, which is far away from the first substrate base plate;
the fingerprint identification device further comprises a first electrode and a second electrode, the first electrode is located on the first oxide conductor layer, the second electrode is located on the second oxide conductor layer, and the first electrode and the second electrode surround the fingerprint identification unit in the direction perpendicular to the plane of the first substrate;
in a fingerprint identification stage, inputting a first voltage signal to the first electrode and inputting a second voltage signal to the second electrode; the first voltage signal and the first voltage signal are unequal.
In another aspect, the present invention also provides a display device, including:
the display panel of the first aspect.
Compared with the prior art, the display panel and the display device provided by the invention have the following beneficial effects that: through setting up first electrode and second electrode, first electrode is located first oxide conductor layer, the second electrode is located the second oxide conductor layer, and in the planar direction in the first substrate base plate place of perpendicular to, first electrode and second electrode all surround the fingerprint identification unit, thereby at the fingerprint identification stage, input first voltage signal to first electrode, input second voltage signal to the second electrode, and first voltage signal are unequal, also be at the peripheral dark state electric field that builds of fingerprint identification unit, block the light of entering to one side through the liquid crystal, in order to avoid the fingerprint identification unit to receive other stray light's interference, thereby improve the fingerprint identification precision. Meanwhile, the first electrode and the second electrode are respectively manufactured by utilizing the first oxide conductor layer and the second oxide conductor layer, so that the process preparation difficulty can be reduced, and the light and thin display panel can be realized.
Drawings
Fig. 1 is a schematic plan view of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the display panel shown in FIG. 1 along section AA;
FIG. 3 is a schematic plan view of another display panel according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of the display panel shown in FIG. 3 along a section BB;
FIG. 5 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the present invention;
fig. 7 is a schematic cross-sectional view illustrating a display panel according to another embodiment of the present invention;
FIG. 8 is a schematic diagram of a planar structure of another display panel according to an embodiment of the present invention;
fig. 9 is a schematic plan view illustrating a display panel according to another embodiment of the present invention;
fig. 10 is a schematic plan view illustrating a display panel according to another embodiment of the present invention;
fig. 11 is a schematic plan view illustrating a display panel according to another embodiment of the present invention;
FIG. 12 is a schematic cross-sectional view of the display panel of FIG. 11 along section CC;
fig. 13 is a schematic plan view illustrating a display panel according to another embodiment of the present invention;
FIG. 14 is a schematic cross-sectional view of the display panel shown in FIG. 13 along section DD;
fig. 15 is a schematic plan view illustrating a display panel according to another embodiment of the present invention;
FIG. 16 is a schematic view of the transmittance and liquid crystal deflection of the display panel of FIG. 15 along section EE;
fig. 17 is a schematic plan view of a display device according to an embodiment of the present invention.
Detailed Description
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. Also, the shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the present invention.
In order to better understand the technical solutions of the present invention, the technical solutions of the present invention are described in detail below with reference to the drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the embodiments of the present invention are detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features in the embodiments and the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic plan view of a display panel according to an embodiment of the present invention, and fig. 2 is a schematic cross-sectional view of the display panel shown in fig. 1 along a cross-section AA. The display panel comprises a color film substrate 20, an array substrate 10 and a liquid crystal layer 30, wherein the color film substrate 20 and the array substrate 10 are arranged oppositely, and the liquid crystal layer is clamped between the color film substrate 20 and the array substrate 10; the array substrate 10 includes a first substrate 101 and a fingerprint identification unit 110; further includes a first light-shielding layer LS, a first oxide conductor layer 41, and a second oxide conductor layer 42; the first oxide conductor layer 41 is located on the side of the first light-shielding layer LS away from the first substrate base 101; the second oxide conductor layer 42 is located on the side of the first oxide conductor layer 41 away from the first substrate base plate 101; the fingerprint identification device further comprises a first electrode 421 and a second electrode 422, wherein the first electrode 421 is located on the first oxide conductor layer 41, the second electrode 422 is located on the second oxide conductor layer 42, and the first electrode 421 and the second electrode 422 both surround the fingerprint identification unit 110 in a direction perpendicular to the plane of the first substrate 101; in the fingerprint identification stage, a first voltage signal is input to the first electrode 421, and a second voltage signal is input to the second electrode 422; the first voltage signal and the first voltage signal are unequal.
Fig. 1 only illustrates a partial structure of the array substrate of the display panel, and fig. 2 only illustrates a partial structure of the display panel along a cross section AA of fig. 1.
It is understood that the first oxide conductor layer 41 and the second oxide conductor layer 42 are transparent electrode layers, such as transparent metal oxide electrode layers of indium tin oxide, antimony tin oxide, and the like, and the invention is not limited thereto.
The fingerprint identification unit 110 is configured to convert the reflected light reflected by the touch subject into a photocurrent, and transmit the photocurrent to a fingerprint identification signal receiving unit (not shown in the figure) through a fingerprint identification signal line (not shown in the figure), where the light irradiates on valleys and ridges of the fingerprint of the finger, and the reflection angles of the valleys and ridges and the intensity of the reflected light are different, so that the fingerprint identification signal receiving unit can identify the valleys and ridges of the fingerprint. Alternatively, the fingerprint recognition unit 110 may include an N-type semiconductor layer, an intrinsic semiconductor layer, and a P-type semiconductor layer sequentially stacked in a direction perpendicular to the plane of the first substrate base 101.
It can be understood that, in the display panel provided in the embodiment of the present invention, the fingerprint identification unit 110 generates different levels of photocurrents under different light intensity irradiation, and the first semiconductor layer 120 can transmit the current signal to the driving chip for processing, so as to obtain corresponding light intensity information. The array substrate 10 further includes a first light-shielding layer LS located between the first substrate 101 and the first semiconductor layer 120, and a buffer layer is disposed between the first light-shielding layer LS and the first semiconductor layer 120. In a direction perpendicular to the plane of the first substrate base 101, the fingerprint identification unit 110 and the first semiconductor layer 120 are both located within the first light shielding layer LS. The first light-shielding layer LS can thus shield light emitted from the light source on the other side of the first substrate base 101 directly toward the first semiconductor layer 120 and the fingerprint recognition unit 110. That is, stray light that cannot reflect fingerprint identification information can be prevented from being emitted to the first semiconductor layer 120 and the fingerprint identification unit 110, so that interference of the stray light on fingerprint identification can be prevented, and the accuracy of fingerprint identification can be improved.
In addition, the display panel further includes an electrode structure 130 electrically connected to the fingerprint identification unit 110 for providing an operating voltage signal to the fingerprint identification unit 110, and the material of the electrode structure 130 may be selected to be a transparent electrode, so that light reflected by the touch object can be incident to the fingerprint identification unit 110. Alternatively, the electrode structure 130 may be located at the first oxide conductor layer 41 or the second oxide conductor layer 42. In fig. 2, only the electrode structure 130 is illustrated as being located on the first oxide conductor layer 41. The advantage of this arrangement is that it can be ensured that the preparation process of the electrode structure 130 matches with that of the existing array substrate, so that the arrangement relationship of the film layer of the array substrate is simple, and the design requirement of the thinned array substrate is easily realized.
In the display panel provided by the present invention, the array substrate 10 generally further includes an insulating layer disposed between adjacent conductive layers, and the insulating layer is an organic insulating layer or an inorganic insulating layer, so as to avoid short circuit. The first light shielding layer LS may be made of a metal material or an organic resin material having a light shielding effect, which is not particularly limited in the present invention.
Specifically, according to the display panel provided by the present invention, the first electrode 421 is disposed on the first oxide conductor layer 41, the second electrode 422 is disposed on the second oxide conductor layer 42, and in a direction perpendicular to the plane of the first substrate 101, the first electrode 421 and the second electrode 422 both surround the fingerprint identification unit 110, so that in the fingerprint identification stage, the first voltage signal is input to the first electrode 421, the second voltage signal is input to the second electrode 422, and the first voltage signal is different from the first voltage signal, that is, a dark-state electric field is established around the fingerprint identification unit 110, and the liquid crystal 30 blocks the oblique light, so as to prevent the fingerprint identification unit 110 from being interfered by other stray light, thereby improving the fingerprint identification accuracy. Meanwhile, the first electrode 421 and the second electrode 422 are respectively manufactured by using the first oxide conductor layer 41 and the second oxide conductor layer 42, so that the difficulty in manufacturing the display panel can be reduced, and the display panel can be thinned.
In some alternative embodiments, referring to fig. 3 and fig. 4, fig. 3 is a schematic plan view of another display panel provided in the embodiment of the present invention, and fig. 4 is a schematic cross-sectional view of the display panel in fig. 3 along a section BB. The first electrode 421 surrounds the fingerprint identification unit 110, and the second electrode 422 surrounds the first electrode 421; alternatively, referring to fig. 1 and 2, the second electrode 422 surrounds the fingerprint recognition unit 110, and the first electrode surrounds the second electrode 422.
Specifically, in the present invention, the second electrode 422 surrounds the first electrode 421, or the first electrode surrounds the second electrode 422, so that a dark-state electric field is established around the fingerprint identification unit, and the liquid crystal retaining wall is used to block the oblique light, so as to prevent the fingerprint identification unit from being interfered by other stray light, thereby improving the fingerprint identification accuracy.
In some alternative embodiments, the first electrode 421 and the second electrode 422 at least partially overlap in a direction perpendicular to the plane of the first substrate base plate 101.
Specifically, in the present invention, the first electrode 421 and the second electrode 422 are at least partially overlapped in the direction perpendicular to the plane of the first substrate 101, so as to construct a dark-state electric field around the fingerprint identification unit, and the liquid crystal retaining wall is used to block the oblique light, so as to prevent the fingerprint identification unit from being interfered by other stray light, thereby improving the fingerprint identification accuracy.
In some optional embodiments, referring to fig. 1 to 6, the array substrate 10 includes a gate metal layer 102 and a source drain metal layer 103, the gate metal layer 102 is located on a side of the first light shielding layer LS away from the first substrate 101, the source drain metal layer 103 is located on a side of the gate metal layer 102 away from the first substrate 101, and the first oxide conductor layer 41 is located on a side of the source drain metal layer 103 away from the first substrate 101; the liquid crystal display panel further comprises a plurality of scanning lines 40 and a plurality of data lines 50, wherein the scanning lines 40 are located on the gate metal layer 102, extend along the first direction X and are arranged along the second direction Y, the data lines 50 are located on the source drain metal layer 103, extend along the second direction Y and are arranged along the first direction X, and the first direction X is intersected with the second direction Y; the scanning lines 40 and the data lines 50 intersect to define a plurality of sub-pixels, and the sub-pixels include pixel electrodes 12 and thin film transistors 140; the thin film transistor 140 includes a gate G, a source S and a drain D, the gate G is located on the gate metal layer 102, and the source S and the drain D are located on the source drain metal layer 103; the array substrate 10 further includes a common electrode 11, the pixel electrode 12 is located on the second oxide conductor layer 42, and the common electrode 11 is located on the first oxide conductor layer 41. Alternatively, as shown in fig. 7, fig. 7 is a schematic cross-sectional structure diagram of another display panel provided in the embodiment of the present invention. The pixel electrode 12 is located on the first oxide conductor layer 41, and the common electrode 11 is located on the second oxide conductor layer 42.
It should be noted that, in a direction perpendicular to the plane of the first substrate 101, the thin film transistor 140 further includes an active layer, the active layer is electrically connected to the source S and the drain D, and the active layer and the first light shielding layer LS at least partially overlap, that is, in the direction perpendicular to the plane of the first substrate 101, the first light shielding layer LS may only need to shield a channel region of the thin film transistor 140 (i.e., an overlapping portion of the active layer and the gate G of the thin film transistor 140). Of course, in order to better block the light emitted from the backlight to the thin film transistor 140 and reduce the leakage current, the first light shielding layer LS may completely cover the active layer in the direction perpendicular to the plane of the first substrate 101. The present invention is not particularly limited in this regard.
In addition, in the drawings provided by the present invention, only one scan line 40 is illustrated, and in fact, a plurality of scan lines 40 extending along the first direction X and arranged along the second direction Y are disposed on the array substrate.
In the present invention, by forming the pixel electrode 12 and the first oxide conductor layer 41 in the same layer, the common electrode 11 and the second oxide conductor layer 42 in the same layer; alternatively, the pixel electrode 12 and the second oxide conductor layer 42 are disposed on the same layer, and the common electrode 11 and the first oxide conductor layer 41 are disposed on the same layer, that is, on the same layer as the first electrode 421 and the second electrode 422 surrounding the fingerprint identification unit, respectively, so that the manufacturing process can be simplified, and the array substrate 10 can be thinned.
It should be noted that, in the following embodiments, only the pixel electrode 12 is located on the second oxide conductor layer 42, the common electrode 11 is located on the first oxide conductor layer 41, and the first electrode 421 surrounds the second electrode 422 as an example for description, and the same structure uses the same reference numerals, and the description is not repeated.
In some alternative embodiments, with continued reference to fig. 1 and 2, the array substrate 10 further includes a first signal line 61 and a second signal line 62 extending along the second direction Y; the first signal line 61 inputs a first voltage signal to the first electrode 421, and the second signal line 62 inputs a second voltage signal to the second electrode 422.
Specifically, the first signal line 61 and the second signal line 62 extend in the second direction Y, that is, the first signal line 61 and the second signal line 62 are disposed parallel to the data line 50. In this way, the first signal line 61 and the second signal line 62 can be disposed on the source-drain metal layer 103, so that the light shielding effect can be achieved only by increasing the width of the black matrix (not shown in the figure) at the position where the color filter substrate 20 is correspondingly disposed with the first signal line 61 and the second signal line 62. The first signal line 61 and the second signal line 62 may be disposed on the gate metal layer 102 or on the same layer as the first light-shielding layer LS (when the first light-shielding layer LS is made of a metal material). Certainly, when the common electrode 11 is reused as a touch electrode, a touch metal layer (not shown in the figure) is usually further disposed on the array substrate 10, and the first signal line 61 and the second signal line 62 may be selectively disposed in the source/drain metal layer 103, the gate metal layer 102, the first light shielding layer LS, or the touch metal layer, so as to further increase the aperture ratio and improve the display effect.
It is understood that, in fig. 1, the first signal line 61 and the second signal line 62 need to be electrically connected to the first electrode 421 and the second electrode 422 respectively through corresponding connection portions extending along the first direction, and the connection portions overlap the data lines 50 in a direction perpendicular to the plane of the first substrate 101, and at the overlapping positions, the connection portions may be arranged in a manner of exchanging lines in different layers so as to avoid short circuits. The invention does not specifically limit which film layer the connecting part passes through for changing the wire, and can be selected according to actual requirements.
It should be noted that, in the present invention, only the signal lines (i.e., the first signal line 61 and the second signal line 62) for supplying the voltage signals to the first electrode 421 and the second electrode 422 are illustrated, and the signal lines and the specific circuits required for fingerprint identification are not illustrated. It is to be understood that the present invention is not particularly limited thereto.
In some alternative embodiments, referring to fig. 8, fig. 8 is a schematic plan view of a display panel according to another embodiment of the present invention. The array substrate further includes a first signal line 61 and a second signal line 62 extending in the first direction X; the first signal line 61 inputs a first voltage signal to the first electrode 421, and the second signal line 62 inputs a second voltage signal to the second electrode 422.
Specifically, the first signal line 61 and the second signal line 62 extend in the first direction X, that is, the first signal line 61 and the second signal line 62 are disposed parallel to the scan line 40. In this way, the first signal line 61 and the second signal line 62 can be disposed on the gate metal layer, so that the shading effect can be achieved only by increasing the width of the black matrix (not shown in the figure) at the position where the color filter substrate 20 is correspondingly disposed with the first signal line 61 and the second signal line 62. The first signal line 61 and the second signal line 62 may be provided in the source/drain metal layer or in the same layer as the first light-shielding layer (when the first light-shielding layer is made of a metal material). Certainly, when the common electrode 11 is reused as a touch electrode, a touch metal layer (not shown in the figure) is usually further disposed on the array substrate 10, and the first signal line 61 and the second signal line 62 may be selectively disposed in the source/drain metal layer, the gate metal layer, the first light shielding layer, or the touch metal layer, so as to further increase the aperture ratio and improve the display effect.
In some alternative embodiments, referring to fig. 10, fig. 10 is a schematic plan view of a display panel according to another embodiment of the present invention. The array substrate further includes a first signal line 61 extending in the first direction X and a second signal line 62 extending in the second direction Y; the first signal line 61 inputs a first voltage signal to the first electrode 421, and the second signal line 62 inputs a second voltage signal to the second electrode 422. Alternatively, referring to fig. 10, fig. 10 is a schematic plan view of a display panel according to another embodiment of the present invention. The first signal line 61 inputs the second voltage signal to the second electrode 422, and the second signal line 62 inputs the first voltage signal to the first electrode 421.
Specifically, in the present embodiment, the second signal lines 62 are arranged in parallel to the gate lines by arranging the signal lines for transmitting the voltage signals in the first direction X and the second direction Y, respectively, that is, the first signal lines 61 are arranged in parallel to the scanning lines 40. Furthermore, the first signal line 61 may be located on the source-drain metal layer or the touch metal layer, so as to increase the opening of the pixel along the second direction Y; the second signal line 62 is located on the gate metal layer or the touch metal layer, so as to increase the opening of the pixel along the first direction X. Therefore, the arrangement of the signal lines is optimized, the aperture opening ratio of the display panel is improved, the display effect is improved, and the user experience is enhanced.
In some alternative embodiments, referring to fig. 11 and 12, fig. 11 is a schematic plan view of a display panel provided in an embodiment of the present invention, and fig. 12 is a schematic cross-sectional view of the display panel in fig. 11 along a section CC. The array substrate 10 further includes at least one third electrode 423, the third electrode 423 is located on the first oxide conductor layer 41; the third electrode 423 is electrically connected with the first electrode 421, and the third electrode 423 surrounds the fingerprint identification unit 110 in a direction perpendicular to the plane of the first substrate 101; alternatively, referring to fig. 13 and fig. 14, fig. 13 is a schematic plan view of another display panel provided in an embodiment of the present invention, and fig. 14 is a schematic cross-sectional view of the display panel in fig. 13 along a section DD. The array substrate 10 further includes at least one fourth electrode 424, the fourth electrode 424 is located on the second oxide conductor layer 42; the fourth electrode 424 and the second electrode 422 are electrically connected, and the fourth electrode 424 surrounds the fingerprint identification unit 110 in a direction perpendicular to the plane of the first substrate 104.
Of course, the array substrate 10 may include both the third electrode 423 and the fourth electrode 424, so as to further implement the construction of the liquid crystal barriers around the fingerprint identification unit 110, and the present invention will not be described in detail.
Specifically, in the embodiment of the present invention, the third electrode 423 electrically connected to the first electrode 421 and/or the fourth electrode 424 electrically connected to the second electrode 422 are further disposed, so that a dark-state electric field with a larger width is formed around the fingerprint identification unit, and the liquid crystal retaining wall blocks oblique light, so as to further prevent the fingerprint identification unit from being interfered by other stray light, thereby improving the fingerprint identification accuracy.
Fig. 11 and 13 only show a partial structure of the display panel on one side of the array substrate, and mainly refer to the fingerprint identification unit 110 and electrodes for controlling liquid crystal deflection around the fingerprint identification unit, such as the first electrode 421, the second electrode 422, the third electrode 423, and the fourth electrode 424.
In some alternative embodiments, the electrode structure around the fingerprint identification unit may also be as shown in fig. 15, and fig. 15 is a schematic plan structure diagram of another display panel provided in the embodiment of the present invention. The first electrode 421 surrounds the second electrode 422, the fourth electrode 424 surrounds the first electrode 421, the first electrode 421 is designed in a shape of a Chinese character 'gong' on two sides of the fingerprint identification unit 110 parallel to the second direction Y, and the second electrode 422 and the fourth electrode 424 are provided with a plurality of convex parts on two sides of the fingerprint identification unit 110 parallel to the second direction Y. The electrode is in a bow shape and the convex part is designed, a dark electric field with large width can be constructed at the periphery of the fingerprint identification unit, and the liquid crystal retaining wall is used for blocking oblique light so as to prevent the fingerprint identification unit from being interfered by other stray light and improve fingerprint identification accuracy.
The following explains the problems of the arrangement of the peripheral electrodes of the fingerprint identification unit and the liquid crystal deflection and transmittance with reference to fig. 16.
The ffs (fringe Filed switching) technology is a technology that an edge power plant is generated between a pixel electrode and a common electrode which are arranged in different layers on an array substrate, so that liquid crystal molecules between the electrodes and right above the electrodes can rotate on a plane parallel to a substrate base plate, and has high transmittance. The display panel provided by the invention adopts an FFS mode for displaying.
The abscissa in fig. 16 is the distance from the leftmost fourth electrode 424 to the rightmost fourth electrode 424 along the first direction X in fig. 15, and the transmittance is analyzed at a length of 12um in the present invention; the ordinate is the transmittance at the position corresponding to the tangent plane. In addition, the lower half of fig. 16 is a case of liquid crystal deflection at a position corresponding to the tangent plane. The light transmittance in fig. 16 is only a light ray condition before the simulated light ray passes through the color filter substrate. As can be seen from fig. 16, after the first voltage signal and the second voltage signal are respectively applied to the first electrode and the second electrode (the second electrode and the fourth electrode are electrically connected), the light transmittances of the left and right sides of the fingerprint identification unit are low, so that the liquid crystal at the corresponding position acts as a retaining wall, and the interference of the surrounding stray light can be blocked. Meanwhile, the light transmittance of the position above the corresponding fingerprint identification unit is high, so that light reflected back by the touch main body can enter the fingerprint identification unit.
In some optional embodiments, a voltage difference between the first voltage signal and the second voltage signal is greater than or equal to 5V. Specifically, by setting the difference between the first voltage signal and the second voltage signal to be greater than or equal to 5V, it is ensured that liquid crystal molecules around the fingerprint identification unit are deflected (further erected, that is, deflected in the thickness direction of the display panel), thereby functioning as a retaining wall and avoiding interference of surrounding stray light. It is understood that the first voltage signal may be 0V and the second voltage signal may be 5V.
It should be noted that, in the display panel provided by the present invention, since signals with different potentials are applied through the first electrode and the second electrode, the liquid crystal deflection is controlled, a dark state electric field is established around the fingerprint identification unit, and oblique light is blocked by the liquid crystal, so as to prevent the fingerprint identification unit from being interfered by other stray light. In addition, this mode intersects in the mode that current set up the collimation hole around fingerprint identification unit (the collimation hole has higher thickness and width usually to lead to the liquid crystal box thickness inconsistent), can ensure display panel's display effect, promote user experience.
Based on the same inventive concept, the present application further provides a display device, which includes the display panel provided in any of the above embodiments of the present application, with reference to fig. 17. It can be understood that the display device further includes a backlight module (not shown), and the display panel is located on the light-emitting surface of the backlight module. Backlight unit provides the light source for showing, can also provide the required light source of fingerprint identification simultaneously. For the embodiments of the display device provided in the embodiments of the present application, reference may be made to the embodiments of the display panel, and repeated descriptions are omitted. The display device provided by the application can be: any product or component with display and fingerprint identification functions, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a vehicle-mounted navigator and the like.
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: through setting up first electrode and second electrode, first electrode is located first oxide conductor layer, the second electrode is located the second oxide conductor layer, and in the planar direction in the first substrate base plate place of perpendicular to, first electrode and second electrode all surround the fingerprint identification unit, thereby at the fingerprint identification stage, input first voltage signal to first electrode, input second voltage signal to the second electrode, and first voltage signal are unequal, also be at the peripheral dark state electric field that builds of fingerprint identification unit, block the light of entering to one side through the liquid crystal, in order to avoid the fingerprint identification unit to receive other stray light's interference, thereby improve the fingerprint identification precision. Meanwhile, the first electrode and the second electrode are respectively manufactured by utilizing the first oxide conductor layer and the second oxide conductor layer, so that the process preparation difficulty can be reduced, and the light and thin display panel can be realized.
The display panel and the display device provided by the embodiment of the invention are described in detail, and the principle and the embodiment of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A display panel, comprising:
the liquid crystal 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 between the color film substrate and the array substrate;
the array substrate comprises a first substrate and a fingerprint identification unit;
further comprising a first light-shielding layer, a first oxide conductor layer and a second oxide conductor layer; the first oxide conductor layer is positioned on one side, far away from the first substrate, of the first shading layer; the second oxide conductor layer is positioned on one side of the first oxide conductor layer, which is far away from the first substrate base plate;
the fingerprint identification device further comprises a first electrode and a second electrode, the first electrode is located on the first oxide conductor layer, the second electrode is located on the second oxide conductor layer, and the first electrode and the second electrode surround the fingerprint identification unit in the direction perpendicular to the plane of the first substrate;
in a fingerprint identification stage, inputting a first voltage signal to the first electrode and inputting a second voltage signal to the second electrode; the first voltage signal and the first voltage signal are unequal.
2. The display panel according to claim 1, wherein the first electrode surrounds the fingerprint recognition unit, and the second electrode surrounds the first electrode;
or, the second electrode surrounds the fingerprint identification unit, and the first electrode surrounds the second electrode.
3. The display panel according to claim 1, wherein the first electrode and the second electrode at least partially overlap in a direction perpendicular to a plane in which the first substrate base plate is located.
4. The display panel according to claim 1,
the array substrate comprises a grid metal layer and a source drain metal layer, the grid metal layer is positioned on one side, away from the first substrate, of the first shading layer, the source drain metal layer is positioned on one side, away from the first substrate, of the grid metal layer, and the first oxide conductor layer is positioned on one side, away from the first substrate, of the source drain metal layer;
the gate structure further comprises a plurality of scanning lines and a plurality of data lines, wherein the scanning lines are located on the gate metal layer, extend along a first direction and are arranged along a second direction, the data lines are located on the source drain metal layer, extend along the second direction and are arranged along the first direction, and the first direction and the second direction are crossed;
the scanning lines and the data lines are crossed to define a plurality of sub-pixels, and each sub-pixel comprises a pixel electrode and a thin film transistor; the thin film transistor comprises a grid electrode, a source electrode and a drain electrode, wherein the grid electrode is positioned on the grid electrode metal layer, and the source electrode and the drain electrode are positioned on the source drain electrode metal layer;
the array substrate further comprises a common electrode, the pixel electrode is located on the first oxide conductor layer, and the common electrode is located on the second oxide conductor layer; or, the pixel electrode is located on the second oxide conductor layer, and the common electrode is located on the first oxide conductor layer.
5. The display panel according to claim 4, wherein the array substrate further comprises first and second signal lines extending in a first direction;
the first signal line inputs a first voltage signal to the first electrode, and the second signal line inputs a second voltage signal to the second electrode.
6. The display panel according to claim 4, wherein the array substrate further comprises a first signal line and a second signal line extending in a second direction;
the first signal line inputs a first voltage signal to the first electrode, and the second signal line inputs a second voltage signal to the second electrode.
7. The display panel according to claim 4, wherein the array substrate further comprises a first signal line extending in a first direction and a second signal line extending in a second direction;
the first signal line inputs a first voltage signal to the first electrode, and the second signal line inputs a second voltage signal to the second electrode; or, the first signal line inputs a second voltage signal to the second electrode, and the second signal line inputs a first voltage signal to the first electrode.
8. The display panel according to claim 1, wherein a voltage difference between the first voltage signal and the second voltage signal is equal to or greater than 5V.
9. The display panel according to claim 1,
the array substrate further comprises at least one third electrode, and the third electrode is located on the first oxide conductor layer; the third electrode is electrically connected with the first electrode, and the third electrode surrounds the fingerprint identification unit in the direction perpendicular to the plane of the first substrate base plate;
and/or the array substrate further comprises at least one fourth electrode, and the fourth electrode is positioned on the second oxide conductor layer; the fourth electrode is electrically connected with the second electrode, and the fourth electrode surrounds the fingerprint identification unit in the direction perpendicular to the plane where the first substrate base plate is located.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.
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| CN111308755B (en) | 2022-06-14 |
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