CN112946945A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN112946945A CN112946945A CN202011633903.5A CN202011633903A CN112946945A CN 112946945 A CN112946945 A CN 112946945A CN 202011633903 A CN202011633903 A CN 202011633903A CN 112946945 A CN112946945 A CN 112946945A
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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
- G02F1/133509—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
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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- 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
- 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
Abstract
The application discloses a display panel and a display device, which comprise a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate and the second substrate are oppositely arranged; a black matrix layer is arranged on one side, close to the second substrate, of the first substrate, and a first opening region is formed in the black matrix layer; the position on the second substrate corresponding to the first opening area is provided with a fingerprint identification unit, the fingerprint identification unit comprises a liquid crystal regulation and control unit, and the liquid crystal regulation and control unit is used for adjusting the deflection direction of liquid crystal in the first opening area when the display panel normally displays. The liquid crystal regulating and controlling unit is arranged in the first substrate of the display panel, the black matrix layer is arranged on the second substrate, and a first opening area is formed on the black matrix layer at the position corresponding to the liquid crystal regulating and controlling unit; when the liquid crystal display panel normally displays, the liquid crystal regulation and control unit controls the deflection direction of the liquid crystal corresponding to the first opening area, so that the direction of light rays at the first opening area is controlled, and the light rays are prevented from leaking from the first opening area.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel and a display device.
Background
Fingerprint identification technology has been widely applied to small and medium-sized panels, and mainly includes capacitive type, ultrasonic type, and optical type. The optical fingerprint identification technology utilizes the refraction and reflection principle of light, and when light irradiates to a finger, the light is reflected to a photosensitive sensor by the finger, and because the reflection of the light by the fingerprint valley and the fingerprint ridge is different, the reflected light intensity of the valley and the ridge received by the sensor is different, and then the light signal is converted into an electrical signal.
In order to reduce the thickness of a Liquid Crystal Display (LCD) screen, an optical fingerprint recognition unit is generally integrated on a first substrate of a Display panel, and a black matrix layer of each fingerprint recognition unit corresponding to a second substrate needs to be opened to receive light reflected by a fingerprint recognition area directly above the fingerprint recognition unit.
Disclosure of Invention
The embodiment of the application provides a display panel and a display device, and aims to solve the problem that the display panel in the prior art leaks light when fingerprint identification is carried out.
In a first aspect, an embodiment of the present application provides a display panel, which includes a first substrate and a second substrate that are oppositely disposed, and a liquid crystal layer disposed between the first substrate and the second substrate;
a black matrix layer is arranged on one side, close to the second substrate, of the first substrate, and a first opening region is formed in the black matrix layer;
a fingerprint identification unit is arranged on the second substrate corresponding to the first opening area and comprises a liquid crystal regulation and control unit, and the liquid crystal regulation and control unit is used for regulating the deflection direction of the liquid crystal in the first opening area when the display panel normally displays.
Further, the liquid crystal regulating unit comprises a first electrode layer and a second electrode layer which are oppositely arranged, and the liquid crystal regulating unit further comprises an insulating layer arranged between the first electrode layer and the second electrode layer.
Further, the first electrode layer is a common electrode layer, and the second electrode layer is a pixel electrode layer.
Further, the fingerprint identification unit further includes:
a glass substrate;
a buffer layer disposed over the glass substrate;
an amorphous silicon layer disposed over the buffer layer;
the grid insulating layer is arranged above the amorphous silicon layer, a second opening region is formed on the grid insulating layer, and a position, corresponding to the second opening region, on the amorphous silicon layer is exposed;
the photosensitive layer is arranged in the second opening area, and the liquid crystal regulation and control unit is arranged above the photosensitive layer.
Furthermore, the display panel further comprises a backlight module, the backlight module is arranged below the glass substrate, and a light shielding layer is further arranged in the buffer layer and in the area corresponding to the fingerprint identification unit.
Furthermore, the display panel further comprises a thin film transistor, and the thin film transistor and the liquid crystal regulation and control unit are independent from each other.
In a second aspect, embodiments of the present application further provide a display device, including the display panel as described in any one of the above, the display panel including a first substrate and a second substrate which are oppositely disposed, and a liquid crystal layer disposed between the first substrate and the second substrate;
a black matrix layer is arranged on one side, close to the second substrate, of the first substrate, and a first opening region is formed in the black matrix layer;
a fingerprint identification unit is arranged on the second substrate at a position corresponding to the first opening area, the fingerprint identification unit comprises a liquid crystal regulation and control unit, and the liquid crystal regulation and control unit is used for adjusting the deflection direction of the liquid crystal in the first opening area when the display panel normally displays.
Further, the liquid crystal regulating unit comprises a first electrode layer and a second electrode layer which are oppositely arranged, and the liquid crystal regulating unit further comprises an insulating layer arranged between the first electrode layer and the second electrode layer.
Further, the first electrode layer is a common electrode layer, and the second electrode layer is a pixel electrode layer.
The display panel provided by the embodiment of the application comprises a second substrate, a first substrate and a liquid crystal layer, wherein the second substrate and the first substrate are oppositely arranged, the liquid crystal layer is arranged between the second substrate and the first substrate, a liquid crystal regulation and control unit is arranged in the first substrate, a black matrix layer is arranged on the second substrate, and a first opening region is formed in the position, corresponding to the liquid crystal regulation and control unit, on the black matrix layer; when the display panel needs to normally display, the liquid crystal deflection direction corresponding to the first opening region is controlled by the liquid crystal regulation and control unit, so that the direction of light rays at the first opening region is controlled, and the light rays are prevented from leaking from the first opening region.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an embodiment of a display panel according to the present application;
fig. 2 is a schematic structural diagram of another embodiment of a display panel according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The liquid crystal display panel changes the arrangement direction of liquid crystal molecules under the action of an electric field, so that the light transmittance of a light source is changed; and finally realizing picture display by utilizing different excitations of the three primary color signals. Specifically, the liquid crystal can be placed between two pieces of conductive glass, and the electric field effect of twisted nematic liquid crystal molecules is caused by the driving of the electric field between the two electrodes, so that the transmission or shielding function of the light source is controlled, and light and shade are generated between the power switches to display images. That is, in the prior art, if a normal display is desired, an electric field needs to be applied to the liquid crystal, so that the direction of the liquid crystal is deflected, light passes through the liquid crystal, and image display is further achieved.
The embodiments of the present application provide a display panel and a display device, which are described below.
Fig. 1 is a schematic structural diagram of an embodiment of a display panel according to the present application. The display panel comprises a first substrate 11 and a second substrate 12 which are oppositely arranged, and a liquid crystal layer 13 arranged between the first substrate 11 and the second substrate 12. The black matrix layer 14 is disposed on the first substrate 11 at a side close to the second substrate 12, and the first opening region 141 is further formed on the black matrix layer 14.
The fingerprint recognition unit 15 is disposed on the second substrate 12 corresponding to the first opening region 141, the fingerprint recognition unit includes a liquid crystal regulation and control unit 16, the liquid crystal regulation and control unit 16 is also disposed corresponding to the first opening region 141, and the liquid crystal regulation and control unit 16 is configured to adjust a deflection direction of liquid crystal in the first opening region 141 when the display panel normally displays, so that light cannot be emitted from the first opening region 141, and a light leakage phenomenon of the display panel during normal display is avoided.
The display panel provided by the embodiment of the application comprises a second substrate, a first substrate and a liquid crystal layer, wherein the second substrate and the first substrate are oppositely arranged, the liquid crystal layer is arranged between the second substrate and the first substrate, a liquid crystal regulation and control unit is arranged in the first substrate, a black matrix layer is arranged on the second substrate, and a first opening region is formed in the position, corresponding to the liquid crystal regulation and control unit, on the black matrix layer; when the display panel needs to normally display, the liquid crystal deflection direction corresponding to the first opening region is controlled by the liquid crystal regulation and control unit, so that the direction of light rays at the first opening region is controlled, and the light rays are prevented from leaking from the first opening region.
In the display panel shown in fig. 1, when the display panel normally displays, light leakage easily occurs at the first opening region 141, and therefore, the liquid crystal control unit 16 is used to independently control the deflection direction of the liquid crystal at the first opening region 141, so that light cannot pass through the liquid crystal, and the light leakage problem is avoided. When the display panel needs to perform fingerprint identification, the liquid crystal control unit 16 can be used again to control the deflection direction of the liquid crystal in the first opening region 141, so that light can normally pass through the liquid crystal and reach the fingerprint identification unit for fingerprint identification.
Fig. 2 is a schematic structural diagram of another embodiment of a display panel according to the embodiment of the present application. In some embodiments of the present disclosure, the first substrate 11 may be a color filter substrate, and the first substrate 11 may further include a polarizer and a glass substrate disposed above the black matrix layer 14.
And the second substrate 12 may be an array substrate including a fingerprint identification unit 15 and a thin film transistor 17; the fingerprint recognition unit 15 is used for fingerprint recognition, and the thin film transistor 17 is mainly used for normal display.
As shown in fig. 2, the array substrate 12 may include a plurality of film layer structures disposed in a stack. Wherein, the array substrate 12 may include a glass substrate; the buffer layer is arranged above the glass substrate; the amorphous silicon layer is arranged above the buffer layer; a gate insulating layer is formed on the amorphous silicon layer, and a second opening region is formed on the gate insulating layer, so that the amorphous silicon layer is exposed at a position corresponding to the second opening region, that is, the gate insulating layer does not completely cover the amorphous silicon layer.
It should be noted that, in the embodiment of the present application, the fingerprint identification unit 15 and the thin film transistor 17 each include the above-mentioned film layer structure; namely, the fingerprint identification unit 15 and the thin film transistor 17 each include a glass substrate; the buffer layer is arranged above the glass substrate; the amorphous silicon layer is arranged above the buffer layer; and a gate insulating layer is formed over the amorphous silicon layer.
Referring to fig. 2, a second opening region is formed in the gate insulating layer in the fingerprint identification unit 15, such that a portion of the amorphous silicon layer is exposed; and the gate insulating layer completely covers the amorphous silicon layer in the thin film transistor 17. Meanwhile, the fingerprint identification unit 15 further includes a photosensitive layer 18, the photosensitive layer 18 is disposed in the second opening region, and the liquid crystal regulation unit 16 is disposed above the photosensitive layer 18.
In an embodiment of the present application, the liquid crystal cell 16 may include a first electrode layer 161 and a second electrode layer 162 that are oppositely disposed, and further include an insulating layer disposed between the first electrode layer 161 and the second electrode layer 162. As shown in fig. 2, the fingerprint identification unit 15 includes the liquid crystal adjustment unit 16, that is, the fingerprint identification unit 15 itself includes an electrode layer, but the display panel provided in the embodiment of the present application adds an electrode layer on the basis of the original fingerprint identification unit 15 to form a first electrode layer 161 and a second electrode layer 162 that are oppositely disposed, so as to form the liquid crystal adjustment unit.
In the display panel shown in fig. 2, a gate electrode is also formed above the gate insulating layer, including the gate electrode in the fingerprint identification unit 14 and the gate electrode in the thin film transistor 17. And the photosensitive layer 18 in the fingerprint identification unit 15 is disposed at the second opening region on the gate insulating layer, and the upper surface of the photosensitive layer 18 may be parallel to the upper surface of the gate insulating layer to ensure the flatness of the display panel.
In the display panel shown in fig. 2, the photosensitive layer 18 may be a stacked multilayer structure, and is mainly used for sensing light reflected by a finger when the display panel performs fingerprint identification, and further converting an optical signal into an electrical signal to realize fingerprint identification.
In the above embodiment, an interlayer dielectric layer is further disposed above the gate layer and the photosensitive layer, and the interlayer dielectric layer is also an insulating layer; in the embodiments of the present disclosure, the interlayer dielectric layer mainly isolates the gate layer from other layers, thereby preventing the gate layer from being conducted with other layers. The interlayer dielectric layer can be made of silicon dioxide material with a dielectric constant of 3.9-4.0.
Meanwhile, a plurality of third opening areas are formed on the interlayer dielectric layer, and the third opening areas penetrate through the interlayer dielectric layer and the grid insulation layer, so that part of the amorphous silicon layer is exposed. And forming an active drain layer above the third opening region and the interlayer dielectric layer, wherein the source drain layer is connected with part of the amorphous silicon layer by using the third opening region.
It should be noted that, in the embodiment of the present application, the fingerprint identification unit 15 and the thin film transistor 17 both include a source drain layer, and the source drain layer is connected to a portion of the amorphous silicon layer through the third opening region.
As shown in fig. 2, the display panel further includes a passivation layer disposed above the source and drain layers, and a fourth opening region is formed on the passivation layer in a region corresponding to the photosensitive layer 18. The fourth opening region penetrates the passivation layer and a portion of the interlayer dielectric layer, so that a portion of the photosensitive layer 18 is exposed. And a fourth opening region is also formed on the passivation layer at the thin film transistor 17, but the fourth opening region in the thin film transistor 17 is formed above the source and drain layers of the thin film transistor 17 so that a portion of the source and drain layers is exposed.
Referring to fig. 2, a fourth opening area is formed on the passivation layer in the fingerprint identification unit 15 in fig. 2, such that a portion of the photosensitive layer 18 is exposed, and a first electrode layer is formed on the fourth opening area and a portion of the surface of the passivation layer near the fourth opening area, the first electrode layer covers an inner side of the fourth opening area, and a portion of the surface of the passivation layer near the fourth opening area.
The first electrode layer 161 is also included in the thin film transistor 17, but the first electrode layer 161 in the thin film transistor 17 is not located in the fourth opening region, and is located only above the passivation layer.
In the above embodiment, above the first electrode layer 161 and the passivation layer, the display panel is further provided with a planarization layer, the upper surface of the planarization layer is flat to ensure that the upper surface of the array substrate 12 is flat, and the planarization layer may be a multi-layer structure arranged in a stacked manner to further ensure that the upper surface of the array substrate 12 is flat.
However, in the embodiment of the present application, the fingerprint identification unit 15 further includes a liquid crystal regulation unit 16, and the liquid crystal regulation unit 16 may include a first electrode layer 161 and a second electrode layer 162 that are oppositely disposed. Therefore, a second electrode layer 162 is formed over the first electrode layer 161; and a planarization layer is further formed between the first electrode layer 161 and the second electrode layer 162.
That is, in the embodiment of the present application, after the planarization layer is prepared, the passivation layer is filled in the fourth opening region, except for the first electrode layer 161, but in order to prepare and form the liquid crystal adjusting unit 16, an opening process needs to be performed on the planarization layer, and a fifth opening region is formed on the planarization layer and at a position corresponding to the fourth opening region. And the second electrode layer 162 is prepared in the fifth opening region, the second electrode layer 162 is also formed over a portion of the planarization layer.
Referring to fig. 2, the first electrode layer 161 and the second electrode layer 162 are disposed opposite to each other, the first electrode layer 161 may be directly connected to the photosensitive layer 18, and a portion of the second electrode layer 162 is disposed above the planarization layer and directly contacts the liquid crystal layer. A liquid crystal regulation unit is formed among the first electrode layer 161, the second electrode layer 162 and the passivation layer; that is, the insulating layer disposed between the first electrode layer 161 and the second electrode layer 162 may be a planarization layer.
In the thin film transistor 17, the first electrode layer 161 and the second electrode layer 162 are also included in the thin film transistor 17, but the first electrode layer 161 in the thin film transistor 17 is not provided in the fourth opening region, and the second electrode layer 162 is completely filled in the fourth opening region in the thin film transistor 17, and a part of the second electrode layer 162 is also provided on the planarization layer.
Note that, in the embodiment of the present application, the planarization layer completely covers the fingerprint identification unit 15 and the first electrode layer 161 in the thin film transistor 17, and the fingerprint identification unit 15 and a part of the second electrode layer 162 in the thin film transistor 17 are disposed above the planarization layer.
In the embodiment of the present application, the first electrode layer 161 may be a common electrode layer, and the second electrode layer 162 is a pixel electrode layer, so that the liquid crystal regulating unit 16 has a structure including the common electrode layer, the planarization layer and the pixel electrode layer from top to bottom. Since the thin film transistor 17 also includes the pixel electrode layer and the common electrode layer, when the liquid crystal regulation unit 16 is prepared, the same preparation method can be used to simultaneously prepare the pixel electrode layers in the liquid crystal regulation unit and the thin film transistor 17, and then prepare the common electrode layer, so that an additional manufacturing process is not needed, and manpower and material resources are saved.
In other embodiments of the present disclosure, the first electrode layer 161 may also be a pixel electrode layer, and the second electrode layer 162 is a common electrode layer, and the liquid crystal cell 16 includes a pixel electrode layer, a planarization layer, and a common electrode layer in sequence from top to bottom. That is, in the embodiment of the present application, the positional relationship between the first electrode layer 161 and the second electrode layer 162 in the liquid crystal regulating unit 16 is not fixed only.
In the embodiment of the present application, the liquid crystal adjusting unit 16 and the thin film transistor 17 are independent from each other. That is, the liquid crystal regulating unit 16 controls only the deflection direction of the liquid crystal at the first opening region 141; and the thin film transistor controls only the deflection direction of the liquid crystal in the other regions except for the first opening region 141. When the display panel normally displays a picture, the liquid crystal adjusting and controlling unit 16 can control the deflection of the liquid crystal at the first opening region 141, so that the light cannot be transmitted after the liquid crystal at the first opening region 141 is deflected, thereby avoiding light leakage. When the display panel needs to perform fingerprint identification, the liquid crystal control unit 16 may control the liquid crystal in the first opening region 141 to deflect until the liquid crystal is in the same direction as the liquid crystal in the other regions except the first opening region 141, and at this time, light may normally pass through the first opening region 141, so as to implement fingerprint identification.
In the embodiment of the present application, the display panel further includes a backlight module, the backlight module is disposed below the glass substrate, and a light shielding layer is further disposed in the buffer layer and in a region corresponding to the fingerprint identification unit 15. The shading layer can shelter from the light from backlight unit, and the light of avoiding backlight unit causes the influence to fingerprint identification.
The present application further provides a display device, which includes the display panel as described in any one of the above, where as shown in fig. 1, a schematic structural diagram of an embodiment of the display panel provided in the embodiment of the present application is shown. The display panel comprises a first substrate 11 and a second substrate 12 which are oppositely arranged, and a liquid crystal layer 13 arranged between the first substrate 11 and the second substrate 12. The black matrix layer 14 is disposed on the first substrate 11 at a side close to the second substrate 12, and the first opening region 141 is further formed on the black matrix layer 14.
The fingerprint recognition unit 15 is disposed on the second substrate 12 corresponding to the first opening region 141, the fingerprint recognition unit includes a liquid crystal regulation and control unit 16, the liquid crystal regulation and control unit 16 is also disposed corresponding to the first opening region 141, and the liquid crystal regulation and control unit 16 is configured to adjust a deflection direction of liquid crystal in the first opening region 141 when the display panel normally displays, so that light cannot be emitted from the first opening region 141, and a light leakage phenomenon of the display panel during normal display is avoided.
The display device provided by the embodiment of the application comprises a second substrate, a first substrate and a liquid crystal layer, wherein the second substrate and the first substrate are oppositely arranged, the liquid crystal layer is arranged between the second substrate and the first substrate, a liquid crystal regulation and control unit is arranged in the first substrate, a black matrix layer is arranged on the second substrate, and a first opening region is formed in the position, corresponding to the liquid crystal regulation and control unit, of the black matrix layer; when the display panel needs to normally display, the liquid crystal deflection direction corresponding to the first opening region is controlled by the liquid crystal regulation and control unit, so that the direction of light rays at the first opening region is controlled, and the light rays are prevented from leaking from the first opening region.
In the display panel shown in fig. 1, when the display panel normally displays, light leakage easily occurs at the first opening region 141, and therefore, the liquid crystal control unit 16 is used to independently control the deflection direction of the liquid crystal at the first opening region 141, so that light cannot pass through the liquid crystal, and the light leakage problem is avoided. When the display panel needs to perform fingerprint identification, the liquid crystal control unit 16 may be used again to control the deflection direction of the liquid crystal in the first opening region 141, so that the light passes through the liquid crystal and reaches the fingerprint identification unit to perform fingerprint identification.
Fig. 2 is a schematic structural diagram of another embodiment of a display panel according to the embodiment of the present application. In some embodiments of the present disclosure, the first substrate 11 may be a color filter substrate, and the first substrate 11 may further include a glass substrate and a polarizer disposed above the black matrix layer 14.
And the second substrate 12 may be an array substrate including a fingerprint identification unit 15 and a thin film transistor 17; the fingerprint recognition unit 15 is used for fingerprint recognition, and the thin film transistor 17 is mainly used for normal display.
As shown in fig. 2, the array substrate 12 may include a plurality of film layer structures disposed in a stack. Wherein, the array substrate 12 may include a glass substrate; the buffer layer is arranged above the glass substrate; the amorphous silicon layer is arranged above the buffer layer; a gate insulating layer is formed on the amorphous silicon layer, and a second opening region is formed on the gate insulating layer, so that the amorphous silicon layer is exposed at a position corresponding to the second opening region, that is, the gate insulating layer does not completely cover the amorphous silicon layer.
It should be noted that, in the embodiment of the present application, the fingerprint identification unit 15 and the thin film transistor 17 each include the above-mentioned film layer structure; namely, the fingerprint identification unit 15 and the thin film transistor 17 each include a glass substrate; the buffer layer is arranged above the glass substrate; the amorphous silicon layer is arranged above the buffer layer; and a gate insulating layer is formed over the amorphous silicon layer.
Referring to fig. 2, a second opening region is formed in the gate insulating layer in the fingerprint identification unit 15, such that a portion of the amorphous silicon layer is exposed; and the gate insulating layer completes the amorphous silicon layer in the thin film transistor 17. Meanwhile, the fingerprint identification unit 15 further includes a photosensitive layer 18, the photosensitive layer 18 is disposed in the second opening region, and the liquid crystal regulation unit 16 is disposed above the photosensitive layer 18.
In an embodiment of the present application, the liquid crystal cell 16 may include a first electrode layer 161 and a second electrode layer 162 that are oppositely disposed, and further include an insulating layer disposed between the first electrode layer 161 and the second electrode layer 162. As shown in fig. 2, the fingerprint identification unit 15 includes a liquid crystal regulation unit 16, that is, the fingerprint identification unit 15 itself includes an electrode layer, but an electrode layer is added on the basis of the original fingerprint identification unit 15 to form a first electrode layer 161 and a second electrode layer 162 which are oppositely disposed, so as to form a liquid crystal regulation unit.
In the display panel shown in fig. 2, a gate electrode is also formed above the gate insulating layer, including the gate electrode in the fingerprint identification unit 14 and the gate electrode in the thin film transistor 17. And the photosensitive layer 18 in the fingerprint identification unit 15 is disposed at the second opening region on the gate insulating layer, and the upper surface of the photosensitive layer 18 may be parallel to the upper surface of the gate insulating layer to ensure the flatness of the display panel.
In the display panel shown in fig. 2, the photosensitive layer may be a stacked multilayer structure, and the photosensitive layer is mainly used for sensing light reflected by a finger when the display panel performs fingerprint identification, and further converting an optical signal into an electrical signal to realize fingerprint identification.
In the above embodiment, an interlayer dielectric layer is further disposed above the gate layer and the photosensitive layer, and the interlayer dielectric layer is also an insulating layer; in the embodiments of the present disclosure, the interlayer dielectric layer mainly isolates the gate layer from other layers, thereby preventing the gate layer from being conducted with other layers. The interlayer dielectric layer can be made of silicon dioxide material with a dielectric constant of 3.9-4.0.
Meanwhile, a plurality of third opening areas are formed on the interlayer dielectric layer, and the third opening areas penetrate through the interlayer dielectric layer and the grid insulation layer, so that part of the amorphous silicon layer is exposed. And forming an active drain layer above the third opening region and the interlayer dielectric layer, wherein the source drain layer is connected with part of the amorphous silicon layer by using the third opening region.
It should be noted that, in the embodiment of the present application, the fingerprint identification unit 15 and the thin film transistor 17 both include a source drain layer, and the source drain layer is connected to a portion of the amorphous silicon layer through the third opening region.
As shown in fig. 2, the display panel further includes a passivation layer disposed above the source and drain layers, and a fourth opening region is formed on the passivation layer in a region corresponding to the photosensitive layer 18. The fourth opening region penetrates the passivation layer and a portion of the interlayer dielectric layer, so that a portion of the photosensitive layer 18 is exposed. And a fourth opening region is also formed on the passivation layer at the thin film transistor 17, but the fourth opening region in the thin film transistor 17 is formed above the source and drain layers of the thin film transistor 17 so that a portion of the source and drain layers is exposed.
Referring to fig. 2, a fourth opening area is formed on the passivation layer in the fingerprint identification unit 15 in fig. 2, such that a portion of the photosensitive layer 18 is exposed, and a first electrode layer is formed on the fourth opening area and a portion of the surface of the passivation layer near the fourth opening area, the first electrode layer covers an inner side of the fourth opening area, and a portion of the surface of the passivation layer near the fourth opening area.
The first electrode layer 161 is also included in the thin film transistor 17, but the first electrode layer 161 in the thin film transistor 17 is not located in the fourth opening region, and is located only above the passivation layer.
In the above embodiment, above the first electrode layer 161 and the passivation layer, the display panel is further provided with a planarization layer, the upper surface of the planarization layer is flat to ensure that the upper surface of the array substrate 12 is flat, and the planarization layer may be a multi-layer structure arranged in a stacked manner to further ensure that the upper surface of the array substrate 12 is flat.
However, in the embodiment of the present application, the fingerprint identification unit 15 further includes a liquid crystal regulation unit 16, and the liquid crystal regulation unit 16 may include a first electrode layer 161 and a second electrode layer 162 that are oppositely disposed. Therefore, a second electrode layer 162 is formed over the first electrode layer 161; and a planarization layer is further formed between the first electrode layer 161 and the second electrode layer 162.
That is, in the embodiment of the present application, after the planarization layer is prepared, the passivation layer is filled in the fourth opening region, except for the first electrode layer 161, but in order to prepare and form the liquid crystal adjusting unit 16, an opening process needs to be performed on the planarization layer, and a fifth opening region is formed on the planarization layer and at a position corresponding to the fourth opening region. And the second electrode layer 162 is prepared in the fifth opening region, the second electrode layer 162 is also formed over a portion of the planarization layer.
Referring to fig. 2, the first electrode layer 161 and the second electrode layer 162 are disposed opposite to each other, the first electrode layer 161 may be directly connected to the photosensitive layer 18, and a portion of the second electrode layer 162 is disposed above the planarization layer and directly contacts the liquid crystal layer. A liquid crystal regulation unit is formed among the first electrode layer 161, the second electrode layer 162 and the passivation layer; that is, the insulating layer disposed between the first electrode layer 161 and the second electrode layer 162 may be a planarization layer.
In the thin film transistor 17, the first electrode layer 161 and the second electrode layer 162 are also included in the thin film transistor 17, but the first electrode layer 161 in the thin film transistor 17 is not provided in the fourth opening region, and the second electrode layer 162 is completely filled in the fourth opening region in the thin film transistor 17, and a part of the second electrode layer 162 is also provided on the planarization layer.
Note that, in the embodiment of the present application, the planarization layer completely covers the fingerprint identification unit 15 and the first electrode layer 161 in the thin film transistor 17, and the fingerprint identification unit 15 and a part of the second electrode layer 162 in the thin film transistor 17 are disposed above the planarization layer.
In the embodiment of the present application, the first electrode layer 161 may be a common electrode layer, and the second electrode layer 162 is a pixel electrode layer, so that the liquid crystal regulating unit 16 has a structure including the common electrode layer, the planarization layer and the pixel electrode layer from top to bottom. Since the thin film transistor 17 also includes the pixel electrode layer and the common electrode layer, when the liquid crystal regulation unit 16 is prepared, the same preparation method can be used to simultaneously prepare the pixel electrode layers in the liquid crystal regulation unit and the thin film transistor 17, and then prepare the common electrode layer, so that an additional manufacturing process is not needed, and manpower and material resources are saved.
In other embodiments of the present disclosure, the first electrode layer 161 may also be a pixel electrode layer, and the second electrode layer 162 is a common electrode layer, and the liquid crystal cell 16 includes a pixel electrode layer, a planarization layer, and a common electrode layer in sequence from top to bottom. That is, in the embodiment of the present application, the positional relationship between the first electrode layer 161 and the second electrode layer 162 in the liquid crystal regulating unit 16 is not fixed only.
In the embodiment of the present application, the liquid crystal adjusting unit 16 and the thin film transistor 17 are independent from each other. That is, the liquid crystal regulating unit 16 controls only the deflection direction of the liquid crystal at the first opening region 141; and the thin film transistor controls only the deflection direction of the liquid crystal in the other regions except for the first opening region 141. When the display panel normally displays a picture, the liquid crystal adjusting and controlling unit 16 can control the deflection of the liquid crystal at the first opening region 141, so that the light cannot be transmitted after the liquid crystal at the first opening region 141 is deflected, thereby avoiding light leakage. When the display panel needs to perform fingerprint identification, the liquid crystal control unit 16 may control the liquid crystal in the first opening region 141 to deflect until the liquid crystal is in the same direction as the liquid crystal in the other regions except the first opening region 141, and at this time, light may normally pass through the first opening region 141, so as to implement fingerprint identification.
In the embodiment of the present application, the display panel further includes a backlight module, the backlight module is disposed below the glass substrate, and a light shielding layer is further disposed in the buffer layer and in a region corresponding to the fingerprint identification unit 15. The shading layer can shelter from the light from backlight unit, and the light of avoiding backlight unit causes the influence to fingerprint identification.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The display panel and the display device provided by the embodiments of the present application are described in detail above, and the principle and the implementation of the present application are explained in the present application by applying specific examples, and the description of the embodiments above is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (9)
1. A display panel is characterized by comprising a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate and the second substrate are oppositely arranged, and the liquid crystal layer is arranged between the first substrate and the second substrate;
a black matrix layer is arranged on one side, close to the second substrate, of the first substrate, and a first opening region is formed in the black matrix layer;
a fingerprint identification unit is arranged on the second substrate corresponding to the first opening area and comprises a liquid crystal regulation and control unit, and the liquid crystal regulation and control unit is used for regulating the deflection direction of the liquid crystal in the first opening area when the display panel normally displays.
2. The display panel according to claim 1, wherein the liquid crystal cell comprises a first electrode layer and a second electrode layer which are oppositely disposed, and wherein the liquid crystal cell further comprises an insulating layer disposed between the first electrode layer and the second electrode layer.
3. The display panel according to claim 2, wherein the first electrode layer is a common electrode layer, and wherein the second electrode layer is a pixel electrode layer.
4. The display panel according to claim 1, wherein the fingerprint recognition unit further comprises:
a glass substrate;
a buffer layer disposed over the glass substrate;
an amorphous silicon layer disposed over the buffer layer;
the grid insulating layer is arranged above the amorphous silicon layer, a second opening region is formed on the grid insulating layer, and a position, corresponding to the second opening region, on the amorphous silicon layer is exposed;
the photosensitive layer is arranged in the second opening area, and the liquid crystal regulation and control unit is arranged above the photosensitive layer.
5. The display panel according to claim 4, wherein the display panel further comprises a backlight module disposed below the glass substrate, and a light shielding layer is further disposed in the buffer layer and in a region corresponding to the fingerprint identification unit.
6. The display panel according to claim 1, wherein the display panel further comprises a thin film transistor, and the thin film transistor and the liquid crystal adjusting unit are independent of each other.
7. A display device comprising the display panel according to claim 1, the display panel comprising a first substrate and a second substrate which are oppositely disposed, and a liquid crystal layer disposed between the first substrate and the second substrate;
a black matrix layer is arranged on one side, close to the second substrate, of the first substrate, and a first opening region is formed in the black matrix layer;
a fingerprint identification unit is arranged on the second substrate at a position corresponding to the first opening area, the fingerprint identification unit comprises a liquid crystal regulation and control unit, and the liquid crystal regulation and control unit is used for adjusting the deflection direction of the liquid crystal in the first opening area when the display panel normally displays.
8. The display device according to claim 7, wherein the liquid crystal cell comprises a first electrode layer and a second electrode layer which are oppositely disposed, and wherein the liquid crystal cell further comprises an insulating layer disposed between the first electrode layer and the second electrode layer.
9. The display device according to claim 8, wherein the first electrode layer is a common electrode layer, and wherein the second electrode layer is a pixel electrode layer.
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| CN202011633903.5A CN112946945A (en) | 2020-12-31 | 2020-12-31 | Display panel and display device |
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| CN202011633903.5A CN112946945A (en) | 2020-12-31 | 2020-12-31 | Display panel and display device |
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| CN109061923A (en) * | 2018-08-31 | 2018-12-21 | 武汉华星光电技术有限公司 | Liquid crystal display panel |
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| CN212255968U (en) * | 2020-06-09 | 2020-12-29 | 昆山龙腾光电股份有限公司 | Liquid crystal display panel and liquid crystal display device |
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| JP2020021044A (en) * | 2018-07-31 | 2020-02-06 | 三星ディスプレイ株式會社Ｓａｍｓｕｎｇ Ｄｉｓｐｌａｙ Ｃｏ．，Ｌｔｄ． | Display |
| CN109061923A (en) * | 2018-08-31 | 2018-12-21 | 武汉华星光电技术有限公司 | Liquid crystal display panel |
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Application publication date: 20210611 |