CN113111775B - Display panel and preparation method thereof - Google Patents
Display panel and preparation method thereof Download PDFInfo
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- CN113111775B CN113111775B CN202110389897.1A CN202110389897A CN113111775B CN 113111775 B CN113111775 B CN 113111775B CN 202110389897 A CN202110389897 A CN 202110389897A CN 113111775 B CN113111775 B CN 113111775B
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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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- 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
- G02F1/136209—Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
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Abstract
The embodiment of the application provides a display panel and a preparation method thereof, wherein the display panel comprises: the first substrate is provided with a plurality of first areas which are arranged in an array manner; each first region comprises a first sub-region and a second sub-region; each light resistance unit is correspondingly arranged in a first subarea; each light resistance unit comprises at least three first light resistances with different colors; each second subarea is provided with at least one photosensitive unit for receiving a first optical signal incident from one side of the photosensitive unit, which deviates from the first substrate; each second subarea is also provided with light blocking units which correspond to the photosensitive units one by one; the light blocking unit is arranged around the photosensitive unit and used for blocking the photosensitive unit from receiving optical signals except the first optical signal. The light blocking unit of the embodiment of the application can improve the signal to noise ratio of fingerprint identification.
Description
Technical Field
The application belongs to the technical field of electronic equipment, and particularly relates to a display panel and a preparation method thereof.
Background
In recent years, the development of display technology is changing day by day, the iteration speed of products is high, and the market demand and taste are higher and higher. At present, the full screen technology and the optical fingerprint identification technology have become the main development technologies in recent years. The full-face screen can improve the screen ratio, improve the display area, and can improve the reading space under the condition of keeping the size of the display equipment unchanged. The optical fingerprint identification technology can be used for information security verification such as screen unlocking, account transfer, payment and the like, and various unsafe factors such as easy confusion, forgetting, leakage and the like of traditional password identification are eliminated. Optical fingerprint recognition has become a standard technology based on active Display such as Organic Light Emitting Diodes (OLEDs), quantum Dot Light Emitting Diodes (QLEDs), and other portable electronic products, while passive Display electronic products represented by Liquid Crystal Displays (LCDs) have not realized a mass-producible optical fingerprint recognition technology. The optical fingerprint identification technology is that light emitted from a display screen is irradiated on a finger, and a fingerprint signal formed by reflection of the finger is received by an optical sensor in the screen, so that the fingerprint signal is read. The display panel of the LCD optical fingerprint identification technology has low fingerprint identification sensitivity because the interference of noise signals reduces the fingerprint identification signal-to-noise ratio.
Disclosure of Invention
The embodiment of the application provides a display panel and a preparation method of the display panel, so as to improve the fingerprint identification signal-to-noise ratio of the display panel.
In a first aspect, an embodiment of the present application provides a display panel, including:
the first substrate is provided with a plurality of first areas which are arranged in an array manner; each first region comprises a first sub-region and a second sub-region;
a plurality of light resistance units, wherein each light resistance unit is correspondingly arranged in the first subarea; each light resistance unit comprises at least three first light resistances with different colors;
each second subarea is provided with at least one photosensitive unit for receiving a first optical signal incident from one side of the photosensitive unit, which deviates from the first substrate;
each second subarea is also provided with light blocking units which correspond to the photosensitive units one by one; the light blocking unit is arranged around the photosensitive unit and used for blocking the photosensitive unit from receiving optical signals except the first optical signal; and
a second substrate; the first substrate and the second substrate are oppositely arranged; one end of the light blocking unit is connected with the first substrate, and the other end of the light blocking unit is connected with the second substrate; a liquid crystal layer is arranged between the first light resistor and the second substrate; the first substrate is a glass substrate; the second substrate is a thin film transistor substrate;
the light blocking unit comprises a plurality of second light resistors, the second light resistors are of annular structures, and the second light resistors are arranged in a stacked mode in the direction perpendicular to the first substrate; the plurality of first light resistances comprise at least one red first light resistance, one green first light resistance and one blue first light resistance; the plurality of second photo-resists include at least one red second photo-resist, one green second photo-resist and one blue second photo-resist.
In a second aspect, an embodiment of the present application further provides a display panel, including:
the first substrate is provided with a plurality of first areas which are arranged in an array; each first region comprises a first sub-region and a second sub-region;
the second substrate is arranged opposite to the first substrate; the second substrate is provided with a plurality of second areas which are arranged in an array; the second region comprises a third sub-region and a fourth sub-region; the first sub-regions and the third sub-regions are in one-to-one correspondence in the direction perpendicular to the first substrate, and the second sub-regions and the fourth sub-regions are in one-to-one correspondence in the direction perpendicular to the first substrate;
each light resistance unit is correspondingly arranged in the first subarea; each light resistance unit comprises at least three first light resistances with different colors;
each fourth subarea is provided with at least one photosensitive unit for receiving a second optical signal incident from one side of the photosensitive unit, which deviates from the second substrate; and
each fourth subarea is also provided with light blocking units which correspond to the photosensitive units one by one; the light blocking unit is arranged around the photosensitive unit and used for blocking the photosensitive unit from receiving optical signals except the second optical signal;
wherein, the first substrate is a glass substrate; the second substrate is a thin film transistor substrate; the light blocking unit comprises a plurality of second light resistors, the second light resistors are of annular structures, and the second light resistors are arranged in a stacked mode in the direction perpendicular to the first substrate; the plurality of first light resistances comprise at least one red first light resistance, one green first light resistance and one blue first light resistance; the plurality of second photo-resists include at least one red second photo-resist, one green second photo-resist and one blue second photo-resist.
In a third aspect, an embodiment of the present application further provides a method for manufacturing a display panel, including the following steps:
the method comprises the steps that a photosensitive unit is arranged on a first substrate and used for receiving a first optical signal incident from one side, deviating from the first substrate, of the photosensitive unit;
coating a black matrix layer on the first substrate, processing the black matrix layer to expose the photosensitive units, and forming a plurality of first openings, a plurality of second openings, a plurality of third openings and a plurality of annular holes, wherein each annular hole is arranged around one photosensitive unit;
coating a first color light resistance layer in each first opening and each annular hole simultaneously to form a first color light resistance layer and a second color light resistance layer;
coating a light resistance layer of a second color in each second opening and on each second light resistance of the first color simultaneously to form a first light resistance of the second color and a second light resistance of the second color;
and coating a light resistance layer of a third color in each third opening and on each second light resistance of the second color simultaneously to form a first light resistance of the third color and a second light resistance of the third color, wherein the second light resistance of the first color, the second light resistance of the second color and the second light resistance of the third color which are arranged in a stacked manner form a light blocking unit so as to block the light sensing unit from receiving optical signals except the first optical signal.
The light blocking unit of this application embodiment is around sensitization unit setting for make sensitization unit can receive from sensitization unit top region get into the light signal that the unit that is in the light blocks around the region, block simultaneously that sensitization unit receives from the light signal that regional outside the sensitization unit top got into, in order to improve sensitization unit's fingerprint identification SNR.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can also be derived from them without inventive effort.
For a more complete understanding of the present application and its advantages, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts in the following description.
Fig. 1 is a schematic view of a first structure of a display panel according to an embodiment of the present disclosure.
Fig. 2 is a second structural schematic diagram of a display panel according to an embodiment of the present application.
Fig. 3 is a schematic view of a first structure of a photoresist unit and a photosensitive unit provided in the present application.
Fig. 4 is a schematic diagram of a second structure of the photoresist unit and the photosensitive unit provided in the present application.
Fig. 5 is a side view of the first structure shown in fig. 3.
Fig. 6 is a cross-sectional view of the first structure shown in fig. 3 taken along the direction P2-P2.
Fig. 7 is a first structural diagram of the display panel shown in fig. 1 cut along P1-P1.
Fig. 8 is a second structural view of the display panel shown in fig. 1, cut along P1-P1.
Fig. 9 is a third structural diagram of the display panel shown in fig. 1 cut along P1-P1.
Fig. 10 is a fourth structural view of the display panel shown in fig. 1, which is cut along the line P1-P1.
Fig. 11 is a fifth structural view of the display panel shown in fig. 2, which is cut along the line P1-P1.
Fig. 12 is a sixth structural view of the display panel shown in fig. 2, which is cut along the line P1-P1.
Fig. 13 is a seventh structural view of the display panel shown in fig. 2, which is cut along P1-P1.
Fig. 14 is an eighth structural view of the display panel shown in fig. 2, which is cut along P1-P1.
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 should be apparent that the described embodiments 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.
With the development of display technology, portable electronic devices such as smart phones and watches are becoming lighter and thinner, and have become "soul partners" for consumers. Electronic payment, bank security, internet security setting and the like are connected with the portable equipment. In the future, smart home systems, smart driving systems, IOT (Internet of things), and the like are more current research hotspots, and personal safety, property safety, and personal privacy protection generated thereby have become important topics. Therefore, consumers pay more attention to personal information security while paying attention to the display effect, appearance and experience of products. The fingerprint has specificity and permanent invariance, namely the fingerprint of anyone is different, and the line of the fingerprint has permanent invariance under non-external injury. It is composed of a series of ridges and valleys on the surface layer of the finger tip skin, and the lines comprise bifurcations, arches, spirals, breakpoints, and the like, and the minutiae such as the periodic change of fingerprints from inside to outside. Because fingerprints have the advantages of uniqueness, safety and the like, the fingerprint identification technology is highly accepted by the market as soon as the fingerprint identification technology appears. In recent years, optical fingerprint identification technology is developed, light emitted from a display screen is used for irradiating a finger, and a fingerprint signal reflected by the finger is received by an optical sensor in the screen to read the fingerprint signal. The display panel of the LCD optical fingerprint identification technology has low fingerprint identification sensitivity because the interference of noise signals reduces the fingerprint identification signal-to-noise ratio.
The embodiment of the present application provides two display panels with different main structures, which are described in detail below.
Referring to fig. 1 and 3-10, an exemplary embodiment of the present disclosure provides a display panel 10, which includes a first substrate 110, a plurality of photoresist units 200, a plurality of photosensitive units 400, and a plurality of light blocking units 600, for improving a signal-to-noise ratio of optical fingerprint recognition.
Referring to fig. 1, the first substrate 110 includes a plurality of first regions 112 arranged in an array manner; each first region 112 includes a first sub-region 1122 and a second sub-region 1124.
Referring to fig. 1, a plurality of photoresist units 200 are disposed in a first sub-region 1122, one photoresist unit 200 is disposed in each first sub-region 1122, and each photoresist unit 200 is disposed in each first sub-region 1122. The plurality of photoresist units 200 are arranged in an array on the first substrate 110. Each of the photo resist units 200 includes at least three first photo resists 220 of different colors. Each of the second sub-regions 1124 has at least one light-sensing unit 400 for receiving a first light signal incident from a side of the light-sensing unit 400 away from the first substrate 110. It is also understood that the light sensing unit 400 is configured to receive the light signal entering from the area above the light sensing unit 400. A plurality of light blocking units 600, each second sub-region 1124 further having light blocking units 600 corresponding to the light sensing units 400 one to one; the light blocking unit 600 is disposed around the light sensing unit 400 to block the light sensing unit 400 from receiving light signals other than the first light signal. It is also understood that the light sensing unit 400 is used to block the light sensing unit 400 from receiving light signals entering from the area outside the area above the light sensing unit 400.
It can be understood that, in the optical fingerprint identification technology, light emitted from a display screen is irradiated onto a finger, and a fingerprint signal formed by reflection of the finger is received by an optical sensor inside the screen, so that the fingerprint signal is read. Therefore, when a fingerprint is pressed on the display screen for fingerprint recognition, the light signal entering the area above the light sensing unit 400 is the light signal reflected by the fingerprint, and the light signal entering the area outside the area above the light sensing unit 400 is the interference light signal or the noise light signal. The noise signals include ambient light formed by pixels corresponding to the photoresist units of the display panel and reflected light reflected by the photoresist units after the backlight source irradiates the photoresist units. Therefore, the light blocking unit 600 is disposed around the light sensing unit 400, so that the light signal reflected by the fingerprint can reach the light sensing unit 400, and the noise signal can be blocked from reaching the light sensing unit 400, thereby improving the signal-to-noise ratio of fingerprint identification.
Referring to fig. 3-6, the light blocking unit 600 includes a plurality of second photo-resists 620, each second photo-resist 620 has a hollow structure 621, and the plurality of second photo-resists 620 are stacked in a direction perpendicular to the first substrate 110.
For example, the plurality of first photo resists 220 includes at least one first color first photo resist 222, at least one second color first photo resist 224, and at least one third color first photo resist 226, and the plurality of second photo resists 620 includes at least one first color second photo resist 622, at least one second color second photo resist 624, and at least one third color second photo resist 626. The first color, the second color, and the third color are different and are one of red, green, and blue.
For example, the plurality of first photo-resists 220 includes a red first photo-resist, a green first photo-resist and a blue first photo-resist; the plurality of second photo-resists 620 includes a red second photo-resist, a green second photo-resist and a blue second photo-resist; the first photo resists 220 and the second photo resists 620 have the same color sequence, which may be one of red, green, blue, green and red.
For example, the first photoresist 220 and the second photoresist 620 may be color filters with different colors. The first photoresist 220 and the second photoresist 620 are a red filter, a blue filter and a green filter.
Referring to fig. 6, the height of the photosensitive unit 400 is less than the height of the light blocking unit 600. It can be understood that, with the plane of the upper surface of the photosensitive unit 400 as the incident plane, when the light signal with a large angle of incidence enters the light blocking unit 600, since the height of the photosensitive unit 400 is smaller than the height of the light blocking unit 600, the light signal with a large angle of incidence will directly enter the inner sidewall of the light blocking unit 600, and the inner sidewall of the light blocking unit 600 absorbs or reflects the light signal, so that the light signal with a large angle of incidence can be blocked from reaching the photosensitive unit 400.
It can also be understood that, referring to fig. 3 and 4, the light blocking unit 600 has a hollow structure for placing the photosensitive unit 400. The light blocking unit 600 has a ring structure. The shape of the light blocking unit 600 may be a circular ring or a square ring or a rectangular ring or a ring of other shapes.
Referring to fig. 7, the black matrix layer 120 is disposed on the first substrate 110, and the black matrix layer 120 is disposed between the photosensitive unit 400 and the light blocking unit 600, and between the light blocking unit 600 and the first photoresist 220.
In some embodiments, referring to fig. 7, the display panel 10 further includes a second substrate 130, and the first substrate 110 is disposed opposite to the second substrate 130; one end of the light blocking unit 600 is connected to the first substrate 110, and the other end is connected to the second substrate 130; a liquid crystal layer 150 is disposed between the first photoresist 220 and the second substrate 130. It is understood that the first substrate 110 is a glass substrate and the second substrate 130 is a thin film transistor substrate.
It is understood that the light blocking unit 600, having one end connected to the first substrate 110 and the other end connected to the second substrate 130, may block noise optical signals from entering the inside of the light blocking unit 600 from between the light blocking unit 600 and the first substrate 110.
In other embodiments, referring to fig. 8, the display panel 10 further includes a second substrate 130 and a leveling layer 500 stacked together; the first substrate 110 and the leveling layer 500 are disposed opposite to the second substrate 130. It is understood that the leveling layer 500 is disposed on the side of the second substrate 130 facing the first substrate 110. One end of the light blocking unit 600 is connected to the first substrate 110, and the other end is connected to the leveling layer 500; the liquid crystal layer 150 is disposed between the first photoresist 220 and the filling layer 500. A plurality of lenses 300 are disposed within the fill-and-level layer 500; the lenses 300 correspond to the light sensing units 400 one to one; the convex surface of the lens 300 faces the light sensing unit 400.
The lens 300 is at least partially overlapped with the corresponding photosensitive unit 400 in the projection area of the first substrate 110, so that the lens 300 receives the optical signal vertically incident in the area above the photosensitive unit 400, that is, the optical signal reflected by the fingerprint, and converges the received optical signal to the photosensitive unit, thereby improving the fingerprint identification signal-to-noise ratio. In other embodiments, the lens 300 and the light-sensing unit 400 may be located in a position relationship such that the projection area of the lens 300 on the first substrate 110 covers the projection area of the corresponding light-sensing unit 400 on the first substrate 110. The lens 300 is located at the periphery of the corresponding light blocking unit 600 in the projection area of the first substrate 110 and in the projection coil formed on the first substrate 110, so as to prevent the edge of the lens 300 from extending above the liquid crystal layer to affect the pixel display. In other embodiments, referring to fig. 9, the display panel 10 further includes a second substrate 130 and a leveling layer 500 stacked on each other; the first substrate 110 and the leveling layer 500 are disposed opposite to the second substrate 130; one end of the light blocking unit 600 is connected to the first substrate 110, and the other end is connected to the filling and leveling layer 500; the liquid crystal layer 150 is disposed between the first photoresist 220 and the filling layer 500.
It is understood that the leveling layer 500 may ensure the height of the gap of the injected liquid crystal layer. The fill-up layer may be made of a highly transparent photoresist.
A plurality of light shielding units 700 are arranged in the filling and leveling layer 500; the light shielding units 700 correspond to the light sensing units 400 one by one; the light shielding unit 700 has a hollow opening 720. The projection area of the light shielding unit 700 on the first substrate 110 is offset from the projection area of the corresponding light receiving unit 400 on the first substrate 110. The hollow opening 720 of the light shielding unit 700 at least partially overlaps the corresponding light sensing unit 400 at the projection area of the first substrate 110. It is understood that the hollow opening 720 of the light shielding unit 700 is disposed at least partially opposite to the corresponding photosensitive unit 400.
It can be understood that, taking the plane of the upper surface of the photosensitive unit 400 as the incident plane, the light shielding unit 700 can block the light signal with large angle of incidence from entering the inside of the light blocking unit 600 to submit the fingerprint identification signal-to-noise ratio. Meanwhile, the outer circumference of the light shielding unit 700 is located in the projection coil of the first substrate 110 and the outer circumference of the light shielding unit 600 is located in the projection coil of the first substrate 110, so that the edge of the light shielding unit 700 is prevented from extending above the liquid crystal layer to affect the pixel display.
In other embodiments, referring to fig. 10, the leveling layer 500 is further provided with a plurality of light shielding units 700; the light shielding units 700 correspond to the light sensing units 400 one to one. The light shielding unit 700 is disposed around the lens 300. In other embodiments, the light shielding unit 700 may be located in a position relationship with the lens 300 such that the inner side of the light shielding unit 700 is in contact with the outer edge of the lens 300. The projection coil formed on the first substrate 110 at the outer circumference of the light blocking unit 700 is within the projection coil formed on the first substrate 110 at the outer circumference of the light blocking unit 600.
It can be understood that, by arranging the lens 300 and the light shielding unit 700 at the same time, the lens 300 can receive the light signal vertically incident in the area above the photosensitive unit 400, that is, the light signal reflected by the fingerprint, and converge the received light signal to the photosensitive unit; and can block light signals with large angle of incidence from entering the inside of the light blocking unit 600. Therefore, the fingerprint recognition signal is further improved than that of the lens 300 alone and the light shielding unit 700 alone.
It is understood that the side of the second substrate 130 facing away from the first substrate 110 is sequentially stacked with the upper polarizer 105, the adhesive layer 103, and the glass cover plate 102 from the proximal end to the distal end. The first substrate 110 is provided with a lower polarizer 106 and a backlight source 108 in sequence from a proximal end to a distal end, wherein the side of the first substrate facing away from the second substrate 130.
Referring to fig. 1-6 and 11-14, for example, another structure of the display panel 10 is provided to improve the signal-to-noise ratio of the optical fingerprint recognition.
Referring to fig. 1 and 2, a first substrate 110, the first substrate 110 having a plurality of first regions 112 arranged in an array; each first region 112 includes a first sub-region 1122 and a second sub-region 1124. A second substrate 130, wherein the second substrate 130 is arranged opposite to the first substrate 110; the second substrate 130 has a plurality of second regions 132 arranged in an array; second region 132 includes third sub-region 1322 and fourth sub-region 1324; the first sub-regions 1122 and the third sub-regions 1322 correspond to each other in a direction perpendicular to the first substrate 110, and the second sub-regions 1124 and the fourth sub-regions 1324 correspond to each other in a direction perpendicular to the first substrate 110. A plurality of photoresist units 200, one photoresist unit 200 is disposed in each first sub-region 1122, and each photoresist unit 200 is correspondingly disposed in one first sub-region 1122. The photoresist units 200 are arranged in an array on the first substrate 110. Each of the photo resist units 200 includes at least three first photo resists 220 of different colors. Each of the fourth sub-areas 1324 has at least one light-sensing unit 400 disposed thereon for receiving a second optical signal incident from a side of the light-sensing unit 400 away from the second substrate 130. It is also understood that the light sensing unit 400 is configured to receive the light signal entering from the area above the light sensing unit 400. A plurality of light blocking units 600, each fourth sub-region 1324 further provided with light blocking units 600 corresponding to the photosensitive units 400 one to one; the light blocking unit 600 is disposed around the light sensing unit 400 to block the light sensing unit 400 from receiving light signals other than the second light signal. It is also understood that the light sensing unit 400 is configured to block the light sensing unit 400 from receiving light signals entering from a region outside the region above the light sensing unit 400.
It can be understood that, in the optical fingerprint identification technology, light emitted from a display screen is irradiated onto a finger, and a fingerprint signal formed by reflection of the finger is received by an optical sensor inside the screen, so that the fingerprint signal is read. Therefore, when a fingerprint is recognized by pressing the fingerprint on the display screen, the light signal entering the area above the photosensitive unit 400 is the light signal reflected by the fingerprint, and the light signal entering the area outside the area above the photosensitive unit 400 is the disturbing light signal or the noise light signal. The noise signals include ambient light formed by pixels corresponding to the photoresist units of the display panel and reflected light reflected by the photoresist units after the backlight irradiates the photoresist units. Therefore, the light blocking unit 600 is disposed around the photosensitive unit 400, so that the light signal reflected by the fingerprint can reach the photosensitive unit 400, and the noise signal can be blocked from reaching the photosensitive unit 400, thereby improving the fingerprint identification signal-to-noise ratio.
Referring to fig. 3-6, the light blocking unit 600 includes a plurality of second photo-resists 620, the second photo-resists 620 have hollow structures 621, and the second photo-resists 620 are stacked in a direction perpendicular to the first substrate 110.
For example, the plurality of first photo resists 220 includes at least one first color first photo resist 222, at least one second color first photo resist 224, and at least one third color first photo resist 226, and the plurality of second photo resists 620 includes at least one first color second photo resist 622, at least one second color second photo resist 624, and at least one third color second photo resist 626. The first color, the second color, and the third color are different and are one of red, green, and blue.
For example, the plurality of first photo-resists 220 include a red first photo-resist, a green first photo-resist, and a blue first photo-resist; the plurality of second photo-resists 620 includes a red second photo-resist, a green second photo-resist and a blue second photo-resist; the first photo resists 220 and the second photo resists 620 have the same color sequence, which may be one of red, green, blue, green and red.
For example, the first photoresist 220 and the second photoresist 620 may be color filters with different colors. The first photoresist 220 and the second photoresist 620 are a red filter, a blue filter and a green filter.
Referring to fig. 6, the height of the photosensitive unit 400 is smaller than the height of the light blocking unit 600. It can be understood that, with the plane of the upper surface of the photosensitive unit 400 as the incident plane, when the light signal with a large angle of incidence enters the light blocking unit 600, because the height of the photosensitive unit 400 is smaller than the height of the light blocking unit 600, the light signal with a large angle of incidence will directly enter the inner sidewall of the light blocking unit 600, and the inner sidewall of the light blocking unit 600 absorbs or reflects the light signal, so that the light signal with a large angle of incidence can be prevented from reaching the photosensitive unit 400.
It can also be understood that, referring to fig. 3 and 4, the light blocking unit 600 has a hollow structure for placing the photosensitive unit 400. The light blocking unit 600 has a ring structure. The light blocking unit 600 may be in the shape of a circular ring or a square ring or a rectangular ring or a ring of other shape.
Referring to fig. 11, the black matrix layer 120 is disposed on the first substrate 110, and the black matrix layer 120 is disposed between the light blocking unit 600 and the first photoresist 220.
In some embodiments, referring to fig. 11, the first substrate 110 is disposed opposite to the second substrate 130; one end of the light blocking unit 600 is connected to the first substrate 110, and the other end is connected to the second substrate 130; a liquid crystal layer 150 is disposed between the first photoresist 220 and the second substrate 130. It is understood that the first substrate 110 is a glass substrate; the second substrate 130 is a thin film transistor substrate.
It is understood that the light blocking unit 600, having one end connected to the first substrate 110 and the other end connected to the second substrate 130, may block noise optical signals from entering the inside of the light blocking unit 600 from between the light blocking unit 600 and the first substrate 110.
In other embodiments, referring to fig. 12, a plurality of lenses 300 are disposed in the first substrate 110; the lenses 300 correspond to the light sensing units 400 one to one; the convex surface of the lens 300 faces the light sensing unit 400. The lens 300 covers the projection area of the corresponding photosensitive unit 400 on the first substrate 110 in the projection area of the first substrate 110, so that the lens 300 receives the optical signal vertically incident in the area above the photosensitive unit 400, that is, the optical signal reflected by the fingerprint, and converges the received optical signal to the photosensitive unit, thereby improving the signal-to-noise ratio of fingerprint identification. The lens 300 is located at the periphery of the corresponding light blocking unit 600 in the projection area of the first substrate 110 and in the projection coil formed on the second substrate 130, so as to prevent the edge of the lens 300 from extending above the liquid crystal layer to affect the pixel display.
In other embodiments, referring to fig. 13, a plurality of light-shielding units 700 are disposed in the first substrate 110; the light shielding units 700 correspond to the light sensing units 400 one by one; the light shielding unit 700 has a hollow opening 720; the projection area of the light shielding unit 700 on the first substrate 110 is staggered from the projection area of the corresponding photosensitive unit 400 on the first substrate 110; the hollow opening 720 of the light shielding unit 700 at least partially overlaps the projection area of the first substrate 110 of the corresponding light sensing unit 400 on the first substrate 110. It can be understood that, taking the plane of the upper surface of the photosensitive unit 400 as the incident plane, the light shielding unit 700 can block the light signal with large angle of incidence from entering the inside of the light blocking unit 600 to submit the fingerprint identification signal-to-noise ratio. Meanwhile, the periphery of the light shielding unit 700 is located in the projection coil of the first substrate 110 and the periphery of the light shielding unit 600 is located in the projection coil of the first substrate 110, so that the influence on pixel display caused by the fact that the edge of the light shielding unit 700 extends above the liquid crystal layer can be avoided.
In other embodiments, referring to fig. 14, a plurality of lenses 300 and a light shielding unit 700 are disposed in the first substrate 110; the lenses 300 and the light shielding units 700 correspond to the light sensing units 400 one by one; the convex surface of the lens 300 faces the photosensitive unit 400; the projection area of the lens 300 on the first substrate 110 covers the projection area of the corresponding photosensitive unit 400 on the first substrate 110; the lenses 300 are located at the outer circumference of the corresponding light blocking unit 600 in the projection area of the first substrate 110 within the projection coil formed on the second substrate 130.
It is understood that the light shielding unit 700 has a hollow structure, the light shielding unit 700 is disposed around the lens 300, and the inner side of the light shielding unit 700 is disposed in contact with the outer edge of the lens 300 to prevent light from passing between the light shielding unit 700 and the lens 300.
It can be understood that, by arranging the lens 300 and the light shielding unit 700 at the same time, the lens 300 can receive the light signal vertically incident in the area above the photosensitive unit 400, that is, the light signal reflected by the fingerprint, and converge the received light signal to the photosensitive unit; and can block light signals with large angle of incidence from entering the inside of the light blocking unit 600. Therefore, the fingerprint recognition signal is further improved than that of the lens 300 alone and the light shielding unit 700 alone. It can be understood that the side of the second substrate 130 opposite to the first substrate 110 is sequentially stacked with the upper polarizer 105, the adhesive layer 103, and the glass cover plate 102 from the proximal end to the distal end; the first substrate 110 is provided with a lower polarizer 106 and a backlight source 108 in sequence from a proximal end to a distal end, wherein the side of the first substrate facing away from the second substrate 130.
It can be understood that the main structure of the display panel shown in fig. 8-10 is that the liquid crystal layer is located above the light blocking unit; the main structure of the display panel shown in fig. 11-14 is that the liquid crystal layer is located below the photoresist unit.
The embodiment of the present application further provides a method for manufacturing a display panel, and in particular, a method for manufacturing a display panel 10 having a main structure shown in fig. 8 to 10, including the following steps:
a photosensitive unit 400 is arranged on the first substrate 110, and the photosensitive unit 400 is used for receiving a first optical signal incident from a side of the photosensitive unit 400, which is far away from the first substrate 110;
coating a black matrix layer 120 on the first substrate 110, and processing the black matrix layer 120 to expose the photosensitive cells 400 and form a plurality of first openings, a plurality of second openings, a plurality of third openings, and a plurality of annular holes, each of which is disposed around one of the photosensitive cells 400;
coating a photoresist layer of a first color in each first opening and each annular hole simultaneously to form a first photoresist 220 of the first color and a second photoresist 620 of the first color;
coating a photoresist layer of a second color in each second opening and on each second photoresist 620 of the first color simultaneously to form a first photoresist 220 of the second color and a second photoresist 620 of the second color;
and coating a light resistance layer of a third color in each third opening and on each second light resistance 620 of a second color simultaneously to form a first light resistance 220 of the third color and the second light resistance 620 of the third color, and forming a light blocking unit by the stacked second light resistance of the first color, the second light resistance of the second color and the second light resistance of the third color so as to block the light sensing unit from receiving light signals except the first light signal.
It is understood that the first, second, and third colors are different and are one of red, green, and blue; the first photoresist 220 of the first color, the first photoresist 220 of the second color, and the first photoresist 220 of the third color are sequentially arranged on the first substrate 110; the second photo resist 620 of the first color, the second photo resist 620 of the second color, and the second photo resist 620 of the third color are sequentially stacked and arranged perpendicular to the first substrate 110.
It is understood that when the photoresist layer of the first color is coated, the first photoresist 220 of the first color and the second photoresist 620 of the first color may be formed simultaneously; when coating the photoresist layer of the second color, the first photoresist 220 of the second color and the second photoresist 620 of the second color may be formed simultaneously; when the photoresist layer of the third color is coated, the first photoresist 220 of the third color and the second photoresist 620 of the third color may be formed simultaneously. At this time, the process of the photoresist unit 200 and the process of the light blocking unit 600 are simultaneously completed, so that the overall process of the display panel 10 is simplified.
It should be understood that the embodiments of the present application also provide a display device, which includes the display panel of the embodiments of the present application.
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.
In the description of the present application, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more features. It should be understood that reference herein to "a plurality" means three or more. It should also be understood that the side of the display panel used for identifying fingerprints is defined as "above" the display panel, and the side of the display panel with the backlight is defined as "below" the display panel, and is used for descriptive purposes only, and should not be construed as limiting the present application.
The display panel provided by the embodiment of the present application is described in detail above, and a method for manufacturing the display panel is also described, a specific example is applied in the description to explain the principle and the implementation manner of the present application, and the description of the above embodiment is only used to help understanding the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, 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 application.
Claims (8)
1. A display panel, comprising:
the first substrate is provided with a plurality of first areas which are arranged in an array manner; each first region comprises a first sub-region and a second sub-region;
a plurality of light resistance units, wherein each light resistance unit is correspondingly arranged in the first subarea; each light resistance unit comprises at least three first light resistances with different colors;
each second subarea is provided with at least one photosensitive unit for receiving a first optical signal incident from one side of the photosensitive unit, which deviates from the first substrate;
each second subarea is also provided with light blocking units which correspond to the photosensitive units one by one; the light blocking unit is arranged around the photosensitive unit and used for blocking the photosensitive unit from receiving optical signals except the first optical signal; and
a second substrate; the first substrate and the second substrate are arranged oppositely; one end of the light blocking unit is connected with the first substrate, and the other end of the light blocking unit is connected with the second substrate; a liquid crystal layer is arranged between the first light resistor and the second substrate; the first substrate is a glass substrate; the second substrate is a thin film transistor substrate;
the light blocking unit comprises a plurality of second light resistors, the second light resistors are of annular structures, and the second light resistors are arranged in a stacked mode in the direction perpendicular to the first substrate; the plurality of first light resistors comprise at least one red first light resistor, one green first light resistor and one blue first light resistor; the plurality of second light resistors comprise at least one red second light resistor, one green second light resistor and one blue second light resistor, the red first light resistor and the red second light resistor are formed simultaneously, the green first light resistor and the green second light resistor are formed simultaneously, and the blue first light resistor and the blue second light resistor are formed simultaneously.
2. The display panel according to claim 1, wherein a black matrix layer is provided over the first substrate, the black matrix layer being provided between the light sensing unit and the light blocking unit and between the light blocking unit and the first light resist; the height of the photosensitive unit is smaller than that of the light blocking unit.
3. The display panel according to claim 2, wherein the display panel further comprises a second substrate and a leveling layer, the second substrate and the leveling layer being stacked, the leveling layer being disposed on a side of the second substrate facing the first substrate; one end of the light blocking unit is connected with the first substrate, and the other end of the light blocking unit is connected with the filling layer; a liquid crystal layer is arranged between the first light resistance and the filling and leveling layer;
a plurality of lenses are arranged in the filling layer; the lenses correspond to the light sensing units one by one; the convex surface of the lens faces the photosensitive unit; the projection area of the lens on the first substrate is at least partially overlapped with the projection area of the corresponding photosensitive unit on the first substrate; the lens is positioned at the periphery of the corresponding light blocking unit in the projection area of the first substrate and is positioned in the projection coil formed by the first substrate.
4. The display panel according to claim 3, wherein the fill-and-level layer is further provided with a plurality of light shielding units; the shading units correspond to the photosensitive units one by one; the light shielding unit is arranged around the lens, and a projection coil formed by the periphery of the light shielding unit on the first substrate is arranged in the projection coil formed by the first substrate on the periphery of the light shielding unit.
5. The display panel according to claim 4, wherein an inner side of the light shielding unit is provided in contact with an outer edge of the lens.
6. The display panel according to claim 2, wherein the display panel further comprises a second substrate and a leveling layer, the second substrate and the leveling layer being stacked, the leveling layer being disposed on a side of the second substrate facing the first substrate; one end of the light blocking unit is connected with the first substrate, and the other end of the light blocking unit is connected with the filling layer; a liquid crystal layer is arranged between the first light resistance and the filling and leveling layer;
a plurality of shading units are arranged in the filling layer; the shading units correspond to the photosensitive units one by one; the shading unit is provided with a hollow opening; the projection area of the light shielding unit on the first substrate is staggered with the projection area of the corresponding photosensitive unit on the first substrate; the hollow opening of the shading unit is at least partially opposite to the corresponding photosensitive unit.
7. A display panel, comprising:
the first substrate is provided with a plurality of first areas which are arranged in an array; each first region comprises a first sub-region and a second sub-region;
the second substrate is arranged opposite to the first substrate; the second substrate is provided with a plurality of second areas which are arranged in an array; the second region comprises a third sub-region and a fourth sub-region; the first sub-regions and the third sub-regions are in one-to-one correspondence in a direction perpendicular to the first substrate, and the second sub-regions and the fourth sub-regions are in one-to-one correspondence in a direction perpendicular to the first substrate;
a plurality of light resistance units, wherein each light resistance unit is correspondingly arranged in the first subarea; each light resistance unit comprises at least three first light resistances with different colors;
each fourth subarea is provided with at least one photosensitive unit for receiving a second optical signal incident from one side of the photosensitive unit, which deviates from the second substrate; and
each fourth subarea is also provided with light blocking units which correspond to the photosensitive units one by one; the light blocking unit is arranged around the photosensitive unit and used for blocking the photosensitive unit from receiving optical signals except the second optical signal;
wherein the first substrate is a glass substrate; the second substrate is a thin film transistor substrate; the light blocking unit comprises a plurality of second light resistors, the second light resistors are of annular structures, and the second light resistors are arranged in a stacked mode in the direction perpendicular to the first substrate; the plurality of first light resistors comprise at least one red first light resistor, one green first light resistor and one blue first light resistor; the plurality of second light resistors comprise at least one red second light resistor, one green second light resistor and one blue second light resistor, the red first light resistor and the red second light resistor are formed simultaneously, the green first light resistor and the green second light resistor are formed simultaneously, and the blue first light resistor and the blue second light resistor are formed simultaneously.
8. A preparation method of a display panel is characterized by comprising the following steps:
the method comprises the steps that a photosensitive unit is arranged on a first substrate and used for receiving a first optical signal incident from one side, deviating from the first substrate, of the photosensitive unit;
coating a black matrix layer on the first substrate, processing the black matrix layer to expose the photosensitive units, and forming a plurality of first openings, a plurality of second openings, a plurality of third openings and a plurality of annular holes, wherein each annular hole is arranged around one photosensitive unit;
coating a first color light resistance layer in each first opening and each annular hole simultaneously to form a first color light resistance layer and a first color second light resistance layer;
coating a photoresist layer of a second color in each second opening and on each second photoresist of the first color simultaneously to form a first photoresist of the second color and a second photoresist of the second color;
and coating a light resistance layer of a third color in each third open hole and each second light resistance of the second color simultaneously to form a first light resistance of the third color and a second light resistance of the third color, and forming a light blocking unit by the stacked second light resistance of the first color, the stacked second light resistance of the second color and the stacked second light resistance of the third color so as to block the light sensing unit from receiving optical signals except the first optical signal.
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| US20090161920A1 (en) * | 2007-12-25 | 2009-06-25 | Hitachi Maxell, Ltd. | Biometric information acquisition apparatus, image acquisition apparatus, and electronic equipment |
| JP5935498B2 (en) * | 2012-05-15 | 2016-06-15 | ソニー株式会社 | Information processing apparatus, information processing method, program, and information processing system |
| CN105678255B (en) * | 2016-01-04 | 2019-01-08 | 京东方科技集团股份有限公司 | A kind of optical fingerprint identification display screen and display device |
| US20180012069A1 (en) * | 2016-07-06 | 2018-01-11 | Samsung Electronics Co., Ltd. | Fingerprint sensor, fingerprint sensor package, and fingerprint sensing system using light sources of display panel |
| JP6880701B2 (en) * | 2016-12-19 | 2021-06-02 | セイコーエプソン株式会社 | Electro-optics and electronic equipment |
| WO2020147018A1 (en) * | 2019-01-15 | 2020-07-23 | 深圳市汇顶科技股份有限公司 | Optical image acquisition system and electronic device |
| CN110309705B (en) * | 2019-04-30 | 2022-04-19 | 厦门天马微电子有限公司 | Display panel and display device |
| CN110161739B (en) * | 2019-06-19 | 2022-09-16 | 厦门天马微电子有限公司 | Display panel and display device |
| CN110263727B (en) * | 2019-06-24 | 2022-03-22 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and image acquisition method |
| CN110286717B (en) * | 2019-06-24 | 2021-07-02 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and image acquisition method |
| CN110501839A (en) * | 2019-07-30 | 2019-11-26 | 武汉华星光电技术有限公司 | Display panel and display device |
| CN110850628B (en) * | 2019-10-24 | 2022-02-22 | 武汉华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
| CN111291719A (en) * | 2020-03-03 | 2020-06-16 | 北京迈格威科技有限公司 | Fingerprint identification device, display panel, equipment and fingerprint identification method |
| CN111983841A (en) * | 2020-08-21 | 2020-11-24 | 武汉华星光电技术有限公司 | Display panel |
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