CN111754876B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN111754876B CN111754876B CN202010601626.3A CN202010601626A CN111754876B CN 111754876 B CN111754876 B CN 111754876B CN 202010601626 A CN202010601626 A CN 202010601626A CN 111754876 B CN111754876 B CN 111754876B
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- antireflection film
- refractive index
- optical sensor
- film layer
- display panel
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/113—Anti-reflection coatings using inorganic layer materials only
- G02B1/115—Multilayers
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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
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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
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
Abstract
The invention discloses a display panel and a display device, the display panel includes: the display module comprises a substrate and a plurality of pixel units positioned on one side of the substrate; the anti-reflection structure is positioned on the surface of one side of the substrate base plate, which is far away from the pixel unit, and/or the anti-reflection structure is positioned on the surface of one side of the substrate base plate, which is near to the pixel unit; the anti-reflection structure comprises at least one anti-reflection film layer and at least two different refractive indexes; and the optical sensor is positioned on the surface of one side of the substrate base plate far away from the anti-reflection structure, or the optical sensor is positioned on the surface of one side of the substrate base plate far away from the pixel unit. According to the technical scheme provided by the embodiment of the invention, the light transmittance of the display module is improved through the anti-reflection structure, and the light sensation function of the optical sensor in the display panel is enhanced.
Description
Technical Field
The embodiment of the invention relates to the technical field of semiconductors, in particular to a display panel and a display device.
Background
With the development of science and technology, display panels are more and more widely applied to display devices such as smart phones, tablet computers and notebook computers.
The display panel is provided with the optical sensor, so that the functions of fingerprint identification, screen brightness adjustment, photographing and the like can be realized. In the display panel, the optical sensor is generally disposed below the display module, and the light passes through the display module and is converted into a corresponding electrical signal by the optical sensor below the display module.
However, the transmittance of the conventional display module is too low, which results in poor light sensing function of the optical sensor in the display panel.
Disclosure of Invention
In view of this, embodiments of the present invention provide a display panel and a display device, which improve the light transmittance of the display module and enhance the light sensing function of the optical sensor in the display panel.
An embodiment of the present invention provides a display panel, including:
the display module comprises a substrate and a plurality of pixel units positioned on one side of the substrate;
the anti-reflection structure is positioned on the surface of one side, far away from the pixel unit, of the substrate base plate, and/or the anti-reflection structure is positioned on the surface of one side, near the pixel unit, of the substrate base plate; the antireflection structure comprises at least one antireflection film layer, and the antireflection structure has at least two different refractive indexes;
an optical sensor, which is located on the surface of the substrate base plate on the side far away from the antireflection structure, or,
the optical sensor is positioned on the surface of one side of the substrate base plate far away from the pixel unit.
According to the technical scheme, the anti-reflection structure is located on the surface of one side, away from the pixel unit, of the substrate base plate and/or the surface of one side, close to the pixel unit, of the substrate base plate, the reflection effect of light before being converted by the optical sensor is reduced, so that the light transmittance of the display module is increased, the light sensation function of the optical sensor in the display panel is enhanced, and further the functions of fingerprint identification, screen brightness adjustment, photographing and the like are enhanced. In addition, the anti-reflection structure comprises at least one anti-reflection film layer, the anti-reflection structure has at least two different refractive indexes, and compared with the anti-reflection structure with only one refractive index, the wavelength of light transmitted by the anti-reflection structure is not a certain wavelength any longer, but a wavelength range, namely, the wavelength range of light transmitted by the anti-reflection structure is widened. When the reflection reducing structure has more refractive indexes, the thickness of the reflection reducing structure is thicker, and the light-transmitting wavelength range of the reflection reducing structure is wider.
Optionally, the substrate base plate includes a plurality of light-transmitting areas, a plurality of non-light-transmitting areas, and a plurality of metal wires, a part or all of the optical sensor is located in the light-transmitting areas, the pixel unit is located in the non-light-transmitting areas, and a projection of the optical sensor on the substrate base plate and a projection of the metal wires on the substrate base plate are not overlapped.
Among this technical scheme, optical sensor walks the projection of line at the substrate base plate and the metal and does not have the overlap at the projection of substrate base plate, can avoid the metal to walk the line and reflect light to increase display module's luminousness and strengthen optical sensor's among the display panel light sense function, and then strengthened fingerprint identification, adjust functions such as screen brightness and shoot.
Optionally, the antireflection structure includes an antireflection film layer, and the refractive index of the antireflection film layer continuously changes with the thickness of the antireflection film layer.
In the technical scheme, the anti-reflection structure comprises an anti-reflection film layer, the refractive index of the anti-reflection film layer continuously changes along with the change of the thickness of the anti-reflection film layer, the thicker the anti-reflection film layer of the anti-reflection structure is, the wider the light transmission wavelength range of the whole anti-reflection structure is, and the wider the wavelength range of light waves which can be converted into electric signals by the optical sensor is.
Optionally, the antireflection film layers include a first refractive index antireflection film layer and a second refractive index antireflection film layer, where the first refractive index antireflection film layer and the second refractive index antireflection film layer are alternately arranged, the refractive index of the first refractive index antireflection film layer is not equal to the refractive index of the second refractive index antireflection film layer, and the number of the antireflection film layers is a multiple of 2.
In the technical scheme, the first refractive index antireflection film layer and the second refractive index antireflection film layer are alternately arranged, the refractive index of the first refractive index antireflection film layer is not equal to that of the second refractive index antireflection film layer, the thicker the thickness of the antireflection film layer included in the antireflection structure is, the wider the wavelength range of the whole antireflection structure is, and the wider the wavelength range of the light waves which can be converted into the electric signals by the optical sensor is.
Optionally, the antireflection film layers include a third refractive index antireflection film layer, a fourth refractive index antireflection film layer, and a fifth refractive index antireflection film layer, where the third refractive index antireflection film layer, the fourth refractive index antireflection film layer, and the fifth refractive index antireflection film layer are periodically arranged, the refractive indices of the third refractive index antireflection film layer, the fourth refractive index antireflection film layer, and the fifth refractive index antireflection film layer are different, and the number of layers of the antireflection film is a multiple of 3.
In the technical scheme, the first refractive index antireflection film layer and the second refractive index antireflection film layer are alternately arranged, the refractive index of the first refractive index antireflection film layer is not equal to that of the second refractive index antireflection film layer, the thicker the thickness of the antireflection film layer included in the antireflection structure is, the wider the wavelength range of the whole antireflection structure is, and the wider the wavelength range of the light waves which can be converted into the electric signals by the optical sensor is.
Optionally, the anti-reflection structure includes at least one planar portion and two protruding portions located on two sides of each planar portion;
the plane parts are parallel to the substrate base plate, and the included angle between the side surface of each protruding part and the plane where the adjacent plane part is located is an obtuse angle or an acute angle;
the optical sensor is positioned in a space surrounded by the convex part and the plane part;
the refractive index of the anti-reflection structure close to the optical sensor is larger than that of the anti-reflection structure far away from the optical sensor.
In the technical scheme, the included angle alpha between the side face of the protruding portion and the plane where the adjacent plane portion is located is an obtuse angle or an acute angle, so that the incident angle of light rays propagating in the X direction in the space surrounded by the protruding portion and the plane portion on the side face of the protruding portion can be larger than or equal to a critical angle, the anti-reflection structure has at least two different refractive indexes, the refractive index of the anti-reflection structure adjacent to the optical sensor is larger than that of the anti-reflection structure far away from the optical sensor, the light rays in the X direction in the space surrounded by the protruding portion and the plane portion are totally reflected on the side face of the protruding portion, loss of light penetrating through the display module in the X direction is avoided, the total light intensity received by the optical sensor is increased, the light sensing function of the optical sensor in the display panel is enhanced, and functions of fingerprint identification, screen brightness adjustment, screen shooting and the like are enhanced.
Optionally, a surface of the protrusion portion on a side away from the substrate base plate and a surface of the optical sensor on a side away from the substrate base plate are located on the same plane.
This technical scheme makes the light that the X direction propagated in the space that bellying and plano enclose take place the total reflection at the side of bellying, and then avoids seeing through the loss of display module assembly's light in the X direction, has increased the light intensity total amount that optical sensor received, and then strengthens optical sensor's among the display panel light sense function, and then has strengthened functions such as fingerprint identification, adjust the screen bright and dark and shoot.
Optionally, the substrate further comprises a reflective layer disposed between the protrusion and the substrate base plate.
This technical scheme can be with the light reflection who transmits out the bellying to the optical sensor surface through the reflector layer, has increased the light intensity total amount that optical sensor received, and then has optical sensor's among the display panel light sense function, and then has strengthened fingerprint identification, has adjusted the functions such as screen brightness and shoot.
Optionally, the anti-reflection structure is located on a surface of the substrate far away from the pixel unit, and includes a plurality of discrete anti-reflection units;
and the surface of one side of each anti-reflection unit, which is far away from the substrate and is far away from the pixel unit, is provided with the optical sensor.
According to the technical scheme, the manufactured separated anti-reflection unit and the optical sensor can be formed in the light-transmitting area on the surface of the substrate far away from one side of the pixel unit in advance, so that the influence of a large-area film coating process on the display panel on the process of the display panel can be avoided.
The embodiment of the invention also provides a display device which comprises the display panel in any of the technical schemes.
According to the display device in the technical scheme, the anti-reflection structure is positioned on the surface of one side, away from the pixel unit, of the substrate base plate and/or the surface of one side, close to the pixel unit, of the substrate base plate, the reflection effect of light before the light is converted by the optical sensor is reduced, so that the light transmittance of the display module is increased, the light sensation function of the optical sensor in the display panel is enhanced, and further the functions of fingerprint identification, screen brightness adjustment, photographing and the like are enhanced.
According to the technical scheme provided by the embodiment, the anti-reflection structure is positioned on the surface of the side, away from the pixel unit, of the substrate base plate and/or the surface of the side, close to the pixel unit, of the substrate base plate, the reflection effect of light before the light is converted by the optical sensor is reduced, so that the light transmittance of the display module is increased, the light sensation function of the optical sensor in the display panel is enhanced, and further the functions of fingerprint identification, screen brightness adjustment, photographing and the like are enhanced. In addition, the anti-reflection structure comprises at least one anti-reflection film layer, the anti-reflection structure has at least two different refractive indexes, and compared with the anti-reflection structure with only one refractive index, the wavelength of light transmitted by the anti-reflection structure is not a certain wavelength any longer, but a wavelength range, namely, the wavelength range of light transmitted by the anti-reflection structure is widened. When the reflection reducing structure has more refractive indexes, the thickness of the reflection reducing structure is thicker, and the light-transmitting wavelength range of the reflection reducing structure is wider.
Drawings
Fig. 1 is a schematic structural diagram of a display panel provided in the prior art;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 6 is a top view of a display panel according to an embodiment of the invention;
FIG. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention
Fig. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 10 is a diagram illustrating an anti-reflection effect of a bump according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
In view of the above background, the transmittance of the conventional display module is too low. Fig. 1 is a schematic structural diagram of a display panel provided in the prior art. For this reason, referring to fig. 1, the conventional display panel includes a display module 10 and an optical sensor 20, where the display module 10 includes a substrate 11 and a plurality of pixel units 12 located on one side of the substrate 11; the optical sensor 20 is located on the surface of the substrate base plate 11 on the side away from the pixel unit 12. Since each film layer included in the display panel has a reflective effect on light, the transmittance of the conventional display module 10 for light fluctuates within a range of 3% to 5%, and the transmittance is too low, which results in poor light sensing function of the optical sensor in the display panel.
In view of the above technical problems, an embodiment of the present invention provides the following technical solutions:
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention. Fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 2, 3 and 4, the display panel includes: the display module 10, the display module 10 includes the substrate 11 and locates at the multiple pixel units 12 of one side of substrate 11; an anti-reflection structure 30, where the anti-reflection structure 30 is located on a surface of the substrate 11 on a side away from the pixel unit 12, and/or the anti-reflection structure 30 is located on a surface of the substrate 11 on a side adjacent to the pixel unit 12, where the anti-reflection structure 30 includes at least one anti-reflection film layer, and the anti-reflection structure 30 has at least two different refractive indexes, for example, one anti-reflection film layer has different thicknesses at different positions; and the optical sensor 20 is arranged on the surface of the substrate base plate on the side far away from the antireflection structure, or the optical sensor 20 is arranged on the surface of the substrate base plate 11 on the side far away from the pixel unit 12.
In the display panel shown in fig. 2, the anti-reflection structure 30 is located on a surface of the substrate 11 away from the pixel unit 12, and the optical sensor 20 is located on a surface of the substrate away from the anti-reflection structure. In the display panel shown in fig. 3, the anti-reflection structure 30 is located on the surface of the substrate 11 adjacent to the pixel unit 12, and the optical sensor 20 is located on the surface of the substrate 11 away from the anti-reflection structure 30. In the display panel shown in fig. 4, the anti-reflection structure 30 is located on the surface of the substrate 11 away from the pixel unit 12 and the surface of the substrate adjacent to the pixel unit 12, and the optical sensor 20 is located on the surface of the substrate 11 away from the anti-reflection structure 30.
In particular, the anti-reflective structure 30 may reduce reflection of light to increase transmission of light, i.e., to achieve redistribution of light energy between transmitted and reflected light. The classical theory of waves is that waves interfere during propagation. The interference is the superposition of two lines of waves, the superposition of the wave crest and the wave crest can lead to the energy increase of the waves, and the superposition of the wave crest and the wave trough can lead to the energy reduction of the waves. The energy of the energy-enhanced region is derived from the energy of the energy-diminished region.
Referring to fig. 2, 3 and 4, light passes through the display module 10 and the anti-reflection structure 30 and is converted into corresponding electrical signals by the optical sensor 20, and the anti-reflection structure 30 can reduce the reflection of the light before the light is converted by the optical sensor 20, so that the light transmittance of the display module 10 and the total light intensity received by the optical sensor 20 are increased, and the light sensing function of the optical sensor 20 in the display panel is enhanced. It should be noted that, two anti-reflection structures 30 are disposed in fig. 4, so that the effect of improving the light transmittance of the display module 10 and enhancing the light sensing function of the optical sensor in the display panel is more significant.
In which, antireflection structure 30 includes at least one antireflection film layer, and the number of antireflection film layers is not limited in the embodiment of the present invention. The number of layers of antireflective film layers may affect the thickness of the entire antireflective structure 30. The anti-reflection structure 30 has at least two different refractive indexes, and compared with an anti-reflection structure having only one refractive index, the wavelength of light transmitted by the anti-reflection structure 30 is not a certain wavelength, but a wavelength range, that is, the wavelength range of light transmitted by the anti-reflection structure 30 is widened. When the refractive index of anti-reflection structure 30 is larger, the thickness of anti-reflection structure 30 is thicker, and the wavelength range of light transmitted by anti-reflection structure 30 is wider.
According to the technical scheme provided by the embodiment, the anti-reflection structure 30 is located on the surface of the substrate 11 far away from the pixel unit 12 and/or the surface of the substrate 11 near the pixel unit 12, so that the reflection effect of light before being converted by the optical sensor 20 is reduced, the light transmittance of the display module 10 is increased, the light sensation function of the optical sensor in the display panel is enhanced, and further the functions of fingerprint identification, screen brightness adjustment, photographing and the like are enhanced. In addition, the anti-reflection structure 30 includes at least one anti-reflection film layer, and the anti-reflection structure 30 has at least two different refractive indexes, wherein the anti-reflection structure 30 has at least two different refractive indexes, and compared with an anti-reflection structure having only one refractive index, the wavelength of light transmitted by the anti-reflection structure 30 is not a certain wavelength any longer, but a wavelength range, that is, the wavelength range of light transmitted by the anti-reflection structure 30 is widened. When the refractive index of anti-reflection structure 30 is larger, the thickness of anti-reflection structure 30 is thicker, and the wavelength range of light transmitted by anti-reflection structure 30 is wider.
Fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 5, fig. 5 schematically shows an encapsulation film layer 13, a polarizer 14, and a glass cover plate 15 disposed in sequence over a pixel unit 12. It should be noted that the drawings of the embodiments of the present invention only illustrate the sizes of the elements and the thicknesses of the film layers by way of example, and do not represent actual sizes of the elements and the film layers in the display panel. Fig. 5 exemplarily illustrates a surface of the optical sensor 20 on a side of the substrate base plate 11 away from the pixel unit 12. The anti-reflection structure 30 can reduce the reflection of light before being converted by the optical sensor 20, thereby increasing the light transmittance of the display module 10 and the light sensing function of the optical sensor in the display panel, and further enhancing the functions of fingerprint identification, screen brightness adjustment, photographing and the like.
In the above technique, light enters the optical sensor 20 through the display module 10 and the anti-reflection structure 30, and the optical sensor 20 converts the light signal into a corresponding electrical signal. The anti-reflection structure 30 is located on the surface of the substrate 11 far away from the pixel unit 12 and/or the surface of the substrate 11 near the pixel unit 12, so as to reduce the reflection of light before the light is converted by the optical sensor 20, thereby increasing the light transmittance of the display module 10 and the light sensing function of the optical sensor in the display panel, and further enhancing the functions of fingerprint identification, screen brightness adjustment, photographing and the like. In order to further increase the light transmittance of the display module 10, the present embodiment provides the following technical solutions:
fig. 6 is a top view of a display panel according to an embodiment of the invention. Referring to fig. 6, the substrate 11 includes a plurality of light-transmitting regions 11A, a plurality of non-light-transmitting regions 11B, and a plurality of metal traces 40, a part or all of the optical sensor 20 is located in the light-transmitting region 11A, the pixel unit 12 is located in the non-light-transmitting region 11B, and a projection of the optical sensor 20 on the substrate 11 and a projection of the metal trace 40 on the substrate 11 do not overlap.
Specifically, the metal trace 40 includes a gate signal line, a data signal line, a power signal line, and the like, and is used for providing a driving signal for the pixel unit 12, and has a poor light transmittance but a strong reflection effect on light. The projection of the optical sensor 20 on the substrate 11 and the projection of the metal trace 40 on the substrate 11 are not overlapped, so that the metal trace 40 can be prevented from reflecting light, the light transmittance of the display module 10 is increased, the light sensing function of the optical sensor in the display panel is enhanced, and the wavelength range of light waves which can be converted into electric signals by the optical sensor is widened.
In order to further widen the light-transmitting wavelength range of the anti-reflection structure 30, so as to widen the range of the transmitted light wavelength of the display module 10, and further widen the wavelength range of the light wave that can be converted into the electrical signal by the optical sensor 20, the following technical solutions are provided in this embodiment: optionally, antireflective structure 30 comprises an antireflective film layer whose refractive index continuously changes with the thickness of the antireflective film layer.
Specifically, the antireflection structure 30 includes an antireflection film layer, the refractive index of the antireflection film layer continuously changes with the change in the thickness of the antireflection film layer, and the thicker the thickness of the antireflection film layer included in the antireflection structure 30 is, the wider the wavelength range of light transmitted by the whole antireflection structure 30 is, and the wider the wavelength range of light waves that can be converted into electrical signals by the optical sensor 20 is. For example, the end points of the range in which the refractive index of the anti-reflection film layer continuously changes with the change in the thickness of the anti-reflection film layer may be two refractive indexes corresponding to two dielectric layers directly contacting with each other on both sides of the anti-reflection film layer.
In order to widen the light-transmitting wavelength range of the anti-reflection structure 30, thereby widening the range of the transmitted light wavelength of the display module 10, and further widening the wavelength range of the light waves that can be converted into the electrical signals by the optical sensor 20. The embodiment also provides the following technical scheme:
fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Optionally, referring to fig. 7, the antireflection film layers include first refractive index antireflection film layers 30A and second refractive index antireflection film layers 30B, where the first refractive index antireflection film layers 30A and the second refractive index antireflection film layers 30B are alternately arranged, the refractive index of the first refractive index antireflection film layers 30A is not equal to the refractive index of the second refractive index antireflection film layers 30B, and the number of antireflection film layers is a multiple of 2. Illustratively, only 4 antireflection film layers are shown in FIG. 7.
Specifically, the antireflection film layers include first refractive index antireflection film layers 30A and second refractive index antireflection film layers 30B, where the first refractive index antireflection film layers 30A and the second refractive index antireflection film layers 30B are alternately arranged, the refractive index of the first refractive index antireflection film layers 30A is not equal to the refractive index of the second refractive index antireflection film layers 30B, the thicker the thickness of the antireflection film layers included in the antireflection structure 30 is, the wider the wavelength range of light transmitted by the whole antireflection structure 30 is, and the wider the wavelength range of light waves that can be converted into electrical signals by the optical sensor 20 is.
It should be noted that when the antireflection film layers are two layers, that is, the antireflection structures 30 with the first refractive index antireflection film layer 30A and the second refractive index antireflection film layer 30B alternately arranged, compared with an antireflection structure with only one refractive index, the wavelength of light transmitted through the antireflection structure is not a certain wavelength, but a wavelength range, that is, the wavelength range of light transmitted through the antireflection structure 30 is increased.
For example, the higher refractive index of the first refractive index antireflection film layer 30A and the second refractive index antireflection film layer 30B may be greater than or equal to 2.2 and less than or equal to 2.4, and the specific material may be titanium dioxide (TiO)2) Titanium oxide (Ti)2O3) Titanium oxide (Ti)3O5) Tantalum pentoxide (Ta)2O5) Zirconium dioxide (ZrO)2) Niobium pentoxide (Nb)2O5) And the like. The lower refractive index of the first refractive index antireflection film layer 30A and the second refractive index antireflection film layer 30B may be 1.3 or more and 1.5 or less, and the specific material may be silicon oxide (SiO)2) Or magnesium fluoride (MgF)2) And the like. The thickness of each antireflective film layer may be greater than or equal to 100nm and less than or equal to 200 nm. The setting of anti-reflection structure 30 can be guaranteed in the refractive index of above-mentioned anti-reflection coating layer, material and thickness selection for the luminousness to visible light of display module has shown the promotion on original basis, has increased the luminous intensity total amount that optical sensor 20 received, and then has strengthened optical sensor's among the display panel light sense function.
Fig. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Optionally, referring to fig. 8, the antireflection film layers include a third refractive index antireflection film layer 30C, a fourth refractive index antireflection film layer 30D, and a fifth refractive index antireflection film layer 30E, where the third refractive index antireflection film layer 30C, the fourth refractive index antireflection film layer 30D, and the fifth refractive index antireflection film layer 30E are periodically arranged, and refractive indexes of the third refractive index antireflection film layer 30C, the fourth refractive index antireflection film layer 30D, and the fifth refractive index antireflection film layer 30E are different. Illustratively, FIG. 8 shows only 3 antireflective film layers.
Specifically, under the condition that the number of the antireflection film layers is the same, the antireflection structure 30 having a different refractive index of the antireflection film layer is wider, and the wavelength range of light transmitted by the whole antireflection structure 30 is wider.
It should be noted that when the antireflection film layers are three layers, that is, the third refractive index antireflection film layer 30C, the fourth refractive index antireflection film layer 30D, and the fifth refractive index antireflection film layer 30E are the antireflection structures 30 arranged periodically, compared with an antireflection structure having only one refractive index, the wavelength of light transmitted through the antireflection structure 30 is not a certain wavelength, but a wavelength range, that is, the wavelength range of light transmitted through the antireflection structure 30 is widened.
For example, the maximum refractive index of the third, fourth and fifth refractive index antireflection film layers 30C, 30D and 30E may be greater than or equal to 2.2 and less than or equal to 2.4, and the specific material may be titanium dioxide (TiO)2) Titanium oxide (Ti)2O3) Titanium oxide (Ti)3O5) Tantalum pentoxide (Ta)2O5) Zirconium dioxide (ZrO)2) Niobium pentoxide (Nb)2O5) And the like. The smallest refractive index of the third, fourth and fifth refractive index antireflection film layers 30C, 30D, 30E may be greater than or equal to 1.3 and less than or equal to 1.5, and the specific material may be silicon oxide (SiO)2) Or magnesium fluoride (MgF)2) And the like. The thickness of each antireflective film layer may be greater than or equal to 100nm and less than or equal to 200 nm. The refractive index in the middle of third refractive index antireflection film layer 30C, fourth refractive index antireflection film layer 30D, and fifth refractive index antireflection film layer 30E may be greater than or equal to 1.6 and less than or equal to 1.8, and a specific material may be silicon oxide (SiO)2) And magnesium oxide (MgO). The setting that can guarantee anti-reflection structure 30 is selected to refractive index, material and the thickness of above-mentioned anti-reflection coating for the luminousness to visible light of display module has shown the promotion on original basis, has increased the luminous intensity total amount that optical sensor 20 received, and then has strengthened optical sensor's among the display panel light sense function, and then has strengthened functions such as fingerprint identification, adjust the bright dark and of screen and shoot.
In the above technical solution, the anti-reflection structure 30 can reduce the reflection of light in the Y direction before being converted by the optical sensor 20, so as to increase the light transmittance of the display module 10 and the total light intensity received by the optical sensor 20, and further enhance the light sensing function of the optical sensor in the display panel, thereby enhancing the functions of fingerprint identification, screen brightness adjustment, photographing and the like. In order to avoid the loss of the light passing through the display module 10 in the X direction, the present embodiment provides the following technical solutions:
fig. 9 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to FIG. 9, for example, where FIG. 9 shows only 4 antireflection film layers, antireflection structure 30 includes at least one planar segment 31 and two raised segments 32 on either side of each planar segment 31; the plane part 31 is parallel to the substrate base plate 11, and the included angle alpha between the side surface 32A of the convex part 32 and the plane where the adjacent plane part 31 is positioned is obtuse angle or acute angle; the optical sensor 20 is located in a space surrounded by the convex portion 32 and the plane portion 31; the refractive index of antireflective structures 30 adjacent to the optical sensor is greater than the refractive index of antireflective structures 30 distal from the optical sensor.
Illustratively, an included angle ≈ α between a side surface 32A of the convex portion 32 and a plane where the adjacent planar portion 31 is located is obtuse. The included angle ≦ α between the side surface 32A of the protrusion 32 and the plane where the adjacent planar portion 31 is located is an obtuse angle or an acute angle, which can increase the incident angle of the light ray propagating in the X direction in the space surrounded by the protrusion 32 and the planar portion 31 at the side surface 32A of the protrusion 32, and can adjust the specific value of ≦ α, so that the incident angle of the light ray propagating in the X direction in the space surrounded by the protrusion 32 and the planar portion 31 at the side surface 32A of the protrusion 32 is increased to a range greater than or equal to the critical angle.
Specifically, the included angle ^ alpha between the side surface 32A of the convex part 32 and the plane where the adjacent plane part 31 is positioned is an obtuse angle or an acute angle, so that the incident angle of the light ray propagating in the X direction in the space enclosed by the convex portion 32 and the plane portion 31 at the side 32A of the convex portion 32 may be greater than or equal to the critical angle, while anti-reflection structures 30 have at least two different refractive indices, the refractive index of anti-reflection structures 30 adjacent to optical sensor 20 is greater than the refractive index of anti-reflection structures 30 distal to optical sensor 20, so that the light in the X direction in the space surrounded by the convex portion 32 and the plane portion 31 is totally reflected at the side surface 32A of the convex portion 32, thereby avoiding the loss of light passing through the display module 10 in the X direction, increasing the total light intensity received by the optical sensor 20, and then the light sensation function of the optical sensor in the display panel is enhanced, and further the functions of fingerprint identification, screen brightness adjustment, photographing and the like are enhanced.
It should be noted that fig. 9 only shows 4 antireflection film layers, where the antireflection film layers include a first refractive index antireflection film layer 30A and a second refractive index antireflection film layer 30B, where the first refractive index antireflection film layer 30A and the second refractive index antireflection film layer 30B are alternately arranged, and a refractive index of the second refractive index antireflection film layer 30B is greater than a refractive index of the first refractive index antireflection film layer 30A, so that light in the X direction in a space surrounded by the protruding portion 32 and the flat portion 31 is totally reflected by the side surface 32A of the protruding portion 32, thereby avoiding loss of light passing through the display module 10 in the X direction, increasing the total light intensity received by the optical sensor 20, further enhancing the light sensing function of the optical sensor in the display panel, and further enhancing functions of fingerprint identification, screen brightness adjustment, photographing, and the like.
Alternatively, referring to fig. 9, the surface of the side of the protruding portion 32 away from the substrate base plate 11 and the surface of the side of the optical sensor 20 away from the substrate base plate 11 are located on the same plane.
Specifically, after passing through the display module 10 and the anti-reflection structure 30, the light propagates in the space enclosed by the convex portion 32 and the flat portion 31, and is divided into light propagating along the Y direction and light propagating along the X direction. The light propagating in the Y direction may be converted into corresponding electrical signals by the optical sensor 20. On the basis that the plane part 31 reduces the reflection action in the Y direction before the light is converted by the optical sensor 20, the surface of one side of the protruding part 32, which is far away from the substrate 11, and the surface of one side of the optical sensor 20, which is far away from the substrate 11, are located on the same plane, so that the light transmitted in the X direction in the space enclosed by the protruding part 32 and the plane part 31 is totally reflected on the side surface 32A of the protruding part 32, thereby avoiding the loss of the light penetrating through the display module 10 in the X direction, increasing the total light intensity received by the optical sensor 20, further enhancing the light sensing function of the optical sensor 20 in the display panel, further enhancing the functions of fingerprint identification, screen brightness adjustment, photographing and the like.
Fig. 10 is a diagram illustrating an anti-reflection effect of a protrusion according to an embodiment of the present invention. The cross-sectional shape of the optical sensor 20 may be circular, or may have another shape. The cross-sectional shapes of the corresponding flat portions 31 of the optical sensor 20 and the two convex portions 32 located on both sides of each flat portion 31 need to match the cross-sectional shape of the optical sensor 20. For example, when the cross-sectional shape of the optical sensor 20 is circular, referring to fig. 10, the cross-sectional shape of the two protruding portions 32 located at two sides of each planar portion 31 is a circular ring, and the circular ring forms an anti-reflection aperture 60, so that light rays propagating in the X direction in the space surrounded by the protruding portions 32 and the planar portion 31 are totally reflected at the side surfaces 32A of the protruding portions 32, thereby avoiding the loss of light passing through the display module 10 in the X direction, increasing the total light intensity received by the optical sensor 20, further enhancing the light sensing function of the optical sensor 20 in the display panel, further enhancing the functions of fingerprint identification, screen brightness adjustment, photographing and the like.
It should be noted that, in order to reduce the propagation distance of light between the anti-reflection structure 30 and the optical sensor 20, the distance between the anti-reflection structure 30 and the optical sensor 20 is not too far, and may be set in a range of greater than or equal to 10 micrometers and less than or equal to 50 micrometers, for example.
In order to prevent the light in the space surrounded by the convex portion 32 and the flat portion 31 from being transmitted out at the side 32A of the convex portion 32, the present embodiment provides the following technical solutions:
referring to fig. 9, the display panel further includes a reflective layer 50 disposed between the protrusion 32 and the base substrate 11.
The reflective layer 50 can reflect the light transmitted out of the protrusion 32 to the surface of the optical sensor 20, so that the total light intensity received by the optical sensor 20 is increased, the light sensation function of the optical sensor in the display panel is further enhanced, and the functions of fingerprint identification, screen brightness adjustment, photographing and the like are further enhanced. Illustratively, the reflective layer 50 may be a white high-reflectivity organic material.
In the foregoing technical solution, the anti-reflection structure 30 is a whole surface, and in order to avoid performing a large area coating process on the display panel, the following technical solution is proposed in this embodiment, referring to fig. 11, for example, fig. 11 only shows 4 anti-reflection film layers. The antireflection film layers include first refractive index antireflection film layers 30A and second refractive index antireflection film layers 30B, wherein the first refractive index antireflection film layers 30A and the second refractive index antireflection film layers 30B are alternately arranged. The anti-reflection structure 30 is located on the surface of the substrate base plate 11 on the side far away from the pixel unit, and comprises a plurality of discrete anti-reflection units 33; an optical sensor 20 is disposed on the surface of each anti-reflection unit 33 away from the side of the substrate away from the pixel unit.
Specifically, the manufactured separated anti-reflection unit 33 and the optical sensor 20 may be formed in advance in the light-transmitting area on the surface of the substrate 11 on the side away from the pixel unit, so as to avoid the influence of a large-area film coating process on the display panel on the process of the display panel.
Fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 12, the display device 02 includes the display panel 01 in the above-described embodiment. For example, the display device 02 may include a display device such as a mobile phone, a computer, and a smart wearable device, which is not limited in this embodiment of the present invention.
The display device provided by the embodiment of the invention comprises the display panel, so that the display device has the beneficial effects of the display panel, and the description is omitted.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A display panel, comprising:
the display module comprises a substrate and a plurality of pixel units positioned on one side of the substrate;
the optical sensor is positioned on one side of the substrate base plate far away from the pixel unit;
the anti-reflection structure is positioned on the surface of one side, far away from the pixel unit, of the substrate base plate, the optical sensor is also positioned on the surface of one side, far away from the substrate base plate, of the anti-reflection structure, and/or the anti-reflection structure is positioned on the surface of one side, near to the pixel unit, of the substrate base plate; the antireflection structure comprises at least one antireflection film layer, and the antireflection structure has at least two different refractive indexes;
when the antireflection structure comprises an antireflection film layer, the refractive index of the antireflection film layer continuously changes along with the change of the thickness of the antireflection film layer;
when the anti-reflection structure comprises two or two times of anti-reflection film layers, the anti-reflection structure comprises two refractive indexes;
when the anti-reflection structure comprises three or three times of anti-reflection film layers, the anti-reflection structure comprises three refractive indexes;
the anti-reflection structure comprises at least one plane part and two convex parts positioned on two sides of each plane part;
the plane parts are parallel to the substrate base plate, and the included angle between the side surface of each protruding part and the plane where the adjacent plane part is located is an obtuse angle or an acute angle;
the optical sensor is located in a space surrounded by the convex portion and the planar portion.
2. The display panel according to claim 1, wherein the substrate comprises a plurality of light-transmitting regions, a plurality of non-light-transmitting regions and a plurality of metal traces, part or all of the optical sensor is located in the light-transmitting regions, the pixel unit is located in the non-light-transmitting regions, and a projection of the optical sensor on the substrate and a projection of the metal traces on the substrate do not overlap.
3. The display panel of claim 1, wherein the antireflection film layers include first refractive index antireflection film layers and second refractive index antireflection film layers, wherein the first refractive index antireflection film layers and the second refractive index antireflection film layers are alternately arranged, the refractive index of the first refractive index antireflection film layers is not equal to the refractive index of the second refractive index antireflection film layers, and the number of layers of the antireflection film layers is a multiple of 2.
4. The display panel of claim 1, wherein the antireflection film layers comprise a third refractive index antireflection film layer, a fourth refractive index antireflection film layer and a fifth refractive index antireflection film layer, wherein the third refractive index antireflection film layer, the fourth refractive index antireflection film layer and the fifth refractive index antireflection film layer are arranged periodically, the refractive indexes of the third refractive index antireflection film layer, the fourth refractive index antireflection film layer and the fifth refractive index antireflection film layer are different, and the number of antireflection film layers is a multiple of 3.
5. The display panel according to claim 1,
the refractive index of the anti-reflection structure close to the optical sensor is larger than that of the anti-reflection structure far away from the optical sensor.
6. The display panel according to claim 5, wherein a surface of the convex portion on a side away from the substrate base plate and a surface of the optical sensor on a side away from the substrate base plate are located on the same plane.
7. The display panel according to claim 5, further comprising a reflective layer provided between the convex portion and the base substrate.
8. The display panel according to claim 1, wherein the anti-reflection structure is located on a surface of the substrate at a side away from the pixel unit, and comprises a plurality of discrete anti-reflection units;
and the surface of one side of each anti-reflection unit, which is far away from the substrate base plate, is provided with the optical sensor.
9. A display device comprising the display panel according to any one of claims 1 to 8.
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