CN112864182B - Photosensitive module and display device - Google Patents
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- CN112864182B CN112864182B CN202110035738.1A CN202110035738A CN112864182B CN 112864182 B CN112864182 B CN 112864182B CN 202110035738 A CN202110035738 A CN 202110035738A CN 112864182 B CN112864182 B CN 112864182B
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- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
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Abstract
The invention discloses a photosensitive module and a display device, which relate to the technical field of display and comprise: a substrate base plate and a light sensing unit; the light through hole is formed in one side, away from the substrate, of the light sensing unit, and is overlapped with the light sensing unit along the direction perpendicular to the substrate; the first light-transmitting layer and the second light-transmitting layer are arranged on one side, away from the light sensing unit, of the light-through hole, wherein the second light-transmitting layer is located on one side, away from the light sensing unit, of the first light-transmitting layer; the second light-transmitting layer comprises a first light-transmitting area and a second light-transmitting area, the orthographic projection of the first light-transmitting area on the substrate is overlapped with the light-through hole, and the orthographic projection of the second light-transmitting area on the substrate is not overlapped with the light-through hole; the micro lens is arranged on one side, away from the light sensing unit, of the second light transmitting layer, and the orthographic projection of the micro lens on the second light transmitting layer is overlapped with the first light transmitting area; the refractive index of the second light-transmitting region of the second light-transmitting layer is n0, the refractive index of the first light-transmitting layer is n1, and n0 is more than 1 and less than n1. This is favorable to improving the photosensitive quantity of the photosensitive unit.
Description
Technical Field
The invention relates to the technical field of display, in particular to a photosensitive module and a display device.
Background
From the CRT (Cathode Ray Tube) era to the liquid crystal era and now to the OLED (Organic Light-Emitting Diode) era, the display industry has been developing over decades. The display industry is closely related to our life, and the display technology cannot be separated from the traditional mobile phones, flat panels, televisions and PCs to the existing intelligent wearable devices and VR and other electronic devices.
With the development of full-screen, more and more electronic photosensitive devices are required to be integrated into a display device, for example, a fingerprint identification component is integrated into the display device so that the display device has a fingerprint identification function. The amount of light that can be sensed by the electronic photosensitive device directly affects the photosensitive performance of the display device, and how to effectively increase the amount of light that can be sensed by the electronic photosensitive device becomes one of the technical problems to be solved urgently at the present stage.
Disclosure of Invention
In view of this, the present invention provides a photosensitive module and a display device, which are beneficial to increase the amount of light rays sensed by a photosensitive unit in the photosensitive module, and are beneficial to increase the photosensitive performance of the photosensitive module and the display device. .
In a first aspect, the present application provides a photosensitive module, including:
a substrate base plate;
a light sensing unit disposed at one side of the substrate;
the light through hole is formed in one side, far away from the substrate, of the light sensing unit, and is overlapped with the light sensing unit along the direction perpendicular to the substrate;
the first light-transmitting layer and the second light-transmitting layer are arranged on one side, away from the light sensing unit, of the light-transmitting hole, wherein the second light-transmitting layer is located on one side, away from the light sensing unit, of the first light-transmitting layer; the second light-transmitting layer comprises a first light-transmitting area and a second light-transmitting area, the orthographic projection of the first light-transmitting area on the substrate base plate is overlapped with the light through hole, and the orthographic projection of the second light-transmitting area on the substrate base plate is not overlapped with the light through hole;
the micro lens is arranged on one side, away from the light sensing unit, of the second light transmitting layer, and the orthographic projection of the micro lens on the second light transmitting layer is overlapped with the first light transmitting area;
the refractive index of the second light-transmitting region of the second light-transmitting layer is n0, the refractive index of the first light-transmitting layer is n1, and n0 is greater than 1 and less than n1.
In a second aspect, the present application provides a display device including the photosensitive module provided in the present application.
Compared with the prior art, the photosensitive module and the display device provided by the invention at least realize the following beneficial effects:
in the photosensitive module and the display device comprising the photosensitive module, the photosensitive module comprises a light sensing unit arranged on one side of a substrate, and the light sensing unit is used for sensing light and performing light sensing identification according to the amount of the sensed light. One side of the light sensing unit, which is far away from the substrate base plate, is provided with a light through hole, and light is transmitted to the light sensing unit through the light through hole. And a first euphotic layer and a second euphotic layer are arranged on one side of the light through hole, which is far away from the light sensing unit, and the first euphotic layer is positioned between the second euphotic layer and the light sensing unit. And a micro lens is arranged on one side of the second light-transmitting layer, which is far away from the first light-transmitting layer, and is used for transmitting light rays to the light-transmitting hole through the second light-transmitting layer and the first light-transmitting layer after the light rays are converged, and further transmitting the light rays to the light sensing unit. Particularly, in the invention, a second light transmitting layer is introduced between the microlens and the first light transmitting layer, the second light transmitting layer comprises a first light transmitting area superposed with the orthographic projection of the microlens on the second light transmitting layer and a second light transmitting area not overlapped with the microlens, the refractive index of the second light transmitting layer in the second light transmitting area is larger than 1 and smaller than that of the first light transmitting layer, when light rays around the microlens are emitted into the light through hole from air, the critical incident point is changed, compared with the situation that the second light transmitting layer is not arranged, the critical incident point after the second light transmitting layer is arranged is deviated towards the direction far away from the microlens, the light receiving amount of the photosensitive module is increased, the light quantity sensed by the photosensitive unit is increased, and the photosensitive performance of the photosensitive module and the display device comprising the photosensitive module is improved.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a cross-sectional view of a photosensitive module provided in the related art;
FIG. 2 is a top view of the photosensitive module according to the embodiment of the present invention;
FIG. 3 is an AA cross-sectional view of the photosensitive module shown in FIG. 2;
FIG. 4 is a cross-sectional view of another AA of the photosensitive module of FIG. 2;
FIG. 5 is a cross-sectional view of another AA of the photosensitive module of FIG. 2;
FIG. 6 is a cross-sectional view of another AA of the photosensitive module of FIG. 2;
FIG. 7 is a diagram illustrating a relative position relationship between a microlens and a second transparent layer and a first transparent layer in the photosensitive module of FIG. 2;
FIG. 8 is a cross-sectional view of another AA of the photosensitive module of FIG. 2;
fig. 9 is a schematic view of a display device according to an embodiment of the invention;
fig. 10 shows a BB cross section of the display device of fig. 9.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a cross-sectional view of a photo sensor module provided in the related art, and referring to fig. 1, the photo sensor module includes a substrate 10', a photo sensing unit 20', a light transmitting hole 30', a first light transmitting layer 40', and a micro lens 50'. The light is emitted from the micro-lens 50' into the light passing hole 30' and then transmitted to the light sensing unit 20 '. In the related art, the light receiving amount of a single light sensing unit in the photo module is determined by the amount of light incident from the micro lens 50', that is, the light receiving range is equivalent to the range defined by the bottom profile of the micro lens, and only the light incident into the range defined by the bottom profile of the micro lens can be recognized by the light sensing unit. Therefore, how to further increase the light receiving range of the photo sensor module and increase the light sensing amount of the photo sensor unit becomes one of the technical problems to be solved at the present stage.
The following detailed description is to be read in connection with the drawings and the detailed description.
Fig. 2 is a top view of a photosensitive module according to an embodiment of the invention, fig. 3 is an AA cross-sectional view of the photosensitive module in fig. 2, referring to fig. 2 and fig. 3, an embodiment of the invention provides a photosensitive module 100, including:
a base substrate 10;
a light sensing unit 20 disposed at one side of the substrate base 10;
a light-passing hole 30 disposed on a side of the light sensing unit 20 away from the substrate 10, the light-passing hole 30 overlapping with the light sensing unit 20 along a direction perpendicular to the substrate 10;
a first light-transmitting layer 40 and a second light-transmitting layer 60 disposed at a side of the light-transmitting hole 30 away from the light sensing unit 20, wherein the second light-transmitting layer 60 is located at a side of the first light-transmitting layer 40 away from the light sensing unit 20; the second light-transmitting layer 60 includes a first light-transmitting region 61 and a second light-transmitting region 62, the orthographic projection of the first light-transmitting region 61 on the substrate 10 overlaps the light-passing hole 30, and the orthographic projection of the second light-transmitting region 62 on the substrate 10 does not overlap the light-passing hole 30;
the micro-lenses 50 are arranged on the side, away from the light sensing unit 20, of the second light-transmitting layer 60, and the orthographic projection of the micro-lenses 50 on the second light-transmitting layer 60 is overlapped with the first light-transmitting areas 61;
the refractive index of the second light-transmitting region 62 of the second light-transmitting layer 60 is n0, and the refractive index of the first light-transmitting layer 40 is n1, where 1 < n0 < n1.
It should be noted that fig. 2 only illustrates a top view of the photosensitive module 100, and shows a part of the microlenses 50 in the photosensitive module 100, and does not represent the actual number and size of the microlenses 50. FIG. 3 is also only a schematic diagram of the film structure of the photosensitive module 100, and does not represent the actual size of each film. In addition, fig. 3 also only shows the film structure related to the present invention, and other specific films included in the photosensitive module 100 are not shown in detail. Optionally, a circuit function layer (not shown in the figure) is further disposed between the light sensing unit 20 and the substrate base plate 10, the circuit function layer includes a plurality of transistors, and the light sensing unit 20 is electrically connected to the circuit function layer. It is to be understood that the structure of the circuit function layer electrically connected to the light sensing unit 20 can refer to the structure of the circuit function layer in the prior art, and the present invention will not be described in detail herein.
Specifically, referring to fig. 2 and 3, the photo module 100 of the present invention includes a light sensing unit 20 disposed on one side of the substrate 10, wherein the light sensing unit 20 is used for sensing light and performing light sensing identification according to the amount of the sensed light. A light passing hole 30 is provided on a side of the light sensing unit 20 away from the substrate base plate 10, and light is transmitted into the light sensing unit 20 through the light passing hole 30. A first light-transmitting layer 40 and a second light-transmitting layer 60 are disposed on a side of the light-passing hole 30 away from the light sensing unit 20, and the first light-transmitting layer 40 is located between the second light-transmitting layer 60 and the light sensing unit 20. The micro-lenses 50 are disposed on a side of the second light-transmitting layer 60 away from the first light-transmitting layer 40, and the micro-lenses 50 are configured to converge light, and the converged light is transmitted to the light-transmitting holes 30 through the second light-transmitting layer 60 and the first light-transmitting layer 40, and then transmitted to the light-sensing units 20.
In particular, in the present invention, the second light-transmitting layer 60 is introduced between the microlens 50 and the first light-transmitting layer 40, and the second light-transmitting layer 60 includes a first light-transmitting region 61 coinciding with an orthographic projection of the microlens 50 on the second light-transmitting layer 60 and a second light-transmitting region 62 not overlapping the microlens 50, that is, the first light-transmitting region 61 is a region directly below the microlens 50, and the second light-transmitting region 62 is a region other than the first light-transmitting region 61 in the second light-transmitting layer 60. The refractive index of the second light-transmitting layer 60 in the second light-transmitting region 62 is set to be greater than 1 (i.e., the refractive index of air) and smaller than the refractive index of the first light-transmitting layer 40, and when light rays around the microlens 50 are incident into the light-transmitting hole 30 from the air, the critical incident point of the photosensitive module changes, which means that the light rays incident into the photosensitive module from the point can be just transmitted to the light-transmitting hole 30 and received by the light-sensing unit 20, and the light rays at the side of the critical incident point far away from the microlens 50 cannot be transmitted to the light-transmitting hole 30. In fig. 3, the incident point corresponding to the optical path 1 is a critical incident point of the photosensitive module without the second light-transmitting layer 60, and the incident point corresponding to the optical path 2 is a critical incident point of the photosensitive module after the second light-transmitting layer 60 is disposed, compared with a structure without the second light-transmitting layer in the related art, the critical incident point after the second light-transmitting layer 60 is disposed deviates to a direction away from the microlens 50 in the present invention, that is, the circle range taking the center of the microlens 50 as the center of circle and the distance between the center of the microlens 50 and the critical incident point as the radius is an effective light-receiving range, and the light incident to the light-receiving range can be transmitted to the light-transmitting hole 30 and then received by the light-sensing unit 20 (the light-receiving range in the related art is a circle taking the center of the microlens as the center of circle and the radius of the microlens as the radius).
In an alternative embodiment of the invention, fig. 4 is another AA cross-sectional view of the photosensitive module in fig. 2, and the refractive indexes of the first transparent region 61 and the second transparent region 62 of the second transparent layer 60 are the same. In this embodiment, the overall refractive index of the second light transmitting layers 60 is the same.
Specifically, in the photosensitive module provided in the embodiment of the invention, the refractive indexes of the first light-transmitting region 61 and the second light-transmitting region 62 of the second light-transmitting layer 60 are set to be the same, so that the refractive indexes of the whole second light-transmitting layer 60 are the same, which is favorable for increasing the light-receiving amount of the photosensitive module 100 and also favorable for simplifying the manufacturing of the second light-transmitting layer 60.
Alternatively, the material of the first light-transmitting layer 40 in the present invention may be, for example, OC glue (photoresist), and the refractive index is about 1.5. In the present invention, a transparent material having a refractive index of 1 < n0 < 1.5, such as MgF, may be used for the portion of the second light-transmitting region 62 of the second light-transmitting layer 60 2 Etc. MgF 2 Is about 1.38.
In an alternative embodiment of the invention, with reference to fig. 4, when the refractive indexes of the first transparent region 61 and the second transparent region 62 of the second transparent layer 60 are the same, the portion of the second transparent layer 60 located in the first transparent region 61 and the portion located in the second transparent region 62 are integrally formed.
Specifically, when the overall refractive index of the second light transmission layer 60 is consistent, the first light transmission region 61 and the second light transmission region 62 of the second light transmission layer 60 may be made of the same material, so that the portion of the second light transmission layer 60 located in the first light transmission region 61 and the portion located in the second light transmission region 62 may be integrally formed, for example, the entire second light transmission layer 60 may be manufactured in a uniform coating or deposition manner, and the portions corresponding to the first light transmission region 61 and the second light transmission region 62 do not need to be manufactured separately, so that the manufacturing complexity of the second light transmission layer 60 is greatly simplified, which is beneficial to simplifying the process and improving the production efficiency.
In an alternative embodiment of the invention, fig. 5 is another AA cross-sectional view of the photosensitive module shown in fig. 2, and the refractive index of the first transparent region 61 of the second transparent layer 60 is n2, where n2= n1. In this embodiment, the refractive indices of the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 and the portion located in the second light-transmitting region 62 are different, and the refractive index of the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 is the same as the refractive index of the first light-transmitting layer 40.
Specifically, fig. 5 illustrates, by different filling, that a portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 and a portion located in the second light-transmitting region 62 are different in refractive index, where the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 and the portion located in the second light-transmitting region 62 are different in refractive index, and the refractive index of the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 is n2, where n2= n1, that is, the refractive index of the first light-transmitting region 61 of the second light-transmitting layer 60 is the same as the refractive index of the first light-transmitting layer 40. Since the refractive index 1 < n0 < n1 of the second transparent region 62 of the second transparent layer 60 is increased, since the light receiving range of the photo module is increased, external light can be incident into the light through hole 30 from the peripheral region of the micro lens 50 (i.e., the partial region of the second transparent region 62 of the second transparent layer 60), thereby increasing the amount of light incident into the photo unit 20. Meanwhile, since the refractive index n2 of the first light transmission region 61 of the second light transmission layer 60 is the same as the refractive index n1 of the first light transmission layer 40, when the light rays incident from the microlens 50 into the first light transmission region 61 of the second light transmission layer 60 are transmitted to the first light transmission layer 40 again, the light rays will not be deflected and lost due to the same refractive index of the two, which is beneficial to further improving the light receiving amount of the light sensing unit 20, and further beneficial to improving the light sensing performance of the light sensing unit 20.
The optical path 3 in fig. 5 represents an optical path when the second light-transmitting layer 60 is not introduced, and the optical path 4 represents an actual optical path after the second light-transmitting layer 60 is introduced. In the embodiment shown in fig. 5, when the second light-transmitting layer 60 is added below the microlens 50, a certain refraction loss is caused, corresponding to the displacement of the exit point of the light emitted from the microlens 50 in fig. 5, and the displacement amount of the light path 4 occurring rightward from the light path 3 is H tan θ 2-H tan θ 3, where H is the thickness of the second light-transmitting layer, θ 2 is the incident angle of the light emitted from the second light-transmitting region 62 of the second light-transmitting layer 60 to the first light-transmitting layer 40, and θ 3 is the maximum incident angle of the light refracted from the second light-transmitting region 62 (the edge of the microlens 50, not passing through the microlens 50) of the second light-transmitting layer 60 to the first light-transmitting layer 40. Assuming that the diameter of the light sensing unit is 6 μm, the vertical height from the side of the light sensing unit close to the substrate to the side of the microlens facing the substrate is 10.7 μm, the diameter of the microlens is 10 μm, assuming that the refractive index n3=1.6 of the microlens and the refractive index n1=1.5 of the first light-transmitting layer, when the second light-transmitting layer is not introduced, θ 3=36.9 ° can be calculated, and in accordance with the law of refraction, sin θ 1/sin36.9 ° = n1/n3, θ 1=64.2 ° can be calculated. When the second light-transmitting layer is introduced, the value of theta 1 is not changed according to the law of refraction. sin θ 1/sin θ 2= n0/1, and assuming that n0=1.38, θ 2=40.71 °. After the introduction of the second light transmitting layer, the added length of the received light is D =2 × H × tan θ 2, assuming H =0.3 μm, the added length of the received light is D =0.52 μm. In fig. 5, the displacement of the optical path 4 to the right from the optical path 3 is H × tan θ 2-H × tan θ 3=0.03 μm, so the light receiving loss is much smaller than the light receiving length 0.52 μm, and therefore, even if there is a certain light loss after the second light transmitting layer is added, the light loss is much smaller than the increased light receiving amount, which is beneficial to improving the light receiving amount of the entire photosensitive module.
In an alternative embodiment of the invention, referring to fig. 6, fig. 6 is another cross-sectional view AA of the photosensitive module shown in fig. 2, in which a portion of the second transparent layer 60 located in the first transparent region 61 is integrally formed with the first transparent layer 40.
Specifically, when the refractive indexes of the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 and the first light-transmitting layer 40 are the same, the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 and the first light-transmitting layer 40 may be made of the same material, for example, both made of OC glue. In the actual manufacturing process, after the first light-transmitting layer 40 is manufactured, a portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 is manufactured on the side of the first light-transmitting layer 40 away from the light sensing unit 20, and the film layer relationship between the first light-transmitting layer and the second light-transmitting layer can be shown in fig. 5. Fig. 6 is different from fig. 5 in that, in fig. 6, a portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 is integrally formed with the first light-transmitting layer 40, that is, when the first light-transmitting layer 40 is manufactured, the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 can be manufactured together without separate manufacturing, which is beneficial to simplifying the manufacturing process of the photosensitive module and improving the production efficiency, and is beneficial to reducing or avoiding light loss generated when light is transmitted from the first light-transmitting region 61 of the second light-transmitting layer 60 to the first light-transmitting layer 40, thereby being beneficial to improving the light-receiving amount of the light sensing unit 20.
In an alternative embodiment of the invention, fig. 7 is a diagram illustrating a relative position relationship between the micro-lenses 50, the second light-transmitting layer 60 and the first light-transmitting layer 40 in the photosensitive module shown in fig. 2, and fig. 7 illustrates a light propagation path. The refractive index of the first light-transmitting region 61 of the second light-transmitting layer 60 is n2, the refractive index of the microlens 50 is n3, and the refractive index of the first light-transmitting layer 40 is n1, where n2 > n3 > n1. In this embodiment, the refractive indices of the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 and the portion located in the second light-transmitting region 62 are different, and the refractive index n2 of the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 is greater than the refractive index n3 of the microlens 50 and the refractive index n1 of the first light-transmitting layer 40.
Specifically, referring to fig. 7, fig. 7 illustrates, by different filling, a first light-transmitting region 61 and a second light-transmitting region 62 in a second light-transmitting layer 60, where the second light-transmitting layer 60 is located between the microlens 50 and the first light-transmitting layer 40, a refractive index n2 of a portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 is greater than a refractive index n3 of the microlens 50, and a refractive index n3 of the microlens 50 is greater than a refractive index n1 of the first light-transmitting layer 40, when light is transmitted from the microlens 50 to the second light-transmitting layer 60, an exit point of the light transmitted from the second light-transmitting layer 60 to the first light-transmitting layer 40 is shifted compared to a point when the second light-transmitting layer 60 is not provided, an optical path 5 in fig. 7 is an optical path when the second light-transmitting layer 60 is not provided, that is an actual optical path 6 after the second light-transmitting layer 60 is provided, that the optical path 6 is inward compared to the optical path 5 after the light is incident into the first light-transmitting layer 40, that an angle of the optical path 6 is smaller than an angle of the optical path 5, and that the optical path 6 is shifted inward compared to the optical path, which is advantageous for increasing a light-sensing light-receiving capacity of the optical module, and therefore, that the light-receiving unit is increased by the present invention.
Optionally, with continued reference to fig. 7, the refractive index n3 of the microlens 50 is about 1.6, when the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 is greater than the refractive index of the microlens 50, the material of the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 may be a light-transmitting material having a refractive index greater than 1.6, such as ITO (indium tin oxide), the refractive index of ITO is about 2, although in some other embodiments of the present invention, the material of the portion of the second light-transmitting layer 60 located in the first light-transmitting region 61 may also be another light-transmitting material with a feasible refractive index, which is not particularly limited in this invention.And the refractive index of the portion of second light-transmitting region 60 located in second light-transmitting region 62 is 1 < n0 < n1, which may be a material having a refractive index of between 1 and 1.5, such as MgF 2 (refractive index is about 1.38), etc., however, in some other embodiments of the present invention, the portion of the second light-transmitting layer 60 located in the second light-transmitting region 62 may also be made of other light-transmitting materials with feasible refractive indexes, which is not particularly limited by the present invention.
In an alternative embodiment of the present invention, fig. 8 is a cross-sectional view of another AA of the light sensing module 100 in fig. 2, wherein the light passing hole 30 includes at least two sub light passing holes, and the aperture of the sub light passing holes decreases along the direction that the micro lens 50 points to the light sensing unit 20.
Specifically, the sub light-passing holes in the photosensitive module 100 provided in the embodiment of the present invention can be understood as collimating holes, and after light enters the sub light-passing holes, the sub light-passing holes can gather the light to a certain extent, and when the gathered light is transmitted to the photosensitive unit 20, the photosensitive performance of the photosensitive unit 20 is improved. The principle that the sub light-passing holes can converge light is that the inner walls of the sub light-passing holes are made of shading materials, such as black matrix materials. Referring to fig. 8, this embodiment shows that the same light sensing unit 20 corresponds to 3 sub light passing holes, namely, sub light passing holes k1, k2 and k3, each of which is surrounded by a light shielding material, and since fig. 8 is a cross-sectional view, only a portion of the light shielding material forming the sub light passing holes is shown, and in a top view, the sub light passing holes may be embodied as circles. Among the sub light-passing holes, the sub light-passing hole k1 closest to the microlens 50 has the largest diameter in the direction perpendicular to the substrate base plate 10, thereby being beneficial to increasing the light-receiving range; the sub light-passing hole k3 farthest from the microlens 50 has the smallest diameter, and the diameter of the sub light-passing hole may show a decreasing trend from the microlens 50 to the direction of the light sensing unit 20, thereby realizing the convergence effect on the light. The amount of light incident into the sub light-passing holes is increased, light is also favorably converged, and the converged light is transmitted to the light sensing unit 20, so that the light sensing performance of the light sensing unit 20 can be effectively improved.
It should be noted that, the drawings of the present invention only show that one light sensing unit 20 corresponds to 2 or 3 sub light transmission holes, in some other embodiments of the present invention, one light sensing unit 20 may also correspond to more than 3 sub light transmission holes, and the present invention is not limited in this respect.
In an alternative embodiment of the present invention, the axes of the sub light transmission holes coincide. Specifically, when the same light sensing unit 20 corresponds to 2 or more light passing holes 30, the axes of the sub light passing holes are overlapped, so that different light passing holes 30 can be formed respectively by using the same central axis as a reference, which is not only beneficial to realizing the convergence of light, but also beneficial to simplifying the manufacturing process of different light passing holes 30.
In an alternative embodiment of the present invention, referring to fig. 8, a material filled in each sub light transmitting hole is the same as a material of the first light transmitting layer 40, and a refractive index of the material filled in each sub light transmitting hole is the same as a refractive index of the first light transmitting layer 40.
Specifically, in the present invention, each sub light transmitting hole is filled with a material having the same refractive index as that of the first light transmitting layer 40, and when light enters the sub light transmitting hole from the first light transmitting layer 40, the light path is not deflected due to the change of the refractive index, which is advantageous for ensuring the amount of light transmitted from the light transmitting hole 30 to the light sensing unit 20. In addition, when the material identical to the material of the first light-transmitting layer 40 is filled in each sub light-transmitting hole, for example, OC glue is used, which is beneficial to ensure the consistency between the refractive index of the material in the sub light-transmitting hole and the refractive index of the material in the first light-transmitting layer 40, and is beneficial to make the light transmittance of the first light-transmitting layer 40 and each light-transmitting hole 30 more uniform, and is beneficial to simplify the material types of the film layers of the photosensitive module 100.
Optionally, in a direction perpendicular to the substrate 10, the material between two adjacent sub light transmission holes and the material between the light sensing unit 20 and the sub light transmission holes may also be the same as the material of the first light transmission layer 40, for example, both of the materials are OC materials, so as to further simplify the material types of the respective layers in the light sensing module 100.
In an alternative embodiment of the invention, referring to fig. 7, the thickness of the second transparent layer 60 is H along a direction perpendicular to the substrate 10, wherein H is greater than or equal to 0.1 μm and less than or equal to 0.7 μm.
Specifically, referring to fig. 7, it is assumed that θ 1 is an incident angle from air to the second transparent region 62 of the second transparent layer 60, θ 2 is an incident angle from the second transparent region 62 of the second transparent layer 60 to the first transparent layer 40, and θ 3 is a maximum incident angle refracted from the second transparent region 62 (edge of the microlens 50, not passing through the microlens 50) of the second transparent layer 60 into the first transparent layer 40.
When the refractive indexes of the first light transmission region 61 and the second light transmission region 62 of the second light transmission layer 60 are the same, the light absorption length that can be increased by this scheme is D =2 × H × tan θ 2- (H × tan θ 2-H × tan θ 3) = H × tan θ 2+ H tan θ 3. When the refractive index of the first light-transmitting region 61 of the second light-transmitting layer 60 is the same as the refractive index of the first light-transmitting layer 40, or the refractive index of the first light-transmitting region 61 of the second light-transmitting layer 60 is larger than the refractive index of the microlens 50, the light receiving length that can be increased is D =2 × h × tan θ 2. It can be seen that the thickness H of the second transparent layer 60 is positively correlated to the increased light receiving length of the photo module 100, and the greater the thickness, the better the light receiving amount of the photo unit 20 is. In consideration of the process feasibility of manufacturing the second light-transmitting layer 60 in the photosensitive module 100, the thickness of the second light-transmitting layer 60 is set to be 0.1 μm or more and H or less than 0.7 μm, so as to improve the overall light-receiving amount of the photosensitive module 100. It is considered that when H is less than 0.1 μm, the difficulty of fabricating the film layer is large, and when H is greater than 0.7 μm, the thickness of the film layer is large, which results in an increase in the overall thickness of the photosensitive module 100. Therefore, when H is greater than or equal to 0.1 μm and less than or equal to 0.7 μm, the light receiving amount of the photosensitive module 100 can be increased, the manufacturing process of the second light-transmitting layer 60 can be simplified, and the influence on the overall thickness of the photosensitive module 100 can be avoided. Optionally, the thickness of the second light-transmitting layer 60 is 0.2 μm H0.6 μm, or 0.3 μm H0.5 μm.
In an alternative embodiment of the present invention, the light sensing unit 20 is a fingerprint sensor. In the fingerprint identification process, the amount of light rays which can be received by the fingerprint identification sensor directly influences the fingerprint identification performance, and the embodiment of the invention effectively increases the light receiving amount of the fingerprint identification sensor by introducing the second light transmitting layer 60 between the micro lens 50 and the first light transmitting layer 40 and specially designing the refractive index of the part of the second light transmitting layer 60, which is positioned in the second light transmitting area 62, thereby being beneficial to improving the accuracy and the sensitivity of the fingerprint identification.
Based on the same inventive concept, the present invention further provides a display device 200, fig. 9 is a schematic diagram of the display device 200 according to the embodiment of the present invention, fig. 10 is a BB cross-sectional diagram of the display device 200 shown in fig. 9, please refer to fig. 9 and fig. 10, the display device 200 according to the embodiment of the present invention includes a display panel 300 and the photosensitive module 100 according to the embodiment of the present invention, and the photosensitive module 100 is located on a side of the display panel 300 away from a light emitting surface thereof. Referring to fig. 3, the second transparent layer 60 is introduced between the microlens 50 and the first transparent layer 40 of the photosensitive module 100, and the specific refractive index is set for the second transparent region 62 of the second transparent layer 60, so as to increase the light receiving range of the photosensitive module 100 in the display device 200, and thus increase the amount of light received by the light sensing unit 20, thereby improving the photosensitive performance of the display device 200. When sensitization module 100 embodies for the fingerprint identification module, be favorable to promoting display device 200's fingerprint identification's precision and sensitivity.
Optionally, in the display device 200 provided in the embodiment of the present invention, the display panel 300 is an organic electroluminescent display panel 300, and the photosensitive module 100 is located on a back surface of the display panel 300 to form an under-screen photosensitive module 100, such as an under-screen fingerprint identification module. The light that touches the main part for example finger reflection can reach sensitization module through display panel 300 side, and sensitization design easily appears under the screen among the prior art under the light receiving amount, leads to the valley of fingerprint and the ridge is not clear, influences fingerprint identification's accuracy. The design of the invention effectively increases the light receiving quantity, thereby being beneficial to improving the accuracy of fingerprint identification.
It should be noted that, in the embodiment of the display device 200 provided in the embodiment of the present invention, reference may be made to the embodiment of the photosensitive module 100, and repeated descriptions are not repeated. The display device provided by the invention can be as follows: any product or component with practical functions such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
In summary, the photosensitive module and the display device provided by the invention at least achieve the following beneficial effects:
in the photosensitive module and the display device comprising the photosensitive module, the photosensitive module comprises a light sensing unit arranged on one side of a substrate, and the light sensing unit is used for sensing light and carrying out light sensing identification according to the amount of the sensed light. One side of the light sensing unit, which is far away from the substrate base plate, is provided with a light through hole, and light is transmitted to the light sensing unit through the light through hole. And a first euphotic layer and a second euphotic layer are arranged on one side of the light through hole far away from the light sensing unit, and the first euphotic layer is positioned between the second euphotic layer and the light sensing unit. And a micro lens is arranged on one side of the second light-transmitting layer, which is far away from the first light-transmitting layer, and is used for transmitting light rays to the light-transmitting hole through the second light-transmitting layer and the first light-transmitting layer after the light rays are converged, and further transmitting the light rays to the light sensing unit. Particularly, in the invention, a second light transmitting layer is introduced between the microlens and the first light transmitting layer, the second light transmitting layer comprises a first light transmitting area superposed with the orthographic projection of the microlens on the second light transmitting layer and a second light transmitting area not overlapped with the microlens, the refractive index of the second light transmitting layer in the second light transmitting area is larger than 1 and smaller than that of the first light transmitting layer, when light rays around the microlens are emitted into the light through hole from air, the critical incident point is changed, compared with the situation that the second light transmitting layer is not arranged, the critical incident point after the second light transmitting layer is arranged is deviated towards the direction far away from the microlens, the light receiving amount of the photosensitive module is increased, the light quantity sensed by the photosensitive unit is increased, and the photosensitive performance of the photosensitive module and the display device comprising the photosensitive module is improved.
Although some specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A photosensitive module, comprising:
a substrate base plate;
a light sensing unit disposed at one side of the substrate;
the light through hole is formed in one side, far away from the substrate, of the light sensing unit, and is overlapped with the light sensing unit along the direction perpendicular to the substrate;
the first light-transmitting layer and the second light-transmitting layer are arranged on one side, away from the light sensing unit, of the light-transmitting hole, wherein the second light-transmitting layer is located on one side, away from the light sensing unit, of the first light-transmitting layer; the second light-transmitting layer comprises a first light-transmitting area and a second light-transmitting area, the orthographic projection of the first light-transmitting area on the substrate is overlapped with the light through hole, and the orthographic projection of the second light-transmitting area on the substrate is not overlapped with the light through hole;
the micro lens is arranged on one side, away from the light sensing unit, of the second light transmitting layer, and the orthographic projection of the micro lens on the second light transmitting layer is overlapped with the first light transmitting area;
the refractive index of a second light-transmitting region of the second light-transmitting layer is n0, the refractive index of the first light-transmitting layer is n1, and n0 is more than 1 and less than n1;
the refractive index of the first light transmitting region of the second light transmitting layer is n2, wherein n2= n1; or the refractive index of the first light transmission region of the second light transmission layer is n2, and the refractive index of the microlens is n3, wherein n2 is more than n3 and more than n1.
2. The photosensitive module of claim 1 wherein the refractive index of the first and second transparent regions of the second transparent layer is the same.
3. The photosensitive module of claim 2, wherein the portion of the second transparent layer located in the first transparent region and the portion located in the second transparent region are integrally formed.
4. The photosensitive module of claim 1, wherein when the refractive index of the first transparent region of the second transparent layer is n2, and n2= n1, the portion of the second transparent layer located in the first transparent region is integrally formed with the first transparent layer.
5. The photosensitive module of claim 1, wherein the light passing holes comprise at least two sub light passing holes, and the aperture of each of the sub light passing holes decreases along a direction in which the microlens is directed to the photosensitive unit.
6. The photosensitive module of claim 5, wherein the axes of the sub light-passing holes coincide.
7. The photosensitive module according to claim 5, wherein a material filled in each of the sub light holes is the same as a material of the first light-transmitting layer, and a refractive index of the material filled in each of the sub light holes is the same as a refractive index of the first light-transmitting layer.
8. The photosensitive module of claim 1, wherein the second light-transmitting layer has a thickness H in a direction perpendicular to the substrate, and wherein H is 0.1 μm or less and H is 0.7 μm or less.
9. The photosensitive module according to claim 1, wherein the photosensitive unit is a fingerprint sensor.
10. A display device, comprising a display panel and the photosensitive module of any one of claims 1 to 9, wherein the photosensitive module is located on a side of the display panel away from a light emitting surface of the display panel.
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| JP2007264640A (en) * | 2007-04-05 | 2007-10-11 | Sharp Corp | Manufacturing method for display panel |
| CN110164307A (en) * | 2019-05-23 | 2019-08-23 | 厦门天马微电子有限公司 | A kind of display device being built-in with fingerprint recognition inductor |
| CN111666929A (en) * | 2020-07-31 | 2020-09-15 | 厦门天马微电子有限公司 | Display device |
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| JP2007264640A (en) * | 2007-04-05 | 2007-10-11 | Sharp Corp | Manufacturing method for display panel |
| CN110164307A (en) * | 2019-05-23 | 2019-08-23 | 厦门天马微电子有限公司 | A kind of display device being built-in with fingerprint recognition inductor |
| CN111666929A (en) * | 2020-07-31 | 2020-09-15 | 厦门天马微电子有限公司 | Display device |
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