阅读说明：本技术 显示装置以及移动装置 (Display device and mobile device ) 是由 陈明煌 简传枝 张韵欣 姚怡安 于 2020-05-07 设计创作，主要内容包括：本揭露提供一种显示装置以及移动装置。显示装置包括显示面板、背光模块以及切换式扩散器。背光模块具有第一区以及第二区。背光模块包括反射片以及多个光学层。反射片具有在第一区中的非反射部以及在第二区中的反射部。多个光学层设置在反射片上。切换式扩散器设置在显示面板与背光模块之间。多个光学层中的至少一个在第一区与第二区中包括不同的结构。(The present disclosure provides a display device and a mobile device. The display device comprises a display panel, a backlight module and a switching type diffuser. The backlight module is provided with a first area and a second area. The backlight module comprises a reflecting sheet and a plurality of optical layers. The reflective sheet has a non-reflective portion in the first region and a reflective portion in the second region. A plurality of optical layers are disposed on the reflective sheet. The switching diffuser is arranged between the display panel and the backlight module. At least one of the plurality of optical layers includes a different structure in the first region and the second region.)

1. A display device, comprising:

a display panel;

the backlight module is provided with a first area and a second area, and the backlight module comprises:

a reflective sheet having a non-reflective portion in the first region and a reflective portion in the second region; and

a plurality of optical layers disposed on the reflective sheet; and

a switching diffuser disposed between the display panel and the backlight module,

wherein at least one of the plurality of optical layers comprises a different structure in the first region and the second region.

2. The display device of claim 1, wherein the at least one of the plurality of optical layers comprises an unpatterned structure in the first region.

3. The display device according to claim 2, wherein the at least one of the plurality of optical layers is one of a light guide plate, a prism sheet, and a diffusion sheet.

4. The display device according to claim 1, wherein another of the plurality of optical layers comprises an opening in the first region.

5. The display device of claim 4, wherein the other of the plurality of optical layers is a diffuser.

6. The display device according to claim 1, wherein the backlight module further comprises:

a shading element disposed in the second region and proximate to a periphery of the first region.

7. A mobile device, comprising:

a display device, comprising:

a display panel;

the backlight module is provided with a first area and a second area, and the backlight module comprises:

a reflective sheet having a non-reflective portion in the first region and a reflective portion in the second region; and

a plurality of optical layers disposed on the reflective sheet; and

a switching diffuser disposed between the display panel and the backlight module,

wherein at least one of the plurality of optical layers comprises a different structure in the first region and the second region; and

and the optical sensor is arranged corresponding to the first area.

8. The mobile device of claim 7, further comprising:

a light emitting unit adjacent to the optical sensor.

9. The mobile device of claim 7, wherein the at least one of the plurality of optical layers comprises an unpatterned structure in the first region.

10. The mobile device of claim 9, wherein the at least one of the plurality of optical layers is one of a light guide plate, a prism sheet, and a diffuser sheet.

Technical Field

The disclosure relates to a display device and a mobile device.

Background

The conventional display device is mainly provided with a front lens module by forming a groove on the front surface of a screen. This approach not only causes difficulties in module design, but also sacrifices display area, and full-screen display cannot be realized.

Disclosure of Invention

The disclosure provides a display device and a mobile device, which can realize full screen display.

According to an embodiment of the present disclosure, a display device includes a display panel, a backlight module, and a switching diffuser. The backlight module is provided with a first area and a second area. The backlight module comprises a reflecting sheet and a plurality of optical layers. The reflective sheet has a non-reflective portion in the first region and a reflective portion in the second region. A plurality of optical layers are disposed on the reflective sheet. The switching diffuser is arranged between the display panel and the backlight module. At least one of the plurality of optical layers includes a different structure in the first region and the second region.

According to an embodiment of the present disclosure, a mobile device includes a display device and an optical sensor. The display device comprises a display panel, a backlight module and a switching type diffuser. The backlight module is provided with a first area and a second area. The backlight module comprises a reflecting sheet and a plurality of optical layers. The reflective sheet has a non-reflective portion in the first region and a reflective portion in the second region. A plurality of optical layers are disposed on the reflective sheet. The switching diffuser is arranged between the display panel and the backlight module. At least one of the plurality of optical layers includes a different structure in the first region and the second region. The optical sensor is disposed corresponding to the first region.

Based on the above, in the embodiments of the present disclosure, the optical sensor disposed corresponding to the first region can perform image acquisition (e.g., photographing or filming) by performing a partitioned structural design on the film layer or the element in the backlight module. In addition, the switching diffuser is used for shielding the optical sensor arranged corresponding to the first area or improving the phenomenon that at least one of the optical layers has different structures in the first area and the second area, so that light beams are uneven at the boundary of the first area and the second area, and the visual effect difference between the first area and the second area is favorably reduced. Therefore, the display device and the mobile device of the embodiment of the disclosure can realize full-screen display.

In order to make the aforementioned and other features and advantages of the disclosure more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 to 6 are partial cross-sectional schematic views of a mobile device according to various embodiments of the present disclosure.

Detailed Description

The present disclosure may be understood by reference to the following detailed description taken in conjunction with the accompanying drawings. It should be noted that in order to facilitate the understanding of the reader and the simplicity of the drawings, the various drawings in the present disclosure depict only a portion of an electronic device or display device and certain elements of the drawings are not necessarily drawn to scale. In addition, the number and size of the elements in the figures are merely illustrative and are not intended to limit the scope of the present disclosure. For example, the relative sizes, thicknesses, and locations of various layers, regions, or structures may be reduced or exaggerated for clarity.

Certain terms are used throughout the description and following claims to refer to particular elements. Those skilled in the art will appreciate that electronic device manufacturers may refer to the same components by different names. This document does not intend to distinguish between components that differ in function but not name. In the following description and claims, the terms "having" and "including" are used as open-ended terms, and thus should be interpreted to mean "including, but not limited to …".

Directional phrases used herein include, for example: "upper", "lower", "front", "rear", "left", "right", etc., refer only to the orientation of the figures. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting. It will be understood that when an element or layer is referred to as being "on" or "connected to" another element or layer, it can be directly on or connected to the other element or layer or intervening elements or layers may be present (not directly). In contrast, when an element or layer is referred to as being "directly on" or "directly connected to" another element or layer, there are no intervening elements or layers present therebetween.

The terms "about," "equal," "identical," "substantially," or "approximately" as referred to herein generally represent a range of 10% of a given value or range, or 5%, 3%, 2%, 1%, or 0.5% of the given value or range. Further, the phrase "a given range is from a first value to a second value," and "a given range is within a range from a first value to a second value" means that the given range includes the first value, the second value, and other values therebetween.

In some embodiments of the present disclosure, terms such as "connected," "interconnected," and the like, with respect to bonding, connecting, and the like, may refer to two structures being in direct contact, or may also refer to two structures not being in direct contact, unless otherwise specified, with respect to the structure between which they are disposed. The terms coupled and connected should also be construed to include both structures being movable or both structures being fixed. Furthermore, the terms "electrically connected" and "coupled" encompass any direct and indirect electrical connection.

In the following embodiments, the same or similar elements will be denoted by the same or similar reference numerals, and the detailed description thereof will be omitted. Furthermore, the features of the various embodiments may be combined in any suitable manner without departing from the spirit or conflict of the invention, and all such modifications and equivalents as may be within the spirit and scope of the disclosure are deemed to be within the ambit and scope of the disclosure. In addition, the terms "first", "second", and the like in the description and the claims are only used for naming different elements or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit of the number of elements, nor are they used for limiting the manufacturing order or the arrangement order of the elements.

The electronic device (or mobile device) of the present disclosure may include a display device, an antenna device, a sensing device, a light-emitting device, or a splicing device, but is not limited thereto. The electronic device (or mobile device) may include a bendable or flexible electronic device. The electronic device (or mobile device) may for example comprise a liquid crystal (liquid crystal) layer or a light emitting diode. The light emitting diode may include, for example, an Organic Light Emitting Diode (OLED), a submillimeter light emitting diode (mini LED), a micro light emitting diode (micro LED), or a quantum dot light emitting diode (quantum dot LED, which may include QLED, QDLED), a fluorescent (fluorescent), a phosphorescent (phosphor), or other suitable material, or a combination thereof, but is not limited thereto.

Fig. 1 to 6 are partial cross-sectional schematic views of a mobile device 1 according to various embodiments of the present disclosure. The mobile device 1 of the present disclosure may include a mobile phone, a tablet computer, a notebook computer, or an intelligent bracelet, but is not limited thereto. The mobile device 1 has an image acquisition mode in addition to a general display mode, and the mobile device 1 can be switched between the display mode and the image acquisition mode.

Referring to fig. 1, the mobile device 1 may include a display device 10 and an optical sensor 12. The display device 10 is adapted to provide a display screen. For example, the display device 10 may include a display panel 100, a backlight module 102, and a switching diffuser 104.

The display panel 100 may be a non-self-luminous display panel, such as a liquid crystal display panel, a QDCF display panel, but not limited thereto. The liquid crystal display panel may include an active device array substrate (not shown), an opposite substrate (not shown), and a liquid crystal layer (not shown) disposed between the active device array substrate and the opposite substrate, but is not limited thereto.

The backlight module 102 is adapted to provide light beams, and the backlight module 102 may have a first region R1 and a second region R2, and the first region R1 may be penetrated by light beams outside the display device 10. In the display mode, the first region R1 and the second region R2 provide light beams to the display panel 100 together to achieve full-screen display. In the image acquisition mode, a light beam outside the display device 10 enters the mobile device 1 via the first region R1 and is received by the optical sensor 12. The shape of the first region R1 may be circular, triangular, quadrilateral, pentagonal, or other polygonal shape, as viewed from a top view (not shown) of the mobile device 1. The second region R2 is connected to the first region R1, and the second region R2 is located, for example, at the periphery of the first region R1. For example, the second region R2 may surround the first region R1, or the second region R2 may be located at one side, both sides, or more sides of the first region R1.

The backlight module 102 may be a side-in type backlight module to meet the trend of thinning, but not limited thereto. Taking the edge-type backlight module as an example, the backlight module 102 may include a reflective sheet 1020, a plurality of optical layers (such as the optical layer 1022, the optical layer 1024, and the optical layer 1026), and a light emitting unit 1028, but not limited thereto.

The reflective sheet 1020 is disposed adjacent to the bottom of the display panel 100, and the reflective sheet 1020 has a non-reflective portion PNR in the first region R1 and a reflective portion PR in the second region R2. The reflection portion PR is adapted to reflect the light beam transmitted toward the bottom of the display device 10, so that the light beam is transmitted toward the display panel 100, thereby improving the light utilization rate. For example, the reflective portion PR may include a metal thin film, or the reflective portion PR may include a combination of a light-transmitting substrate (not shown) and a reflective layer (not shown) formed on the light-transmitting substrate. The material of the transparent substrate may include plastic, such as Polyethylene terephthalate (PET), but not limited thereto. The material of the reflective layer may include, but is not limited to, metal, alloy, or a combination thereof.

The non-reflection portion PNR is adapted to pass a light beam therethrough so that the optical sensor 12 can receive the light beam outside the display device 10. For example, the non-reflective portion PNR may be an opening H penetrating the reflective sheet 1020. In other words, the reflective sheet 1020 may form an opening H in the first region R1, and the opening H is used as the non-reflective portion PNR, but not limited thereto.

A plurality of optical layers are disposed on the reflective sheet 1020. FIG. 1 schematically shows three optical layers, such as optical layer 1022, optical layer 1024, and optical layer 1026, wherein optical layer 1022, optical layer 1024, and optical layer 1026 are sequentially stacked on reflector sheet 1020. However, the number of optical layers included in the backlight module 102 may be increased or decreased as required, and the stacking order of the optical layers may be changed as required.

In some embodiments, the optical layer 1022 may be a light guide plate. The light guide plate includes a light transmissive body 1022B. The light transmissive body 1022B has a light incident surface SI, a light emitting surface SE, and a bottom surface SB. The light incident surface SI is located on the side surface of the light transmissive body 1022B and connected to the light emitting surface SE and the bottom surface SB. The light-emitting surface SE and the bottom surface SB are opposite to each other, and the bottom surface SB is located between the light-emitting surface SE and the reflective sheet 1020.

The light emitting unit 1028 is disposed adjacent to the light incident surface SI. The number of the light emitting units 1028 included in the backlight module 102 may be one or more. For example, the light emitting unit 1028 may include a light tube or a light bar (light bar) extending in the second direction D2. The light bar may include a plurality of light emitting elements (not shown) arranged in the second direction D2. The light emitting element may include, but is not limited to, an organic light emitting diode, a sub-millimeter light emitting diode, a micro light emitting diode, or a quantum dot light emitting diode, a fluorescent, phosphorescent, or other suitable material, or a combination thereof. The light beam (not shown) emitted from the light emitting unit 1028 enters the light guide plate from the light incident surface SI. The light beam entering the light guide plate is transmitted in a direction away from the light incident surface SI (e.g., a direction opposite to the first direction D1) by Total Internal Reflection (TIR). The first direction D1 and the second direction D2 are perpendicular to the normal direction D3 of the mobile device 1, and the first direction D1 and the second direction D2 intersect with each other. As shown in fig. 1, the first direction D1 and the second direction D2 may be perpendicular to each other, but not limited thereto.

The light guide plate may further include a plurality of dots 1022P. A plurality of dots 1022P are disposed on the bottom surface SB of the light transmissive body 1022B. In some embodiments, a plurality of dots 1022P can be formed on the bottom surface SB of the light-transmitting body 1022B in a printing manner, but not limited thereto. The dots 1022P are adapted to break the total internal reflection, so that the light beam transmitted in the light guide plate is output from the light exit surface SE.

In some embodiments, a plurality of dots 1022P may be located in the second region R2, and the distribution density of the plurality of dots 1022P in the second region R2 may vary according to the distance from the light incident surface SI. For example, in the second region R2, the farther away from the light incident surface SI, the more densely arranged the dots 1022P are, so as to improve the uniformity of the emitted light, but not limited thereto.

The light guide plate may further include a plurality of microstructures 1022M. The microstructures 1022M are disposed on the light exit surface SE of the light transmissive body 1022B. In some embodiments, the plurality of microstructures 1022M and the light-transmissive body 1022B can be integrally formed, for example, the plurality of microstructures 1022M and the light-transmissive body 1022B can be formed by die casting, but not limited thereto. In addition, the material of the microstructures 1022M and the light-transmitting body 1022B of the light guide plate may include polymethyl methacrylate (PMMA), Polycarbonate (PC), or glass, but not limited thereto.

In some embodiments, the plurality of microstructures 1022M may be located in the second region R2, and the size, pitch (pitch), shape, or the like of the plurality of microstructures 1022M in the second region R2 may be changed according to the requirement. For example, the microstructure 1022M may be a columnar microstructure, wherein a plurality of columnar microstructures may be arranged along the first direction D1, and the columnar microstructure may extend along the second direction D2. In other embodiments, the plurality of columnar microstructures may be arranged along the second direction D2, and the columnar microstructures may extend along the first direction D1.

The optical layer 1022 may include different structures in the first region R1 and the second region R2. As shown in fig. 1, the optical layer 1022 may include an unpatterned structure in the first region R1 and a patterned structure in the second region R2. Herein, at least one of the plurality of optical layers (e.g., optical layer 1022, optical layer 1024, and optical layer 1026) may include an unpatterned structure, which means that structures such as a depressed microstructure, a projected microstructure, an irregularly shaped light scattering microstructure, or light scattering particles are not formed on or in the body (e.g., light transmissive body) of the at least one optical layer, but is not limited thereto. In some embodiments, the unpatterned structure of at least one of the plurality of optical layers (e.g., optical layer 1022, optical layer 1024, and optical layer 1026) can also refer to an opening H' (as shown in fig. 3, 5, 6) formed in the body of the at least one optical layer. On the other hand, at least one of the optical layers (e.g., optical layer 1022, optical layer 1024, and optical layer 1026) may include a patterned structure, which refers to a structure such as a concave microstructure, a convex microstructure, an irregular light scattering microstructure, or a light scattering particle formed on or in the body of the optical layer (e.g., a light-transmissive body), but is not limited thereto. In fig. 1, the optical layer 1022 does not include the dots 1022P or the microstructures 1022M in the first region R1 except for the light-transmissive body 1022B of the light guide plate. On the other hand, the optical layer 1022 includes a plurality of dots 1022P and a plurality of microstructures 1022M in the second region R2 in addition to the light-transmitting body 1022B of the light guide plate. By disposing the dots 1022P or the microstructures 1022M outside the first region R1 (e.g., in the second region R2), light beams outside the display device 10 can be transmitted to the optical sensor 12 advantageously, or stray light can be reduced, thereby improving the quality of images acquired by the optical sensor 12.

In some embodiments, optical layer 1024 may be a diffuser. The diffusion sheet is suitable for diffusing the light beams so as to improve the uniformity of the emergent light. For example, the diffusion sheet may include a light-transmitting body 1024B and a plurality of light-scattering particles 1024P. The light-transmissive body 1024B is adapted to transmit a light beam therethrough. For example, the material of the light-transmitting body 1024B may include polyethylene terephthalate, but is not limited thereto. A plurality of light scattering particles 1024P may be coated on the light transmissive body 1024B or doped in the light transmissive body 1024B to scatter the light beam.

Optical layer 1024 may include different structures in first region R1 and second region R2. As shown in fig. 1, optical layer 1024 may include unpatterned structures in first region R1 and patterned structures in second region R2. Specifically, the optical layer 1024 includes no light scattering particles 1024P in the first region R1 except for the light transmissive body 1024B. On the other hand, the optical layer 1024 includes a plurality of light scattering particles 1024P in the second region R2 in addition to the light transmissive body 1024B. By disposing the light scattering particles 1024P outside the first region R1 (e.g., in the second region R2), the transmission of light beams outside the display device 10 to the optical sensor 12 is facilitated or the formation of stray light can be reduced, thereby contributing to the improvement of the quality of images acquired by the optical sensor 12.

In other embodiments, a diffuser (e.g., optical layer 1024) can include a light transmissive body 1024B. The surface S1024B of the light-transmitting body 1024B may be formed into irregular light-scattering microstructures (not shown) by a surface roughening process. As such, the diffusion sheet may not include the plurality of light scattering particles 1024P. The surface roughening process may be performed only for the surface S1024B in the second region R2; alternatively, the surface roughening process may be performed on the entire surface S1024B, and then the surface S1024B in the first region R1 is subjected to a polishing process or a filling process, so that the optical layer 1024 includes different structures in the first region R1 and the second region R2. The polishing process is, for example, to polish the rough surface into a flat or nearly flat surface by using a polishing machine. The filling process is, for example, to form a transparent material layer on the surface S1024B in the first region R1, so as to change the rugged rough surface into a flat or nearly flat surface. The refractive index of the light-transmitting material layer may be equal to or similar to the refractive index of the light-transmitting body 1024B, but is not limited thereto. For example, the transparent material layer may be an adhesive layer, but not limited thereto.

In some embodiments, the optical layer 1026 can be a prism sheet, such as a Brightness Enhancement Film (BEF), but is not limited thereto. The prism sheet is suitable for correcting a light beam transmission path so as to achieve the effect of concentrating and brightening. For example, the prism sheet may include a light-transmitting body 1026B and a plurality of microstructures 1026M. The light-transmissive body 1026B is adapted to be transparent to the light beam. For example, the material of the light-transmitting body 1026B may include, but is not limited to, polyethylene terephthalate. The microstructures 1026M are disposed on the light-transmissive body 1026B and can modify the transmission path of the light beam by using refraction. In some embodiments, the plurality of microstructures 1026M and the light-transmissive body 1022B can be integrally formed, for example, the plurality of microstructures 1022M and the light-transmissive body 1022B can be formed by die casting, but not limited thereto.

In some embodiments, a plurality of microstructures 1026M may be located in second region R2, and the size, pitch, shape, or the like of the plurality of microstructures 1026M in second region R2 may be changed as desired. For example, the microstructures 1026M can be pillar-shaped microstructures, wherein a plurality of pillar-shaped microstructures can be arranged along the first direction D1, and the pillar-shaped microstructures can extend along the second direction D2. In other embodiments, the plurality of columnar microstructures may be arranged along the second direction D2, and the columnar microstructures may extend along the first direction D1.

Optical layer 1026 may include different structures in first region R1 and second region R2. As shown in fig. 1, the optical layer 1026 may include unpatterned structures in the first region R1 and patterned structures in the second region R2. In fig. 1, optical layer 1026 does not include microstructures 1026M in first region R1 except for light transmissive body 1026B. On the other hand, the optical layer 1026 includes a plurality of microstructures 1026M in the second region R2 in addition to the light-transmitting body 1026B. By disposing the microstructure 1026M outside the first region R1 (e.g., in the second region R2), the transmission of light beams outside the display device 10 to the optical sensor 12 can be facilitated or the formation of stray light can be reduced, thereby contributing to the improvement of the image quality acquired by the optical sensor 12. In other embodiments, the unpatterned structure of the optical layer 1026 can also be modified by a planarization process to convert an uneven surface into a flat or nearly flat surface. The filling process may include forming a light-transmissive material layer on the rugged surface. The refractive index of the light-transmissive material layer may be equal to or similar to the refractive index of the light-transmissive body 1026B, but is not limited thereto. For example, the transparent material layer may be an adhesive layer, but not limited thereto.

In other embodiments, the light-transmitting body 1026B may have an opening (not shown) in the first region R1, and the opening is used as an unpatterned structure, but not limited thereto.

In other embodiments, the number of diffusion sheets or prism sheets included in the backlight module 102 is not limited to one. For example, the optical layers 1024 and 1026 can be both diffusion sheets or both prism sheets. When the backlight module 102 includes two prism sheets, the extending direction of the microstructures of one of the prism sheets may be parallel to the first direction D1, and the extending direction of the microstructures of the other prism sheet may be parallel to the second direction D2, but not limited thereto. In addition, the backlight module 102 may have additional or fewer optical layers as required. For example, the backlight module 102 may include a light guide plate, two diffusion sheets, and two prism sheets, but not limited thereto.

The backlight module 102 may further include other elements or layers according to different requirements. For example, the backlight module may also include a light blocking element 1029. The light shielding element 1029 is disposed in the second region R2 near the periphery of the first region R1, and also near the boundary I between the first region R1 and the second region R2. The blocking element 1029 is adapted to block (e.g., absorb) the light beam to reduce the formation of stray light or to reduce the probability of light beams of different angles reaching the human eye. For example, the light shielding element 1029 may include ink or adhesive tape, and the method of forming the light shielding element 1029 may include coating, printing, or attaching, but is not limited thereto.

In some embodiments, the light shielding element 1029 may be disposed between the reflective sheet 1020 and the optical layer 1022 and near the periphery of the first region R1, i.e. near the boundary I between the first region R1 and the second region R2, so as to reduce the reflectivity of the light beam at the boundary I between the first region R1 and the second region R2, and to improve the uniformity of the light beam at the boundary I between the first region R1 and the second region R2. In other embodiments, the light blocking element 1029 may also be disposed between other film layers. In addition, in other embodiments, the backlight module 102 may further include a Dual Brightness Enhancement Film (DBEF), but not limited thereto.

The switching diffuser 104 is disposed between the display panel 100 and the backlight module 102. In some embodiments, the switching diffuser 104 may be an electrically controlled switching diffuser. The electrically controlled switching diffuser may include two substrates (not shown), two conductive layers (not shown), and a display medium layer (not shown). The two substrates are arranged oppositely and can be light-transmitting substrates. The material of the transparent substrate may include glass or plastic, but not limited thereto. The two conducting layers are respectively arranged on the two substrates and positioned between the two substrates. The two conductive layers may include a light-transmitting conductive layer to improve light transmittance. For example, the two conductive layers may be formed of a light-transmissive conductive material or a metal mesh, but not limited thereto. A display medium layer is located between the two conductive layers. The display medium layer may include a Polymer Dispersed Liquid Crystal (PDLC), but is not limited thereto. In the presence of a voltage difference between the two conductive layers, the polymer dispersed liquid crystal assumes a transparent state. On the other hand, in the case where there is no voltage difference between the two conductive layers (input voltage is 0), the polymer dispersed liquid crystal exhibits a scattering state. In other words, the switchable diffuser 104 may be switched between the scattering state and the transparent state by changing the input voltage.

In the display mode, the switchable diffuser 104 is switchable to a scattering state. In the scattering state, the switchable diffuser 104 scatters the light beam from the backlight module 102 to achieve the atomization effect. The switching diffuser 104 having the atomizing effect is adapted to shield the optical sensor 12 disposed corresponding to the first region R1, thereby contributing to a reduction in visibility of the optical sensor 12. In addition, since at least one of the plurality of optical layers has different structures in the first region R1 and the second region R2, the light beam is not uniform at the boundary I between the first region R1 and the second region R2, the switching diffuser 104 with the atomizing effect can improve the non-uniformity, reduce the difference in visual effect between the first region R1 and the second region R2 or improve the uniformity of the overall light emission, so that the display device 10 provides good display quality in the display mode. In the image capture mode, the switchable diffuser 104 is switchable to a transparent state. In the transparent state, the switchable diffuser 104 facilitates the transmission of light beams outside the display device 10 to the optical sensor 12, such that the display device 10 can acquire clear images or videos in the image acquisition mode.

In some embodiments, the display device 10 may further include an upper polarizer 106 and a lower polarizer 108. The upper polarizer 106 and the lower polarizer 108 are disposed on two opposite surfaces of the display panel 100, respectively, and the lower polarizer 108 is disposed between the switching diffuser 104 and the display panel 100. The upper polarizer 106 and the lower polarizer 108 may have perpendicular transmission axes, or the upper polarizer 106 and the lower polarizer 108 may have parallel transmission axes. In some embodiments, the lower polarizer 108 may include a highly polarized Conversion Film (APCF), but is not limited thereto.

The optical sensor 12 is disposed corresponding to the first region R1. For example, the optical sensor 12 may overlap the first region R1 in the normal direction D3 of the mobile device 1. The optical sensor 12 is adapted to receive the light beam to acquire an image or video of the outside. For example, the optical sensor 12 may include a Charge Coupled Device (CCD), a Complementary Metal Oxide Semiconductor (CMOS), or a photodiode (photodiode), but is not limited thereto.

In some embodiments, the mobile device 1 may further include a light emitting unit 14. The light emitting unit 14 may be adjacent to the optical sensor 12. For example, the light emitting unit 14 may be disposed at the periphery of the optical sensor 12 and located in the first region R1, but not limited thereto. The number of the light emitting units 14 and the relative arrangement relationship (such as the spacing or arrangement) between the light emitting units and the optical sensor 12 can be changed according to the requirement, and is not limited to the illustration shown in the figure.

The light emitting unit 14 is adapted to boost the brightness of the first region R1. For example, the light emitting unit 14 may include an organic light emitting diode, a sub-millimeter light emitting diode, a micro light emitting diode or a quantum dot light emitting diode, a fluorescent, phosphorescent or other suitable material, or a combination thereof, but is not limited thereto.

In fig. 1, the optical sensor 12 disposed under the display device 10 is enabled to receive a light beam outside the display device 10 by a structural design (non-patterned structure and patterned structure) that partitions a film layer or element in the backlight module 102. Since the optical sensor 12 may be disposed without forming a groove in the front surface of the display device 10, the display device 10 and the mobile device 1 may realize a full screen display. In addition, the switchable diffuser 104 is used to shield the optical sensor 12 disposed corresponding to the first region R1 or improve the phenomenon that the light beam is not uniform at the boundary I between the first region R1 and the second region R2 due to different structures of at least one of the optical layers in the first region R1 and the second region R2, which is helpful to reduce the difference in visual effect between the first region R1 and the second region R2. In this way, the display device 10 and the mobile device 1 can achieve full-screen display and have good display quality.

Referring to fig. 2, a main difference between the mobile device 1A and the mobile device 1 of fig. 1 is a structural design of the backlight module 102A of the display device 10A. In the backlight module 102A, the first region R1 of the optical layer 1022' (e.g., a light guide plate) includes a patterned structure different from the second region R2. Specifically, a plurality of dots 1022P of the optical layer 1022' are positioned in the first region R1 in addition to the second region R2 to enhance the brightness of the first region R1. In some embodiments, the density of the plurality of dots 1022P in the first region R1 is less than the average density of the plurality of dots 1022P in the second region R2 (i.e., the total area of the second region R2 divided by the total number of dots 1022P located in the second region R2) to account for brightness and image quality acquired by the optical sensor 12.

Referring to fig. 3, the main difference between the mobile device 1B and the mobile device 1A of fig. 2 lies in the structural design of the backlight module 102B of the display device 10B. In backlight module 102B, optical layer 1024 '(e.g., a diffuser sheet) includes openings H' in first region R1. Specifically, the opening H ' is formed in the light-transmitting body 1024B ' of the optical layer 1024 ', and the opening H ' serves as an unpatterned structure of the optical layer 1024 '.

In addition, the light blocking element 1029 is further disposed between the optical layer 1022 ' and the optical layer 1024 ' and near the opening H ' of the first region R1 to further improve the uniformity of the light beam at the interface I of the first region R1 and the second region R2.

Referring to fig. 4, the main difference between the mobile device 1C and the mobile device 1A of fig. 2 is that the display device 10C further includes a switching diffuser 109. The switching diffuser 109 is disposed between the optical sensor 12 and the backlight module 102A, and the switching diffuser 109 is operable synchronously with the switching diffuser 104, i.e. the switching diffuser 109 is switchable to a scattering state together with the switching diffuser 104 or to a transparent state together with the switching diffuser 104. The switching diffuser 109 is described in detail with reference to the switching diffuser 104, and will not be described again.

By the arrangement of the switching diffuser 109, the optical sensor 12 disposed corresponding to the first region R1 can be further shielded or the phenomenon that the light beam is not uniform at the boundary I between the first region R1 and the second region R2 due to at least one of the optical layers having different structures in the first region R1 and the second region R2 can be improved, which is helpful for reducing the difference in visual effects between the first region R1 and the second region R2 or improving the uniformity of the display.

Referring to fig. 5, the main difference between the mobile device 1D and the mobile device 1B of fig. 3 is that the display device 10D further includes a switchable diffuser 109. The switching diffuser 109 is disposed between the optical sensor 12 and the backlight module 102B. Reference is made to the above description for operation of the switching diffuser 109 and other details, which will not be repeated here.

Referring to fig. 6, the main difference between the mobile device 1E and the mobile device 1B of fig. 3 lies in the structural design of the backlight module 102E of the display device 10E. In the backlight module 102E, the plurality of dots 1022P of the optical layer 1022 are located in the second region R2 but not in the first region R1.

In summary, in the embodiments of the disclosure, the optical sensor 12 can receive the light beam outside the display device 10 by the structure design of partitioning the film layer or the element in the backlight module. Since the optical sensor can be disposed without forming a groove in the front surface of the display device, the display device and the mobile device can realize a full screen display. In addition, the optical sensor disposed corresponding to the first region is shielded or the difference between the structures of at least one of the optical layers in the first region R1 and the second region R2 is improved by using the switching diffuser, so that the light beam is not uniform at the boundary I between the first region R1 and the second region R2, which is helpful for reducing the difference between the visual effects of the first region and the second region. Therefore, the display device and the mobile device can realize full-screen display and have good display quality.

In some embodiments, the backlight module may further include a light shielding element to reduce the formation of stray light or reduce the probability of light beams of different angles reaching human eyes. In some embodiments, the mobile device may further include a light emitting unit disposed at a periphery of the optical sensor to increase brightness of the first region. In some embodiments, the first region of the light guide plate may include a plurality of dots therein to enhance the brightness of the first region. In some embodiments, the density of the plurality of dots in the first region is less than the average density of the plurality of dots in the second region to account for brightness and image quality acquired by the optical sensor. In some embodiments, the diffuser may include openings in the first region to improve the quality of the image acquired by the optical sensor. In some embodiments, the display device may include a plurality of switching diffusers to further reduce the difference between the visual effects of the first region R1 and the second region R2 or to improve the uniformity of the display.

The above embodiments are only used for illustrating the technical solutions of the present disclosure, and not for limiting the same; while the present disclosure has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure.

Although the embodiments of the present disclosure and their advantages have been described above, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure, and the features of the various embodiments may be arbitrarily mixed and substituted with one another to form new embodiments. Moreover, the scope of the present disclosure is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification, but rather, the present disclosure will suggest themselves to those skilled in the art having the benefit of this disclosure, and is intended to cover such modifications as may incorporate those features or methods into the practice of the present disclosure, as well as the equivalents of such processes, machines, manufacture, composition of matter, means, methods and steps, or any materials, which perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein. Accordingly, the scope of the present disclosure includes the processes, machines, manufacture, compositions of matter, means, methods, and steps described above. In addition, each claim constitutes a separate embodiment, and the scope of the present disclosure also includes combinations of the respective claims and embodiments. The scope of the present disclosure is to be determined by the claims appended hereto.