CN115602047A

CN115602047A - Electronic device

Info

Publication number: CN115602047A
Application number: CN202210658958.4A
Authority: CN
Inventors: 许玮宗; 苏慧汶
Original assignee: Innolux Display Corp
Current assignee: Innolux Corp
Priority date: 2021-07-09
Filing date: 2022-06-10
Publication date: 2023-01-13
Also published as: TW202303239A

Abstract

The invention provides an electronic device, which is characterized by comprising: a panel; and a backlight module disposed opposite to the panel and including: a light guide plate; a first optical assembly disposed on the light guide plate and having a first prism structure; the second optical assembly is arranged on the first optical assembly and is provided with a second prism structure; the third optical assembly is arranged on the second optical assembly and is provided with a third prism structure; the first prism structure faces the light guide plate, and the second prism structure and the third prism structure face the panel.

Description

Electronic device

Technical Field

The present invention relates to a backlight module and an electronic device including the same, and more particularly, to an electronic device including a backlight module with a specially designed optical assembly.

Background

With the continuous development of science and technology, electronic devices are designed to be peep-proof, low-energy-consumption, high-quality or low-cost. Nowadays, electronic devices with more concentrated light sources are mostly obtained by attaching a peep-proof sheet to the electronic devices or by using a collimated backlight module (collimated backlight), so as to achieve privacy effect. However, the above method still has the disadvantages of high energy consumption, high cost or low yield.

Therefore, it is desirable to provide a new backlight module and/or an electronic device to improve the above-mentioned drawbacks.

Disclosure of Invention

The invention provides an electronic device, comprising: a panel; and a backlight module disposed opposite to the panel and including: a light guide plate; a first optical component, which is arranged on the light guide plate and is provided with a first prism structure; the second optical assembly is arranged on the first optical assembly and is provided with a second prism structure; the third optical assembly is arranged on the second optical assembly and is provided with a third prism structure; the first prism structure faces the light guide plate, and the second prism structure and the third prism structure face the panel.

The present invention also provides an electronic device, comprising: a panel; and a backlight module disposed opposite to the panel and including: a light guide plate; a first optical assembly disposed on the light guide plate; a second optical assembly disposed on the first optical assembly; the third optical assembly is arranged on the second optical assembly and is provided with a third prism structure and a surface opposite to the third prism structure; the third prism structure includes a plurality of acute angle portions and a plurality of round angle portions, one of the plurality of round angle portions is disposed between two adjacent acute angle portions, and in a normal direction of the panel, a height from one of the plurality of round angle portions to the surface of the third optical element is smaller than a height from one of the plurality of acute angle portions to the surface of the third optical element.

Drawings

Fig. 1 is a cross-sectional view of an electronic device according to an embodiment of the invention.

Fig. 2 is a schematic perspective view of an electronic device according to an embodiment of the invention.

Fig. 3A and 3B are partial schematic views of an electronic device according to an embodiment of the invention.

Fig. 4A to 4D are optical analysis results of the electronic device in different states of the backlight module according to an embodiment of the invention.

Fig. 5 is a cross-sectional view of an electronic device according to an embodiment of the invention.

Fig. 6 is a cross-sectional view of an electronic device according to an embodiment of the invention.

Fig. 7 is a cross-sectional view of an electronic device according to an embodiment of the invention.

Fig. 8 is a cross-sectional view of an electronic device according to an embodiment of the invention.

Fig. 9 is a cross-sectional view of an electronic device according to an embodiment of the invention.

Fig. 10A is a partial perspective view of an electronic device according to an embodiment of the invention.

Fig. 10B is a cross-sectional view taken along line I-I' of fig. 10A.

Fig. 11 is a perspective view of a third optical assembly according to an embodiment of the invention.

[ description of reference ]

100-panel

200-backlight module

10-light guide plate

11-first optical component

111-first prism structure

111 a-first strip structure

111 b-surface

12-second optical component

121-second prism structure

121 a-second stripe structure

121 b-surface

13-third optical component

131-third prism structure

131 a-third strip configuration

131 b-surface

14-diffusion assembly

14-1-diffusion assembly

16-grating assembly

17-reflective composite layer

20-light source

201-light emitting component

30-adhesive layer

40-reflective structure

401 light-absorbing layer

402-fourth optical component

402 b-surface

4021-fourth prism Structure

4021 a-fourth strip Structure

S1-sharp angle strip structure

S2-fillet strip structure

P1-sharp corner part

P2-round corner part

T1, T2-top

e1, e 2-topside

H1-height difference

Radius of curvature R-

PI spacing

Theta 1-first apex angle

Theta 2-second apex angle

Theta 3-third apex angle

Theta 4-fourth apex angle

Theta 5-fifth apex angle

In the X-direction

Y-first direction

Z-top view direction

F1-frame

F2-supporting frame

CB-circuit board

126-reflection assembly

Angle of inclination theta

Azimuth angle

ES-light incident surface

BS-opposite face

Detailed Description

The following description of the embodiments of the present invention is provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

It should be noted that, unless otherwise indicated herein, the inclusion of "a" or "an" element is not limited to inclusion of a single such element, but rather may include inclusion of one or more such elements. Furthermore, the use of ordinal numbers such as "first" and "second" in the specification and claims to modify a claim element does not by itself connote or represent any preceding ordinal number of the claim element, nor is the order in which a claimed element is ordinal for one or more claim elements or methods of manufacture, but are used merely to distinguish one claimed element having a certain name from another claimed element having a same name.

Certain terms are used throughout the description and following claims to refer to particular components. 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 "comprising," including, "" having, "and the like are open-ended terms, and thus should be interpreted to mean" including, but not limited to. Thus, when the terms "comprises," "comprising," and/or "having" are used in the description of the present invention, they specify the presence of stated features, regions, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, regions, steps, operations, and/or components.

As used herein, the term "about," "substantially," "approximately" refers to within 10%, within 5%, within 3%, within 2%, within 1%, or within 0.5% of a given value or range. Where a given quantity is an approximate quantity, that is, without specifically reciting "about", "substantially" or "approximately", the meanings of "about", "approximately", "essentially" or "approximately" may still be implied. Furthermore, the terms "range from a first value to a second value" and "in-between" mean that the range includes the first value, the second value and other values in-between.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Furthermore, relative terms, such as "below" or "bottom" and "above" or "top," may be used in embodiments to describe one element's relative relationship to another element of the drawings. It will be understood that if the device of the drawings is turned over and turned upside down, elements described as being on the "lower" side will be elements on the "upper" side. When a respective member (e.g., a film or region) is referred to as being "on" another member, it can be directly on the other member or there can be other members between the two. On the other hand, when a member is referred to as being "directly on" another member, there is no member between the two. In addition, when a member is referred to as being "on" another member, the two members may be located above or below the other member in a top-down relationship depending on the orientation of the device.

In the present invention, the thickness, length and width can be measured by an optical microscope, and the thickness can be measured by a cross-sectional image in an electron microscope, but not limited thereto. In addition, there may be some error in any two values or directions for comparison. If the first value is equal to the second value, it implies that there may be an error of about 10% between the first value and the second value; if the first direction is perpendicular to the second direction, the angle between the first direction and the second direction may be between 80 degrees and 100 degrees; if the first direction is parallel to the second direction, the angle between the first direction and the second direction may be between 0 degrees and 10 degrees.

It should be noted that the technical solutions provided in the following different embodiments can be used alternatively, combined or mixed with each other to form another embodiment without departing from the spirit of the present invention.

Fig. 1 is a cross-sectional view of an electronic device according to an embodiment of the invention. Fig. 2 is a schematic perspective view of an electronic device according to an embodiment of the invention. Fig. 3A and 3B are partial schematic views of an electronic device according to an embodiment of the invention. As shown in fig. 1, fig. 2, fig. 3A and fig. 3B, the electronic device of the present invention includes: a panel 100; and a backlight module 200 disposed opposite to the panel 100, and including: a light guide plate 10; a first optical assembly 11 disposed on the light guide plate 10 and having a first prism structure 111; a second optical assembly 12 disposed on the first optical assembly 11 and having a second prism structure 121; and a third optical element 13 disposed on the second optical element 12 and having a third prism structure 131; wherein the first prism structure 111 faces the light guide plate 10, and the second and

third prism structures

121 and 131 face the panel 100. In detail, as shown in fig. 2, 3A and 3B, the first prism structure 111 may have a plurality of first stripe structures 111a and a surface 111B opposite to the plurality of first stripe structures 111a, the second prism structure 121 may have a plurality of second stripe structures 121a and a surface 121B opposite to the plurality of second stripe structures 121a, the third prism structure 131 may have a plurality of third stripe structures 131a and a surface 131B opposite to the third stripe structures 131a, the first prism structure 111 facing the light guide plate 10 is the first stripe structure 111a closer to the light guide plate 10 than the surface 111B, the second prism structure 121 facing the panel 100 is the second stripe structure 121a closer to the panel 100 than the surface 121B, and the third prism structure 131 facing the panel 100 is the third stripe structure 131a closer to the panel 100 than the surface 131B.

It should be understood that, although only the panel 100 is shown in the drawings, the panel 100 may include upper and lower substrates, a display unit, a sealing member, an alignment film, a polarizer, a light shielding layer, a color filter layer, and/or a driving element, but the invention is not limited thereto.

In the present invention, as shown in fig. 1 and fig. 2, the backlight module 200 may further include a reflective structure 40, and the reflective structure 40 may be disposed under the light guide plate 10 and configured to reflect light emitted from the bottom of the light guide plate 10, so that the light travels toward the panel 100 to improve the utilization rate of the light. In some embodiments, the material of the reflective structure 40 is not particularly limited, and for example, includes metal, white ink, other reflective materials, or a combination thereof. The metal may include, but is not limited to, gold, silver, copper, aluminum, or a combination thereof. The white ink may include white polyimide, resin, or a combination thereof, but is not limited thereto. In addition, the reflective structure 40 may include a single or multilayer film reflective sheet.

As shown in fig. 1 and fig. 2, the backlight module 200 may further include a light source 20, the light source 20 may include a plurality of light emitting elements 201, and the plurality of light emitting elements 201 may be arranged along a first direction Y, for example. In some embodiments, the light source 20 may include a light emitting diode, which may include, for example, an Organic Light Emitting Diode (OLED), a sub-millimeter light emitting diode (mini LED), a micro LED, or a quantum dot light emitting diode (quantum dot LED, which may include QLED, QDLED), fluorescent (fluorescent), phosphorescent (phosphor), or other suitable material, or a combination thereof, but is not limited thereto. In some embodiments, the backlight module 200 may include a frame F1 and/or a supporting frame F2, and the frame F1 may be used to accommodate the light source 20, the light guide plate 10, or the optical film layer (such as the first optical element 11, the second optical element 12 and/or the third optical element 13) and the supporting frame F2, but is not limited thereto. The panel 100 may be disposed on the support frame F2, for example. In some embodiments, the material of the frame piece F1 and/or the support frame F2 may include metal, plastic, ceramic, other suitable materials, or a combination of the foregoing, but is not limited thereto. In some embodiments, the backlight module 200 may include a circuit board CB, and the circuit board CB may include a hard circuit board (e.g., a Printed Circuit Board (PCB)) or a flexible circuit board (e.g., a flexible printed circuit board (FPC)), and the circuit board CB may include an active driving element or a passive driving element thereon, and the circuit board CB may be used to control light emission of the light source 20, but is not limited thereto.

In some embodiments, the backlight module 200 further includes a reflective element 126, the reflective element 126 may be adjacent to the light source 20 and the light incident surface ES of the light guide plate 10, and the reflective element 126 may be disposed on the light source 20 and/or a portion of the light guide plate 10. In some embodiments, the reflective component 126 can comprise a high reflectivity material, such as a material having a reflectivity between 70% and 99% (70% ≦ reflectivity ≦ 99%), but is not so limited. In some embodiments, the material of the reflective component 126 may include, but is not limited to, metal, white ink, white tape, other suitable reflective materials, or combinations thereof. The reflective member 126 may be used to reflect the light generated by the light source 20 to the light guide plate 10, reduce light loss, reduce light leakage, or improve the brightness of the electronic device.

The details of the construction of the first optical assembly 11, the second optical assembly 12, and the third optical assembly 13 of the present invention will be described in detail below.

As shown in fig. 2, the light source 20 may include a plurality of light emitting elements 201, and the plurality of light emitting elements 201 may be arranged along a first direction Y, for example, the extending direction of the first prism structure 111 may be perpendicular to the first direction Y, the extending direction of the second prism structure 121 may be parallel to the first direction Y, and the extending direction of the third prism structure 131 may be perpendicular to the first direction Y, for example, but is not limited thereto. The term "perpendicular" means that the angle between the extending direction of the prism structure and the first direction Y is between 87 DEG and 93 deg (87 DEG and 93 DEG). The term "parallel" means that the angle between the extending direction of the prism structure and the first direction Y is between 0 DEG and 6 deg (the angle is 0 DEG to 6 deg).

In more detail, as shown in fig. 1 and 2, the first prism structure 111 may have a plurality of first stripe structures 111a, and the extending direction of the first prism structure 111 is the extending direction of the first stripe structures 111 a. Similarly, the second prism structure 121 may have a plurality of second stripe structures 121a, and the extending direction of the second prism structure 121 is the extending direction of the second stripe structures 121 a. Similarly, the third prism structure 131 may have a plurality of third stripe structures 131a, and the extending direction of the third prism structure 131 is the extending direction of the third stripe structures 131 a.

Fig. 3A and 3B are partial schematic views of an electronic device according to an embodiment of the invention. For convenience of description, fig. 3A and 3B omit parts of the electronic device, such as the light source 20, the light emitting element 201, the reflecting element 126, the circuit board CB, the frame F1 and/or the supporting frame F2. Fig. 3A and 3B may respectively correspond to cross-sectional views in different directions of fig. 2.

As shown in fig. 2, 3A and 3B, the extending direction of the first prism structure 111 may be, for example, perpendicular to the first direction Y, the extending direction of the second prism structure 121 may be, for example, parallel to the first direction Y, and the extending direction of the third prism structure 131 may be, for example, perpendicular to the first direction Y, but is not limited thereto. The first prism structure 111 (e.g., the first bar-shaped structure 111 a) may have a first vertex angle θ 1, the second prism structure 121 (e.g., the second bar-shaped structure 121 a) may have a second vertex angle θ 2, and the third prism structure 131 (e.g., the third bar-shaped structure 131 a) may have a third vertex angle θ 3. In some embodiments, the first and/or third apex angles θ 1 and θ 3 may be between 87 ° and 93 °, respectively (87 ° ≦ θ 1 ≦ 93 °, 87 ° ≦ θ 3 ≦ 93 °), or may be between 88 ° and 92 °, respectively (88 ° ≦ θ 1 ≦ 92 °, 88 ° ≦ θ 3 ≦ 92 °), but are not limited thereto. In some embodiments, the first apex angle θ 1 and the third apex angle θ 3 may be the same or different. In some embodiments, the second vertex angle θ 2 is between 50 ° and 60 ° (50 ° ≦ θ 2 ≦ 60 °) or between 52 ° and 58 ° (52 ° ≦ θ 2 ≦ 58 °), but is not limited thereto.

In some embodiments, the refractive index n1 of the first optical component 11, the refractive index n2 of the second optical component 12, and/or the refractive index n3 of the third optical component 13 may be between 1.45 and 1.60, respectively (1.45. Ltoreq. N1. Ltoreq.1.60 1.45. Ltoreq. N2. Ltoreq.1.60) or may be between 1.48 and 1.58, respectively (1.48. Ltoreq. N1. Ltoreq.1.58 1.48. Ltoreq. N2. Ltoreq.1.58) or 1.48. Ltoreq. N3. Ltoreq.1.58. In some embodiments, the refractive index n1, the refractive index n2, and/or the refractive index n3 may be the same or different. In some embodiments, the material of the first optical element 11, the second optical element 12 and/or the third optical element 13 may include a transparent material, but is not limited thereto. In some embodiments, the first optical element 11, the second optical element 12, and/or the third optical element 13 may include a substrate (not shown) and corresponding prism structures (e.g., the first prism structure 111, the second prism structure 121, and the third prism structure 131). The material of the substrate or the prism structure may include, but is not limited to, polycarbonate (PC), polyimide (PI), polyethylene terephthalate (PET), polymer polyol (POP), polymethyl methacrylate (PMMA), cyclic Olefin Polymer (COP), rubber, glass, other suitable materials, or a combination thereof. In some embodiments, the material of the prism structure may include a photo-curing adhesive, a thermal curing adhesive, a photo-thermal curing adhesive, a moisture curing adhesive, other suitable materials, or a combination thereof, but is not limited thereto. In some embodiments, the material of the prism structure may include Optically Clear Adhesive (OCA), optically Clear Resin (OCR), acrylic resin (acrylic resin), other suitable materials, or combinations of the foregoing, but is not limited thereto. In some embodiments, the first optical element 11, the second optical element 12, and the third optical element 13 may be made of the same or different materials.

The backlight module 200 of the present invention can make the light emitted from the backlight module 200 converge toward the front viewing angle by the placing positions among the first optical element 11, the second optical element 12 and the third optical element 13, such as the included angles between the first prism structure 111, the second prism structure 121 and the third prism structure 131 and the first direction Y (the arrangement direction of the light emitting elements 201), or the relation between the first prism structure 111, the second prism structure 121 and the third prism structure 131 facing toward or away from the light guide plate 10, respectively, and the following detailed description will be made through the optical analysis results in fig. 4A to 4D. In addition, the angle design of the first vertex angle θ 1 of the first prism structure 111, the second vertex angle θ 2 of the second prism structure 121, and/or the third vertex angle θ 3 of the third prism structure 131 can further achieve a better effect of concentrating the light toward the front viewing angle. When the backlight module 200 of the present invention is combined with the panel 100, an electronic device with more concentrated light rays towards a positive viewing angle can be obtained, and therefore, the privacy requirement can be achieved without additional attaching or arranging a peep-proof sheet, or without using a low-yield and/or high-cost collimating type backlight module.

In some embodiments, the surface 121b of the second optical component 12 can be a roughened surface, and the Haze (Haze) of the surface 121b can be between 3% and 15% (3% Haze 15%) or between 5% and 12% (5% Haze 12%), but is not limited thereto. The haze design of the surface 121b can reduce the risk of mutual absorption between the second optical element 12 and the first optical element 11, so as to improve the quality defect.

As shown in fig. 1 to fig. 3B, the backlight module 200 may further include a diffusion component 14, and the diffusion component 14 may be disposed on the third optical component 13. In some embodiments, the backlight module 200 may further include a diffusion component 14-1 disposed between the first optical component 11 and the light guide plate 10, but is not limited thereto. In some embodiments, the haze of the diffuser assembly 14 and/or the diffuser assembly 14-1 can be between 5% and 50%, respectively (5% haze. Ltoreq. 50%) or between 30% and 50%, respectively (30% haze. Ltoreq. 50%), but is not limited thereto. In some embodiments, the diffuser assembly 14 may be used to scatter the light emitted by the light source 20 to make the brightness of the backlight module 200 more uniform. In some embodiments, the haze of the surface 121b of the second optical element 12 can be prepared by, but not limited to, embossing, sandblasting, or other suitable processes.

Fig. 4A to 4D are optical analysis results of the electronic device in different states of the backlight module according to an embodiment of the invention. In detail, fig. 4A to 4D respectively show optical analysis results of an electronic device under different optical films of the backlight module 200, where the optical analysis results are measured under the electronic device including the panel 100 and the backlight module. The optical analysis results can be obtained by, for example, cone-beam (conocopic) lens measurement, but not limited thereto. For example, the optical analysis result graph can be measured or analyzed using, but not limited to, conoscope, BM5A, conometer U, or other suitable instruments.

It should be noted that the optical analysis results in fig. 4A to 4D may include azimuth angles

(e.g., azimuth angle of 0 to 360 degrees in the figure) and an inclination angle theta (e.g., inclination angle of 0 to 80 degrees in the figure). The inclination angle θ is, for example, an angle with the normal direction of the panel 100, and the inclination angle θ of 0 degree can represent a vertical direction of the upper surface of the panel 100. Azimuth angle

For example, an angle in a direction parallel to the upper surface of the panel 100, an azimuth angle

The 90 degree position can be approximately the position, the azimuth angle, of the light incident surface ES (as shown in fig. 2) of the light guide plate 10

The 270 degree position may be approximately the position corresponding to the opposite surface BS of the light incident surface ES (shown in fig. 2) of the light guide plate 10. In addition, the right-hand color levels of FIGS. 4A to 4D represent different luminance per unit area (cd/m) ² ) Range, luminance value per unit area (cd/m) ² ) The range is only for illustrating the result of one embodiment, but the invention is not limited thereto, and the brightness value per unit area may vary according to the design of the panel 100 or other factors.

As described above, fig. 4A to 4D are optical analysis results of electronic devices under different optical film layers of the backlight module 200, respectively. For example, when the backlight module only includes the light guide plate 10, the measured optical analysis result of the electronic device is shown in fig. 4A; when the backlight module further includes the first optical assembly 11 as described above in addition to the light guide plate 10, the measured optical analysis result of the electronic device is shown in fig. 4B; when the backlight module includes the first optical element 11 and the second optical element 12 as described above in addition to the light guide plate 10, the measured optical analysis result of the electronic device is shown in fig. 4C; when the backlight module further includes the first optical element 11, the second optical element 12, and the third optical element 13 in addition to the light guide plate 10, the measured optical analysis result of the electronic device is shown in fig. 4D.

In detail, as shown in fig. 4A, when the backlight module 200 only includes the light guide plate 10, it can be seen that the luminance value of the unit area of the light is 2.5e +04cd/m ² The above part may be located approximately at an azimuth angle

Is in the range of 240 degrees to 310 degrees and the inclination angle theta is in the range of about 60 degrees to 80 degrees, but is not limited thereto. In other words, after the light source 20 emits the light to the light guide plate 10, the light can be concentrated on the opposite surface BS of the light incident surface ES. After the first optical element 11, the second optical element 12 and the third optical element 13 are sequentially disposed on the light guide plate 10 of the backlight module 200, the optical analysis results thereof can be modulated sequentially as shown in fig. 4B to 4D. In detail, as shown in fig. 4B, after the light passes through the light guide plate 10 and the first optical element 11, the light can be substantially dispersed into two parts (e.g. a lower left part and a lower right part in fig. 4B) by the first optical element 11, wherein the luminance value per unit area in the lower left part is greater than 2.5e +04cd/m ² The above portions may generally correspond to azimuth angles

Approximately 230 degrees to 250 degrees, and the inclination angle theta is approximately at a position between the ranges of 60 degrees to 80 degrees, and the brightness value per unit area in the lower right part is greater than 2.5E +04cd/m ² May substantially correspond to an azimuth angle

And is approximately between 300 degrees and 320 degrees, and the tilt angle theta is approximately between 60 degrees and 80 degrees, but is not limited thereto. As shown in FIG. 4C, after the light passes through the light guide plate 10, the first optical element 11 and the second optical element 12, as shown in the figureThe split of the two portions (the lower left portion and the lower right portion) of 4B may vary, for example, toward a position of a front view angle (i.e., the closer the inclination angle θ is to 0 degrees), for example, the two portions as described above with respect to fig. 4B may substantially correspond to a position where the inclination angle θ is about 60 degrees to 80 degrees, while the position of the two portions as shown in fig. 4C varies to a position where the inclination angle θ is about 20 degrees to 40 degrees, but is not limited thereto. In other words, the light rays also pass through the second optical assembly 12, which concentrates the two portions of the split light towards a normal viewing angle. In addition, as shown in fig. 4D, after the light passes through the light guide plate 10, the first optical assembly 11, the second optical assembly 12 and the third optical assembly 13, the above-mentioned two portions of light split can be concentrated together, for example, so that the light is concentrated to the front view angle position of the electronic device. By the design of the relative relationship among the light guide plate 10, the first optical element 11, the second optical element 12 and the third optical element 13 of the backlight module 200 of the present invention, the electronic device can have the characteristic that light is concentrated toward the front viewing angle.

Fig. 5 is a cross-sectional view of an electronic device according to an embodiment of the invention. The electronic device of fig. 5 is similar to that of fig. 1, except for the following differences.

The backlight module 200 shown in fig. 5 may further include at least one adhesive layer 30, and the adhesive layer 30 may be disposed between the first optical assembly 11 and the second optical assembly 12, or between the second optical assembly 12 and the third optical assembly 13. In some embodiments, the adhesive layer 30 may be selectively disposed between the third optical element 13 and the diffusion element 14, but is not limited thereto. In some embodiments, the backlight module 200 may include at least one adhesive layer 30, and the adhesive layer 30 may be selectively disposed between the first optical element 11, the second optical element 12, the third optical element 13, and the first diffusion element 14, respectively. In some embodiments, the first optical element 11, the second optical element 12, the third optical element 13 and/or the diffusion element 14 may be bonded to each other by the adhesive layer 30 to form an optical film set, but is not limited thereto.

In some embodiments, the adhesive layer 30 includes a photo-curing adhesive material, a thermal curing adhesive material, a photo-curing adhesive material, a moisture-curing adhesive material, an adhesive tape, other suitable materials, or a combination thereof, but is not limited thereto. In some embodiments, the adhesive layer 30 may include polyvinyl butyral (PVB), ethylene Vinyl Acetate (EVA), thermoplastic Polyurethane (TPU), optical Clear Adhesive (OCA), optical Clear Resin (OCR), other suitable materials, or combinations thereof, but is not limited thereto. The adhesive layer 30 can reduce the relative position deviation between the components of each layer, or reduce the assembly process.

Fig. 6 is a cross-sectional view of an electronic device according to an embodiment of the invention. The electronic device of fig. 6 is similar to that of fig. 1, except for the following differences.

The backlight module 200 shown in fig. 6 may further include a grating element 16, and the grating element 16 may be disposed between the third optical element 13 and the panel 100. For example, the diffusing element 14 may be disposed between the grating element 16 and the third optical element 13. In other embodiments (not shown), an adhesive layer may optionally be disposed between the grating element 16 and the diffuser element 14 to adhere to each other. In some embodiments, the grating assembly 16 may include, but is not limited to, A Light Control Film (ALCF), a View Control Film (VCF), or other suitable light control layer. In some embodiments, the grating assembly 16 may be used to control the viewing angle of the electronic device.

Fig. 7 is a cross-sectional view of an electronic device according to an embodiment of the invention. The electronic device of fig. 7 is similar to that of fig. 6, except for the following differences.

The backlight module 200 shown in fig. 7 may further include a reflective composite layer 17, and the reflective composite layer 17 may be disposed between the third optical assembly 13 and the panel 100, for example. In some embodiments, the aforementioned diffusion element 14 and/or grating element 16 may be selectively disposed between the reflective composite layer 17 and the third optical element 13, and the grating element 16 may be disposed between the reflective composite layer 17 and the diffusion element 14, for example. In other embodiments (not shown), an adhesive layer may be optionally disposed between the reflective composite layer 17 and the grating element 16 or between the grating element 16 and the diffusion element 14 for adhering to each other, but is not limited thereto. In some embodiments, the reflective composite layer 17 may include a Dual Brightness Enhancement Film (DBEF), a reflective polarizer film (APF), but is not limited thereto. The reflective composite layer 17 can be used to improve the utilization rate of the light source and reduce the energy consumption of the electronic device.

Fig. 8 is a cross-sectional view of an electronic device according to an embodiment of the invention. The electronic device of fig. 8 is similar to that of fig. 1, except for the following differences.

The backlight module 200 shown in fig. 8 may further include a light absorbing layer 401 and a fourth optical member 402, the light absorbing layer 401 may be disposed below the light guide plate 10, for example, i.e., the light guide plate 10 may be disposed between the light absorbing layer 401 and the panel 100, for example. In some embodiments, the fourth optical assembly 402 may be disposed between the light guide plate 10 and the light absorbing layer 401, for example. In some embodiments, air may be present between the fourth optical assembly 402 and the light guide plate 10. In some embodiments, the light guide plate 10 may be disposed between the fourth optical assembly 402 and the panel 100. In some embodiments, the fourth optical element 402 may have a fourth prism structure 4021, and the fourth prism structure 4021 faces the light guide plate 10, for example, more specifically, the fourth prism structure 4021 may have a plurality of fourth linear structures 4021a and a surface 402b opposite to the plurality of fourth linear structures 4021a, and the so-called fourth prism structure 4021 faces the light guide plate 10, i.e., the fourth linear structure 4021a is closer to the light guide plate 10 than the surface 402 b. In some embodiments, the light emitting assemblies 201 are arranged along the first direction Y, and the extending direction of the fourth prism structures 4021 is, for example, perpendicular to the first direction Y, but is not limited thereto. The term "perpendicular" means that the angle between the extending direction of the prism structure and the first direction Y is between 87 DEG and 93 deg (87 DEG and 93 DEG). In more detail, the fourth prism structure 4021 may have a plurality of fourth bar-shaped structures 4021a, and the extending direction of the fourth prism structure 4021 is the extending direction of the fourth bar-shaped structures 4021a of the fourth prism structure 4021. In some embodiments, the fourth strip 4021a of the fourth prism structures 4021 may have a fourth apex angle θ 4, and the fourth apex angle θ 4 may be between 87 ° and 93 ° (87 ° ≦ θ 4 ≦ 93 °), or between 89 ° and 91 ° (89 ° ≦ θ 4 ≦ 91 °), but is not limited thereto. In some embodiments, the material or the manufacturing method of the fourth optical element 402 may be similar to that of the first optical element 11, the second optical element 12 and/or the third optical element 13, for example, and will not be described herein again.

As shown in the backlight module 200 of FIG. 8, in some embodiments, the light absorbing layer 401 has a reflectivity ranging from 0% to 25% (0% < reflectivity ≦ 25%), or from 0% to 10% (0% < reflectivity ≦ 10%), but is not limited thereto. In some embodiments, the absorbance of the light absorbing layer 401 may range between 75% and 100% (75% ≦ absorbance < 100%), or between 90% and 100% (90% ≦ absorbance < 100%), but is not so limited. In some embodiments, the material of the light absorbing layer 401 may comprise a high light absorbing material, a low reflective material, or a combination thereof, but is not limited thereto. In some embodiments, the material of the light absorbing layer 401 may include particles, paint, glue, other suitable materials, or combinations thereof, but is not limited thereto. In some embodiments, the light absorbing layer 401 may comprise black organic material, black inorganic material, polyethylene terephthalate, black ink, black tape, other suitable materials, or combinations thereof, but is not limited thereto. In some embodiments, the light absorbing layer 401 can be formed by a chemical vapor deposition process, a coating process, an evaporation process, an electroplating process, a sputtering process, a pasting process, a printing process, a baking finish process, or other suitable processes, but is not limited thereto. In some embodiments, the light absorbing layer 401 can be used to reduce the chance that stray light emitted from the bottom surface of the light guide plate 10 (i.e. the surface near the light absorbing layer 401) will be reflected back to the light guide plate 10, thereby reducing the brightness of large viewing angles, or improving the contrast of the positive viewing angles or increasing the brightness of the positive viewing angles. For example, the normal direction Z of the panel 100 may be, for example, 0 degree, and the positive viewing angle may be, for example, within about plus or minus 30 degrees (or 40 degrees) from the normal direction Z of the panel 100, but is not limited thereto.

Fig. 9 is a cross-sectional view of an electronic device according to an embodiment of the invention. The electronic device of fig. 9 is similar to that of fig. 1, except for the following differences.

As shown in fig. 9, the backlight module 200 may include a reflective structure 40 and a fourth optical element 402, the reflective structure 40 may be disposed under the light guide plate 10, i.e., the fourth optical element 402 may be disposed between the reflective structure 40 and the light guide plate 10. The reflective structure 40 may comprise a single layer structure or a multiple layer structure. The material of the reflective structure 40 can be as described above with reference to the reflective structure 40 of fig. 1, and is not described herein again. In some embodiments, the reflective structure 40 may comprise a reflective polarizer film (APF), but is not limited thereto. In some embodiments, the fourth optical component 402 between the reflective structure 40 and the light guide plate 10 may have a fourth prism structure 4021, and the fourth prism structure 4021 faces the light guide plate 10, for example, more specifically, the fourth prism structure 4021 may have a plurality of fourth bar structures 4021a and a surface 402b opposite to the plurality of fourth bar structures 4021a, and the so-called fourth prism structure 4021 faces the light guide plate 10, so that the fourth bar structure 4021a is closer to the light guide plate 10 than the surface 402 b. The fourth strip structure 4021a of the fourth prism structure 4021 may have a fourth vertex angle θ 4, and the structure or material of the fourth vertex angle θ 4 may be as described above in fig. 8, and will not be described again.

Fig. 10A is a partial perspective view of an electronic device according to an embodiment of the invention. Fig. 10B is a cross-sectional view taken along line I-I' of fig. 10A. The electronic device of the present embodiment is similar to that of fig. 1, except for the following differences.

In the present embodiment, as shown in fig. 10A, the third optical element 13 has a third prism structure 131, the third prism structure 131 faces the panel 100 (as shown in fig. 1), and the third prism structure 131 may have a plurality of third bar-shaped structures 131a and a surface 131b opposite to the third bar-shaped structures 131a, wherein an extending direction of the third prism structure 131 may be perpendicular to the first direction Y, for example.

In more detail, as shown in fig. 10A, the third strip-shaped structures 131a may include a plurality of pointed strip-shaped structures S1 and a plurality of rounded strip-shaped structures S2, wherein the pointed strip-shaped structures S1 and the rounded strip-shaped structures S2 are arranged along the first direction Y, and one of the plurality of strip-shaped structures S2 is disposed between two adjacent pointed strip-shaped structures S1. In some embodiments, one to eight sharp corner strip structures S1 may be disposed between two adjacent rounded corner strip structures S2. For example, in fig. 10A, 2 sharp corner strip structures S1 are disposed between two adjacent rounded corner strip structures S2, but not limited thereto. In other words, in a cross-sectional view, as shown in fig. 10B, the third prism structure 131a may include a plurality of pointed portions P1 and a plurality of rounded portions P2, the pointed portions P1 and the rounded portions P2 are arranged along the first direction Y, and one of the rounded portions P2 is disposed between two adjacent pointed portions P1, wherein the pointed strip-shaped structure S1 may correspond to the pointed portions P1, and the rounded strip-shaped structure S2 may correspond to the rounded portions P2. In some embodiments, one to eight acute corner portions P1 may be disposed between two adjacent rounded corner portions P2. For example, in fig. 10B, 2 sharp corner portions P1 may be disposed between two adjacent rounded corner portions P2, but is not limited thereto.

In addition, as shown in fig. 10A and 10B, in the normal direction Z of the panel 100, the height of the rounded stripe structure S2 (i.e., the height from the top T2 of the rounded portion P2 to the surface 131B of the third optical element 13) is less than the height of the pointed stripe structure S1 (i.e., the height from the top T1 of the pointed portion P1 to the surface 131B of the third optical element 13). In some embodiments, the height of the rounded stripe structure S2 (i.e., the height from the top T2 of the rounded portion P2 to the surface 131b of the third optical element 13) and the height of the pointed stripe structure S1 (i.e., the height from the top T1 of the pointed portion P1 to the surface 131b of the third optical element 13) have a height difference H1 therebetween, wherein the height difference H1 is greater than 0 micrometer (μm) and less than or equal to 2 micrometers (μm) (i.e., 0 μm < the height difference H1 ≦ 2 μm), but is not limited thereto.

In some embodiments, as shown in FIG. 10B, the sharp corner portions P1 may each have a fifth vertex angle θ 5, wherein the fifth vertex angle θ 5 may be between 87 ° and 93 ° (87 ° ≦ fifth vertex angle θ 5 ≦ 93 °) or between 88 ° and 92 ° (88 ° ≦ fifth vertex angle θ 5 ≦ 92 °), but is not limited thereto. The rounded portions P2 may each have a radius of curvature R, wherein the radius of curvature R may be greater than or equal to 3 micrometers (μm) and less than or equal to 5 micrometers (μm) (i.e., 3 μm. Ltoreq. Radius of curvature R. Ltoreq.5 μm). In addition, in some embodiments, the distance PI between two adjacent third bar-shaped structures 131a may be between 18 microns and 50 microns (18 μm ≦ distance PI ≦ 50 μm), wherein the "distance between two adjacent third bar-shaped structures" is a distance between the top T1 of the fingertip angle portion P1 and the top T1 of the tip angle portion P1 adjacent thereto in the first direction Y, or a distance between the top T1 of the fingertip angle portion P1 and the top T2 of the fillet portion P2 adjacent thereto in the first direction Y.

In some embodiments, the surface 131b of the third optical element 13 can be a rough surface, and the Haze (Haze) of the surface can be between 1% and 10% (1% Haze 10%), but is not limited thereto. In some embodiments, the haze of the surface 131b of the third optical element 13 can be prepared by a texturing process, a sandblasting process, or other suitable processes, but is not limited thereto. In addition, in some embodiments, the surface 131b of the third optical element 13 may be a smooth surface, and the smooth surface may be formed by a hard coating (hard coating) or a PET surface.

In the embodiment, as shown in fig. 1, the backlight module 200 may further include a diffusing component 14 disposed on the third optical component 13, wherein the haze of the diffusing component 14 may be between 1% and 30% (1% haze 30%). In some embodiments, although not shown, the backlight module 200 may not include the diffusion element 14 shown in FIG. 1. In addition, in other embodiments, the backlight module 200 may not include the diffusion component 14 shown in fig. 1, but include a diffusion component 14-1 shown in fig. 3A and 3B, the diffusion component 14-1 is disposed between the first optical component 11 and the light guide plate 10, wherein the haze of the diffusion component 14-1 may be between 80% and 100% (80% haze 100%). In some embodiments, the diffusion element 14 may be used to scatter the light emitted from the light source 20 to make the brightness of the backlight module 200 more uniform; the diffuser assembly 14-1 may be used to concentrate light at a positive viewing angle position of the electronic device, but is not limited thereto.

Fig. 11 is a perspective view of a third optical assembly according to an embodiment of the invention. Therein, the third optical assembly of fig. 11 is similar to that of fig. 10A, except for the following differences.

As shown in fig. 10A, the third bar-shaped structure 131a of the third prism structure 131 may be a regular structure, and in more detail, the third bar-shaped structure 131a may have a top edge e1, and the top edge e1 may be a straight line and may be perpendicular to the first direction Y. In other words, the top edge e1 may be parallel to the extending direction of the third prism structure 131 a.

In this embodiment, as shown in fig. 11, the third bar-shaped structure 131a of the third prism structure 131 can be an irregular structure, and in more detail, the third bar-shaped structure 131a can have a top edge e2, and the top edge e2 can be not a straight line, and can include an arc line or other irregular lines, for example. In other words, the top edge e2 may form an angle with the extending direction of the third prism structure 131 a.

Here, the top edge e1 of the third bar-shaped structure 131a in fig. 10A refers to a continuation line of the top end T1 of the pointed portion P1 or the top end T2 of the rounded portion P2 in the direction X perpendicular to the first direction Y in fig. 10B. Similarly, the top e2 of the third bar-shaped structure 131a in fig. 11 refers to a continuation line of the top T1 of the pointed corner portion P1 or the top T2 of the rounded corner portion P2 in the direction X perpendicular to the first direction Y in fig. 10B.

The backlight module 200 of the present invention can be applied to various electronic devices requiring a display panel, and the display panel can be, for example, a flexible display panel (flexible display panel), a touch display panel (touch display panel), a curved display panel (curved display panel), or a tiled display panel (tiled display panel), but is not limited thereto. The electronic device of the present invention may be, for example, a display, a mobile phone, a notebook computer, a video camera, a music player, a mobile navigation device, a television, etc. the electronic device of the present invention is not limited thereto.

The particular embodiments described above are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.

Claims

1. An electronic device, comprising:

a panel; and

a backlight module disposed opposite to the panel and comprising:

a light guide plate;

a first optical component, which is arranged on the light guide plate and is provided with a first prism structure;

the second optical assembly is arranged on the first optical assembly and is provided with a second prism structure; and

a third optical component arranged on the second optical component and provided with a third prism structure;

the first prism structure faces the light guide plate, and the second prism structure and the third prism structure face the panel.

2. The electronic device of claim 1, wherein the backlight module further comprises a light source, the light source comprises a plurality of light-emitting elements, and the light-emitting elements are arranged along a first direction, wherein the second prism structure extends parallel to the first direction, and the first prism structure and the third prism structure extend perpendicular to the first direction.

3. The electronic device of claim 1, wherein the first prism structure has a first vertex angle, the second prism structure has a second vertex angle, and the third prism structure has a third vertex angle, wherein the first vertex angle and the third vertex angle are respectively between 87 ° and 93 °, and the second vertex angle is between 50 ° and 60 °.

4. The electronic device of claim 1, wherein a surface of the second optical element adjacent to the light guide plate is a rough surface having a haze of 3% to 15%.

5. The electronic device of claim 1, wherein the backlight module further comprises a diffuser disposed on the third optical element, wherein the diffuser has a haze of between 5% and 50%.

6. The electronic device of claim 5, wherein the backlight module further comprises another diffuser disposed between the first optical element and the light guide plate, wherein the haze of the another diffuser is between 5% and 50%.

7. The electronic device of claim 1, wherein the backlight module further comprises an adhesive layer, wherein the adhesive layer is disposed between the first optical element and the second optical element or between the second optical element and the third optical element.

8. The electronic device of claim 1, wherein the backlight module further comprises a grating element disposed between the third optical element and the panel.

9. The electronic device of claim 1, wherein the backlight module further comprises a reflective composite layer disposed between the third optical element and the panel.

10. The electronic device of claim 1, wherein the backlight module further comprises:

a light absorbing layer, wherein the light guide plate is disposed between the light absorbing layer and the panel; and

a fourth optical component disposed between the light guide plate and the light absorbing layer,

the fourth optical assembly has a fourth prism structure facing the light guide plate.

11. An electronic device, comprising:

a panel; and

a backlight module disposed opposite to the panel and comprising:

a light guide plate;

a first optical assembly disposed on the light guide plate;

a second optical assembly disposed on the first optical assembly; and

a third optical component arranged on the second optical component and provided with a third prism structure and a surface opposite to the third prism structure;

the third prism structure includes a plurality of acute angle portions and a plurality of round angle portions, one of the plurality of round angle portions is disposed between two adjacent acute angle portions, and in a normal direction of the panel, a height from one of the plurality of round angle portions to the surface of the third optical element is smaller than a height from one of the plurality of acute angle portions to the surface of the third optical element.

12. The electronic device of claim 11, wherein a height difference exists between a height of one of the rounded portions to the surface of the third optical element and a height of one of the pointed portions to the surface of the third optical element, wherein the height difference is greater than 0 micron and less than or equal to 2 microns.

13. The electronic device according to claim 11, wherein the rounded portions each have a radius of curvature, wherein the radius of curvature is greater than or equal to 3 microns and less than or equal to 5 microns.

14. The electronic device of claim 11, wherein one to eight of the corner portions are disposed between two adjacent corner portions.

15. The electronic device of claim 11, wherein the surface of the third optical element is a rough surface having a haze of between 1% and 10%.

16. The electronic device of claim 11, wherein the backlight module further comprises a diffuser disposed on the third optical element, wherein the diffuser has a haze of between 1% and 30%.

17. The electronic device of claim 11, wherein the backlight module further comprises another diffuser disposed between the first optical element and the light guide plate, wherein the haze of the another diffuser is between 80% and 100%.