TW202303239A - Backlight module and electronic device comprising the same - Google Patents

Abstract

A backlight module and an electronic device comprising the same are provided. The electronic device includes: a panel; and a backlight module opposite to the panel and comprising: a light guide plate; a first optical element disposed on the light guide plate and having a first prism structure; a second optical element disposed on the first optical element and having a second prism structure; and a third optical element disposed on the second optical element and having a third prism structure, wherein the first prism structure faces the light guide plate, the second prism structure and the third prism structure face the panel.

Description

Backlight module and electronic device including it

The present disclosure relates to a backlight module and an electronic device including the same, especially to a backlight module including specially designed optical elements and an electronic device including the same.

With the continuous development of technology, electronic devices are designed to be privacy-proof, low-power consumption, high-quality or low-cost. Nowadays, electronic devices with more concentrated light sources are mostly obtained by attaching anti-spy sheets on the electronic devices, or using collimated backlight modules, so as to achieve privacy. However, the above methods still have disadvantages such as high energy consumption, high cost or low yield.

Therefore, it is currently necessary to provide a new backlight module and/or electronic device to improve the above defects.

The present disclosure provides an electronic device, comprising: a panel; and a backlight module, disposed relative to the panel, and comprising: a light guide plate; a first optical element, disposed on the light guide plate, and having a first edge A mirror structure; a second optical element, disposed on the first optical element, and has a second 騜鏡 structure; and a third optical element, disposed on the second optical element, and has a third 稜鏡 structure structure; wherein, the first pleated structure faces the light guide plate, and the second fret structure and the third fret structure face the panel.

The present disclosure further provides an electronic device, comprising: a panel; and a backlight module disposed relative to the panel, and comprising: a light guide plate; a first optical element disposed on the light guide plate; a second optical element , disposed on the first optical element; and a third optical element, disposed on the second optical element, and has a third 稜鏡 structure and a surface opposite to the third 稜鏡 structure; wherein, the The third corner structure includes a plurality of sharp corners and a plurality of rounded corners, one of the plurality of rounded corners is arranged between two adjacent plural sharp corners, and in the normal direction of the panel, the circles A height of one of the corner portions to the surface of the third optical element is smaller than a height of one of the sharp corner portions to the surface of the third optical element.

The implementation of the present disclosure is described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the content disclosed in this specification. This disclosure can also be implemented or applied by other different specific embodiments, and various modifications and changes can be made to the details in this specification for different viewpoints and applications without departing from the spirit of this creation.

It should be noted that, unless otherwise specified herein, having “a” element is not limited to having a single element, but may have one or more elements. Furthermore, the ordinal numbers used in the description and the claims, such as "first" and "second", are used to modify the elements of the claims, which do not imply or represent any previous ordinal numbers of the claimed elements. Nor does it represent the order of a requested element with another claimed element, or the order of the manufacturing method, and the use of these ordinal numbers is only used to enable a claimed element with a certain designation to be able to be used with another claimed element with the same designation. Make a clear distinction.

Certain terms may be used throughout the specification and appended claims of this disclosure to refer to particular elements. Those skilled in the art should understand that electronic device manufacturers may refer to the same element by different names. This document does not intend to distinguish between those elements that have the same function but have different names. In the following specification and claims, words such as "comprising", "containing", and "having" are open-ended words, so they should be interpreted as meaning "including but not limited to...". Therefore, when the terms "comprising", "containing" and/or "having" are used in the description of the present disclosure, it specifies the existence of corresponding features, regions, steps, operations and/or components, but does not exclude one or more The existence of a corresponding feature, region, step, operation and/or component.

In the text, the terms "about", "approximately", "substantially" and "approximately" usually mean within 10%, within 5%, within 3%, within 2% of a given value or range, Within 1% or within 0.5%. The quantities given here are approximate quantities, that is, in the absence of specific descriptions of "about", "approximately", "substantially", "approximately", "approximately", "approximately", "approximately" may still be implied The meaning of "essentially" and "approximately". In addition, the terms "the range is from the first value to the second value" and "the range is between the first value to the second value" mean that the range includes the first value, the second value and other values therebetween.

Unless otherwise defined, 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 disclosure belongs. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the background or context of the related art and the present disclosure, and not in an idealized or overly formal manner Interpretation, unless specifically defined herein.

In addition, relative terms such as "below" or "bottom" and "upper" or "top" may be used in the embodiments to describe the relative relationship of one element to another element in the drawings. It will be appreciated that if the illustrated device is turned over so that it is upside down, elements described as being on the "lower" side will then become elements on the "upper" side. When a corresponding element (eg, a film or region) is referred to as being "on" another element, it can be directly on the other element or there may be other elements interposed therebetween. On the other hand, when a component is referred to as being "directly on" another component, then there is no component in between. In addition, when a component is referred to as "on another component", the two have a vertical relationship in the plan view direction, and the component can be above or below the other component, and this vertical relationship depends on the orientation of the device ( orientation).

In this disclosure, the thickness, length and width can be measured by optical microscope, and the thickness can be measured by cross-sectional image in electron microscope, but not limited thereto. In addition, any two values or directions used for comparison may have certain errors. 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 difference between the first direction and the second direction The angle between them may be between 80° and 100°; if the first direction is parallel to the second direction, the angle between the first direction and the second direction may be between 0° and 10°.

It should be noted that the technical solutions provided in different embodiments below can be replaced, combined or mixed with each other to form another embodiment without violating the spirit of the present disclosure.

FIG. 1 is a cross-sectional view of an electronic device according to an embodiment of the present disclosure. FIG. 2 is a three-dimensional schematic diagram of an electronic device according to an embodiment of the present disclosure. 3A and 3B are partial schematic diagrams of an electronic device according to an embodiment of the present disclosure. As shown in Figure 1, Figure 2, Figure 3A and Figure 3B, the electronic device of the present disclosure is characterized in that it includes: a panel 100; and a backlight module 200, which is arranged relative to the panel 100, and includes: a light guide plate 10. A first optical element 11, disposed on the light guide plate 10, and has a first 稜鏡 structure 111; a second optical element 12, disposed on the first optical element 11, and has a second 稜鏡 structure 121; and a third optical element 13, disposed on the second optical element 12, and has a third 稜鏡 structure 131; wherein, the first 稜鏡 structure 111 faces the light guide plate 10, the second 稜鏡 structure 121 and the first 稜鏡 structure 131 The triangular structure 131 faces the panel 100 . In detail, as shown in FIG. 2, FIG. 3A and FIG. 3B, the first 稜鏡 structure 111 can have a plurality of first strip structures 111a and a surface 111b. 121 can have a plurality of second strip structures 121a and a surface 121b relative to the plurality of second strip structures 121a, and the third 稜鏡 structure 131 can have a plurality of third strip structures 131a and a surface 131b relative to the third strip structures 131a, and the so-called first 稜鏡 structure 111 facing the light guide plate 10 is the first strip-shaped structure 111a closer to the light guide plate 10 than the surface 111b, and the so-called second 稜鏡 structure 121 is the second strip-shaped structure facing the panel 100 121a is closer to the panel 100 than the surface 121b, and the so-called third rib structure 131 facing the panel 100 is that the third strip structure 131a is 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, display units, seals, alignment films, polarizers, light shielding layers, color filter layers and/or driving elements, etc., but The present disclosure is not limited thereto.

In this disclosure, as shown in FIG. 1 and FIG. 2 , the backlight module 200 may further include a reflective structure 40 . The reflective structure 40 may be disposed under the light guide plate 10 and used to reflect light emitted from the bottom of the light guide plate 10 . The light is made to travel toward the panel 100 to improve light utilization efficiency. In some embodiments, the material of the reflective structure 40 is not particularly limited, for example, it includes metal, white ink, other reflective materials or combinations thereof. Wherein, the metal may include gold, silver, copper, aluminum or a combination thereof, but is not limited thereto. 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-layer or multi-layer 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, and the light emitting diode may, for example, include an organic light emitting diode (organic light emitting diode, OLED), a submillimeter light emitting diode (mini LED), a micro light emitting diode. Micro LED or quantum dot LED (may include QLED, QDLED), fluorescence, phosphor or other suitable materials, or combinations thereof, but 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 above-mentioned light source 20, the light guide plate 10, or the above-mentioned optical film layer (such as the first optical element 11, The second optical element 12 and/or the third optical element 13) and the support frame F2, but not limited thereto. The panel 100 can be disposed on the supporting frame F2, for example. In some embodiments, the material of the frame F1 and/or the support frame F2 may include metal, plastic, ceramics, other suitable materials or combinations thereof, 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 rigid circuit board (such as a printed circuit board (PCB)) or a flexible circuit board (such as a flexible printed circuit board (flexible printed circuit board) circuit, FPC)), the circuit board CB may contain active driving components or passive driving components, and the circuit board CB may be used to control the output 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 can be adjacent to the light source 20 and the light incident surface ES of the light guide plate 10, and the reflective element 126 can be disposed on the light source 20 and/or part of the light guide plate 10 superior. In some embodiments, the reflective element 126 may include a material with a high reflectivity, such as a material with a reflectivity between 70% and 99% (70%≦reflectivity≦99%), but is not limited thereto. In some embodiments, the material of the reflective element 126 may include metal, white ink, white tape, other suitable reflective materials or combinations thereof, but is not limited thereto. The reflective element 126 can be used to reflect the light generated by the light source 20 to the light guide plate 10 to reduce light loss and light leakage, or increase the brightness of the electronic device.

The detailed structures of the first optical element 11 , the second optical element 12 , and the third optical element 13 of the present disclosure will be introduced 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, for example, along a first direction Y, and the extending direction of the first meridian structure 111 may be, for example, perpendicular to the first direction Y, The extending direction of the second cornel structure 121 may be, for example, parallel to the first direction Y, and the extending direction of the third cornel structure 131 may be, for example, perpendicular to the first direction Y, but not limited thereto. The “perpendicular” means that the angle between the extending direction of the above-mentioned fennel structure and the first direction Y is between 87° and 93° (87°≦angle≦93°). The “parallel” means that the angle between the extension direction of the above-mentioned fennel structure and the first direction Y is between 0° and 6° (0°≦angle≦6°).

In more detail, as shown in FIG. 1 and FIG. 2, the first 稜鏡 structure 111 can have a plurality of first strip structures 111a, and the extension direction of the so-called first 稜鏡 structures 111 is the first strip structure 111a direction of extension. Likewise, the second eel structure 121 may have a plurality of second strip structures 121a, and the extension direction of the so-called second eel structure 121 is the extension direction of the second elongation structures 121a. Similarly, the third eel structure 131 may have a plurality of third strip structures 131a, and the extension direction of the so-called third eel structure 131 is the extension direction of the third strip structures 131a.

3A and 3B are partial schematic diagrams of an electronic device according to an embodiment of the present disclosure. For convenience of illustration, FIG. 3A and FIG. 3B omit some structures of the electronic device, such as the light source 20, the light emitting element 201, the reflective element 126, the circuit board CB, the frame F1 and/or the support frame F2, etc. 3A and 3B may respectively correspond to cross-sectional views in different directions of FIG. 2 .

As shown in FIG. 2, FIG. 3A and FIG. 3B, the extending direction of the first 稜鏡 structure 111 can be, for example, perpendicular to the first direction Y, and the extending direction of the second 稜鏡 structure 121 can be, for example, parallel to the first direction Y, and the second The extending direction of the three-fold structure 131 may be, for example, perpendicular to the first direction Y, but is not limited thereto. The first 稜鏡 structure 111 (such as the first strip structure 111a) can have a first vertex angle θ1, the second 稜珡 structure 121 (such as the second strip structure 121a) can have a second vertex angle θ2, and the third The elongated structure 131 (for example, the third strip structure 131a) may have a third vertex angle θ3. In some embodiments, the first vertex angle θ1 and/or the third vertex angle θ3 can be between 87° and 93° respectively (87°≦θ1≦93°; 87°≦θ3≦93°) or can be respectively Between 88° and 92° (88°≦θ1≦92°; 88°≦θ3≦92°), but not limited thereto. In some embodiments, the first vertex angle θ1 and the third vertex angle θ3 may be the same or different. In some embodiments, the second vertex angle θ2 is between 50° and 60° (50°≦θ2≦60°) or between 52° and 58° (52°≦θ2≦58°), but Not limited to this.

In some embodiments, the refractive index n1 of the first optical element 11, the refractive index n2 of the second optical element 12 and/or the refractive index n3 of the third optical element 13 may be between 1.45 and 1.60 (1.45≦n1 ? 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 a corresponding 稜鏡 structure (such as the first 稜鏡 structure 111, the second The second 稜鏡 structure 121 and the third 稜鏡 structure 131). The material of the above-mentioned substrate or 稜鏡 structure may include polycarbonate (polycarbonate, PC), polyimide (polyimide, PI), polyethylene terephthalate (polyethylene terephthalate, PET), polymer polyol ( Polyether polyol, POP), polymethylmethacrylate (polymethylmethacrylate, PMMA), cycloolefin polymer (cycloolefin polymer, COP), rubber, glass, other suitable materials or combinations thereof, but not limited thereto. In some embodiments, the material of the above-mentioned 稜鏡 structure may include light-curable glue, heat-curable glue, light-heat-curable glue, moisture-curable glue, other suitable materials or combinations thereof, but is not limited thereto. In some embodiments, the material of the structure may include optical clear adhesive (OCA), optical clear resin (OCR), acrylic resin, other suitable materials, or a combination of the foregoing. , but not limited to this. In some embodiments, the same or different materials can be used to prepare the first optical element 11 , the second optical element 12 and the third optical element 13 .

The backlight module 200 of the present disclosure can use the positions among the first optical element 11 , the second optical element 12 and the third optical element 13 , for example, the first glazing structure 111 and the second glazing structure 121 and the angle relationship between the third 稜鏡 structure 131 and the first direction Y (arrangement direction of the light-emitting elements 201), or the first 稜鏡 structure 111, the second 稜鏡 structure 121 and the third 稜鏡 structure 131 respectively facing or away from The relationship of the light guide plate 10 can make the light emitted from the backlight module 200 concentrate towards the front viewing angle, which will be described in detail through the optical analysis results in FIG. 4A to FIG. 4D . In addition, the angle design of the first vertex angle θ1 of the first pleated structure 111, the second vertex angle θ2 of the second pleated structure 121 and/or the third vertex angle θ3 of the third pleated structure 131 can be further used to achieve better The best effect of focusing light toward the front viewing angle. When the backlight module 200 of the present disclosure is combined with the panel 100, an electronic device in which the light is more concentrated toward the front viewing angle can be obtained, so it can be used without additional attachment or setting of a privacy sheet, or without low yield and/or In the case of high-cost collimated backlight modules, privacy requirements can be met.

In some embodiments, the surface 121b of the second optical element 12 can be a rough surface, and the haze (Haze) of the surface 121b can be between 3% and 15% (3%≦haze≦15%) or between Between 5% and 12% (5%≦Haze≦12%), but not limited thereto. The haze design of the surface 121b can reduce the risk of mutual adsorption between the second optical element 12 and the first optical element 11, so as to improve taste defects.

As shown in FIGS. 1 to 3B , the backlight module 200 may further include a diffusion element 14 , and the diffusion element 14 may be disposed on the third optical element 13 . In some embodiments, the backlight module 200 may further include a diffusion element 14 - 1 disposed between the first optical element 11 and the light guide plate 10 , but is not limited thereto. In some embodiments, the haze of the diffusing element 14 and/or the diffusing element 14-1 may be between 5% and 50% (5%≦haze≦50%) or between 30% and 50%. Between (30%≦haze≦50%), but not limited to this. In some embodiments, the diffusion element 14 can be used to diffuse 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 embossing, sandblasting or other suitable processes, but is not limited thereto.

FIG. 4A to FIG. 4D are optical analysis results of an electronic device under different backlight module configurations according to an embodiment of the present disclosure. In detail, FIG. 4A to FIG. 4D are optical analysis results of electronic devices under optical film layers with different backlight modules 200. Measurement. These optical analysis results may be, for example, the results obtained after measurement by a conoscopic lens, but are not limited thereto. For example, the optical analysis results graph can be measured or analyzed using Conoscope, BM5A, Conometer80U or other suitable instruments, but not limited thereto.

It should be noted that the optical analysis results in FIGS. 4A to 4D may include the azimuth φ (the azimuth angle from 0° to 360° in the figure) and the inclination θ (the inclination angle from 0° to 80° in the figure). The inclination angle θ is, for example, an included angle with the normal direction of the panel 100 , and an inclination angle θ of 0 degrees may represent a vertical direction to the upper surface of the panel 100 . The azimuth angle φ is, for example, an angle parallel to the direction of the upper surface of the panel 100. The position where the azimuth angle φ is 90 degrees may roughly correspond to the position of the light incident surface ES (as shown in FIG. 2 ) of the light guide plate 10, and the azimuth angle φ The position at 270 degrees may roughly be the position corresponding to the opposite surface BS of the light incident surface ES (as shown in FIG. 2 ) of the light guide plate 10 . In addition, ^the color scales on the right side of Figures 4A to 4D represent different ranges of luminance per unit area (cd/m ² ). The disclosure is not limited thereto, and the luminance value per unit area may vary according to the design of the panel 100 or other factors.

As mentioned above, FIG. 4A to FIG. 4D are the optical analysis results of the electronic devices under the optical film layer with different backlight modules 200 respectively. For example, when the backlight module only includes the light guide plate 10, the optical analysis results of the measured electronic device are shown in FIG. 4A; When using the first optical element 11, the optical analysis results of the measured electronic device are shown in Figure 4B; when the backlight module, in addition to the light guide plate 10, it also includes the first optical element 11 and the When the second optical element 12 is used, the optical analysis results of the measured electronic device are shown in Figure 4C; when the backlight module, in addition to the light guide plate 10, it also includes the first optical element 11, the second optical When the component 12 and the third optical component 13 are used, the optical analysis results of the measured electronic device are 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 part of the light with a luminance value per unit area above 2.5E+04 cd/ ^m2 can be located approximately at the azimuth angle φ is between 240 degrees and 310 degrees, and the inclination angle θ is approximately between 60 degrees and 80 degrees, but not limited thereto. In other words, after the light source 20 emits light to the light guide plate 10 , the light may first be concentrated on the position of the surface BS opposite to the light incident surface ES. When the above-mentioned first optical element 11, second optical element 12 and third optical element 13 are sequentially arranged on the light guide plate 10 in the backlight module 200, the optical analysis results can be shown in sequence, for example, in FIG. 4B to FIG. 4D modulation. In detail, as shown in FIG. 4B, when the light passes through the light guide plate 10 and the first optical element 11, the light can be roughly divided into two parts by the first optical element 11 (the lower left part and the lower right part in FIG. 4B, for example). part), where the luminance value per unit area in the lower left part is greater than 2.5E+04 cd/ ^m2 , which roughly corresponds to the azimuth angle φ between about 230 degrees and 250 degrees, and the inclination angle θ is about 60 degrees to The position between the ranges between 80 degrees, the part in the lower right part where the brightness value per unit area is greater than 2.5E+04 cd/ ^m2 can roughly correspond to the azimuth angle φ between about 300 degrees and 320 degrees, and the inclination angle θ is approximately a position in the range of 60 degrees to 80 degrees, but is not limited thereto. As shown in FIG. 4C, when the light passes through the light guide plate 10, the first optical element 11 and the second optical element 12, the light splitting of the two parts (lower left part and lower right part) in FIG. the closer the inclination angle θ is to 0 degrees), for example, the two parts as described above in FIG. The inclination angle θ is about 20 degrees to 40 degrees, but not limited thereto. In other words, after the light passes through the second optical element 12 , the split light of the two parts will be concentrated towards the normal viewing angle. In addition, as shown in Figure 4D, when the light passes through the light guide plate 10, the first optical element 11, the second optical element 12, and the third optical element 13, the light splitting of the above two parts can be concentrated together, for example, so that the light can be concentrated to the front viewing angle of the electronic device. Through the relative design of the above-mentioned 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 disclosure, the electronic device can have the characteristic of concentrating light toward the normal viewing angle, The backlight module can be used for anti-peeping purposes, or can increase the brightness of the front viewing angle to reduce energy consumption or improve contrast.

FIG. 5 is a cross-sectional view of an electronic device according to an embodiment of the present disclosure. Wherein, the electronic device in FIG. 5 is similar to that in 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 element 11 and the second optical element 12, or disposed between the second optical element 12 and the third optical element. Between elements 13. In some embodiments, the adhesive layer 30 can 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 on the first optical element 11, the second optical element 12, the third optical element 13, and the first diffusion element 14 respectively. between. In some embodiments, the first optical element 11, the second optical element 12, the third optical element 13 and/or the diffusion element 14 can be bonded to each other through the adhesive layer 30 to form an optical film set, but not limited thereto .

In some embodiments, the adhesive layer 30 includes light-curable adhesive material, heat-curable adhesive material, photothermal-curable adhesive material, moisture-curable adhesive material, adhesive tape, other suitable materials, or a combination of the foregoing, but 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), optically transparent resin ( optical clear resin, OCR), other suitable materials or a combination of the above, but not limited thereto. The arrangement of the adhesive layer 30 can reduce the relative positional deviation between the elements of each layer, or reduce the assembly procedure.

FIG. 6 is a cross-sectional view of an electronic device according to an embodiment of the present disclosure. Wherein, the electronic device in FIG. 6 is similar to that in 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 diffusion element 14 can be disposed between the grating element 16 and the third optical element 13 . In other embodiments (not shown), an adhesive layer can be optionally provided between the grating element 16 and the diffusion element 14 to adhere to each other. In some embodiments, the grating element 16 may include a light control film (Advanced light control film, ALCF), a view control film (View control film, VCF) or other suitable light control layers, but is not limited thereto. In some embodiments, the grating element 16 can 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 present disclosure. Wherein, the electronic device in FIG. 7 is similar to that in 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 element 13 and the panel 100 , for example. In some embodiments, the aforementioned diffusing element 14 and/or grating element 16 can be selectively disposed between the reflective composite layer 17 and the third optical element 13, and the grating element 16 can be disposed between the reflective composite layer 17 and the diffusing element, for example. Between elements 14. In other embodiments (not shown), an adhesive layer can be optionally provided between the reflective composite layer 17 and the grating element 16 or between the grating element 16 and the diffusion element 14 to adhere to each other, but is not limited thereto. In some embodiments, the reflective composite layer 17 may include dual brightness enhancement film (DBEF) and reflective polarizer film (Advanced 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 present disclosure. Wherein, the electronic device in FIG. 8 is similar to that in 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 element 402. The light absorbing layer 401 may be disposed under the light guide plate 10, for example, that is, the light guide plate 10 may be disposed between the light absorbing layer 401 and the panel. Between 100. In some embodiments, the fourth optical element 402 can be disposed between the light guide plate 10 and the light absorbing layer 401 , for example. In some embodiments, there may be air between the fourth optical element 402 and the light guide plate 10 . In some embodiments, the light guide plate 10 can be disposed between the fourth optical element 402 and the panel 100 . In some embodiments, the fourth optical element 402 may have a fourth pleated structure 4021, and the fourth pleated structure 4021 faces, for example, the light guide plate 10. More specifically, the fourth pleated structure 4021 may have a plurality of fourth bars The strip-shaped structure 4021a and a surface 402b are opposite to the plurality of fourth strip-shaped structures 4021a, and the so-called fourth strip-shaped structure 4021 faces the light guide plate 10 because the fourth strip-shaped structure 4021a is closer to the light guide plate 10 than the surface 402b. In some embodiments, the light-emitting elements 201 are arranged along the first direction Y, and the extension direction of the fourth melon structure 4021 is, for example, perpendicular to the first direction Y, but is not limited thereto. The “perpendicular” means that the angle between the extending direction of the fennel structure and the first direction Y is between 87° and 93° (87°≦angle≦93°). In more detail, the fourth 稜鏡 structure 4021 can have a plurality of fourth strip structures 4021a, and the extension direction of the so-called fourth 稜鏡 structure 4021 is the fourth strip structure 4021a of the fourth 稜鏡 structure 4021 direction of extension. In some embodiments, the fourth strip structure 4021a of the fourth 稜鏡 structure 4021 can have a fourth vertex angle θ4, and the fourth vertex angle θ4 can be between 87° and 93° (87°≦θ4≦93 °) or between 89° and 91° (89°≦θ4≦91°), but not limited thereto. In some embodiments, the material or 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 , and details will not be repeated here.

As shown in the backlight module 200 of FIG. 8 , in some embodiments, the reflectance of the light absorbing layer 401 can range from 0% to 25% (0%<reflectance≦25%), or between 0 % to 10% (0%<reflectance≦10%), but not limited thereto. In some embodiments, the absorbance of the light absorbing layer 401 can range from 75% to 100% (75%≦absorbance<100%), or between 90% to 100% (90%≦absorb rate <100%), but not limited to this. In some embodiments, the material of the light-absorbing layer 401 may include high-light-absorbing materials, low-reflection materials, or combinations 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 include 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 chemical vapor deposition process, coating process, evaporation process, electroplating process, sputtering process, sticking process, printing process, baking process or other suitable processes, but not limited to this. In some embodiments, the light-absorbing layer 401 can be used to reduce the chance of stray light emitted from the bottom surface of the light guide plate 10 (that is, the side close to the light-absorbing layer 401 ) being reflected back to the light guide plate 10, thereby reducing the brightness at a large viewing angle, or improving the positive The contrast of the viewing angle or the brightness of the positive viewing angle can be improved. For example, the normal direction Z of the panel 100 may be 0 degrees, and the normal viewing angle is within a range of plus or minus 30 degrees (or 40 degrees) between the normal direction Z of the panel 100 , but it is not limited thereto.

FIG. 9 is a cross-sectional view of an electronic device according to an embodiment of the present disclosure. Wherein, the electronic device in FIG. 9 is similar to that in FIG. 1 except for the following differences.

The backlight module 200 shown in FIG. 9 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, that is, the fourth optical element 402 may be disposed between the reflective structure 40 and the light guide plate 10. between. The reflective structure 40 may include a single layer structure or a composite layer structure. The material of the reflective structure 40 can refer to the above description of the reflective structure 40 in FIG. 1 , and will not be repeated here. In some embodiments, the reflective structure 40 may include a reflective polarizer film (Advanced polarizer film, APF), but is not limited thereto. In some embodiments, the fourth optical element 402 between the reflective structure 40 and the light guide plate 10 may have a fourth pleated structure 4021, and the fourth pleated structure 4021 faces the light guide plate 10, more specifically, the fourth The fringe structure 4021 can have a plurality of fourth strip structures 4021a and the surface 402b is opposite to the plurality of fourth strip structures 4021a, and the so-called fourth fringe structure 4021 faces the light guide plate 10, and the fourth strip structure 4021a is compared with the surface 402b It is closer to the light guide plate 10 . The fourth strip structure 4021a of the fourth ridge structure 4021 may have a fourth vertex angle θ4, and the structure or material of the fourth vertex angle θ4 may be as described in FIG. 8 above, and will not be repeated here.

FIG. 10A is a partial perspective view of an electronic device according to an embodiment of the present disclosure. Fig. 10B is a cross-sectional view of line segment I-I' in Fig. 10A. Wherein, the electronic device of this embodiment is similar to that of FIG. 1 except for the following differences.

In this embodiment, as shown in FIG. 10A , the third optical element 13 has a third 稜鏡 structure 131, and the third 稜鏡 structure 131 faces the panel 100 (as shown in FIG. 1 ), and the third 稜鏡 structure 131 can be There are a plurality of third strip structures 131a and a surface 131b opposite to the third strip structures 131a, wherein the extension direction of the third sliver structures 131 may be perpendicular to the first direction Y, for example.

In more detail, as shown in FIG. 10A, the third strip structure 131a may include a plurality of sharp-corner strip structures S1 and a plurality of round-corner strip structures S2, wherein the sharp-angle strip structures S1 and round-corner strip structures S2 are along the The first direction Y is arranged, and one of the plurality of strip structures S2 is disposed between two adjacent plurality of sharp-angled strip structures S1. In some embodiments, one to eight sharp-corner strip structures S1 can be disposed between two adjacent round-corner strip structures S2. For example, in FIG. 10A , two sharp-corner strip structures S1 are disposed between two adjacent round-corner strip structures S2 , but it is not limited thereto. In other words, in a cross-sectional view, as shown in FIG. 10B , the third stud structure 131a may include a plurality of sharp corner portions P1 and a plurality of round corner portions P2, and the sharp corner portions P1 and round corner portions P2 are along the first direction Y. Arranged, and one of the plurality of rounded corners P2 is arranged between two adjacent plural sharp corners P1, wherein the sharp corner strip structure S1 can correspond to the sharp corner part P1, and the rounded corner strip structure S2 can correspond to the circle Corner part P2. In some embodiments, one to eight sharp corner portions P1 can be disposed between two adjacent round corner portions P2. For example, in FIG. 10B , two sharp corner portions P1 can be disposed between two adjacent round corner portions P2 , but it is not limited thereto.

In addition, as shown in FIG. 10A and FIG. 10B , in the normal direction Z of the panel 100, the height of the rounded strip structure S2 (that is, the height from the top T2 of the rounded part P2 to the surface 131b of the third optical element 13) The height is less than the height of the pointed strip structure S1 (ie the height from the tip T1 of the pointed portion P1 to the surface 131b of the third optical element 13 ). In some embodiments, the height of the rounded strip structure S2 (that is, the height from the top T2 of the rounded portion P2 to the surface 131b of the third optical element 13 ) is different from the height of the pointed strip structure S1 (that is, the pointed portion P1 There is a height difference H1 between the top T1 of the third optical element 13 and the height of the surface 131b of the third optical element 13), wherein the height difference H1 is greater than 0 micrometers (µm) and less than or equal to 2 micrometers (µm) (that is, 0µm<height difference H1≦2µm), but not limited to this.

In some embodiments, as shown in FIG. 10B , the pointed portions P1 may respectively have a fifth vertex angle θ5, wherein the fifth vertex angle θ5 may be between 87° and 93° (87°≦fifth vertex angle θ5≦93°) or between 88° and 92° (88°≦the fifth vertex angle θ5≦92°), but not limited thereto. The rounded corner portions P2 may respectively have a curvature radius R, wherein the curvature radius R may be greater than or equal to 3 micrometers (µm) and less than or equal to 5 micrometers (µm) (ie 3µm≦curvature radius R≦5µm). In addition, in some embodiments, the pitch PI between two adjacent third strip structures 131a can be between 18 μm and 50 μm (18 μm≦pitch PI≦50 μm), wherein the “two adjacent The distance between the third bar-like structures "refers to the distance in the first direction Y between the top T1 of the sharp corner part P1 and the top T1 of the sharp corner part P1 adjacent to it, or refers to the sharp corner part P1 The distance in the first direction Y between the top end T1 of and the top end T2 of the adjacent fillet portion P2.

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 not limited to this. In some embodiments, the haze of the surface 131b of the third optical element 13 can be prepared by embossing, sandblasting 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 or a PET surface.

In this embodiment, as shown in FIG. 1, the backlight module 200 may further include a diffusing element 14 disposed on the third optical element 13, wherein the haze of the diffusing element 14 may be between 1% and 30%. Between (1%≦haze≦30%). In some embodiments, although not shown in the figure, 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 element 14 shown in FIG. 1, but include the diffusion element 14-1 as shown in FIG. 3A and FIG. Between the optical element 11 and the light guide plate 10, the haze of the diffusion element 14-1 can be between 80% and 100% (80%≦haze≦100%). In some embodiments, the diffusion element 14 can be used to disperse the light emitted by the light source 20 to make the brightness of the backlight module 200 more uniform; Not limited to this.

FIG. 11 is a three-dimensional schematic diagram of a third optical element according to an embodiment of the present disclosure. Wherein, the third optical element of FIG. 11 is similar to that of FIG. 10A except for the following differences.

As shown in FIG. 10A, the third strip-like structure 131a of the third 稜鏡 structure 131 can be a regular structure. In more detail, the third strip-like structure 131a can have a top edge e1, and the top edge e1 can 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 fennel structure 131a.

In this embodiment, as shown in FIG. 11, the third strip structure 131a of the third 稜鏡 structure 131 can be an irregular structure. In more detail, the third strip structure 131a can have a top side e2, and the top The side e2 may not be a straight line, for example, may include arcs or other irregular lines. In other words, there may be an angle between the top edge e2 and the extending direction of the third scalloped structure 131a.

Wherein, the top edge e1 of the third strip structure 131a in FIG. 10A refers to the continuation line of the top end T1 of the sharp corner portion P1 or the top end T2 of the rounded corner portion P2 in the direction X perpendicular to the first direction Y in FIG. 10B . Similarly, the top edge e2 of the third strip structure 131a in FIG. 11 refers to the continuation of the top T1 of the fingertip corner part P1 or the top T2 of the round corner part P2 in the direction X perpendicular to the first direction Y in FIG. 10B Wire.

The backlight module 200 of the present disclosure can be applied to various electronic devices that require a display panel, and the display panel can be, for example, a flexible display panel, a touch display panel, or a curved display panel. panel) or a tiled display panel, but not limited thereto. The electronic devices of the present disclosure can be, for example, monitors, mobile phones, notebook computers, video cameras, cameras, music players, mobile navigation devices, televisions and other electronic devices that need to display images, but the present disclosure is not limited thereto.

The above specific examples should be construed as merely illustrative and not restrictive of the remainder of the disclosure in any way.

100: panel 200: Backlight module 10: Light guide plate 11: The first optical element 111: The first 稜鏡 structure 111a: The first strip structure 111b: surface 12: Second optical element 121: The second structure 121a: Second strip structure 121b: surface 13: The third optical element 131: The third 稜鏡 structure 131a: The third strip structure 131b: surface 14: Diffusion element 14-1: Diffusion element 16: grating element 17: Reflective composite layer 20: light source 201: Light emitting element 30: Adhesive layer 40: Reflective structure 401: light absorbing layer 402: The fourth optical element 402b: surface 4021: The fourth structure 4021a: fourth strip structure S1: Pointed strip structure S2: rounded strip structure P1: sharp corner part P2: Fillet part T1, T2: top e1, e2: top edge H1: height difference R: radius of curvature PI: Pitch θ1: first vertex angle θ2: second vertex angle θ3: third vertex angle θ4: fourth vertex angle θ5: fifth vertex angle X: direction Y: the first direction Z: look down direction F1: frame F2: support frame CB: circuit board 126: reflective element θ: inclination φ: azimuth ES: incident surface BS: opposite side

FIG. 1 is a cross-sectional view of an electronic device according to an embodiment of the present disclosure. FIG. 2 is a three-dimensional schematic diagram of an electronic device according to an embodiment of the present disclosure. 3A and 3B are partial schematic diagrams of an electronic device according to an embodiment of the present disclosure. FIG. 4A to FIG. 4D are optical analysis results of an electronic device under different backlight module configurations according to an embodiment of the present disclosure. FIG. 5 is a cross-sectional view of an electronic device according to an embodiment of the present disclosure. FIG. 6 is a cross-sectional view of an electronic device according to an embodiment of the present disclosure. FIG. 7 is a cross-sectional view of an electronic device according to an embodiment of the present disclosure. FIG. 8 is a cross-sectional view of an electronic device according to an embodiment of the present disclosure. FIG. 9 is a cross-sectional view of an electronic device according to an embodiment of the present disclosure. FIG. 10A is a partial perspective view of an electronic device according to an embodiment of the present disclosure. Fig. 10B is a cross-sectional view of line segment I-I' in Fig. 10A. FIG. 11 is a three-dimensional schematic diagram of a third optical element according to an embodiment of the present disclosure.

none.

100: panel

200: Backlight module

10: Light guide plate

11: The first optical element

12: Second optical element

13: The third optical element

14: Diffusion element

20: light source

201: Light emitting element

40: Reflective structure

126: reflective element

F1: frame

F2: support frame

CB: circuit board

ES: incident surface

Y: the first direction

Z: look down direction

Claims (17)

An electronic device comprising: a panel; and A backlight module, set relative to the panel, and including: a light guide plate; A first optical element is arranged on the light guide plate and has a first stencil structure; a second optical element, disposed on the first optical element, and has a second 稜鏡 structure; and a third optical element, disposed on the second optical element, and has a third 稜鏡 structure; Wherein, the first pleated structure faces the light guide plate, and the second fret structure and the third fret structure face the panel. The electronic device according to claim 1, wherein the backlight module further includes a light source, the light source includes a plurality of light-emitting elements, and the light-emitting elements are arranged along a first direction, wherein the second light-emitting structure The extension direction is parallel to the first direction, and the extension directions of the first scalloped structure and the third scalloped structure are perpendicular to the first direction. The electronic device according to claim 1, wherein the first pleated structure has a first vertex angle, the second pleated structure has a second vertex angle, and the third pleated 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°. The electronic device according to claim 1, wherein a surface of the second optical element adjacent to the light guide plate is a rough surface, and the haze of the rough surface is between 3% and 15%. The electronic device according to claim 1, wherein the backlight module further includes a diffusing element disposed on the third optical element, wherein the haze of the diffusing element is between 5% and 50%. The electronic device according to claim 5, wherein the backlight module further comprises another diffusing element disposed between the first optical element and the light guide plate, wherein the haze of the another diffusing element is between 5 % to 50%. The electronic device according to 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 disposed on the second optical element element and the third optical element. The electronic device as claimed in claim 1, wherein the backlight module further includes a grating element disposed between the third optical element and the panel. The electronic device according to claim 1, wherein the backlight module further includes a reflective composite layer disposed between the third optical element and the panel. The electronic device as described in claim 1, wherein the backlight module further includes: a light absorbing layer, wherein the light guide plate is disposed between the light absorbing layer and the panel; and A fourth optical element is arranged between the light guide plate and the light absorbing layer, Wherein, the fourth optical element has a fourth scalloped structure, and the fourth scalloped structure faces the light guide plate. An electronic device comprising: a panel; and A backlight module, set relative to the panel, and including: a light guide plate; a first optical element arranged on the light guide plate; a second optical element disposed on the first optical element; and a third optical element, disposed on the second optical element, and has a third pleated structure and a surface opposite to the third pleated structure; Wherein, the third horn structure includes a plurality of sharp corners and a plurality of rounded corners, one of the plurality of rounded corners is arranged between two adjacent plural sharp corners, in the normal direction of the panel, A height of one of the rounded corners to the surface of the third optical element is smaller than a height of one of the sharp corners to the surface of the third optical element. The electronic device as claimed in claim 11, wherein the height of one of the rounded corners to the surface of the third optical element is the same as the height of one of the sharp corners to the surface of the third optical element There is a height difference between the heights of the surfaces, wherein the height difference is greater than 0 micrometers (µm) and less than or equal to 2 micrometers (µm). The electronic device according to claim 11, wherein each of the rounded corners has a radius of curvature, wherein the radius of curvature is greater than or equal to 3 micrometers (µm) and less than or equal to 5 micrometers (µm). The electronic device as claimed in claim 11, wherein one to eight of the sharp corners are disposed between two adjacent rounded corners. The electronic device according to claim 11, wherein the surface of the third optical element is a rough surface, and the haze of the rough surface is between 1% and 10%. The electronic device according to claim 11, wherein the backlight module further includes a diffusing element disposed on the third optical element, wherein the haze of the diffusing element is between 1% and 30%. The electronic device according to claim 11, wherein the backlight module further comprises another diffusing element disposed between the first optical element and the light guide plate, wherein the haze of the another diffusing element is between 80 % to 100%.

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