Backlight device and display device

Abstract

The invention discloses a backlight device which comprises a substrate, a light-emitting element, a first optical film, a second optical film and a third optical film. The light-emitting element is disposed on the substrate. The first optical film is disposed on the substrate and includes a first prism assembly extending along a first direction. The second optical film is arranged on the first optical film and comprises a second prism assembly extending along a second direction. The third optical film is arranged on the second optical film and comprises a third prism assembly extending along a third direction. Wherein the included angle between the first direction and the second direction is approximately between 30 degrees and 150 degrees, and the second direction is approximately parallel to the third direction.

Description

Technical Field

[0001] The present disclosure relates to an improvement of a backlight device of a display device. Background Art

[0002] Nowadays, most electronic devices are made with concentrated light sources by attaching privacy films to electronic devices to achieve privacy. However, the above methods still have disadvantages such as high energy consumption, high cost or low yield. In addition, current electronic devices still cannot have both high contrast and low side lobe, or have poor light package stability (i.e., the assembly error tolerance of the optical film is low).

[0003] Therefore, a new display device and backlight device are needed to improve the above problems. Summary of the invention

[0004] The present disclosure provides a backlight device, comprising a substrate, a light-emitting element, a first optical film, a second optical film and a third optical film. The light-emitting element is disposed on the substrate to provide a light source. The first optical film is disposed on the substrate and comprises a first prism assembly extending along a first direction. The second optical film is disposed on the first optical film and comprises a second prism assembly extending along a second direction. The third optical film is disposed on the second optical film and comprises a third prism assembly extending along a third direction. The angle between the first direction and the second direction is substantially between 30 degrees and 150 degrees, and the second direction is substantially parallel to the third direction.

[0005] The present disclosure further provides a display device, comprising a backlight device and a display panel. The backlight device comprises a substrate, a light-emitting element, a first optical film, a second optical film and a third optical film. The light-emitting element is disposed on the substrate to provide a light source. The first optical film is disposed on the substrate, and comprises a first prism component extending along a first direction. The second optical film is disposed on the first optical film, and comprises a second prism component extending along a second direction. The third optical film is disposed on the second optical film, and comprises a third prism component extending along a third direction. The angle between the first direction and the second direction is substantially between 30 degrees and 150 degrees, and the second direction is substantially parallel to the third direction. The display panel is disposed on the backlight device. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1A is a cross-sectional schematic diagram of a display device according to an embodiment of the present disclosure;

[0007] Figure 1B is a three-dimensional diagram of a display device according to an embodiment of the present disclosure;

[0008] Figure 2A is a three-dimensional schematic diagram of a first optical film according to an embodiment of the present disclosure;

[0009] Figure 2B yes Figure 2A A cross-sectional view of line segment II-II';

[0010] Figure 3A is a three-dimensional schematic diagram of a second optical film according to an embodiment of the present disclosure;

[0011] Figure 3B yes Figure 3A A cross-sectional view of line segment III-III';

[0012] Figure 4A is a three-dimensional schematic diagram of a third optical film according to an embodiment of the present disclosure;

[0013] Figure 4B yes Figure 4A The cross-sectional view of line segment IV-IV';

[0014] Figure 5 is a perspective view of a display device according to another embodiment of the present disclosure;

[0015] Figure 6 is a cross-sectional view of a display device according to another embodiment of the present disclosure.

[0016] Description of Reference Numerals

[0017] 1. Display device

[0018] 100. Display Panel

[0019] 200. Backlight device

[0020] 10. Substrate

[0021] 20. Light-emitting components

[0022] 11. The first optical film

[0023] 12. Second optical film

[0024] 13. The third optical film

[0025] 21. Photoluminescent subunit

[0026] 111. First prism assembly

[0027] 121. Second prism assembly

[0028] 131. Third prism assembly

[0029] D1, first direction

[0030] D2, Second Direction

[0031] D3. Third direction

[0032] 111a, first strip component

[0033] 121a, second strip component

[0034] 131a, third strip component

[0035] θ12, angle

[0036] 112. First Base Plate

[0037] 122. Second base plate

[0038] 132. Third Base Plate

[0039] 10a. Plane

[0040] 30. Light guide element

[0041] 40. Reflective element

[0042] 50. Circuit Board

[0043] 60. Rubber

[0044] e1, first edge

[0045] e2, second edge

[0046] e3, the third edge

[0047] e4, the fourth edge

[0048] e5, the fifth edge

[0049] e6, the sixth edge

[0050] P1, first vertex

[0051] P4, second vertex

[0052] P7, third vertex

[0053] P2, first end

[0054] P3, second end

[0055] P5, the third terminal

[0056] P6, the fourth end

[0057] P8, the fifth end

[0058] P9, the sixth end

[0059] θ1, first prism angle

[0060] θ2, the second prism angle

[0061] θ3, the third prism angle

[0062] d1, first spacing

[0063] d2, second spacing

[0064] d3, third spacing

[0065] 300. View Control Panel

[0066] 400, Touch unit DETAILED DESCRIPTION

[0067] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0068] Reference will now be made in detail to exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0069] Certain words are used throughout the specification and claims of this disclosure to refer to specific components. It should be understood by those skilled in the art that manufacturers of sensing devices may refer to the same components by different names. This document does not intend to distinguish between components that have the same function but different names. In the following specification and claims, the words "including", "comprising" and "comprising" are open-ended words and should therefore be interpreted as "including but not limited to...".

[0070] The directional terms mentioned herein, such as "up", "down", "front", "back", "left", "right", etc., are only referenced to the directions of the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the present disclosure. In the accompanying drawings, each figure depicts the general characteristics of the methods, structures and / or materials used in a particular embodiment. However, these drawings should not be interpreted as defining or limiting the scope or nature covered by these embodiments. For example, for clarity, the relative size, thickness and position of each film layer, region and / or structure may be reduced or enlarged.

[0071] A structure (or layer, component, substrate) described in the present disclosure is located above another structure (or layer, component, substrate), which may refer to the two structures being adjacent and directly connected, or it may refer to the two structures being adjacent but not directly connected. Indirect connection means that there is at least one intermediate structure (or intermediate layer, intermediate component, intermediate substrate, intermediate gap) between the two structures, the lower surface of one structure is adjacent to or directly connected to the upper surface of the intermediate structure, and the upper surface of the other structure is adjacent to or directly connected to the lower surface of the intermediate structure. The intermediate structure can be composed of a single-layer or multi-layer physical structure or a non-physical structure, without limitation. In the present disclosure, when a certain structure is disposed "on" other structures, it may refer to that a certain structure is "directly" on other structures, or that a certain structure is "indirectly" on other structures, that is, at least one structure is sandwiched between a certain structure and other structures.

[0072] The terms "about," "substantially," or "approximately" are generally interpreted as within 10% of a given value or range, or within 5%, 3%, 2%, 1% or 0.5% of a given value or range.

[0073] In addition, any two values ​​or directions used for comparison may have a certain error. If the first direction is perpendicular or "approximately" 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 or "approximately" parallel to the second direction, the angle between the first direction and the second direction may be between 0 degrees and 10 degrees.

[0074] The ordinal numbers used in the specification and claims, such as "first", "second", etc., are used to modify elements. They do not imply or represent any previous ordinal numbers of the element (or elements), nor do they represent the order of one element and another element, or the order of the manufacturing method. The use of these ordinal numbers is only used to make the element with a certain name clearly distinguishable from another element with the same name. The same words may not be used in the claims and the specification. Accordingly, the first component in the specification may be the second component in the claims.

[0075] In the present disclosure, the phrases “a given range is from a first value to a second value”, “a given range falls within the range from a first value to a second value” mean that the given range includes the first value, the second value and other values ​​therebetween.

[0076] It should be understood that according to the embodiments of the present disclosure, an optical microscope (OM), a scanning electron microscope (SEM), an α-step, an ellipsometer, or other suitable methods may be used to measure the depth, thickness, width, or height of each element, or the spacing or distance between elements. According to some embodiments, a scanning electron microscope may be used to obtain a cross-sectional structural image containing the element to be measured, and measure the depth, thickness, width, or height of each element, or the spacing or distance between elements.

[0077] In addition, the display device disclosed in the present disclosure can be applied to electronic devices, and the electronic devices may include imaging devices, assembly devices, backlight devices, antenna devices, splicing devices, touch electronic devices (touch display), curved electronic devices (curved display) or non-rectangular electronic devices (free shape display), but are not limited thereto. When the electronic device is an assembly device or a splicing device, the electronic device may include a gripping mechanism, but is not limited thereto. The electronic device may, for example, include liquid crystal, light emitting diode, fluorescence, phosphor, other suitable display media, or a combination of the foregoing, but is not limited thereto. The display device may be a non-self-luminous display device or a self-luminous display device. The antenna device may be a liquid crystal antenna device or a non-liquid crystal antenna device, and the sensing device may be a sensing device for sensing capacitance, light, heat or ultrasound, but is not limited thereto. The splicing device may, for example, be a display splicing device or an antenna splicing device, but is not limited thereto. It should be noted that the electronic device may be any combination of the foregoing, but is not limited thereto. In addition, the electronic device may be a bendable or flexible electronic device. It should be noted that the electronic device may be any combination of the above, but is not limited thereto. In addition, the appearance of the electronic device may be rectangular, circular, polygonal, a shape with curved edges or other suitable shapes. The electronic device may have peripheral systems such as a drive system, a control system, a light source system, a shelf system, etc. to support the display device, the antenna device or the splicing device.

[0078] It should be noted that the following embodiments can replace, reorganize, or mix features in several different embodiments to complete other embodiments without departing from the spirit of the present disclosure. Features between embodiments can be mixed and matched as long as they do not violate the spirit of the invention or conflict with each other.

[0079] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meanings as commonly understood by those skilled in the art to which the present 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 relevant technology and the present disclosure, and should not be interpreted in an idealized or overly formal manner unless specifically defined in the embodiments of the present disclosure.

[0080] Furthermore, the term "adjacent" in the specification and claims is used to describe being near each other, but does not necessarily mean being in contact with each other.

[0081] In addition, the descriptions of "when..." or "when..." in this disclosure indicate "at the moment, before or after", etc., and are not limited to situations that occur at the same time, which is hereby stated in advance. The descriptions of "disposed on..." and the like in this disclosure indicate the corresponding positional relationship between two elements, and are not limited to whether the two elements are in contact with each other, unless otherwise specified, which is hereby stated in advance. In addition, when multiple effects are recorded in this disclosure, if the word "or" is used between the effects, it means that the effects can exist independently, but it does not exclude that multiple effects can exist at the same time.

[0082] Figure 1A is a cross-sectional schematic diagram of a display device according to an embodiment of the present disclosure. Figure 1B is a three-dimensional diagram of a display device according to an embodiment of the present disclosure. It should be noted that: Figure 1B Removed Figure 1A In the embodiment of the present invention, the components (substrate 10) are placed on the substrate 10 to make the features of other components more obvious. In addition, the relative relationship of the components such as "top", "bottom", "above" or "below" in the following text refers to the relative position in the Z direction. In addition, it should be noted that the description of "an object is disposed on another object" in this article may mean that the object is disposed at a certain position of the other object, and does not mean that the object must be disposed above the other object.

[0083] like Figure 1A and 1B As shown, the display device 1 of the present disclosure may include a display panel 100 and a backlight device 200, and the display panel 100 may be disposed on the backlight device 200. The backlight device 200 may include a substrate 10, a light-emitting element 20, a first optical film 11, a second optical film 12, and a third optical film 13. In the normal direction of the substrate 10 (for example, the Z direction), the light-emitting element 20 is disposed on the substrate 10, the first optical film 11 is disposed on the substrate 10, the second optical film 12 is disposed on the first optical film 11, and the third optical film 13 is disposed on the second optical film 12.

[0084] The light-emitting element 20 is used to provide a light source. The light-emitting element 20 may include at least one light-emitting subunit 21; for the convenience of explanation, the following is an example in which the light-emitting element 20 includes a plurality of light-emitting subunits 21, wherein the plurality of light-emitting subunits 21 may be arranged, for example, along the Y direction, and the Y direction is perpendicular to the Z direction. The first optical film 11 includes a first prism component 111, wherein the first prism component 111 extends along a first direction D1, wherein the first direction D1 may be parallel to the Y direction, or may be substantially parallel to the Y direction. The second optical film 12 includes a second prism component 121, wherein the second prism component 121 extends along a second direction D2. The third optical film 13 includes a third prism component 131, wherein the third prism component 131 extends along a third direction D3. In more detail, the first prism component 111 may include a plurality of first strip components 111a, each of which extends in the direction D1. The second prism assembly 121 includes a plurality of second strip-shaped assemblies 121a, each of which extends in the second direction D2. The third prism assembly 131 includes a plurality of third strip-shaped assemblies 131a, each of which extends in the third direction D3. The first direction D1, the second direction D2, and the third direction D3 may be perpendicular to the Z direction, but are not limited thereto. In addition, the first direction D1, the second direction D2, and the third direction D3 may be located on the same horizontal plane (e.g., the XY plane), but are not limited thereto.

[0085] In one embodiment, the first direction D1 and the second direction D2 may have an included angle θ12 (eg Figure 1B As shown). In one embodiment, the angle θ12 may be roughly between plus or minus 30 degrees and 90 degrees, that is, the angle θ12 may be between 30 degrees and 150 degrees (that is, 30°≦θ12≦150°), and is not limited thereto. In one embodiment, the angle θ12 may be roughly between plus or minus 45 degrees and 90 degrees, that is, the angle θ12 may be between 45 degrees and 150 degrees (that is, 45°≦θ12≦150°), and is not limited thereto. In one embodiment, the angle θ12 may be roughly between plus or minus 60 degrees and 90 degrees, that is, the angle θ12 may be between 60 degrees and 120 degrees (that is, 60°≦θ12≦120°), and is not limited thereto. In addition, in one embodiment, the second direction D2 and the third direction D3 may be roughly parallel.

[0086] In one embodiment, in the normal direction (Z) of the substrate 10, the tip portions (e.g., the narrower end) of the first prism component 111 and the second prism component 121 may face the same direction, for example, the first prism component 111 and the second prism component 121 may face the substrate 10, but not limited thereto. The third prism component 131 and the second prism component 121 may face opposite directions, for example, the third prism component 131 may face the display panel 100, but not limited thereto. In more detail, the first prism component 111 may have a first bottom plate 112, and the first strip component 111a is disposed on the first bottom plate 112. The second prism component 121 may have a second bottom plate 122, and the second strip component 121a is disposed on the second bottom plate 122. The third prism component 131 may have a third bottom plate 132, and the third strip component 131a is disposed on the third bottom plate 132. Here, “the first prism component 111 is facing the substrate 10” means that the first strip component 111a is closer to the substrate 10 than the first base plate 112, the second prism component 121 is facing the substrate 10 means that the second strip component 121a is closer to the substrate 10 than the second base plate 122, and the third prism component 131 is facing the display panel 100 means that the third strip component 131a is closer to the display panel 100 than the third base plate 132.

[0087] The display device 1 of the present disclosure can provide a high contrast effect through the configuration of the first prism assembly 111, the second prism assembly 121 and the third prism assembly 131. Alternatively, the light emitted by the backlight device 200 can be concentrated toward the front viewing angle, and the privacy requirement can be met without additionally attaching or setting a privacy film or using a collimated backlight module with low yield and / or high cost, or the side view light intensity can be reduced.

[0088] Next, the characteristics of each element are described.

[0089] First, the display panel 100 is described. In the present disclosure, although not shown in detail, the display panel 100 may include upper and lower substrates, a display unit, a seal, an alignment film, a polarizing plate, a light shielding layer, a color filter layer and / or a driving element, but is not limited thereto.

[0090] Next, the substrate 10 of the backlight device 200 is described. The substrate 10 may be, for example, a substrate, a frame or a housing, and may have conductive or insulating properties, but is not limited thereto. In one embodiment, the substrate 10 may be, for example, a frame or a housing including iron parts, but is not limited thereto. In one embodiment, when the substrate 10 is a frame or a housing, the substrate 10 may also have a side portion, which may extend along the normal direction (Z) to be adjacent to the light-emitting element 20, the first optical film 11, the second optical film 12, and the third optical film 13, but is not limited thereto. In one embodiment, the substrate 10 may include a plane 10a, and the light-emitting element 20, the first optical film 11, the second optical film 12, and the third optical film 13 may be directly or indirectly located on the plane 10a; for example, in one embodiment, the backlight device 200 may also include a circuit board 50 (for example, but not limited to, a flexible circuit board), wherein the circuit board 50 may be located on the plane 10a, and the light-emitting element 20 may be located on the circuit board 50, but is not limited thereto. In one embodiment, the adhesive 60 (which may be any type of adhesive) may be disposed between the light emitting element 20 and the substrate 10 , but is not limited thereto.

[0091] Next, the light emitting element 20 of the backlight device 200 is described. In one embodiment, the type of the light emitting subunit 21 of the light emitting element 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 light emitting diode (micro LED), or a quantum dot light emitting diode (quantum dot LED, including QLED, QDLED), fluorescence, phosphor, or other suitable materials, or a combination thereof, but is not limited thereto.

[0092] Next, the first optical film 11, the second optical film 12 and the third optical film 13 of the backlight device 200 are described. In one embodiment, the first optical film 11 and the second optical film 12 are in contact with each other, and the second optical film 12 and the third optical film 13 are in contact with each other. In another embodiment, the first optical film 11 and the second optical film 12 are in contact with each other, while the second optical film 12 and the third optical film 13 are not in contact, or the first optical film 11 and the second optical film 12 are not in contact, while the second optical film 12 and the third optical film 13 are in contact with each other. In one embodiment, when the first optical film 11 and the second optical film 12 are not in contact, a glue material may be provided between the first optical film 11 and the second optical film 12, or when the second optical film 12 and the third optical film 13 are not in contact, a glue material may be provided between the second optical film 12 and the third optical film 13, for example, wherein the glue material may be, for example, an optical glue material, but may also be other types of glue materials.

[0093] In one embodiment, the backlight device 200 further includes a light guide element 30 disposed adjacent to the light emitting element 20. The light guide element 30 may be disposed on the substrate 10 in the normal direction (Z) of the substrate 10. In one embodiment, the light emitting element 20 may be, for example, disposed on one side of the light incident surface of the light guide element 30. In one embodiment, the light guide element 30 may be, for example, a light guide plate, but is not limited thereto.

[0094] In one embodiment, the backlight device 200 further includes a reflective element 40. In the normal direction (Z) of the substrate 10, the reflective element 40 may be disposed between the substrate 10 and the light guide element 30. In one embodiment, the reflective element 40 may be used to reflect the light emitted from the bottom of the light guide element 30, so that the light travels toward the display panel 100 to improve the utilization rate of the light. In one embodiment, the material of the reflective element 40 is not particularly limited, for example, it may include but is not limited to metal, white ink, other reflective materials or a combination thereof. Among them, 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 element 40 may include a single-layer or multi-layer film reflector. The present disclosure is not limited thereto. In one embodiment, the circuit board 50 and the reflective element 40 may be connected together by a glue 60, but is not limited thereto.

[0095] Then match FIG. 2A to FIG. 4B The detailed structures of the first optical film 11, the second optical film 12, and the third optical film 13 of the present disclosure are described. Figure 1A and Figure 1B As a reference aid.

[0096] Figure 2A 4 is a schematic three-dimensional diagram of a first optical film according to an embodiment of the present disclosure. Figure 2B yes Figure 2A Cross-sectional view of line segment II-II'. Figure 3A 4 is a schematic three-dimensional diagram of a second optical film according to an embodiment of the present disclosure. Figure 3B yes Figure 3A Cross-sectional view of line segment III-III'. Figure 4A 4 is a schematic three-dimensional diagram of a third optical film according to an embodiment of the present disclosure. Figure 4B yes Figure 4A It should be noted that, Figure 2A , Figure 3A or Figure 4A Only the light emitting element 20 and the first optical film 11, the second optical film 12 or the third optical film 13 are shown, and Figure 2A , Figure 3A and Figure 4A The light emitting element 20 is only used to describe the arrangement direction of the light emitting sub-units 21.

[0097] First, the first optical film 11 is described. Figure 2A As shown, the extension direction of the first prism assembly 111 of the first optical film 11 is the first direction D1, which is parallel or substantially parallel to the extension direction (Y) of the light-emitting sub-unit 21. More specifically, the "extension direction of the first prism assembly 111" can be regarded as the extension direction of the first strip assembly 111a. In one embodiment, the first optical film 11 can be allowed to have an offset error within plus or minus 5 degrees during assembly. For example, when the first optical film 11 is assembled on the substrate 10, there can be an angle between the first direction D1 and the extension direction (Y) of the light-emitting sub-unit 21, wherein the angle is less than or equal to plus or minus 5 degrees, and is not limited thereto.

[0098] like Figure 2B As shown, in the cross-sectional view, each first strip component 111a of the first prism component 111 may include a plurality of edges, a first edge e1 and a second edge e2, wherein the first edge e1 and the second edge e2 may intersect at a first vertex P1 to form the first strip component 111a, and the first end P2 and the second end P3 of the first edge e1 and the second edge e2 may be connected to other first strip components 111a, respectively, but not limited thereto. In addition, each first strip component 111a of the first prism component 111 may have a first prism angle θ1, and the “first prism angle θ1” may be, for example, the angle between the first edge e1 and the second edge e2. In one embodiment, the first strip component 111a may be, for example, an isosceles triangle (but in other embodiments, it may also be any other shape having an angle), in which case the first edge e1 and the second edge e2 have the same length, and the first prism angle θ1 may be regarded as the vertex angle of the isosceles triangle, but not limited thereto. In one embodiment, the first prism angle θ1 may be between 30 degrees and 110 degrees (i.e., 30°≦θ1≦110°), but is not limited thereto. In one embodiment, the first prism angle θ1 may be between 40 degrees and 100 degrees (i.e., 40°≦θ1≦100°), but is not limited thereto. In one embodiment, the first prism angle θ1 may be between 50 degrees and 90 degrees (i.e., 50°≦θ1≦90°), but is not limited thereto.

[0099] In addition, if Figure 2B As shown, in the arrangement direction (e.g., X direction) of the plurality of first strip-shaped components 111a, there may be a first spacing d1 between the first vertices P1 of two adjacent ones of the plurality of first strip-shaped components 111a. In one embodiment, the first spacing d1 may be between 10 microns and 30 microns (i.e., 10 μm≦d1≦30 μm), but is not limited thereto. In one embodiment, the first spacing d1 may be between 15 microns and 20 microns (i.e., 15 μm≦d1≦20 μm), but is not limited thereto. In one embodiment, the first spacing d1 may be between 17 microns and 19 microns (i.e., 17 μm≦d1≦19 μm), for example, 18 microns, but is not limited thereto.

[0100] Next, the second optical film 12 will be described. Figure 3A As shown, in one embodiment, the extension direction of the light-emitting subunit 21 is substantially parallel to the first direction D1, the extension direction of the second prism assembly 121 of the second optical film 12 is the second direction D2, and the second direction D2 and the first direction D1 may have an angle θ12 (shown in Figure 1B ).exist Figure 3A In the embodiment, the angle θ12 is, for example, 90 degrees, but it may also be other angles (such as Figure 5 More specifically, the "extending direction of the second prism assembly 121" can be regarded as the extending direction of the second strip assembly 121a. In one embodiment, the second optical film 12 can be allowed to have an offset error within plus or minus 10 degrees during assembly, but is not limited thereto.

[0101] like Figure 3B As shown, in the cross-sectional view, each second strip component 121a of the second prism component 121 may include a plurality of edges, a third edge e3 and a fourth edge e4, wherein the third edge e3 and the fourth edge e4 may intersect at the second vertex P4 to form the second strip component 121a, and the third end P5 and the fourth end P6 of the third edge e3 and the fourth edge e4 may be connected to other second strip components 121a respectively, but not limited thereto. In addition, each second strip component 121a of the second prism component 121 may have a second prism angle θ2, and the “second prism angle θ2” may be, for example, the angle between the third edge e3 and the fourth edge e4. In one embodiment, the second strip component 121a may be, for example, an isosceles triangle (but in other embodiments, it may also be any other shape having an angle), in which case the third edge e3 and the fourth edge e4 have the same length, and the second prism angle θ2 may be regarded as the vertex angle of the isosceles triangle, but not limited thereto. In one embodiment, the second prism angle θ2 may be between 30 degrees and 140 degrees (i.e., 30°≦θ2≦140°), but is not limited thereto. In one embodiment, the second prism angle θ2 may be between 40 degrees and 130 degrees (i.e., 40°≦θ2≦130°), but is not limited thereto. In one embodiment, the second prism angle θ2 may be between 50 degrees and 120 degrees (i.e., 50°≦θ2≦120°), but is not limited thereto.

[0102] In addition, if Figure 3BAs shown, in a horizontal direction (e.g., Y direction), there may be a second spacing d2 between two adjacent second vertices P4 of the plurality of second strip-shaped components 121a. In one embodiment, the second spacing d2 may be between 40 microns and 60 microns (i.e., 40 μm≦d2≦60 μm), but is not limited thereto. In one embodiment, the second spacing d2 may be between 45 microns and 55 microns (i.e., 45 μm≦d2≦55 μm), but is not limited thereto. In one embodiment, the second spacing d2 may be between 47.5 microns and 52.5 microns (i.e., 47.5 μm≦d2≦52.5 μm), for example, 50 microns, but is not limited thereto.

[0103] Next, the third optical film 13 will be described. Figure 4A As shown, in one embodiment, the extension direction of the light-emitting subunit 21 is substantially parallel to the first direction D1, the extension direction of the third prism assembly 131 of the third optical film 13 is the third direction D3, and the third direction D3 and the first direction D1 may have an angle (not shown in the figure), which may be substantially the same as the angle θ12 between the second direction D2 and the first direction D1 (shown in FIG. Figure 1B ), but not limited to. Figure 3A In the embodiment, the angle is, for example, 90 degrees, but is not limited thereto. More specifically, the "extension direction of the third prism assembly 131" can be regarded as the extension direction of the third strip assembly 131a. In one embodiment, the third optical film 13 can be allowed to have an offset error within plus or minus 10 degrees during assembly, but is not limited thereto.

[0104] like Figure 4BAs shown, in the cross-sectional view, each third strip component 131a of the third prism component 131 may include a plurality of edges, a fifth edge e5 and a sixth edge e6, wherein the fifth edge e5 and the sixth edge e6 may intersect at a third vertex P7 to form the third strip component 131a, and the fifth end P8 and the sixth end P9 of the fifth edge e5 and the sixth edge e6 may be connected to other third strip components 131a, respectively, but not limited thereto. In addition, each third strip component 131a of the third prism component 131 may have a third prism angle θ3, and the “third prism angle θ3” may be, for example, the angle between the fifth edge e5 and the sixth edge e6. In one embodiment, the third strip component 131a may be, for example, an isosceles triangle (but in other embodiments, it may also be any other shape having an angle), in which case the fifth edge e5 and the sixth edge e6 have the same length, and the third prism angle θ3 may be regarded as the vertex angle of the isosceles triangle, but not limited thereto. In one embodiment, the third prism angle θ3 may be between 30 degrees and 140 degrees (i.e., 30°≦θ3≦140°), but is not limited thereto. In one embodiment, the third prism angle θ3 may be between 40 degrees and 130 degrees (i.e., 40°≦θ3≦130°), but is not limited thereto. In one embodiment, the third prism angle θ3 may be between 50 degrees and 120 degrees (i.e., 50°≦θ3≦120°), but is not limited thereto.

[0105] Another example Figure 4B As shown, in the horizontal direction (e.g., Y direction), there may be a third spacing d3 between the third vertices P7 of two adjacent third strip components 131a. In one embodiment, the third spacing d3 may be between 20 microns and 28 microns (i.e., 20 μm≦d3≦28 μm), but is not limited thereto. In one embodiment, the third spacing d3 may be between 22.5 microns and 26.5 microns (i.e., 22.5 μm≦d3≦26.5 μm), but is not limited thereto. In one embodiment, the third spacing d3 may be between 23 microns and 25 microns (i.e., 23 μm≦d3≦25 μm), for example, 24 microns, but is not limited thereto.

[0106] Please refer again Figure 2B , Figure 3B and Figure 4B .

[0107] In one embodiment, the second prism angle θ2 or the third prism angle θ3 may be greater than the first prism angle θ1 (i.e., θ1<θ2, or θ1<θ3), and is not limited to this. Advantages of this design include, for example, allowing light to be concentrated toward a positive viewing angle or improving the contrast of the display device 1, and are not limited to this.

[0108] In one embodiment, the second pitch d2 may be greater than the third pitch d3, and the third pitch d3 may be greater than the first pitch d1 (i.e., d1 < d3 < d2), but is not limited thereto. The advantages of this design include, for example, concentrating light toward the front view angle or improving the contrast ratio of the display device 1, but are not limited thereto.

[0109] In one embodiment, the refractive index n1 of the first optical film 11, the refractive index n2 of the second optical film 12, or the refractive index n3 of the third optical film 13 may be between 1.5 and 1.7 (i.e., 1.5 ≤ n1 ≤ 1.7, or 1.5 ≤ n2 ≤ 1.7, or 1.5 ≤ n3 ≤ 1.7). In the present disclosure, the first optical film 11, the second optical film 12, and the third optical film 13 may be prepared using the same or different materials. Therefore, the refractive index n1, the refractive index n2, and the refractive index n3 may be the same or different. In one embodiment, the refractive index n3 of the third optical film 13 may be greater than the refractive index n2 of the second optical film 12 (i.e., n2 < n3). The advantages of this design include, for example, concentrating light toward the front view angle or improving the contrast ratio of the display device 1, but are not limited thereto.

[0110] In one embodiment, the positions of the second vertex P4 of the second strip component 121a of the second prism assembly 121 and the third vertex P7 of the third strip component 131a of the third prism assembly 131 in the horizontal direction (Y) may correspond to each other (for example, the second vertex P4 and the third vertex P7 may be aligned with each other) or not correspond (for example, the second vertex P4 and the third vertex P7 may not need to be aligned), but are not limited thereto.

[0111] In one embodiment, the materials of the first optical film 11, the second optical film 12 and the third optical film 13 may include transparent materials, but are not limited thereto. In one embodiment, the first optical film 11, the second optical film 12 and the third optical film 13 may include a base plate (e.g., a first base plate 112, a second base plate 122 and a third base plate 132) and corresponding prism components (e.g., a first prism component 111, a second prism component 121 and a third prism component 131). The materials of the base plate or the prism components may include polycarbonate (PC), polyimide (PI), polyethyleneterephthalate (PET), polyether polyol (POP), polymethylmethacrylate (PMMA), cycloolefin polymer (COP), rubber, glass, other suitable materials or combinations thereof, but are not limited thereto. In one embodiment, the material of the prism assembly may include light-curing adhesive, heat-curing adhesive, light-heat-curing adhesive, moisture-curing adhesive, other suitable materials or a combination thereof, and is not limited thereto. In one embodiment, the material of the prism assembly may include optical clear adhesive (OCA), optical clear resin (OCR), acrylic resin, other suitable materials or a combination thereof, and is not limited thereto.

[0112] Through the above design, in one embodiment, the side view light intensity (side lobe) of the backlight device 200 may be between 0.1% and 10% (i.e., 0.1%≦side lobe≦10%), and is not limited thereto. In one embodiment, the side view light intensity of the backlight device 200 may be between 0.1% and 5% (i.e., 0.1%≦side lobe≦5%), and is not limited thereto. In one embodiment, the side view light intensity of the backlight device 200 may be between 0.1% and 3% (i.e., 0.1%≦side lobe≦3%), and is not limited thereto. In one embodiment, the side view light intensity of the backlight device 200 may be between 0.1% and 1% (i.e., 0.1%≦side lobe≦1%), and is not limited thereto. Here, "side view light intensity" may, for example, refer to the light intensity perceived by the user in the horizontal section (e.g., the side section) of the display device 1 in the viewing direction, but is not limited thereto.

[0113] In one embodiment, the side-view light intensity of the backlight device 200 can be expressed as the formula:

[0114] Side view light intensity = (Max)% - (45D)%;

[0115] Among them, Max is the maximum side view light intensity position, which is located in the range of about 45 degrees to 90 degrees where the user's viewing angle deviates from the exact middle of the horizontal section of the display device 1, 45D represents the position where the user's viewing angle deviates from the exact middle of the horizontal section of the display device 1 by about 45 degrees, (Max)% is the light intensity at the maximum side view light intensity position, and (45D)% represents the light intensity at the position where the side view direction deviates from the center viewing angle direction by about 45 degrees, and is not limited to this.

[0116] It can be seen from this that the present disclosure can significantly reduce the side light leakage problem of the backlight device 200. Therefore, the display device 1 of the present disclosure can meet the privacy requirements or reduce the side view light intensity without the need to additionally attach or set a privacy film, or make the backlight module have a higher yield and / or lower cost.

[0117] The display device 200 of the present disclosure may have different implementation forms. Figure 5 is a three-dimensional diagram of a display device according to another embodiment of the present disclosure, and please refer to Figure 1A .

[0118] exist Figure 1A In the embodiment, the extension direction of the second prism assembly 121 (ie, the second direction D2) or the extension direction of the third prism assembly 131 (ie, the third direction D3) is perpendicular to the extension direction of the first prism assembly 111 (ie, the first direction D1). Figure 5 In the case where the second direction D2 or the third direction D3 is not perpendicular to the first direction D1, and the second direction D2 and the third direction D3 may be substantially parallel; in other words, Figure 5 In the embodiment, the first direction D1 is parallel to the Y direction, and the second direction D2 and the third direction D3 are different from the X direction and the Y direction.

[0119] The display device 1 of the present disclosure may also have different implementation forms. Figure 6 is a cross-sectional view of a display device according to another embodiment of the present disclosure, and please refer to Figure 1B .

[0120] Compared to Figure 1B Example, Figure 6 The display device 1 of the embodiment further includes a viewing angle control panel 300. The viewing angle control panel 300 may be disposed on the display panel 100 in the normal direction (Z) of the substrate 10. In one embodiment, when a driving voltage is provided to the viewing angle control panel 300, the liquid crystal molecules in the viewing angle control panel 300 may rotate to achieve the effect of limiting the light output angle, so that the display device 1 forms an anti-peeping mode; and when no driving voltage is provided to the viewing angle control panel 300, the liquid crystal molecules in the viewing angle control panel 300 do not move, so the display device 1 may form a sharing mode, but is not limited thereto.

[0121] Furthermore, in one embodiment, the display device 1 may further include a touch unit 400. In one embodiment, the touch unit 400 may be disposed on the viewing angle control panel 300 in the normal direction (Z) of the substrate 10. The touch unit 400 may be, for example, a touch panel, which may be implemented by TOD (touch on display) or projected capacitive touch panel (sensor glass) technology, but is not limited thereto. In another embodiment, the touch unit 400 may be disposed in the viewing angle control panel 300 or the display panel 100, which may be implemented by TID (touch in display) technology, but is not limited thereto.

[0122] In one embodiment, the present disclosure may compare products at least by means of mechanical observation, such as using the presence or absence of components or the operational relationship between components as evidence of whether the product falls within the scope of protection of the present disclosure, but is not limited thereto. In one embodiment, the mechanical observation may be achieved, for example, by using an optical microscope or a scanning microscope, but is not limited thereto.

[0123] The details or features of the various embodiments of the present disclosure may be mixed and matched as desired as long as they do not violate the spirit of the invention or conflict with each other.

[0124] The display device 1 and the backlight device 200 of the present disclosure can be understood. Thus, the display device 1 of the present disclosure can provide a high contrast effect. Alternatively, the light emitted by the backlight device 200 can be concentrated toward the front viewing angle, and the privacy requirement can be met without the need to attach or set an anti-peep film, or the yield of the backlight module can be higher or / and the cost can be lowered, or the side view light intensity can be reduced. Alternatively, the display device 1 of the present disclosure has high light package stability.

[0125] The above embodiments are merely examples for the convenience of explanation. The scope of rights claimed by the present disclosure should be based on the claims, rather than being limited to the above embodiments.

[0126] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A backlight device, characterized in that: Include: substrate; A light emitting element, disposed on the substrate, for providing a light source; A first optical film, disposed on the substrate, comprising a first prism component extending along a first direction; A second optical film, disposed on the first optical film, comprising a second prism assembly extending along a second direction; as well as A third optical film, disposed on the second optical film, comprising a third prism assembly extending along a third direction; The included angle between the first direction and the second direction is between 30 degrees and 150 degrees, and the second direction is parallel to the third direction.

2. The backlight device according to claim 1, characterized in that: In the normal direction of the substrate, the first prism component and the second prism component face the same direction, the third prism component and the second prism component face opposite directions, and the first prism component faces the substrate.

3. The backlight device according to claim 1, characterized in that: The invention also comprises a light-guiding element, which is arranged adjacent to the light-emitting element.

4. The backlight device according to claim 1, characterized in that: The first prism component has a first prism angle, the second prism component has a second prism angle, and the third prism component has a third prism angle, wherein the first prism angle is between 50 degrees and 90 degrees, and the second prism angle or the third prism angle is between 50 degrees and 120 degrees.

5. The backlight device according to claim 1, characterized in that: The first optical film, the second optical film and the third optical film are in contact with each other.

6. The backlight device according to claim 1, characterized in that: The refractive index of the first optical film, the second optical film or the third optical film is between 1.5 and 1.

7.

7. The backlight device according to claim 1, characterized in that: The first prism assembly has a plurality of first strip-shaped assemblies, and a first spacing is provided between two adjacent ones of the plurality of first strip-shaped assemblies. The second prism assembly has a plurality of second strip-shaped assemblies, and a second spacing is provided between two adjacent ones of the plurality of second strip-shaped assemblies. The third prism assembly has a plurality of third strip-shaped assemblies, and a third spacing is provided between two adjacent ones of the plurality of third strip-shaped assemblies, wherein the second spacing is greater than the third spacing, and the third spacing is greater than the first spacing.

8. A display device, characterized in that: Include: A backlight device, comprising: substrate; A light emitting element, disposed on the substrate, for providing a light source; A first optical film, disposed on the substrate, comprising a first prism component extending along a first direction; A second optical film, disposed on the first optical film, comprising a second prism assembly extending along a second direction; as well as A third optical film, disposed on the second optical film, comprising a third prism assembly extending along a third direction, wherein an angle between the first direction and the second direction is between 30 degrees and 150 degrees, and the second direction is parallel to the third direction; as well as The display panel is arranged on the backlight device.

9. The display device according to claim 8, characterized in that: It also includes a viewing angle control panel, which is arranged on the display panel.

10. The display device according to claim 9, characterized in that: It also includes a touch unit, which is arranged on the viewing angle control panel.

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