Display device and light guide plate

Abstract

The present disclosure provides a display device and a light guide plate. The display device includes a light guide plate. The light guide plate includes a substrate, a plurality of first eccentric microstructures, and a plurality of second eccentric microstructures. The light guide plate has a first region and a second region located at at least one side of the first region. The first eccentric microstructures are disposed on the substrate and located relative to the first region. The first eccentric microstructures have a first eccentric direction. The second eccentric microstructures are disposed on the substrate and located relative to the second region. The second eccentric microstructures have a second eccentric direction. An angle between the first eccentric direction and the second eccentric direction is less than 90 degrees. The light guide plate of the present disclosure includes eccentric microstructures having different eccentric directions, thereby adjusting the light-emitting viewing angle range by using the eccentric microstructures having different eccentric directions, thereby providing a display device capable of operating in a privacy mode.

Description

Technical Field

[0001] The subject matter of this case concerns a display device, and more particularly a display device having a light guide plate. Background Technology

[0002] Display devices are now widely used in various electronic products. However, with increasing demands for personal privacy, such as when users are processing personal data or confidential documents in public places, an optical adjustment film, also known as a privacy screen, is often attached to the display surface of the device in a fixed (e.g., adhesive) or detachable manner to prevent others from peeping. However, a fixed method reduces flexibility and cannot be freely adapted to sharing and privacy needs; while a detachable method requires additional structural components, leading to problems such as mechanical interference, limitations in achieving a thinner profile, and aesthetic compromises. Therefore, providing a display device with both wide-angle and privacy modes is a worthy area of ​​research and development. Summary of the Invention

[0003] This disclosure document describes a backlight assembly design that provides different viewing angles and further reduces the surface area of ​​the light source to avoid taking up too much space in the display device.

[0004] This disclosure provides a display device. The display device includes a light guide plate. The light guide plate includes a substrate, a plurality of first eccentric microstructures, and a plurality of second eccentric microstructures. The light guide plate has a first region and a second region located on at least one side of the first region. The first eccentric microstructures are disposed on the substrate and located opposite to each other in the first region, and the first eccentric microstructures have a first eccentric direction. The second eccentric microstructures are disposed on the substrate and located opposite to each other in the second region, and the second eccentric microstructures have a second eccentric direction, and the angle between the first eccentric direction and the second eccentric direction is less than 90 degrees.

[0005] In some embodiments, the display device further includes a first light source and a second light source. The first light source generates a first light beam and directs it to the first eccentric microstructures, causing the first eccentric microstructures to reflect the first light beam to generate a first reflected light beam having a first emission angle range. The second light source generates a second light beam and directs it to the second eccentric microstructures, causing the second eccentric microstructures to reflect the second light beam to generate a second reflected light beam having a second emission angle range. The first light source and the second light source are disposed on the same side of the light guide plate.

[0006] In some embodiments, the first eccentric direction is the direction opposite to one optical axis of the first light source.

[0007] In some embodiments, the first light emission angle range is different from the second light emission angle range.

[0008] In some embodiments, in a first mode, a first light source is used to generate a light beam having a first brightness, and a second light source is used to generate a light beam having the first brightness. In a second mode, the first light source is used to generate a light beam having the first brightness, and the second light source is used to generate a light beam having a second brightness, the value of which is less than the value of which is the first brightness.

[0009] In some embodiments, the light guide plate further includes a plurality of third eccentric microstructures and a third light source. The plurality of third eccentric microstructures are disposed on a substrate and located relative to each other in a third region of the light guide plate, and these third eccentric microstructures have a third eccentric direction. The first eccentric direction, the second eccentric direction, and the third eccentric direction are different from each other. The third light source is used to generate a third light beam to the third eccentric microstructures, causing the third eccentric microstructures to reflect the third light beam to generate a third reflected light beam having a third light emission angle range. The first light source, the second light source, and the third light source are disposed on the same side of the light guide plate.

[0010] In some embodiments, the first region is the central region of the light guide plate, and the second and third regions are respectively adjacent to the opposite sides of the central region.

[0011] In some embodiments, the first eccentric direction is the direction opposite to the optical axis of the first light source, and the second eccentric direction and the third eccentric direction are mirror-symmetrical with respect to the optical axis of the first light source.

[0012] In some embodiments, each of the first eccentric structures includes an arcuate surface and at least one vertical cutting plane. The arcuate surface has a cone point and a cutting edge located on the surface of the substrate, wherein the first eccentric direction is the direction from the center point of the cutting edge to the projection point of the cone point onto the surface. The at least one vertical cutting plane is parallel to the first eccentric direction.

[0013] This disclosure provides a light guide plate. The light guide plate includes a substrate, a plurality of first eccentric microstructures, and a plurality of second eccentric microstructures. The first eccentric microstructures are disposed on the substrate. The first eccentric microstructures have a first eccentric direction. The second eccentric microstructures are disposed on the substrate, the second eccentric microstructures have a second eccentric direction, and the second microstructures have a conical surface of an eccentric cone, wherein the first eccentric direction is different from the second eccentric direction, and the angle between the first eccentric direction and the second eccentric direction is less than 90 degrees.

[0014] In summary, the light guide plate disclosed in this document includes eccentric microstructures with different eccentric directions, thereby adjusting the light viewing angle range, and the included angle of the eccentric directions of the eccentric microstructures is less than 90 degrees, which can provide a light source on the same side of the light guide plate. Attached Figure Description

[0015] To make the above and other objects, features, advantages and embodiments of this disclosure more apparent and understandable, the accompanying drawings are described below:

[0016] Figure 1 This is a schematic diagram of a display device according to an embodiment of the present disclosure;

[0017] Figure 2 This is a schematic diagram of a light guide plate and a light source according to an embodiment of the present disclosure;

[0018] Figure 3A as well as Figure 3B This is a perspective view of an eccentric microstructure according to an embodiment of the present disclosure;

[0019] Figure 4A This disclosure is an embodiment of the present invention. Figure 2 A schematic diagram of the eccentric microstructure in the block of the light guide plate;

[0020] Figure 4B This disclosure is an embodiment of the present invention. Figure 4A A cross-sectional view of the light guide plate block along the dashed lines 41-42;

[0021] Figure 4C This disclosure is an embodiment of the present invention. Figure 4A A cross-sectional view of the light guide plate block along the dashed lines 43-44;

[0022] Figure 5 This is a schematic diagram of the light path of an eccentric microstructure according to an embodiment of the present disclosure;

[0023] Figure 6 This is a perspective view of an eccentric microstructure according to another embodiment of the present invention;

[0024] Figure 7A This disclosure is an embodiment of the present invention. Figure 2 A schematic diagram of the eccentric microstructure in the block of the light guide plate;

[0025] Figure 7B This disclosure is an embodiment of the present invention. Figure 7A A cross-sectional view of the light guide plate block along the dashed lines 71-72;

[0026] Figure 7C This disclosure is an embodiment of the present invention. Figure 7A A cross-sectional view of the light guide plate block along the dashed lines 73-74;

[0027] Figure 8A This disclosure is an embodiment of the present invention. Figure 2 A schematic diagram of the eccentric microstructure of the light guide plate in the block;

[0028] Figure 8B This disclosure is an embodiment of the present invention. Figure 8A A cross-sectional view of the light guide plate block along the dashed lines 81-82;

[0029] Figure 8C This disclosure is an embodiment of the present invention. Figure 8A A cross-sectional view of the light guide plate block along the dashed lines 83-84;

[0030] Figure 9 This disclosure is an embodiment of the present invention. Figure 2 Schematic diagram of an eccentric microstructure;

[0031] Figure 10 This is a schematic diagram of a light guide plate according to another embodiment of the present disclosure.

[0032] [Symbol Explanation]

[0033] To make the above and other objects, features, advantages and embodiments of this disclosure more apparent and understandable, the accompanying symbols are explained as follows:

[0034] 100: Display device

[0035] 110, 112, 114, 116: Light source

[0036] 112a~112d, 114a~114b, 116a~116b: Light-emitting elements

[0037] 120: Light guide plate

[0038] 121,221: Substrate

[0039] 122, 124, 126, 122a~122e, 124a~124d, 126a~126d: Eccentric microstructures

[0040] 130: Reflective layer

[0041] 140: Touch panel

[0042] 150: LCD display module

[0043] 160: Optical material layer

[0044] 170: Outer Accessories

[0045] 41-42, 43-44, 71-72, 73-74, 81-82, 83-84: Dashed lines

[0046] Ac: Central Area

[0047] Ap1, Ap2: Surrounding area

[0048] Acp1, Acp2: Regions

[0049] Dxp, Dyp, Dxn, Dyn, Dz: Direction

[0050] De1, De2, De3: Eccentric direction

[0051] Ot, Ot1, Ot2, Ot3: Cone points

[0052] E11~E14, E20~E22: Cutting edge

[0053] SUR1, SUR2: Perpendicular cutting plane

[0054] SURA, SURB: Curved surface

[0055] R1: Reference circle

[0056] Oe1~Oe3: Projection points

[0057] Os1~Os3: points

[0058] dr: radius

[0059] L11, L12: Light rays

[0060] RL11, RL12: Reflected light

[0061] RA11: Refracted light

[0062] S1~S3: Blocks Detailed Implementation

[0063] The following detailed description, in conjunction with the accompanying drawings, provides examples to better illustrate the subject matter. However, the provided examples are not intended to limit the scope of this invention, and the description of structural operations is not intended to limit the order of their execution. Any structure resulting from the recombination of elements, producing a device with equivalent functionality, falls within the scope of this invention. Furthermore, in accordance with industry standards and common practice, the accompanying drawings are for illustrative purposes only and are not drawn to their original dimensions. In reality, the dimensions of various features may be arbitrarily increased or decreased for ease of explanation. In the following description, the same elements will be labeled with the same symbols for ease of understanding.

[0064] The indexes 1 to n in the component and signal numbers used in this specification and drawings are for convenience of referring to individual components and signals, and are not intended to limit the number of the aforementioned components and signals to a specific number. In this specification and drawings, if a component or signal number is used without specifying its index, it means that the component or signal number refers to any unspecified component or signal within the corresponding component or signal group.

[0065] Furthermore, the terms "comprising," "including," "having," "containing," etc., used in this document are all open-ended terms, meaning "including but not limited to." Additionally, the term "and / or" as used in this document includes any one or more of the related listed items and all combinations thereof.

[0066] In this document, when an element is referred to as a “connection” or “coupled,” it may mean an “electrical connection” or “electrical coupling.” “Connection” or “coupled” can also be used to indicate the operation or interaction between two or more elements. Furthermore, although terms such as “first,” “second,” etc., are used in this document to describe different elements, these terms are only used to distinguish elements or operations described using the same technical terminology.

[0067] Please see Figure 1 , Figure 1 This is a schematic diagram of a display device 100 according to an embodiment of the present disclosure. The display device 100 includes a liquid crystal display module 150, a light guide plate 120, a light source 110, and a reflective layer 130. In some embodiments, the display device 100 may have a touch panel 140, an optical material layer 160, and an outer accessory 170, wherein the touch panel 140 may be disposed, for example, on the side of the liquid crystal display module 150 relatively close to the user (e.g., Figure 1 (shown on the upper side); the optical material layer 160 is disposed between the liquid crystal display module 150 and the light guide plate 120, and can be used, for example, to increase brightness and uniformity; the outer accessory 170 can be, for example, a housing of the display device 100, used to assemble and house the various components of the display device 100. In some embodiments, the display device 100 may not include the touch panel 140. Therefore, this invention is not limited thereto. In some embodiments, the light guide plate 120, the light source 110, and the reflective layer 130 can be configured as a backlight module, and the backlight module is disposed on one side of the liquid crystal display module 150 (e.g., the upper side); the optical material layer 160 is disposed between the liquid crystal display module 150 and the light guide plate 120, and can be used to increase brightness and uniformity; the outer accessory 170 can be, for example, a housing of the display device 100, used to assemble and house the various components of the display device 100. Figure 1 The lower side (as shown) is used as the backlight of the liquid crystal display module 150.

[0068] Please see Figure 2 , Figure 2 This is a schematic diagram of a light guide plate 120 and light sources 112, 114, and 116 according to an embodiment of this disclosure. Figure 2 As shown, the light guide plate 120 includes a substrate 121 and a plurality of eccentric microstructures 122, 124 and 126 disposed on the surface of the substrate 121.

[0069] In some embodiments, the diameters of the plurality of eccentric microstructures 122, 124, and 126 may be in the range of 3 to 7 micrometers. In other embodiments, the diameters of the plurality of eccentric microstructures 122, 124, and 126 may be in the range of 1 millimeter to 1 nanometer. In one embodiment, the light guide plate 120 is configured with a central region Ac and peripheral regions Ap1 and Ap2 respectively adjacent to opposite sides of the central region Ac. For example, the peripheral regions Ap1 and Ap2 are respectively disposed on opposite sides of the central region Ac in directions Dxn and Dxp, wherein the plurality of eccentric microstructures 122 are disposed in the central region Ac of the light guide plate 120, and the plurality of eccentric microstructures 124 and 126 are respectively disposed in the peripheral regions Ap1 and Ap2. Specifically, eccentric microstructures 122a to 122c are disposed in the central region Ac of the light guide plate 120; eccentric microstructures 124a to 124c are disposed in the peripheral region Ap1 of the light guide plate 120; and eccentric microstructures 126a to 126c are disposed in the peripheral region Ap2 of the light guide plate 120.

[0070] The structures of the multiple eccentric microstructures 122 disposed in the central region Ac differ from those of the multiple eccentric microstructures 124 and 126 disposed in the peripheral regions Ap1 and Ap2, respectively. Furthermore, the multiple eccentric microstructures 124 and 126 are mutually symmetrical in the horizontal direction (e.g., directions Dxn and Dxp). In other words, each of the multiple eccentric microstructures 124 and 126 can be mirror-symmetric with respect to the axial direction Dyn (Dyp).

[0071] Light sources 112, 114, and 116 are disposed on the same side / one side of the light guide plate 120. Thus, the light paths of light sources 112, 114, and 116 pass through the light guide plate 120 in the same direction (e.g., direction Dyp). In other words, the central region Ac and the peripheral regions Ap1 and AP2 of the light guide plate 120 receive light generated by light sources 112, 114, and 116 from the same direction (e.g., direction Dyn).

[0072] On one side of the light guide plate 120, the light source 112 is arranged along the edge of the central region Ac. The light source 112 is used to provide light to the central region Ac of the light guide plate 120, so that the multiple eccentric microstructures 122 in the central region Ac can convert the path of the light.

[0073] On one side of the light guide plate 120, a light source 114 is disposed along the edge of the peripheral region Ap1, and the light source 114 is used to provide light to the peripheral region Ap1 of the light guide plate 120 according to the display mode (e.g., wide-angle mode or privacy mode). Similarly, on one side of the light guide plate 120, a light source 116 is disposed along the edge of the peripheral region Ap2, and the light source 116 is used to provide light to the peripheral region Ap2 of the light guide plate 120 according to the display mode (e.g., wide-angle mode or privacy mode). In this way, the plurality of eccentric microstructures 124 and 126 in the peripheral regions Ap1 and Ap2 can convert the light path according to the light sources 114 and 116.

[0074] Light source 112 includes light-emitting elements 112a to 112d. Light source 114 includes light-emitting elements 114a to 114b. Light source 116 includes light-emitting elements 116a to 116b. In some embodiments, light-emitting elements 112a to 112d, 114a to 114, and 116a to 116b may be implemented by light-emitting diodes, sub-millimeter light-emitting diodes, or other light-emitting elements. Therefore, this application is not limited thereto.

[0075] Please see Figure 3A as well as Figure 3B . Figure 3A as well as Figure 3B This is a perspective view of an eccentric microstructure 122c according to an embodiment of the present disclosure. Figure 2 Each of the multiple eccentric microstructures 122 shown can be implemented by the eccentric microstructure 122c.

[0076] like Figure 3A as well as Figure 3B As shown, the eccentric microstructure 122c has a portion of an eccentric conical structure. That is, the eccentric microstructure 122c has an arcuate surface SURA. The arcuate surface SURA has a cone point Ot1 and a cutting edge E11 located on the surface of the substrate 121 (such as the bottom surface) of the light guide plate 120. The eccentric microstructure 122c also has at least one vertical cutting plane (e.g., vertical cutting planes SUR1 and SUR2) along a vertical direction (e.g., direction Dz). Furthermore, the vertical cutting planes SUR1 and SUR2 are parallel to the directions Dyp and Dyn. In other words, the vertical cutting planes SUR1 and SUR2 of the eccentric microstructure 122c are parallel to the path of light from the light sources 112, 114, and 116 to the light guide plate 120.

[0077] Please see Figure 4A This disclosure is an embodiment of the present invention. Figure 2 A schematic diagram of the eccentric microstructure 122c in block S1 of the light guide plate 120. (See diagram) Figure 4AAs shown, the cutting edges E11 and E12 of the eccentric microstructure 122c are designed based on the reference circle R1. To reduce the light emission angles along the directions Dxn and Dyn, the sum of the lengths of the cutting edges E11 and E12 of the eccentric microstructure 122c can be half the length of the reference circle R1. In this way, the light emission angles along the directions Dxp and Dxn of the eccentric microstructure 122c can be reduced, thus achieving a good effect in privacy mode.

[0078] Please see Figure 4A , Figure 4B as well as Figure 4C , Figure 4B This disclosure is an embodiment of the present invention. Figure 4A A cross-sectional view of block S1 of the light guide plate 120 along the dashed lines 41-42. Figure 4C This disclosure is an embodiment of the present invention. Figure 4A A cross-sectional view of block S1 of the light guide plate 120 along the dashed lines 43-44. (See attached image.) Figure 4B As shown, the eccentric microstructure 122c is, for example, embedded or recessed into the surface (such as the bottom surface) of the substrate 121, and is a hollow structure. In other embodiments, the eccentric microstructure 122c may be filled with other materials. Furthermore, the reflective layer 130 is disposed adjacent to the light guide plate 120.

[0079] The eccentric microstructure 122c has an eccentric direction De1, which is the direction extending from the center point Or1 of the cutting edges E11 to E14 at the bottom of the eccentric microstructure 122c (that is, the projection point of point Os1 on the arc surface SURA onto the horizontal plane, which is the center of the reference circle R1) to the cone point Ot1 (the projection point Oe1 on the horizontal plane). Furthermore, the eccentric direction De1 is parallel to the direction Dyn.

[0080] like Figure 4A as well as Figure 4C As shown, the eccentric microstructure 122c uses a portion of a reference circle R1 with radius dr as the bottom cutting edge of its conical structure, and the cone point Ot1 of the eccentric microstructure 122c is a cone point on the horizontal plane that deviates from the center point Or1 of the reference circle R1 along the eccentric direction De1. Furthermore, the eccentric direction De1 is opposite to the optical axis of the light source 112. Since the eccentric direction De1 is opposite to the light path of the light source 112, the eccentric microstructure 122c can provide a light path using direction Dz as the optical axis. How the eccentric microstructure 122c provides a light path using direction Dz as the optical axis will be explained in detail in subsequent embodiments.

[0081] Please see Figure 5 , Figure 5 This is a schematic diagram of the light path of an eccentric microstructure 122c according to an embodiment of this disclosure.

[0082] like Figure 5 As shown, light source 112 generates light rays L11 and L12. Ray L11 is incident on the eccentric microstructure 122c, generating reflected light RL11. The angle between reflected light RL11 and the vertical direction (e.g., direction Dz) is θ. y2 Furthermore, after light ray L11 is incident on the eccentric microstructure 122c, it is refracted by the eccentric microstructure 122c and reflected on the reflective layer 130, and then refracted out as refracted light RA11 from the eccentric microstructure 122c. The angle between the refracted light RA11 and the vertical direction (e.g., direction Dz) is θ. y1 Thus, the eccentric microstructure 122c can change the path of ray L11 along direction Dyp to direction Dz at angle θ. y1 to θ y2 Within the range.

[0083] On the other hand, after the light ray L12 is first reflected by the reflective layer 130, it is also reflected by the eccentric microstructure 122c, generating reflected light RL12. The outgoing direction of the reflected light RL12 is approximately the same as that of the direction Dz.

[0084] Therefore, the eccentric microstructure 122c can redirect the light rays L11 and L12 from the light source 112 to the positive viewing angle range (e.g., with an angle θ along the direction Dyp and direction Dyn centered on the direction Dz). y1 to θ y2 (within the range).

[0085] Furthermore, since the eccentric microstructure 122c has vertical cutting planes SUR1 and SUR2, its light emission angle along directions Dxp and Dxn with direction Dz as the axis is less than 45 degrees.

[0086] In some embodiments, the eccentric microstructure 122c has an angle θ a It can be within the range of 60 degrees to 120 degrees.

[0087] Please see Figure 6 . Figure 6 This is a perspective view of an eccentric microstructure 125 according to another embodiment of this disclosure. Figure 6 As shown, the eccentric microstructure 125 has a cone point Ot, an arc-shaped surface SURB, and a cutting edge E20. Figure 2 Each of the multiple eccentric microstructures 124 and 126 located in the surrounding regions Ap1 and Ap2 shown can be implemented by the eccentric microstructure 125.

[0088] Please see Figure 7A , Figure 7B as well as Figure 7C . Figure 7A This disclosure is an embodiment of the present invention. Figure 2A schematic diagram of the eccentric microstructure 124c in block S2 of the light guide plate 120. Figure 7B This disclosure is an embodiment of the present invention. Figure 7A A cross-sectional view of block S2 of light guide plate 120 along dashed lines 71-72. Figure 7C This disclosure is an embodiment of the present invention. Figure 7A A cross-sectional view of block S2 of light guide plate 120 along dashed lines 73-74. (See attached image.) Figure 7A As shown, dashed lines 71-72 extend along direction Ds2, and dashed lines 73-74 extend along direction De2.

[0089] like Figure 7B As shown, the eccentric microstructure 124c is, for example, embedded or recessed into the surface (e.g., the bottom surface) of the substrate 121, and is a hollow structure. In other embodiments, the eccentric microstructure 124c may be filled with other materials. Furthermore, the reflective layer 130 is disposed adjacent to the light guide plate 120. It should be noted that... Figure 2 Each of the multiple eccentric microstructures 124 in the structure can be implemented by the eccentric microstructure 124c.

[0090] The eccentric microstructure 124c has an eccentric direction De2, which is the direction extending from the center point Or2 of the cutting edge E21 at the bottom of the eccentric microstructure 124c (that is, the projection point of point Os2 on the arc surface SURB onto the horizontal plane) to the cone point Ot2 (the projection point Oe2 on the horizontal plane). Furthermore, the eccentric direction De2 is between the directions Dxn and Dyn, and the angle between the eccentric direction De2 and the eccentric direction De1 is less than 90 degrees.

[0091] like Figure 7A as well as Figure 7C As shown, the eccentric microstructure 124c uses the radius dr as the bottom cutting edge E21 of its eccentric conical structure, and the cone point Ot2 of the eccentric microstructure 124c is a cone point on the horizontal plane that is offset from the center point Or2 along the eccentric direction De2. Since the eccentric direction De2 has an angle with the light path of the light source 114, the eccentric microstructure 124c can use the direction Dz as the light output path, and improve the light output angle of the eccentric microstructure 124c along the direction Dxn with the direction Dz as the axis.

[0092] Please see Figure 8A , Figure 8B as well as Figure 8C . Figure 8A This disclosure is an embodiment of the present invention. Figure 2 A schematic diagram of the eccentric microstructure 126c in block S3 of the light guide plate 120. Figure 8B This disclosure is an embodiment of the present invention. Figure 8A A cross-sectional view of block S3 of light guide plate 120 along dashed lines 81-82. Figure 8CThis disclosure is an embodiment of the present invention. Figure 8A A cross-sectional view of block S3 of light guide plate 120 along dashed lines 83-84. (See attached image.) Figure 8A As shown, dashed lines 81-82 extend along direction Ds3, and dashed lines 83-84 extend along direction De3.

[0093] like Figure 8B As shown, the eccentric microstructure 126c is, for example, embedded or recessed into the surface (e.g., the bottom surface) of the substrate 121, and is a hollow structure. In other embodiments, the eccentric microstructure 126c may be filled with other materials. Furthermore, the reflective layer 130 is disposed adjacent to the light guide plate 120. It should be noted that... Figure 2 Each of the multiple eccentric microstructures 126 in the structure can be implemented by the eccentric microstructure 126c.

[0094] The eccentric microstructure 126c has an eccentric direction De3, which is the direction extending from the center point Or3 of the cutting edge E22 at the bottom of the eccentric microstructure 126c (that is, the projection point of point Os3 on the arc surface SURB onto the horizontal plane) to the cone point Ot3 (the projection point Oe3 on the horizontal plane). Furthermore, the eccentric direction De3 is between the directions Dyn and Dxp, and the angle between the eccentric direction De3 and the eccentric direction De1 is less than 90 degrees.

[0095] like Figure 8A as well as Figure 8C As shown, the eccentric microstructure 126c uses the radius dr as the bottom cutting edge E22 of its eccentric conical structure, and the cone point Ot3 of the eccentric microstructure 126c is a cone point on the horizontal plane that is offset from the center point Or3 along the eccentric direction De3. Since the eccentric direction De3 has an angle with the light path of the light source 116, the eccentric microstructure 126c can use the direction Dz as the light output path, and improve the light output angle of the eccentric microstructure 126c along the direction Dxp with the direction Dz as the axis.

[0096] Overall, from the above Figure 4A , Figure 7A and Figure 8A It can be seen that the eccentric direction De1 of the eccentric microstructure 122c is opposite to the optical axis of the first light source 122; while the eccentric directions De2 and De3 of the eccentric microstructure 124c and the eccentric direction De3 of the eccentric microstructure 126c are mirror-symmetrical with respect to the optical axis of the first light source 122.

[0097] Please refer to the following: Figure 2 as well as Figure 9 , Figure 9 This disclosure is an embodiment of the present invention. Figure 2 Schematic diagrams of eccentric microstructures 122c, 124c, and 126c light guides. Figure 9As shown, the eccentric microstructure 122c in block S1 will direct the light to the direction of the frontal view, the eccentric microstructure 124c in block S2 will direct the light to the direction of the left-side view, and the eccentric microstructure 126c in block S3 will direct the light to the direction of the right-side view.

[0098] Specifically, the light source 112 generates a light beam to a plurality of eccentric microstructures 122, causing the plurality of eccentric microstructures 122 to reflect the light beam to generate a reflected light beam having an output angle range (e.g., within a range of positive 45 degrees along the direction Dxp and the direction Dxn with the direction Dz as the optical axis).

[0099] The light source 114 generates a light beam to a plurality of eccentric microstructures 124, causing the plurality of eccentric microstructures 124 to reflect the light beam to generate a reflected light beam having an emission angle range (e.g., within a range of positive 45 degrees along the direction Dxn with the direction Dz as the axis).

[0100] Light source 116 generates a light beam to a plurality of eccentric microstructures 126, causing the plurality of eccentric microstructures 126 to reflect the light beam to generate a reflected light beam having an emission angle range (e.g., within a range of ±45 degrees along direction Dxp with direction Dz as the axis). In some embodiments, the light angle ranges of light source 116 and light source 114 may be different from each other.

[0101] Thus, in wide-viewing-angle mode, the brightness of light sources 112, 114, and 116 can be adjusted to be consistent or maximum, so that the peripheral areas Ap1 and Ap2 of the light guide plate 120 provide light sources for the left and right views respectively, while the central area Ac of the light guide plate 120 provides light sources for the frontal view. On the other hand, in privacy mode, the brightness of light source 112 can be maintained, while the brightness of light sources 114 and 116 can be reduced or turned off directly, so that the peripheral areas Ap1 and Ap2 of the light guide plate 120 reduce or even stop providing light sources for the left and right views, while the central area Ac of the light guide plate 120 maintains the provision of light sources for the frontal view.

[0102] For example, in wide-viewing-angle mode, light source 112 generates a beam with a first brightness (e.g., 100% brightness), and light sources 114 and 116 also generate beams with a first brightness (e.g., 100% brightness). In privacy mode, light source 112 generates a beam with a first brightness (e.g., 100% brightness), and light sources 114 and 116 generate beams with a second brightness (e.g., 50% brightness). In other words, in privacy mode, by adjusting the brightness values ​​of light sources 114 and 116 to be lower than the brightness value of light source 112, the light emission range of the side viewing angle can be reduced, thereby achieving a privacy effect.

[0103] Please see Figure 10 , Figure 10This is a schematic diagram of a light guide plate 220 according to another embodiment of this disclosure. Figure 10 As shown, the light guide plate 220 includes a substrate 221 and multiple eccentric microstructures 122, 124 and 126.

[0104] and Figure 2 Compared to the light guide plate 120 in the embodiment, Figure 10 The difference of the light guide plate 220 is that the central region Ac of the substrate 221 of the light guide plate 220 and the surrounding regions Ap1 and Ap2 can be further configured with mixed regions, such as regions Acp1 and Acp2 of the light guide plate 120.

[0105] For example, eccentric microstructures 122d and 124d are disposed in region Acp1 of the light guide plate 120, and eccentric microstructures 122e and 126d are disposed in region Acp2 of the light guide plate 120. Figure 10 The functions and structures of the multiple eccentric microstructures 122, 124, and 126 are respectively similar to Figure 2 The functions and structures of the multiple eccentric microstructures 122, 124, and 126 are not elaborated here. The design of regions Acp1 and Acp2 creates a transition between the central region Ac and the surrounding regions Ap1 and Ap2, resulting in a smoother and more harmonious overall visual effect.

[0106] In summary, the multiple eccentric microstructures 124 of the light guide plate 120 in this invention direct light to the left of the normal viewing angle, and the multiple eccentric microstructures 126 direct light to the right of the normal viewing angle. Furthermore, the multiple eccentric microstructures 122 reduce the light emission range on the left and right sides of the normal viewing angle, thereby providing a normal viewing angle mode or a privacy mode based on the brightness of the light sources 112, 114, and 116, respectively. Moreover, the angle between the eccentric direction De1 of the multiple eccentric microstructures 122 and the eccentric directions De2 and De3 of the multiple eccentric microstructures 124 and 126 is less than 90 degrees, allowing the light sources 112, 114, and 116 to be positioned on the same side of the light guide plate 120, thereby reducing the size of the backlight module.

[0107] Although the embodiments have been disclosed above, this case is not intended to limit the scope of the invention. Anyone skilled in the art may make various modifications and alterations without departing from the spirit and scope of the invention. Therefore, the scope of protection of this case shall be determined by the scope defined in the appended claims.

Claims

1. A display device, characterized in that, Include: A light guide plate having a first region and a second region located on at least one side of the first region, the light guide plate comprising: One substrate; A plurality of first eccentric microstructures are disposed on the substrate and located relative to each other in the first region. Each of the first eccentric microstructures has a first eccentric orientation and includes: An arcuate surface having a cone point and a cutting edge located on a surface of the substrate, wherein the first eccentric direction is the direction from a center point of the cutting edge to a projection point of the cone point onto the surface; and At least one perpendicular cutting plane, wherein the at least one perpendicular cutting plane is parallel to the first eccentric direction; and Multiple second eccentric microstructures are disposed on the substrate and located opposite each other in the second region. The second eccentric microstructures have a second eccentric direction, wherein the first eccentric direction is different from the second eccentric direction, and wherein the angle between the first eccentric direction and the second eccentric direction is less than 90 degrees.

2. The display device according to claim 1, characterized in that, Also includes: A first light source is configured to generate a first light beam to the first eccentric microstructures, causing the first eccentric microstructures to reflect the first light beam to generate a first reflected light beam having a first emission angle range; and A second light source is used to generate a second light beam to the second eccentric microstructures, causing the second eccentric microstructures to reflect the second light beam to generate a second reflected light beam having a second emission angle range, wherein... The first light source and the second light source are located on the same side of the light guide plate.

3. The display device according to claim 2, characterized in that, The first eccentric direction is a direction opposite to one of the optical axes of the first light source.

4. The display device according to claim 2, characterized in that, The first light emission angle range is different from the second light emission angle range.

5. The display device according to claim 2, characterized in that, in: In a first mode, the first light source is used to generate a light beam having a first brightness, and the second light source is used to generate a light beam having the first brightness. as well as In a second mode, the first light source is used to generate a light beam having the first brightness, and the second light source is used to generate a light beam having a second brightness, wherein the value of the second brightness is less than the value of the first brightness.

6. The display device according to claim 2, characterized in that, The light guide plate also includes: Multiple third eccentric microstructures are disposed on the substrate and located relative to each other in a third region of the light guide plate. The third eccentric microstructures have a third eccentric direction, wherein the first eccentric direction, the second eccentric direction and the third eccentric direction are different from each other. as well as A third light source is used to generate a third light beam to the third eccentric microstructures, causing the third eccentric microstructures to reflect the third light beam to generate a third reflected light beam having a third emission angle range, wherein... The first light source, the second light source, and the third light source are located on the same side of the light guide plate.

7. The display device according to claim 6, characterized in that, The first region is a central region of the light guide plate, and the second region and the third region are respectively adjacent to the opposite sides of the central region.

8. The display device according to claim 7, characterized in that, The first eccentric direction is a direction opposite to the optical axis of the first light source, and the second eccentric direction and the third eccentric direction are mirror-symmetrical with respect to the optical axis of the first light source.

9. A light guide plate, characterized in that, Include: One substrate; A plurality of first eccentric microstructures are disposed on the substrate, the first eccentric microstructures having a first eccentric orientation, wherein each of the first eccentric structures comprises: An arcuate surface having a cone point and a cutting edge located on a surface of the substrate, wherein the first eccentric direction is the direction from a center point of the cutting edge to a projection point of the cone point onto the surface; and At least one vertical cutting plane, wherein the at least one vertical cutting plane is parallel to the first eccentric direction; as well as Multiple second eccentric microstructures are disposed on the substrate, the second eccentric microstructures having a second eccentric direction, wherein the angle between the first eccentric direction and the second eccentric direction is less than 90 degrees.

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