Backlight module and display device

Abstract

This application discloses a backlight module and a display device. The backlight module includes: a lamp board; multiple light sources arranged in an array on the lamp board; a first lampshade and a second lampshade respectively disposed on both sides of the light sources; and a first gear and a second gear connected to the first and second lampshades and disposed on the side of the lamp board away from the light sources. The first gear and the second gear abut against each other, so that the first gear drives the second gear to rotate in the opposite direction to the first gear, thereby driving the first lampshade and the second lampshade to rotate in a direction away from or towards each other, so as to achieve viewing angle switching. With the above structure, switching between wide and narrow viewing angles at any angle can be achieved.

Description

Technical Field

[0001] This invention relates to the field of displays, and in particular to backlight modules and display devices. Background Technology

[0002] LED (Light Emitting Diode) displays have backlight modules that include multiple light sources with independently adjustable brightness, resulting in superior display performance and widespread use in display terminals such as mobile phones and tablets.

[0003] In modern society, we increasingly rely on mobile devices and electronic devices for work and life, often using them in public places or shared spaces. When people use these devices in public to read documents, reply to messages, log in to accounts, etc., the content on the screen may contain sensitive information, such as personal privacy, trade secrets, and bank account information. If this information is spied on by onlookers, it can lead to privacy leaks and security risks. Therefore, it is essential to provide users with a safer and more private environment.

[0004] Therefore, it is essential to invent a novel module structure design with controllable viewing angle to protect user privacy and information security. Summary of the Invention

[0005] The main technical problem addressed by this application is to provide a backlight module and display device that enables switching between wide and narrow viewing angles at any angle, thereby improving the privacy protection of the display panel.

[0006] To address the aforementioned issues, this application provides a backlight module comprising: a lamp panel; multiple light sources arranged in an array on the lamp panel; a first lampshade and a second lampshade respectively disposed on the left and right sides of the light sources; and a first gear and a second gear connected to the first lampshade and the second lampshade and disposed on the side of the lamp panel away from the light sources. The first gear and the second gear abut against each other, so that the first gear drives the second gear to rotate in the opposite direction to the first gear, thereby driving the first lampshade and the second lampshade to rotate in a direction away from or close to each other, thereby achieving wide and narrow viewing angle switching.

[0007] The first lampshade and the second lampshade have the same shape, each including a first plate and a second plate arranged perpendicularly to each other. The second plate has a serrated opening at the end away from the first plate. The serrated opening on the second plate of the first lampshade corresponds to the serrated opening on the second plate of the second lampshade, so as to retain the opening when the first lampshade and the second lampshade abut each other, thereby allowing light to pass through.

[0008] Wherein, the first plate and the second plate form an L-shaped lampshade, one end of the second plate is connected to the end of the first plate away from the lamp panel; wherein, the length of the second plate extending along the end perpendicular to the first plate is half the distance between the first plate of the first lampshade and the first plate of the second lampshade.

[0009] The spacing between two adjacent rows or columns of light sources is greater than twice the length of the first plate.

[0010] The first gear has a third gear protruding from the surface of the lamp panel and connected to the first lampshade. The first gear drives the third gear to rotate, thereby driving the first lampshade to rotate. The second gear has a fourth gear protruding from the surface of the lamp panel and connected to the second lampshade. The second gear drives the fourth gear to rotate, thereby driving the second lampshade to rotate.

[0011] The first gear and the second gear have the same radius, and the third gear and the fourth gear have the same radius.

[0012] Among them, multiple light sources in the same row or column form a group. The light sources in the same group share the first lampshade and the second lampshade, as well as the first gear and the second gear. The first gears of different groups are connected to each other so that the first lampshade and the second lampshade of different groups rotate synchronously to achieve synchronous switching of viewing angle.

[0013] The first gears of different groups are interconnected by a gear belt so that rotating one of the first gears drives the first gears of the other groups to rotate synchronously.

[0014] At least half of the third gear and the fourth gear protrude from the lamp plate.

[0015] This application also provides a display device, which includes a backlight module as described in any of the above embodiments, a display screen disposed on one side of the light-emitting surface of the backlight module, and an optical film disposed between the backlight module and the display screen.

[0016] The beneficial effects of this application are: by setting a first lampshade and a second lampshade on both sides of the light source, and a first gear and a second gear of the same size connected to the lampshade, by controlling the rotation of the first gear, the second gear that abuts against the first gear is controlled to rotate in the opposite direction to the first gear, thereby controlling the first lampshade and the second lampshade to rotate in a direction away from or close to each other, thereby realizing the switching of the viewing angle of the light source. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the backlight module of this application;

[0019] Figure 2 This is a structural schematic diagram of a specific embodiment of the lampshade of this application;

[0020] Figure 3 This is a top view of an embodiment of the backlight module of this application;

[0021] Figure 4 This is a schematic diagram of the structure of the first specific embodiment of the backlight module of this application;

[0022] Figure 5 This is a schematic diagram of the narrow-angle light emission of the backlight module in this application;

[0023] Figure 6 This is a schematic diagram of the wide-viewing-angle light emission of the backlight module in this application;

[0024] Figure 7 This is a schematic diagram of the structure of an embodiment of the display device of this application.

[0025] 1. Lamp board; 11. Light source; 121. First lampshade; 122. Second lampshade; 131. First gear; 132. Second gear; 1211. First plate; 1212. Second plate; 133. Third gear; 134. Fourth gear; 130. Gear belt; 1300. Motor; 100. Backlight module; 200. Display screen; 300. Optical film; 400. Housing. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless otherwise clearly indicated above. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0028] It should be understood that the term "and / or" used herein is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0029] It should be understood that the terms "comprising," "including," or any other variations used herein are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in every place in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] This application provides a backlight module; please refer to the details. Figure 1 , Figure 1 This is a schematic diagram of the structure of an embodiment of the backlight module of this application. Figure 1 As shown, the backlight module includes: a lamp panel 1, a light source 11, a first lamp cover 121 and a second lamp cover 122, as well as a first gear 131 and a second gear 132.

[0033] The light source 11 is disposed on the surface of the lamp board 1, including multiple sources arranged in an array. The light source 11 is a minLED (sub-millimeter light-emitting diode), or it can be a Micro LED (micro light-emitting diode), which is not limited here.

[0034] The first lampshade 121 and the second lampshade 122 are respectively disposed on the left and right sides of the light source 11 to cover the light source 11.

[0035] The first gear 131 and the second gear 132 are disposed on the side of the lamp plate 1 away from the light source 11, and are respectively connected to the first lamp cover 121 and the second lamp cover 122.

[0036] The first gear 131 and the second gear 132 abut against each other, so that one gear (such as the first gear 131) rotates, driving the other gear (the second gear 132) to rotate in the opposite direction, thereby driving the first lampshade 121 and the second lampshade 122 to rotate in directions away from or towards each other. One of the first gear 131 and the second gear 132 is a driving gear, and the other is a driven gear.

[0037] Specifically, the first gear 131 is the driving gear, and the second gear 132 is the driven gear. The first gear 131 is located to the left of the second gear 132. When the first gear 131 rotates clockwise, it drives the second gear 132 to rotate counterclockwise. The first gear 131 drives the first lampshade 121 to rotate closer to the second lampshade 122, and the second gear 132, rotating counterclockwise, drives the second lampshade 122 to rotate closer to the left side of the first lampshade 121, until the first lampshade 121 and the second lampshade 122 come into contact. When the first lampshade 121 and the second lampshade 122 come into contact, the light from the light source 11 is partially blocked, resulting in a narrow viewing angle. When the first gear 131 rotates counterclockwise, it drives the second gear 132 to rotate clockwise. The first gear 131 drives the first lampshade 121 to rotate away from the second lampshade 122, and the second gear 132 drives the second lampshade 122 to rotate away from the first lampshade 121, until the first lampshade 121 and the second lampshade 122 respectively come into contact with the surface of the lamp panel 1. The obstruction on the surface of the light source 11 gradually decreases, so that the light changes from a narrow viewing angle to a wide viewing angle.

[0038] In this embodiment, by rotating the first gear 131 or the second gear 132, another gear is driven to rotate in the opposite direction, thereby causing the first lampshade 121 and the second lampshade 122 above the light source 11 to rotate in a direction away from or close to each other, thereby achieving the switching between wide and narrow viewing angles.

[0039] Specifically, the first lampshade 121 and the second lampshade 122 have the same shape; please refer to [link / reference]. Figure 2 , Figure 2 This is a structural schematic diagram of a specific embodiment of the lampshade of this application. Figure 2As shown, both the first lampshade 121 and the second lampshade 122 include a first plate 1211 and a second plate 1212 arranged perpendicularly to each other. The second plate 1212 has a serrated opening at its end away from the first plate 1211. The serrated opening on the second plate 1212 of the first lampshade 121 corresponds to the serrated opening on the second plate 1212 of the second lampshade 122, so that a rectangular opening formed by the two serrated openings is maintained when the second plates 1212 of the first lampshade 121 and the second plate 1212 of the second lampshade 122 abut together. Specifically, light sources 11 in the same row or column share one first lampshade 121 and one second lampshade 122. The opening corresponding to the light source 11 is not limited here. The first plate 1211 is arranged perpendicular to the surface of the lamp panel 1, and the second plate 1212 is arranged parallel to the surface of the lamp panel 1. The second plate 1212 is disposed at the end of the first plate 1211 away from the surface of the lamp plate 1 and extends toward the light source 11 to partially block the light source 11 when parallel to the lamp plate 1.

[0040] In one specific embodiment, one end of the second plate 1212 is connected to one end of the first plate 1211 to form an L-shaped lampshade (including a first lampshade and a second lampshade). In other embodiments, the second plate 1212 and the first plate 1211 may also form a T-shaped lampshade, which is not limited here. In this specific embodiment, the second plate 1212 extends perpendicularly to the first plate 1211 towards the light source 11, and one end of the second plate 1212 is connected to one end of the first plate 1211 to form an L-shaped lampshade. The extension length L of the second plate 1212 perpendicular to the first plate 1211 is half the distance between the first plate 1211 of the first lampshade 121 and the first plate 1211 of the second lampshade 122, so that when the first lampshade 121 and the second lampshade 122 abut, the first plate 1211 is perpendicular to the lamp panel 1, and the second plate 1212 is parallel to the lamp panel 1. In other embodiments, the length of the second plate 1212 can be slightly less than or slightly greater than half the distance between the two first plates 1211, but the difference cannot be too large, otherwise the second plates 1212 will not be able to abut, affecting the light-emitting angle of the light source 11. More specifically, the length of the first plate 1211 is greater than the height of the light source 11, but the closer the length of the first plate 1211 is to the height of the light source 11, the smaller the distance between two adjacent rows or columns of light sources 11, which is beneficial for the production of high-resolution display panels. In this embodiment, the first plate 1211 limits the maximum rotation angle between the first lampshade 121 and the second lampshade 122.

[0041] This application also provides a top view structural diagram of a backlight module. Please refer to [link / reference]. Figure 3 , Figure 3 This is a top view structural diagram of an embodiment of the backlight module of this application. Figure 3 This is a top view of the first lampshade 121 and the second lampshade 122 when they are in contact. Figure 3 As shown, multiple light sources 11 in the same column share a first lampshade 121 and a second lampshade 122. The second plate of the first lampshade 121 and the second plate of the second lampshade 122 are arranged opposite to each other to form a rectangular opening. The light source 11 is arranged directly opposite the rectangular opening. In other words, the rectangular opening and the light source 11 coincide in the top view projection.

[0042] In one specific embodiment, the backlight module further includes a third gear and a fourth gear; please refer to further details. Figure 4 , Figure 4 This is a structural schematic diagram of a first specific embodiment of the backlight module of this application. Figure 4 As shown, in one specific embodiment, a third gear 133 protrudes from the surface of the lamp panel 1 and is connected to the first lampshade 121 on the first gear 131. The third gear 133 abuts against the first gear 131, so that the first gear 131 drives the third gear 133 to rotate, thereby causing the first lampshade 121 fixed on the third gear 133 to rotate away from or towards the second lampshade 122. A fourth gear 134 protrudes from the surface of the lamp panel 1 and is fixedly connected to the second lampshade 122 on the second gear 132. The fourth gear 134 abuts against the second gear 132, so that the fourth gear 134 rotates as the second gear 132 rotates, thereby causing the second lampshade 122 to rotate towards or away from the first lampshade 121. In other embodiments, the first gear 131 and the second gear 132 may protrude from the surface of the lamp plate 1, and the protruding parts may be fixedly connected to the first lampshade 121 and the second lampshade 122 respectively, directly driving the first lampshade 121 and the second lampshade 122 to rotate in a direction that moves closer to or further away from each other.

[0043] In this embodiment, the first gear 131 and the second gear 132 have the same radius, and the third gear 133 and the fourth gear 134 have the same radius, so that the first gear 131 and the second gear 132 rotate at the same speed, and the third gear 133 and the fourth gear 134 rotate at the same speed, thereby causing the first lampshade 121 and the second lampshade 122 to move at the same speed in a direction that moves away from or towards each other. More specifically, the first gear 131 has the same number of gears as the second gear 132, and the third gear 133 and the fourth gear 134 have the same number of gears. The number of gears in the first gear 131 and the third gear 133 may be the same or different, and this is not limited here.

[0044] In this embodiment, multiple light sources 11 in the same row or column form a group, and the light sources 11 in the same group share the first lampshade 121 and the second lampshade 122, as well as the first gear 131 and the second gear 132. Specifically, they also share the third gear 133 and the fourth gear 134.

[0045] More specifically, the first gears 131 of different groups are interconnected, so that one of the first gears 131 drives the first gears 131 of other groups to rotate synchronously, thereby driving the first lampshade 121 and the second lampshade 122 of different groups to rotate synchronously, thereby enabling the synchronous switching of the wide and narrow viewing angles of the light source 11 of the entire backlight module.

[0046] In this specific embodiment, the first gears 131 of different groups are interconnected via a gear belt 130. Specifically, the leftmost first gear 131 is connected to the rightmost first gear 131 and contacts the multiple first gears 131 in the middle. The friction of the gear belt 130 is greater than the rotational force of the gears. In another specific embodiment, the first gears 131 of different groups abut against the second gears 132, thereby connecting one group of first gears 131 to another group of first gears 131 via the second gears 132. This, in turn, connects multiple second gears 132 to multiple other groups of first gears 131 in sequence. One group of first gears 131 drives the second group of gears 132 to rotate, which in turn drives the first group of first gears 131 to rotate, and so on, ensuring that all gears in the entire backlight module rotate synchronously. In other embodiments, the first gears 131 of different groups can also be interconnected in other ways, which are not limited here.

[0047] In this embodiment, specifically, the backlight module also includes a motor 1300, such as... Figure 3 As shown, the motor 1300 is connected to one set (i.e., one column) of first gears 131 to drive the first gears 131 of one set to rotate, thereby causing the first gears 131 of other sets to rotate synchronously, and in turn causing the second gears 132 of different sets to rotate synchronously in the opposite direction. With the above structure, only one motor is needed to achieve the viewing angle switching of the backlight module.

[0048] More specifically, at least half of the third gear 133 and the fourth gear 134 protrude from the surface of the lamp panel 1 so that the first lampshade 121 and the second lampshade 122 can be fully opened when they rotate in a direction away from each other, thereby fully exposing the light source 11. Otherwise, the first lampshade 121 and the second lampshade 122 will not be able to rotate after rotating to a certain angle, resulting in them not being able to be fully opened. This is not limited here.

[0049] In this embodiment, the spacing between two adjacent rows or columns of light sources 11 is greater than twice the length of the first plate 1211, so that the first lampshade 121 and the second lampshade 122 can be fully opened, and the first plate 1211 of the first lampshade 121 and the first plate 1211 of the second lampshade 122 can be rotated to a direction parallel to the lamp plate 1.

[0050] For details, please refer to further information. Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the narrow-angle light emission of the backlight module in this application. Figure 6 This is a schematic diagram of the wide-viewing-angle light emission of the backlight module in this application. Wherein, Figures 1-4 These are all initial timing diagrams of the backlight module of this application, that is, the first lampshade 121 and the second lampshade 122 are in a contacting state. When the first lampshade 121 and the second lampshade 122 are in contact, the light from the light source 11 shines almost perpendicularly out of the rectangular opening, resulting in a narrow viewing angle. When the first gear 131 and the second gear 132 rotate to a certain angle, the first lampshade 121 and the second lampshade 122 open by a certain angle, and the viewing angle widens accordingly. Figure 5 As shown. Until the first lampshade 121 and the second lampshade 122 are fully opened, that is, when the first lampshade 121 and the second lampshade 122 are in contact with or abutting the surface of the lamp panel 1, the viewing angle further widens, as shown. Figure 6 As shown. The opening state of the first lampshade 121 and the second lampshade 122 is determined by the contact state between the first plate 1211 and the lamp plate 1. In this embodiment, the opening of the first lampshade 121 and the second lampshade 122 is controlled by a motor 1300. The opening angle of the first lampshade 121 and the second lampshade 122 can be controlled by controlling the rotation angle of the first gear 131, thereby controlling the opening angle of the backlight module, and can be precisely controlled to the degree of opening of the angle.

[0051] This application also provides a display device, please refer to the details. Figure 7 , Figure 7 This is a schematic diagram of the structure of an embodiment of the display device of this application. Figure 7 As shown, the display device includes a backlight module 100 as described in any of the above embodiments, a display screen 200 disposed on one side of the light-emitting surface of the backlight module 100, and an optical film 300 disposed between the backlight module 100 and the display screen 200. The display device also includes a housing or drive plate 400 disposed on the side of the backlight module 100 facing away from the display screen 200, for fixing the backlight module 100 or providing a drive motor for the backlight module 100, etc., which are not limited here.

[0052] The beneficial effects of this application are: by setting a first lampshade and a second lampshade on both sides of the light source, and a first gear and a second gear of the same size connected to the lampshade, by controlling the rotation angle of the first gear, the second gear that abuts against the first gear can be controlled to rotate in the opposite direction to the first gear, thereby controlling the rotation angle of the first lampshade and the second lampshade in the direction away from or close to each other, thereby realizing the switching of the viewing angle of the light source.

[0053] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A backlight module, characterized in that, The backlight module includes: a lamp board, multiple light sources arranged in an array on the lamp board, and a first lamp cover and a second lamp cover respectively disposed on both sides of the light sources. The first lamp cover and the second lamp cover have the same shape and are L-shaped lamp covers. The backlight module further includes a first gear and a second gear disposed on the side of the lamp panel away from the light source. The first gear has a third gear protruding from the surface of the lamp panel and connected to the first lampshade. The second gear has a fourth gear protruding from the surface of the lamp panel and connected to the second lampshade. The first gear and the second gear abut against each other, and the third gear and the fourth gear are spaced apart. The radii of the third gear and the fourth gear are smaller than the radii of the first gear and the second gear. The first gear drives the second gear to rotate in the opposite direction to the first gear. The rotation of the third gear by the first gear drives the rotation of the first lampshade, and the rotation of the fourth gear by the second gear drives the rotation of the second lampshade. This causes the first lampshade and the second lampshade to rotate in a direction away from or close to each other, thereby achieving wide and narrow viewing angle switching. At least half of the third gear and the fourth gear protrudes from the lamp panel so that the first lampshade and the second lampshade can be fully opened when rotating in a direction away from each other, thereby fully exposing the light source.

2. The backlight module according to claim 1, characterized in that, Both the first lampshade and the second lampshade include a first plate and a second plate arranged perpendicularly to each other. The second plate has a serrated opening at one end away from the first plate. The serrated opening on the second plate of the first lampshade corresponds to the serrated opening on the second plate of the second lampshade, so as to retain the opening when the first lampshade and the second lampshade abut each other, thereby allowing light to pass through.

3. The backlight module according to claim 2, characterized in that, One end of the second plate is connected to the end of the first plate away from the lamp panel; wherein, the length of the second plate extending perpendicular to the end of the first plate is half the distance between the first plate of the first lampshade and the first plate of the second lampshade.

4. The backlight module according to claim 3, characterized in that, The spacing between two adjacent rows or columns of light sources is greater than twice the length of the first plate.

5. The backlight module according to claim 1, characterized in that, The first gear has the same radius as the second gear, and the third gear has the same radius as the fourth gear.

6. The backlight module according to claim 1, characterized in that, Multiple light sources in the same row or column form a group. The light sources in the same group share the first lampshade and the second lampshade, as well as the first gear and the second gear. The first gears of different groups are interconnected so that the first lampshade and the second lampshade of different groups rotate synchronously to achieve synchronous switching of viewing angle.

7. The backlight module according to claim 6, characterized in that, The first gears of different groups are interconnected by a gear belt so that rotating one of the first gears will drive the first gears of the other groups to rotate synchronously.

8. A display device, characterized in that, The display device includes a backlight module as described in any one of claims 1 to 7, a display screen disposed on one side of the light-emitting surface of the backlight module, and an optical film disposed between the backlight module and the display screen.

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