Backlight module and viewing angle adjustment method of display

Abstract

The present invention provides a backlight module and a method for adjusting the viewing angle of a display. The backlight module includes a first grating layer, a first backlight unit, a second grating layer and a second backlight unit. The first grating layer includes a plurality of first light-transmitting portions, each of which extends along a first direction. The first backlight unit includes a first light guide plate and a first light source, the first light guide plate is arranged below the first grating layer and includes a first side edge and a second side edge, the first side edge is connected to the second side edge, the length direction of the first side edge is substantially parallel to the first direction, and the first light source is arranged on the first side edge or the second side edge. The second grating layer is arranged below the first backlight unit and includes a plurality of second light-transmitting portions, each of which extends along a second direction, and the second direction is substantially perpendicular to the first direction. The second backlight unit is arranged below the second grating layer.

Description

Technical Field

[0001] The invention relates to a backlight module and a method for adjusting the viewing angle of a display, and in particular to a backlight module with switchable viewing angles and a method for adjusting the viewing angle of a display comprising the backlight module. Background Art

[0002] With the advancement of technology, electronic devices equipped with screens, such as mobile phones, tablets, laptops, car monitors, etc., have become indispensable items in modern people's lives. However, when using such electronic devices in the presence of others, your privacy may be peeped or the light and shadow emitted by the screen may disturb others.

[0003] In order to solve the above problems, some industry insiders have provided a polymer film with anti-peeping function. When the polymer film is pasted on the screen, the user needs to be in a specific field of view to see the screen image, thereby providing an anti-peeping function. However, the user needs to purchase the polymer film separately and paste it by himself, which virtually increases the cost of use and the inconvenience of operation.

[0004] Another industry provider provides a car display that adds a grating layer to the backlight module to block the light from a large viewing angle in front and behind, thereby preventing the light and shadow emitted by the screen from being projected onto the windshield and interfering with the driver's vision. However, the driver can still directly see the content on the screen, which may distract the driver and is not conducive to protecting the privacy of the user of the car display. Summary of the invention

[0005] Therefore, an object of the present invention is to provide a backlight module and a method for adjusting the viewing angle of a display to solve the above-mentioned problem.

[0006] According to the first embodiment of the first aspect of the present invention, a backlight module is provided, comprising a first grating layer, a first backlight unit, a second grating layer and a second backlight unit. The first grating layer comprises a plurality of first light-transmitting portions, each of which extends along a first direction. The first backlight unit comprises a first light guide plate and a first light source, the first light guide plate is arranged below the first grating layer, the first light guide plate comprises a first side edge and a second side edge, the first side edge is connected to the second side edge, the length direction of the first side edge is substantially parallel to the first direction, and the length direction of the second side edge is substantially perpendicular to the first direction. The first light source is arranged on the first side edge or the second side edge of the first light guide plate, and the first light source is used to provide a first light to pass through the first grating layer. The second grating layer is arranged below the first backlight unit, and the second grating layer comprises a plurality of second light-transmitting portions, each of which extends along a second direction, and the second direction is substantially perpendicular to the first direction. The second backlight unit is arranged below the second grating layer, and the second backlight unit is used to provide a second light to pass through the second grating layer.

[0007] According to the second embodiment of the first aspect of the present invention, a backlight module is provided, including a first grating layer, a second grating layer, a first backlight unit and a second backlight unit. The first grating layer includes a plurality of first light-transmitting portions, each of which extends along a first direction. The second grating layer is arranged below the first grating layer, and the second grating layer includes a plurality of second light-transmitting portions, each of which extends along a second direction, and the second direction is substantially perpendicular to the first direction. The first backlight unit includes a first light guide plate and a first light source. The first light guide plate is arranged between the first grating layer and the second grating layer. The first light source extends in a direction parallel to the first direction and perpendicular to the second direction and is located on one side of the first light guide plate, and the first light source is used to provide a first light to be projected toward the first grating layer through the first light guide plate and transmitted through at least the first light-transmitting portion. The second backlight unit is arranged below the second grating layer, and the second backlight unit is used to provide a second light to pass through the second grating layer.

[0008] According to the third embodiment of the first aspect of the present invention, a backlight module is provided, including a first grating layer, a second grating layer, a first backlight unit and a second backlight unit. The first grating layer includes a plurality of first light-transmitting portions, each of which extends along a first direction. The second grating layer is arranged below the first grating layer, and the second grating layer includes a plurality of second light-transmitting portions, each of which extends along a second direction, and the second direction is substantially perpendicular to the first direction. The first backlight unit includes a first light guide plate and a first light source, and the first light guide plate is arranged between the first grating layer and the second grating layer. The first light source extends in a direction perpendicular to the first direction and parallel to the second direction and is located on one side of the first light guide plate, and the first light source is used to provide a first light to be projected toward the first grating layer through the first light guide plate and transmitted through at least the first light-transmitting portion. The second backlight unit is arranged below the second grating layer, and the second backlight unit is used to provide a second light to pass through the second grating layer.

[0009] According to the first embodiment of the second aspect of the present invention, a method for adjusting the viewing angle of a display is provided. The display includes a display panel and a backlight module as described in the first embodiment or the second embodiment of the first aspect. The method for adjusting the viewing angle of the display can selectively execute a first wide viewing angle sharing mode and a privacy mode. The method for adjusting the viewing angle of the display includes that when the first wide viewing angle sharing mode is executed for the display panel, the first backlight unit is controlled so that the first light provided by the first light source enters the first light guide plate through the side of the first light guide plate parallel to the first direction, and the second backlight unit is controlled not to provide the second light, and when the privacy mode is executed for the display panel, the first backlight unit is controlled not to provide the first light, and the second backlight unit is controlled to provide the second light.

[0010] According to a second embodiment of the second aspect of the present invention, a method for adjusting the viewing angle of a display is provided. The display includes a display panel and a backlight module as described in the first embodiment or the third embodiment of the first aspect. The method for adjusting the viewing angle of the display can selectively execute a first bias viewing angle sharing mode and a privacy mode. The method for adjusting the viewing angle of the display includes that when the first bias viewing angle sharing mode is executed for the display panel, the first backlight unit is controlled so that the first light provided by the first light source enters the first light guide plate through the side of the first light guide plate parallel to the second direction, and the second backlight unit is controlled not to provide the second light. When the privacy mode is executed for the display panel, the first backlight unit is controlled not to provide the first light, and the second backlight unit is controlled to provide the second light.

[0011] Compared to the prior art, the present invention provides a backlight module with switchable viewing angles, which can be applied to a display and can provide a sharing mode and a privacy mode for the display, thereby helping to protect the privacy of the user and avoid disturbing others. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is an exploded schematic diagram of a backlight module according to an embodiment of the present invention.

[0013] Figure 2 is an exploded schematic diagram of a backlight module according to another embodiment of the present invention.

[0014] Figure 3 Schematic diagram of the optical path of light passing through the second grating layer according to an embodiment of the present invention.

[0015] Figure 4 yes Figure 1 Light field distribution diagram of the backlight module in the first wide viewing angle sharing mode.

[0016] Figure 5 yes Figure 1 Light field distribution diagram of the backlight module in privacy mode.

[0017] Figure 6 yes Figure 2 Light field distribution diagram of the backlight module in the first partial viewing angle sharing mode.

[0018] Figure 7 is a flowchart of the steps of a method for adjusting the viewing angle of a display according to an embodiment of the present invention.

[0019] Figure 8 is a flowchart of a method for adjusting the viewing angle of a display according to another embodiment of the present invention.

[0020] Fig. 9 is a flowchart of a method for adjusting the viewing angle of a display according to another embodiment of the present invention.

[0021] Fig.10 is a flowchart of a method for adjusting the viewing angle of a display according to another embodiment of the present invention. DETAILED DESCRIPTION

[0022] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only the directions with reference to the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the present invention. In addition, in the following embodiments, the same or similar components will be marked with the same or similar numbers.

[0023] In the present invention, two components are substantially parallel means that there is an angle between the two components, the angle is 0 degrees ± 10 degrees, preferably 0 degrees ± 5 degrees, more preferably 0 degrees ± 3 degrees, or, the angle is 180 degrees ± 10 degrees, preferably 180 degrees ± 5 degrees, more preferably 180 degrees ± 3 degrees. In the present invention, two components are substantially perpendicular means that there is an angle between the two components, the angle is 90 degrees ± 10 degrees, preferably 90 degrees ± 5 degrees, more preferably 90 degrees ± 3 degrees.

[0024] In the present invention, the backlight module can be used to provide a light source for a liquid crystal display (LCD) panel. Each component in the backlight module includes a bottom surface and a top surface. The bottom surface and the top surface are defined with the LCD panel as a reference. Each component has a side away from the LCD panel as the bottom surface, and a side facing the LCD panel as the top surface.

[0025] Reference Figure 1 , which is an exploded schematic diagram of a backlight module 10 according to an embodiment of the present invention. The backlight module 10 includes a first grating layer 100, a first backlight unit 200, a second grating layer 300 and a second backlight unit 400.

[0026] The first grating layer 100 includes a plurality of first light-transmitting portions 110 and a plurality of first light-shielding portions 120 . The first light-transmitting portions 110 and the first light-shielding portions 120 are alternately arranged and extend along a first direction D1 .

[0027] The first backlight unit 200 includes a first light guide plate 220 and a first light source 230 , and may optionally include other optical films. Here, a first brightness enhancement film 210 is taken as an example.

[0028] The first light guide plate 220 is disposed below the first grating layer 100 and between the first grating layer 100 and the second grating layer 300. The first light guide plate 220 includes a first side 221 and a second side 222, the first side 221 is connected to the second side 222, the length direction L1 of the first side 221 is substantially parallel to the first direction D1, the length direction L2 of the second side 222 is substantially perpendicular to the first direction D1 and substantially parallel to the second direction D2, and the first direction D1 is substantially perpendicular to the second direction D2.

[0029] The first light source 230 extends in a direction parallel to the first direction D1 and perpendicular to the second direction D2 and is located at the side of the first light guide plate 220. Here, the first light source 230 is disposed at the first side 221 of the first light guide plate 220. Based on the configuration of the first light source 230, the first backlight unit 200 is an edge-type backlight unit. The first light source 230 is used to provide a first light (not shown) through the first grating layer 100. Specifically, the first light source 230 is used to provide a first light projected toward the first grating layer 100 through the first light guide plate 220 and transmitted through at least one first light-transmitting portion 110.

[0030] The first brightness enhancement film 210 is disposed between the first grating layer 100 and the first light guide plate 220. The first brightness enhancement film 210 includes a surface 211 and a plurality of first light focusing structures 212. The first light focusing structures 212 are formed on the surface 211. The extension direction E1 of each first light focusing structure 212 is substantially parallel to the first direction D1. The first light focusing structures 212 can be protruding strip microstructures and face the first grating layer 100.

[0031] The second grating layer 300 is disposed below the first grating layer 100 and the first backlight unit 200. The second grating layer 300 includes a plurality of second light-transmitting portions 310 and a plurality of second light-shielding portions 320. The second light-transmitting portions 310 and the second light-shielding portions 320 are alternately arranged. The second light-transmitting portions 310 and the second light-shielding portions 320 extend along the second direction D2.

[0032] The second backlight unit 400 is disposed below the second grating layer 300, and is used to provide a second light to pass through the second grating layer 300. The second backlight unit 400 may include an optical plate 430 and a second light source 440, and may optionally include other optical films, and here, a second brightness enhancement film 410, a diffuser sheet 420, and a reflective sheet 450 are used as an example.

[0033] The optical plate 430 may include a bottom surface 432 and at least one side edge 431, and the bottom surface 432 is connected to the side edge 431. Here, the second light source 440 is disposed on the side edge 431, that is, the second backlight unit 400 is an edge-type backlight unit. In other embodiments, the second light source 440 may be disposed on the bottom surface 432, so that the second backlight unit 400 is configured as a direct type backlight unit.

[0034] The second brightness enhancement film 410 is disposed between the second grating layer 300 and the optical plate 430. The second brightness enhancement film 410 may include a surface 411 and a plurality of second light-concentrating structures 412. The second light-concentrating structures 412 are formed on the surface 411. The extension direction E2 of each second light-concentrating structure 412 is substantially parallel to the second direction D2. The second light-concentrating structures 412 may be protruding strip-shaped microstructures and face the second grating layer 300. The extension direction E1 of the first light-concentrating structures 212 is substantially perpendicular to the extension direction E2 of the second light-concentrating structures 412.

[0035] More specifically, the first grating layer 100 and the second grating layer 300 can be blind ink films, and the first grating layer 100 and the second grating layer 300 can use transparent films as substrates, and print opaque materials on one surface of the transparent films to form the first light shielding portion 120 and the second light shielding portion 320. The first light source 230 and the second light source 440 can be but are not limited to cold cathode fluorescent lamps (CCFL) or light emitting diodes (LED) light bars, and LED light bars are used as examples here. The backlight module 10 can enhance the optical properties by selectively adding other optical films. For example, by means of the first brightness enhancement film 210 and the second brightness enhancement film 410, the directionality of the emitted light can be increased to improve the front brightness. In the present embodiment, the first brightness enhancement film 210 and the second brightness enhancement film 410 are prism sheets, and the cross-sections of each first light-concentrating structure 212 and each second light-concentrating structure 412 are triangular, but the present invention is not limited thereto. In other embodiments, the cross-sections of each first light-concentrating structure 212 and each second light-concentrating structure 412 can also be configured as other shapes such as arcs. By means of the diffuser 420, the uniformity of the emitted light can be improved. By means of the reflective sheet 450, the second light leaked from the bottom surface 432 of the optical plate 430 by the second light source 440 can be reflected back into the optical plate 430, thereby improving the use efficiency of the second light source 440. Regarding the types and configurations of other optical films, they can be flexibly adjusted according to actual needs, and the present invention is not limited in implementation.

[0036] Figure 3 FIG. 1 is a schematic diagram of the optical path of the light L passing through the second grating layer 300 according to an embodiment of the present invention. Figure 3In the embodiment, the second light-transmitting portion 310 extends along the second direction D2, and can reduce the light-emitting angle A of the light L in the first direction D1 (left and right directions). Similarly, the first light-transmitting portion 110 of the first grating layer 100 extends along the first direction D1, and can reduce the light-emitting angle A of the light in the second direction D2 (front and rear directions).

[0037] Figure 4 yes Figure 1 The light field distribution diagram of the backlight module 10 in the first wide viewing angle sharing mode. Figure 4 When the first light source 230 is turned on and the second light source 440 is turned off, only the light output angle in the second direction D2 is reduced, so that the backlight module 10 can provide a first wide-view sharing mode. When the backlight module 10 is applied to a car display, it can prevent the light and shadow emitted by the screen from being projected onto the windshield and interfering with the driver's sight. In addition, when the first light source 230 is turned on and the second light source 440 is turned on, the backlight module 10 can provide a second wide-view sharing mode. Compared with the first wide-view sharing mode, since the second light source 440 is turned on, the brightness of the backlight module 10 can be increased.

[0038] Figure 5 yes Figure 1 Light field distribution diagram of the backlight module 10 in the privacy mode. Figure 5 , the first light source 230 is in the off state, and the second light source 440 is in the on state. Specifically, the light field distribution diagram 510 is the measurement result after the second light passes through the second grating layer 300, the light field distribution diagram 520 is the measurement result after the second light passes through the first brightness enhancement film 210, and the light field distribution diagram 530 is the measurement result after the second light passes through the first grating layer 100. Figure 5 It can be seen that when the second light continuously passes through the second grating layer 300 and the first grating layer 100, the light emission angles in the first direction D1 and the second direction D2 can be reduced in sequence, so that the backlight module 10 can provide a privacy mode. When the backlight module 10 is applied to a car display located at the front passenger seat, only the passenger sitting in the front passenger seat can view the contents of the screen, thereby preventing the driver from being distracted and protecting the privacy of the passenger.

[0039] According to the present invention Figure 1 When the embodiment of the backlight module 10 is applied to a display, the flowchart of the viewing angle adjustment method 700 of the display is as follows: Figure 7 The display may include a display panel (not shown) and a backlight module 10. The display panel may be an LCD panel. The display may be mounted on an electronic device such as a notebook computer, a tablet computer, a mobile phone, etc.

[0040] The viewing angle adjustment method 700 of a display includes the following steps. Step 710 is the start, and step 720 is the user selecting to execute the first wide viewing angle sharing mode or the privacy mode. When the user selects to execute the first wide viewing angle sharing mode for the display panel, step 730 is performed, the first backlight unit 200 is controlled so that the first light provided by the first light source 230 enters the first light guide plate 220 through the side of the first light guide plate 220 parallel to the first direction D1 (i.e., the first side 221), and the second backlight unit 400 is controlled not to provide the second light. When the user selects to execute the privacy mode for the display panel, step 740 is performed, the first backlight unit 200 is controlled not to provide the first light, and the second backlight unit 400 is controlled to provide the second light. Afterwards, step 750 is performed, i.e., the end. In this way, the viewing angle adjustment method 700 of the display of the present invention can selectively execute the first wide viewing angle sharing mode and the privacy mode.

[0041] Mate Reference Figure 8 , which is a step flow chart of a method 800 for adjusting the viewing angle of a display according to another embodiment of the present invention. Compared with the method 700 for adjusting the viewing angle of a display, the method 800 for adjusting the viewing angle of a display has an additional second wide viewing angle sharing mode to choose from. Step 820 is the user's choice to execute the first wide viewing angle sharing mode, the second wide viewing angle sharing mode or the privacy mode. When the user chooses to execute the second wide viewing angle sharing mode for the display panel, step 835 is performed, and the first backlight unit 200 is controlled so that the first light provided by the first light source 230 enters the first light guide plate 220 through the side of the first light guide plate 220 parallel to the first direction D1 (i.e., the first side 221), and the second backlight unit 400 is controlled to provide the second light. About Figure 8 Steps 810, 830, 840 and 850 may refer to Figure 7 Compared with the first wide viewing angle sharing mode, the second wide viewing angle sharing mode adds the second light provided by the second backlight unit 400, which can further improve the brightness.

[0042] Figure 2 1 is an exploded schematic diagram of a backlight module 10a according to another embodiment of the present invention. The backlight module 10a includes a first grating layer 100, a first backlight unit 200a, a second grating layer 300 and a second backlight unit 400. The difference between the backlight modules 10a and 10 is that the first light source 230 is disposed at a position in which Figure 2 In the embodiment, the first light source 230 extends along a direction perpendicular to the first direction D1 and parallel to the second direction D2 and is located on one side of the first light guide plate 220, that is, the first light source 230 is disposed on the second side 222 of the first light guide plate 220. In this way, the light emitting direction of the first light source 230 is toward the left side of the first direction D1.

[0043] Figure 6 is based on Figure 2 Light field distribution diagram of the backlight module 10a in the first bias angle sharing mode. Figure 6 , the first light source 230 is turned on and the second light source 440 is turned off, so only the light emitting angle in the second direction D2 is reduced, and the light emitting direction is toward the left side of the first direction D1, so that the backlight module 10a can provide a first bias angle sharing mode. When the backlight module 10a is applied to a car display, it can prevent the light and shadow emitted by the display screen from being projected onto the windshield and interfering with the driver's sight, and it can prevent the reflection of the right window from interfering with the screen image. When the car is configured as a left-hand drive system, it can reduce the interference of reflections on the passenger in the front passenger seat.

[0044] When the first light source 230 and the second light source 440 are both turned on, the backlight module 10a can provide a second bias angle sharing mode. Compared with the first bias angle sharing mode, the brightness of the backlight module 10a can be increased because the second light source 440 is turned on.

[0045] When the first light source 230 is in the off state and the second light source 440 is in the on state, the backlight module 10a can provide a privacy mode. The difference between the backlight module 10a and the backlight module 10 is only the configuration position of the first light source 230. Since the first light source 230 is in the off state in the privacy mode, the light field distribution diagram of the backlight module 10a in the privacy mode is the same as that of the backlight module 10 and can be referred to. Figure 5 .

[0046] According to the present invention Figure 2 When another embodiment of the backlight module 10a is applied to a display, the flowchart of the viewing angle adjustment method 900 of the display is as follows: Fig. 9 The display may include a display panel (not shown) and a backlight module 10a. For details about the display, please refer to Figure 7 Related instructions.

[0047] The viewing angle adjustment method 900 of the display includes the following steps. Step 910 is the start, and step 920 is the user's selection of executing the first bias angle sharing mode or the privacy mode. When the user chooses to execute the first bias angle sharing mode for the display panel, step 930 is performed, the first backlight unit 200a is controlled so that the first light provided by the first light source 230 enters the first light guide plate 220 through the side of the first light guide plate 220 parallel to the second direction D2 (i.e., the second side 222), and the second backlight unit 400 is controlled not to provide the second light. When the user chooses to execute the privacy mode for the display panel, step 940 is performed, the first backlight unit 200a is controlled not to provide the first light, and the second backlight unit 400 is controlled to provide the second light. Afterwards, step 950 is performed, that is, the end. In this way, the viewing angle adjustment method 900 of the display of the present invention can selectively execute the first bias angle sharing mode and the privacy mode.

[0048] Fig.10 This is a step flow chart of a method 1000 for adjusting the viewing angle of a display according to another embodiment of the present invention. Compared to the method 900 for adjusting the viewing angle of a display, the method 1000 for adjusting the viewing angle of a display has an additional optional second bias viewing angle sharing mode. Step 1020 is the user's choice to execute the first bias viewing angle sharing mode, the second bias viewing angle sharing mode or the privacy mode. When the user chooses to execute the second bias viewing angle sharing mode for the display panel, step 1035 is performed, and the first backlight unit 200a is controlled so that the first light provided by the first light source 230 enters the first light guide plate 220 through the side of the first light guide plate 220 parallel to the second direction D2 (i.e., the second side 222), and the second backlight unit 400 is controlled to provide the second light. About Fig.10 Steps 1010, 1030, 1040 and 1050 may refer to Fig. 9 Compared with the first bias angle sharing mode, the second bias angle sharing mode adds the second light provided by the second backlight unit 400, which can further improve the brightness.

[0049] Re-reference Figure 2In other embodiments, when the car is configured as a right-hand drive system, the first light source 230 can be disposed on the other second side 223 of the first light guide plate 220, so that the light emitting direction of the first light source 230 is toward the right direction of the first direction D1, and the reflection of the left window can be prevented from interfering with the image of the display screen, that is, the backlight module of other embodiments can provide a third bias angle sharing mode. Under this configuration, when the first light source 230 and the second light source 440 are both turned on, the backlight module can provide a fourth bias angle sharing mode. In other embodiments, the first light source 230 can be disposed on the first side 221, the second side 222, and the second side 223 of the first light guide plate 220 at the same time, so that the backlight module can selectively provide the first and second wide viewing angle sharing modes, the first to fourth bias angle sharing modes, and the privacy mode, thereby enhancing the versatility of the backlight module.

[0050] Compared to the prior art, the present invention provides a backlight module with switchable viewing angles, which can be applied to displays and can provide sharing mode and privacy mode for the display, which is beneficial to protecting the privacy of the user and avoiding interference with others. When applied to a car display, in the sharing mode, it can prevent the light and shadow of the display screen from being projected onto the windshield and interfering with the driver's line of sight. In the privacy mode, it can prevent the driver from seeing the content of the display screen, which can avoid distraction and help protect the privacy of passengers. The backlight module provided by the present invention can further adjust the position of the first light source so that the light output angle in the sharing mode is biased to the right or left side, thereby preventing the light and shadow of the left or right window from interfering with the screen picture, which is beneficial to further improve the image quality of the display.

[0051] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope covered by the claims of the present invention.

[0052] Explanation of symbols

[0053] 10,10a Backlight module

[0054] 100 First grating layer

[0055] 110 first light-transmitting portion

[0056] 120 first light shielding portion

[0057] 200, 200a first backlight unit

[0058] 210 First Brightness Enhancement Film

[0059] 211,411 Surface

[0060] 212 First Focusing Structure

[0061] 220 First light guide plate

[0062] 221 First side

[0063] 222,223 Second side

[0064] 230 First Light Source

[0065] 300 Second grating layer

[0066] 310 Second light-transmitting portion

[0067] 320 second light shielding part

[0068] 400 Second backlight unit

[0069] 410 Second Brightness Enhancement Film

[0070] 412 Second focusing structure

[0071] 420 Diffuser

[0072] 430 Optical Plate

[0073] 431 Side

[0074] 432 Bottom

[0075] 440 Second Light Source

[0076] 450 reflective sheet

[0077] 510,520,530 light field distribution diagram

[0078] How to adjust the viewing angle of 700, 800, 900, 1000 monitors

[0079] Steps 710, 720, 730, 740, 750

[0080] Steps 810,820,830,835,840,850

[0081] 910,920,930,940,550 steps

[0082] Steps 1010, 1020, 1030, 1035, 1040, 1050

[0083] A light angle

[0084] D1 First direction

[0085] D2 Second direction

[0086] E1, E2 extension direction

[0087] L1, L2 length direction

[0088] L light.

Claims

1. A backlight module, characterized in that include: A first grating layer includes a plurality of first light-transmitting portions, each of which extends along a first direction; The first backlight unit comprises: a first light guide plate, disposed below the first grating layer, the first light guide plate comprising a first side and a second side, the first side being connected to the second side, a length direction of the first side being substantially parallel to the first direction, and a length direction of the second side being substantially perpendicular to the first direction; and A first light source is disposed on the first side or the second side of the first light guide plate, and the first light source is used to provide a first light to pass through the first grating layer; a second grating layer disposed below the first backlight unit, the second grating layer comprising a plurality of second light-transmitting portions, each of the second light-transmitting portions extending along a second direction, the second direction being substantially perpendicular to the first direction; and The second backlight unit is disposed below the second grating layer, and is used for providing a second light to pass through the second grating layer.

2. The backlight module according to claim 1, characterized in that: The first grating layer and the second grating layer are shutter ink films respectively.

3. The backlight module according to claim 1, characterized in that: The first backlight unit further includes: The first brightness enhancement film is disposed between the first grating layer and the first light guide plate. The first brightness enhancement film includes a surface and a plurality of first light focusing structures. The first light focusing structures are formed on the surface. The extension direction of each of the first light focusing structures is substantially parallel to the first direction.

4. The backlight module according to claim 3, characterized in that: The first light-condensing structure of the first brightness enhancement film is a protruding strip-shaped microstructure facing the first grating layer.

5. The backlight module according to claim 1, characterized in that: The second backlight unit comprises: An optical plate comprising a bottom surface and at least one side edge, wherein the bottom surface is connected to the side edge; and The second light source is disposed on the bottom surface or the side edge of the optical plate, and the second light source is used to provide the second light.

6. The backlight module according to claim 5, characterized in that: The second backlight unit further includes: The second brightness enhancement film is disposed between the second grating layer and the optical plate. The second brightness enhancement film includes a surface and a plurality of second light-concentrating structures. The second light-concentrating structures are formed on the surface. The extension direction of each second light-concentrating structure is substantially parallel to the second direction.

7. The backlight module according to claim 6, characterized in that: The second light-condensing structure of the second brightness enhancement film is a protruding strip-shaped microstructure facing the second grating layer.

8. The backlight module according to claim 5, characterized in that: The first backlight unit also includes a first brightness enhancement film, which is arranged between the first grating layer and the first light guide plate. The second backlight unit also includes a second brightness enhancement film, which is arranged between the second grating layer and the optical plate. The first brightness enhancement film includes a plurality of first light-focusing structures, and the second brightness enhancement film includes a plurality of second light-focusing structures. The extension direction of each of the first light-focusing structures is substantially perpendicular to the extension direction of each of the second light-focusing structures.

9. A backlight module, characterized in that include: A first grating layer includes a plurality of first light-transmitting portions, each of which extends along a first direction; A second grating layer is disposed below the first grating layer, the second grating layer comprises a plurality of second light-transmitting portions, each of the second light-transmitting portions extends along a second direction, and the second direction is substantially perpendicular to the first direction; The first backlight unit comprises: A first light guide plate is disposed between the first grating layer and the second grating layer; and a first light source extending in a direction parallel to the first direction and perpendicular to the second direction and located at a side of the first light guide plate, the first light source being used to provide a first light beam projected toward the first grating layer via the first light guide plate and transmitted through at least one of the first light-transmitting portions; and The second backlight unit is disposed below the second grating layer, and is used for providing a second light to pass through the second grating layer.

10. The backlight module according to claim 9, characterized in that: The first grating layer and the second grating layer are shutter ink films respectively.

11. The backlight module according to claim 9, characterized in that: The first backlight unit further includes: The first brightness enhancement film is disposed between the first grating layer and the first light guide plate. The first brightness enhancement film includes a surface and a plurality of first light focusing structures. The first light focusing structures are formed on the surface. The extension direction of each of the first light focusing structures is substantially parallel to the first direction.

12. The backlight module according to claim 11, characterized in that: The first light-condensing structure of the first brightness enhancement film is a protruding strip-shaped microstructure facing the first grating layer.

13. The backlight module according to claim 9, characterized in that: The second backlight unit comprises: An optical plate comprising a bottom surface and at least one side edge, wherein the bottom surface is connected to the side edge; and The second light source is disposed on the bottom surface or the side edge of the optical plate, and the second light source is used to provide the second light.

14. The backlight module according to claim 13, characterized in that: The second backlight unit further includes: The second brightness enhancement film is disposed between the second grating layer and the optical plate. The second brightness enhancement film includes a surface and a plurality of second light-concentrating structures. The second light-concentrating structures are formed on the surface. The extension direction of each second light-concentrating structure is substantially parallel to the second direction.

15. The backlight module according to claim 14, characterized in that: The second light-condensing structure of the second brightness enhancement film is a protruding strip-shaped microstructure facing the second grating layer.

16. The backlight module according to claim 13, characterized in that: The first backlight unit also includes a first brightness enhancement film, which is arranged between the first grating layer and the first light guide plate. The second backlight unit also includes a second brightness enhancement film, which is arranged between the second grating layer and the optical plate. The first brightness enhancement film includes a plurality of first light-focusing structures, and the second brightness enhancement film includes a plurality of second light-focusing structures. The extension direction of each of the first light-focusing structures is substantially perpendicular to the extension direction of each of the second light-focusing structures.

17. A backlight module, characterized in that include: A first grating layer includes a plurality of first light-transmitting portions, each of which extends along a first direction; A second grating layer is disposed below the first grating layer, the second grating layer comprises a plurality of second light-transmitting portions, each of the second light-transmitting portions extends along a second direction, and the second direction is substantially perpendicular to the first direction; The first backlight unit comprises: A first light guide plate is disposed between the first grating layer and the second grating layer; and a first light source extending in a direction perpendicular to the first direction and parallel to the second direction and located at a side of the first light guide plate, the first light source being used to provide a first light beam projected toward the first grating layer via the first light guide plate and transmitted through at least one of the first light-transmitting portions; and The second backlight unit is disposed below the second grating layer, and is used for providing a second light to pass through the second grating layer.

18. The backlight module according to claim 17, characterized in that: The first grating layer and the second grating layer are shutter ink films respectively.

19. The backlight module according to claim 17, characterized in that: The first backlight unit further includes: The first brightness enhancement film is disposed between the first grating layer and the first light guide plate. The first brightness enhancement film includes a surface and a plurality of first light focusing structures. The first light focusing structures are formed on the surface. The extension direction of each of the first light focusing structures is substantially parallel to the first direction.

20. The backlight module according to claim 19, characterized in that: The first light-condensing structure of the first brightness enhancement film is a protruding strip-shaped microstructure facing the first grating layer.

21. The backlight module according to claim 17, characterized in that: The second backlight unit comprises: An optical plate comprising a bottom surface and at least one side edge, wherein the bottom surface is connected to the side edge; and The second light source is disposed on the bottom surface or the side edge of the optical plate, and the second light source is used to provide the second light.

22. The backlight module according to claim 21, characterized in that: The second backlight unit further includes: The second brightness enhancement film is disposed between the second grating layer and the optical plate. The second brightness enhancement film includes a surface and a plurality of second light-concentrating structures. The second light-concentrating structures are formed on the surface. The extension direction of each second light-concentrating structure is substantially parallel to the second direction.

23. The backlight module according to claim 22, characterized in that: The second light-condensing structure of the second brightness enhancement film is a protruding strip-shaped microstructure facing the second grating layer.

24. The backlight module according to claim 21, characterized in that: The first backlight unit also includes a first brightness enhancement film, which is arranged between the first grating layer and the first light guide plate. The second backlight unit also includes a second brightness enhancement film, which is arranged between the second grating layer and the optical plate. The first brightness enhancement film includes a plurality of first light-focusing structures, and the second brightness enhancement film includes a plurality of second light-focusing structures. The extension direction of each of the first light-focusing structures is substantially perpendicular to the extension direction of each of the second light-focusing structures.

25. A method for adjusting the viewing angle of a display, characterized in that: The display comprises a display panel and a backlight module according to claim 1 or 9, the viewing angle adjustment method of the display can selectively execute a first wide viewing angle sharing mode and a privacy mode, and the viewing angle adjustment method of the display comprises: When the first wide-viewing angle sharing mode is executed for the display panel, the first backlight unit is controlled so that the first light provided by the first light source enters the first light guide plate via a side of the first light guide plate parallel to the first direction, and the second backlight unit is controlled not to provide the second light; and When the privacy mode is executed to the display panel, the first backlight unit is controlled not to provide the first light, and the second backlight unit is controlled to provide the second light.

26. The method for adjusting the viewing angle of a display according to claim 25, characterized in that It also includes selectively executing a second wide-viewing angle sharing mode, wherein, when the second wide-viewing angle sharing mode is executed for the display panel, the first backlight unit is controlled so that the first light provided by the first light source enters the first light guide plate through the side of the first light guide plate parallel to the first direction, and the second backlight unit is controlled to provide the second light.

27. A method for adjusting the viewing angle of a display, characterized in that: The display comprises a display panel and a backlight module according to claim 1 or 17, the viewing angle adjustment method of the display can selectively execute a first bias viewing angle sharing mode and a privacy mode, and the viewing angle adjustment method of the display comprises: When the first bias angle sharing mode is executed for the display panel, the first backlight unit is controlled so that the first light provided by the first light source enters the first light guide plate via a side of the first light guide plate parallel to the second direction, and the second backlight unit is controlled not to provide the second light; and When the privacy mode is executed to the display panel, the first backlight unit is controlled not to provide the first light, and the second backlight unit is controlled to provide the second light.

28. The method for adjusting the viewing angle of a display according to claim 27, characterized in that It also includes selectively executing a second bias angle sharing mode, wherein, when the second bias angle sharing mode is executed for the display panel, the first backlight unit is controlled so that the first light provided by the first light source enters the first light guide plate through the side of the first light guide plate parallel to the second direction, and the second backlight unit is controlled to provide the second light.

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