TW202131073A - Backlight module and method for adjusting viewing angle of display - Google Patents

Abstract

A 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 the first light transmitting portions is extended 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 disposed below the first grating layer and includes a first side and a second side. The first side is connected to the second side. A length direction of the first side is substantially parallel to the first direction. The first light source is disposed on the first side or the second side. The second grating layer is disposed below the first backlight unit and includes a plurality of second light transmitting portions. Each of the second light transmitting portions is extended along a second direction. The second direction is substantially perpendicular to the first direction. The second backlight unit is disposed below the second grating layer.

Description

Backlight module and display viewing angle adjustment method

The present invention relates to a backlight module and a method for adjusting the viewing angle of a display, and more particularly to a backlight module with a switchable viewing angle and a method for adjusting the viewing angle of a display including the backlight module.

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 life. However, when such electronic devices are used in situations where there are others, their privacy may be caught or the light and shadow emitted by the screen may interfere with others.

In order to solve the aforementioned problems, some companies provide a polymer film with anti-peep function. When the polymer film is pasted on the screen, the user needs to be within a specific field of view to see the screen, which can provide Anti-peep function. However, the user needs to purchase the polymer film separately and stick it by himself, which virtually increases the use cost and the inconvenience of operation.

Another industry manufacturer provides a car display, which adds a layer of grating to the backlight module to block the front and rear large viewing angles of light, so as to prevent the light and shadow emitted by the screen from being projected on the windshield and interfering with the driver's line of sight However, the driver can still directly see the contents of the screen, which may cause the driver to be distracted, and is not conducive to protecting the privacy of the user of the car display.

The purpose 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 problems.

According to the first embodiment of the first aspect of the present invention, a backlight module is provided, which 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 parts, and each first light-transmitting part 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 disposed under the first grating layer. The first light guide plate includes a first side and a second side. The first side Connected to the second side, a length direction of the first side is substantially parallel to the first direction, and a length direction of the second side is substantially perpendicular to the first direction. The first light source is arranged on the first side or the second side of the first light guide plate, and the first light source is used for providing a first light to pass through the first grating layer. The second grating layer is disposed under the first backlight unit. The second grating layer includes a plurality of second light-transmitting parts. Each second light-transmitting part extends along a second direction, and the second direction is substantially perpendicular to the first direction. The second backlight unit is disposed under the second grating layer, and the second backlight unit is used for providing a second light to pass through the second grating layer.

According to a second embodiment of the first aspect of the present invention, a backlight module is provided, which includes 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 parts, and each first light-transmitting part extends along a first direction. The second grating layer is disposed under the first grating layer. The second grating layer includes a plurality of second light-transmitting parts. Each second light-transmitting part 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. The first light source is used to provide a first light beam to be projected toward the first grating layer through the first light guide plate And it passes through at least one first light-transmitting part. The second backlight unit is disposed under the second grating layer, and the second backlight unit is used for providing a second light to pass through the second grating layer.

According to a third embodiment of the first aspect of the present invention, a backlight module is provided, which includes 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 parts, and each first light-transmitting part extends along a first direction. The second grating layer is disposed under the first grating layer. The second grating layer includes a plurality of second light-transmitting parts. Each second light-transmitting part 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 disposed between the first grating layer and the second grating layer. The first light source extends along 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. The first light source is used to provide a first light beam to be projected toward the first grating layer through the first light guide plate And it passes through at least one first light-transmitting part. The second backlight unit is disposed under the second grating layer, and the second backlight unit is used for providing a second light to pass through the second grating layer.

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 viewing angle adjustment method of the display can optionally execute a first wide viewing angle sharing mode and a privacy mode. The viewing angle adjustment method of the display includes when the first wide viewing angle sharing mode is performed to the display panel, the first backlight unit is controlled so that the first light provided by the first light source is parallel to the first direction through the first light guide plate The side enters the first light guide plate, and the second backlight unit is controlled to not provide the second light, and when the privacy mode is performed to the display panel, the first backlight unit is controlled to not provide the first light, and the second backlight unit Is controlled to provide a second light.

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 viewing angle adjustment method of the display can selectively execute a first angle sharing mode and a privacy mode. The viewing angle adjustment method of the display includes when the first angle sharing mode is executed to the display panel, the first backlight unit is controlled to make 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 not provide the second light. When the privacy mode is performed to the display panel, the first backlight unit is controlled to not provide the first light, and the second backlight unit is controlled to provide the second light.

Compared with the prior art, the present invention provides a backlight module with switchable viewing angle, which can be applied to displays, and can provide sharing mode and privacy mode to the display, which is beneficial to protect the privacy of users and avoid interference with others. .

The foregoing and other technical content, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., only refer to the directions of the attached drawings. Therefore, the directional terms used are for illustration, not for limiting the present invention. In addition, in the following embodiments, the same or similar elements will use the same or similar reference numerals.

In the present invention, the fact that two elements are substantially parallel means that there is an included angle between the two elements, and the included angle is 0°±10°, preferably 0°±5°, more preferably 0°±3°, or the included angle It is 180 degrees ± 10 degrees, preferably 180 degrees ± 5 degrees, more preferably 180 degrees ± 3 degrees. In the present invention, two elements are substantially perpendicular to mean that there is an included angle between the two elements, and the included angle is 90°±10°, preferably 90°±5°, and more preferably 90°±3°.

In the present invention, the backlight module can be used to provide the light source of a liquid crystal display (LCD) panel. Each element in the backlight module includes a bottom surface and a top surface. The definition of the bottom surface and the top surface is based on the LCD panel. As a benchmark, the side away from the LCD panel is the bottom surface of each element, and the side facing the LCD panel is the top surface.

Please refer to FIG. 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.

The first grating layer 100 includes a plurality of first light-transmitting parts 110 and a plurality of first light-shielding parts 120. The first light-transmitting parts 110 and the first light-shielding parts 120 are arranged alternately, and the first light-transmitting parts 110 and the first light-shielding parts 120 are arranged in a staggered manner. It extends along the first direction D1.

The first backlight unit 200 includes a first light guide plate 220 and a first light source 230, and optionally further includes other optical films. Here, further includes a first brightness enhancement film (Brightness Enhancement Film) 210 as an example.

The first light guide plate 220 is disposed under 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 two sides 222 is substantially perpendicular to the first direction D1 and substantially parallel to the second direction D2. The first direction D1 and the second direction D2 are substantially perpendicular.

The first light source 230 extends along a direction parallel to the first direction D1 and perpendicular to the second direction D2 and is located on one side of the first light guide plate 220. Here, the first light source 230 is disposed on the first light guide plate 220. On the side 221, based on the configuration of the first light source 230, the first backlight unit 200 belongs to an edge type backlight unit. The first light source 230 is used to provide the first light (not shown) to pass through the first grating layer 100. Specifically, the first light source 230 is used to provide the first light to be projected toward the first grating layer 100 through the first light guide plate 220 And it passes through at least one first light-transmitting part 110.

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 concentrating structures 212. The first light concentrating structures 212 are formed on On the surface 211, the extending direction E1 of each first light-concentrating structure 212 is substantially parallel to the first direction D1. The first light-concentrating structure 212 may be a protruding strip-shaped micro structure and facing the first grating layer 100.

The second grating layer 300 is disposed under the first grating layer 100 and the first backlight unit 200. The second grating layer 300 includes a plurality of second light-transmitting parts 310 and a plurality of second light-shielding parts 320, and the second light-transmitting part 310 The second light-shielding portion 320 and the second light-shielding portion 320 are arranged alternately, and the second light-transmitting portion 310 and the second light-shielding portion 320 extend along the second direction D2.

The second backlight unit 400 is disposed under the second grating layer 300, and the second backlight unit 400 is used to provide the 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 optionally may further include other optical films. Here, it may further include a second brightness enhancement film 410 and a diffusion sheet 420 And a reflective sheet 450 is an example.

The optical plate 430 may include a bottom surface 432 and at least one side 431. The bottom surface 432 is connected to the side 431. Here, the second light source 440 is disposed on the side 431, that is, the second backlight unit 400 is an edge-lit 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.

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 structure 412 may be a protruding strip-shaped microstructure and facing the second grating layer 300. The extension direction E1 of the first concentrating structure 212 is substantially perpendicular to the extension direction E2 of the second concentrating structure 412.

More specifically, the first grating layer 100 and the second grating layer 300 may be louver ink films, and the first grating layer 100 and the second grating layer 300 may use a transparent film as a substrate, and one of the transparent films An opaque material is printed on the surface to form the first shading portion 120 and the second shading portion 320. The first light source 230 and the second light source 440 can be, but are not limited to, a cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp, CCFL) or a light emitting diode (Light Emitting Diode, LED) light bar. Here, the LED light bar is Exemplify. The backlight module 10 can be optionally added with other optical films to improve optical properties. For example, with 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 this embodiment, the first brightness enhancement film 210 and the second brightness enhancement film 410 are Prism Sheet, and the cross section of each first concentrating structure 212 and each second concentrating structure 412 is triangular, but the present invention is not limited to this. In other embodiments, each first concentrating structure The cross-sections of 212 and each of the second light-concentrating structures 412 can also be configured in other shapes such as circular arcs. With the diffusion sheet 420, the uniformity of the light can be improved. With the reflective sheet 450, the second light from the second light source 440 leaked from the bottom surface 432 of the optical plate 430 can be reflected back into the optical plate 430, and the use efficiency of the second light source 440 can be improved. Regarding the types and configurations of other optical films, they can be flexibly adjusted according to actual needs, and the implementation of the present invention is not limited.

FIG. 3 is a schematic diagram of the optical path of light L passing through the second grating layer 300 according to an embodiment of the present invention. In Figure 3, the second light-transmitting portion 310 extends along the second direction D2, and can reduce the light exit 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 exit angle of the light in the second direction D2 (front and rear directions).

FIG. 4 is a light field distribution diagram of the backlight module 10 of FIG. 1 in the first wide viewing angle sharing mode. When measuring Figure 4, the first light source 230 is in the on state and the second light source 440 is in the off state. Therefore, only the light output angle in the second direction D2 is reduced, so that the backlight module 10 can provide the first wide viewing angle 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 on the windshield and disturbing the driver's line of sight. In addition, when the first light source 230 is in the on state and the second light source 440 is in the on state, the backlight module 10 can provide the second wide viewing angle sharing mode. Compared with the first wide viewing angle sharing mode, the second light source 440 is in the on state. , The brightness of the backlight module 10 can be improved.

FIG. 5 is a light field distribution diagram of the backlight module 10 in FIG. 1 in the privacy mode. When measuring Figure 5, the first light source 230 is in the off state, and the second light source 440 is in the on state. In detail, the light field distribution map 510 is the measurement result of the second light after passing through the second grating layer 300, and the light field distribution map 520 is the measurement result of the second light passing through the first brightness enhancement film 210, and the light field distribution is FIG. 530 is the measurement result of the second light after passing through the first grating layer 100. It can be seen from FIG. 5 that when the second light continuously passes through the second grating layer 300 and the first grating layer 100, the light output angles of the first direction D1 and the second direction D2 can be reduced in sequence, so that the backlight module 10 can be Provide privacy mode. When the backlight module 10 is applied to a car display located in the passenger seat, only the passengers sitting in the passenger seat can view the contents of the screen, which can prevent the driver from being distracted and help protect the privacy of the passengers.

When an embodiment of the backlight module 10 shown in FIG. 1 is applied to a display according to the present invention, the flow chart of the method 700 for adjusting the viewing angle of the display is as shown in FIG. 7. The display may include a display panel (not shown) and a backlight module 10, the display panel may be an LCD panel, and the display may be mounted on an electronic device, such as a notebook computer, a tablet computer, and a mobile phone.

The method 700 for adjusting the viewing angle of the display includes the following steps. Step 710 is the start, and step 720 is the user chooses to execute a first wide-view sharing mode or a privacy mode. When the user chooses to execute the first wide-view sharing mode for the display panel, proceed to step 730, and the first backlight unit 200 is Control 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 (ie, the first side 221), and the second backlight The unit 400 is controlled to not provide the second light. When the user chooses to execute the privacy mode for the display panel, step 740 is performed, the first backlight unit 200 is controlled to not provide the first light, and the second backlight unit 400 is controlled to provide the second light. After that, proceed to step 750, which ends. In this way, the viewing angle adjustment method 700 of the present invention can optionally execute the first wide viewing angle sharing mode and the privacy mode.

With reference to FIG. 8, it is a flowchart of steps of a method 800 for adjusting the viewing angle of a display according to another embodiment of the present invention. Compared with the display viewing angle adjustment method 700, the display viewing angle adjustment method 800 has a second wide viewing angle sharing mode to choose from. In step 820, the user chooses to execute a first wide viewing angle sharing mode, a second wide viewing angle sharing mode, or In a privacy mode, when the user chooses to execute the second wide viewing angle sharing mode to 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 passes through the first light guide plate The side of 220 parallel to the first direction D1 (ie, the first side 221) enters the first light guide plate 220, and the second backlight unit 400 is controlled to provide the second light. For steps 810, 830, 840, and 850 in FIG. 8, please refer to steps 710, 730, 740, and 750 in FIG. 7, respectively. Compared with the first wide viewing angle sharing mode, the second wide viewing angle sharing mode increases the second light provided by the second backlight unit 400, which can further improve the brightness.

FIG. 2 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 lies in the position where the first light source 230 is arranged. In Figure 2, the first light source 230 extends in a direction perpendicular to the first direction D1 and parallel to the second direction D2 and is located in the first guide. One side of the light plate 220, that is, the first light source 230 is disposed on the second side 222 of the first light guide plate 220. Thereby, the light output direction of the first light source 230 can be toward the left side of the first direction D1.

FIG. 6 is a light field distribution diagram of the backlight module 10a of FIG. 2 in the first angular viewing angle sharing mode. In the measurement of Figure 6, the first light source 230 is in the on state and the second light source 440 is in the off state. Therefore, only the light exit angle in the second direction D2 is reduced, and the light exit direction is toward the left side of the first direction D1, and The backlight module 10a can provide the first partial viewing 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 on the windshield to interfere with the driver's line of sight, and it can prevent the reflective reflection of the right window from interfering with the screen image. When the car is configured as The left-hand drive system can reduce the interference of reflective reflections on the passengers in the front passenger seat.

When both the first light source 230 and the second light source 440 are in the on state, the backlight module 10a can provide the second angle of view sharing mode. Compared with the first angle of view sharing mode, since the second light source 440 is in the on state, the backlight can be improved The brightness of the module 10a.

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. Based on the difference between the backlight module 10a and the backlight module 10, the only difference between the first light source 230 is the location of the first light source 230, due to privacy In the mode, the first light source 230 is turned off. Therefore, 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 refer to FIG. 5.

When another embodiment of the backlight module 10a shown in FIG. 2 according to the present invention is applied to a display, the flow chart of the method 900 for adjusting the viewing angle of the display is as shown in FIG. The display may include a display panel (not shown) and a backlight module 10a. For details of the display, refer to the related description in FIG. 7.

The method 900 for adjusting the viewing angle of the display includes the following steps. Step 910 is the start, and step 920 is the user chooses to execute a first angle sharing mode or a privacy mode. When the user chooses to execute the first angle sharing mode to the display panel, proceed to step 930, and the first backlight unit 200a is Control 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 (ie, the second side 222), and the second backlight The unit 400 is controlled to not 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 to not provide the first light, and the second backlight unit 400 is controlled to provide the second light. After that, step 950 is performed, which ends. In this way, the viewing angle adjustment method 900 of the present invention can optionally execute the first bias viewing angle sharing mode and the privacy mode.

FIG. 10 is a flowchart of steps of a method 1000 for adjusting the viewing angle of a display according to another embodiment of the present invention. Compared with the viewing angle adjustment method 900 of the display, the viewing angle adjustment method 1000 of the display has more options for the second angular viewing angle sharing mode. In step 1020, the user chooses to execute a first angular viewing angle sharing mode, a second angular viewing angle sharing mode, or In a privacy mode, when the user chooses to execute the second partial viewing angle sharing mode to 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 passes through the first light guide plate The side of 220 parallel to the second direction D2 (ie, the second side 222) enters the first light guide plate 220, and the second backlight unit 400 is controlled to provide the second light. For steps 1010, 1030, 1040, and 1050 in FIG. 10, please refer to steps 910, 930, 940, and 950 in FIG. 9, respectively. Compared with the first angular viewing angle sharing mode, the second angular viewing angle sharing mode increases the second light provided by the second backlight unit 400, which can further improve the brightness.

Please refer to Figure 2 again. In 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, thereby enabling The light output direction of the first light source 230 is toward the right side of the first direction D1, which can prevent the reflection of the left window from interfering with the display screen. That is, the backlight module of other embodiments can provide the third angle sharing mode . In this configuration, when the first light source 230 and the second light source 440 are both in the on state, the backlight module can provide a fourth angular viewing angle sharing mode. In other embodiments, the first light source 230 can be provided on the first side 221, the second side 222, and 223 of the first light guide plate 220 at the same time, so that the backlight module can optionally provide the first and second sides. Wide viewing angle sharing mode, first to fourth viewing angle sharing mode, and privacy mode to enhance the versatility of the backlight module.

Compared with the prior art, the present invention provides a backlight module with switchable viewing angle, which can be applied to a display, and can provide a sharing mode and a privacy mode to the display, so as to protect the privacy of the user and avoid 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 on the windshield and disturbing 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 be avoided. Drivers are distracted 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 to shift the light output angle in the sharing mode to the right or the left, thereby preventing the light and shadow of the left or right window from interfering with the screen image, which is beneficial to further improvement The image quality of the monitor. The foregoing descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the present invention.

10, 10a: Backlight module 100: the first grating layer 110: The first light-transmitting part 120: The first shading part 200, 200a: the first backlight unit 210: The first brightness enhancement film 211,411: Surface 212: The first concentrating structure 220: The first light guide plate 221: first side 222,223: second side 230: the first light source 300: second grating layer 310: second light transmission part 320: second shading part 400: second backlight unit 410: The second brightness enhancement film 412: second concentrating structure 420: diffuser 430: Optical Board 431: side 432: Bottom 440: second light source 450: reflective sheet 510,520,530: light field distribution map 700, 800, 900, 1000: How to adjust the viewing angle of the monitor 710,720,730,740,750: steps 810,820,830,835,840,850: steps 910,920,930,940,550: steps 1010, 1020, 1030, 1035, 1040, 1050: steps A: Light angle D1: First direction D2: second direction E1, E2: extension direction L1, L2: length direction L: light

FIG. 1 is an exploded schematic diagram of a backlight module according to an embodiment of the present invention. FIG. 2 is an exploded schematic diagram of a backlight module according to another embodiment of the present invention. FIG. 3 is a schematic diagram of the optical path of light passing through the second grating layer according to an embodiment of the present invention. FIG. 4 is a light field distribution diagram of the backlight module of FIG. 1 in the first wide viewing angle sharing mode. Fig. 5 is a light field distribution diagram of the backlight module of Fig. 1 in the privacy mode. FIG. 6 is a light field distribution diagram of the backlight module of FIG. 2 in the first partial viewing angle sharing mode. FIG. 7 is a flowchart of steps of a method for adjusting the viewing angle of a display according to an embodiment of the present invention. FIG. 8 is a flowchart of steps of a method for adjusting the viewing angle of a display according to another embodiment of the present invention. FIG. 9 is a flowchart of steps of a method for adjusting the viewing angle of a display according to another embodiment of the present invention. FIG. 10 is a flowchart of steps of a method for adjusting the viewing angle of a display according to another embodiment of the present invention.

10: Backlight module

100: the first grating layer

110: The first light-transmitting part

120: The first shading part

200: The first backlight unit

210: The first brightness enhancement film

211,411: Surface

212: The first concentrating structure

220: The first light guide plate

221: first side

222: second side

230: the first light source

300: second grating layer

310: second light transmission part

320: second shading part

400: second backlight unit

410: The second brightness enhancement film

412: second concentrating structure

420: diffuser

430: Optical Board

431: side

432: Bottom

440: second light source

450: reflective sheet

D1: First direction

D2: second direction

E1, E2: extension direction

L1, L2: length direction

Claims (14)

A backlight module, including: A first grating layer including a plurality of first light-transmitting parts, each of the first light-transmitting parts extends along a first direction; A first backlight unit, including: A first light guide plate is disposed under the first grating layer. The first light guide plate includes a first side and a second side. The first side is connected to the second side. A length direction of the side is substantially parallel to the first direction, and a length direction of the second side is substantially perpendicular to the first direction; and A first light source disposed on the first side or the second side of the first light guide plate, the first light source is used to provide a first light to pass through the first grating layer; A second grating layer is disposed under the first backlight unit. The second grating layer includes a plurality of second light-transmitting portions, and each of the second light-transmitting portions extends along a second direction, and the second direction The first direction is substantially vertical; and A second backlight unit is disposed under the second grating layer, and the second backlight unit is used for providing a second light to pass through the second grating layer. A backlight module, including: A first grating layer including a plurality of first light-transmitting parts, each of the first light-transmitting parts extends along a first direction; A second grating layer is disposed under the first grating layer. The second grating layer includes a plurality of second light-transmitting parts. Each of the second light-transmitting parts extends along a second direction, and the second direction is The first direction is substantially vertical; A first backlight unit, including: A first light guide plate 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 is located on one side of the first light guide plate, and the first light source is used to provide a first light to pass through the first guide The light plate is projected toward the first grating layer and is transmitted through at least one of the first light-transmitting parts; and A second backlight unit is disposed under the second grating layer, and the second backlight unit is used for providing a second light to pass through the second grating layer. A backlight module, including: A first grating layer including a plurality of first light-transmitting parts, each of the first light-transmitting parts extends along a first direction; A second grating layer is disposed under the first grating layer. The second grating layer includes a plurality of second light-transmitting parts. Each of the second light-transmitting parts extends along a second direction, and the second direction is The first direction is substantially vertical; A first backlight unit, including: A first light guide plate disposed between the first grating layer and the second grating layer; and A first light source extends along 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. The first light source is used to provide a first light to pass through the first light guide. The light plate is projected toward the first grating layer and is transmitted through at least one of the first light-transmitting parts; and A second backlight unit is disposed under the second grating layer, and the second backlight unit is used for providing a second light to pass through the second grating layer. The backlight module according to any one of claims 1 to 3, wherein the first grating layer and the second grating layer are respectively louver ink films. The backlight module according to any one of claims 1-3, wherein the first backlight unit further comprises: A 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 concentrating structures, and the first light concentrating structures are formed on On the surface, an extension direction of each of the first light-concentrating structures is substantially parallel to the first direction. The backlight module according to claim 5, wherein the first light-concentrating structures of the first brightness enhancement film are protruding strip-shaped microstructures and face the first grating layer. The backlight module according to any one of claims 1-3, wherein the second backlight unit includes: An optical plate including a bottom surface and at least one side edge, the bottom surface is connected to the side edge; and A second light source is arranged on the bottom surface or the side of the optical plate, and the second light source is used to provide the second light. The backlight module according to claim 7, wherein the second backlight unit further includes: A 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, and the second light-concentrating structures are formed on the surface , An extension direction of each second light-concentrating structure is substantially parallel to the second direction. The backlight module according to claim 8, wherein the second light-concentrating structures of the second brightness enhancement film are protruding strip-shaped microstructures and face the second grating layer. The backlight module according to claim 7, wherein the first backlight unit further includes a first brightness enhancement film disposed between the first grating layer and the first light guide plate, and the second backlight unit further includes a The second brightness enhancement film is arranged between the second grating layer and the optical plate, the first brightness enhancement film includes a plurality of first light concentrating structures, and the second brightness enhancement film includes a plurality of second light concentrating structures, The extending direction of each of the first light concentrating structures is substantially perpendicular to the extending direction of each of the second light concentrating structures. A viewing angle adjustment method of a display, the display comprising a display panel and a backlight module as described in claim 1 or 2, the viewing angle adjustment method of the display can optionally execute a first wide viewing angle sharing mode and a privacy mode, The viewing angle adjustment methods of the display include: When executing the first wide viewing angle sharing mode to the display panel, the first backlight unit is controlled so that the first light provided by the first light source is parallel to the first direction through the first light guide plate The side edge of enters the first light guide plate, and the second backlight unit is controlled to not provide the second light; and When the privacy mode is executed for the display panel, the first backlight unit is controlled to not provide the first light, and the second backlight unit is controlled to provide the second light. The viewing angle adjustment method of the display according to claim 11, further comprising optionally executing a second wide viewing angle sharing mode, wherein when executing the second wide viewing angle sharing mode to 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 first light guide plate Two rays. A viewing angle adjustment method of a display, the display comprising a display panel and a backlight module as described in claim 1 or 3. The viewing angle adjustment method of the display can selectively execute a first off-angle sharing mode and a privacy mode , The viewing angle adjustment methods of this display include: When the first viewing angle sharing mode is performed to the display panel, the first backlight unit is controlled so that the first light provided by the first light source is parallel to the second direction through the first light guide plate The side edge of enters the first light guide plate, and the second backlight unit is controlled to not provide the second light; and When the privacy mode is executed for the display panel, the first backlight unit is controlled to not provide the first light, and the second backlight unit is controlled to provide the second light. The viewing angle adjustment method of the display according to claim 13, further comprising optionally executing a second angular viewing angle sharing mode, wherein when executing the second angular viewing angle sharing mode to 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 first light guide plate Two rays.

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