Backlight module, display device and display method thereof

Abstract

The invention discloses a backlight module, display equipment and a display method thereof. The backlight module comprises a light guide plate, a first backlight source and a second backlight source, wherein the first backlight source and the second backlight source are respectively arranged on light incident surfaces on two opposite sides of the light guide plate; the light guide plate comprises a body and a plurality of triangular prism structures, the body comprises a light-emitting face and a back face which are oppositely arranged, the triangular prism structures are located on the back face, the extending direction of the triangular prism structures is parallel to the light-emitting face, the bottom face of each triangular prism structure is an obtuse triangle, and the opposite sides of the obtuse angles in the obtuse triangles are located in the back face. Therefore, the triangular prism structure is arranged on the light guide plate, and the bottom surface of the triangular prism structure is in the obtuse triangle shape, so that light rays of the first backlight source and the second backlight source are emitted to the two sides respectively, and backlight on the two sides is provided for the display equipment when the backlight module is arranged in the display equipment; therefore, the backlights on the two sides can be respectively controlled by respectively controlling the switches of the two backlights so as to realize peep-proof display.

Description

[0001] This application claims the priority of the Chinese patent application filed with the Intellectual Property Office of the People's Republic of China on March 5, 2024, with application number PCT / CN2024 / 080152 and invention name "Display panel and driving method, display device, vehicle-mounted system and driving method", all contents of which are incorporated by reference in this application. Technical Field

[0002] The present invention relates to the field of backlight technology, and in particular to a backlight module, a display device and a display method thereof. Background Art

[0003] With the development of technology, display devices have become an indispensable part of people's daily life. When users use display devices, if the content displayed on the display devices is the user's privacy, it is necessary to prevent the content on the display devices from being seen by people around them in order to protect the user's privacy.

[0004] Therefore, how to realize anti-peeping display of display devices has become a technical problem to be solved urgently in this field. Summary of the invention

[0005] The embodiment of the present invention provides a backlight module, a display device and a display method thereof, which are used to realize anti-peeping display of the display device.

[0006] In a first aspect, an embodiment of the present invention provides a backlight module, comprising: a light guide plate, a first backlight source, and a second backlight source; wherein the first backlight source and the second backlight source are respectively arranged at light incident surfaces on opposite sides of the light guide plate;

[0007] The light guide plate includes a main body and a plurality of triangular prism structures, the main body includes a light emitting surface and a back surface that are relatively arranged, each of the triangular prism structures is located on the back surface, and the extension direction of each of the triangular prism structures is parallel to the light incident surface, the bottom surface of the triangular prism structure is an obtuse triangle, and the opposite side of the obtuse angle in the obtuse triangle is located inside the back surface.

[0008] In a second aspect, an embodiment of the present invention provides a display device, comprising: a backlight module, a display panel and a controller as described in the first aspect above.

[0009] In a third aspect, an embodiment of the present invention provides a display method of a display device as described in the second aspect above, comprising:

[0010] The controller confirms the current display mode;

[0011] When the display mode is a sharing mode: the controller controls the display panel to display a shared image, and the controller controls the first backlight source and the second backlight source to turn on;

[0012] When the display mode is the anti-peeping mode: the controller controls the display panel to display an anti-peeping picture, and the controller controls one of the first backlight source and the second backlight source to turn on.

[0013] The beneficial effects of the present invention are as follows:

[0014] A backlight module, a display device and a display method thereof provided by an embodiment of the present invention include: a light guide plate, a first backlight source and a second backlight source; wherein the first backlight source and the second backlight source are respectively arranged at the light incident surfaces on opposite sides of the light guide plate; the light guide plate includes a body and a plurality of triangular prism structures, the body includes a light emitting surface and a back surface arranged oppositely, each triangular prism structure is located at the back surface, and the extension direction of each triangular prism structure is parallel to the light incident surface, the bottom surface of the triangular prism structure is an obtuse triangle, and the opposite side of the obtuse angle in the obtuse triangle is located inside the back surface. In this way, by arranging the triangular prism structure on the light guide plate, and the bottom surface of the triangular prism structure is an obtuse triangle, the light of the first backlight source and the second backlight source is respectively emitted to the two sides, thereby providing the display device with backlight on both sides when the backlight module is arranged in the display device, and then the backlight on both sides can be respectively controlled by controlling the switches of the two backlight sources respectively, so as to realize anti-peeping display. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a backlight module provided in an embodiment of the present invention;

[0016] Figure 2 A schematic structural diagram of a triangular prism structure in a light guide plate provided in an embodiment of the present invention;

[0017] Figure 3 A schematic diagram of a light path in a light guide plate provided in an embodiment of the present invention;

[0018] Figure 4 A schematic diagram of the structure of another backlight module provided in an embodiment of the present invention;

[0019] Figure 5 A schematic diagram of a prism sheet provided in an embodiment of the present invention converging light;

[0020] Figure 6 It is a simulation diagram of illumination at various viewing angles when the first backlight source and the second backlight source provided in the embodiment of the present invention are both turned on;

[0021] Figure 7 A curve showing the relationship between brightness and viewing angle when both the first backlight source and the second backlight source provided in the embodiment of the present invention are turned on;

[0022] Figure 8 It is a simulation diagram of illumination at various viewing angles when only the first backlight source or the second backlight source is turned on provided in an embodiment of the present invention;

[0023] Fig. 9 A curve showing the relationship between brightness and viewing angle when only the first backlight source or the second backlight source is turned on in an embodiment of the present invention;

[0024] Fig.10 It is a simulation diagram of the illumination distribution of the light emitting surface of the light guide plate when different structures are provided in the embodiments of the present invention;

[0025] Fig.11 A schematic diagram of the structure of a display device provided in an embodiment of the present invention;

[0026] Fig.12 A flow chart of a display method provided in an embodiment of the present invention;

[0027] Fig.13 A timing relationship diagram of an anti-peeping display provided in an embodiment of the present invention;

[0028] Fig.14 A timing relationship diagram of another anti-peeping display provided in an embodiment of the present invention;

[0029] Fig.15 A timing relationship diagram of a dual-view display provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings to describe in detail the specific implementation of a backlight module, a display device and a display method provided by an embodiment of the present invention. It should be noted that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] The embodiment of the present invention provides a backlight module, such as Figure 1 As shown, it includes: a light guide plate 100, a first backlight source 201 and a second backlight source 202; wherein the first backlight source 201 and the second backlight source 202 are respectively arranged at the light incident surfaces on opposite sides of the light guide plate 100, as shown in FIG. Figure 1 A first backlight source 201 is disposed on one side of the first light incident surface R1, and a second backlight source 202 is disposed on one side of the second light incident surface R2;

[0032] The light guide plate 100 includes a body 101 and a plurality of triangular prism structures 102. The body 101 includes a light emitting surface C and a back surface (i.e. Figure 1 The lower surface of the middle body 101, Figure 1(not shown), each triangular prism structure 102 is located on the back, and the extension direction of each triangular prism structure 102 is parallel to the light incident surface R, the bottom surface of the triangular prism structure 102 is an obtuse triangle, and the opposite side of the obtuse angle in the obtuse triangle is located inside the back. Figure 1 (b) is Figure 1 The backlight module shown in (a) is viewed from the side away from the light emitting surface C. Figure 1 The dot-dash line in (b) indicates the edge of the triangular prism structure 102 protruding from the body 101 .

[0033] In this way, by setting a triangular prism structure on the light guide plate, and the bottom surface of the triangular prism structure is an obtuse triangle, the light from the first backlight source and the second backlight source is respectively directed to the two sides, so that when the backlight module is set in the display device, it can provide the display device with backlight directed to both sides, and then the backlight directed to both sides can be controlled separately by controlling the switches of the two backlight sources separately to achieve anti-peeping display.

[0034] Among them, Figure 2 As shown, Figure 2 is a schematic diagram of a single triangular prism structure. Figure 2 It can be seen that the bottom surface of the triangular prism structure is an obtuse triangle, which includes an obtuse angle A and a side a opposite to the obtuse angle A, and the side a opposite to the obtuse angle A is located within the surface shown in M. The surface shown in M ​​is the triangular prism structure and the back surface ( Figure 2 It should be understood that in the light guide plate, the body and the triangular prism structure are an integrated structure. For example, the triangular prism structure can be formed by epitaxial growth directly on the back of the body, or by etching on one side of the substrate, and the substrate outside the triangular prism structure forms the body. Therefore, in the light guide plate, the side a opposite to the obtuse angle A and the surface shown in M ​​may not be directly observed. Figure 2 In this way, by setting a triangular prism structure in the light guide plate, anti-peeping display can be achieved, the structure is simple, and no additional structure is required, making the backlight module thinner and lighter, thereby increasing the application range of the display device.

[0035] In addition, if Figure 3As shown, when the bottom surface of the triangular prism structure in the light guide plate 100 is an obtuse angle, the light incident from the first light incident surface R1 on the left is emitted to the right, and the light incident from the second light incident surface R2 on the right is emitted to the left. In this way, when the backlight module is set in the display device to provide backlight for the display device, and the light generated by the first backlight source is incident from the first light incident surface R1, and the light generated by the second backlight source is incident from the second light incident surface R2, the light generated by the first backlight source can provide backlight for the right side, and the light generated by the second backlight source can provide backlight for the left side. Therefore, when the first backlight source is turned on and the second backlight source is turned off, there is backlight on the right side and no backlight on the left side, and the observer on the left side will not be able to observe the picture displayed by the display device, thereby realizing anti-peeping display; similarly, when the first backlight source is turned off and the second backlight source is turned on, there is no backlight on the right side and there is backlight on the left side, and the observer on the right side will not be able to observe the picture displayed by the display device, thereby realizing anti-peeping display; when both the first backlight source and the second backlight source are turned on, the anti-peeping display of the display device can be turned off.

[0036] Optionally, the obtuse triangle is an isosceles obtuse triangle. In this way, light incident from the light incident surface can be emitted evenly to both sides, improving the uniformity of backlight on both sides, so that when the backlight module is applied to a display device, the display effect of the display device can be improved.

[0037] Furthermore, if Figure 2 As shown, the base angle B of the isosceles obtuse triangle is not less than 1° and not more than 15°. In this way, the range of the optimal viewing area of ​​the display device can be controlled by setting the angle range of the base angle B. For example, when the viewing angle of the optimal viewing area required by the display device along the direction perpendicular to the extension of the triangular prism structure is large, the angle of the base angle B can be set to a larger value, so as to provide sufficient backlight for the optimal viewing area and achieve a better display effect at the optimal viewing area. Similarly, when the viewing angle of the optimal viewing area required by the display device along the direction perpendicular to the extension of the triangular prism structure is small, the angle of the base angle B can be set to a smaller value to achieve a better display effect at the optimal viewing area. Of course, the specific angle of the base angle B can be set according to actual needs and is not specifically limited here. It should be understood that the above-mentioned "viewing angle size" can be understood as: taking the direction perpendicular to the screen of the display device as the reference direction, the angle deviating from the reference direction is the viewing angle size.

[0038] In addition, if Figure 2 As shown, the base of the isosceles obtuse triangle is not less than 0.1mm and not more than 0.5mm, that is, the length L of the opposite side a of the obtuse angle A is not less than 0.1mm and not more than 0.5mm. In this way, it can avoid the base being too short, which will lead to excessive processing difficulty and reduce costs, and it can also avoid the base being too long, which will lead to the triangular prism structure being too large in size and reduce the thickness of the light guide plate.

[0039] Of course, in addition to the triangular prism structure, the light guide plate may also be provided with the following other structures.

[0040] Optionally, the light emitting surface is provided with a plurality of pits. Thus, by providing the pits, the uniformity of light emitted from the light emitting surface can be improved, thereby improving the backlight effect of the backlight module.

[0041] Furthermore, the diameter of the pit is not less than 0.2 mm and not more than 0.3 mm; and / or, the depth of the pit is not less than 0.01 mm and not more than 0.05 mm. In this way, by optimizing the parameters of the pits through software, the uniformity of the brightness of the light-emitting surface of the light guide plate can reach more than 85%. It should be understood that the calculation method of the uniformity of the brightness of the above-mentioned light-emitting surface is: the ratio of the lowest value of the brightness of the light-emitting surface to the highest value of the brightness of the light-emitting surface, multiplied by 100%.

[0042] In addition, the distribution of the pits on the light emitting surface can be obtained by methods well known to those skilled in the art, such as software optimization. Of course, the specific distribution of the pits can be set according to actual needs and is not limited here.

[0043] Optionally, prism microstructures may be provided at the two light incident surfaces of the light guide plate, and the specific arrangement form of the prism microstructures may be a form familiar to those skilled in the art. Thus, by providing prism microstructures on the light incident surfaces, the light incident on the light guide plate is made more uniform, and the shadow of the backlight source can be reduced, thereby improving the backlight effect of the backlight module.

[0044] Furthermore, if Figure 4 As shown, the backlight module further includes: a prism sheet 500 disposed on one side of the light emitting surface, and the extending direction of the prisms in the prism sheet 500 is perpendicular to the extending direction of the triangular prism structure.

[0045] In this way, the prism sheet can increase the brightness in the direction perpendicular to the prism sheet, thereby increasing the front brightness of the display device and improving the display effect of the display device; in addition, the extension direction of the prism in the prism sheet is perpendicular to the extension direction of the triangular prism structure, so that the light reflected to both sides by the triangular prism structure will not be converged by the prism sheet, thereby ensuring that the anti-peeping display can be realized normally.

[0046] It should be understood that the prism sheet can converge light rays diverging in a specific direction, which can be understood as follows: Figure 5As shown, x, y, and z are the coordinate axes of the plane rectangular coordinate system, wherein the direction indicated by the x-axis is the extension direction of the prism in the prism sheet, the direction indicated by the y-axis is the extension direction of the triangular prism structure, and the direction indicated by the z-axis points to the display panel. The dotted arrow represents the light, and the light ray p is located in the yz plane, and the light ray q is located in the xz plane. At this time, the prism sheet can converge the light rays in the yz plane and in the plane parallel to the yz plane, so that these light rays converge in the direction parallel to the direction indicated by the z, so that the light ray p can be converged by the prism sheet and deviate to the direction indicated by the z; and since the light ray q is located in the xz plane, it cannot be converged by the prism sheet, and the light ray q can be regarded as the light reflected to both sides by the triangular prism structure, thereby ensuring the realization of the anti-peeping function.

[0047] Of course, the extension direction of the prism in the prism sheet and the extension direction of the triangular prism structure can also be perpendicular to each other within a certain error range, so that the light reflected to both sides by the triangular prism structure will not be completely converged by the prism sheet. The specific error range can be set according to actual needs. For example, when the anti-peeping display requirements are high, the error range can be set smaller to improve the anti-peeping display effect. When the anti-peeping display requirements are low, the error range can be set larger to reduce the process difficulty. The specific error range is not limited here.

[0048] Alternatively, if Figure 4 As shown, the backlight module further includes: a reflective sheet 300 disposed on the side of the light guide plate 100 away from the light emitting surface. Thus, by providing the reflective sheet 300, when the light in the light guide plate 100 is emitted to the reflective sheet 300, the reflective sheet 300 can reflect the light back into the light guide plate 100, thereby reducing the loss of backlight and improving the backlight effect of the backlight module.

[0049] Alternatively, if Figure 4 As shown, the backlight module further includes: a diffuser 400 and a light-enhancing film 600 which are sequentially stacked on one side of the light-emitting surface of the light guide plate 100. Wherein, when the backlight module is provided with a prism sheet 500, the prism sheet 500 is located between the diffuser 400 and the light-enhancing film 600. In this way, by providing the diffuser 400, the diffuser material in the diffuser 400 refracts and reflects the light emitted from the light-emitting surface, thereby atomizing the light and improving the backlight uniformity of the backlight module; by providing the light-enhancing film 600, the P light and the S light in the light emitted by the backlight source can be output as backlight to the display panel, thereby improving the backlight brightness of the backlight module and improving the backlight effect.

[0050] In addition, the backlight module may further include a frame. The reflective sheet, the first backlight source, the second backlight source, the light guide plate, the diffusion sheet, the prism sheet and the light enhancement film may be arranged in the frame. Thus, by arranging the frame, the structure of the backlight module is more stable, and the reliability of the backlight module is improved.

[0051] The backlight module provided by the embodiment of the present invention is explained below in conjunction with specific simulation results.

[0052] like Figure 6 As shown, Figure 6 It is a simulation diagram of the illumination at each viewing angle when both the first backlight source and the second backlight source are turned on. Figure 6 The illuminance at the intersection of the middle straight line X and the straight line Y indicates the illuminance when the viewing angle is the normal line of the light-emitting surface. From the intersection along the straight line X, the viewing angle gradually deviates from the normal line of the light-emitting surface until it is perpendicular to the normal line of the light-emitting surface. Figure 6 The positions at 90° and -90° on the center line X are the illumination when the viewing angle is perpendicular to the normal line of the light-emitting surface. Figure 6 It can be seen that the left and right sides of straight line Y include areas with higher illumination. The area on the left side of straight line Y can be called the left viewing area, and the area on the right side of straight line Y can be called the right viewing area. Therefore, when a triangular prism structure is provided, in the left and right viewing areas, an area with higher illumination will appear at a certain angle deviating from the normal direction of the light emitting surface, which provides conditions for realizing anti-peeping display.

[0053] Furthermore, since the illumination in the left and right viewing areas is relatively high, the backlight module is suitable for display devices that are viewed from both sides, such as vehicle-mounted display devices. When the backlight module is applied to vehicle-mounted display devices, the main driving position and the co-pilot position can achieve relatively high illumination, thereby improving the user experience. Of course, in addition to vehicle-mounted display devices, the backlight module can also be used in other display devices, which is not specifically limited here.

[0054] like Figure 7 As shown, Figure 7 For along Figure 6 The relationship between brightness and viewing angle is shown in the figure below. Figure 7 It can be seen that the brightness is higher when the viewing angle deviates from the normal line of the light-emitting surface at a certain angle on both sides. In the left viewing area, the brightness is higher when the viewing angle is between -20° and -70°, reaching more than 4000nit. In the right viewing area, the brightness is higher when the viewing angle is between 20° and 70°, also reaching more than 4000nit. The highest brightness at each viewing angle can reach 6000nit. In this way, when a triangular prism structure is provided, a higher brightness can be achieved at some viewing angles in the left and right viewing areas, thereby ensuring the realization of the backlight function of the backlight module and providing conditions for realizing anti-peeping display.

[0055] like Figure 8 As shown, Figure 8 It is a simulation diagram of the illumination at each viewing angle when the first backlight source and the second backlight source are turned on respectively. Figure 8 (a) can be considered as a simulation diagram of the illumination at each viewing angle when the second backlight source (or the first backlight source) is turned on. Figure 8(b) can be considered as a simulation diagram of the illumination at each viewing angle when the first backlight source (or the second backlight source) is turned on, such as Figure 8 (a) and Figure 8 As shown in (b), when only the first backlight source or the second backlight source is turned on, only one side of the left viewing area and the right viewing area has a high illumination, while the illumination of the other side is relatively low. Figure 8 In (a), the illumination in the left viewing area is higher, while the illumination in the right viewing area is lower. Figure 8 In (b), the right viewing area has a higher illuminance, while the left viewing area has a lower illuminance. Thus, when only the second backlight source (or the first backlight source) is turned on, the left viewing area can have a higher luminance, and when only the first backlight source (or the second backlight source) is turned on, the right viewing area can have a higher luminance, thereby achieving anti-peeping display.

[0056] like Fig. 9 As shown, Fig. 9 For along Figure 8 The relationship curve between brightness and viewing angle when the middle straight line X is shown. Fig. 9 The middle curve 1 is along Figure 8 The brightness distribution diagram of the straight line X at different viewing angles in (a). Fig. 9 The middle curve 2 is along Figure 8 Brightness distribution diagram of the straight line X at different viewing angles in (b). Taking the simulation of turning off the first backlight source and turning on the second backlight source to obtain curve 1, and turning on the first backlight source and turning off the second backlight source to obtain curve 2 as an example, when the first backlight source is turned on and the second backlight source is turned off, the brightness of the left viewing area can reach 4500nit, while the brightness of the right viewing area can only reach 1500nit, so that the right viewing area can be protected from peeping. When the second backlight source is turned on and the first backlight source is turned off, the brightness of the right viewing area can reach 4500nit, while the brightness of the left viewing area can only reach 1500nit, so that the left viewing area can be protected from peeping, and thus anti-peeping display can be achieved by controlling the first backlight source and the second backlight source. Of course, the situation when the first backlight source is turned off and the second backlight source is turned on to obtain curve 2, and the situation when the first backlight source is turned on and the second backlight source is turned off to obtain curve 1 is similar to this, and anti-peeping display can also be achieved, which will not be described in detail here.

[0057] like Fig.10 As shown, Fig.10 (a) is a simulation diagram of the illumination distribution of the light-emitting surface when the light guide plate is not provided with a triangular prism structure and a pit. Fig.10 (b) is a simulation diagram of the illumination distribution of the light-emitting surface when the light guide plate is provided with a triangular prism structure but without a pit. Fig.10 (c) is a simulation diagram of the illumination distribution on the light-emitting surface when the light guide plate is provided with a triangular prism structure and pits. Fig.10In (a) and (b), it can be seen that the triangular prism structure can improve the uniformity of the illumination surface of the light guide plate to a certain extent, but the uniformity of the illumination surface of the light guide plate is still not high. Further, Fig.10 As shown in (c), after the light emitting surface of the light guide plate is provided with pits, the uniformity of the illumination surface of the light guide plate is greatly improved.

[0058] Based on the same inventive concept, an embodiment of the present invention provides a display device, such as Fig.11 As shown, it includes: a backlight module 1101, a display panel 1102 and a controller 1103 as described above.

[0059] The controller is used to control the switching of the first backlight source and the second backlight source, and control the picture displayed on the display panel. In this way, by setting the controller, when the controller controls the display panel to display a picture, the backlights on both sides can be controlled by controlling the switching of the first backlight source and the second backlight source, and then anti-peeping display can be achieved when one side of the backlight is turned off.

[0060] Optionally, the controller may adopt devices such as FPGA (Field Programmable Gate Array), CPLD (Complex Programmable Logic Device), MCU (Micro Control Unit), etc. Of course, the controller may also adopt other devices that are well known to those skilled in the art and can realize the functions of the controller, and no specific limitation is made here.

[0061] Based on the same inventive concept, an embodiment of the present invention provides a display method of a display device as described above, such as Fig.12 As shown, including:

[0062] S1201, the controller confirms the current display mode;

[0063] S1202, when the display mode is the sharing mode: the controller controls the display panel to display the shared image, and the controller controls the first backlight source and the second backlight source to turn on;

[0064] S1203: When the display mode is the anti-peeping mode: the controller controls the display panel to display the anti-peeping picture, and the controller controls one of the first backlight source and the second backlight source to turn on.

[0065] The display mode can be determined by the user or by the display device according to the display screen. In this way, under the control of the controller, the display device can switch between the sharing mode and the anti-peeping mode, thereby improving the comfort and convenience of use.

[0066] Of course, for the screen displayed by the display device, a screen can be either a shared screen or an anti-peeping screen, which depends on the current display mode. That is, when the display device displays a certain screen, if it is currently in a shared mode, the screen is a shared screen; if it is currently in an anti-peeping mode, the screen is an anti-peeping screen. In this way, the user can easily switch the display mode, which improves the convenience of use.

[0067] Optionally, when the display mode is the anti-peeping mode, the display method further includes: when the controller controls the display panel to display a completely black screen, the controller controls the first backlight source and the second backlight source to turn off; wherein the display frame of the anti-peeping screen and the display frame of the completely black screen are arranged alternately.

[0068] The interlaced arrangement of the display frames of the anti-peeping screen and the display frames of the all-black screen can be set as follows: odd-numbered frames are anti-peeping screens, and even-numbered frames are all-black screens; or odd-numbered frames are all-black screens, and even-numbered frames are anti-peeping screens. In this way, by setting an all-black screen, the brightness of the side without backlight is further reduced, which can improve the anti-peeping effect and the reliability of the anti-peeping display of the display device.

[0069] Of course, the proportion of the anti-peeping screen can also be increased. For example, it can be set to include two, three, four or more anti-peeping frames between two adjacent frames of all-black screens. This can improve the display effect of the anti-peeping screen. The proportion of the all-black screen can also be increased. For example, it can be set to include two, three, four or more all-black frames between two adjacent frames of anti-peeping screens. This can further improve the anti-peeping effect. The ratio of the display frames of the anti-peeping screen and the display frames of the all-black screen can be set according to actual needs and is not limited here.

[0070] Optionally, the display method further includes: when the display mode is a dual-view mode: when the controller controls the display panel to display the first picture, the controller controls the first backlight source to turn on, and controls the second backlight source to turn off; when the controller controls the display panel to display the second picture, the controller controls the second backlight source to turn on, and controls the first backlight source to turn off; wherein the display frame of the first picture and the display frame of the second picture are arranged alternately. Similarly, the ratio of the display frame of the first picture and the display frame of the second picture can be set according to actual needs and is not limited here.

[0071] Thus, when the display device is in dual-view mode, under the control of the controller, through changes in the display image and switching of two backlight sources, the user of the display device can see different display images from the left viewing area and the right viewing area, thereby achieving dual-view display.

[0072] It should be understood that when setting a full black screen to achieve anti-peeping display, or to achieve dual-view display, the frame rate of the picture seen from the left viewing area or the right viewing area will be lower than the frame rate of the display panel. Therefore, when setting a full black screen to achieve anti-peeping display, or to achieve dual-view display, in order to improve the user experience, the frame rate of the display panel can be set higher. For example, the frame rate of the display panel can be set to 480Hz. When the odd frames are the first picture and the even frames are the second picture, the frame rate of the pictures seen in the left viewing area and the right viewing area are both 240Hz. When the picture frame rate is 240Hz, the human eye cannot perceive the switching of the image, and what is seen is still a smooth picture. Of course, the frame rate of the display panel can also be set to other values ​​that improve the user experience, which is not specifically limited here.

[0073] In addition, the display modes that can be implemented by the display device may include, but are not limited to: a part or all of a sharing mode, an anti-peeping mode, and a dual-view mode.

[0074] The display method provided by the embodiment of the present invention is explained below by taking an example in which the first backlight source provides backlight for the right viewing area and the second backlight source provides backlight for the left viewing area.

[0075] 1. The anti-peeping display of the completely black screen is not set.

[0076] like Fig.13 As shown, each frame displayed by the display panel is an anti-peeping picture, the first backlight source is at a high level in each frame, that is, it is turned on, and the second backlight source is at a low level in each frame, that is, it is turned off. In the display process of the display device, the first backlight source can always provide backlight for the right viewing area, so the right viewing area can watch the anti-peeping picture, while the second backlight source cannot provide backlight for the left viewing area, so the left viewing area cannot watch the anti-peeping picture, thereby realizing the anti-peeping display of the display device.

[0077] Similarly, it is also possible to realize an anti-peeping display in which the left viewing area can view the anti-peeping picture, while the right viewing area cannot view the anti-peeping picture, which will not be described in detail here.

[0078] 2. Set up an anti-peeping display with a completely black screen.

[0079] like Fig.14As shown, the display panel displays an anti-peeping picture in odd frames, and displays a completely black picture in even frames. The first backlight source is at a high level in odd frames, i.e., it is turned on, and the first backlight source is at a low level in even frames, i.e., it is turned off. The second backlight source is at a low level in each frame, i.e., it is turned off. Furthermore, during the display process of the display device, the first backlight source can provide backlight for the right viewing area in odd frames, but not in even frames. Therefore, the right viewing area can watch the anti-peeping picture, and the frame rate of the anti-peeping picture is half of the display frame rate of the display panel. The second backlight source cannot provide backlight for the left viewing area, so the left viewing area cannot watch the anti-peeping picture, thereby realizing the anti-peeping display of the display device. Moreover, since the even frames are completely black, the brightness of the left viewing area is further reduced, thereby improving the effect of the anti-peeping display.

[0080] Similarly, this method can also realize the anti-peeping display in which the left viewing area can view the anti-peeping picture, while the right viewing area cannot view the anti-peeping picture, which will not be described in detail here.

[0081] 3. Dual-view display.

[0082] like Fig.15 As shown, the display panel displays the first picture in the odd frame, and the display panel displays the second picture in the even frame. The first backlight source is at a high level in the odd frame, that is, it is turned on, and the first backlight source is at a low level in the even frame, that is, it is turned off. The second backlight source is at a low level in the odd frame, that is, it is turned off, and the second backlight source is at a high level in the even frame, that is, it is turned on. Furthermore, during the display process of the display device, the first backlight source can provide backlight for the right viewing area in the odd frame, and does not provide backlight in the even frame, so the right viewing area can watch the first picture, and the frame rate of the first picture is half of the display frame rate of the display panel; the second backlight source can provide backlight for the left viewing area in the even frame, and does not provide backlight in the odd frame, so the left viewing area can watch the second picture, and the frame rate of the second picture is half of the display frame rate of the display panel. In this way, the display device realizes the display effect of the right viewing area watching the first picture and the left viewing area watching the second picture, that is, dual-view display is realized.

[0083] Similarly, this method can also realize dual-view display in which the left viewing area can watch the first picture, and the right viewing area can watch the second picture, which will not be described in detail here.

[0084] In addition, when the display device is in sharing mode, each frame of the display panel is a shared picture, and the first backlight source and the second backlight source are at a high level in each frame, that is, they are turned on, thereby realizing a sharing mode in which both the left viewing area and the right viewing area can view the shared picture.

[0085] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A backlight module, characterized in that: include: A light guide plate, a first backlight source and a second backlight source; wherein the first backlight source and the second backlight source are respectively arranged at light incident surfaces on opposite sides of the light guide plate; The light guide plate includes a main body and a plurality of triangular prism structures, the main body includes a light emitting surface and a back surface that are relatively arranged, each of the triangular prism structures is located on the back surface, and the extension direction of each of the triangular prism structures is parallel to the light incident surface, the bottom surface of the triangular prism structure is an obtuse triangle, and the opposite side of the obtuse angle in the obtuse triangle is located inside the back surface.

2. The backlight module according to claim 1, characterized in that: The backlight module further includes a prism sheet disposed on one side of the light emitting surface, and an extending direction of the prisms in the prism sheet is perpendicular to an extending direction of the triangular prism structure.

3. The backlight module according to claim 1, wherein: The light emitting surface is provided with a plurality of pits.

4. The backlight module according to claim 3, characterized in that: The diameter of the pit is not less than 0.2 mm and not more than 0.3 mm; And / or, the depth of the pit is not less than 0.01 mm and not more than 0.05 mm.

5. The backlight module according to any one of claims 1 to 4, characterized in that: The obtuse triangle is an isosceles obtuse triangle.

6. The backlight module according to claim 5, characterized in that: The base angle of the isosceles obtuse triangle is not less than 1° and not more than 15°.

7. The backlight module according to claim 5, characterized in that: The base of the isosceles obtuse triangle is not less than 0.1 mm and not more than 0.5 mm.

8. A display device, characterized in that: include: A backlight module, a display panel and a controller as described in any one of claims 1 to 7.

9. A display method of a display device as claimed in claim 8, characterized in that: include: The controller confirms the current display mode; When the display mode is a sharing mode: the controller controls the display panel to display a shared image, and the controller controls the first backlight source and the second backlight source to turn on; When the display mode is the anti-peeping mode: the controller controls the display panel to display an anti-peeping picture, and the controller controls one of the first backlight source and the second backlight source to turn on.

10. The display method according to claim 9, characterized in that: When the display mode is an anti-peeping mode, the display method further includes: When the controller controls the display panel to display a completely black picture, the controller controls the first backlight source and the second backlight source to be turned off; The display frames of the anti-peeping screen and the display frames of the full black screen are arranged alternately.

11. The display method according to claim 9 or 10, characterized in that: Also includes: When the display mode is the dual-view mode: When the controller controls the display panel to display a first picture, the controller controls the first backlight source to turn on, and controls the second backlight source to turn off; when the controller controls the display panel to display a second picture, the controller controls the second backlight source to turn on, and controls the first backlight source to turn off; The display frames of the first picture and the display frames of the second picture are arranged alternately.

Images