Dual-sided display device and method of driving the same

Abstract

The application discloses a double-sided display device and a driving method thereof. The double-sided display device comprises a display panel and a backlight module. The backlight module comprises a lamp plate and a plurality of lamp beads arranged on the lamp plate. The double-sided display device further comprises a plurality of micro-rotating devices arranged on the light-emitting surface of the lamp beads. The micro-rotating device comprises a transmission area and a reflection area. The micro-rotating device changes the positions of the transmission area and the reflection area by rotating. The lamp plate is transparent corresponding to the pixel display area of the display panel. When the transmission area of the micro-rotating device rotates to the directly above of the lamp bead, the light emitted by the lamp bead passes through the transmission area to form the front picture of the double-sided display device. When the reflection area of the micro-rotating device rotates to the directly above of the lamp bead, the light emitted by the lamp bead is reflected back by the reflection area to form the back picture of the double-sided display device. The application is arranged with the transmission area and the reflection area and the micro-rotating device on the light-emitting surface of the lamp bead. By controlling the position movement of the two areas, the double-sided display is realized.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a double-sided display device and a driving method thereof. Background Art

[0002] Currently, most display panels on the market are single-sided. In many situations, such as advertising facilities in public places such as digital signage, electronic communication equipment, cash registers, window information facilities, exhibition halls, etc., two people are often required to view the displayed image from both sides of the display panel at the same time.

[0003] However, existing double-sided display panels are actually a combination of two independent display panels, and their internal structure and the drive system that drives the two independent display panels to emit light are relatively complex. Traditional TFT-LCD panels can display in a transmissive, reflective, or semi-transmissive manner, but are limited by edge-lit backlight technology, making it difficult to achieve dual-sided display on a single panel. Large-scale double-sided transparent displays also have significant yield limitations. Currently, to achieve the dual-sided display effect, many people stack two array substrates, but this structure is very complex and the resulting double-sided display structure is very thick. Summary of the Invention

[0004] The purpose of the present application is to provide a double-sided display device and a driving method thereof that have simple structure control, thin thickness, and do not lose original resolution.

[0005] The present application discloses a double-sided display device, comprising a display panel and a backlight module, wherein the backlight module comprises a lamp board and a plurality of lamp beads arranged on the lamp board; the double-sided display device further comprises a plurality of micro-rotating devices, wherein the micro-rotating devices are arranged on the light-emitting surfaces of the lamp beads; the micro-rotating devices comprise a transmission area and a reflection area, and the micro-rotating devices change the positions of the transmission area and the reflection area by rotation; wherein the area of ​​the lamp board corresponding to the pixel display area of ​​the display panel is transparent, and when the transmission area of ​​the micro-rotating device rotates to directly above the lamp beads, the light emitted by the lamp beads passes through the transmission area to form the front image of the double-sided display device, and when the reflection area of ​​the micro-rotating device rotates to directly above the lamp beads, the light emitted by the lamp beads is reflected back by the reflection area to form the back image of the double-sided display device.

[0006] Optionally, one of the micro-rotating devices is provided corresponding to one of the lamp beads, the areas of the transmission area and the reflection area are equal, and the area of ​​the transmission area or the reflection area is equal to the area of ​​a pixel display area; when the transmission area rotates to above the lamp bead, the brightness value of the lamp bead is L1, and when the reflection area rotates to above the lamp bead, the brightness value of the lamp bead is L2, wherein L1 is not equal to L2, and the front image and the back image are different images.

[0007] Optionally, the transmission area is provided with a transparent layer, and the reflection area is provided with a reflective layer, the transparent layer and the reflective layer form a circular structure, the transparent layer and the reflective layer are both fan-shaped, and within the circular structure, the sum of the central angles of the transparent layer is the same as the sum of the central angles of the reflective layer.

[0008] Optionally, each of the micro-rotating devices is arranged corresponding to at least two of the lamp beads, the areas of the transmission area and the reflection area are equal, and the area of ​​the transmission area or the reflection area is equal to the area of ​​a pixel display area; the transmission area and the reflection area include at least two fan-shaped areas, the transmission area is hollow, and a reflection layer is provided in the reflection area; when the transmission area rotates to above one of the lamp beads, the reflection area rotates to above the other lamp bead.

[0009] Optionally, the lamp beads include red LED lights, green LED lights and blue LED lights, and the number of the red LED lights, green LED lights and blue LED lights is the same. One red LED light, one green LED light and one blue LED light form a lamp group. Multiple lamp groups are provided on the lamp board. The reflectivities of the reflection areas of the micro-rotating device corresponding to the LED lights in each lamp group are different. The reflectivity of the reflection area of ​​the micro-rotating device corresponding to the blue LED light is greater than the reflectivity of the reflection area of ​​the micro-rotating device corresponding to the red LED light or the green LED light.

[0010] Optionally, the lamp beads are micro-LED lamps, each of the lamp beads is arranged corresponding to a pixel display area, the lamp beads are arranged in multiple rows and columns, four adjacent lamp beads form a lamp group, the lamp beads in each lamp group are arranged in 2*2, and each lamp group is provided with a micro-rotating device, the micro-rotating device is provided with two fan-shaped transmission areas and reflection areas, and the transmission areas and reflection areas are arranged at intervals, and the four lamp beads in each of the lamp groups are red LED lamp, green LED lamp, blue LED lamp and white LED lamp respectively.

[0011] Optionally, the micro-rotating device is rotated by a driving structure, the driving structure comprising a fixed rod and a driving wall, the fixed rod being fixed to the lamp board, the driving wall being sleeved on the fixed rod, and the driving wall being fixedly connected to the micro-rotating device on the side away from the light board; the driving wall is made of conductive material, and at least two driving electrodes are provided on both sides of the driving wall, of which one is located below the transmission area and the other is located below the reflection area; an electric field is generated between the two driving electrodes to cause the driving wall to rotate, thereby driving the micro-rotating device to rotate, and when the transmission area of ​​the micro-rotating device rotates to directly above the lamp bead, the double-sided display device displays the front image; when the reflection area of ​​the micro-rotating device rotates to directly above the lamp bead, the double-sided display device displays the back image.

[0012] Optionally, the double-sided display device includes a refresh rate adjustment module, which is electrically connected to the driving electrode. The refresh rate adjustment module controls the rotation speed of the micro-rotating device by outputting voltages of different sizes to the driving electrode, thereby changing the refresh rate of the front display or the back display of the double-sided display device.

[0013] The present application also discloses a driving method for a double-sided display device, which is used to drive any of the above-mentioned display devices. The driving method comprises the following steps:

[0014] Turning on the lamp beads on the backlight module to enable the lamp beads to emit light; and

[0015] Rotating the micro-rotating device changes the positions of the transmission area and the reflection area;

[0016] Among them, when the transmission area rotates to directly above the lamp bead, the light emitted by the lamp bead passes through the transmission area to form the front image of the double-sided display device. When the reflection area rotates to directly above the lamp bead, the light emitted by the lamp bead is reflected back by the reflection area to form the back image of the double-sided display device.

[0017] Optionally, the step of rotating the micro-rotating device to change the positions of the transmission area and the reflection area includes:

[0018] The refresh rate adjustment module is turned on to output different driving voltages to the driving electrodes of the micro-rotating device, thereby changing the rotation speed of the micro-rotating device to adjust the refresh rates of the front and back images of the double-sided display device.

[0019] Compared with the existing double-sided display device formed by stacking two display panels, the present application does not need to stack the two display panels, and directly arranges a micro-rotating device on the light-emitting surface of the lamp beads on the lamp board. The area of ​​the lamp board corresponding to the pixel display area of ​​the display panel is transparent, and the micro-rotating device includes a transmission area and a reflection area. The micro-rotating device changes the position of the transmission area and the reflection area by rotation; when the transmission area of ​​the micro-rotating device rotates to directly above the lamp beads, the double-sided display device displays the front image; when the reflection area of ​​the micro-rotating device rotates to directly above the lamp beads, the double-sided display device displays the back image. The micro-rotating device continuously rotates, so that both the front and back sides of the double-sided display device are backlit, so as to realize double-sided display of the double-sided display device without affecting the resolution of the original display device. Compared with the double-sided display device formed by stacking two display panels, the thickness and cost are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0021] Figure 1 is a structural schematic diagram of a double-sided display device according to a first embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the front display light path of the first embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of the back display light path of the first embodiment of the present application;

[0024] Figure 4 This is a schematic structural diagram of the back surface of the micro-rotation device according to the second embodiment of the present application;

[0025] Figure 5 This is a schematic structural diagram of the front display of the micro-rotation device of the second embodiment of the present application;

[0026] Figure 6 2 is a schematic structural diagram of a double-sided display device according to a third embodiment of the present application during front-side display;

[0027] Figure 7 is a structural perspective diagram of the double-sided display device of the third embodiment of the present application when displaying from the rear side;

[0028] Figure 8is a structure schematic diagram of a double-sided display device of a third embodiment of the present application;

[0029] Figure 9 is a structure schematic diagram of a backlight module of a fourth embodiment of the present application;

[0030] Figure 10 is a structure schematic diagram of a micro-rotating device of a fourth embodiment of the present application;

[0031] Figure 11 is a structure schematic diagram of a double-sided display device of a fourth embodiment of the present application;

[0032] Figure 12 is a flowchart of a driving method of a fifth embodiment of the present application.

[0033] Wherein, 10, double-sided display device; 100, backlight module; 110, lamp plate; 120, lamp bead; 130, micro-rotating device; 131, transmission area; 132, reflection area; 133, reflection layer; 134, transparent layer; 135, light shielding layer; 140, driving structure; 141, fixed rod; 142, driving wall; 150, driving electrode; 160, refresh rate adjustment module; 200, display panel. DETAILED DESCRIPTION

[0034] It needs to be understood that the terms used herein, the specific structures and functional details disclosed, are only for the purpose of describing specific embodiments, and are representative, but the present application can be embodied by many alternative forms, and should not be interpreted as being limited to the embodiments described herein.

[0035] In the description of the present application, the terms "first", "second" are only for the purpose of description, and should not be understood as indicating relative importance, or implying the number of the indicated technical features. Therefore, unless otherwise specified, the features limited by "first", "second" can explicitly or implicitly include one or more of the features; the meaning of "multiple" is two or more. The term "comprising" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof can exist or be added.

[0036] In addition, the terms indicating the orientation or positional relationship of "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are described based on the orientation or relative position relationship shown in the drawings, and are only for the convenience of the simplified description of the present application, and do not indicate that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0037] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0038] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0039] Example 1:

[0040] refer to Figures 1 to 3 As shown, as a first embodiment of the present application, a double-sided display device 10 is disclosed, comprising a display panel 200 and a backlight module 100, wherein the backlight module 100 comprises a lamp board 110 and a plurality of lamp beads 120 arranged on the lamp board 110; the lamp board 110 is generally provided with circuit wiring, and when powered on, the lamp beads 120 emit light to provide backlight for the double-sided display device 10, and the lamp beads 120 are mini-LED lamps or micro-LED lamps; the double-sided display device 10 further comprises a plurality of micro-rotating devices 130, wherein the micro-rotating devices 130 are arranged on the light-emitting surface of the lamp beads 120. On the top; the micro-rotation device 130 includes a transmission area 131 and a reflection area 132, and the micro-rotation device 130 changes or transforms the positions of the transmission area 131 and the reflection area 132 by rotation; generally, the area of ​​the lamp board 110 corresponding to the pixel display area of ​​the display panel 200 is transparent, or the entire lamp board 110 can also be set to be transparent, and the lamp board 110 can be glass, silicon board or transparent ceramic; the light emitted by the lamp bead 120 passes through the transmission area 131 to form the front image of the double-sided display device 10, and is reflected back by the reflection area 132 to form the back image of the double-sided display device 10.

[0041] In this embodiment, a micro-rotating device 130 is mainly provided on the light-emitting surface of the lamp bead 120. The micro-rotating device 130 includes a transmissive area 131 and a reflective area 132. The transmissive area 131 can transmit light, and the reflective area 132 can reflect light. The micro-rotating device 130 changes the positions of the transmissive area 131 and the reflective area 132 by its own rotation. When the transmissive area 131 of the micro-rotating device 130 rotates to be directly above the lamp bead 120, the double-sided display device 10 displays the front image; when the reflective area 132 of the micro-rotating device 130 rotates to be directly above the lamp bead 120, the double-sided display device 10 displays the back image. The transmissive area 131 and the reflective area 132 appear alternately above the lamp bead 120, so that the lamp bead 120 can provide backlight for both the front and back sides, thereby realizing double-sided display. The front and back images have the same resolution, and the resolution of the front and back images will not be reduced under the premise of realizing double-sided display.

[0042] Generally, the lamp beads 120 include red LED lights, green LED lights and blue LED lights. The number of red LED lights, green LED lights and blue LED lights is the same. One red LED light, one green LED light and one blue LED light form a lamp group. The lamp board 110 is provided with multiple lamp groups. The reflectivity of the reflection area 132 of the micro-rotating device 130 corresponding to the LED lights in each lamp group is different. The reflectivity of the reflection area 132 of the micro-rotating device 130 corresponding to the blue LED light is greater than the reflectivity of the reflection area 132 of the micro-rotating device 130 corresponding to the red LED light or the green LED light.

[0043] In order to achieve color display of the back image, this embodiment uses three different colors of lamp beads 120, namely red LED lights, green LED lights and blue LED lights. Different colors of images are displayed according to the different colors of lamp beads 120, rather than a single black and white display. In addition, while achieving color display on the back, the obvious difference in the loss of light of different colors is also taken into account. Blue light is weaker than other colors of light in terms of both transmittance and reflectivity. In order to avoid color deviation caused by insufficient amount of blue light during light mixing, the micro-rotating device 130 for blue light is adjusted. The reflectivity of the reflection area 132 of the micro-rotating device 130 corresponding to the blue LED light is greater than the reflectivity of the reflection area 132 of the micro-rotating device 130 corresponding to the red LED light or the green LED light. The amount of blue light during light mixing avoids large loss of blue light, and the color formed by mixing with red light and green light in the light mixing stage is yellowish, affecting the display effect.

[0044] Example 2:

[0045] As the second embodiment of this application, refer to Figures 1 to 5As shown, this embodiment is mainly described by taking the arrangement of one micro-rotation device 130 corresponding to one lamp bead 120 as an example, the areas of the transmission area 131 and the reflection area 132 are equal, and the area of ​​the transmission area 131 or the reflection area 132 is equal to the area of ​​one pixel display area; when the transmission area 131 rotates to above the lamp bead 120, the brightness value of the lamp bead 120 is L1, and when the reflection area 132 rotates to above the lamp bead 120, the brightness value of the lamp bead 120 is L2, wherein L1 is not equal to L2, the front image and the back image are different images, and the front and back displays of the double-sided display device 10 are realized by repeatedly switching the positions of the transmission area 131 and the reflection area 132, and at the same time changing the brightness value of the lamp bead 120, different grayscale displays can be presented, so that the images displayed on the front and back of the double-sided display device 10 are different.

[0046] In addition, the areas of the transmission area 131 and the reflection area 132 can be adjusted according to the display conditions. For example, the area ratio of the transmission area 131 and the reflection area 132 is 6:4, the area of ​​the transmission area 131 and the pixel display area is the same, and the area of ​​the reflection area 132 is smaller than the area of ​​the pixel display area. This is equivalent to reducing the area of ​​the display area of ​​the reflection area 132, thereby increasing the brightness of the picture on the back and avoiding the light in the reflection area 132 being reflected and part of the light being lost, resulting in the actual display brightness of the entire pixel display area being low, affecting the display effect.

[0047] Furthermore, the transmission area 131 is provided with a transparent layer 134, and the reflection area 132 is provided with a reflection layer 133. The transparent layer and the reflection layer 133 form a circular structure. The transparent layer 134 and the reflection layer 133 are both fan-shaped, and in the circular structure, the sum of the central angles of the transparent layer is the same as the sum of the central angles of the reflection layer, that is, in the circular structure composed of the reflection area 132 and the transmission area 131, the sum of the areas of the corresponding fan-shaped areas is equal; in order to increase the display effect of the display panel on the transmission surface, light-excitation material can be added to the transparent layer to increase the brightness of the light, so as to improve the display effect of the corresponding display surface; it should be noted that the transmission area 131 can also be a hollow setting, which is equivalent to the initial Part of the reflective layer 133 of a circular structure is hollowed out, the hollowed-out area is the transmissive area 131, and the non-hollowed-out area is the reflective area 132. The reflective coating of the reflective area 132 is generally arranged on the side close to the lamp bead 120 to reflect the light emitted by the lamp bead 120 back, and the side away from the lamp bead 120 can be coated with a reflective material as needed. If the reflective material is not coated, a black opaque material can be coated to form a shading layer 135 to absorb the ambient light from the front. In this way, a black matrix can be omitted in the display panel 200. In addition, in addition to coating the reflective material to achieve reflection, a reflector can be set on the side of the reflective area 132 close to the lamp bead to achieve reflection.

[0048] Example 3:

[0049] like Figure 6 As shown, as the third embodiment of the present application, different from the above-mentioned second embodiment, each of the micro-rotation devices 130 is arranged corresponding to at least two of the lamp beads 120, the areas of the transmission area 131 and the reflection area 132 are equal, and the area of ​​the transmission area 131 or the reflection area 132 is equal to the area of ​​a pixel display area; the transmission area 131 and the reflection area 132 include at least two fan-shaped areas, the transmission area 131 is hollow, and a reflection layer 133 is provided in the reflection area 132; when the transmission area 131 rotates to above one of the lamp beads 120, the reflection area 132 rotates to above the other lamp bead.

[0050] In this embodiment, a micro-rotating device 130 can be set to correspond to two lamp beads 120, that is, one rotating device controls two direct display pixels, and the position design of the transmission area 131 and the reflection area 132 of the rotating device can further reduce the spacing between the lamp beads 120, and the area of ​​the pixel display area can also be further reduced, thereby improving the refresh rate of the front and back of the double-sided display device 10. The transmission area 131 is hollowed out, and the reflection area 132 is provided with a reflective layer 133. The reflection area 132 is arranged opposite to the transmission area 131, and the refresh rate is improved by alternating the front and back displays of adjacent same-color pixels.

[0051] like Figure 8 As shown, generally, a micro-rotating device 130 can correspond to four direct display pixels, and the spacing between the lamp beads 120 is increased from top to bottom and left to right to increase the refresh rate; the micro-rotating device 130 is composed of two fan-shaped transmission areas 131 and two fan-shaped reflection areas 132. The transmission areas 131 and the reflection areas 132 are arranged at intervals, and the positions of the transmission areas 131 and the reflection areas 132 are changed by rotation. When the two fan-shaped transmission areas 131 rotate to the top of the upper and lower lamp beads 120, the two lamp beads The light emitted by the two lamp beads 120 directly passes through the corresponding transmission area 131, and the upper and lower lamp beads 120 provide backlight for the front display of the double-sided display device 10; at the same time, the two fan-shaped reflection areas 132 rotate to the top of the left and right lamp beads 120, and the light emitted by the left and right lamp beads 120 is reflected back to the lamp beads 120 by the two fan-shaped reflection areas 132. The light reflected back by the left and right lamp beads 120 by the reflection areas 132 serves as the backlight for the back display of the double-sided display device 10 to realize the display of the back image.

[0052] Furthermore, the lamp beads 120 are micro-LED lamps, each of which corresponds to a pixel display area. The lamp beads 120 are arranged in multiple rows and columns, and four adjacent lamp beads 120 form a lamp group. The lamp beads 120 in each lamp group are arranged in 2*2. Each lamp group is provided with a micro-rotating device 130, and the micro-rotating device 130 is provided with two fan-shaped transmission areas 131 and reflection areas 132, and the transmission areas 131 and the reflection areas 132 are arranged at intervals. The four lamp beads 120 in each lamp group are respectively a red LED lamp, a green LED lamp, a blue LED lamp and a white LED lamp.

[0053] In this embodiment, one micro-rotating device 130 is provided with four lamp beads 120. When the micro-rotating device 130 is not rotating, the two transmissive areas 131 are located directly above the upper and lower lamp beads 120, and the two reflective areas 132 are located directly above the left and right lamp beads 120. The two transmissive areas 131 and the two reflective areas 132 are arranged alternately. By continuously rotating clockwise or counterclockwise, the positions of the transmissive areas 131 or the reflective areas 132 are continuously changed, so that the upper and lower or left and right lamp beads 120 serve as the backlight for the front display and the back display respectively, thereby realizing a double-sided display of the double-sided display device 10. In addition, the light obtained by mixing the three colors of light of red LED lamp, green LED lamp and blue LED lamp may not be pure enough. Therefore, a white LED lamp is added to adjust the color temperature to improve the display effect.

[0054] Example 4:

[0055] refer to Figures 9 to 11As shown, as the fourth embodiment of the present application, it is a further refinement and improvement of any of the above embodiments. The micro-rotation device 130 is rotated by a driving structure 140. The driving structure 140 includes a fixed rod 141 and a driving wall 142. The fixed rod 141 is fixed to the light board 110. The driving wall 142 is sleeved on the fixed rod 141. The side of the driving wall 142 away from the light board 110 is fixedly connected to the micro-rotation device 130; the driving wall 142 is made of conductive material, and at least two driving electrodes are provided on both sides of the driving wall 142. 150, of the two driving electrodes 150, one is located below the transmission area 131, and the other is located below the reflection area 132; an electric field is generated between the two driving electrodes 150 to cause the driving wall 142 to rotate, thereby driving the micro-rotation device 130 to rotate. When the transmission area 131 of the micro-rotation device 130 rotates to directly above the lamp bead 120, the double-sided display device 10 displays the front image; when the reflection area 132 of the micro-rotation device 130 rotates to directly above the lamp bead 120, the double-sided display device 10 displays the back image.

[0056] The micro-rotating device 130 and the driving structure 140 are integrally formed by two-photon 3D printing and other technologies. During the preparation of the micro-selective device, charged particles are added to make the driving wall 142 have a certain electrical property so that it can be driven by the electrode (or magnetic particles are added to make the micro-rotating device 130 magnetic and driven by the magnetic field. The electrical drive is used as an example in the following). The driving wall 142 is used to bear the force to rotate the entire micro-rotating device 130 at any angle, and the position of the transmission area 131 and the reflection area 132 is switched by continuously rotating in the clockwise or counterclockwise direction. At least two of the lamp beads 120 are set as an example for explanation. The transmission area 131 of the micro-rotation device 130 includes two transmission sector areas that are symmetrical to each other with the fixed rod 141 as the center. The transmission sector areas are formed of transparent material or directly hollowed out. The driving wall 142 is fixedly connected to the two transmission sector areas on the side away from the lamp board 110. The reflection area 132 includes two reflection sector areas that are symmetrical to each other with the fixed rod 141 as the center; a reflective coating is provided on the side of the reflection sector area close to the lamp bead 120, and the reflective coating can reflect the light emitted by the lamp bead 120 back.

[0057] Furthermore, to prevent the micro-rotating device 130 from rotating too far, limit structures are provided on both sides of the drive wall 142 of each micro-rotating device 130. The limit structures are intended to stabilize the rotation angle of the micro-rotating device 130 within 90°. Furthermore, electrodes are provided near the limit structures to drive the micro-rotating device 130 in rotation. This is primarily accomplished by an external driver IC supplying electrical energy to the electrodes, which in turn applies force to the electrically charged drive wall 142, causing it to rotate.

[0058] Furthermore, the double-sided display device 10 includes a refresh rate adjustment module 160, which is electrically connected to the drive electrode 150. The refresh rate adjustment module 160 controls the rotation speed of the micro-rotation device 130 by outputting voltages of different sizes to the drive electrode 150, thereby changing the refresh rate of the front display or the back display of the double-sided display device 10.

[0059] The display panel 200 displays different front and back images by rotating the micro-rotating device 130 and adjusting the brightness of the direct display light source. When the transmissive area 131 of the micro-rotating device 130 rotates to directly above the direct display light source, it is the front display image, and the displayed image is determined by the brightness of the direct display light source. The duration of one frame is the duration of the direct display light source display in the transmissive area 131. When the reflective area 132 is directly above the direct display light source, it is the back display, and the back display is consistent with the front display mode. The refresh frequency of the front image or the back image is determined by the rotation speed of the micro-rotating device 130. The faster the rotation speed, the higher the refresh rate. Assuming that the rotation period of the micro-rotating device 130 is T, and the angle (θ) and number (n) of the rotating platform occupied by the hollow part and the reflective part of the micro-rotating device platform are consistent, the time of one frame is The time of one frame can be adjusted by the rotation speed of the rotating device.

[0060] Example 5:

[0061] like Figure 12 As shown, as the seventh embodiment of the present application, a driving method for a double-sided display device is disclosed, the driving method is used to drive the display device as described in any of the above embodiments, and the driving method includes the steps of:

[0062] S1: Turning on the lamp beads on the backlight module to make the lamp beads emit light; and

[0063] S2: Rotate the micro-rotating device to change the position of the transmission area and the reflection area;

[0064] refer to Figure 1 value Figure 3As shown, when the transmission area 131 rotates to directly above the lamp bead 120, the light emitted by the lamp bead 120 passes through the transmission area 131 to form the front image of the double-sided display device 10, and when the reflection area 132 rotates to directly above the lamp bead 120, the light emitted by the lamp bead 120 is reflected back by the reflection area 132 to form the back image of the double-sided display device 10.

[0065] A micro-rotating device provided with a transmissive area 131 and a reflective area 132 is arranged on the light-emitting surface of the lamp bead 120. The heights of the transmissive area 131 and the reflective area 132 are controlled within a preset threshold range, for example, between 0.1 cm and 2 cm. Some electrodes are negatively charged and adjacent electrodes are positively charged. A horizontal electric field is formed by the adjacent electrodes, causing the driving wall 142 to rotate, thereby driving the micro-rotator to rotate. The speed of the micro-rotator can be controlled by the amount of electricity supplied by the electrodes. The micro-rotating device is driven to rotate by the electric field generated by the driving electrode 150. Through continuous rotation, the reflective area 132 and the transmissive area 131 rotate alternately to directly above the direct display pixel light source, thereby realizing double-sided display.

[0066] For further reference, Figures 1 to 3 ,as well as Figure 11 As shown, considering that the refresh rate required for continuously displaying images may remain unchanged during display, this embodiment can control the refresh rate of the double-sided display device 10 by turning on the refresh rate adjustment module 160. The step S2 includes:

[0067] S21: Turn on the refresh rate adjustment module to output different driving voltages to the driving electrodes of the micro-rotating device, change the rotation speed of the micro-rotating device, and adjust the refresh rates of the front and back images of the double-sided display device.

[0068] The double-sided display device 10 of the present application does not need to rely on the scanning time of the scanning line of the display panel 200 to increase the refresh rate. The refresh rate of the present application is determined by the rotation speed of the micro-rotating device 130. The faster the rotation speed, the higher the refresh rate. For example, if the rotation period of the micro-rotating device is T and the angle (θ) and number (n) of the rotating platform occupied by the hollow part and the reflective part of the micro-rotating device platform are the same, then the time of one frame is The time of one frame can be adjusted by the rotation speed of the rotating device.

[0069] It should be noted that the limitations on the steps involved in this solution do not limit the order of the steps without affecting the implementation of the specific solution. The steps written in front can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be deemed to fall within the scope of protection of this application.

[0070] It should be noted that the inventive concept of this application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the various embodiments or technical features are combined, the original technical effects will be enhanced.

[0071] The above content is a further detailed description of the present application in conjunction with specific optional implementation methods, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, they can make several simple deductions or substitutions without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.

Claims

1. A double-sided display device, comprising a display panel and a backlight module, characterized in that: The backlight module includes a lamp board and a plurality of lamp beads arranged on the lamp board; The double-sided display device further includes a plurality of micro-rotating devices, each of which is arranged on the light-emitting surface of the lamp bead; the micro-rotating devices include a transmissive area and a reflective area, and the positions of the transmissive area and the reflective area are changed by the rotation of the micro-rotating devices; In which, the area of ​​the light board corresponding to the pixel display area of ​​the display panel is transparent. When the transmission area of ​​the micro-rotating device rotates to directly above the lamp bead, the light emitted by the lamp bead passes through the transmission area to form the front image of the double-sided display device. When the reflection area of ​​the micro-rotating device rotates to directly above the lamp bead, the light emitted by the lamp bead is reflected back by the reflection area to form the back image of the double-sided display device.

2. The double-sided display device according to claim 1, wherein: One of the micro-rotating devices is provided corresponding to one of the lamp beads, the areas of the transmission area and the reflection area are equal, and the area of ​​the transmission area or the reflection area is equal to the area of ​​a pixel display area; when the transmission area rotates to above the lamp bead, the brightness value of the lamp bead is L1, and when the reflection area rotates to above the lamp bead, the brightness value of the lamp bead is L2, wherein L1 is not equal to L2, and the front image and the back image are different images.

3. The double-sided display device according to claim 2, wherein: The transmission area is provided with a transparent layer, and the reflection area is provided with a reflective layer. The transparent layer and the reflective layer form a circular structure. The transparent layer and the reflective layer are both fan-shaped, and within the circular structure, the sum of the central angles of the transparent layer is the same as the sum of the central angles of the reflective layer.

4. The double-sided display device according to claim 1, wherein: Each of the micro-rotating devices is arranged corresponding to at least two of the lamp beads, the areas of the transmission area and the reflection area are equal, and the area of ​​the transmission area or the reflection area is equal to the area of ​​a pixel display area; the transmission area and the reflection area include at least two fan-shaped areas, the transmission area is hollow, and a reflection layer is provided in the reflection area; when the transmission area rotates to above one of the lamp beads, the reflection area rotates to above the other lamp bead.

5. The double-sided display device according to claim 1, wherein: The lamp beads include red LED lights, green LED lights and blue LED lights. The number of the red LED lights, green LED lights and blue LED lights is the same. One red LED light, one green LED light and one blue LED light form a lamp group. The lamp panel is provided with multiple lamp groups. The reflectivity of the reflection area of ​​the micro-rotating device corresponding to the LED lights in each lamp group is different. The reflectivity of the reflection area of ​​the micro-rotating device corresponding to the blue LED light is greater than the reflectivity of the reflection area of ​​the micro-rotating device corresponding to the red LED light or the green LED light.

6. The double-sided display device according to claim 1, wherein: The lamp beads are micro-LED lamps, each of which corresponds to a pixel display area. The lamp beads are arranged in multiple rows and columns, and four adjacent lamp beads form a lamp group. The lamp beads in each lamp group are arranged in 2*2. Each lamp group is provided with a micro-rotating device, and the micro-rotating device has two fan-shaped transmission areas and reflection areas, and the transmission areas and reflection areas are arranged at intervals. The four lamp beads in each lamp group are respectively a red LED lamp, a green LED lamp, a blue LED lamp and a white LED lamp.

7. The double-sided display device according to any one of claims 1 to 6, wherein: The micro-rotating device is rotated by a driving structure, the driving structure comprising a fixed rod and a driving wall, the fixed rod being fixed to the light board, the driving wall being sleeved on the fixed rod, and the side of the driving wall away from the light board being fixedly connected to the micro-rotating device; the driving wall is made of a conductive material, and at least two driving electrodes are provided on both sides of the driving wall, one of the two driving electrodes being located below the transmissive area and the other being located below the reflective area; An electric field is generated between the two driving electrodes to cause the driving wall to rotate, thereby driving the micro-rotating device to rotate. When the transmission area of ​​the micro-rotating device rotates to directly above the lamp bead, the double-sided display device displays the front image; When the reflective area of ​​the micro-rotating device rotates to the position directly above the lamp bead, the double-sided display device displays the back image.

8. The double-sided display device according to claim 7, wherein: The double-sided display device includes a refresh rate adjustment module, which is electrically connected to the drive electrode. The refresh rate adjustment module controls the rotation speed of the micro-rotating device by outputting voltages of different magnitudes to the drive electrode, thereby changing the refresh rate of the front display or the back display of the double-sided display device.

9. A method for driving a double-sided display device, for driving the display device according to any one of claims 1 to 8, characterized in that: The driving method comprises the steps of: Turning on the lamp beads on the backlight module to enable the lamp beads to emit light; and Rotating the micro-rotating device changes the positions of the transmission area and the reflection area; Among them, when the transmission area rotates to directly above the lamp bead, the light emitted by the lamp bead passes through the transmission area to form the front image of the double-sided display device. When the reflection area rotates to directly above the lamp bead, the light emitted by the lamp bead is reflected back by the reflection area to form the back image of the double-sided display device.

10. The driving method according to claim 9, wherein: The step of rotating the micro-rotating device to change the positions of the transmission area and the reflection area comprises: The refresh rate adjustment module is turned on to output different driving voltages to the driving electrodes of the micro-rotating device, thereby changing the rotation speed of the micro-rotating device to adjust the refresh rates of the front and back images of the double-sided display device.

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