CN111880334B - Backlight module, display device and control method thereof - Google Patents
Backlight module, display device and control method thereof Download PDFInfo
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- CN111880334B CN111880334B CN202010711773.6A CN202010711773A CN111880334B CN 111880334 B CN111880334 B CN 111880334B CN 202010711773 A CN202010711773 A CN 202010711773A CN 111880334 B CN111880334 B CN 111880334B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
- H04M1/0264—Details of the structure or mounting of specific components for a camera module assembly
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Multimedia (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Planar Illumination Modules (AREA)
Abstract
The embodiment of the invention discloses a backlight module, a display device and a control method thereof, wherein the backlight module comprises a back plate, a first optical film layer, a light guide plate and a second optical film layer which are arranged in a stacked mode; the light guide plate comprises a first side edge and a second side edge which are opposite; the first side edge is provided with a first rolling shaft and a third rolling shaft; the second side edge is provided with a second rolling shaft and a fourth rolling shaft; the back plate is provided with an opening; the first optical film layer is provided with a first through hole; the second optical film layer is provided with a second through hole; in the display mode, the first optical film layer at the position of the first through hole is curled onto the first roller; the second optical film layer at the position of the second through hole is curled to the third rolling shaft; in the photographing mode, part of the first optical film layer is curled onto the second roller; a part of the second optical film layer is curled onto the fourth roller; the vertical projections of the first through hole and the second through hole on the back plate are overlapped with the opening. The display device with the backlight module can have the functions of full-screen display and front camera shooting.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a backlight module, a display device and a control method of the display device.
Background
With the development of display technology, full-screen design becomes an important development project.
For multifunctional intelligent display equipment such as a mobile phone, a front camera area is reserved above a screen, and comprehensive display cannot be achieved. In the prior art, screen design schemes such as a 'Liuhai screen' and a 'water drop screen' are commonly used for improving the screen occupation ratio, but the scheme is difficult to really realize a full-face screen. In addition, although the existing sliding-cover camera design can hide the camera inside the mobile phone to realize full-screen display, the scheme obviously increases the thickness of the mobile phone and has the defects of easy dust accumulation, high cost and the like.
Therefore, the realization of a full screen is still a technical problem, and a more optimal scheme is still urgently needed to be developed.
Disclosure of Invention
The embodiment of the invention provides a backlight module, a display device and a control method thereof.
In a first aspect, an embodiment of the present invention provides a backlight module, including:
the back plate, the first optical film layer, the light guide plate and the second optical film layer are stacked;
the light guide plate comprises a first side edge and a second side edge which are opposite; the first side edge is provided with a first rolling shaft and a third rolling shaft; the second side edge is provided with a second rolling shaft and a fourth rolling shaft;
the back plate is provided with an opening; the first optical film layer is provided with a first through hole; the second optical film layer is provided with a second through hole;
in the display mode, the first optical film layer at the position of the first through hole is curled onto the first roller; the second optical film layer at the position of the second through hole is curled onto the third roller;
in the photographing mode, part of the first optical film layer is curled onto the second roller; a part of the second optical film layer is curled onto the fourth roller; the vertical projections of the first through hole and the second through hole on the back plate are overlapped with the opening.
In a second aspect, an embodiment of the present invention further provides a display device, including a display panel and the backlight module provided in the previous aspect; the backlight module is used for providing backlight for the display panel.
In a third aspect, an embodiment of the present invention further provides a method for controlling a display device, which is applied to the display device provided in the previous aspect, and includes:
in the display mode, the first roller and the second roller are controlled to drive the first optical film layer to move, and the first optical film layer at the position of the first through hole is curled onto the first roller; controlling the third roller and the fourth roller to drive the second optical film layer to move, and curling the second optical film layer at the position of the second through hole onto the third roller;
in a photographing mode, controlling the first roller and the second roller to drive the first optical film layer to move, and curling part of the first optical film layer onto the second roller; controlling the third roller and the fourth roller to drive the second optical film layer to move, and curling part of the second optical film layer onto the fourth roller; so that the vertical projections of the first through hole and the second through hole on the back plate are overlapped with the opening.
In the embodiment of the invention, the first roller, the second roller, the third roller and the fourth roller are additionally arranged, the first roller and the second roller are utilized to drive the first optical film layer to move, and the third roller and the fourth roller are utilized to drive the second optical film layer to move, so that in a display mode, the position of the first through hole on the first optical film layer can be curled onto the first roller, and the position of the second through hole on the second optical film layer can be curled onto the third roller, so that the backlight module can provide backlight for the whole display screen, and full-screen display is realized; in a similar way, when the photographing mode is performed, the vertical projection of the first through hole and the second through hole on the backboard can be overlapped with the opening on the backboard by moving the first optical film layer and the second optical film layer, so that the ambient light can enter the image sensor (such as a camera) through the first through hole, the second through hole and the opening of the backboard, and the photographing function is realized.
Drawings
Fig. 1 is a schematic top view of a backlight module according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along AA' of the backlight module shown in FIG. 1 in a display mode;
FIG. 3 is a schematic cross-sectional view taken along AA' of the backlight module shown in FIG. 1 in a photographing mode;
FIG. 4 is a schematic cross-sectional view taken along BB' of the backlight module shown in FIG. 1;
fig. 5 is a schematic structural diagram of a backlight module according to another embodiment of the invention;
fig. 6 is a schematic structural diagram of a backlight module according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a backlight module according to another embodiment of the invention;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of the display device shown in FIG. 8 taken along AA';
FIG. 10 is a schematic cross-sectional view of the display device shown in FIG. 8 taken along line BB';
fig. 11 is a flowchart illustrating a control method of a display device according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a display device in a photographing mode according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic top view structure diagram of a backlight module according to an embodiment of the present invention, fig. 2 is a schematic cross-sectional structure diagram of the backlight module shown in fig. 1 taken along AA 'in a display mode, fig. 3 is a schematic cross-sectional structure diagram of the backlight module shown in fig. 1 taken along AA' in a photographing mode, referring to fig. 1-3, the backlight module 10 according to an embodiment of the present invention includes a back plate 110, a first optical film layer 120, a light guide plate 130, and a second optical film layer 140, which are stacked; the light guide plate 130 includes opposite first and second side edges; the first side edge is provided with a first roller 151 and a third roller 153; the second side edge is provided with a second roller 152 and a fourth roller 154; the back plate 110 is provided with an opening 111; the first optical film layer 120 is provided with a first through hole 121; the second optical film layer 140 is provided with a second through hole 141; in the display mode, the first optical film layer 120 at the position of the first through hole 121 is curled onto the first roller 151; the second optical film 140 at the position of the second through hole 141 is wound onto the third roller 153; in the photographing mode, a portion of the first optical film 120 is wound onto the second roller 152; a portion of the second optical film layer 140 is rolled onto the fourth roller 154; the vertical projections of the first through hole 121 and the second through hole 141 on the back plate 110 overlap the opening 111.
For example, the first optical film layer 120 may be a reflective layer for reflecting the light incident on the non-light-emitting side of the backlight module 10 to the light-emitting side again, so as to improve the utilization rate of the light. For example, the second optical film layer 140 may be a combination of various optical film layers, and may include a lower diffusion sheet, a lower prism sheet, an upper prism sheet, and an upper diffusion sheet, which are sequentially arranged from bottom to top, and respectively perform the functions of homogenizing light and improving display brightness.
According to the scheme, the first through hole 121 is formed in the first optical film layer 120, the second through hole 141 is formed in the second optical film layer 140, and the opening 111 is formed in the back plate 110, so that ambient light can irradiate the image sensor through the first through hole 121, the light guide plate 130, the second through hole 141 and the opening 111 in the photographing mode. Illustratively, the position of the circular dashed box in fig. 1 corresponds to the position where the image sensor (e.g., camera) is disposed. Accordingly, the position of the opening 111 of the backplate 110 corresponds to the position of the dashed line frame, and the positions of the first through hole 121 and the second through hole 141 correspond to the positions of the dashed line frame in the photographing mode.
In order to enable the display device to have a full-screen display function and a front-mounted camera function, the embodiment of the invention adopts the following scheme to improve the backlight module.
Specifically, in the embodiment of the present invention, the first roller 151 and the third roller 153 are disposed on the first side edge (e.g., side a in fig. 1) of the light guide plate 130, and the second roller 152 and the fourth roller 154 are disposed on the second side edge (e.g., side a' in fig. 1) of the light guide plate 130, the first optical film 120 is driven to move by the first roller 151 and the second roller 152, and the second optical film 140 is driven to move by the third roller 153 and the fourth roller 154, so that the relative positions between the first through hole 121 and the second through hole 141 and the opening 111 can be controlled, and further, the switching between the full-screen display function and the front camera function is realized.
For example, referring to fig. 2, in the display mode, the first optical film 120 at the position of the first through hole 121 is curled onto the first roller 151, and the second optical film 140 at the position of the second through hole 141 is curled onto the third roller 153, at this time, the backlight module 10 can provide a light source for the whole display screen, so as to implement a full-screen display function. Referring to fig. 3, in the photographing mode, a portion of the first optical film layer 120 is wound on the second roller 152, and a portion of the second optical film layer 140 is wound on the fourth roller 154, at this time, the vertical projections of the first through hole 121 and the second through hole 141 on the back plate 110 overlap with the opening 111, and ambient light can be irradiated to an image sensor (not shown in fig. 3) located at the lower side of the back plate 110 through the first through hole 121, the light guide plate 130, the second through hole 141, and the opening 111, thereby implementing a front camera function. Compared with the prior art that full-screen display is realized by rotating the image sensor, the scheme of realizing full-screen display by moving the first optical film layer and the second optical film layer has lower requirement on space, does not obviously increase the thickness of the display device, and does not have the problems of dust accumulation and the like.
It should be noted that the first roller 151, the second roller 152, the third roller 153, and the fourth roller 154 may have various configurations, which is not limited in the embodiment of the present invention, as long as the scheme for switching the display mode and the photographing mode by moving the optical film layer in the backlight module 10 through the rollers is within the protection scope of the present invention. Fig. 2 shows an example of a possible arrangement, which will be described in detail later.
In the embodiment of the invention, the first roller, the second roller, the third roller and the fourth roller are additionally arranged, the first roller and the second roller are utilized to drive the first optical film layer to move, and the third roller and the fourth roller are utilized to drive the second optical film layer to move, so that in a display mode, the position of the first through hole on the first optical film layer can be curled onto the first roller, and the position of the second through hole on the second optical film layer can be curled onto the third roller, so that the backlight module can provide backlight for the whole display screen, and full-screen display is realized; in a similar way, when the photographing mode is performed, the vertical projection of the first through hole and the second through hole on the backboard can be overlapped with the opening on the backboard by moving the first optical film layer and the second optical film layer, so that the ambient light can enter the image sensor (such as a camera) through the first through hole, the second through hole and the opening of the backboard, and the photographing function is realized.
On the basis of the above embodiments, the structure of the backlight module 10 will be further described below.
With continued reference to fig. 3, optionally, the light guide plate 130 includes a first portion 131 and a second portion 132; the first portion 131 is separated from the second portion 132; the perpendicular projection of the second portion 132 on the back plate 110 overlaps the opening 111; in the display mode, the first portion 131 and the second portion 132 are located on the same plane; in the photographing mode, the second portion 132 with at least a partial thickness is located in the second through hole 141 along a direction perpendicular to the light emitting surface of the backlight module 10 (not shown in fig. 3).
In this embodiment, the light guide plate 130 is disposed as the first portion 131 and the second portion 132 which are separated from each other, so that the second portion 132 is located corresponding to the opening 111 of the back plate 110, and when in the photographing mode, the image sensor is controlled to move upward along the arrow direction shown in fig. 3, and the second portion 132 with at least a partial thickness is pushed to be located in the second through hole 141, so that the distance between the image sensor and the display screen can be shortened, the field angle of the image sensor is increased, the image sensor receives more light, and the photographing quality is improved.
With continued reference to fig. 3, further optionally, the second portion 132 has a trapezoidal shape; and the surface area of the side of the second portion 132 facing the second optical film layer 140 is greater than the surface area of the side facing away from the second optical film layer 140.
So set up, when withdrawing from the mode of shooing, can utilize the bottom card of first portion 131 to hold second portion 132, guarantee the stability of light guide plate 130 structure.
Fig. 4 is a schematic cross-sectional view of the backlight module shown in fig. 1, taken along BB', and referring to fig. 1 and 4, optionally, the backlight module 10 further includes a backlight 160; the light guide plate 130 further includes opposite third and fourth sides; the backlight 160 is disposed at the third side edge and/or the fourth side edge.
Fig. 4 exemplarily shows a structure in which the backlight 160 is disposed at both the third side (for example, side B in fig. 1) and the fourth side (for example, side B' in fig. 1) of the light guide plate 130, and in other embodiments, the backlight 160 may be disposed at only the third side or the fourth side, which is not limited in this embodiment of the present invention and can be set by a person skilled in the art according to needs.
It should be noted that the setting positions of the 4 rollers and the setting position of the backlight source may be interchanged, that is, in other embodiments, the first roller and the third roller may be disposed on the third side, the second roller and the fourth roller may be disposed on the fourth side, and the backlight source may be disposed on the first side and/or the second side, which is not limited in this embodiment of the present invention.
Optionally, the backlight module 10 further includes a first driving mechanism and a second driving mechanism; the first driving mechanism is electrically connected to the first roller 151 and the second roller 152, respectively; the second driving mechanism is electrically connected to the third roller 153 and the fourth roller 154, respectively.
The rotation of the first roller 151 and the second roller 152 may be controlled by a first driving mechanism, and the rotation of the third roller 153 and the fourth roller 154 may be controlled by a second driving mechanism. For example, the first driving mechanism and the second driving mechanism may be integrated as a whole, and the arrangement manner of the first driving mechanism and the second driving mechanism is not limited in the embodiment of the present invention, and may be designed by a person skilled in the art.
Referring to fig. 1, 2 and 4, optionally, the backlight module 10 further includes a rubber frame 170; the rubber frame 170 is disposed around the light guide plate 130; the rubber frame 170 at the periphery of the first side of the light guide plate 130 is located at one side of the first roller 151 and the third roller 153 away from the light guide plate 130; the rubber frame 170 at the periphery of the second side edge of the light guide plate 130 is located at one side of the second roller 152 and the fourth roller 154 away from the light guide plate 130.
Specifically, taking the structure shown in fig. 2 and 4 as an example, the rubber frame 170 is disposed between the back plate 110 and other components (such as the backlight 160, the third roller 153, and the fourth roller 154) inside the back plate, and mainly plays roles of fixing, isolating, and protecting, so as to prevent the performance of the display device from being reduced due to the looseness of the internal components.
In summary, the above embodiments describe the structure of the backlight module 10 in detail. In the following, 4 possible arrangements are provided for four rollers.
First, referring to fig. 2, optionally, the first roller 151 and the second roller 152 are located between the third roller 153 and the fourth roller 154.
Further, the diameters of the first roller 151 and the second roller 152 are the same; the diameters of third roller 153 and fourth roller 154 are the same; the diameter of the first roller 151 is smaller than the diameter of the third roller 153; the axes of the first roller 151, the second roller 152, the third roller 153, and the fourth roller 154 are located on the same plane.
For example, the diameters of the first roller 151, the second roller 152, the third roller 153, and the fourth roller 154 may range from 2mm to 3 mm. Specifically, in this embodiment, the axes of the 4 rollers are disposed on the same plane, and the diameters of the first roller 151 and the second roller 152 are the same, and the diameters of the third roller 153 and the fourth roller 154 are the same, so that the first optical film layer 120 and the second optical film layer 140 are parallel to the plane of the light guide plate 130, and the original functions thereof are not affected. Further, the diameter of the first roller 151 is smaller than that of the third roller 153, so that the mutual friction between the first optical film 120 and the second optical film 140 can be avoided when the roller rotates, the normal switching between the display mode and the photographing mode is ensured, and the quality of the backlight module is also ensured.
Secondly, referring to fig. 5, fig. 5 is a schematic structural diagram of a backlight module according to another embodiment of the present invention. As shown in fig. 5, optionally, a third roller 153 and a fourth roller 154 are positioned between the first roller 151 and the second roller 152. Further, the diameters of the first roller 151 and the second roller 152 are the same; the third roller 153 and the fourth roller 154 have the same diameter; the diameter of the first roller 151 is larger than that of the third roller 153; the axes of the first roller 151, the second roller 152, the third roller 153, and the fourth roller 154 are located on the same plane. The design concept of this arrangement is the same as that of the structure shown in fig. 2, and will not be described herein again.
Thirdly, referring to fig. 6, fig. 6 is a schematic structural diagram of a backlight module according to another embodiment of the present invention. As shown in fig. 6, optionally, a third roller 153 is located between the first roller 151 and the second roller 152, and a fourth roller 154 is located on a side of the second roller 152 facing away from the first roller 151; alternatively, the fourth roller 154 is located between the first roller 151 and the second roller 152, and the third roller 153 is located on a side of the first roller 151 facing away from the second roller 152.
It should be noted that fig. 6 only shows the arrangement of 4 rollers by taking the fourth roller 154 as an example, which is located between the first roller 151 and the second roller 152, and the third roller 153 is located on the side of the first roller 151 away from the second roller 152. In this arrangement, the diameters of first roller 151 and third roller 153 are not limited as long as the diameters of first roller 151 and second roller 152 are the same and the axes thereof are on the same plane, and the diameters of third roller 153 and fourth roller 154 are the same and the axes thereof are on the same plane.
As for the arrangement of the rollers shown in fig. 2, 5, and 6, in order to switch between the display mode and the photographing mode, it is necessary to make the moving directions of the first roller 151 and the second roller 152 the same, the moving directions of the third roller 153 and the fourth roller 154 the same, and the moving directions of the first roller 151 and the third roller 153 opposite to each other at the same time.
Fourthly, referring to fig. 7, fig. 7 is a schematic structural diagram of a backlight module according to another embodiment of the present invention. As shown in fig. 7, alternatively, the axes of the first roller 151 and the second roller 152 are located on the same plane; the axes of the third roller 153 and the fourth roller 154 are located on the same plane; there is a space between the plane of the axes of the first and second rollers 151 and 152 and the plane of the axes of the third and fourth rollers 153 and 154. This arrangement is also possible, but the thickness of the backlight module 10 is increased, so that the first roller 151, the second roller 152, the third roller 153 and the fourth roller 154 are preferably arranged in the above 3 ways.
Based on the same inventive concept, the embodiment of the invention also provides a display device. For example, fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention, fig. 9 is a schematic structural diagram of a cross section of the display device shown in fig. 8 taken along AA ', fig. 10 is a schematic structural diagram of a cross section of the display device shown in fig. 8 taken along BB', referring to fig. 8-10, the display device 01 includes a display panel 20 and the backlight module 10 according to any of the embodiments, and the backlight module 10 is configured to provide backlight to the display panel 20.
The display panel 20 mainly includes an array substrate, a color filter substrate, and a liquid crystal layer located between the array substrate and the color filter substrate, and those skilled in the art can design the display panel by themselves, which will not be described herein.
Since the display device 01 includes the backlight module 10 provided in any of the above embodiments, it can have both the full-screen display function and the front-end camera function. The structure of the backlight module 10 can refer to the description of the above embodiments, and will not be described herein.
It should be noted that the display device 01 provided in the embodiment of the present invention may be a mobile phone as shown in fig. 8, and may also be any electronic product having a display function and a front-facing camera function, including but not limited to the following categories: the touch screen display device includes a television, a notebook computer, a desktop display, a tablet computer, a vehicle-mounted display, medical equipment, industrial control equipment, a touch interaction terminal and the like, and the embodiment of the invention is not particularly limited thereto.
The structure of the display device 01 will be further described below by taking a mobile phone as an example.
With continued reference to fig. 9 and 10, optionally, the display device 01 further includes a light-shielding glue 30; the light shielding glue 30 is located on one side of the display panel 20 facing the backlight module 10; the vertical projection of the light blocking paste 30 on the plane of the light guide plate 130 does not overlap the light guide plate 130.
The light leakage can be prevented by arranging the light shielding glue 30, dust accumulation can be prevented, and the quality of the display device is ensured.
With continued reference to fig. 9 and 10, further, the display device 01 further includes a lubricating layer 40; the lubricating layer 40 is coated on one side of the light shading glue 30 facing the backlight module 10; the perpendicular projection of the lubricating layer 40 on the plane of the display panel 20 is located within the perpendicular projection of the light shielding glue 30 on the plane of the display panel 20.
The light shielding glue 30 and the second optical film 140 have friction therebetween, and the embodiment of the invention can reduce the friction between the second optical film 140 and the light shielding glue 30 by disposing the lubricating layer 40 on the side of the light shielding glue 30 facing the backlight module 10, thereby facilitating the movement of the second optical film 140.
It should be noted that the lubricant layer 40 may also be applied to a side of the backlight module 10 facing the light shielding glue 30, and it is also ensured that a vertical projection of the lubricant layer 40 on a plane of the display panel 20 is located within a vertical projection of the light shielding glue 30 on the plane of the display panel 20.
It should be noted that, in this embodiment, the lubricating layer 40 is applied on the whole side of the light-shielding adhesive facing the backlight module 10, in other embodiments, the lubricating layer 40 may be applied only on a part of the light-shielding adhesive which is consistent with the moving direction of the first optical film layer 120 and the second optical film layer 140, which is not limited in this embodiment of the present invention.
Correspondingly, the embodiment of the invention also provides a control method of the display device, which is suitable for the display device provided by any one of the embodiments. Fig. 11 is a flowchart illustrating a control method of a display device according to an embodiment of the present invention, and referring to fig. 11, the control method includes the following steps:
s210, in the display mode, controlling the first roller and the second roller to drive the first optical film layer to move, and curling the first optical film layer at the position of the first through hole onto the first roller; and controlling the third roller and the fourth roller to drive the second optical film layer to move, and curling the second optical film layer at the position of the second through hole onto the third roller.
S220, in the photographing mode, controlling the first roller and the second roller to drive the first optical film layer to move, and curling part of the first optical film layer onto the second roller; controlling the third roller and the fourth roller to drive the second optical film layer to move, and curling part of the second optical film layer onto the fourth roller; so that the vertical projections of the first through hole and the second through hole on the back plate are overlapped with the opening.
It should be noted that S210 and S220 are not sequentially distinguished, and only control methods corresponding to different functions are implemented. A person skilled in the art can adopt any of the above roller setting modes and correspondingly design a control method to control the rotation direction of the roller, so as to realize the switching between the full-screen display function and the front camera function, which is not described herein again.
Further, referring to fig. 9, the display device 01 further includes an image sensor 50; the vertical projection of the image sensor 50 on the display panel 20 is located within the vertical projection of the opening 111 of the back plate 110 on the display panel 20; the light guide plate 130 includes a first portion 131 and a second portion 132; the first portion 131 is separated from the second portion 132; the perpendicular projection of the second portion 132 on the back plate 110 overlaps the opening 111. Correspondingly, the method for controlling the display device provided by the embodiment of the invention further comprises the following steps: when in a display mode, controlling the image sensor to move to one side of the back plate, which is far away from the display panel; the first part and the second part are positioned on the same plane; and in the photographing mode, the image sensor is controlled to move towards the display panel, so that the second part with at least part of thickness is pushed into the second through hole by the image sensor along the direction vertical to the light-emitting surface of the backlight module.
For example, fig. 9 shows the structure of the display device in the display mode, as shown in fig. 9, in the display mode, the image sensor 50 is located on a side of the back plate 110 facing away from the display panel 20, and the first portion 131 and the second portion 132 are located on the same plane, so that a normal display function can be achieved. Fig. 12 is a schematic structural diagram of the display device according to the embodiment of the invention in the photographing mode, and referring to fig. 12, in the photographing mode, the image sensor 50 pushes the second portion 132 with a partial thickness into the second through hole 141. As shown in fig. 12, when the image sensor 50 is located on the side of the back plate 110 away from the display panel 20, the viewing angle is α, and when the image sensor 50 is closer to the display panel 20, the viewing angle is β, and it can be seen that β > α, therefore, in the control method provided by the embodiment of the present invention, the image sensor 50 is controlled to move toward the display panel 20 in the photographing mode, so that the viewing angle of the image sensor 50 can be increased, the image sensor 50 receives more light, and the control method is favorable for improving the image capturing quality.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (18)
1. A backlight module, comprising:
the back plate, the first optical film layer, the light guide plate and the second optical film layer are stacked;
the light guide plate comprises a first side edge and a second side edge which are opposite; the first side edge is provided with a first rolling shaft and a third rolling shaft; the second side edge is provided with a second rolling shaft and a fourth rolling shaft;
the back plate is provided with an opening; the first optical film layer is provided with a first through hole; the second optical film layer is provided with a second through hole;
in a display mode, the first optical film layer at the position of the first through hole is curled onto the first roller; the second optical film layer at the position of the second through hole is curled to the third roller;
when in a photographing mode, a part of the first optical film layer is curled onto the second roller; a portion of the second optical film layer is rolled onto the fourth roller; the vertical projections of the first through hole and the second through hole on the back plate are overlapped with the opening.
2. A backlight module according to claim 1, wherein the light guide plate comprises a first portion and a second portion; the first portion is separate from the second portion; the vertical projection of the second part on the back plate is overlapped with the opening;
in a display mode, the first part and the second part are positioned on the same plane; in a photographing mode, the second part with at least partial thickness is positioned in the second through hole along the direction vertical to the light-emitting surface of the backlight module.
3. A backlight module according to claim 2, wherein the second portion has a trapezoidal shape; and the surface area of the side of the second part facing the second optical film layer is larger than that of the side of the second part facing away from the second optical film layer.
4. The backlight module of claim 1, further comprising a backlight source; the light guide plate further comprises a third side edge and a fourth side edge which are opposite;
the backlight is disposed at the third side and/or the fourth side.
5. The backlight module of claim 1, further comprising a first driving mechanism and a second driving mechanism; the first driving mechanism is electrically connected with the first rolling shaft and the second rolling shaft respectively; the second driving mechanism is electrically connected with the third roller and the fourth roller respectively.
6. The backlight module as claimed in claim 1, wherein the third roller and the fourth roller are located between the first roller and the second roller.
7. The backlight module as claimed in claim 6, wherein the first roller and the second roller have the same diameter; the diameters of the third roller and the fourth roller are the same; the diameter of the first roller is larger than that of the third roller; the axes of the first roller, the second roller, the third roller and the fourth roller are located on the same plane.
8. The backlight module as claimed in claim 1, wherein the first roller and the second roller are located between the third roller and the fourth roller.
9. The backlight module according to claim 8, wherein the first roller and the second roller have the same diameter; the diameters of the third roller and the fourth roller are the same; the diameter of the first roller is smaller than that of the third roller; the axes of the first roller, the second roller, the third roller and the fourth roller are located on the same plane.
10. The backlight module as claimed in claim 1, wherein the third roller is disposed between the first roller and the second roller; the fourth roller is positioned on one side, away from the first roller, of the second roller;
or, the fourth roller is positioned between the first roller and the second roller; the third roller is positioned on one side of the first roller, which is far away from the second roller.
11. The backlight module according to any of claims 6-10, wherein the first roller and the second roller move in the same direction; the third roller and the fourth roller have the same movement direction; the first roller and the third roller move in opposite directions.
12. The backlight module as claimed in claim 1, wherein the axes of the first roller and the second roller are located on the same plane; the axes of the third roller and the fourth roller are positioned on the same plane; and a space is reserved between the plane where the axes of the first roller and the second roller are located and the plane where the axes of the third roller and the fourth roller are located.
13. The backlight module as claimed in claim 1, further comprising a rubber frame; the rubber frame is arranged around the light guide plate;
the rubber frame on the periphery of the first side edge of the light guide plate is positioned on one side, away from the light guide plate, of the first rolling shaft and the third rolling shaft;
the rubber frame on the periphery of the second side edge of the light guide plate is positioned on one side, away from the light guide plate, of the second rolling shaft and the fourth rolling shaft.
14. A display device, comprising: a display panel and a backlight module according to any one of claims 1-13; the backlight module is used for providing backlight for the display panel.
15. The display device according to claim 14, further comprising a light-shielding glue; the shading glue is positioned on one side of the display panel facing the backlight module; the vertical projection of the light shading glue on the plane where the light guide plate is located is not overlapped with the light guide plate.
16. The display device according to claim 15, further comprising a lubricating layer; the lubricating layer is coated on one side, facing the backlight module, of the shading glue; the vertical projection of the lubricating layer on the plane of the display panel is positioned in the vertical projection of the shading glue on the plane of the display panel.
17. A control method of a display device, which is applied to the display device according to any one of claims 14 to 16, comprising:
in a display mode, controlling a first roller and a second roller to drive a first optical film layer to move, and curling the first optical film layer at the position of a first through hole onto the first roller; controlling a third roller and a fourth roller to drive a second optical film layer to move, and curling the second optical film layer at the position of a second through hole onto the third roller;
in a photographing mode, controlling a first roller and a second roller to drive the first optical film layer to move, and curling part of the first optical film layer onto the second roller; controlling a third roller and a fourth roller to drive the second optical film layer to move, and curling part of the second optical film layer onto the fourth roller; so that the vertical projections of the first through hole and the second through hole on the back plate are overlapped with the opening.
18. The method of claim 17, wherein the display device further comprises an image sensor; the vertical projection of the image sensor on the display panel is positioned in the vertical projection of the opening of the back plate on the display panel; the light guide plate comprises a first part and a second part; the first portion is separate from the second portion; the vertical projection of the second part on the back plate is overlapped with the opening;
when in a display mode, controlling the image sensor to move to one side of the back plate departing from the display panel; the first portion and the second portion are located on the same plane;
and in a photographing mode, the image sensor is controlled to move towards the display panel, so that the image sensor pushes the second part with at least partial thickness into the second through hole along a direction perpendicular to the light emergent surface of the backlight module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010711773.6A CN111880334B (en) | 2020-07-22 | 2020-07-22 | Backlight module, display device and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010711773.6A CN111880334B (en) | 2020-07-22 | 2020-07-22 | Backlight module, display device and control method thereof |
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| CN111880334B true CN111880334B (en) | 2022-06-07 |
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| JP2003294945A (en) * | 2002-04-02 | 2003-10-15 | Konica Corp | Optical film, method for manufacturing the same, and polarizing plate and display device using the same |
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| EP3486561A2 (en) * | 2017-11-20 | 2019-05-22 | Beijing Xiaomi Mobile Software Co., Ltd. | Backlight module and display device |
| CN110715237A (en) * | 2018-07-13 | 2020-01-21 | 杭州昌松光学有限公司 | Portable eye-protecting desk lamp with foldable light-emitting surface |
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| CN111880334A (en) | 2020-11-03 |
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