CN110189628B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN110189628B CN110189628B CN201910577317.4A CN201910577317A CN110189628B CN 110189628 B CN110189628 B CN 110189628B CN 201910577317 A CN201910577317 A CN 201910577317A CN 110189628 B CN110189628 B CN 110189628B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
Abstract
The invention provides a backlight module and a display device, and belongs to the technical field of display. The invention provides a backlight module which comprises a first substrate, a peep-proof groove and a first light-emitting device, wherein the peep-proof groove is arranged on the first substrate, and the first light-emitting device is arranged in the peep-proof groove; the peep-proof groove is provided with a plurality of side faces, each side face is opposite to a plane where the first substrate is located, a first preset included angle is formed, the included angle is met, and light emitted by the first light-emitting device can be limited in a preset visual angle range to be emitted. According to the invention, the side surface of the peep-proof groove is utilized to limit the light emitted by the first light-emitting device within the visual angle range, so that people outside the visual angle range cannot receive the light emitted by the first light-emitting device, and the peep-proof function is realized.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a backlight module and a display device.
Background
With the development of science and technology, display devices such as mobile phones, notebooks, tablet computers and the like are increasingly widely popularized and applied. When people use these display devices in public, for example, the display devices are used to log in accounts, read documents, reply messages, etc., the information displayed on the display devices may be seen by others, so that the privacy of the users is not protected.
Disclosure of Invention
The present invention is directed to at least solve one of the technical problems in the prior art, and provides a backlight module and a display device, which utilize the side surface of the peep-proof groove to limit the light emitted from the first light-emitting device within the visible angle range, so that people outside the visible angle range cannot receive the light emitted from the first light-emitting device, thereby implementing the peep-proof function.
The technical scheme adopted for solving the technical problem of the invention is a backlight module, which comprises:
a first substrate;
a peep-proof slot disposed on the first substrate and having a plurality of side surfaces; the side face has a first preset included angle relative to the plane where the first substrate is located;
the first light-emitting device is arranged in the peep-proof groove; wherein the content of the first and second substances,
the first preset included angle meets the requirement that light emitted by the first light-emitting device can be limited within a preset visible angle range to be emitted.
According to the backlight module provided by the invention, the peep-proof groove is formed in the first substrate, the side surface of the peep-proof groove is obliquely arranged relative to the plane of the first substrate, and the first light-emitting device is arranged in the peep-proof groove, so that the light emitted by the first light-emitting device can be limited within the visible angle range by the side surface of the peep-proof groove for emitting, and people outside the visible angle range cannot receive the light emitted by the first light-emitting device, and the peep-proof function is realized.
Preferably, the first preset included angle satisfies that the light irradiated to the side surface of the peep-proof groove at the largest visual angle within the visual angle range from the light emitted by the first light-emitting device can be emitted along the direction perpendicular to the plane where the first substrate is located.
Preferably, the depth H of the peep-proof slot is determined according to the following formula:
wherein θ is the angle of the maximum viewing angle, α is the first preset included angle, Y is the height of the first light emitting device, and X is the width of the first light emitting device.
Preferably, a reflective film is disposed on a side surface of the peep-proof slot, for reflecting light emitted by the first light-emitting device.
Preferably, the material of the reflective film comprises a poly-p-phenylene terephthaiic plastic.
Preferably, the first substrate serves as a bottom surface of the peep-proof slot; the side surfaces comprise a first side surface and a second side surface which are oppositely arranged, and the first side surface, the second side surface and the first substrate define the peep-proof groove.
Preferably, the first substrate serves as a bottom surface of the peep-proof slot; the side surfaces comprise a first side surface and a second side surface which are oppositely arranged, and a third side surface and a fourth side surface which are oppositely arranged, and the first side surface, the second side surface, the third side surface, the fourth side surface and the first substrate define the peep-proof slot.
Preferably, the backlight module further includes:
a second light emitting device;
a plane is connected between the peep-proof grooves, and the second light-emitting device is arranged on the plane.
Preferably, the backlight module further includes:
a second light emitting device disposed on the first substrate;
the first substrate is also provided with a limiting groove which is arranged in the same layer with the peep-proof groove;
the second light emitting device is located in the limiting groove.
Preferably, the first light emitting devices and the second light emitting devices are alternately arranged, and an orthographic projection of the second light emitting devices on the first substrate has no overlapping region with an orthographic projection of the peep-preventing groove on the first substrate.
Preferably, the backlight module further includes: a peep-proof switch and a normal switch;
the peep-proof state switch is connected with the first light-emitting device;
the normal state switch is connected to the second light emitting device.
Correspondingly, the invention provides a display device, which comprises any one of the backlight module and the display panel.
Drawings
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view of the backlight module shown in FIG. 1 taken along the direction A-A';
fig. 3 is a schematic structural view of a peep-proof slot in the backlight module provided by the present invention;
fig. 4 is a schematic diagram of a light emitting path of a first light emitting device in the backlight module according to the present invention;
FIG. 5 is a geometric relationship between the groove depth of the peep-proof groove in the backlight module and the emergent light;
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 present invention;
FIG. 8 is a cross-sectional view of the backlight module shown in FIG. 6 taken along the direction B-B';
fig. 9 is a schematic structural diagram of another embodiment of a backlight module provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
Example 1:
as shown in fig. 1, 2 and 3, the present embodiment provides a backlight module, which includes: a first substrate 01, a peep prevention groove 02, and a first light emitting device 03.
Fig. 1 isbase:Sub>A schematic structural diagram of the backlight module provided in this embodiment, fig. 2 isbase:Sub>A cross-sectional view of the backlight module shown in fig. 1 taken alongbase:Sub>A directionbase:Sub>A-base:Sub>A', and fig. 3 isbase:Sub>A schematic structural diagram of the peep-proof slot in fig. 2. The peep-proof groove 02 is disposed on the first substrate 01, and the first light emitting device 03 is disposed in the peep-proof groove 02. The peep-proof slot 02 has a plurality of side surfaces 021, each side surface 021 has a first preset included angle α relative to the plane where the first base 01 is located, and the first preset included angle α satisfies: the light emitted from the first light emitting device 03 can be emitted within a predetermined visible angle range a 1.
The above-mentioned visible angle range a1 is a range formed by taking a direction perpendicular to the plane of the first substrate 01 as a center line and deviating from the center line by an angle θ, i.e., the angle range of the visible angle range a1 is [ - θ, + θ ], and the angle θ is the maximum visible angle. It can also be said that, taking the direction in which the line of sight faces the first substrate 01 as the center, if the angle of deviation of the line of sight from the center to the left or the right is smaller than or equal to the angle θ (i.e. the viewing angle), the human eye can receive the light emitted by the first light-emitting device 03; if the angle of the line of sight deviating to the left or right from the center is greater than the angle θ, the human eye cannot receive the light emitted by the first light emitting device 03. The visual angle range a1 can be preset according to the peep-proof requirement.
In the backlight module provided by this embodiment, the peep-proof groove 02 is formed in the first substrate 01, the side surface 021 of the peep-proof groove 02 is inclined relative to the plane of the first substrate 01, and the first light-emitting device 03 is arranged in the peep-proof groove 02, so that the side surface 021 of the peep-proof groove 02 can limit the light emitted by the first light-emitting device 03 in the visible angle range a1 for emission, and thus people outside the visible angle range cannot receive the light emitted by the first light-emitting device 03, that is, cannot view a display picture, and thus the peep-proof function is realized.
It should be noted that, in the backlight module provided in this embodiment, the first Light Emitting device 03 includes a Light Emitting Diode (LED), and the first Light Emitting device 03 may be any type of LED, such as a Micro LED (Micro LED) or a sub-millimeter LED (Mini LED). If the first light emitting device 03 is a Micro LED, the first substrate 01 may be a driving substrate; if the first light emitting device 03 is a Mini LED, the first substrate 01 may be a Printed Circuit Board (PCB). Of course, the first light emitting device 03 may also be another type of light emitting device as long as the principle of the present embodiment is satisfied, and is not limited herein.
Optionally, as shown in fig. 2 and fig. 3, in the backlight module provided in this embodiment, a side surface 021 of the peep-proof groove 02 has a first predetermined included angle α with respect to a plane of the first substrate 01. The first preset included angle α satisfies that the light emitted by the first light-emitting device 03 can be emitted in a direction perpendicular to the plane of the first substrate 01 by irradiating the light onto the side 021 of the peep-prevention groove 02 at the maximum visual angle θ within the visual angle range a 1.
Referring to fig. 4, a range between L1 "and L2" is a visible angle range a 1. L1 and L2 are light rays irradiated onto the side surface 021 of the peep-proof slot 02 along the maximum visual angle θ in the light emitted by the first light-emitting device 03, and the light rays L1 and L2 are reflected by the side surface 021 of the peep-proof slot 02 and emitted in a direction perpendicular to the plane of the first substrate 01 (i.e., the emitted light rays L1 'and L2' in fig. 2). As can be seen from fig. 4 and the principle of light reflection, among the light emitted by the first light emitting device 03, the light with the exit angle smaller than the maximum visual angle θ does not irradiate the side surface 021 of the peep-proof slot 02, and exits along the original light path; the light with the exit angle larger than the maximum viewing angle θ is limited by the side 021 of the peep-proof slot 02 within the viewing angle range a1 for exiting. For example, in fig. 4, the light L3 emitted by the first light-emitting device 03 has an outgoing angle larger than the maximum viewing angle θ, the light L3 irradiates the side surface 021 of the peep-preventing groove 02 and is reflected to exit along the direction of L3', the angle of the outgoing light L3' relative to the direction perpendicular to the plane of the first substrate 01 is larger than the angle of the light L1 'relative to the direction perpendicular to the plane of the first substrate 01, but is not larger than the angle of L1 ″ relative to the direction perpendicular to the plane of the first substrate 01, that is, the outgoing light L3' does not exceed the viewing angle range a 1. By analogy, the first preset included angle α of the side surface 021 of the peep-proof groove 02 relative to the plane of the first base 01 can be satisfied, and light rays which are irradiated onto the side surface 021 of the peep-proof groove 02 at the maximum visual angle θ within the visual angle range a1 can be emitted from the light rays emitted by the first light-emitting device 03 in the direction perpendicular to the plane of the first base 01, so that the light rays emitted by the first light-emitting device 03 can be limited by the side surface 021 of the peep-proof groove 02 to be emitted within the preset visual angle range a1, and further, people outside the visual angle range a1 can not receive the light emitted by the first light-emitting device 03, and the peep-proof effect can be achieved.
Further, referring to fig. 4, in the backlight module provided in this embodiment, as the first preset included angle α is described above, the angle of the first preset included angle α may be determined as follows:
first, the direction of the light L2 emitted from the first light emitting device 03 and the direction of the outgoing light L2' of the light L2 reflected by the side surface 021 of the peep-preventing groove 02 are determined. The direction of L2 is a direction of emitting light at an angle of the maximum viewing angle θ, and the direction of L2' is a direction perpendicular to the plane of the first substrate 01.
Next, a center line c2 of the light L2 and the light L2 'is formed, where the center line c2 forms an angle β 1 with the light L2, the center line c2 forms an angle β 2 with the light L2', and β 1= β 2.
Finally, a solid line c3 perpendicular to the center line c2 is drawn, and an included angle between the solid line c3 and the plane of the first substrate 01 is the first preset included angle α.
If the side 021 of the peep-proof slot 02 is set along the solid line c3, the central line c2 is the normal between the incident angle and the reflection angle of the light L2 and the light L2' reflected on the side 021 of the peep-proof slot 02, so that the angle of the first preset included angle α can be determined. Of course, the angle of the first preset included angle α may also be determined by other methods, as long as the principle of the embodiment is met, and the method is not limited herein.
Optionally, as shown in fig. 5, in the backlight module provided in this embodiment, as described above, after the angle of the first preset included angle α between the side surface 021 of the peep-proof groove 02 and the plane of the first substrate 01 is set, the depth H of the peep-proof groove 02 needs to be determined. If the depth of the peep-proof groove 02 is too deep, the overall thickness of the backlight module is increased; if the depth of the peep-proof groove 02 is not enough, the light emitted from the light emitting surface of the first light emitting device 03 cannot be limited within the visible angle range a1, and therefore, if the width of the first light emitting device 03 is X and the height of the first light emitting device 03 is Y, the depth H of the peep-proof groove 02 should be greater than Y, and the side surface 021 of the peep-proof groove 02 is at the highest position from the plane of the first substrate 01, the light L1, which is emitted from the midpoint of the light emitting surface of the first light emitting device 03 and is irradiated onto the side surface 021 of the peep-proof groove 02 at the largest visible angle θ within the visible angle range a1, can be emitted in the direction perpendicular to the plane of the first substrate 01 (i.e., the light L1').
Specifically, according to the foregoing description, the geometrical relationship among the light L1, the outgoing light L1', the peep-preventing groove 02, the first substrate 01 and the first light-emitting device 03 is shown in fig. 5, and for better illustration, three dotted lines are taken as auxiliary lines in fig. 5 and form a rectangle with the upper surface of the first substrate 01. As can be derived from the tangent function of,
while
H = H-Y; thus, the depth H of the peep-proof slot 02 can be determined according to the following formula:
wherein θ is the angle of the maximum viewing angle, α is a first preset included angle, Y is the height of the first light emitting device, and X is the width of the first light emitting device. Of course, the depth H of the peep-proof slot 02 may be determined in other manners as long as the principle of the present embodiment is met, and is not limited herein.
Optionally, as shown in fig. 2, a side 021 of the peep preventing groove 02 is provided with a reflective film 022 for reflecting light emitted from the first light emitting device 03.
Alternatively, the material of the reflective film includes a poly (ethylene Terephthalate) (PET), and of course, the reflective film may be another type of material as long as the reflective film can reflect light emitted from the first light-emitting device 03 to the side surface 021 of the peep-preventing groove 02 without affecting the light-emitting rate of the first light-emitting device 03, and the reflective film is not limited herein.
Optionally, as shown in fig. 6 and 7, in the backlight module provided in this embodiment, the side surface 021 of the peep-proof groove 02 may be disposed according to a peep-proof direction as required, so as to limit light emitted by the first light-emitting device 03 to the corresponding direction within a preset visible angle range for emission. The following examples are given.
First, as shown in fig. 6, in the backlight module provided in this embodiment, if peeping is required to be performed on two opposite light-emitting directions of the first light-emitting device 03, the first substrate 01 may be used as a bottom surface of the peeping-preventing groove 02, and two opposite side surfaces 021 of the peeping-preventing groove 02, such as the first side surface 0211 and the second side surface 0212 shown in fig. 6, are disposed. The first side surface 0211, the second side surface 0212 and the bottom surface of the first substrate 01 define a peep-proof groove 02, and the first side surface 0211, the second side surface 0212 and the plane of the first substrate 01 have a first preset included angle α. The first light emitting device 03 is disposed in the peep-proof groove 02 and located between the first side surface 0211 and the second side surface 0212, and the first side surface 0211 and the second side surface 0212 can limit light rays emitted by the first light emitting device 03 to the first side surface 0211 and the second side surface 0212 of the peep-proof groove 02 to exit within a preset visual angle range a1, so that a peep-proof function in a direction corresponding to the first side surface 0211 and the second side surface 0212 is realized.
Second, as shown in fig. 7, in the backlight module provided in this embodiment, if peeping prevention is required to be performed on all four light emitting directions of the first light emitting device 03, the first substrate 01 may be used as a bottom surface of the peeping prevention groove 02, and two sets of side surfaces 021 of the peeping prevention groove 02, such as the first side surface 0211, the second side surface 0212, the third side surface 0213 and the fourth side surface 0214 shown in fig. 6, which are opposite to each other, are disposed. Wherein, the first side 0211 is opposite to the second side 0212, and the third side 0213 is opposite to the fourth side 0214. The first side 0211, the second side 0212, the third side 0213, the fourth side 0214 and the bottom surface of the first substrate 01 define the peep-preventing groove 02, and the first side 0211, the second side 0212, the third side 0213, the fourth side 0214 and the plane of the first substrate 01 have a first preset included angle α. The first light emitting device 03 is disposed in the peep-proof groove 02, the first side surface 0211, the second side surface 0212, the third side surface 0213 and the fourth side surface 0214 are disposed around the first light emitting device 03, and the first to fourth side surfaces can irradiate light rays emitted by the first light emitting device 03 onto the first to fourth side surfaces of the peep-proof groove 02, and the light rays are limited within a preset visual angle range a1 to be emitted, so that the peep-proof function of the first light emitting device 03 in four light emitting directions is achieved.
It should be noted that the two manners are only illustrative of the manner of disposing the side 021 of the peep-proof slot 02, and are not limited thereto, and in a specific application, the side 021 of the peep-proof slot 02 may be disposed in any direction according to the peep-proof requirement.
Moreover, it should be noted that the bottom surface of the peep-proof groove 02 may not be the first substrate 01, for example, a layer-by-layer structure may be added as the bottom surface of the peep-proof groove 02, and the peep-proof groove 02 is defined by the side surface 021 of the peep-proof groove 02.
Optionally, as shown in fig. 1, the backlight module provided in this embodiment may further include a plurality of second light emitting devices 04, where the second light emitting devices 04 are used for displaying a normal state, that is, when the second light emitting devices 04 are in a light emitting state, a person outside the visible angle range a1 may also receive light emitted by the second light emitting devices 04.
It should be noted that in the backlight module provided in this embodiment, the second Light Emitting device 04 includes a Light Emitting Diode (LED), and the second Light Emitting device 04 may be any type of LED, such as a Micro LED (Micro LED) or a sub-millimeter LED (Mini LED).
Optionally, referring to fig. 1 and fig. 2, in the backlight module provided in this embodiment, a plane is connected between the peep-proof slots 02, the second light emitting device 04 may be disposed on the plane, and when the second light emitting device 04 is in a light emitting state, people located within a light emitting angle range of the second light emitting device 04 may all receive light emitted by the second light emitting device 04.
Optionally, as shown in fig. 6 and 8, fig. 8 is a cross-sectional view of the backlight module shown in fig. 6 cut along a direction B-B', in the backlight module provided in this embodiment, the second light emitting device 04 may also be disposed on the first substrate 01, and the first substrate 01 is further provided with a limiting groove 05 disposed on the same layer as the peep-proof groove 02. The second light emitting device 04 is located in the stopper groove 05. In the process of manufacturing the backlight module, when the second light emitting device 04 is transferred to the first substrate 01 but is not cured, the second light emitting device 04 is limited in the limiting groove 05 through the limiting groove 05, and the position of the second light emitting device 04 on the first substrate 01 is prevented from being displaced.
Correspondingly, the peep-proof groove 02 arranged on the first substrate 01 can limit the first light-emitting device 03 arranged in the peep-proof groove 02 while realizing the peep-proof function, and when the first light-emitting device 03 is transferred onto the first substrate 01 but is not cured in the process of manufacturing the backlight module, the first light-emitting device 03 is limited in the peep-proof groove 02 through the peep-proof groove 02 to prevent the position of the first light-emitting device 03 on the first substrate 01 from being displaced.
Optionally, referring to fig. 6 and 7, in the backlight module provided in this embodiment, the limiting groove 05 includes a plurality of side surfaces 051, and the side surfaces 051 of the limiting groove 05 may be arranged according to the requirement of the limiting direction or the requirement of the process for manufacturing the backlight module. For example, as shown in fig. 6, a fifth side 0511 and a sixth side 0512 of two opposite limiting grooves 05 are provided, and the fifth side 0511, the sixth side 0512 and the bottom surface of the first substrate 01 define the limiting grooves 05 to prevent the second light emitting devices 04 from being displaced in the direction corresponding to the fifth side 0511 and the sixth side 0512. For another example, as shown in fig. 7, two sets of side surfaces 051 of the limiting groove 05 may be arranged oppositely, a fifth side surface 0511 and a sixth side surface 0512 are arranged oppositely, and a seventh side surface 0513 and an eighth side surface 0514 are arranged oppositely. The fifth side 0511, the sixth side 0512, the seventh side 0513, the eighth side 0514 and the bottom surface of the first substrate 01 define a limiting groove 05 to prevent the position of the second light emitting device 04 on the first substrate 05 from being displaced. Of course, the side 051 of the stopper groove 05 may be provided in other forms, and the above description is only for the way of providing the side 051 of the stopper groove 05, and is not limited thereto.
Optionally, referring to fig. 8, each side 051 of the limiting groove 05 has a second preset included angle ω with the plane of the first substrate 01, and the second preset included angle ω should be smaller than the first preset included angle α, so that light emitted by the second light emitting device 04 can be emitted out of the visible angle range a1, and thus people outside the visible angle range a1 can receive the light emitted by the second light emitting device 04.
Optionally, in the backlight module provided in this embodiment, the light emitting state of the backlight module includes a normal state and a peep-proof state, the first light emitting device 03 is used for displaying in the peep-proof state, and the second light emitting device 04 is used for displaying in the normal state. When the light emitting device 03 is in the peep-proof state, the first light emitting device 03 is in the light emitting state, the second light emitting device 04 is in the extinguishing state, light emitted by the first light emitting device 03 is limited in the preset visual angle range a1 through the peep-proof groove to be emitted, people outside the visual angle range a1 cannot receive the light emitted by the first light emitting device 03, and therefore the peep-proof function is achieved; when the second light-emitting device 04 is in a light-emitting state, the first light-emitting device 03 can emit light or can be extinguished, and the second light-emitting device 04 is arranged on a plane between the two peep-proof grooves 02 or in the limiting groove 05, and a second preset included angle ω formed by the side surface 051 of the limiting groove 05 and the plane where the first substrate 01 is located is smaller than a first preset included angle α formed by the side surface 021 of the peep-proof groove 02 and the plane where the first substrate 01 is located, so that light emitted by the second light-emitting device 04 can be emitted out of the visible angle range a1, and people outside the visible angle range a1 can receive the light emitted by the second light-emitting device 04.
If the backlight module is applied to the display device, when the display device is in the peep-proof state, people outside the visual angle range a1 cannot see the content displayed by the display device, so that the peep-proof effect is achieved; when the display device is in a normal state, the content displayed by the display device can be seen by people outside the visual angle range a1, namely, the content displayed by the display panel of the display device can be shared with other people.
Optionally, in the backlight module provided in this embodiment, the first light emitting devices 03 and the second light emitting devices 04 are alternately arranged, so that light emitted by the first light emitting devices 03 can be uniformly displayed in the peep-proof state, and light emitted by the second light emitting devices 04 can be uniformly displayed in the normal state. Moreover, the orthographic projection of the second light-emitting device 04 on the first substrate 01 has no overlapping region with the orthographic projection of the peep-preventing groove 02 on the first substrate 01, that is, the second light-emitting device 04 is arranged outside the peep-preventing groove 02 so that the light emitted by the second light-emitting device is not limited by the peep-preventing groove 02.
Further, the first light emitting device 03 and the second light emitting device 04 may be alternately disposed in different manners as long as light emitted from the first light emitting device 03 and the second light emitting device 04 can be uniformly displayed. For example, as shown in fig. 6 and 7, the first light emitting devices 03 and the second light emitting devices 04 may be alternately arranged in columns or rows, that is, alternately arranged in such a manner that one column (or one row) of the first light emitting devices 03 is spaced apart from one column (or one row) of the second light emitting devices 04. For another example, as shown in fig. 9, one first light emitting device 03 and one second light emitting device 04 may be alternately arranged to be spaced apart from each other.
Optionally, the backlight module provided in this embodiment further includes: a peep-proof switch and a normal switch. The peep-proof switch is connected with the first light emitting device 03, and the normal switch is connected with the second light emitting device 04. The peep-proof switch can control the first light-emitting device 03 to emit light, so that the second light-emitting device 04 is in an off state, and the normal switch can control the second light-emitting device 04 to emit light. Through setting up peep-proof state switch and normal attitude switch, make the backlight unit that this embodiment provided switch between peep-proof state and normal attitude, when above-mentioned backlight unit was used in display device, the user can switch between peep-proof state and normal attitude as required to whether the selection shares the content that display device shows that uses to other people, increased the convenience of using display device.
Optionally, if the backlight module provided in this embodiment is applied to a display device, the normal state switch and the peep-proof state switch may be physical switches, and are installed on the display device, or may be virtual touch switches, and the display state is switched by clicking the normal state switch or the peep-proof state switch at a corresponding touch position on a display panel of the display device.
Optionally, the backlight module provided in this embodiment includes a direct type backlight module.
Example 2:
the embodiment further provides a display device, which includes the backlight module and the display panel provided in embodiment 1.
The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
Alternatively, in the display apparatus provided in this embodiment, the distance between the two light emitting devices is designed according to the width of the first light emitting device 03, the width of the second light emitting device 04, the required brightness of the display apparatus, and the size of the display panel, as long as the principle of this embodiment is met, and is not limited herein.
In summary, in the backlight module provided by the present invention, the peep-proof groove 02 is disposed on the first substrate 01, the side surface 021 of the peep-proof groove 02 is disposed in an inclined manner with respect to the plane of the first substrate 01, and the first light-emitting device 03 is disposed in the peep-proof groove 02, so that the side surface 021 of the peep-proof groove 02 can limit the light emitted by the first light-emitting device 03 within the visible angle range a1 for emitting, and thus people outside the visible angle range a1 cannot receive the light emitted by the first light-emitting device 03, thereby implementing the peep-proof function.
It will be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention, and such modifications and improvements are also considered to be within the scope of the invention.
Claims (8)
1. A backlight module, comprising:
a first substrate;
a peep-proof slot disposed on the first substrate and having a plurality of side surfaces; the side face has a first preset included angle relative to the plane where the first substrate is located;
the first light-emitting device is arranged in the peep-proof groove; each first light-emitting device is arranged in one peep-proof groove, and different first light-emitting devices are arranged in different peep-proof grooves;
the first preset included angle is satisfied, and light emitted by the first light-emitting device can be limited within a preset visual angle range for emitting;
the first light-emitting device is a miniature light-emitting diode;
the first substrate is used as the bottom surface of the peep-proof groove; the side surfaces comprise a first side surface and a second side surface which are oppositely arranged, and a third side surface and a fourth side surface which are oppositely arranged, and the first side surface, the second side surface, the third side surface, the fourth side surface and the first substrate define the peep-proof slot;
further comprising: a second light emitting device disposed on the first substrate; the first substrate is also provided with a limiting groove which is arranged in the same layer with the peep-proof groove; each of the second light emitting devices is located in one of the limiting grooves, different ones of the second light emitting devices are disposed in different ones of the limiting grooves, and a plurality of side surfaces of the limiting grooves include: the first substrate is provided with a first side face and a second side face, the first side face and the second side face are opposite, the seventh side face and the eighth side face are opposite, the limiting groove is limited by the fifth side face, the sixth side face, the seventh side face, the eighth side face and the bottom face, each side face of the limiting groove and a plane where the first substrate is located are provided with a second preset included angle, and the second preset included angle is smaller than the first preset included angle.
2. The backlight module according to claim 1, wherein the first predetermined included angle satisfies a requirement that light emitted from the first light emitting device, which is irradiated onto the side surface of the peep-proof slot at a maximum visual angle within the visual angle range, is emitted along a direction perpendicular to a plane where the first substrate is located.
3. The backlight module according to claim 2, wherein the depth H of the peep-proof slot is determined according to the following formula:
wherein θ is the angle of the maximum viewing angle, α is the first preset included angle, Y is the height of the first light emitting device, and X is the width of the first light emitting device.
4. The backlight module according to claim 1, wherein a reflective film is disposed on a side surface of the peep-proof groove for reflecting light emitted from the first light-emitting device.
5. A backlight module according to claim 4, wherein the material of the reflective film comprises a poly-p-phenylene terephtalate plastic.
6. The backlight module according to claim 1, wherein the first light emitting devices and the second light emitting devices are alternately arranged, and an orthographic projection of the second light emitting devices on the first substrate has no overlapping region with an orthographic projection of the peep preventing groove on the first substrate.
7. The backlight module according to claim 1, further comprising: a peep-proof switch and a normal switch;
the peep-proof state switch is connected with the first light-emitting device;
the normal state switch is connected with the second light emitting device.
8. A display device, comprising the backlight module and the display panel of any one of claims 1-7.
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| CN111474747A (en) * | 2020-04-20 | 2020-07-31 | 京东方科技集团股份有限公司 | Backlight module, driving method thereof and display device |
| CN111458923B (en) * | 2020-05-14 | 2023-06-02 | 京东方科技集团股份有限公司 | Peep-proof film and display device |
| CN113359349A (en) * | 2021-06-02 | 2021-09-07 | 深圳市华星光电半导体显示技术有限公司 | Backlight module and display device |
| CN114613284B (en) * | 2022-03-01 | 2023-11-21 | 厦门天马微电子有限公司 | Display panel and display device |
| CN117218943A (en) * | 2022-06-02 | 2023-12-12 | 群创光电股份有限公司 | display device |
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