CN216748368U - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN216748368U CN216748368U CN202123387278.3U CN202123387278U CN216748368U CN 216748368 U CN216748368 U CN 216748368U CN 202123387278 U CN202123387278 U CN 202123387278U CN 216748368 U CN216748368 U CN 216748368U
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Abstract
The embodiment of the utility model discloses a backlight module and a display device, wherein the backlight module comprises a back plate; the first lamp panel is arranged on one side of the backboard, and a plurality of first light sources are arranged on the first lamp panel at intervals; the reflector plate is positioned on one side, far away from the back plate, of the first lamp panel and comprises a plurality of reflection structures, two adjacent and non-contact reflection structures form a reflection unit with a parabolic structure, a first light source is arranged on the bottom of the reflection unit, and the first light source is configured to emit light in a wide view angle mode; the second lamp panel is arranged on one side, away from the backboard, of the reflector plate, and a plurality of second light sources are arranged on the second lamp panel and are configured to emit light in a narrow viewing angle mode; the second light source is disposed on a focal point of the reflection unit. The technical scheme provided by the embodiment of the utility model can realize free switching of wide and narrow visual angles, meet the requirements of peep prevention and sharing, improve the uniformity of the brightness of the emergent light in a narrow visual angle mode and prevent the phenomenon of LED Mura.
Description
Technical Field
The embodiment of the utility model relates to the technical field of display, in particular to a backlight module and a display device.
Background
A Liquid Crystal Display (LCD) panel has the advantages of good picture quality, small volume, light weight, low power consumption, low cost, and the like, and is widely applied to the field of flat panel display.
In order to meet the privacy protection requirements of people, the liquid crystal display panel is developing towards the direction of having wide and narrow viewing angle switching ability, and when a user needs to share information, a wide viewing angle mode is opened; when the user wants to protect the displayed information, the narrow viewing angle mode is used. In the prior art, the switching of the wide and narrow viewing angles is usually realized by adopting a double-liquid-crystal-box mode or a double-backlight-module mode, but the problem of poor light-shrinking performance of the backlight module exists, so that the peep-proof performance is unsatisfactory, the phenomenon of LED Mura is easily caused when a white-light picture is displayed, and the display effect is reduced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a backlight module and a display device, which are used for improving the light shrinkage performance of the backlight module and improving the display effect.
In a first aspect, an embodiment of the present invention provides a backlight module, including:
a back plate;
the first lamp panel is arranged on one side of the backboard, and a plurality of first light sources are arranged on the first lamp panel at intervals;
the reflector plate is positioned on one side, far away from the backboard, of the first lamp panel and comprises a plurality of reflection structures, two adjacent and non-contact reflection structures form a reflection unit with a parabolic structure, a first light source is arranged on the bottom of the reflection unit, and the first light source is configured to emit light in a wide view angle mode;
the second lamp panel is arranged on one side, away from the backboard, of the reflector plate, a plurality of second light sources are arranged on the second lamp panel at intervals, and the second light sources are configured to emit light in a narrow viewing angle mode; wherein the second light source is disposed on a focal point of the reflection unit.
Optionally, the plurality of second light sources are disposed on the second lamp panel at equal intervals, and along the thickness direction of the backlight module, the vertical distance from the second light sources to the back panel is greater than the vertical distance from the highest point of the reflector plate to the back panel.
Optionally, follow the extending direction of second lamp plate, adjacent two perpendicular distance D between the second light source satisfies:
and P is the vertical distance between the second light source and the first lamp panel in the thickness direction of the backlight module, and theta is the light-emitting angle of the second light source.
Optionally, a bottom size of the reflection unit is smaller than an opening size of the reflection unit.
Optionally, a perpendicular projection of the first light source on the back plate overlaps with a perpendicular projection of the second light source on the back plate.
Optionally, the backlight module further includes frame glue, and the frame glue is located on two sides of the second lamp panel along the extending direction of the second lamp panel and is used for supporting the second lamp panel.
Optionally, the second light source is further configured to emit light in a wide viewing angle mode.
Optionally, the backlight module further includes a diffusion sheet, and the diffusion sheet is located on one side, far away from the back plate, of the second lamp panel.
In a second aspect, an embodiment of the present invention further provides a display device, where the display device includes the backlight module provided in any embodiment of the present invention, and a display panel disposed on a light exit side of the backlight module.
Optionally, the display device further includes a plurality of driving modules disposed on the driving board, and the first lamp panel and the second lamp panel are connected to the corresponding driving modules through flexible circuit boards respectively.
According to the technical scheme provided by the embodiment of the utility model, the double lamp panels and the parabolic reflector plate structure are adopted, the first light source on the first lamp panel is configured to emit light in a wide view angle mode, and the second light source on the second lamp panel is configured to emit light in a narrow view angle mode, so that the wide and narrow view angles can be freely switched, and the requirements of peeping prevention and sharing can be met. In this embodiment, the reflector plate is located first lamp plate and keeps away from backplate one side, the reflector plate includes a plurality of reflection configuration, adjacent and two noncontacting reflection configuration form parabolic structure's reflection unit, first light source is located reflection unit's bottom, the second light source is located reflection unit's focus, so that the light that the second light source sent all jets out along reflection unit's axis direction after passing through reflection unit reflection, play the effect of shrink backlight unit's visual angle, can improve the homogeneity of light-emitting luminance under the narrow visual angle mode simultaneously, prevent the phenomenon of LED Mura.
Drawings
FIG. 1 is a graph of a relationship between a backlight viewing angle and a luminance in the prior art;
fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;
FIG. 3 is a diagram of an optical path of a light source under a wide viewing angle mode according to an embodiment of the present invention;
FIG. 4 is a diagram of an optical path of a light source in a narrow viewing angle mode according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another backlight module according to an embodiment of the utility model;
FIG. 6 is a parabolic graph according to an embodiment of the present invention;
FIG. 7 is a diagram of an optical path of a light source under another wide view angle mode according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another backlight module according to an embodiment of the utility model;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a driving system in a display device according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a driving system in another display device 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 utility model and are not limiting of the utility model. 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 graph of a relationship between a Viewing Angle and luminance of a backlight according to a related art, and referring to fig. 1, wherein a dotted line represents a relationship between a direct type backlight Viewing Angle and luminance, and a solid line represents a relationship between a Hybrid Viewing Angle (HVA) and luminance. To straight following formula backlight unit, including the lamp plate usually and the optical film material that sets up on this lamp plate, be provided with a plurality of luminescence units on the lamp plate, like LED, the light that luminescence unit sent can evenly penetrate through the optical film material. However, the direct type backlight module has no good light shrinking tool after the LEDs emit light, and can still see the display image under a large viewing angle, which is not beneficial to switching for peep prevention. In the HVA technique, a bias voltage is usually applied to the viewing angle control electrode, so that the liquid crystal molecules tilt up to form large viewing angle light leakage, thereby achieving the anti-peeping effect. When the backlight viewing angle is 35 °, the luminance is only 0.2 (normalized value), and when the backlight viewing angle is 0 °, the luminance is 1, that is, in the privacy mode, the luminance difference is large, the LED Mura phenomenon is formed, and the use effect is affected.
In view of the above problems, embodiments of the present invention provide a backlight module, which can meet the requirement of a peep-proof function by shrinking the left and right viewing angles of the backlight module, and can meet the requirement of no LED Mura phenomenon under a white light image. Fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present invention, and referring to fig. 2, the backlight module according to the embodiment of the present invention includes
A back plate 10;
the first lamp panel 21 is arranged on one side of the backboard 10, and a plurality of first light sources 211 are arranged on the first lamp panel 21 at intervals;
the reflector sheet 30 is located on one side of the first lamp panel 21, which is far away from the backplane 10, the reflector sheet 30 includes a plurality of reflective structures 301, two adjacent and non-contact reflective structures 301 form a reflective unit 31 with a parabolic structure, a first light source 211 is arranged on the bottom of one reflective unit 31, and the first light source 211 is configured to emit light in a wide viewing angle mode;
the second lamp panel 22 is disposed on one side of the reflector sheet 30, which is far away from the backplane 10, a plurality of second light sources 221 are disposed on the second lamp panel 22 at intervals, and the second light sources 221 are configured to emit light in a narrow viewing angle mode; wherein the second light source 221 is disposed at a focal point of the reflection unit 31.
Specifically, the reflective structure 301 is concave, and the size of the reflective structure 301 in the extending direction along the first lamp panel 21 is defined as the thickness of the reflective structure 301, and the thickness of the reflective structure 301 gradually decreases in the direction away from the backplane 10. Two adjacent and non-contact reflecting structures 301 form a reflecting unit 31, the reflecting unit 31 has a parabolic structure, and a first light source 211 is disposed at the bottom of the reflecting unit 31 (at a gap between the two reflecting structures 301). Wherein, first light source 211 sets up on first lamp plate 21, and reflection unit 31 contacts with first lamp plate 21. That is to say, all be provided with reflective structure 301 around every first light source 211, reflective structure 301 can reflect the light that first light source 211 sent, has avoided the light that first light source 211 sent to be absorbed by rather than adjacent first light source 211 effectively, is favorable to improving the luminous efficacy of first lamp plate 21.
In the present embodiment, the first light source 211 is configured to emit light in a wide viewing angle mode. Optionally, referring to fig. 3, because the first light source 211 is disposed at the bottom of the reflection unit 31, and the height of the reflection structure 301 is reasonably set according to the light emitting angle of the first light source 211, the light emitted by the first light source 211 is not reflected by the reflection unit 31, and the included angle of the emitted light is the light emitting angle of the first light source 211 itself, so as to meet the light emitting requirement of the wide viewing angle sharing state.
With reference to fig. 2, a second lamp panel 22 is further disposed on a side of the reflector sheet 30 away from the backplane 10, and a plurality of second light sources 221 are distributed on the second lamp panel 22. In the present embodiment, the second light source 221 is disposed at a focal point of the reflection unit 31. Since the reflection unit 31 has a parabolic shape, all the light emitted from the focal point thereof is reflected by the reflection unit 31 and then emitted along the axial direction (y-axis direction) of the reflection unit 31. The second light source 221 is configured to emit light in a narrow viewing angle mode. Referring to fig. 4, since the second light source 221 is disposed at a focal position corresponding to the reflection unit 31, after the light emitted by the second light source 221 is reflected by the reflection unit 31 (the reflected light is shown by a dotted line in the figure), an included angle of the light emitted by the second light source 221 is smaller than an original light-emitting angle of the second light source 221, so that the emitted light of the second light source 221 has a higher collimation degree, and meets the light-emitting requirement of narrow-view peep prevention. And emergent rays are reflected out along the axis of the corresponding reflection unit 31, so that the uniformity of emergent brightness in a narrow visual angle mode is facilitated, and the phenomenon of LED Mura is prevented.
According to the technical scheme provided by the embodiment of the utility model, the double lamp panels and the parabolic reflector plate structure are adopted, the first light source on the first lamp panel is configured to emit light in a wide view angle mode, and the second light source on the second lamp panel is configured to emit light in a narrow view angle mode, so that the wide and narrow view angles can be freely switched, and the requirements of peeping prevention and sharing can be met. In this embodiment, the reflector plate is located first lamp plate and keeps away from backplate one side, the reflector plate includes a plurality of reflection configuration, adjacent and two noncontacting reflection configuration form parabolic structure's reflection unit, first light source is located reflection unit's bottom, the second light source is located reflection unit's focus, so that the light that the second light source sent all jets out along reflection unit's axis direction after passing through reflection unit reflection, play the effect of shrink backlight unit's visual angle, can improve the homogeneity of light-emitting luminance under the narrow visual angle mode simultaneously, prevent the phenomenon of LED Mura.
Optionally, fig. 5 is a schematic structural diagram of another backlight module according to an embodiment of the present invention, and referring to fig. 2 and fig. 5, on the basis of the above technical solution, a plurality of second light sources 221 are disposed on the second lamp panel 22 at equal intervals, and along a thickness direction of the backlight module, a vertical distance from the second light source 221 to the back panel 10 is greater than a vertical distance from a highest point of the reflector sheet 30 to the back panel 10. That is, the second light sources 221 are disposed at a position higher than the reflection unit 31, so as to ensure that the emergent light of the second light sources 221 can be just on the reflection unit 31, and the light mixing of the adjacent second light sources 221 is not caused.
Specifically, along the extending direction of second lamp panel 22, vertical distance D between two adjacent second light sources 221 satisfies:
p is a vertical distance between the second light source 221 and the first lamp panel 21 in the thickness direction of the backlight module, and θ is a light-emitting angle of the second light source 221. In this way, the light emitted from the adjacent second light sources 221 located at the focal point of the reflection unit 31 may be intersected at one half of the vertical distance between the adjacent second light sources 221. Fig. 6 is a graph of a parabola according to an embodiment of the present invention, and with reference to fig. 5 and fig. 6, a focal point of the parabola is an M point, a ordinate of the M point is P, the second light source 221 is disposed at the M point, and taking an outgoing light angle θ of the second light source 221 as 60 ° as an example, a light ray emitted by the second light source 221 is exactly located at an edge of the reflection unit 31 of the parabola structure, wherein an outgoing light ray of the second light source 221 intersects the reflection unit 31 at points N1 and N2, and outgoing light rays of two adjacent second light sources 221 intersect at a position D/2. The parabola satisfies equation x22Py, then point N1 satisfies x122Py1, in the triangle, x1 tan θ (P-y1) tan θ (P-x 1)2/2P), combining the two equations above and D ═ 2x1, one can obtain
When θ is 60 °, P is 0.526D. In this way, the focal position of the reflection unit 31, that is, the specific position where the second light source 221 is disposed, may be obtained.
Optionally, with continued reference to fig. 5, the perpendicular projection of the first light source 211 on the back plate 10 overlaps the perpendicular projection of the second light source 221 on the back plate 10.
Specifically, the first light sources 211 and the second light sources 221 may be the same type of light source, and have the same light-emitting angle, and the plurality of first light sources 211 are equidistantly distributed on the first lamp panel 21, and the plurality of second light sources 221 are equidistantly distributed on the second lamp panel 22, which is beneficial to the implementation of the process and the installation of the light sources. The first light source 211 and the second light source 221 are disposed opposite to each other and are located on an axis of the reflection unit 31, so as to ensure that emergent light of the first light source 211 and the second light source 221 is uniformly distributed.
In this embodiment, the size of the bottom of the reflection unit 31 is smaller than the size of the opening of the reflection unit 31, that is, the diameter of the opening of the reflection unit 31 is larger than the diameter of the bottom thereof, so as to ensure that the emergent light of the first light source 211 is not blocked and reflected by the reflection unit 31, improve the display effect in the wide viewing angle mode, and ensure the uniformity of the brightness. In a specific implementation, the curvature of the reflection unit 31 may be set according to the light emitting angles of the first light source 211 and the second light source 221.
Alternatively, fig. 7 is a light path diagram of a light source in another wide viewing angle mode according to an embodiment of the present invention, and referring to fig. 7, the second light source 221 may further emit light in the wide viewing angle mode. Because the first light source 211 and the second light source 221 emit light simultaneously, the backlight module is in the super-bright mode, so that the light emitting brightness in the wide-view-angle mode can be improved, and the visual effect can be enhanced.
In this embodiment, the reflective sheet 30 may be formed by common reflective vacuum molding, or may be formed by injection molding, and then a reflective material is coated on the surface of the reflective structure to form a reflective layer. In specific implementations, the reflective material may be silver, aluminum, white oil, white glue, resin, and the like.
Optionally, the second lamp panel 22 may use a sealant portion in the backlight module as a supporting layer. Fig. 8 is a schematic structural diagram of another backlight module according to an embodiment of the present invention, and referring to fig. 8, based on the above technical solutions, the sealant 100 is located on two sides of the second lamp panel 22 along the extending direction of the second lamp panel 22 to support the second lamp panel 22 (only one sealant is shown in the figure). The two ends of the second lamp panel 22 are respectively overlapped on the supporting steps formed by the sealant 100 to fix the second lamp panel 22, so that the second light source 221 on the second lamp panel 22 is located at the focal position of the reflection unit 31.
With reference to fig. 8, the backlight module further includes a diffusion sheet 40 disposed on a side of the second lamp panel 22 away from the back plate 10, wherein the diffusion sheet 40 is used to diffuse the emergent light of the first light source 211 and the second light source 221 through the diffusion coating, so that the light distribution is more uniform. In this embodiment, there is a preset distance between diffusion sheet 40 and second lamp plate 22, that is, diffusion sheet 40 and second lamp plate 22 do not directly contact with each other, so as to ensure that there is an enough light mixing distance between lamp plate and diffusion sheet 40, and light emitted by all light sources (including reflected light) is conveniently mixed. Of course, in other embodiments, if the light mixing distance of the backlight module is sufficient, the diffusion sheet 40 and the second lamp panel 22 may also be in direct contact.
A lower prism sheet 50 and an upper prism sheet 60 are further disposed on a side of the diffusion sheet 40 away from the back plate 10, and the function of gathering light rays is achieved by using the principle of refraction of light rays, wherein the angles of the lower prism sheet 50 and the upper prism sheet 60 are perpendicular to each other. Further, in order to protect the backlight module, a protection substrate 70 is further disposed on a side of the upper prism sheet 60 away from the back plate 10, wherein the protection substrate 70 is a transparent substrate.
The first light source 211 and the second light source 221 may be both self-light emitting devices such as LEDs, OLED devices, QLED devices, and Micro LED devices. For example, the LED device is used in this embodiment, and other self-light emitting devices such as an OLED device may also be used in other embodiments, which are not limited herein.
Specifically, after reflector plate 30 is formed, according to the curvature of reflector plate 30, height isoparametric, the LED device is beaten on glass or transparent substrate according to the set distance respectively, form first lamp plate 21 and second lamp plate 22, then install the first lamp plate 21 forward that has the LED in one side of backplate 10, and set up reflector plate 30 on first lamp plate 21, install second lamp plate 22 in backlight unit in reverse, make the light of second lamp plate 22 jet out towards the direction of reflector plate 30, wherein, the LED device on the second lamp plate 22 is located the focus of reflection unit 31. In the wide viewing angle mode, the LED devices on the first lamp panel 21 are lit, and light emitted from the LED devices passes through the second lamp panel 22 and directly irradiates the diffusion sheet 40, and passes through the diffusion sheet 40, the lower prism sheet 50, the upper prism sheet 60, and other optical films and then exits the backlight module. Light rays emitted by the LED devices on the first lamp panel 21 are not blocked and reflected by the reflection unit 31, and the light-emitting angle of the light rays is not changed, so that the requirement of a large viewing angle sharing state is met. In the narrow viewing angle mode, the LED devices on the second lamp panel 22 are lit, light emitted from the LED devices on the second lamp panel 22 directly irradiates the reflection unit 31, the light is reflected by the reflection unit 31, the emergent light is emitted along the axis direction of the reflection unit 31, and the reflected light passes through the diffusion sheet 40, the lower prism sheet 50, the upper prism sheet 60, and other optical films and then exits the backlight module. The light emitted by the LED devices on the second lamp panel 22 is reflected by the reflection unit 31, so that the angle of the light is changed, and the reflected light perpendicularly exits the backlight module, so that the light cannot be seen at a large viewing angle, and the requirement of narrow viewing angle peeping is met.
Of course, in the wide view angle mode, the LED devices on the first lamp panel 21 and the second lamp panel 22 can emit light simultaneously, so as to improve the light emitting brightness in the wide view angle mode.
Optionally, the embodiment of the utility model further provides a display device. Fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 9, the display device includes the backlight module according to any embodiment of the present invention, and further includes a display panel 200 disposed on a light-emitting side of the backlight module, light emitted from the backlight module directly enters the display panel 200, and the display panel 200 may be a liquid crystal display panel. In this embodiment, the display device may be a mobile phone, and may also be any electronic product with a display function, including but not limited to the following categories: the touch screen display system comprises a television, a notebook computer, a desktop display, a tablet computer, a digital camera, an intelligent bracelet, intelligent glasses, a vehicle-mounted display, medical equipment, industrial control equipment, a touch interaction terminal and the like, and the embodiment of the utility model is not particularly limited in this respect.
Further, the display device further includes a plurality of driving modules to drive components such as the display panel 200, the first lamp panel 21, and the second lamp panel 22. Fig. 10 is a schematic structural diagram of a driving system in a display device according to an embodiment of the present invention, and referring to fig. 10, a driving module a is used for driving a liquid crystal display panel (LCD)200 and providing driving signals and voltages for thin film transistors in the display panel 200; the driving module B is configured to provide a driving current to the LED device on the first lamp panel 21; the driving module C is used for providing driving current for the LED devices on the second lamp panel 22. The driving module a is directly connected to the control signal interface 11, and the driving module B and the driving module C are connected to the control signal interface 11 through the switching control module 12, wherein the control signal interface 11 can be connected to a controller (not shown in the figure) for providing the display data signal and the input of the control signal and the voltage signal, and for providing the display mode switching control signal.
In this embodiment, the driving module a may include a power management chip 131, a timing controller 132 and a driving chip (Source IC)133, where the power management chip 131 is configured to provide voltage signals to the timing controller 132 and the driving chip 133, and the timing controller 132 is configured to provide timing control signals to the driving chip to control the driving chip 133 to generate driving signals of the display panel 200.
Alternatively, the display mode switching control may be controlled by two signals, for example, the two signals include a first control signal and a second control signal, where the first control signal is used to control the driving module B, and the second control signal is used to control the driving module C.
Specifically, in the narrow viewing angle mode, the driving module a is controlled to operate, so that the display panel 200 is in the display state, and the switching control module 12 controls the level states of the first path of control signal and the second path of control signal according to the received display mode switching control signal, where the first path of control signal is at a low level, the second path of control signal is at a high level, the driving module C is controlled to be in the operating state, and the driving module B is controlled to be turned off, the LED on the first lamp panel 21 does not emit light, and the LED on the second lamp panel 22 emits light.
In the wide viewing angle mode, the driving module a is controlled to operate, so that the display panel 200 is in the display state, the switching control module 12 controls the level states of the first path of control signal and the second path of control signal according to the received display mode switching control signal, where the first path of control signal is at a high level, the second path of control signal is at a low level, the driving module B is controlled to be in the operating state, and the driving module C is controlled to be turned off, the LED on the first lamp panel 21 emits light, and the LED on the second lamp panel 22 does not emit light.
In the super-bright mode, the driving module a is controlled to operate, so that the display panel 200 is in a display state, the switching control module 12 controls the level states of the first path of control signal and the second path of control signal according to the received display mode switching control signal, wherein the first path of control signal is at a high level, the second path of control signal is at a high level, the driving module B is controlled to be in a working state, the driving module C is controlled to be in a working state, the LED on the first lamp panel 21 emits light, and the LED on the second lamp panel 22 emits light.
When the first path of control signal is at low level and the second path of control signal is also at low level, the display device is in a closed state.
Optionally, fig. 11 is a schematic structural diagram of a driving system in another display device according to an embodiment of the present invention, specifically, a schematic physical structural diagram of the driving system shown in fig. 10, and with reference to fig. 11, on the basis of the foregoing technical solution, a driving module a, a driving module B, a driving module C, and a switching control module 12 are all disposed on a driving board (PCBA), the display panel 200, the first lamp panel 21, and the second lamp panel 22 are respectively connected with the corresponding driving modules through flexible circuit boards FPC, and the driving board may be disposed on a non-light-emitting side of the backlight module, which is beneficial to realizing a narrow frame of the display device.
Since the display device provided by the embodiment of the present invention includes the backlight module provided by any embodiment of the present invention, the display device also has the beneficial effects described in any embodiment of the present invention, and details are not repeated.
It is to be noted that the foregoing description is only exemplary of the utility model and that the principles of the technology may be employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in more detail by the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the spirit of the present invention.
Claims (10)
1. A backlight module, comprising:
a back plate;
the first lamp panel is arranged on one side of the backboard, and a plurality of first light sources are arranged on the first lamp panel at intervals;
the reflector plate is positioned on one side, far away from the backboard, of the first lamp panel and comprises a plurality of reflection structures, two adjacent and non-contact reflection structures form a reflection unit with a parabolic structure, a first light source is arranged on the bottom of the reflection unit, and the first light source is configured to emit light in a wide view angle mode;
the second lamp panel is arranged on one side, away from the backboard, of the reflector plate, a plurality of second light sources are arranged on the second lamp panel at intervals, and the second light sources are configured to emit light in a narrow viewing angle mode; wherein the second light source is disposed on a focal point of the reflection unit.
2. The backlight module according to claim 1, wherein the second light sources are disposed on the second lamp panel at equal intervals, and a vertical distance from the second light sources to the back panel is greater than a vertical distance from a highest point of the reflector plate to the back panel along a thickness direction of the backlight module.
3. The backlight module according to claim 2, wherein along the extending direction of the second lamp panel, the vertical distance D between two adjacent second light sources satisfies:
and P is the vertical distance between the second light source and the first lamp panel in the thickness direction of the backlight module, and theta is the light-emitting angle of the second light source.
4. A backlight module according to claim 1, wherein the bottom dimension of the reflecting unit is smaller than the opening dimension of the reflecting unit.
5. The backlight module according to claim 1, wherein a vertical projection of the first light source on the back plate overlaps with a vertical projection of the second light source on the back plate.
6. The backlight module according to claim 1, further comprising sealant, wherein the sealant is located at two sides of the second lamp panel along an extending direction of the second lamp panel, and is configured to support the second lamp panel.
7. A backlight module according to claim 1, wherein the second light source is further configured to emit light in a wide viewing angle mode.
8. The backlight module as claimed in claim 1, further comprising a diffusion sheet disposed on a side of the second lamp panel away from the back plate.
9. A display device, comprising the backlight module as claimed in any one of claims 1 to 8, and a display panel disposed at a light-emitting side of the backlight module.
10. The display device according to claim 9, further comprising a plurality of driving modules disposed on a driving board, wherein the first and second lamp panels are respectively connected to the corresponding driving modules through flexible circuit boards.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115728992A (en) * | 2022-11-24 | 2023-03-03 | 深圳创维－Rgb电子有限公司 | Backlight module and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115728992A (en) * | 2022-11-24 | 2023-03-03 | 深圳创维－Rgb电子有限公司 | Backlight module and display device |
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