CN110308588B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN110308588B CN110308588B CN201910579015.0A CN201910579015A CN110308588B CN 110308588 B CN110308588 B CN 110308588B CN 201910579015 A CN201910579015 A CN 201910579015A CN 110308588 B CN110308588 B CN 110308588B
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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
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Abstract
The embodiment of the invention discloses a backlight module and a display device. The backlight module comprises a bottom plate and a plurality of side walls intersected with the bottom plate; the bottom plate is provided with a first light source; the side opposite to the bottom plate comprises a first light-emitting surface of the backlight module, and at least one side wall comprises a second light-emitting surface of the backlight module. According to the backlight module provided by the embodiment of the invention, the light emergent surfaces are arranged on one side opposite to the bottom plate and at least one side wall, and the first light source on the bottom plate provides backlight required by the display panels, so that the backlight module can provide backlight for at least two display panels simultaneously, and the design cost of the display device is reduced.
Description
Technical Field
The embodiment of the invention relates to a display technology, in particular to a backlight module and a display device.
Background
With the development of display technology, the application of display screens is more and more extensive, and many products comprise more than one display screen. For example, in the field of in-vehicle displays, in-vehicle Display screens include Head Up Displays (HUDs), center control displays, instrument displays, and the like. Since the reliability of the Organic Light Emitting Diode (OLED) cannot be matched with the requirements of the vehicle specifications for a while, the Liquid Crystal Display (LCD) is mainly used at present.
Because the position of the display screen in the vehicle-mounted structure is more, compared with a consumer product display screen which is designed more strictly, the probability of space intersection is high, and in an actual product, the utilization of the structural space is compact, hardware cannot be effectively shared, so that the product cost is higher, and the energy consumption is higher. For example, most of the designs of the instrument panels at present do not realize the application of the full liquid crystal display, and the instrument panels usually have a single display mode, but the structural design becomes complicated due to the odd shape, which is a great challenge for the design of the backlight.
Disclosure of Invention
The embodiment of the invention provides a backlight module and a display device, wherein the backlight module can provide backlight for at least two display screens, so that the design cost of the display device is reduced.
In a first aspect, an embodiment of the present invention provides a backlight module, including a bottom plate and a plurality of sidewalls intersecting the bottom plate;
a first light source is arranged on the bottom plate; one side opposite to the bottom plate comprises a first light-emitting surface of the backlight module, and at least one side wall comprises a second light-emitting surface of the backlight module.
In a second aspect, an embodiment of the present invention further provides a display device, including any one of the backlight modules described above.
The backlight module provided by the embodiment of the invention comprises a bottom plate and a plurality of side walls intersected with the bottom plate; the bottom plate is provided with a first light source; the side opposite to the bottom plate comprises a first light-emitting surface of the backlight module, and at least one side wall comprises a second light-emitting surface of the backlight module. The light emergent surfaces are arranged on the opposite side and the at least one side wall of the bottom plate, and the first light source on the bottom plate provides backlight needed by the display panels, so that the backlight module can provide backlight for the at least two display panels simultaneously, and the design cost of the display device is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line AA' of FIG. 1;
FIG. 3 is a schematic view of another cross-sectional structure taken along the line AA' in FIG. 1;
FIG. 4 is a schematic view of another cross-sectional structure taken along line AA' of FIG. 1;
FIG. 5 is a schematic view of another cross-sectional structure taken along line AA' of FIG. 1;
FIG. 6 is a schematic view of another cross-sectional structure taken along line AA' of FIG. 1;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another display device according to an embodiment of the invention;
fig. 10 is a schematic structural diagram of another display device according to an embodiment of the invention;
fig. 11 is a schematic structural diagram of a light guide structure according to an embodiment of the present invention;
fig. 12 is a schematic cross-sectional view taken along the line BB' in fig. 11.
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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the invention provides a backlight module, which comprises a bottom plate and a plurality of side walls intersected with the bottom plate; the bottom plate is provided with a first light source; the side opposite to the bottom plate comprises a first light-emitting surface of the backlight module, and at least one side wall comprises a second light-emitting surface of the backlight module.
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the invention, and fig. 2 is a schematic structural diagram of a cross-section along a cross-sectional line AA' in fig. 1. Referring to fig. 1 and fig. 2, the backlight module provided in this embodiment includes a bottom plate 10 and four sidewalls intersecting the bottom plate 10, which are a sidewall 20, a sidewall 21, a sidewall 22, and a sidewall 23; side wall 20 corresponds to the front side in fig. 1, side wall 21 corresponds to the left side in fig. 1, side wall 22 corresponds to the rear side in fig. 1, and side wall 23 corresponds to the right side in fig. 1. The base plate 10 is provided with a first light source 11; the side opposite to the bottom plate 10 includes a first light emitting surface 30 of the backlight module, and the side wall 23 includes a second light emitting surface 40 of the backlight module.
It should be noted that the shape of the backlight module shown in fig. 1, the backlight module including four sidewalls and the second light emitting surface disposed on one sidewall are only schematic, and in specific implementation, the number of the sidewalls and the number of the second light emitting surfaces may be set according to an actual application scenario, the backlight module may include more sidewalls, or the second light emitting surfaces may be disposed on a plurality of sidewalls, which is not limited in the embodiment of the present invention. In the following embodiments, the backlight module includes four sidewalls, and one of the sidewalls includes the second light emitting surface, which is taken as an example, and the technical solution of the embodiments of the present invention is described in detail.
It can be understood that the backlight module provided in this embodiment includes a bottom plate 10 and a cavity formed by four sidewalls (a sidewall 20, a sidewall 21, a sidewall 22, and a sidewall 23), the first Light source 11 may include a plurality of Light Emitting Diodes (LEDs) 111, the first Light Emitting surface 30 may be a hollow structure disposed on a top plate (a side opposite to the bottom plate 10) of the backlight module, and the second Light Emitting surface 40 may be a hollow structure disposed on the sidewall 23. Fig. 2 further schematically illustrates a light path schematic diagram of the backlight module provided in this embodiment, a part of light emitted by the first light source 11 reaches the first light-emitting surface 30 after passing through the cavity, and can provide backlight for the display panel disposed at the position of the first light-emitting surface 30; due to the large divergence angle of the LED, there is a portion of the large-angle light emitted to the sidewall 23, and the portion of the light can exit through the second light-exiting surface 40 to provide backlight for the display panel disposed at the position of the second light-exiting surface 40.
According to the technical scheme of the embodiment of the invention, the light emergent surfaces are arranged on one side and at least one side wall which are opposite to the bottom plate, and the first light source on the bottom plate provides backlight needed by the display panels, so that the backlight module can provide backlight for at least two display panels simultaneously, and the design cost of the display device is reduced.
On the basis of the above technical solution, fig. 3 is a schematic view of another cross-sectional structure along the cross-sectional line AA' in fig. 1. Referring to fig. 3, optionally, the backlight module provided in this embodiment further includes a second light source 12 disposed on the sidewall 21 opposite to the second light emitting surface 40.
It can be understood that the same kind of LEDs may be used for the second light source 12 and the first light source 11, and by disposing the second light source 12 on the side wall 21 opposite to the second light emitting surface 40, the light emitted by the second light source 12 exits through the second light emitting surface 40, so as to provide backlight for the display panel disposed at the position of the second light emitting surface 40, and the light emitting brightness of the second light emitting surface 40 can be improved. In other embodiments, when the backlight module includes more sidewalls, there may be more sidewalls opposite to the second light-emitting surface 40, and the second light sources may be disposed on the sidewalls opposite to the second light-emitting surface 40, so as to improve the uniformity of light emitted from the second light-emitting surface 40.
Fig. 4 is a schematic view of another cross-sectional structure taken along the cross-sectional line AA' in fig. 1. Referring to fig. 4, optionally, the backlight module provided in this embodiment further includes a reflective structure 13 disposed on the sidewall 21 opposite to the second light-emitting surface 40, and the reflective structure 13 is used for reflecting a portion of the light emitted by the first light source 11 to the second light-emitting surface 40.
By providing the reflective structure 13, a part of the light of the first light source 11 can be reflected to the second light emitting surface 40, so as to improve the light emitting brightness of the second light emitting surface 40. The reflecting structure 13 may further include a micro-lens structure, scattering particles, and the like, so as to enhance the uniformity of light reflection of the reflecting structure 13. Optionally, if the brightness of the light of the second light emitting surface 40 is insufficient, a reflective structure may be further disposed on the side wall 20 and the side wall 22 to improve the light emitting brightness of the second light emitting surface 40. In other embodiments, when the backlight module includes more sidewalls, there may be more sidewalls opposite to the second light emitting surface 40, and a reflective structure may be disposed on all the sidewalls opposite to the second light emitting surface 40 to improve uniformity of light emitted from the second light emitting surface 40.
Optionally, with continuing reference to fig. 3, the bottom plate 11 and/or the sidewall 21 may also be provided with the reflective structure 13, and the reflective structure 12 is provided on the bottom plate 11 and/or the sidewall 21, so as to improve the brightness of the first light emitting surface 30 and the second light emitting surface 40, and improve the performance of the backlight module.
Fig. 5 is a schematic view of another cross-sectional structure taken along the cross-sectional line AA' in fig. 1. Referring to fig. 5, optionally, the backlight module provided in this embodiment further includes a light adjusting structure 50; the light ray adjusting structure 50 is located on an exit light path of the second light emitting surface 40; the light adjusting structure 50 includes a convex lens, a fresnel lens or a lens assembly including at least one convex lens and one concave lens.
It can be understood that, since the light is transmitted a distance in the cavity of the backlight module, the collimation performance of the light is reduced, the light emitted from the second light emitting surface 40 may be relatively divergent, and the light adjusting structure 50 with a certain converging function may be arranged to converge the light and then irradiate the display panel arranged at the second light emitting surface 40. The light ray adjusting structure 50 may be a convex lens, a fresnel lens, or a lens group with a converging function, and the specific structure of the light ray adjusting structure 50 is not limited in the embodiment of the present invention. In this embodiment, the exit light path of the second light emitting surface 40 refers to a position where light exits between the second light emitting surface 40 and the display panel located at the second light emitting surface 40, and in other embodiments, a light adjusting structure may be disposed on the exit light path of the first light emitting surface 30 to improve the collimation of the light exiting from the first light emitting surface 30 and improve the light exiting quality of the backlight module.
Fig. 6 is a schematic view of another cross-sectional structure taken along the cross-sectional line AA' in fig. 1. Referring to fig. 6, optionally, the backlight module provided in this embodiment further includes a first light guide plate 60, and the first light guide plate 60 is located between the first light source 11 and the first light emitting surface 30. Through the arrangement of the first light guide plate 60, light can be respectively guided out through the first light emitting surface 30 and the second light emitting surface 40, the side wall of the first light guide plate 60 can be a reflecting surface, a scattering structure and the like can be arranged inside the first light guide plate, and the performance of the backlight module is improved.
The embodiment of the invention also provides a display device which comprises any one of the backlight modules provided by the embodiment. The display device provided by the invention comprises at least two display panels facing different directions, and can be an industrial control device comprising various display screens, a vehicle-mounted display device comprising various display functions and the like.
For example, taking a display device including two display panels as an example, fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention. Optionally, the display device provided in this embodiment includes the backlight module 100, and further includes a first display panel 200 and a second display panel 300, where the first display panel 200 is located on an emergent light path of the first light emitting surface 30, and the second display panel 300 is located on an emergent light path of the second light emitting surface 40; the backlight module 100 provides backlight for the first display panel 200 through the first light emitting surface 30; the backlight module 100 backlights the second display panel 300 through the second light emitting surface 40.
It is understood that the backlight module 100 may be any one of the backlight modules provided in the above embodiments, and the first display panel 200 and the second display panel 300 may be liquid crystal display panels, which generally include a Color Filter (CF) substrate and a Thin Film Transistor (TFT) array substrate, and a liquid crystal layer between the CF substrate and the TFT substrate. The liquid crystal display has the working principle that liquid crystal molecules in a liquid crystal layer are controlled to rotate by applying driving voltage, and a light source provided by a backlight module penetrates through a TFT array substrate of a liquid crystal display panel, is refracted out of the liquid crystal layer of the liquid crystal display panel and generates a color picture through a CF substrate.
Optionally, with continued reference to fig. 7, the display device provided in this embodiment is an in-vehicle display device, the first display panel 200 is a head-up display panel, and the second display panel 300 is a head-down display panel.
It can be understood that the Head Up Display (HUD), also called a parallel Display system, is used to project important driving information such as speed per hour and navigation onto a windshield in front of a driver, so that the driver can see the important driving information such as speed per hour and navigation without lowering Head or turning Head as much as possible, thereby improving driving safety. The head-lowering display panel can be an instrument panel, a central control display panel and other display panels. HUD's luminance in a poor light can reach 100000 ~ 200000nit generally, through the backlight unit that this embodiment provided, can be with HUD's partial leading-in instrument panel etc. low head display panel in a poor light, reduce equipment complexity, practice thrift cost and energy consumption. In addition, since the HUD generally needs to project a display screen onto an inclined windshield, the first display panel 200 is generally disposed at a certain inclination angle with respect to a horizontal plane, as shown in fig. 7.
Fig. 8 is a schematic structural diagram of another display device according to an embodiment of the present invention. Referring to fig. 8, optionally, the display device provided in this embodiment further includes a light path conversion structure 400 located on the light emitting path of the second light emitting surface 40, where the light path conversion structure 400 is used for converting the light emitted from the second light emitting surface 40 to be incident on the second display panel 300.
It is understood that in some embodiments, the second display panel 300 is not directly located on the emergent surface of the second emergent side 40, for example, in an in-vehicle display device, the second display panel 300 (e.g., an instrument panel) is generally located below the first display panel 200 (head-up display panel), and the light of the second emergent surface 40 is guided to the second display panel 300 by the light path conversion structure 400.
Optionally, with continued reference to fig. 8, the optical path conversion structure 400 includes a mirror 401.
In a specific implementation, the light path conversion structure 400 may be directly configured as a mirror-surface type reflector, and reflects the emergent light of the second light-emitting surface 40 to the incident light side of the second display panel 300 as an edge-type backlight. In other embodiments, the total reflection structure 400 may be a total reflection prism according to the fresnel law, and reflects the outgoing light from the second light emitting surface 40 to the incoming light of the second display panel 300 for measurement.
Fig. 9 is a schematic structural diagram of another display device according to an embodiment of the present invention. Referring to fig. 9, optionally, the optical path conversion structure 400 includes a concave lens 402 and a light guide prism 403, the light guide prism 403 including a prism structure; the light guide prism 403 serves to guide the light transmitted by the concave lens 402 to the second display panel 300. It can be understood that a reflective sheet or a reflective plate may be further disposed on a side of the light guide prism 403 facing away from the concave lens 402, so as to further increase the light utilization rate.
In some embodiments, the light exiting from the second light-emitting surface 40 may be a converged light, and the converged light may be re-distributed after passing through the concave lens 402 and then guided into the second display panel 300 through the prism-type light guide prism 403.
Optionally, a first included angle is formed between the plane of the bottom plate and the plane of the second display panel, and the first included angle is greater than 0 ° and smaller than 180 °.
For example, referring to fig. 8, the first included angle θ in this embodiment refers to an included angle between a direction x parallel to a plane of the bottom plate 10 and a direction y parallel to a plane of the second display panel 300, and in other embodiments, the extending direction of the second display panel 300 may also be parallel to y1 or y2 in fig. 8 (the included angle θ is respectively included in the direction x1And theta2) In specific implementation, the extending direction of the second display panel 300 may be selected according to an actual scene, for example, the plane where the bottom plate 10 is located in the embodiment shown in fig. 8 and 9 is perpendicular to the plane where the second display panel 300 is located, that is, the first included angle is 90 °, and in other embodiments, the first included angle may be greater than 0 ° and less than 180 °. Further, the first included angle is greater than or equal to 45 ° and less than or equal to 135 ° to ensure the clarity of viewing the second display panel 300.
Fig. 10 is a schematic structural diagram of another display device according to an embodiment of the present invention. Referring to fig. 10, optionally, the display device provided in this embodiment further includes a light guide structure 500; the light guide structure 500 is located at the light incident side of the second display panel 300.
By providing the light guide structure 500, the backlight of the second display panel 300 can be more uniform, and the display effect of the second display panel 300 can be improved.
Fig. 11 is a schematic structural diagram of a light guide structure according to an embodiment of the present invention. Referring to fig. 11, optionally, the second display panel includes at least two display regions, and the light guide structure 500 includes reflective or refractive structures 501 corresponding to the display regions one to one and having the same shape, for providing backlight to the display regions. Fig. 12 is a schematic cross-sectional view taken along the cross-sectional line BB' of fig. 11, and a reflection or refraction structure similar to a prism is disposed in the area corresponding to the second display panel, so as to facilitate the uniform light path emergence.
Illustratively, the second display panel may be an instrument panel, which generally has only a partial area for display, for example, including two circular instrument areas, and the light guide structure 500 is provided with a reflective or refractive structure corresponding to the display area to provide uniform backlight for the display area. In addition, structures 502 which are helpful for scattering, such as micro prisms, can be further designed on the side of the light guide structure 500 close to the light path conversion structure, so that the light path can be uniformly emitted.
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 modifications, rearrangements, combinations 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 (15)
1. A backlight module is characterized by comprising a bottom plate and a plurality of side walls intersected with the bottom plate;
a first light source is arranged on the bottom plate; one side opposite to the bottom plate comprises a first light-emitting surface of the backlight module, and at least one side wall comprises a second light-emitting surface of the backlight module;
the second light emitting surface is a hollow structure arranged on the side wall.
2. The backlight module as claimed in claim 1, further comprising a second light source disposed on the sidewall opposite to the second light-emitting surface.
3. The backlight module as claimed in claim 1, further comprising a reflective structure disposed on the sidewall opposite to the second light-emitting surface, wherein the reflective structure is configured to reflect a portion of the light emitted from the first light source to the second light-emitting surface.
4. The backlight module of claim 1, further comprising: a light ray adjusting structure; the light ray adjusting structure is positioned on an emergent light path of the second light emitting surface; the light ray adjusting structure comprises a convex lens, a Fresnel lens or a lens group, wherein the lens group comprises at least one convex lens and one concave lens.
5. The backlight module as claimed in claim 1, further comprising a first light guide plate disposed between the first light source and the first light emitting surface.
6. A display device comprising the backlight module of any one of claims 1 to 5.
7. The display device according to claim 6, further comprising a first display panel and a second display panel, wherein the first display panel is located on an exit light path of the first light exit surface, and the second display panel is located on an exit light path of the second light exit surface; the backlight module provides backlight for the first display panel through the first light-emitting surface; the backlight module is used for backlighting the second display panel through the second light-emitting surface.
8. The display device according to claim 7, wherein the display device is an in-vehicle display device, the first display panel is a head-up display panel, and the second display panel is a heads-down display panel.
9. The display device according to claim 7, further comprising a light path conversion structure located on an exit light path of the second light exit surface, wherein the light path conversion structure is configured to convert light exiting from the second light exit surface to enter the second display panel.
10. The display device according to claim 9, wherein a plane of the bottom plate and a plane of the second display panel have a first included angle, and the first included angle is greater than 0 ° and smaller than 180 °.
11. The display device according to claim 10, wherein the first included angle is greater than or equal to 45 °, and less than or equal to 135 °.
12. The display device according to claim 9, wherein the light path conversion structure comprises a mirror.
13. The display device according to claim 9, wherein the light path conversion structure comprises a concave lens and a light guide prism;
the light guide prism is used for guiding the light transmitted by the concave lens into the second display panel.
14. The display device according to claim 8, further comprising a light guide structure;
the light guide structure is located on the light incident side of the second display panel.
15. The display device according to claim 14, wherein the second display panel comprises at least two display regions, and the light guide structure comprises reflective or refractive structures corresponding to the display regions one to one and having the same shape for providing backlight to the display regions.
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| CN201910579015.0A CN110308588B (en) | 2019-06-28 | 2019-06-28 | Backlight module and display device |
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| JP6533540B2 (en) * | 2017-01-27 | 2019-06-19 | 矢崎総業株式会社 | Backlight unit and head-up display device |
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