CN112578589A - Display device and backlight module - Google Patents
Display device and backlight module Download PDFInfo
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- CN112578589A CN112578589A CN201910923276.XA CN201910923276A CN112578589A CN 112578589 A CN112578589 A CN 112578589A CN 201910923276 A CN201910923276 A CN 201910923276A CN 112578589 A CN112578589 A CN 112578589A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a display device and a backlight module, the display device comprises the backlight module and a display panel positioned at the light-emitting side of the backlight module, the backlight module comprises: the LED backlight module comprises a back plate, a reflecting plate, a diffusion plate, a partial reflection part transmission layer, a support and a light bar, wherein the reflecting plate is positioned on the surface of the back plate, the diffusion plate is positioned on one side of the reflecting plate, which is away from the back plate, the partial reflection part transmission layer is positioned on the surface, which faces the reflecting plate, of the diffusion plate, the support is fixed on the reflecting; the reflecting plate and the diffusion plate form a hollow cavity; the support is used for supporting the light bar, so that the light bar has a set distance with the reflecting plate and the partial reflecting part transmission layer; the reflecting plate and the partial reflecting part transmitting layer are used for enabling partial emergent light rays of the light bar to be emitted outwards from one side of the diffusing plate after being reflected for a limited time in the cavity. This structure makes light multiple reflection in the cavity, and the light that the lamp strip sent can fully mix the light, and the even partial reflection part of following of reverberation shines the layer and incides the diffuser plate, finally provides even backlight for display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device and a backlight module.
Background
The lcd device is a major display device in the market, and includes a backlight module and an lcd panel, which cannot emit light and needs to provide uniform surface illumination.
In the direct type backlight module of tradition, including the lamp strip, and the lamp strip can set up on backlight module's backplate, and the light of lamp strip outgoing is after the mixed light of certain mixed light distance, incides the diffuser plate, forms more even light-emitting on the surface of diffuser plate. However, along with the pursuit of people on the appearance beauty and novelty of the display device, the back plate of the backlight module is more prone to be manufactured into a non-planar shape, so that the lamp strip in the backlight module cannot be arranged on the back plate with a special shape, and even if the lamp strip can be arranged on the back plate, the problem of nonuniform subjective light emission caused by insufficient light emergent conditions and light mixing can be solved.
Disclosure of Invention
In order to solve the above problems, the present invention provides a display device and a backlight module.
In a first aspect, an embodiment of the present invention provides a display device, including a backlight module and a display panel located on a light exit side of the backlight module, where the backlight module includes: the LED backlight module comprises a back plate, a reflecting plate, a diffusion plate, a partially reflecting and partially transmitting layer, a support and a light bar, wherein the reflecting plate is positioned on the surface of the back plate, the diffusion plate is positioned on one side of the reflecting plate, which is away from the back plate, the partially reflecting and partially transmitting layer is positioned on the surface, which faces the reflecting plate, of the diffusion plate, the support is fixed on the reflecting plate, and the light; the reflecting plate and the diffusion plate form a hollow cavity;
the support is used for supporting the light bar, so that a set distance exists between the light bar and the reflecting plate and between the light bar and the partially reflecting and partially transmitting layer;
the reflecting plate and the partial reflecting partial transmitting layer are used for enabling partial emergent light rays of the light bar to be emitted outwards from one side of the diffusion plate after being reflected for a limited time in the cavity.
In a possible implementation manner, in a display device provided in an embodiment of the present invention, the light bar includes: the LED lamp comprises a circuit board and a plurality of LEDs connected to one side of the circuit board;
the extending direction of the light bar is parallel to the plane of the diffusion plate, the included angle between the plane of the circuit board and the plane of the diffusion plate is an acute angle, and the light emitting diode is positioned on one side of the circuit board facing the reflection plate.
In one possible implementation manner, in a display device provided in an embodiment of the present invention, the reflection plate includes: a central region and an edge region surrounding the central region; the edge area is folded towards one side of the diffusion plate to be in contact with the edge of the diffusion plate;
the bracket is disposed in a central region of the reflection plate.
In a possible implementation manner, in a display device provided in an embodiment of the present invention, the backlight module includes: a plurality of the light bars;
the two lamp strips form a lamp strip group, and the lamp strip group is arranged on the same group of brackets;
the extending directions of the two light bars in the light bar group are the same, one side edges of the two light bars are in contact with each other, and the two light bars are symmetrically arranged around a first plane; the first plane comprises the sides of the light bars which are contacted with each other, and the first plane is perpendicular to the plane of the diffusion plate.
In a possible implementation manner, in the display device provided in the embodiment of the present invention, the display device includes a plurality of the light bar groups, and the extending directions of the light bar groups are the same;
the reflecting plate comprises a convex edge protruding towards one side of the diffusion plate between two adjacent lamp strip groups, and the extending direction of the edge of the convex edge is parallel to the extending direction of the lamp strip groups;
the convex edges at least comprise two inclined planes which are inclined relative to the plane where the diffusion plate is located, the inclined planes are arranged corresponding to the adjacent light bar groups, and the inclined planes are used for reflecting light rays incident from the corresponding light bar groups to one side of the diffusion plate.
In a possible implementation manner, in a display device provided in an embodiment of the present invention, the display device further includes: the light shading structure is arranged on one side surface, deviating from the partial reflection part transmission layer, of the diffusion plate, the light shading structure is arranged in a set area of the diffusion plate, and the emergent light intensity of the set area is larger than a preset threshold value.
In a possible implementation manner, in the display device provided in the embodiment of the present invention, the light bar further includes: and the radiator is positioned on one side of the circuit board, which is far away from the light-emitting diode, and is bonded with the circuit board through heat-conducting glue.
Preferably, the support is a transparent support.
In a possible implementation manner, in the display device provided by the embodiment of the invention, the reflective plate includes a substrate and white ink applied to a surface of the substrate on a side away from the back plate.
In a second aspect, an embodiment of the present invention provides a backlight module, including:
the LED backlight module comprises a back plate, a reflecting plate, a diffusion plate, a partially reflecting and partially transmitting layer, a support and a light bar, wherein the reflecting plate is positioned on the surface of the back plate, the diffusion plate is positioned on one side of the reflecting plate, which is away from the back plate, the partially reflecting and partially transmitting layer is positioned on the surface, which faces the reflecting plate, of the diffusion plate, the support is fixed on the reflecting plate, and the light; the reflecting plate and the diffusion plate form a hollow cavity;
the support is used for supporting the light bar, so that a set distance exists between the light bar and the reflecting plate and between the light bar and the partially reflecting and partially transmitting layer;
the reflecting plate and the partial reflecting partial transmitting layer are used for enabling partial emergent light rays of the light bar to be emitted outwards from one side of the diffusion plate after being reflected for a limited time in the cavity.
The invention has the following beneficial effects:
the backlight module provided by the invention comprises: the LED backlight module comprises a back plate, a reflecting plate, a diffusion plate, a partial reflection part transmission layer, a support and a light bar, wherein the reflecting plate is positioned on the surface of the back plate, the diffusion plate is positioned on one side of the reflecting plate, which is away from the back plate, the partial reflection part transmission layer is positioned on the surface, facing the reflecting plate, of the diffusion plate, the support is fixed on the reflecting plate; the reflecting plate and the diffusion plate form a hollow cavity; the support is used for supporting the light bar, so that the light bar has a set distance with the reflecting plate and the partial reflecting part transmission layer; the reflecting plate and the partial reflecting part transmitting layer are used for enabling partial emergent light rays of the light bar to be emitted outwards from one side of the diffusing plate after being reflected for a limited time in the cavity. The light rays emitted by the lamp strip can be emitted after being circularly reflected in the cavity, the cavity provides enough light mixing distance for the lamp strip, and finally the light rays are uniformly emitted by the emergent light of the diffusion plate, so that uniform backlight is provided for the display device. Because the lamp strip is maked somebody a mere figurehead in the cavity by the support, the backplate molding is not restricted by the lamp strip, can design for non-planar structure, satisfies display device's pleasing to the eye demand.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a display device according to an embodiment of the invention;
fig. 2a is a schematic structural diagram of a light bar according to an embodiment of the present invention;
fig. 2b is a schematic cross-sectional view illustrating a second display device according to an embodiment of the invention;
fig. 3 is a third schematic cross-sectional view illustrating a display device according to an embodiment of the invention;
FIG. 4 is a fourth schematic cross-sectional view of a display device according to an embodiment of the present invention;
FIG. 5 is a fifth schematic cross-sectional view of a display device according to an embodiment of the present invention;
fig. 6a is a second schematic structural view of the light bar according to the embodiment of the invention;
fig. 6b is a third schematic structural view of the light bar according to the embodiment of the invention;
fig. 7 is a schematic cross-sectional structure view of a backlight module according to an embodiment of the 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 apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the 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.
In a first aspect, the present invention provides a display device. Fig. 1 is a schematic cross-sectional view of a display device according to an embodiment of the invention. As shown in fig. 1, the display device includes a backlight module 100 and a display panel 200 disposed at a light emitting side of the backlight module 100. The backlight module 100 includes: a back plate 101, a reflective plate 102 disposed on a surface of the back plate 101, a diffuser plate 104 disposed on a side of the reflective plate 102 facing away from the back plate 101, a partially reflective transmissive layer 103 disposed on a surface of the diffuser plate 104 facing the reflective plate 102, a bracket 105 fixed on the reflective plate 102, and a light bar 106 mounted on the bracket 105; the reflective plate 102 and the diffusion plate 104 form a hollow cavity.
As shown in fig. 1, the structure of the back plate 101 is not limited to a planar back plate, and can be designed into various non-planar structures to meet the aesthetic requirement of the display device. The bracket 105 is used for supporting the light bar 106, so that the light bar 106 has a set distance with the reflective plate 102 and the partially reflective and partially transmissive layer 103. Specifically, two ends of the extending direction of the light bar 106 can be fixed by two brackets 105, and the fixing manner can be mechanical fixing or adhesive bonding. In this way, the light bar 106 is equivalent to being overhead in the cavity, and the distance between the light bar and the reflective plate 102 and the partially reflective and partially transmissive layer 103 can be optimized and calculated by optical simulation software. Light incident on the partially reflective and partially transmissive layer 103 is reflected and refracted at the surface of the medium simultaneously, a portion of the light passes through the layer and enters the diffuser plate 104, and a portion of the light is reflected back into the cavity. The specific transmission and reflection ratio can be reasonably set according to actual conditions. Therefore, as shown in fig. 1, light emitted from the light bar 106 is reflected between the reflective plate 102 and the partially reflective and partially transmissive layer 103, and after a limited number of reflective oscillations, the light is emitted to the diffuser plate 104 side through the partially reflective and partially transmissive layer 103. The light emitted by the light bar is reflected for multiple times in the cavity, and the length of the reflection path can be equivalent to the light mixing distance of the light source, so that the cavity provides enough light mixing distance for the light source, and the light enters the diffusion plate 104 finally and is fully mixed and uniformly emitted from the surface of the diffusion plate 104. Meanwhile, the technical scheme that the lamp strip is suspended in the cavity is adopted, so that the back plate is not limited to a plane structure any more, and the display device can also present a novel shape.
If the light bar 106 is disposed parallel to the diffuser, the light emitted from the light bar is directly incident on the partially reflective and partially transmissive layer 103, which may cause part of the light to enter the diffuser 104 without being reflected in the cavity, and if the distance traveled in the cavity before the part of the emitted light is not long enough, the light cannot be sufficiently mixed, and the brightness of the light emitted from the diffuser 104 is not uniform finally. Therefore, the light emitting direction of the light bar 106 may be set to face the side of the reflective plate 102. As shown in fig. 2a, the light bar 106 includes a circuit board 1061 and a plurality of leds 1062 connected to one side of the circuit board, and the extending direction of the light bar 106 is the direction in which the leds 1062 are arranged as shown in fig. 2 a. Fig. 2b is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. As shown in fig. 2b, in the display device, the extending direction of the light bar (the direction perpendicular to the paper) is parallel to the plane of the diffusion plate 104, the included angle between the plane of the circuit board 1061 (i.e. the plane of the light bar 106) and the plane of the diffusion plate 104 is an acute angle, the light emitting diode 1062 is located on the side of the circuit board 1061 facing the reflection plate 102, and the light emitted by the light emitting diode 1062 is emitted to the reflection plate 102.
In the structure shown in fig. 2b, the light emitted from the led 1062 is first incident on the reflective plate 102 and then reflected to the diffuser plate 104 side. The distance that light reaches partial reflection part for the first time and sees through layer 103 and propagate still can satisfy the requirement of mixing the light distance, from this, can optimize the mixed light effect of lamp strip emergent light, improves the homogeneity of luminance in a poor light.
In the structure of the display device described above, the reflection plate 102 may be composed of a central region and an edge region surrounding the central region, wherein the edge region is folded toward the diffusion plate 104 side and contacts with the edge of the diffusion plate 104, and the brackets are disposed in the central region of the reflection plate 102. The cavity formed by the reflective plate 102 and the partially reflective and partially transmissive layer 103 has a cross section similar to a trapezoid structure with a wide top and a narrow bottom, the partially reflective and partially transmissive layer 103 is located above the cavity, and the central region of the reflective plate 102 is located below the cavity. When incident on the central region of the reflector 102, the light emitted from the led 1062 is reflected back into the cavity and emitted to the edge region or the partially reflective and partially transmissive layer 103 of the reflector 102; when light is incident on the partially reflective and partially transmissive layer 103, part of the light enters the diffusion layer 104, and part of the light is reflected back into the cavity to continue reflection oscillation. When the high-angle outgoing light emitted by the light emitting diode 1062 and approximately parallel to the diffusion plate 104 enters the edge region of the reflection plate 102, the edge region of the reflection plate 102 disposed in an inclined manner can reflect the high-angle outgoing light toward the partially reflective part transmission layer 103, thereby improving the light utilization rate.
After the light is circularly reflected in the cavity for many times, the light intensity of the reflected light in the cavity is gradually attenuated along with the reflection times, and after the light is reflected for limited times, most of the light emitted by the light emitting diode is finally emitted outwards from the partial reflection part to one side of the diffusion plate through the layer 103, and the light mixing effect of the emitted light is good, and the light emitting intensity is relatively uniform.
Fig. 3 is a third schematic cross-sectional view of a display device according to an embodiment of the invention. As shown in fig. 3, the backlight module 100 includes a plurality of light bars 106. Every two light bars 106 form a light bar group, and the light bars are arranged on the same group of brackets 105; the two light bars in the light bar group extend in the same direction (direction uniformly perpendicular to the paper surface), one side edge of each of the two light bars 106 is in contact with each other, and the two light bars are also symmetrically arranged about the first plane; the first plane, which is the plane passing through the dotted line AA' in fig. 3 and perpendicular to the paper, includes the sides of the light bars contacting each other and is perpendicular to the plane of the diffuser plate 104. Fig. 3 only schematically shows that the light bar set and the bracket 105 are fixed together, and therefore the invention is not limited to the specific structure of the bracket 105 and the fixing manner of the bracket 105 and the light bar set, and any possible fixing method is within the scope of the invention. Meanwhile, the present invention provides a feasible way to fix two light bars 106 on two sides of the V-shaped groove respectively by using the bracket with the V-shaped groove on the top.
Through the structure shown in fig. 3, two light bars 106 are combined and fixed, so that more light bars can be arranged in a limited space, and the luminous flux of the backlight module is fully improved. And, for the lamp strip that unilateral set up, the luminous light type also shows symmetric distribution for the lamp strip group of symmetry setting, can further improve the homogeneity in a poor light behind the mixed light of cavity.
When the size of the display device is larger, more light bars are required. Please refer to fig. 4, which is a fourth schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 4, the display device includes a plurality of light bar groups, and the extending direction of each light bar group is a direction perpendicular to the paper surface. The reflective plate 102 includes a protruding edge protruding toward one side of the diffuser plate 104 between two adjacent light bar groups (i.e., a protruding triangular structure of the central reflective plate in fig. 4), and the extending direction of the protruding edge is parallel to the extending direction of the light bar groups; the protruding ribs at least include two inclined planes inclined with respect to the plane of the diffusion plate 104, and the inclined planes are disposed corresponding to the adjacent light bar groups and used for reflecting the light rays incident from the corresponding light bar groups to one side of the diffusion plate 104. Fig. 4 only shows the condition that one inclined plane reflects the light emitted by the corresponding light bar, and the convex inclined plane can reflect the light emitted by the corresponding light bar and parallel to the diffusion plate 104 to the partially reflective partially transmissive layer 103, so as to prevent the light from forming a dead cycle in the cavity, thereby improving the light utilization rate and the uniformity of the backlight as a whole. In addition, the protruding rib may also have a trapezoidal structure or other structures with the above-mentioned inclined surface, which may also play the above-mentioned role, and is not limited herein.
In any of the above structures, there may still be a case where the light intensity on the light exit side of the diffusion plate 104 is not uniform, and if the light intensity of the light exiting from a relatively large area can be appropriately reduced, the backlight uniformity can be further improved. Please refer to fig. 5, which is a fifth structural schematic diagram of a display device according to an embodiment of the present invention. As shown in fig. 5, the display device further includes a light shielding structure 107 located on a surface of the diffusion plate 104 facing away from the partially reflective transmissive layer 103, where the light shielding structure 107 is disposed in a set area of the diffusion plate 104, and the intensity of the emergent light in the set area is greater than a preset threshold. The light shielding structure 107 may attenuate the intensity of the emergent light in a set region, and the attenuation coefficients of the light shielding structures in different regions to the intensity of the emergent light may be different. In a specific implementation, the light shielding structure 107 may be a dot formed by gray ink, and the larger the size of the dot, the denser the distribution, and the larger the attenuation coefficient of the light intensity. Through carrying out fitting analysis on actual light intensity distribution of the light-emitting surface, the mesh points of each area are reasonably arranged, originally over-bright light rays of partial areas are properly weakened, and the uniformity of backlight is further improved.
Generally, the heat generated by the lamp strip should be timely derived to ensure the stability of light emission. Fig. 6a and fig. 6b are schematic structural views of a light bar according to an embodiment of the present invention, where fig. 6a is a schematic cross-sectional structure and fig. 6b is a perspective view. The light bar group consisting of the two light bars 106 is fixed on the same group of brackets 105. The side of the circuit board 1061 facing away from the leds (not shown in fig. 6 a) is attached to a heat sink 1064 by a thermally conductive glue 1063. The material of the thermal conductive paste 1063 may be thermal conductive silicone grease. The surface of heat sink 1064 may also be coated with a reflective layer to reflect light incident on heat sink 1064 back into the cavity, reducing light loss. The heat radiator 1064 can rapidly guide out the heat generated by the light bar, so as to ensure the stability of the backlight module.
In addition, in any of the above devices, light may contact the holder while circulating in the cavity. The bracket is made of transparent materials, such as polymethyl acrylate, so that the bracket is prevented from shielding the light of the cavity, and the uniformity of backlight is further improved.
In any of the above devices, the reflective plate 102 may be composed of a substrate and white ink coated on a surface of the substrate facing away from the back plate 101. In a feasible embodiment, the substrate of the reflector 102 is made of polycarbonate, a layer of white high-reflection ink with a reflectivity of 97% is coated on the surface of the reflector, and the reflector is designed to be matched in structure according to the light distribution of the suspended lamp panel, so as to ensure uniform reflection of light and improve the uniformity of backlight.
In a second aspect, the present invention provides a backlight module. Fig. 7 is a schematic cross-sectional view of a backlight module according to the present invention. As shown in fig. 7, the backlight module 100 includes: a back plate 101, a reflective plate 102 disposed on a surface of the back plate 101, a diffuser plate 104 disposed on a side of the reflective plate 102 facing away from the back plate 101, a partially reflective transmissive layer 103 disposed on a surface of the diffuser plate 104 facing the reflective plate 102, a bracket 105 fixed on the reflective plate 102, and a light bar 106 mounted on the bracket; the reflecting plate 102 and the diffusing plate 104 form a hollow cavity; the bracket 105 is used for supporting the light bar 106, so that the light bar 106 has a set distance with the reflective plate 102 and the partially reflective and partially transmissive layer 103; the reflective plate 102 and the partially reflective and partially transmissive layer 103 are used for reflecting part of the emergent light of the light bar 106 in the cavity for a limited number of times and then emitting the emergent light from one side of the diffusion plate 104.
The backlight module 100 provided in the embodiment of the present invention may be any possible structure of the backlight module 100 in the display device provided in the embodiment of the present invention, and the specific implementation manner and the working principle thereof may refer to the specific embodiment of the display device, and repeated details are not repeated.
The backlight module provided by the embodiment of the invention comprises: the LED backlight module comprises a back plate, a reflecting plate, a diffusion plate, a partial reflection part transmission layer, a support and a light bar, wherein the reflecting plate is positioned on the surface of the back plate, the diffusion plate is positioned on one side of the reflecting plate, which is away from the back plate, the partial reflection part transmission layer is positioned on the surface, facing the reflecting plate, of the diffusion plate, the support is fixed on the reflecting plate; the reflecting plate and the diffusion plate form a hollow cavity; the support is used for supporting the light bar, so that the light bar has a set distance with the reflecting plate and the partial reflecting part transmission layer; the reflecting plate and the partial reflecting part transmitting layer are used for enabling partial emergent light rays of the light bar to be emitted outwards from one side of the diffusing plate after being reflected for a limited time in the cavity. The light rays emitted by the lamp strip can be emitted after being circularly reflected in the cavity, the cavity provides enough light mixing distance for the lamp strip, and finally the light rays are uniformly emitted by the emergent light of the diffusion plate, so that uniform backlight is provided for the display device. Because the lamp strip is maked somebody a mere figurehead in the cavity by the support, the backplate molding is not restricted by the lamp strip, can design for non-planar structure, satisfies display device's pleasing to the eye demand.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a display device which characterized in that, includes backlight unit and is located the display panel of backlight unit light-emitting side, wherein, backlight unit includes: the LED backlight module comprises a back plate, a reflecting plate, a diffusion plate, a partially reflecting and partially transmitting layer, a support and a light bar, wherein the reflecting plate is positioned on the surface of the back plate, the diffusion plate is positioned on one side of the reflecting plate, which is away from the back plate, the partially reflecting and partially transmitting layer is positioned on the surface, which faces the reflecting plate, of the diffusion plate, the support is fixed on the reflecting plate, and the light; the reflecting plate and the diffusion plate form a hollow cavity;
the support is used for supporting the light bar, so that a set distance exists between the light bar and the reflecting plate and between the light bar and the partially reflecting and partially transmitting layer;
the reflecting plate and the partial reflecting partial transmitting layer are used for enabling partial emergent light rays of the light bar to be emitted outwards from one side of the diffusion plate after being reflected for a limited time in the cavity.
2. The display device of claim 1, wherein the light bar comprises: the LED lamp comprises a circuit board and a plurality of LEDs connected to one side of the circuit board;
the extending direction of the light bar is parallel to the plane of the diffusion plate, the included angle between the plane of the circuit board and the plane of the diffusion plate is an acute angle, and the light emitting diode is positioned on one side of the circuit board facing the reflection plate.
3. The display device according to claim 1, wherein the reflection plate includes: a central region and an edge region surrounding the central region; the edge area is folded towards one side of the diffusion plate to be in contact with the edge of the diffusion plate;
the bracket is disposed in a central region of the reflection plate.
4. The display device of claim 2, wherein the backlight module comprises: a plurality of the light bars;
the two lamp strips form a lamp strip group, and the lamp strip group is arranged on the same group of brackets;
the extending directions of the two light bars in the light bar group are the same, one side edges of the two light bars are in contact with each other, and the two light bars are symmetrically arranged around a first plane; the first plane comprises the sides of the light bars which are contacted with each other, and the first plane is perpendicular to the plane of the diffusion plate.
5. The display device according to claim 4, wherein the display device includes a plurality of the lamp strip groups, and the extending directions of the lamp strip groups are the same;
the reflecting plate comprises a convex edge protruding towards one side of the diffusion plate between two adjacent lamp strip groups, and the extending direction of the edge of the convex edge is parallel to the extending direction of the lamp strip groups;
the convex edges at least comprise two inclined planes which are inclined relative to the plane where the diffusion plate is located, the inclined planes are arranged corresponding to the adjacent light bar groups, and the inclined planes are used for reflecting light rays incident from the corresponding light bar groups to one side of the diffusion plate.
6. The display device of claim 1, wherein the display device further comprises: the light shading structure is arranged on one side surface, deviating from the partial reflection part transmission layer, of the diffusion plate, the light shading structure is arranged in a set area of the diffusion plate, and the emergent light intensity of the set area is larger than a preset threshold value.
7. The display device of claim 2, wherein the light bar further comprises: and the radiator is positioned on one side of the circuit board, which is far away from the light-emitting diode, and is bonded with the circuit board through heat-conducting glue.
8. The display apparatus according to any one of claims 1 to 7, wherein the support is a transparent support.
9. The display device according to any one of claims 1 to 7, wherein the reflective plate comprises a substrate and white ink applied to a surface of the substrate facing away from the back plate.
10. A backlight module, comprising:
the LED backlight module comprises a back plate, a reflecting plate, a diffusion plate, a partially reflecting and partially transmitting layer, a support and a light bar, wherein the reflecting plate is positioned on the surface of the back plate, the diffusion plate is positioned on one side of the reflecting plate, which is away from the back plate, the partially reflecting and partially transmitting layer is positioned on the surface, which faces the reflecting plate, of the diffusion plate, the support is fixed on the reflecting plate, and the light; the reflecting plate and the diffusion plate form a hollow cavity;
the support is used for supporting the light bar, so that a set distance exists between the light bar and the reflecting plate and between the light bar and the partially reflecting and partially transmitting layer;
the reflecting plate and the partial reflecting partial transmitting layer are used for enabling partial emergent light rays of the light bar to be emitted outwards from one side of the diffusion plate after being reflected for a limited time in the cavity.
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|---|---|---|---|
| CN201910923276.XA CN112578589A (en) | 2019-09-27 | 2019-09-27 | Display device and backlight module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910923276.XA CN112578589A (en) | 2019-09-27 | 2019-09-27 | Display device and backlight module |
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| CN112578589A true CN112578589A (en) | 2021-03-30 |
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| WO2023109197A1 (en) * | 2021-12-13 | 2023-06-22 | 荣耀终端有限公司 | Reflective paper, backlight module and display device |
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