CN106773294B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN106773294B CN106773294B CN201611189970.6A CN201611189970A CN106773294B CN 106773294 B CN106773294 B CN 106773294B CN 201611189970 A CN201611189970 A CN 201611189970A CN 106773294 B CN106773294 B CN 106773294B
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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
- G02F1/133608—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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight module, which comprises a back plate and a plurality of light-emitting units which are sequentially spliced and fixed on the back plate, wherein each light-emitting unit comprises a light source component and a light guide piece which is arranged adjacent to the light source component, the light guide part comprises a base part and an extension part, the base part is fixed to the back plate and is provided with a first reflecting surface far away from the back plate, the extending part is arranged at one end of the main part far away from the light source component and is provided with a second reflecting surface far away from the back plate, the second reflective surface is in smooth connection with the first reflective surface to form an upper reflective surface of the light guide member together, the upper reflecting surface is used for reflecting the light rays emitted by the light source component to the direction far away from the back plate, an accommodating space is formed between the extending part and the back plate and is used for accommodating the light source components of the adjacent light emitting units. The backlight module is uniform in light emitting. The invention also discloses a display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
Currently, large size and thin profile are a development trend of liquid crystal television (LCD TV). Meanwhile, Local dimming (Local dimming) is performed on a large-sized TV backlight, so as to realize accurate light control of High-dynamic range (HDR), which is also a direction of technology development in the industry.
Conventional LCD TV modules can be classified into direct type backlight modules and side type backlight modules. The direct type backlight module is affected by the size of the LED secondary lens and the light emitting angle, and has poor performance in thinning. The thickness of the lateral backlight module is thinner than that of the direct backlight module, however, the light emitting mode is that the whole light guide plate emits light, and due to the limitation of the material and the strength of the light guide plate, the lateral backlight module is difficult and heavy in large size, and uneven light emission is easy to occur.
Disclosure of Invention
The invention aims to provide a backlight module with uniform light emission.
In addition, a display device using the backlight module is also provided.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
on one hand, the backlight module comprises a back plate and a plurality of light-emitting units which are sequentially spliced and fixed on the back plate, each light-emitting unit comprises a light source component and a light guide piece which is arranged adjacent to the light source component, the light guide part comprises a base part and an extension part, the base part is fixed to the back plate and is provided with a first reflecting surface far away from the back plate, the extending part is arranged at one end of the main part far away from the light source component and is provided with a second reflecting surface far away from the back plate, the second reflective surface is in smooth connection with the first reflective surface to form an upper reflective surface of the light guide member together, the upper reflecting surface is used for reflecting the light rays emitted by the light source component to the direction far away from the back plate, an accommodating space is formed between the extending part and the back plate and is used for accommodating the light source components of the adjacent light emitting units.
The light source assembly comprises a collimating lens and a plurality of light sources which are arranged at intervals, the collimating lens comprises a light inlet surface and a light outlet surface which are oppositely arranged, and light rays emitted by the plurality of light sources enter the collimating lens through the light inlet surface and are emitted from the light outlet surface after being mixed.
The light incident surface is provided with a light incident area which is concave towards the inside of the collimating lens, the light sources are arranged right opposite to the light incident area, the light emergent surface comprises a convex cambered surface and planes arranged on two sides of the cambered surface, and the cross-sectional area of the collimating lens is gradually increased from the light incident surface to the light emergent surface.
The light emitting direction of the light source component is parallel to the back plate, and in the light emitting direction of the light source component, the upper reflecting surface comprises a first rising surface, a falling surface and a second rising surface which are sequentially connected.
The light source assembly comprises a light source assembly, a backboard, a first ascending surface, a second ascending surface and a third ascending surface, wherein a first interval is formed between the light emitting center of the light source assembly and the backboard, the end portion of the first ascending surface, which is connected with the descending surface, and a second interval is formed between the backboard and the end portion of the second ascending surface, which is far away from the descending surface, and the first interval is larger than the second interval and smaller than the third interval.
The backlight module also comprises an optical diaphragm group arranged opposite to the back plate and a frame connected between the back plate and the optical diaphragm group, and light rays reflected by the upper reflecting surface are emitted out of the backlight module through the optical diaphragm group.
The optical film group comprises an extension part, a base part and a plurality of protrusions, wherein the extension part is provided with a plurality of protrusions at intervals at one end far away from the base part, and the protrusions are used for abutting and supporting the optical film group.
The light emitting units are spliced into rows, and the reflecting plates are arranged between every two adjacent rows of the light emitting units.
Wherein a gap is formed between the reflection plate and the optical film group.
On the other hand, a display device is also provided, which comprises the backlight module.
Compared with the prior art, the invention has the following beneficial effects:
because the accommodating space can be used for accommodating adjacent light-emitting units the light source assembly is located two adjacent between this portion of leaded light spare the light source assembly can be accommodated in one of them leaded light spare in the accommodating space to make accommodate in the accommodating space light that the light source assembly sent by go up the plane of reflection and reflect out backlight unit avoids the light of light source assembly is from two the clearance between this portion directly jets out and forms the bright line, makes the light-emitting intensity of light-emitting unit middle zone with link up other the light-emitting intensity of the marginal zone of light-emitting unit is comparatively unanimous, backlight unit light-emitting is even, uses backlight unit display device display quality is high.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the invention.
Fig. 3 is an enlarged schematic view of the structure at iii in fig. 2.
Fig. 4 is a schematic perspective view of a light-emitting unit of the backlight module shown in fig. 2.
Fig. 5 is a result of an image optical simulation of a model provided with two light-emitting units as shown in fig. 4.
Fig. 6 is a numerical optical simulation result of a model provided with two light-emitting units shown in fig. 4.
FIG. 7 is an enlarged schematic view of the structure at VII in FIG. 4.
Fig. 8 is a front view of a collimating lens of the backlight assembly shown in fig. 2.
Fig. 9 is a light-emitting angle diagram of a light source assembly of the backlight module shown in fig. 2.
Fig. 10 is a schematic structural diagram of another light source module provided in the embodiments of the present invention.
Fig. 11 is a front view of a light guide member of the backlight module shown in fig. 2.
Fig. 12 is a schematic perspective view of a part of the backlight module shown in fig. 2.
FIG. 13 is a schematic view of a connection relationship of the backlight module shown in FIG. 2.
Detailed Description
Embodiments of the present application are described below with reference to the accompanying drawings.
Referring to fig. 1 to 4, a display device 100 is provided according to an embodiment of the invention. The display device 100 includes a display panel 1 and a backlight module 2, which are stacked, and the backlight module 2 is configured to provide a backlight source for the display panel 1. The display panel 1 may be a liquid crystal display panel, and the display device 100 is a liquid crystal display.
The backlight module 2 comprises a back plate 21 and a plurality of light emitting units 22 which are sequentially spliced and fixed on the back plate 21. Each of the light emitting units 22 includes a light source assembly 221 and a light guide 222 disposed adjacent to the light source assembly 221. The light guide 222 includes a base 223 and an extending portion 224, the base 223 is fixed to the back plate 21, the base 223 has a first reflecting surface 2231 far away from the back plate 21, the extending portion 224 is disposed at one end of the base 223 far away from the light source assembly 221 and has a second reflecting surface 2241 far away from the back plate 21, the second reflecting surface 2241 is smoothly connected to the first reflecting surface 2231 to form an upper reflecting surface 2221 of the light guide 222, and the upper reflecting surface 2221 is used for reflecting the light emitted from the light source assembly 221 to a direction far away from the back plate 21. An accommodating space 220 is formed between the extending portion 224 and the back plate 21, and the accommodating space 220 is used for accommodating the light source assembly 221 of the adjacent light emitting unit 22. The extending portion 224 can block the large-angle light emitted by the light source assembly 221 received in the receiving space 220.
In this embodiment, since the receiving space 220 can be used to receive the light source modules 221 of the adjacent light-emitting units 22, the light source modules 221 located between the local portions 223 of the two adjacent light-guiding members 222 can be received in one of the light-guiding members 222 in the receiving space 220, so that the light emitted by the light source modules 221 received in the receiving space 220 is reflected by the upper reflecting surface 2221 out of the backlight module 2, thereby preventing the light of the light source modules 221 from being directly emitted from the gap between the two local portions 223 to form a bright line, so that the light intensity in the middle area of the light-emitting units 22 is consistent with the light intensity in the edge area connecting the other light-emitting units 22, the light emitted by the backlight module 2 is uniform, and the display device 100 using the backlight module 2 has high display quality.
As shown in fig. 5 and 6, fig. 5 is an optical simulation result of an image format provided with two models of the light-emitting unit 22 according to the present embodiment, and the light intensity is represented by the light intensity, and the light intensity is stronger when the color is darker, and the light intensity is weaker when the color is darker. Fig. 6 shows the result of numerical optical simulation of the light-emitting unit 22 model of the present embodiment, and the variation of the illumination intensity is achieved by a curve chart formed by connecting the numerical values in series. As can be seen from fig. 5 and 6, in the vertical direction, the illuminance uniformity (the percentage of the minimum value divided by the maximum value in the illuminance measurement values, i.e., MIN/MAX × 100%) of the light-emitting intensity of the middle region of the light-emitting unit 22 and the light-emitting intensity of the edge regions adjoining the other light-emitting units 22 can reach 85%. The optical simulation result shows that the present embodiment can meet the requirements of large size and thinness of the backlight module 2, and has realizability.
It can be understood that, in this embodiment, the backlight module 2 adopts a structure without a light Guide plate (Air Guide), so that the cost is saved, and meanwhile, the phenomenon of firefly (Hotspot) can be avoided, so that the optical quality of the backlight module 2 and the display effect of the display device 100 are improved. The second reflecting surface 2241 is smoothly connected to the first reflecting surface 2231 to form the upper reflecting surface 2221 of the light guide 222, so that the upper reflecting surface 2221 is entirely smooth and continuous, which is beneficial to the uniform light emission of the backlight module 2.
Because it is a plurality of the light-emitting unit 22 splices in proper order and fixes on backplate 21, accessible structure fixed connection each other between a plurality of light-emitting unit 22, the equipment is convenient. Meanwhile, the number of the light emitting units 22 can be increased according to design requirements, so as to meet the requirement of the display device 100 on large size. The term "sequentially" in this embodiment means to be arranged in a certain direction, and does not limit the installation sequence.
The light guide 222 of the light emitting unit 22 may be fixed to the back plate 21 by a fastener, or may be fixed to the back plate 21 by bonding. Including but not limited to screws, rivets, etc.
In one embodiment, the base 223 and the extension 224 are integrally formed, so that the light guide 222 is processed with precise dimensions, and the upper reflective surface 2221 of the light guide 222 has a good reflective effect. In other embodiments, the extension 224 may also be secured to the body by adhesive, fastener connection, threaded connection, bayonet connection, or the like.
Optionally, the light guide 222 is made of a white plastic material or a white rubber material, so that the upper reflecting surface 2221 of the light guide 222 can reflect the light emitted by the light source assembly 221, and the reflecting characteristic of the upper reflecting surface 2221 has a gaussian scattering angle. Of course, in other embodiments, the light guide 222 may also be made of other materials, and the upper reflecting surface 2221 of the light guide 222 can reflect light by attaching a white reflecting sheet or coating a reflective coating on the upper reflecting surface 2221.
Referring to fig. 3, 4, 7 and 8, as an alternative embodiment, the light source module 221 includes a collimating lens 2211 and a plurality of light sources 2212 arranged at intervals. The collimating lens 2211 includes a light incident surface 2213 and a light emitting surface 2214, which are disposed opposite to each other, and the light rays emitted from the light sources 2212 enter the collimating lens 2211 through the light incident surface 2213 to be mixed and then exit from the light emitting surface 2214. The collimator lens 2211 is substantially in a shape of a bar, the cross section of the collimator lens 2211 is substantially in a shape of a bowl, and the plurality of light sources 2212 are arranged at intervals in the extending direction of the collimator lens 2211.
For example, the Light sources 2212 are lambertian 120 ° Light Emitting Diodes (LEDs), and fig. 9 is a Light exit angle diagram of the Light rays emitted by the Light sources 2212 after passing through the collimating lens 2211, that is, a Light exit angle diagram of the Light source assembly 221. As shown in fig. 9, the light pattern of the light passing through the collimating lens 2211 is still 120 ° in the vertical direction, but is focused in the horizontal direction, and the light emitting angle is reduced to about 7 °, so that the collimating lens 2211 focuses and converges the light emitted from the light sources 2212 in this embodiment.
In this embodiment, the collimating lens 2211 is configured to converge the light beams emitted by the light sources 2212, and is configured to realize a thinner light mixing height, so that the light-emitting angle of the light source assembly 221 is small, the light-emitting is concentrated, and the propagation distance is long, and each region of the upper reflecting surface 2221 of the light guide member 222 can sufficiently reflect the light beams emitted by the light source assembly 221, so as to improve the illuminance uniformity of the backlight module 2, and the light-emitting of the backlight module 2 is more uniform. The plurality of light sources 2212 are uniformly emitted from the light emitting surface 2214 after being mixed in the same collimating lens 2211, so that the light energy utilization rate and the light mixing quality of the plurality of light sources 2212 are improved. On the premise of ensuring the light quality, the gap (pitch) between the light sources 2212 allowed by the light source assembly 221 of the present embodiment is larger than that of the conventional edge-type backlight module 2, so that the number of the light sources 2212 can be reduced, and the cost of the backlight module 2 can be reduced.
It can be understood that the light of the light source assembly 221 is emitted from the light emitting surface 2214, that is, the light is emitted from the whole surface, so that a firefly (Hotspot) phenomenon can be effectively avoided, and the optical quality of the backlight module 2 and the display effect of the display device 100 are improved. Compared with the traditional direct type backlight module 2, the light source assembly 221 avoids the problem of lamp shadow taste and realizes a thinner light mixing distance.
Optionally, the light incident surface 2213 is provided with a light incident region 2215 recessed towards the inside of the collimating lens 2211, and the light sources 2212 are disposed opposite to the light incident region 2215, so that light rays emitted by the light sources 2212 can directly enter the collimating lens 2211 through the light incident region 2215. The interface 2218 of the light inlet area 2215 may be substantially wave-shaped and include a protrusion and recesses on both sides of the protrusion.
The light emitting surface 2214 comprises a convex arc surface and planes arranged on two sides of the arc surface. The arc surface is located at the center of the light emitting surface 2214, and the planes are symmetrically arranged on two sides of the arc surface.
The cross-sectional area of the collimating lens 2211 gradually increases from the light incident surface 2213 to the light emitting surface 2214. For example, the collimating lens 2211 further includes a side surface 2216 connected between the light incident surface 2213 and the light emitting surface 2214, and the side surface 2216 is convex away from the geometric center of the collimating lens 2211, so that the cross section of the collimating lens 2211 is substantially bowl-shaped.
Optionally, referring to fig. 3, 4 and 10, the light source assembly 221 further includes a lamp panel 2217, and the plurality of light sources 2212 are fixed to the lamp panel 2217 at intervals. The plurality of light sources 2212 may be fixed to the lamp panel 2217 through a work-piece process. The lamp panel 2217 is accommodated in the accommodating space 220, and the lamp panel 2217 can be fixed to the side surface of the base 223 of the light guide piece 222, which faces the accommodating space 220.
Referring to fig. 3 and fig. 11, as an alternative embodiment, the light emitting direction of the light source module 221 is parallel to the back plate 21. The light-emitting direction of the light source module 221 refers to the central direction (the direction of the arrow shown in fig. 3) of the light emitted from the light source module 221. In the light emitting direction of the light source assembly 221, the upper reflecting surface 2221 includes a first rising surface 2222, a falling surface 2223, and a second rising surface 2224, which are connected in sequence, that is, the distance between the upper reflecting surface 2221 and the back plate 21 tends to gradually increase, gradually decrease, and gradually increase again.
In this embodiment, since the light-exiting angle of the light source assembly 221 is small, the first raised surface 2222 is configured to directly reflect a part of the light emitted from the light source assembly 221, so that the region near the light source 2212 of the light-exiting unit 22 has enough light. A light mixing region is formed between the descending surface 2223 and the second ascending surface 2224, most of the light emitted from the light source assembly 221 is mixed in the light mixing region and then emitted out of the light emitting unit 22, so that the area of the far light source 2212 of the light emitting unit 22 has enough light and uniform brightness.
For example, a first distance is formed between the light emitting center 2210 of the light source assembly 221 and the back plate 21, a second distance is formed between the end of the first rising surface 2222 connecting the descending surface 2223 and the back plate 21, and a third distance is formed between the end of the second rising surface 2224 away from the descending surface 2223 and the back plate 21, wherein the first distance is greater than the second distance and smaller than the third distance.
In this embodiment, the upper reflecting surface 2221 has a substantially wave shape. The first distance is greater than the second distance, so that most of the light emitted from the light source module 221 enters the light mixing region, and a small part of the light is directly reflected by the first rising surface 2222, which is beneficial to the uniformity of the light emitted from the backlight module 2. The first distance is smaller than the third distance, so that the light emitted from the light source module 221 is sufficiently reflected, and interference to the light emitted from the adjacent light emitting units 22 is avoided.
Referring to fig. 2 and fig. 3, as an alternative embodiment, the backlight module 2 further includes an optical film group 23 disposed opposite to the back plate 21 and a frame 24 connected between the back plate 21 and the optical film group 23, and the light reflected by the upper reflecting surface 2221 exits the backlight module 2 through the optical film group 23. At this time, the light emitting units 22 are located between the optical film group 23 and the back plate 21.
The optical film group 23 includes a Diffusion plate (Diffusion Sheet), a prism Sheet (Len orPrism Sheet), and a Diffusion film, which are stacked, and the Diffusion plate is located between the prism Sheet and the light emitting unit 22. The diffusion plate is used for uniformly diffusing the light reflected by the upper reflection surface 2221 and refracting the light by a predetermined angle. The prism lens enables the scattered and diffused light passing through the diffusion plate to be vertically emitted upwards through the refraction of the prism lens, and light collection is achieved. The diffusion film is mainly used for preventing the prism sheet from being scratched. The diffusion plate may be made of PET or PC resin.
In one embodiment, the frame 24 abuts the optical film stack 23 for support.
In another embodiment, a plurality of support protrusions (support pins) are spaced apart from one end of the extension portion 224 away from the base portion 223, and are used for abutting and supporting the optical film group 23. The arrangement of the supporting protrusions can reduce the thickness of the frame 24, and also can effectively support both the middle region and the edge region of the optical film group 23. The plurality of supporting protrusions are arranged at intervals, and the number and the positions of the plurality of supporting protrusions are strictly controlled, so that the influence of the arrangement of the plurality of supporting protrusions on the condition that light enters the optical film group 23 is small, and the influence on the light emitting quality of the backlight module 2 is avoided. The plurality of support protrusions may be integrally formed with the extension 224. Or may be secured to the extension 224 by adhesive or snap-fit attachment.
It can be understood that a distance is always formed between the upper reflecting surface 2221 and the optical film set 23, and a small gap (for example, 2mm to 3mm) is formed between the end of the second rising surface 2224 away from the falling surface 2223 and the optical film set 23, so that light interference between the adjacent light emitting units 22 hardly occurs, and meanwhile, it can be ensured that enough light enters the area where the optical module is directly opposite to the end of the second rising surface 2224 away from the falling surface 2223, a dark line is prevented from occurring on the optical film set 23, and the light emitted by the backlight module 2 is uniform.
Of course, in other embodiments, the upper reflecting surface 2221 may directly abut against and support the optical film group 23.
Alternatively, the light source assembly 221 (defined as a first light source assembly 221) fixed at the edge of the back plate 21 and disposed adjacent to the bezel 24 may be fixed to the bezel 24. Specifically, the lamp panel 2217 and the collimating lens 2211 of the first light source assembly 221 may be fixed to the bezel 24. The backlight module 2 further includes a peripheral reflector 25, where the peripheral reflector 25 is located at the periphery of the optical film set 23 and is used for shielding light so as to form an opaque region at the periphery of the backlight module 2. The first light source assembly 221 is disposed right opposite to the peripheral reflection plate 25, so that the peripheral reflection plate 25 can shield the large-angle light emitted by the first light source assembly 221, and the light of the first light source assembly 221 is prevented from being directly emitted to form a bright line, so that the light emitted by the backlight module 2 is more uniform, and the display quality of the display device 100 is high.
Referring to fig. 2, fig. 3 and fig. 12, as an alternative embodiment, at least two light emitting units 22 are spliced into a row, a plurality of rows of the light emitting units 22 are sequentially arranged in a column direction, and the light emitting units 22 are arranged in a matrix. The light guide members 222 and the light source assemblies 221 in each row of the light emitting unit 22 are alternately arranged (i.e., a light source assembly 221 is disposed between two adjacent light guide members 222, and a light guide member 222 is disposed between two adjacent light source assemblies 221). A reflective plate 26 is disposed between two adjacent rows of light-emitting units 22, and is used for separating each light-emitting unit 22, so that light of each light-emitting unit 22 is reflected inside the light-emitting unit, and does not reach other adjacent light-emitting units 22, thereby reducing light interference between adjacent light-emitting units 22, and improving accuracy of High-Dynamic light rendering (HDR) light control.
Optionally, the height of the reflection plate 26 is substantially the same as the height of the light guide 222 (excluding the support protrusions). The reflection plate 26 is vertically fixed on the back plate 21, that is, the reflection plate 26 is perpendicular to the back plate 21. The reflective plate 26 may be attached to the back plate 21 by bonding, clamping, or the like. Of course, in other embodiments, the height of the reflective plate 26 may be slightly lower than the height of the light guide 222 (excluding the supporting protrusions).
A small gap (for example, 2mm to 3mm) is formed between the reflective plate 26 and the optical film group 23, so that light interference hardly occurs between the adjacent light emitting units 22, and meanwhile, enough light can be ensured to enter the area of the optical module, which is just opposite to the reflective plate 26, to prevent dark lines from occurring on the optical module, so that the light emitted from the backlight module 2 is uniform.
Referring to fig. 13, as an alternative embodiment, the backlight module 2 further includes a controller 27, and the controller 27 is electrically connected to a plurality of light source assemblies 221 of the light-emitting units 22 and can independently control the light source assemblies 221 of each of the light-emitting units 22.
In this embodiment, the backlight module 2 can flexibly control the light emitting condition of each light emitting unit 22 according to a High-Dynamic Range (HDR) requirement, so as to implement local dimming (local dimming).
The above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the above description of the embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A backlight module is characterized by comprising a back plate and a plurality of light emitting units which are sequentially spliced and fixed on the back plate, wherein each light emitting unit comprises a light source component and a light guide piece which is arranged adjacent to the light source component, the light guide part comprises a base part and an extension part, the base part is fixed to the back plate and is provided with a first reflecting surface far away from the back plate, the extending part is arranged at one end of the main part far away from the light source component and is provided with a second reflecting surface far away from the back plate, the second reflective surface is in smooth connection with the first reflective surface to form an upper reflective surface of the light guide member together, the upper reflecting surface is used for reflecting the light rays emitted by the light source component to the direction far away from the back plate, an accommodating space is formed between the extending part and the back plate and is used for accommodating the light source component of the adjacent light emitting unit; the light emitting direction of the light source component is parallel to the back plate, and the upper reflecting surface comprises a first rising surface, a falling surface and a second rising surface which are sequentially connected in the light emitting direction of the light source component; the light source assembly comprises a light source assembly, a backboard, a first ascending surface, a second ascending surface, a third ascending surface and a third ascending surface, wherein a first interval is formed between the light emitting center of the light source assembly and the backboard, the first ascending surface is connected with the end part of the descending surface and a second interval is formed between the backboard, the second ascending surface is far away from the end part of the descending surface and a third interval is formed between the backboard, and the first interval is larger than the second interval and smaller than the third interval.
2. The backlight module as claimed in claim 1, wherein the light source assembly comprises a collimating lens and a plurality of light sources arranged at intervals, the collimating lens comprises a light incident surface and a light emitting surface which are arranged oppositely, and light rays emitted by the plurality of light sources enter the collimating lens through the light incident surface to be mixed and then are emitted from the light emitting surface.
3. The backlight module as claimed in claim 2, wherein the light incident surface has a light incident area recessed toward the inside of the collimating lens, the light sources are disposed opposite to the light incident area, the light emitting surface includes a convex arc surface and planes disposed at two sides of the arc surface, and the cross-sectional area of the collimating lens gradually increases from the light incident surface to the light emitting surface.
4. The backlight module as claimed in claim 1, wherein the backlight module further comprises an optical film set disposed opposite to the back plate and a frame connected between the back plate and the optical film set, and the light reflected by the upper reflective surface exits the backlight module through the optical film set.
5. The backlight module as claimed in claim 4, wherein a plurality of protrusions are spaced apart from each other at an end of the extension portion away from the base portion, and the protrusions are used for abutting and supporting the optical film group.
6. The backlight module as claimed in claim 4, wherein at least two of the light-emitting units are arranged in a row, and a reflective plate is disposed between two adjacent rows of the light-emitting units.
7. The backlight module as claimed in claim 6, wherein a gap is formed between the reflection plate and the optical film set.
8. A display device comprising the backlight module according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611189970.6A CN106773294B (en) | 2016-12-21 | 2016-12-21 | Backlight module and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611189970.6A CN106773294B (en) | 2016-12-21 | 2016-12-21 | Backlight module and display device |
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| CN106773294A CN106773294A (en) | 2017-05-31 |
| CN106773294B true CN106773294B (en) | 2020-09-04 |
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| CN110133914B (en) * | 2019-05-29 | 2021-12-03 | 深圳市华星光电半导体显示技术有限公司 | Backlight structure, manufacturing method thereof and display device |
| CN115933255B (en) * | 2022-12-30 | 2024-06-18 | 惠科股份有限公司 | Light splitting assembly, backlight module and display module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005235661A (en) * | 2004-02-20 | 2005-09-02 | Citizen Electronics Co Ltd | Backlight |
| CN100468170C (en) * | 2006-02-10 | 2009-03-11 | 鸿富锦精密工业（深圳）有限公司 | Back light system |
| TWM368091U (en) * | 2009-03-06 | 2009-11-01 | Chunghwa Picture Tubes Ltd | Lightweight light guide plate and its backlight module |
| CN105204107B (en) * | 2015-09-11 | 2018-08-24 | 深圳市华星光电技术有限公司 | Liquid crystal display device and its backlight module |
| CN106019709A (en) * | 2016-07-25 | 2016-10-12 | 广州创维平面显示科技有限公司 | Liquid crystal module and liquid crystal display screen |
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Address after: 518132 No. 9-2 Ming Avenue, Guangming New District, Guangdong, Shenzhen Patentee after: TCL China Star Optoelectronics Technology Co.,Ltd. Address before: 518132 No. 9-2 Ming Avenue, Guangming New District, Guangdong, Shenzhen Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |
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