CN115373065A - Side light-entering type backlight module - Google Patents
Side light-entering type backlight module Download PDFInfo
- Publication number
- CN115373065A CN115373065A CN202211016580.4A CN202211016580A CN115373065A CN 115373065 A CN115373065 A CN 115373065A CN 202211016580 A CN202211016580 A CN 202211016580A CN 115373065 A CN115373065 A CN 115373065A
- Authority
- CN
- China
- Prior art keywords
- light
- guide plate
- light guide
- backlight module
- source device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0091—Positioning aspects of the light source relative to the light guide
-
- 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
Abstract
A side-light-entering type backlight module comprises a back plate, a light guide plate, a light source device and a limiting structure. The light guide plate and the light source device are arranged on the back plate, wherein the light outlet of the light source device is aligned with the light inlet side of the light guide plate. The limiting structure is arranged at the top of the light source device, wherein the limiting structure is provided with a first end and a second end which are opposite, the first end is fixed at the top, and the second end extends to the upper part of the light guide plate. The limiting structure is used for preventing the light guide plate from tilting in the vertical direction so as to improve the brightness uniformity of the side-incident type backlight module.
Description
Technical Field
The present invention relates to a side-light-entering backlight module, and more particularly, to a side-light-entering backlight module with improved brightness uniformity.
Background
Fig. 1 shows a conventional side-type backlight module 10. The side-incident backlight module 10 includes a back plate 11, a light source device 12, a light guide plate 13, and a reflective sheet 14. The light source device 12 is fixed on the back plate 11 by an adhesive 16 (e.g., a fixing tape), and has a light emitting element 121 and a light outlet 122. The light emitting element 121 may be, but is not limited to, an LED light bar. The light guide plate 13 and the reflective sheet 14 are disposed on the back plate 11, and the reflective sheet 14 is located between the light guide plate 13 and the back plate 11. The light guide plate 13 has a light incident side 131 and a light emitting side 132, wherein the light incident side 131 is opposite to the light emitting side 132, and the light incident side 131 is tightly attached to the light source device 12. The light exit opening 122 of the light source device 12 is aligned with the light entrance side 131. The light beams L11 and L21 emitted from the light emitting element 121 enter the light guide plate 13 through the light exit opening 122 and the light entrance side 131. The surface of the light incident side 131 has, but is not limited to, a saw-toothed structure to form a light scattering structure 133, wherein the light scattering structure 133 is used for scattering the light beams L11 and L21 emitted from the light emitting device 121. The light exit side 132 of the light guide plate 13 is secured to the back plate 11 by an adhesive 17 (e.g., a securing tape), thereby securing the light guide plate 13 to the back plate. The side-entry backlight module 10 further includes a plurality of reflective dots 15 disposed at the bottom of the light guide plate 13 and located between the back plate 11 and the light guide plate 13. The reflective dots 15 may be, but are not limited to, arc-shaped microstructures.
As shown in fig. 1, after the light beams L11 and L21 emitted from the light source device 12 enter the light guide plate 13 from the light incident side 131, if the incident angle θ of the light beams L11 and L21 in the light guide plate 13 is greater than a threshold value, the light beams L11 and L21 are totally reflected and then linearly propagate in the light guide plate 13. In contrast, when the incident angles θ of the light beams L11 and L21 in the light guide plate 13 are smaller than the threshold value, all or a part of the light beams L11 and L21 are refracted and exit the light guide plate 13, as shown by the light beams L12 and L14 in fig. 1. The reflective sheet 14 under the light guide plate 13 can reflect the light L12 exiting from the bottom of the light guide plate 13 back into the light guide plate 13 to improve the overall utilization of the light energy, as shown by the light L13 in fig. 1. When the light L21 is incident on the reflective dots 15 at the bottom of the light guide plate 13, the reflective dots 15 will reflect the light L21 to generate a light L22 that passes through the light guide plate 13 in the vertical direction. The brightness of each area of the light guide plate 13 can be nearly uniform by controlling the distribution density of the reflective dots 15 at the bottom of the light guide plate 13. Generally, the distribution density of the reflective dots 15 decreases from the light incident side 131 to the light emitting side 132, so that the brightness distribution of the light guide plate 13 can be relatively uniform.
The side-entry backlight module 10 fixes the light guide plate 13 on the back plate 11 by an adhesive 17 to prevent the light guide plate 13 from shifting. However, such design may cause the light incident side 131 of the light guide plate 13 to be tilted to various degrees, as shown in fig. 2. The tilting of the light incident side 131 of the light guide plate 13 may cause a gap between the light incident side 131 and the back plate 11, resulting in a higher brightness at the position of the light incident side 131. In addition, the incident angles θ of the light beams L11 and L21 are also decreased due to the tilting of the light incident side 131 of the light guide plate 13, which increases the ratio of the light beam L14 refracted out from the position close to the light incident side 131, resulting in a higher brightness at the light incident side 131 than at the light exit side 132.
As described above, the conventional side-entry backlight module 10 may have uneven brightness due to the tilting of the light guide plate 13. Therefore, in order to improve the problem, the present invention provides a side-incident backlight module capable of improving the brightness uniformity.
Disclosure of Invention
The present invention is directed to a side-incident backlight module with improved brightness uniformity.
According to the invention, a side-incident backlight module comprises a back plate, a light guide plate, a light source device, a limiting structure and a first reflector plate. The light guide plate is arranged on the back plate, wherein the light guide plate is provided with a light inlet side and a light outlet side, the light inlet side is opposite to the light outlet side, and the light outlet side is fixed on the back plate. The light source device is arranged on the back plate and clings to the light inlet side, wherein the light outlet of the light source device is aligned to the light inlet side. The limiting structure is arranged at the top of the light source device, wherein the limiting structure is provided with a first end and a second end which are opposite, the first end is fixed at the top, and the second end extends to the upper part of the light guide plate. The first reflector plate is arranged between the light guide plate and the back plate.
In one embodiment, the limiting structure is made of a transparent material or a ceramic material.
In one embodiment, the material of the position limiting structure comprises polycarbonate or polymethyl methacrylate.
In one embodiment, the second end has a wedge-shaped guide surface facing the light guide plate.
In one embodiment, the thickness of the limiting structure gradually increases from the first end to the second end.
In one embodiment, the thickness of the limiting structure increases in a stepwise manner from the first end toward the second end.
In one embodiment, the second end includes a limiting bump contacting the light guide plate.
In one embodiment, the surface of the light incident side has a light scattering structure.
In an embodiment, the side-entry backlight module further includes a plurality of reflective dots disposed at the bottom of the light guide plate and between the light guide plate and the first reflective sheet.
In one embodiment, the side-entry backlight module further includes a highly reflective coating layer disposed at the bottom of the position-limiting structure and between the position-limiting structure and the light source device.
In an embodiment, the side-incident backlight module further includes a second reflector disposed above the position-limiting structure, wherein one end of the second reflector extends above the light guide plate, and the second reflector has a plurality of arc-shaped reflective structures located above the light guide plate.
In one embodiment, the arc degree of each arc-shaped reflecting structure is larger as the arc-shaped reflecting structure is closer to the position of the light source device.
In one embodiment, the second reflector further includes a scattering particle coating on the plurality of arc-shaped reflective structures.
Drawings
Fig. 1 shows a conventional side-light-entering backlight module.
Fig. 2 is a schematic diagram illustrating the light guide plate of fig. 1 tilted.
Fig. 3 shows a first embodiment of a side-entry backlight module according to the invention.
Fig. 4 shows a second embodiment of the side-incident backlight module of the present invention.
FIG. 5 shows a third embodiment of a side-incident backlight module according to the present invention.
Fig. 6 shows a fourth embodiment of the side-incident backlight module of the present invention.
Fig. 7 shows a fifth embodiment of a side-incident backlight module according to the invention.
Reference numerals:
side light-in type backlight module 27
11.. Back plate 28.. Limit structure 42.. Light source device
122
131
Adhesive for reflecting dots 322
16. adhesive 33. Light guide plate 47. Adhesive
20
21.. A back plate 333.. A light diffusing structure 482.. A second end
A second reflective sheet for reflecting dots 49 of the light emitting element 35
23
231
233
24.. First reflector plate 3821.. Wedge-shaped guide surface 51.. Back plate
26. adhesive 40. Side light-in type backlight module 521. Light-emitting element
522
53
A light incident side 682
532
533
56. adhesive 693. Arc reflecting structure
58
581
582.. Second end l13.. Light ray
5821
Light ray of the second reflection sheet L21
591
592
593. arc-shaped reflecting structure L4
594
60
Light ray of back plate L7
Light source device
621
622
63. light guide plate
631.. Incident light side
632. light exit side
Light diffusing structure
A first reflective sheet
65
Adhesive article
Adhesive article
Detailed Description
Fig. 3 shows a side-incident backlight module according to a first embodiment of the present invention. The side-entry backlight module 20 shown in fig. 3 includes a back plate 21, a light source device 22, a light guide plate 23, a first reflective sheet 24, a plurality of reflective dots 25, a limiting structure 28 and a highly reflective coating 29. In fig. 3, the back plate 21 has a structure of a 12552type to accommodate the light source device 22. The light source device 22 is fixed on the back plate 21 by an adhesive 26, wherein the adhesive 26 can be, but is not limited to, a fixing tape. The light source device 22 has a light emitting element 221 and a light outlet 222. The light emitting elements 221 may be, but are not limited to, LED light bars. The light emitted from the light emitting element 221 is emitted from the light outlet 222. The light guide plate 23 and the first reflective sheet 24 are disposed on the back plate 21, wherein the first reflective sheet 24 is disposed between the light guide plate 23 and the back plate 21 for reflecting the light exiting from the bottom of the light guide plate 23 back into the light guide plate 23, so as to improve the overall utilization rate of the light energy. The light guide plate 23 has a light incident side 231 and a light emitting side 232, wherein the light incident side 231 is opposite to the light emitting side 232, and the light incident side 231 is tightly attached to the light source device 22. The light exit 222 of the light source 22 is aligned with the light entrance side 231, so the light emitted from the light emitting device 221 enters the light guide plate 23 through the light exit 222 and the light entrance side 231. The surface of the light incident side 231 has, but is not limited to, a saw-tooth structure to form the light scattering structure 233, wherein the light scattering structure 233 is used for performing a light scattering process on the light emitted from the light emitting device 221. The light-emitting side 232 of the light guide plate 23 is fixed on the back plate 21 by the adhesive 27, so that the light guide plate 23 is fixed on the back plate without deviation. The adhesive 27 may be, but is not limited to, a securing tape. The reflective dots 25 are disposed on the bottom of the light guide plate 23 and between the light guide plate 23 and the first reflective sheet 24. The reflective dots 25 may be, but are not limited to, arc-shaped microstructures.
Compared with the side-in backlight module 10 shown in fig. 1, the side-in backlight module 20 of the present invention is provided with an eave-type vertical limiting structure, which includes a limiting structure 28 and a highly reflective coating 29. The position-limiting structure 28 and the high-reflective coating 29 are disposed on the top of the light source device 22, wherein the high-reflective coating 29 is disposed on the bottom of the position-limiting structure 28 and between the position-limiting structure 28 and the light source device 22. The highly reflective coating 29 has good high reflectivity and mirror effect to ensure that the light L3 refracted by the light guide plate 23 is reflected back to the light guide plate 23. The stop structure 28 may be, but is not limited to being, comprised of a ceramic material. The position-limiting structure 28 has a first end 281 and a second end 282 opposite to each other, wherein the first end 281 is fixed on the top of the light source device 22 by an adhesive (not shown), and the second end 282 extends above the light guide plate 23 to press the light guide plate 23. The second end 282 of the position limiting structure 28 can prevent the light incident side 231 of the light guide plate 23 from tilting. The thickness of the position limiting structure 28 gradually increases from the first end 281 to the second end 282 to ensure that the position limiting structure 28 has sufficient mechanical strength to press the light guide plate 23 and avoid deformation of the position limiting structure 28. The second end 282 of the position-limiting structure 28 has a wedge-shaped guide surface 2821 facing the light guide plate 23. The wedge-shaped guide surface 2821 allows the light guide plate 23 to be more easily inserted sideways to a position in close contact with the light source device 22 during assembly.
In the embodiment of fig. 3, the highly reflective coating 29 can also be replaced by other elements having a reflective effect, such as a reflective sheet.
FIG. 4 shows a second embodiment of a side-incident backlight module according to the present invention. The side-entry backlight module 30 shown in fig. 4 includes a back plate 31, a light source device 32, a light guide plate 33, a first reflective sheet 34, a plurality of reflective dots 35, a position-limiting structure 38, and a highly reflective coating 39. In fig. 4, the back plate 31 has a structure of a 12552type to accommodate the light source device 32. The light source device 32 is fixed on the back plate 31 by an adhesive 36, wherein the adhesive 36 can be, but is not limited to, a fixing tape. The light source device 32 has a light emitting element 321 and a light outlet 322. The light emitting elements 321 may be, but are not limited to, LED light bars. The light L4 emitted from the light emitting element 321 is emitted from the light outlet 322. The light guide plate 33 and the first reflective sheet 34 are disposed on the back plate 31, wherein the first reflective sheet 34 is disposed between the light guide plate 33 and the back plate 31 for reflecting the light exiting from the bottom of the light guide plate 33 back into the light guide plate 33, so as to improve the overall utilization rate of the light energy. The light guide plate 33 has a light incident side 331 and a light exiting side 332, wherein the light incident side 331 is opposite to the light exiting side 332, and the light incident side 331 is tightly attached to the light source device 32. The light exit 322 of the light source device 32 is aligned with the light incident side 331, so that the light emitted from the light emitting element 321 enters the light guide plate 33 through the light exit 322 and the light incident side 331. The surface of the light incident side 331 has, but not limited to, a sawtooth structure to form a light scattering structure 333, wherein the light scattering structure 333 is used for scattering light emitted from the light emitting device 321. The light-emitting side 332 of the light guide plate 33 is fixed on the back plate 31 by the adhesive 37, so that the light guide plate 33 is fixed on the back plate without deviation. The adhesive 37 may be, but is not limited to, a securing tape. The reflective dots 35 are disposed on the bottom of the light guide plate 33 and between the light guide plate 33 and the first reflective sheet 34. The reflective dots 35 may be, but are not limited to, arc-shaped microstructures.
Compared with the side-in backlight module 10 shown in fig. 1, the side-in backlight module 30 of the present invention is provided with an eave-type vertical limiting structure, which includes a limiting structure 38 and a highly reflective coating 39. The position-limiting structure 38 and the highly reflective coating 39 are disposed on the top of the light source device 32, wherein the highly reflective coating 39 is disposed on the bottom of the position-limiting structure 38 and between the position-limiting structure 38 and the light source device 32. The highly reflective coating 39 has good high reflectivity and mirror effect to ensure that the light L4 refracted by the light guide plate 33 is reflected back to the light guide plate 33. The stop structure 38 may be, but is not limited to being, comprised of a ceramic material. The position-limiting structure 38 has a first end 381 and a second end 382 opposite to each other, wherein the first end 381 can be fixed on the top of the light source device 32 by an adhesive (not shown), and the second end 382 extends above the light guide plate 33 to support the light guide plate 33. The second end 382 of the position limiting structure 38 can prevent the light incident side 331 of the light guide plate 33 from tilting. The thickness of the position-limiting structure 38 increases stepwise from the first end 381 to the second end 382 to ensure that the position-limiting structure 38 has sufficient mechanical strength to press the light guide plate 33, thereby avoiding deformation of the position-limiting structure 38. The second end 382 of the position-limiting structure 38 has a wedge-shaped guiding surface 3821 facing the light guide plate 33. The wedge-shaped guide surface 3821 allows the light guide plate 33 to be inserted into the light source unit 32 in a lateral direction more easily when assembled.
In the embodiment of fig. 4, the highly reflective coating 39 may also be replaced by other elements having a reflective effect, such as a reflective sheet.
FIG. 5 shows a third embodiment of a side-incident backlight module according to the present invention. The side-entry backlight module 40 shown in fig. 5 includes a back plate 41, a light source device 42, a light guide plate 43, a first reflective sheet 44, a plurality of reflective dots 45, a limiting structure 48, and a second reflective sheet 49. In fig. 5, the back plate 41 has a structure of the 12552type to accommodate the light source device 42. The light source device 42 is fixed on the back plate 41 by an adhesive 46, wherein the adhesive 46 can be, but is not limited to, a fixing tape. The light source device 42 has a light emitting element 421 and a light outlet 422. The light emitting element 421 can be, but is not limited to, an LED light bar. The light L5 emitted from the light emitting device 421 is emitted from the light outlet 422. The light guide plate 43 and the first reflective sheet 44 are disposed on the back plate 41, wherein the first reflective sheet 44 is disposed between the light guide plate 43 and the back plate 41 for reflecting the light exiting from the bottom of the light guide plate 43 back into the light guide plate 43, so as to improve the overall utilization rate of the light energy. The light guide plate 43 has a light incident side 431 and a light emitting side 432, wherein the light incident side 431 is opposite to the light emitting side 432, and the light incident side 431 is tightly attached to the light source device 42. The light exit 422 of the light source device 42 is aligned with the light entrance side 431, so the light L5 emitted from the light emitting element 421 enters the light guide plate 43 through the light exit 422 and the light entrance side 431. The surface of the light incident side 431 has, but is not limited to, a saw-tooth structure to form the light scattering structure 433, wherein the light scattering structure 433 is used for performing light scattering treatment on the light emitted from the light emitting element 421. The light exit side 432 of the light guide plate 43 is fixed to the back plate 41 by the adhesive 47, so that the light guide plate 43 is fixed to the back plate 41 without being displaced. The adhesive 47 may be, but is not limited to, a securing tape. The reflective dots 45 are disposed on the bottom of the light guide plate 43 and between the light guide plate 43 and the first reflective sheet 44. The reflective dots 45 may be, but are not limited to, arc-shaped microstructures.
Compared with the side-in backlight module 10 shown in fig. 1, the side-in backlight module 40 of the present invention is provided with an eave-type vertical limiting structure, which includes a limiting structure 48 and a second reflector 49. The position limiting structure 48 is disposed on the top of the light source device 42, and the second reflection sheet 49 is disposed above the position limiting structure 48. The limiting structure 48 is made of a transparent material, which may be, but not limited to, polycarbonate (PC) or polymethyl methacrylate (PMMA). The position-limiting structure 48 has a first end 481 and a second end 482, wherein the first end 481 can be fixed on the top of the light source device 42 by an adhesive (not shown), and the second end 482 can extend above the light guide plate 43 to press the light guide plate 43. The second end 482 of the position limiting structure 48 can prevent the light incident side 431 of the light guide plate 43 from tilting. The thickness of the position limiting structure 48 gradually increases from the first end 481 to the second end 482 to ensure that the position limiting structure 48 has sufficient mechanical strength to press the light guide plate 43, thereby preventing the position limiting structure 48 from deforming. The second end 482 of the spacing structure 48 has a wedge-shaped guide surface 4821 facing the light guide plate 43. The wedge-shaped guide surface 4821 allows the light guide plate 43 to be more easily inserted sideways to a position in close contact with the light source unit 42 during assembly. The second reflective sheet 49 has a first end 491 and a second end 492 opposite to each other, wherein the first end 491 is fixed on the back plate 41 above the position-limiting structure 48, and the second end 492 extends above the light guide plate 43. The reflective surface of the second reflective sheet 49 facing the light guide plate 43 has a plurality of arc-shaped reflective structures 493 for reflecting the light L5 emitted from the position-limiting structures 48 back to the light guide plate 43. In each of the arc-shaped reflecting structures 493, the arc degree is larger closer to the position of the light source device 42, and conversely, the arc degree is smaller further from the position of the light source device 42. In other words, in the arc-shaped reflecting structure 493 of fig. 5, the larger the arc degree at the left side, the smaller the arc degree at the right side. The second reflective sheet 49 further includes a scattering particle layer 494 on the plurality of arc-shaped reflective structures 493. The scattering particles in the scattering particle layer 494 can achieve diffuse reflection to scatter light in a fixed direction.
Fig. 6 shows a fourth embodiment of the side-incident backlight module of the present invention. The side-entry backlight module 50 shown in fig. 6 includes a back plate 51, a light source device 52, a light guide plate 53, a first reflector 54, a plurality of reflective dots 55, a position-limiting structure 58, and a second reflector 59. In fig. 6, the back plate 51 has a structure of the 12552type to accommodate the light source device 52. The light source device 52 is fixed on the back plate 51 by an adhesive 56, wherein the adhesive 56 can be, but is not limited to, a fixing tape. The light source device 52 has a light emitting element 521 and a light outlet 522. The light emitting element 521 may be, but is not limited to, an LED light bar. The light L6 emitted from the light emitting element 521 is emitted from the light outlet 522. The light guide plate 53 and the first reflective sheet 54 are disposed on the back plate 51, wherein the first reflective sheet 54 is disposed between the light guide plate 53 and the back plate 51 for reflecting the light exiting from the bottom of the light guide plate 53 back into the light guide plate 53, so as to improve the overall utilization rate of the light energy. The light guide plate 53 has a light incident side 531 and a light emitting side 532, wherein the light incident side 531 is opposite to the light emitting side 432, and the light incident side 531 is tightly attached to the light source device 52. The light exit 522 of the light source device 52 is aligned with the light entrance side 531, so that the light L6 emitted from the light emitting element 521 enters the light guide plate 53 through the light exit 522 and the light entrance side 531. The surface of the light incident side 531 has, but is not limited to, a sawtooth structure to form a light scattering structure 533, wherein the light scattering structure 533 is used for performing a light scattering process on the light emitted from the light emitting element 521. The light exit side 532 of the light guide plate 53 is fixed on the back plate 51 by the adhesive 57, so that the light guide plate 53 is fixed on the back plate 51 without deviation. The adhesive 57 may be, but is not limited to, a securing tape. The reflective dots 55 are disposed on the bottom of the light guide plate 53 and between the light guide plate 53 and the first reflective sheet 54. The reflective dots 55 may be, but are not limited to, arc-shaped microstructures.
Compared with the side-in backlight module 10 shown in fig. 1, the side-in backlight module 50 of the present invention is provided with an eave-type vertical limiting structure, which includes a limiting structure 58 and a second reflector 59. The position limiting structure 58 is disposed on the top of the light source device 52, and the second reflection sheet 59 is disposed above the position limiting structure 58. The position limiting structure 58 is made of a transparent material, which may be, but is not limited to, polycarbonate (PC) or polymethyl methacrylate (PMMA). The position-limiting structure 58 has a first end 581 and a second end 582, wherein the first end 581 can be fixed on the top of the light source device 52 by an adhesive (not shown), and the second end 582 extends above the light guide plate 53 to be pressed against the light guide plate 53. The second end 582 of the position limiting structure 58 may prevent the light incident side 531 of the light guide plate 53 from being tilted. The thickness of the position-limiting structure 58 increases stepwise from the first end 581 toward the second end 582 to ensure that the position-limiting structure 58 has sufficient mechanical strength to press the light guide plate 53 and prevent the position-limiting structure 58 from being deformed. The second end 582 of the position limiting structure 58 has a wedge-shaped guide surface 5821 facing the light guide plate 53. The wedge-shaped guide surface 5821 allows the light guide plate 53 to be more easily inserted sideways to a position in which it abuts against the light source device 52 when assembled. The second reflective sheet 59 has a first end 591 and a second end 592, wherein the first end 591 is fixed on the back plate 51 above the limiting structure 58, and the second end 592 extends above the light guide plate 53. The reflective surface of the second reflective sheet 59 facing the light guide plate 53 has a plurality of arc-shaped reflective structures 593 for reflecting the light L6 emitted from the position-limiting structures 58 back to the light guide plate 53. In each of the arc-shaped reflecting structures 593, the arc degree is larger as it is closer to the position of the light source device 52, and conversely, the arc degree is smaller as it is farther from the position of the light source device 52. In other words, in the arc-shaped reflecting structure 593 of fig. 6, the greater the arc degree at the left side, the smaller the arc degree at the right side. The second reflector sheet 59 further includes a scattering particle layer 594 on the plurality of arc-shaped reflecting structures 593. The scattering particles in the scattering particle layer 594 can achieve a diffuse reflection effect to scatter light in a fixed direction.
Fig. 7 shows a fifth embodiment of the side-entry backlight module of the present invention. The side-entry backlight module 60 shown in fig. 7 includes a back plate 61, a light source device 62, a light guide plate 63, a first reflective sheet 64, a plurality of reflective dots 65, a position-limiting structure 68, and a second reflective sheet 69. In fig. 7, the back plate 61 has a structure of the 12552type to accommodate the light source device 62. The light source device 62 is fixed on the back plate 61 by an adhesive 66, wherein the adhesive 66 can be, but is not limited to, a fixing tape. The light source device 62 has a light emitting element 621 and a light outlet 622. The light emitting elements 621 may be, but are not limited to, LED light bars. The light L7 emitted from the light emitting element 621 is emitted from the light outlet 622. The light guide plate 63 and the first reflective sheet 64 are disposed on the back plate 61, wherein the first reflective sheet 64 is disposed between the light guide plate 63 and the back plate 61 for reflecting the light exiting from the bottom of the light guide plate 63 back into the light guide plate 63, so as to improve the overall utilization rate of the light energy. The light guide plate 63 has a light incident side 631 and a light emitting side 632, wherein the light incident side 631 is opposite to the light emitting side 632, and the light incident side 631 is tightly attached to the light source device 62. The light exit 622 of the light source device 62 is aligned with the light incident side 631, so that the light L5 emitted from the light emitting element 621 enters the light guide plate 63 through the light exit 622 and the light incident side 631. The surface of the light incident side 631 has, but is not limited to, a saw-toothed structure to form a light scattering structure 633, wherein the light scattering structure 633 is used for performing a light scattering process on the light emitted from the light emitting element 621. The light-emitting side 632 of the light guide plate 63 is fixed on the back plate 61 by the adhesive 67, so that the light guide plate 63 is fixed on the back plate 61 without deviation. The adhesive 67 may be, but is not limited to, a securing tape. The plurality of reflective dots 65 are disposed on the bottom of the light guide plate 63 and between the light guide plate 63 and the first reflective sheet 64. The reflective dots 65 may be, but are not limited to, arc-shaped microstructures.
Compared with the side-in backlight module 10 shown in fig. 1, the side-in backlight module 60 of the present invention is provided with an eave-type vertical limiting structure, which includes a limiting structure 68 and a second reflector 69. The position limiting structure 68 is disposed on the top of the light source device 62, and the second reflection sheet 69 is disposed above the position limiting structure 68. The position limiting structure 68 is made of a transparent material, which may be, but not limited to, polycarbonate (PC) or polymethyl methacrylate (PMMA). The position-limiting structure 68 has a first end 681 and a second end 682 opposite to each other, wherein the first end 681 can be fixed to the top of the light source device 62 by an adhesive (not shown), and the second end 682 extends above the light guide plate 63 to hold the light guide plate 63. The second end 682 of the position limiting structure 68 can prevent the light incident side 631 of the light guide plate 63 from being tilted. The thickness of the position-limiting structure 68 gradually increases from the first end 681 to the second end 682, so as to ensure that the position-limiting structure 68 has sufficient mechanical strength to press the light guide plate 63 and prevent the position-limiting structure 68 from deforming. The second end 682 of the stopper 68 has a wedge-shaped guide surface 6821 facing the light guide plate 43. The wedge-shaped guide surfaces 6821 allow the light guide plate 63 to be inserted more easily sideways to a position in close contact with the light source device 62 when assembled. The second end 682 of the retention structure 68 includes a retention tab 6822. In the embodiment of fig. 7, only the limiting bumps 6822 of the limiting structure 68 contact the light guide plate 63, so that the contact area between the limiting structure 68 and the light guide plate 63 can be reduced, and the probability of the light L7 being refracted out of the limiting structure 68 can be further reduced. The second reflective sheet 69 has a first end 691 and a second end 692 opposite to each other, wherein the first end 691 is fixed on the back plate 61 above the limiting structure 68, and the second end 692 extends to above the light guide plate 63. The reflective surface of the second reflective sheet 69 facing the light guide plate 63 has a plurality of arc-shaped reflective structures 693 for reflecting the light emitted from the position-limiting structures 68 back to the light guide plate 63. In each of the arc-shaped reflecting structures 693, the arc degree is larger as it is closer to the position of the light source device 62, and conversely, the arc degree is smaller as it is farther from the position of the light source device 62. In other words, in the arc-shaped reflecting structure 693 of fig. 7, the greater the arc degree at the left side, the smaller the arc degree at the right side. The second reflector 69 further includes a scattering particle layer 694 on the plurality of curved reflective structures 693. The scattering particles in the scattering particle layer 694 can achieve diffuse reflection to scatter light in a fixed direction.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the invention, such as using the limiting structure 68 in fig. 7 instead of the limiting structures 28 and 58 in fig. 3 and 6, or changing the limiting structure 68 in fig. 7 into a stepped structure, but all the simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the invention are still within the scope of the invention.
Claims (14)
1. A side-in backlight module, comprising:
a back plate;
the light guide plate is arranged on the back plate and provided with a light inlet side and a light outlet side, the light inlet side is opposite to the light outlet side, and the light outlet side is fixed on the back plate;
the light source device is arranged on the back plate, and a light outlet of the light source device is aligned to the light inlet side;
the limiting structure is arranged at the top of the light source device and provided with a first end and a second end which are opposite, the first end is fixed at the top, and the second end extends to the upper part of the light guide plate and is propped against the light guide plate; and
and the first reflector plate is arranged between the light guide plate and the back plate.
2. The side-entry backlight module of claim 1, wherein the position-limiting structure is made of a transparent material or a ceramic material.
3. The side-entry backlight module of claim 1, wherein the material of the position-limiting structure comprises polycarbonate or polymethyl methacrylate.
4. The side-entry backlight module of claim 1, wherein the second end has a wedge-shaped guide surface facing the light guide plate.
5. The side-entry backlight module of claim 1, wherein the light exit of the light source device is closely attached to the light entry side.
6. The side-entry backlight module of claim 1, wherein the thickness of the position-limiting structure gradually increases from the first end to the second end.
7. The side-entry backlight module of claim 1, wherein the thickness of the position-limiting structure increases in a stepwise manner from the first end toward the second end.
8. The side-entry backlight module of claim 5, wherein the second end comprises a limiting bump contacting the light guide plate.
9. The side-entry backlight module of claim 1, wherein the surface of the light entry side has light scattering structures.
10. The side-entry backlight module of claim 1, further comprising a plurality of reflective dots disposed on the bottom of the light guide plate and between the light guide plate and the first reflective sheet.
11. The side-entry backlight module of claim 1, further comprising a highly reflective coating on the bottom of the position-limiting structures and between the position-limiting structures and the light source device.
12. The side-entry backlight module of claim 1, further comprising a second reflector plate disposed above the position-limiting structure, wherein an end of the second reflector plate extends above the light guide plate, and the second reflector plate has a plurality of arc-shaped reflective structures above the light guide plate.
13. The side-entry backlight module of claim 12, wherein the arc of each of the arc-shaped reflective structures is greater closer to the light source device.
14. The side-entry backlight module of claim 12, wherein the second reflector further comprises a coating of scattering particles on the plurality of arc-shaped reflective structures.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211016580.4A CN115373065A (en) | 2022-08-24 | 2022-08-24 | Side light-entering type backlight module |
| TW111132489A TWI818696B (en) | 2022-08-24 | 2022-08-29 | Edge-type backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211016580.4A CN115373065A (en) | 2022-08-24 | 2022-08-24 | Side light-entering type backlight module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115373065A true CN115373065A (en) | 2022-11-22 |
Family
ID=84068612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211016580.4A Pending CN115373065A (en) | 2022-08-24 | 2022-08-24 | Side light-entering type backlight module |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115373065A (en) |
| TW (1) | TWI818696B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM373503U (en) * | 2009-03-06 | 2010-02-01 | Chunghwa Picture Tubes Ltd | Backlight module |
| CN204141394U (en) * | 2014-09-28 | 2015-02-04 | 北京京东方茶谷电子有限公司 | Backlight module and display unit |
| CN204285106U (en) * | 2014-10-20 | 2015-04-22 | 深圳Tcl新技术有限公司 | Side injection type backlight module and display unit |
| CN106873240B (en) * | 2017-02-07 | 2020-05-19 | 深圳市华星光电技术有限公司 | Backlight assembly and liquid crystal display module |
| CN207148475U (en) * | 2017-09-25 | 2018-03-27 | 京东方科技集团股份有限公司 | Display module and display device |
| CN108761900B (en) * | 2018-04-28 | 2021-06-29 | 厦门天马微电子有限公司 | Backlight module, display panel and display device |
-
2022
- 2022-08-24 CN CN202211016580.4A patent/CN115373065A/en active Pending
- 2022-08-29 TW TW111132489A patent/TWI818696B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| TWI818696B (en) | 2023-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4436105B2 (en) | Reflector, illumination device, light guide plate, and display device | |
| KR100399085B1 (en) | Surface light source device of side light type | |
| KR100501066B1 (en) | Surface light source device of side light type | |
| US7303324B2 (en) | Backlight module | |
| US8212962B2 (en) | Optical device, material for forming optical device, backlight for display, display and method of making device or material | |
| US7334934B2 (en) | Light guide device and a backlight module using the same | |
| US20090323372A1 (en) | Device and display device using the same | |
| JP2006294361A (en) | Light guide plate and display device | |
| JPH1164642A (en) | Side light type surface light source device | |
| JP3994190B2 (en) | Backlight | |
| US20150192724A1 (en) | Area light source device and display device using same | |
| JP6316494B1 (en) | Surface light source device and display device | |
| JP2009135116A (en) | Planar light source device, prism sheet, display, and information processor | |
| JP5700084B2 (en) | Light guide plate, surface light source device, transmissive display device | |
| JP3805527B2 (en) | Sidelight type surface light source device, liquid crystal display device, and light guide plate | |
| JP3351251B2 (en) | Sidelight type surface light source device | |
| CN115373065A (en) | Side light-entering type backlight module | |
| JP2004070169A (en) | Light guide plate and back light apparatus using the same | |
| TW202409674A (en) | Edge-type backlight module | |
| JPH11345513A (en) | Backlight device | |
| JP2000214460A (en) | Back light device | |
| CN1504776A (en) | Light conducting element | |
| JPH11109351A (en) | Side light type surface light source device | |
| CN114755752B (en) | Backlight module | |
| JP3359814B2 (en) | Light guide plate and side light type surface light source device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |