CN106959554B - Reflective astigmatic lens, backlight module and liquid crystal display device - Google Patents
Reflective astigmatic lens, backlight module and liquid crystal display device Download PDFInfo
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- CN106959554B CN106959554B CN201710315752.0A CN201710315752A CN106959554B CN 106959554 B CN106959554 B CN 106959554B CN 201710315752 A CN201710315752 A CN 201710315752A CN 106959554 B CN106959554 B CN 106959554B
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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
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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
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The embodiment of the utility model discloses a reflective astigmatic lens, a backlight module and a liquid crystal display device, wherein the reflective astigmatic lens comprises a first reflecting surface arranged on the upper surface, a first refracting surface arranged on the bottom surface, and a second refracting surface and a third refracting surface arranged on the side surface, wherein the second refracting surface is arranged above the third refracting surface and is connected with the third refracting surface, and the second refracting surface and the third refracting surface form the side surface of the reflective astigmatic lens. The first reflecting surface, the first refracting surface, the second refracting surface and the third refracting surface are all curved surfaces, and the light mixing distance of the LED backlight module is further reduced by the optical effect of the curved surfaces of the reflective light-diffusing lens, so that the thickness of the backlight module is reduced, and the thickness of the direct type liquid crystal display device can be further reduced.
Description
Technical Field
The embodiment of the utility model relates to the technical field of liquid crystal display backlight modules, in particular to a reflective astigmatic lens, a backlight module and a liquid crystal display device.
Background
The liquid crystal display device (LCD, liquidCrystalDisplay) has many advantages such as light weight, thin body, and power saving, and thus has been widely used. The backlight source of the traditional liquid crystal display device adopts a cold cathode ray tube (CCFL), and the current LED light source becomes a novel backlight source for replacing the cold cathode ray tube (CCFL) due to the advantages of uniform distribution of luminous bodies, longer service life, better environmental protection and the like.
The LED backlight source used in the liquid crystal display device has two types of direct type and side-in type, and the side-in type LED backlight source has the advantage of thin size, but has lower light utilization rate and relatively low uniformity. The direct type LED backlight source has the advantages of uniform light emission, high gray level, high light utilization rate, simple structure and the like, and is widely used in the current liquid crystal display device.
At present, the ultra-thinning is a development trend of a liquid crystal display device, and in the research process, it is found that in the current direct type LED backlight source, the light mixing distance needs to be further reduced for realizing the ultra-thinning, and the adopted scheme is that a refractive lens is arranged on each LED backlight source, and the light mixing distance is reduced by utilizing the refractive principle of the lens. However, due to the limitation of the principle, the light mixing distance cannot be further reduced, and the thickness of the backlight module cannot be further reduced.
Disclosure of Invention
In view of the above problems, embodiments of the present utility model provide a reflective astigmatic lens structure and a liquid crystal display device, which solve the defects of the refractive lens in the prior art, further reduce the light mixing distance of the backlight source, further reduce the thickness of the backlight source, and further reduce the thickness of the liquid crystal display device.
According to an aspect of an embodiment of the present utility model, there is provided a reflective astigmatic lens having an axisymmetric structure with respect to a normal line of a lens center, including:
the first reflecting surface is arranged on the upper surface of the lens and is funnel-shaped;
a first refraction surface arranged on the bottom surface of the lens;
a second refractive surface and a third refractive surface provided on the lens side surface; the second refraction surface is arranged above the third refraction surface and connected with the third refraction surface, and the second refraction surface and the third refraction surface form the side surface of the reflective astigmatic lens;
the first reflecting surface, the first refracting surface, the second refracting surface and the third refracting surface are all curved surfaces and are all axisymmetric along the center normal line of the lens; the curvature of a spline curve formed by the curved surfaces can be defined by taking a longitudinal section as a reference and longitudinal coordinates and transverse coordinates with the longitudinal direction parallel to the normal direction of the center of the lens as a longitudinal direction and the transverse direction perpendicular to the longitudinal direction;
wherein the spline curve of the first reflecting surface has a lateral coordinate between-0.02 and 0.02, preferably 0, when the spline curve has a longitudinal coordinate of 0; when the longitudinal coordinate is 0.5, the transverse coordinate is between 0.46 and 0.56, preferably 0.51; when the longitudinal coordinate is 1, the transverse coordinate is between 1 and 1.1, preferably 1.05; when the longitudinal coordinate is 1.5, the transverse coordinate is between 1.58 and 1.68, preferably 1.63; when the longitudinal coordinate is 2, the transverse coordinate is between 2.19 and 2.29, preferably 2.24; when the longitudinal coordinate is 2.5, the transverse coordinate is between 2.86 and 2.96, preferably 2.91; when the longitudinal coordinate is 3, the transverse coordinate is between 3.57 and 3.67, preferably 3.62; when the longitudinal coordinate is 3.5, the transverse coordinate is between 4.35 and 4.45, preferably 4.4; when the longitudinal coordinate is 4, the transverse coordinate is between 5.21 and 5.31, preferably 5.26; when the longitudinal coordinate is 4.5, the transverse coordinate is between 6.16 and 6.26, preferably 6.21; when the longitudinal coordinate is 5, the transverse coordinate is between 7.1 and 7.2, preferably 7.15.
Wherein the spline of the first refractive surface has a lateral coordinate between-0.02 and 0.02, preferably 0, when the spline has a longitudinal coordinate of 0; when the longitudinal coordinate is 0.2, the transverse coordinate is between-0.41 and-0.31, preferably-0.36; when the longitudinal coordinate is 0.4, the transverse coordinate is between-1.11 and-1.01, preferably-1.06; when the longitudinal coordinate is again 0.4, the transverse coordinate is between-1.77 and-1.67, preferably-1.72.
Wherein the spline of the second refractive surface has a lateral coordinate between-0.02 and 0.02, preferably 0, when the spline has a longitudinal coordinate of 0; when the longitudinal coordinate is 0.5, the transverse coordinate is between-0.01 and 0.09, preferably 0.04; when the longitudinal coordinate is 1, the transverse coordinate is between 0.03 and 0.13, preferably 0.08; when the longitudinal coordinate is 1.5, the transverse coordinate is between 0.08 and 0.18, preferably 0.13; when the longitudinal coordinate is 2, the transverse coordinate is between 0.12 and 0.22, preferably 0.17; when the longitudinal coordinate is 2.5, the transverse coordinate is between 0.15 and 0.25, preferably 0.2; when the longitudinal coordinate is 3, the transverse coordinate is between 0.2 and 0.3, preferably 0.25; when the longitudinal coordinate is 3.5, the transverse coordinate is between 0.24 and 0.34, preferably 0.29.
Wherein the spline curve of the third refractive surface has a lateral coordinate between-0.02 and 0, 02, preferably 0, when the spline curve has a longitudinal coordinate of 0; when the longitudinal coordinate is 0.5, the transverse coordinate is between 0.31 and 0.41, preferably 0.36; when the longitudinal coordinate is 1, the transverse coordinate is between 0.64 and 0.74, preferably 0.69; when the longitudinal coordinate is 1.5, the transverse coordinate is between 0.86 and 0.96, preferably 0.91; when the longitudinal coordinate is 2, the transverse coordinate is between 0.99 and 1.09, preferably 1.04; when the longitudinal coordinate is 2.5, the transverse coordinate is between 1.03 and 1.13, preferably 1.08.
The coordinates are in millimeters (mm).
Optionally, a limiting space is arranged below the first refraction surface and used for limiting the installation position of the LED lamp bead and the reflective diffusion lens, and a certain distance is formed between the top surface of the LED lamp bead and the reflective diffusion lens, and the distance is preferably 0.10mm.
Optionally, the material of the reflective astigmatic lens is acrylic (PMMA).
According to the reflective light-diffusing lens provided by the embodiment of the utility model, the first reflecting surface, the first refracting surface, the second refracting surface and the third refracting surface are all curved surfaces, and the light mixing distance of the LED backlight module is further reduced by the optical effect of the curved surfaces of the reflective light-diffusing lens, so that the thickness of the backlight module is reduced, and the thickness of the direct type liquid crystal display device is further reduced.
Another embodiment of the present utility model provides a backlight module, which includes:
the back plate is provided with a back plate,
the LED light source array is arranged on the back plate;
the diffusion sheet is arranged above the LED light source array;
an optical film disposed on the diffusion sheet;
the liquid crystal panel is arranged on the optical film;
wherein the reflective astigmatic lens of any one of the above is provided on each LED bead of the LED light source array.
According to the backlight module provided by the embodiment of the utility model, the LED backlight source adopts the reflective astigmatic lens, so that the light mixing distance of the backlight module is reduced, the distance of the backlight module is further reduced, and the backlight module is beneficial to lightening and thinning of a liquid crystal display device.
The third embodiment of the utility model provides a liquid crystal display device, which comprises the backlight module.
In the liquid crystal display device provided by the third embodiment of the utility model, the reflective diffusion lens is adopted in the LED backlight source of the backlight module, so that the light mixing distance of the backlight module is reduced, the distance of the backlight module is further reduced, and the liquid crystal display device is beneficial to lightening and thinning.
The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a schematic view showing a structure of a direct type liquid crystal display device in the prior art;
FIG. 2 is a schematic diagram showing the light mixing distance of a direct type liquid crystal display device according to the prior art;
FIG. 3 is a schematic diagram of a refractive lens used in a direct-in LED light source of the prior art;
fig. 4 shows a schematic structural diagram of a reflective diffusion lens used in an LED backlight according to a first embodiment of the present utility model;
fig. 5 shows a schematic structural diagram of a backlight module according to a second embodiment of the utility model.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to facilitate understanding of the advantages of the present utility model, a schematic structure of a direct type liquid crystal display device in the prior art will be briefly described. As shown in fig. 1, the liquid crystal module 100 includes a back plate 101, a reflective sheet 102, an LED chip array 103 composed of a plurality of LED lamps, a diffusion sheet 104, an optical film 105, and a liquid crystal panel 106. The light source LED chip array 103 is disposed at the bottom of the backlight source, and after light is emitted from the LEDs, the light is diffused by the diffusion sheet 104 on the surface and then uniformly emitted by the optical film 105, and the reflection sheet 102 is used for reflecting the light emitted by the LED lamp, so that the light utilization rate is maximized. The thickness of the backlight of the lcd device is mainly determined by the cavity height between the back plate 101 and the diffusion plate 104, and theoretically, the larger the cavity height, the better the uniformity of light emitted from the diffusion plate on the premise of meeting the installation requirement and the light emitting brightness.
In the direct-type liquid crystal display device of fig. 1, the LED light-emitting lamp beads used in the backlight module are of a disposable optical design, the light rays of the lenses on the surfaces of the lamp beads are distributed within a solid angle of ±60°, and the radiation angle generally accords with the lambertian distribution of 120 °. In the prior art, firstly, energy conservation and consumption of the backlight are considered, a large number of LED lamp beads cannot be used, because too many LEDs cause too high brightness, a large amount of luminous flux is wasted, the cost is very high, and therefore, the number of the LED lamp beads is reduced as much as possible. However, if the number of the LED beads is reduced, moire phenomenon (Mura) is easily generated, which is a more important problem. In order to eliminate moire, a proposal is generally adopted to increase the light mixing distance, i.e. the distance between the LED and the diffusion plate, but this necessarily results in an increase in the thickness of the direct type backlight module.
However, the trend of the liquid crystal display device is to further reduce the thickness of the liquid crystal display device, and first, the thickness of the backlight is to be reduced, and it is impossible to set the cavity height in fig. 1 to be large. But reducing the thickness of the cavity will reduce the light mixing distance of the module, which will affect the uniformity of the light. As shown in fig. 2, the light mixing distance H of the backlight module is indicated. Therefore, in the prior art, a technical scheme of a refractive lens is adopted, and the refractive lens is used for refracting light rays emitted by the LED light source to ensure uniformity of the light rays.
Fig. 3 is a schematic diagram of a refractive lens structure used for an LED light source in the prior art. As shown in fig. 3, a refractive lens 107 is disposed over each LED bead, and the secondary optical design is performed on the LED through the refractive lens 107. With the above lens structure, when light emitted from the LED enters from the bottom surface of the lens, a large amount of light is incident on the surface of the first concave portion, and the light is refracted first when passing through the surface of the concave portion, and then is refracted again when exiting from the upper surface of the lens. Through twice refraction, the light emitted by the LEDs is greatly diffused, so that a plurality of LED light source devices can generate good light mixing effect only by a small distance, and the thickness of the backlight module is reduced.
However, it was found in the research process that the thickness of the backlight module can be properly reduced by using the refractive lens of fig. 3, but based on the refractive principle, the thickness of the backlight module cannot be further reduced by further reducing the light mixing distance. Therefore, the first embodiment of the present utility model provides a reflective light-diffusing lens, which can further reduce the light-mixing distance, thereby further reducing the thickness of the backlight module.
Fig. 4 is a schematic structural diagram of a reflective astigmatic lens according to a first embodiment of the present utility model. The reflective diffusing lens 207 is disposed over the LED beads and has a first reflective surface 2071, a first refractive surface 2072, a second refractive surface 2073 and a third refractive surface 2074. The position of the LED beads coincides with the lens center of the lens 207. The LED chip array takes the form of a light bar, and the reflective diffusing lens 207 is disposed over each light bead. Wherein a limiting space is provided below the first refractive surface 2071 for limiting the mounting position of the LED lamp beads and the reflective diffusion lens 207, and the top surface of the LED lamp beads is spaced from the reflective diffusion lens 207 by a certain distance, preferably 0.10mm. Mounting feet are provided on the bottom surface of the reflective diffusing lens 207 for mounting the reflective diffusing lens 207 on the bottom plate of the LED array. The material of the lens 207 is a lens material commonly used in the art, preferably acrylic (PMMA).
Fig. 4 is a longitudinal sectional view of the reflection lens 207, wherein the center line is a normal line, and the longitudinal direction is a direction parallel to the center normal line. The reflective astigmatic lens 207 has an axisymmetric structure with respect to the normal line of the center of the lens, and the reflective astigmatic lens 207 is provided with a funnel-shaped cavity 208 at the top thereof, and the surface of the funnel-shaped cavity 208 forms a reflective surface to constitute a first reflective surface 2071 of the lens 207, i.e., the first reflective surface 2071 is a funnel-shaped reflective surface formed symmetrically with respect to the normal line. The reflection surface may be formed by any method known in the art, for example, by coating a reflective material or attaching a reflective film, and the like, and is not limited thereto.
The reflective lens 207 includes a first refractive surface 2072 provided at the bottom of the reflective lens 207 in addition to a funnel-shaped first reflective surface 2071 provided at the top. The first refractive surface 2072 is disposed above the apex of the LED lamp beads and is spaced apart by a distance, preferably 0.10mm.
In addition, the reflection type lens 207 further includes a second refraction surface 2072 and a third refraction surface 2073 provided at side surfaces thereof, except for top and bottom surfaces. Wherein the second refractive surface 2072 is disposed above the third refractive surface 2073 along the side surface of the reflective lens 207 and is connected to the third refractive surface 2073, the second refractive surface 2072 and the third refractive surface 2073 constitute the side surface of the reflective lens 207.
In use, light from the LED beads first enters the lens 207 by refraction from the first refractive surface 2072. The light refracted toward the side surface of the lens 207 is directly refracted to the outside of the lens through the second refractive surface 2073 or the third refractive surface 2074. The light refracted toward the upper surface of the lens is reflected by the first reflecting surface 2071, and then refracted to the outside of the lens through the second refracting surface 2073 or the third refracting surface 2074. Light refracted toward the bottom surface of the lens 207 or light reflected toward the bottom surface by the first reflecting surface 2071 is reflected back into the lens, and is reflected and refracted again by the optical path to be directed to the outside of the lens. The reflection may be performed by the reflection sheet 102 provided on the back plate 101, or a reflection layer provided at a position where the second refraction surface 2071 is removed from the bottom surface of the lens.
The lens 207 according to the first embodiment of the present utility model includes a first reflecting surface 2071, a first refraction 2072, a second refraction surface 2073, and a third refraction surface 2074, wherein the optical surfaces are curved surfaces having curvatures along a longitudinal direction and a transverse direction, respectively, and the longitudinal direction is a direction parallel to a normal line of a center of the lens and the transverse direction is a transverse direction perpendicular to the longitudinal direction as defined above. The curvature of the spline curve formed by the curved surface can be defined by longitudinal coordinates and transverse coordinates based on a longitudinal section along the normal line of the center of the lens, and the spline curve referred to in the present application is defined as a curve formed by longitudinal coordinates and transverse coordinates based on the longitudinal section.
Referring to table 1, for spline data of the first reflecting surface 2071, for better protection of the product, the spline coordinates have a range, and the range of products is within the scope of patent claims. Referring specifically to Table 1, the units are millimeters (mm). The spline has a longitudinal coordinate of 0 and a transverse coordinate of-0.02 to 0.02, preferably 0; when the longitudinal coordinate is 0.5, the transverse coordinate is between 0.46 and 0.56, preferably 0.51; when the longitudinal coordinate is 1, the transverse coordinate is between 1 and 1.1, preferably 1.05; when the longitudinal coordinate is 1.5, the transverse coordinate is between 1.58 and 1.68, preferably 1.63; when the longitudinal coordinate is 2, the transverse coordinate is between 2.19 and 2.29, preferably 2.24; when the longitudinal coordinate is 2.5, the transverse coordinate is between 2.86 and 2.96, preferably 2.91; when the longitudinal coordinate is 3, the transverse coordinate is between 3.57 and 3.67, preferably 3.62; when the longitudinal coordinate is 3.5, the transverse coordinate is between 4.35 and 4.45, preferably 4.4; when the longitudinal coordinate is 4, the transverse coordinate is between 5.21 and 5.31, preferably 5.26; when the longitudinal coordinate is 4.5, the transverse coordinate is between 6.16 and 6.26, preferably 6.21; when the longitudinal coordinate is 5, the transverse coordinate is between 7.1 and 7.2, preferably 7.15.
| Longitudinal coordinates | Transverse typical value | Transverse minimum value | Maximum in the |
| 0 | 0 | -0.02 | 0.02 |
| 0.5 | 0.51 | 0.46 | 0.56 |
| 1 | 1.05 | 1 | 1.1 |
| 1.5 | 1.63 | 1.58 | 1.68 |
| 2 | 2.24 | 2.19 | 2.29 |
| 2.5 | 2.91 | 2.86 | 2.96 |
| 3 | 3.62 | 3.57 | 3.67 |
| 3.5 | 4.4 | 4.35 | 4.45 |
| 4 | 5.26 | 5.21 | 5.31 |
| 4.5 | 6.21 | 6.16 | 6.26 |
| 5 | 7.15 | 7.1 | 7.2 |
TABLE 1
Referring to table 2, for spline curve data for the first refractive surface 2072, for better protection of the product, the spline curve coordinates have a range that is within the scope of the patent claims. Referring specifically to Table 2, the units are millimeters (mm). The spline has a longitudinal coordinate of 0 and a transverse coordinate of-0.02 to 0.02, preferably 0; when the longitudinal coordinate is 0.2, the transverse coordinate is between-0.41 and-0.31, preferably-0.36; when the longitudinal coordinate is 0.4, the transverse coordinate is between-1.11 and-1.01, preferably-1.06; when the longitudinal coordinate is again 0.4, the transverse coordinate is between-1.77 and-1.67, preferably-1.72.
| Longitudinal coordinates | Transverse typical value | Transverse minimum value | Maximum in the |
| 0 | 0 | -0.02 | 0.02 |
| 0.2 | -0.36 | -0.41 | -0.31 |
| 0.4 | -1.06 | -1.11 | -1.01 |
| 0.4 | -1.72 | -1.77 | -1.67 |
TABLE 2
Referring to table 3, for spline curve data for the second refractive surface 2073, for better protection of the product, the spline curve coordinates have a range that is within the scope of the patent claims. Referring specifically to Table 3, the units are millimeters (mm). The spline has a longitudinal coordinate of 0 and a transverse coordinate of-0.02 to 0.02, preferably 0; when the longitudinal coordinate is 0.5, the transverse coordinate is between-0.01 and 0.09, preferably 0.04; when the longitudinal coordinate is 1, the transverse coordinate is between 0.03 and 0.13, preferably 0.08; when the longitudinal coordinate is 1.5, the transverse coordinate is between 0.08 and 0.18, preferably 0.13; when the longitudinal coordinate is 2, the transverse coordinate is between 0.12 and 0.22, preferably 0.17; when the longitudinal coordinate is 2.5, the transverse coordinate is between 0.15 and 0.25, preferably 0.2; when the longitudinal coordinate is 3, the transverse coordinate is between 0.2 and 0.3, preferably 0.25; when the longitudinal coordinate is 3.5, the transverse coordinate is between 0.24 and 0.34, preferably 0.29.
| Longitudinal coordinates | Transverse typical value | Transverse minimum value | Maximum in the |
| 0 | 0 | -0.02 | 0.02 |
| 0.5 | 0.04 | -0.01 | 0.09 |
| 1 | 0.08 | 0.03 | 0.13 |
| 1.5 | 0.13 | 0.08 | 0.18 |
| 2 | 0.17 | 0.12 | 0.22 |
| 2.5 | 0.2 | 0.15 | 0.25 |
| 3 | 0.25 | 0.2 | 0.3 |
| 3.5 | 0.29 | 0.24 | 0.34 |
TABLE 3 Table 3
Referring to table 4, for the third refractive surface 2074 spline data, for better protection of the product, the spline coordinates have a range of products within the scope of the patent claims. Referring specifically to Table 4, the units are millimeters (mm). When the longitudinal coordinate of the spline curve is 0, the transverse coordinate is between-0.02 and 0, 02, preferably 0; when the longitudinal coordinate is 0.5, the transverse coordinate is between 0.31 and 0.41, preferably 0.36; when the longitudinal coordinate is 1, the transverse coordinate is between 0.64 and 0.74, preferably 0.69; when the longitudinal coordinate is 1.5, the transverse coordinate is between 0.86 and 0.96, preferably 0.91; when the longitudinal coordinate is 2, the transverse coordinate is between 0.99 and 1.09, preferably 1.04; when the longitudinal coordinate is 2.5, the transverse coordinate is between 1.03 and 1.13, preferably 1.08.
| Longitudinal coordinates | Transverse typical value | Transverse minimum value | Maximum in the |
| 0 | 0 | -0.02 | 0.02 |
| 0.5 | 0.36 | 0.31 | 0.41 |
| 1 | 0.69 | 0.64 | 0.74 |
| 1.5 | 0.91 | 0.86 | 0.96 |
| 2 | 1.04 | 0.99 | 1.09 |
| 2.5 | 1.08 | 1.03 | 1.13 |
TABLE 4 Table 4
Experiments show that the reflective astigmatic lens with the curved surface provided by the embodiment of the utility model can reduce the light mixing distance to 15mm, while the light mixing distance of the traditional refractive lens is 25mm, and is reduced by 10mm.
In one embodiment, the present utility model provides a reflective astigmatic lens structure, which includes a first reflective surface 2071 disposed on an upper surface, a first refractive surface 2072 disposed on a bottom surface, and a second refractive surface 2073 and a third refractive surface 2074 disposed on side surfaces. The reflective astigmatic lens 207 with the optical surface further reduces the light mixing distance of the backlight module, thereby further reducing the thickness of the backlight module and being beneficial to the light and thin of the liquid crystal display.
In a second embodiment of the present utility model, as shown in fig. 5, the backlight module includes a back plate 01, a reflective sheet 202, an LED chip array light source 203 composed of a plurality of LED lamps, a diffusion sheet 204, an optical film 205, a liquid crystal panel 206, and a reflective diffusion lens 207 disposed on each LED lamp bead. The structure of the reflective astigmatic lens 207 is the same as that of the reflective astigmatic lens 207 in the first embodiment of the present utility model, and will not be described here.
In the backlight module provided by the second embodiment of the utility model, the reflective astigmatic lens 207 is adopted, so that the light mixing distance of the backlight module is reduced, and the thickness is further reduced.
The third embodiment of the utility model provides a liquid crystal display device, which comprises a back plate, a reflecting sheet, an LED wafer array formed by a plurality of LED lamps, a diffusion sheet, an optical film, a liquid crystal panel and a reflecting type diffusion lens arranged on each LED lamp bead. The structure of the reflective astigmatic lens is the same as that of the reflective astigmatic lens 207 in the first embodiment of the present utility model, and will not be described here.
It should be noted that, the liquid crystal module provided in the embodiment of the present utility model includes at least a circuit board and other optical components besides the above-mentioned structure, and the utility model is not limited to the other components of the liquid crystal module in the embodiment of the present utility model, and those skilled in the art can refer to the specific structure and the modified structure of the liquid crystal module in the prior art.
Based on the above proposed liquid crystal display device, such as a display, a liquid crystal television, and the like, the liquid crystal display device uses the backlight module including the reflective astigmatic lens, so that the overall thickness of the liquid crystal display device can be further reduced due to the use of the above proposed borderless liquid crystal module, thereby improving the overall appearance effect of the displayed device and improving the product quality.
It should be noted that the above description is not intended to limit the utility model, but rather the utility model is not limited to the above examples, and that variations, modifications, additions or substitutions within the spirit and scope of the utility model will be within the scope of the utility model.
Claims (10)
1. A reflective astigmatic lens having an axisymmetric configuration with respect to a center normal of the lens, comprising:
the first reflecting surface is arranged on the upper surface of the lens and is funnel-shaped;
a first refraction surface arranged on the bottom surface of the lens;
a second refractive surface and a third refractive surface provided on the lens side surface; the second refraction surface is arranged above the third refraction surface and is connected with the third refraction surface, and the second refraction surface and the third refraction surface form the side surface of the reflective astigmatic lens;
the first reflecting surface, the first refracting surface, the second refracting surface and the third refracting surface are all curved surfaces and are all axisymmetric along the center normal line of the lens; the curvature of a spline curve formed by the curved surfaces can be defined by taking a longitudinal section as a reference and longitudinal coordinates and transverse coordinates with the longitudinal direction parallel to the normal direction of the center of the lens as a longitudinal direction and the transverse direction perpendicular to the longitudinal direction;
wherein, the spline curve of the first reflecting surface has a transverse coordinate between-0.02 and 0.02 when the longitudinal coordinate of the spline curve is 0; when the longitudinal coordinate is 0.5, the transverse coordinate is between 0.46 and 0.56; when the longitudinal coordinate is 1, the transverse coordinate is between 1 and 1.1; when the longitudinal coordinate is 1.5, the transverse coordinate is between 1.58 and 1.68; when the longitudinal coordinate is 2, the transverse coordinate is between 2.19 and 2.29; when the longitudinal coordinate is 2.5, the transverse coordinate is between 2.86 and 2.96; when the longitudinal coordinate is 3, the transverse coordinate is between 3.57 and 3.67; when the longitudinal coordinate is 3.5, the transverse coordinate is between 4.35 and 4.45; when the longitudinal coordinate is 4, the transverse coordinate is between 5.21 and 5.31; when the longitudinal coordinate is 4.5, the transverse coordinate is between 6.16 and 6.26; when the longitudinal coordinate is 5, the transverse coordinate is between 7.1 and 7.2;
wherein the spline of the first refractive surface has a lateral coordinate between-0.02 and 0.02 when the longitudinal coordinate of the spline is 0; when the longitudinal coordinate is 0.2, the transverse coordinate is between-0.41 and-0.31; when the longitudinal coordinate is 0.4, the transverse coordinate is between-1.11 and-1.01; when the longitudinal coordinate is again 0.4, the transverse coordinate is between-1.77 and-1.67;
wherein the spline of the second refractive surface has a lateral coordinate between-0.02 and 0.02 when the longitudinal coordinate of the spline is 0; when the longitudinal coordinate is 0.5, the transverse coordinate is between-0.01 and 0.09; when the longitudinal coordinate is 1, the transverse coordinate is between 0.03 and 0.13; when the longitudinal coordinate is 1.5, the transverse coordinate is between 0.08 and 0.18; when the longitudinal coordinate is 2, the transverse coordinate is between 0.12 and 0.22; when the longitudinal coordinate is 2.5, the transverse coordinate is between 0.15 and 0.25; when the longitudinal coordinate is 3, the transverse coordinate is between 0.2 and 0.3; when the longitudinal coordinate is 3.5, the transverse coordinate is between 0.24 and 0.34;
wherein, the spline curve of the third refractive surface has a transverse coordinate between-0.02 and 0, 02 when the longitudinal coordinate of the spline curve is 0; when the longitudinal coordinate is 0.5, the transverse coordinate is between 0.31 and 0.41; when the longitudinal coordinate is 1, the transverse coordinate is between 0.64 and 0.74; when the longitudinal coordinate is 1.5, the transverse coordinate is between 0.86 and 0.96; when the longitudinal coordinate is 2, the transverse coordinate is between 0.99 and 1.09; when the longitudinal coordinate is 2.5, the transverse coordinate is between 1.03 and 1.13;
the coordinates are in millimeters.
2. The reflective astigmatic lens of claim 1, wherein the spline of the first reflective surface has a lateral coordinate of 0 when the spline has a longitudinal coordinate of 0; when the longitudinal coordinate of the spline curve is 0.5, the transverse coordinate is 0.51; when the longitudinal coordinate is 1, the transverse coordinate is 1.05; when the longitudinal coordinate is 1.5, the transverse coordinate is 1.63; when the longitudinal coordinate is 2, the transverse coordinate is 2.24; when the longitudinal coordinate is 2.5, the transverse coordinate is 2.91; when the longitudinal coordinate is 3, the transverse coordinate is 3.62; when the longitudinal coordinate is 3.5, the transverse coordinate is 4.4; when the longitudinal coordinate is 4, the transverse coordinate is 5.26; when the longitudinal coordinate is 4.5, the transverse coordinate is 6.21; when the longitudinal coordinate is 5, the transverse coordinate is 7.15.
3. The reflective astigmatic lens of claim 2, wherein the spline of the first refractive surface has a lateral coordinate 0 when the spline has a longitudinal coordinate of 0; when the longitudinal coordinate is 0.2, the transverse coordinate is-0.36; when the longitudinal coordinate is 0.4, the transverse coordinate is-1.06; when the longitudinal coordinate is again 0.4, the transverse coordinate is-1.72.
4. A reflective astigmatic lens according to claim 3, wherein the spline of the second refractive surface has a transverse coordinate of 0 when the spline has a longitudinal coordinate of 0; when the longitudinal coordinate is 0.5, the transverse coordinate is 0.04; when the longitudinal coordinate is 1, the transverse coordinate is 0.08; when the longitudinal coordinate is 1.5, the transverse coordinate is 0.13; when the longitudinal coordinate is 2, the transverse coordinate is 0.17; when the longitudinal coordinate is 2.5, the transverse coordinate is 0.2; when the longitudinal coordinate is 3, the transverse coordinate is 0.25; when the longitudinal coordinate is 3.5, the transverse coordinate is 0.29.
5. The reflective astigmatic lens of claim 4, wherein the spline of the third refractive surface has a lateral coordinate of 0 when the spline has a longitudinal coordinate of 0; when the longitudinal coordinate is 0.5, the transverse coordinate is 0.36; when the longitudinal coordinate is 1, the transverse coordinate is 0.69; when the longitudinal coordinate is 1.5, the transverse coordinate is 0.91; when the longitudinal coordinate is 2, the transverse coordinate is 1.04; when the longitudinal coordinate is 2.5, the transverse coordinate is 1.08.
6. The reflective diffusing lens of claim 1, wherein a spacing space is provided below the first refractive surface for defining a mounting position of the LED lamp bead and the reflective diffusing lens, and a top surface of the LED lamp bead is spaced from the reflective diffusing lens.
7. The reflective astigmatic lens of claim 6 wherein the distance is 0.10mm.
8. The reflective astigmatic lens of claim 1 wherein the material of the reflective astigmatic lens is acrylic.
9. A backlight module, comprising:
the back plate is provided with a back plate,
the LED light source array is arranged on the back plate;
the diffusion sheet is arranged above the LED light source array;
an optical film disposed on the diffusion sheet;
the liquid crystal panel is arranged on the optical film;
wherein, on each LED lamp bead of the LED light source array, the reflective astigmatic lens of any one of claims 1 to 8 is provided.
10. A liquid crystal display device comprising the backlight module of claim 9.
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| CN201710315752.0A CN106959554B (en) | 2017-05-08 | 2017-05-08 | Reflective astigmatic lens, backlight module and liquid crystal display device |
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| KR102330015B1 (en) | 2017-07-21 | 2021-11-22 | 엘지디스플레이 주식회사 | Lens, light source device, back light unit and electronic device |
| CN108873120B (en) * | 2018-07-13 | 2023-10-27 | 安徽芯瑞达科技股份有限公司 | Reflective lens for backlight module |
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| KR20060028576A (en) * | 2004-09-25 | 2006-03-30 | 삼성전자주식회사 | Side emitting device, back light unit using the same as a light source and liquid display apparatus employing it |
| CN203686878U (en) * | 2013-12-23 | 2014-07-02 | 东莞市欧科光电科技有限公司 | Novel LED backlight lens and liquid crystal display backlight screen |
| CN103994396A (en) * | 2014-05-14 | 2014-08-20 | 郑睿韬 | LED secondary refraction and reflection lens for direct lighting type backlight source |
| CN207502863U (en) * | 2017-05-08 | 2018-06-15 | 胜蓝科技股份有限公司 | A kind of reflective astigmat, backlight module and liquid crystal display device |
| CN114815011A (en) * | 2022-05-27 | 2022-07-29 | 合肥工业大学 | Optical lens, optical lens design method and application thereof |
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| KR20060028576A (en) * | 2004-09-25 | 2006-03-30 | 삼성전자주식회사 | Side emitting device, back light unit using the same as a light source and liquid display apparatus employing it |
| CN203686878U (en) * | 2013-12-23 | 2014-07-02 | 东莞市欧科光电科技有限公司 | Novel LED backlight lens and liquid crystal display backlight screen |
| CN103994396A (en) * | 2014-05-14 | 2014-08-20 | 郑睿韬 | LED secondary refraction and reflection lens for direct lighting type backlight source |
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