CN109031788A - A kind of backlight module and display device - Google Patents
A kind of backlight module and display device Download PDFInfo
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- CN109031788A CN109031788A CN201811014698.7A CN201811014698A CN109031788A CN 109031788 A CN109031788 A CN 109031788A CN 201811014698 A CN201811014698 A CN 201811014698A CN 109031788 A CN109031788 A CN 109031788A
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Classifications
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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
- 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
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—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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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a kind of backlight module and display devices, it include: multiple point light sources that array distribution is presented, and the light guide plate positioned at each point light source light output surface, the reflective layer of one side surface of point light source is deviated from positioned at light guide plate, and deviate from the diffusing reflection layer of one side surface of reflective layer positioned at light guide plate；Reflective layer includes: multiple reflective sites for being dispersed in light guide plate surface；Reflective site, for the light from light guide plate to be reflected back inside light guide plate；Diffusing reflection layer, for will the light from light guide plate to light guide plate diffusing reflection.Point light source is set to the lower surface of light guide plate by the present invention, the quantity of the point light source of setting can be greatly improved, thus it can both make the thickness of backlight module suitable with the thickness of the backlight module of side entering type, the quantity in backlight module light modulation region can be increased again, to meet the use demand of local dimming display system, the effect of local dimming is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
With the development of display technology, liquid crystal display technology is widely used in the display field. The lcd panel itself cannot emit light, and the backlight module is required to provide the required brightness for displaying. Due to the limitation of the characteristics of the liquid crystal panel, light leakage occurs to different degrees, and the improvement of the contrast ratio has a bottleneck.
Therefore, a scheme for performing local dimming (local dimming) on the backlight module is provided, and backlights in different areas can be independently controlled, so that when the backlight brightness corresponding to a high-brightness part in a displayed image can be maximized, and the backlight brightness corresponding to a dark part in the image can be reduced, so that the displayed image can achieve better contrast.
The ULED picture engine technology adopting multi-partition independent backlight control has the advantages of high picture brightness, high picture contrast, rich picture layering, excellent dark field details and the like, and is attracting more and more attention. However, it is a major challenge to achieve high dynamic contrast and high image quality display for ULED multi-segmented area Dimming (LD) while reducing the device shape. At present, a display device adopting a direct type backlight module can realize ultra-multi-partition regional dimming control, but the minimum light mixing distance of the direct type backlight module can only achieve 15 mm. The side-in backlight module can realize ultrathin design, the total thickness of the display device can be 9mm, the thickness of the backlight module can be 7.6mm, but the number of the partitions of the side-in backlight module is only 32 at most, and the dimming control and the image quality debugging of ULED cannot achieve the optimal effect at all.
Disclosure of Invention
The invention provides a backlight module and a display device, which can realize the partition of hundreds and thousands of grades of backlight while reducing the overall thickness of the backlight and improve the local dimming effect of the display device.
In a first aspect, the present invention provides a backlight module, including: the light source module comprises a plurality of point light sources which are distributed in an array mode, a light guide plate, a reflecting layer and a diffuse reflecting layer, wherein the light guide plate is positioned on the light emitting surface of each point light source;
the light reflecting layer includes: a plurality of reflective dots dispersed on the surface of the light guide plate;
the reflective mesh points are used for reflecting the light rays from the light guide plate back to the inside of the light guide plate;
the diffuse reflection layer is used for diffusely reflecting the light rays from the light guide plate to the light guide plate.
In a possible implementation manner, in the backlight module provided by the present invention, the light reflecting layer includes: the metal reflection layer, the reflection powder layer and the bonding layer; the light guide plate is provided with a point light source, the light guide plate is provided with a light reflection layer, the light reflection layer is arranged on one side, deviating from the point light source, of the light guide plate, the metal reflection layer is arranged on one side, deviating from the light guide plate, of the light reflection layer, and the bonding layer is arranged between the light reflection layer and the light guide plate.
In a possible implementation manner, in the backlight module provided by the present invention, the diffuse reflection layer includes a plurality of scattered diffuse reflection dots.
In a possible implementation manner, in the backlight module provided by the present invention, in an area covered by the emergent light of one of the point light sources, the dispersion density of the reflective dots decreases with an increase in distance from the point light source.
In a possible implementation manner, in the backlight module provided by the present invention, the aperture of the reflective dot satisfies the following relationship:
wherein Φ HR represents an aperture of the reflective dot, Φ LED represents a light exit aperture of the light source, L represents a thickness of the light guide plate, θ represents a light exit angle of the point light source, and K represents a reflection coefficient.
In a possible implementation manner, in the backlight module provided by the present invention, a distance between two adjacent reflective dots satisfies the following relationship:
wherein Pitch represents a distance between two adjacent reflective dots, Φ HR represents an aperture of the reflective dots, and L represents a thickness of the light guide plate.
In a possible implementation manner, in the backlight module provided by the invention, the material of the light reflecting powder layer is glass beads.
In a possible implementation manner, in the backlight module provided by the present invention, the point light source is a blue light emitting diode; the backlight module further comprises: and the quantum dot layer is positioned on one side of the light reflecting layer, which is far away from the light guide plate.
In a possible implementation manner, in the backlight module provided by the present invention, the backlight module further includes: the diffusion layer is positioned on one side, away from the light guide plate, of the light reflecting layer, and the optical film is positioned on one side, away from the light reflecting layer, of the diffusion layer.
In a second aspect, the present invention provides a display device, including any one of the above backlight modules and a display panel located at a light exit side of the backlight module.
The invention has the following beneficial effects:
the invention provides a backlight module and a display device, comprising: the light source module comprises a plurality of point light sources in array distribution, a light guide plate positioned on the light emitting surface of each point light source, a reflecting layer positioned on the surface of one side of the light guide plate, which is far away from the point light sources, and a diffuse reflection layer positioned on the surface of one side of the light guide plate, which is far away from the reflecting layer; wherein, the reflector layer includes: a plurality of reflective dots dispersed on the surface of the light guide plate; the light reflecting dots are used for reflecting the light rays from the light guide plate back to the inside of the light guide plate; and a diffuse reflection layer for diffusely reflecting the light from the light guide plate toward the light guide plate. The invention arranges the point light source on the lower surface of the light guide plate, and the emergent light of the point light source is converted into the surface light source emergent light of the light guide plate by the light guide plate, the reflecting layer and the diffuse reflection layer on the surface of the light guide plate. Therefore, the number of the point light sources can be greatly increased, the thickness of the backlight module is equivalent to that of a side-in backlight module, the number of the partitions of the backlight module can be increased, the use requirement of a regional dimming display system is met, and the regional dimming effect is improved.
Drawings
Fig. 1 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention;
fig. 2 is a schematic top view of a light-reflecting layer according to an embodiment of the present invention;
FIG. 3 is a second schematic cross-sectional view illustrating a backlight module according to an embodiment of the present invention;
fig. 4 is a third schematic cross-sectional view illustrating a backlight module according to an embodiment of the invention;
FIG. 5 is a second schematic diagram illustrating a top view of a light-reflecting layer according to an embodiment of the present invention;
FIG. 6 is a polar diagram of the radiation of an LED according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating relevant parameters of an LED according to an embodiment of the present invention;
FIG. 8 is a fourth schematic cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 9 is a fifth schematic cross-sectional view illustrating a backlight module according to an embodiment of the present invention;
fig. 10 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a backlight module and a display device, which can realize the partition of hundreds and thousands of grades of backlight while reducing the overall thickness of the backlight and improve the local dimming effect of the display device.
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The backlight module and the display device provided by the embodiments of the invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a backlight module provided in an embodiment of the present invention includes: the backlight module comprises a plurality of point light sources 11 which are distributed in an array mode, a light guide plate 12 which is arranged on the light emitting surface of each point light source 11, a reflecting layer 13 which is arranged on the surface, facing away from the point light sources 11, of the light guide plate 12, and a diffuse reflection layer 14 which is arranged on the surface, facing away from the reflecting layer 13, of the light guide plate 12. Wherein, the light reflecting layer 13 includes: a plurality of reflective dots x dispersed on the surface of the light guide plate 12; in the embodiment of the present invention, the reflective dots x are used for reflecting the light from the light guide plate 12 back to the inside of the light guide plate; and a diffuse reflection layer 14 for diffusely reflecting the light from the light guide plate 12 toward the light guide plate.
In the backlight module provided by the embodiment of the invention, each point light source 11 is located at the bottom of the light guide plate 12, and the light emitting surface of each point light source 11 is tightly attached to the lower surface of the light guide plate 12, so that the light emitted from the point light sources 11 can enter the light guide plate 12 as much as possible, a gap is prevented between the point light sources 11 and the light guide plate, excessive light is reflected by the bottom surface of the light guide plate and cannot enter the light guide plate, and the thickness of the backlight module can be further reduced by tightly attaching the bottom surface of the light guide plate to the light. Compared with the side-in type backlight module in the prior art, the light source module has the advantages that the point light sources are arranged on the lower surface of the light guide plate, the number of the arranged point light sources can be greatly increased, so that the thickness of the backlight module is equivalent to that of the side-in type backlight module, the number of dimming areas of the backlight module can be increased, the use requirement of an area dimming display system is met, and the area dimming effect is improved.
However, in practical applications, since the light emitted from the point light source 11 has a large light intensity at the center and a small light intensity at the edge, if only the point light source is directly emitted to the bottom surface of the light guide plate, the intensity of the light finally emitted from the light emitting surface of the light guide plate will be uneven, which is not favorable for image display. In order to form a light-emitting surface with uniform intensity on the light-emitting side of the light guide plate, in the embodiment of the invention, the light-emitting surface of the light guide plate is provided with the reflective layer 13, and the surface of the light guide plate on the side away from the reflective layer is provided with the diffuse reflection layer 14. The reflective layer 13 includes a plurality of reflective dots x, a small portion of light of the light guide plate can be emitted out through gaps between the reflective dots x, and most of the light can be incident on the reflective dots x, and the reflective dots x have a high reflectivity, so that the incident light can be reflected back into the light guide plate almost without loss, and further oscillated and reflected inside the light guide plate; the bottom surface of the light guide plate is provided with a diffuse reflection layer 14 which can diffuse the light reflected by the reflection layer 13 to the interior of the light guide plate, so that the reflected light is homogenized and enters the light emergent surface of the light guide plate again. The light rays in the light guide plate continuously pass through the reflection action, so that the intensity of the light rays finally emitted from the light emitting surface of the light guide plate is uniform, and the uniform light emitting surface is realized. The backlight module provided by the embodiment of the invention can be applied to a multi-partition regional dimming display system, wherein, as shown in fig. 1, each point light source 11 and the light guide plate region covered by the emergent light of the point light source can be used as an individual dimming region T, and the top view structure diagram of the dimming region T is shown in fig. 2. The brightness of the light emitted from the light-emitting surface of the light guide plate can be changed finally by controlling the brightness of the point light source 11 in each dimming area T, and the area dimming effect is achieved by independently controlling the brightness of different point light sources.
Specifically, as shown in fig. 3, the light reflecting layer 13 may include: a metal reflective layer 131, a light reflective powder layer 132, and an adhesive layer 133; the reflective powder layer 132 is located on a side of the light guide plate 12 away from the point light source 11, the metal reflective layer 131 is located on a side of the reflective powder layer 132 away from the light guide plate 12, and the adhesive layer 133 is located between the reflective powder layer 132 and the light guide plate 12.
The light guide plate 12 is made of amorphous inorganic non-metallic material, which is silicon dioxide or other oxides and is an amorphous solid plate with a random structure. The adhesive layer 133 is used for adhering the reflective powder layer 132 to the light emitting surface of the light guide plate 12. The reflective powder layer 132 is made of reflective powder, which is a glass bead material with a high refractive index, the refractive index of the reflective powder is 1.93, and the reflective powder layer has a retro-reflective characteristic, so that when light irradiates on reflective powder particles, the light is refracted and then gathered, reflected from a focus and refracted by the reflective powder, and incident light can be retro-reflected. The metal reflective layer may be manufactured by coating a reflective metal on a substrate material, for example, in this embodiment, a layer of metallic silver may be formed on a polyethylene terephthalate (PET) substrate as the metal reflective layer. The light-reflecting powder layer can directly reflect 85% of light to the light source, 15% of light is transmitted, the metal reflecting layer can achieve a secondary reflection effect on 15% of transmitted light, secondary utilization of the light is guaranteed, the metal reflecting 131 layer and the light-reflecting powder layer 132 are overlapped for use, the reflectivity can reach 95%, and the incident light can be reflected at high intensity.
In practical application, the reflective powder can be divided into white and gray according to color, the particle size can be in the range of 200 meshes (74um) -600 meshes (23um), the reflective light intensity of the reflective layer changes along with the change of the addition amount of the reflective powder, the addition amount of the reflective powder needs to be adjusted according to actual requirements in specific implementation, and the method is not limited herein.
Further, as shown in fig. 4, the diffuse reflection layer 14 includes a plurality of scattered diffuse reflection dots y. The diffuse reflection mesh points y dispersed on the bottom surface of the light guide plate can roughen the bottom surface of the light guide plate, so that light rays incident to the bottom surface of the light guide plate are diffusely reflected back to the inside of the light guide plate, and the diffuse reflection mesh points y can be used as light extraction mesh points to have a diffuse reflection effect on the incident light rays, so that a homogenization effect on the incident light rays is realized.
In practical implementation, since the light intensity at a position closer to the exit center of the point light source is larger and the light intensity is gradually reduced with the gradually increasing angle of the exit ray, the light uniformizing effect on the exit center of the light source needs to be enhanced, in the embodiment of the present invention, for the area covered by the exit ray of each point light source 11, i.e. the above-mentioned area T, as shown in fig. 5, the dispersion density of the reflective dots x included in the reflective layer is reduced with the increasing distance from the point light source. The larger the dispersion density of the reflective dots is, the larger the proportion of the light reflected back to the light guide plate is, the stronger the homogenization effect on the light by the internal circulating reflection of the light guide plate is, and the weaker the homogenization effect on the light by the positions with the smaller dispersion density of the reflective dots is, so that in order to accord with the intensity distribution of the emergent light of the point light source, the dispersion density of the reflective dots x is reduced along with the increase of the distance between the reflective dots x and the point light source, and the effect of comprehensively homogenizing the emergent light of the point light source can be realized.
In practical application, the backlight module with any structure can be adopted to perform regional dimming, so that the display device presents a display image with more bright and dark brightness. The point light source 11 in any of the above backlight modules may be a white light emitting diode.
In addition, the point light source 11 of the backlight module can also be a blue light emitting diode. At this time, if the final emergent light of the backlight module is desired to be white light, as shown in fig. 6, the backlight module further includes: and a quantum dot layer 15 on a side of the light reflecting layer 13 facing away from the light guide plate 12. The quantum dot layer can comprise a mixture of red quantum dot materials and green quantum dot materials, and can generate red light and green light under the excitation of blue light, so that the generated red light, green light and the blue light emitted by the light emitting diode are mixed into white light, and the effect of emitting the white light is finally realized.
In the embodiment of the present invention, the design size of the aperture of the reflective dot x and the distance between two adjacent reflective dots arranged on the light emitting side of the point light source 11 needs to comprehensively consider the light emitting angle of the point light source, the aperture of the light emitting surface, the reflection coefficient of the reflective layer, and other factors to simulate the aperture and the distance of the reflective dot. In view of the above, the embodiment of the invention provides the following relation to simulate the design parameters of the reflective dot, wherein the physical quantities represented by the parameters of the point light source, the light guide plate and the reflective layer can be seen in fig. 7.
The aperture phi HR of the reflective mesh point x satisfies the following relation:
wherein Φ HR represents an aperture of the reflective mesh point, Φ LED represents a light exit aperture of the light source, L represents a thickness of the light guide plate, θ represents a light exit angle of the point light source, and K represents a reflection coefficient.
The Pitch between two adjacent reflective dots satisfies the following relationship:
wherein Pitch represents the distance between two adjacent reflective dots, Φ HR represents the aperture of the reflective dots, and L represents the thickness of the light guide plate.
Taking a blue Light Emitting Diode (LED for short) with a point Light source 3030 encapsulating an EMC bracket as an example, a radiation polar coordinate graph of the blue Light LED in this encapsulation form is shown in fig. 8, an LED Light-Emitting angle θ can be measured and calculated as 120 ° from the radiation polar coordinate shown in fig. 8, a window diameter of an LED Light-Emitting surface, that is, the Light-Emitting aperture Φ LED is 2.1mm, a thickness of a Light guide plate is L1.2 mm, and a reflection coefficient of a reflective layer has a volatility change according to a difference of spectrum of the encapsulated LED. According to the above relation, it can be simulated that under the condition that the coefficient of incidence is 0.65, the aperture Φ HR of the reflective dot x is 2.028mm, and the distance Pitch between two adjacent reflective dots is 3.718 mm.
In specific implementation, the reflective mesh points may be circular mesh points or square mesh points, or mesh points of other patterns may be used as required, which is not limited herein. Different dispersion densities are set according to the positions of the blue LEDs through the reflective mesh points, the blue LEDs emit light to pass through a light guide plate medium, the light emitted from a light source is split through the reflective mesh points on the light emitting surface of the light guide plate, part of light passes through the reflective layer, part of light is reflected back into the cavity of the light guide plate, the light returning into the cavity is subjected to diffuse reflection through the diffuse reflection mesh points (light extraction mesh points) arranged on the lower layer, the light is reflected circularly through the reflective layer and the diffuse reflection layer on the two sides of the light guide plate, and accordingly a blue light surface light source with uniform emergent light is formed on the light emitting surface of the. The structure form that adopts the pointolite to penetrate the light guide plate bottom surface directly, the special design of cooperation light guide plate can make backlight unit have the ultra-thin size of side income formula backlight unit, can realize the partition of hundred grades, thousand grades again to backlight unit, realizes the display technology that multizone was adjusted luminance from this. By adopting any of the backlight module structures provided by the embodiment of the invention, the whole backlight thickness can be reduced to 6mm, the LED spacing can be 0-30mm, the LEDs can realize array arrangement, and hundred-level and thousand-level partitions of backlight can be realized, so that a backlight ultrathin framework can be realized, and a super-multi-partition dimming control scheme can be realized.
In practical applications, as shown in fig. 9, in the backlight module provided in the embodiment of the present invention, the backlight module further includes: a reflector 16 on the side of the point light source 11 facing away from the light guide plate 12, a diffuser 17 on the side of the reflector 13 facing away from the light guide plate 12, and an optical film 18 on the side of the diffuser 17 facing away from the reflector 13. The reflecting plate 16 can reflect the light emitted from the bottom surface of the light guide plate back to the light guide plate 13, so as to improve the utilization rate of the light; the diffusion layer 17 can homogenize the emergent light of the light guide plate, so that the brightness is improved; the optical film 18 has the functions of optical gain and secondary diffusion, and in practical application, a diffusion sheet and a brightness enhancement sheet can be used in combination, so that the light emitting brightness of the front surface of the light guide plate is increased, and the light use efficiency is improved.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, as shown in fig. 10, the display device includes any one of the backlight modules 100 described above and a display panel 200 located on the light emitting side of the backlight module 100. The display panel 200 may be a liquid crystal display panel, and the display device may be a liquid crystal display, a liquid crystal television, or a mobile device such as a mobile phone, a tablet computer, and an intelligent photo album. Because the principle of the display device for solving the problems is similar to that of the backlight module, the implementation of the display device can be referred to that of the backlight module, and repeated details are not repeated.
The backlight module and the display device provided by the embodiment of the invention comprise: the light source module comprises a plurality of point light sources in array distribution, a light guide plate positioned on the light emitting surface of each point light source, a reflecting layer positioned on the surface of one side of the light guide plate, which is far away from the point light sources, and a diffuse reflection layer positioned on the surface of one side of the light guide plate, which is far away from the reflecting layer; wherein, the reflector layer includes: a plurality of reflective dots dispersed on the surface of the light guide plate; the light reflecting dots are used for reflecting the light rays from the light guide plate back to the inside of the light guide plate; and a diffuse reflection layer for diffusely reflecting the light from the light guide plate toward the light guide plate. The invention arranges the point light sources on the lower surface of the light guide plate, which can greatly improve the number of the point light sources, thereby not only enabling the thickness of the backlight module to be equivalent to that of the side-in backlight module, but also increasing the number of dimming areas of the backlight module, meeting the use requirement of an area dimming display system and improving the effect of area dimming.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A backlight module, comprising: the light source module comprises a plurality of point light sources which are distributed in an array mode, a light guide plate, a reflecting layer and a diffuse reflecting layer, wherein the light guide plate is positioned on the light emitting surface of each point light source; wherein,
the light reflecting layer includes: a plurality of reflective dots dispersed on the surface of the light guide plate;
the reflective mesh points are used for reflecting the light rays from the light guide plate back to the inside of the light guide plate;
the diffuse reflection layer is used for diffusely reflecting the light rays from the light guide plate to the light guide plate.
2. The backlight module of claim 1, wherein the light reflecting layer comprises: the metal reflection layer, the reflection powder layer and the bonding layer; the light guide plate is provided with a point light source, the light guide plate is provided with a light reflection layer, the light reflection layer is arranged on one side, deviating from the point light source, of the light guide plate, the metal reflection layer is arranged on one side, deviating from the light guide plate, of the light reflection layer, and the bonding layer is arranged between the light reflection layer and the light guide plate.
3. The backlight module of claim 1, wherein the diffusive reflective layer comprises a plurality of dispersed diffusive reflective dots.
4. The backlight module according to claim 1, wherein the scattering density of the reflective dots in the area covered by the light emitted from one of the point light sources decreases with increasing distance from the point light source.
5. The backlight module as set forth in claim 4, wherein the aperture of the reflective dot satisfies the following relationship:
wherein Φ HR represents an aperture of the reflective dot, Φ LED represents a light exit aperture of the light source, L represents a thickness of the light guide plate, θ represents a light exit angle of the point light source, and K represents a reflection coefficient.
6. The backlight module according to any one of claim 4, wherein the distance between two adjacent reflective dots satisfies the following relationship:
wherein Pitch represents a distance between two adjacent reflective dots, Φ HR represents an aperture of the reflective dots, and L represents a thickness of the light guide plate.
7. The backlight module as claimed in claim 2, wherein the material of the light reflecting powder layer is glass beads.
8. The backlight module according to any one of claims 1-7, wherein the point light source is a blue light emitting diode; the backlight module further comprises: and the quantum dot layer is positioned on one side of the light reflecting layer, which is far away from the light guide plate.
9. The backlight module of claim 1, wherein the backlight module further comprises: the diffusion layer is positioned on one side, away from the light guide plate, of the light reflecting layer, and the optical film is positioned on one side, away from the light reflecting layer, of the diffusion layer.
10. A display device, comprising the backlight module as claimed in any one of claims 1 to 9 and a display panel located at the light exit side of the backlight module.
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| CN201811014698.7A CN109031788A (en) | 2018-08-31 | 2018-08-31 | A kind of backlight module and display device |
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| CN201811014698.7A CN109031788A (en) | 2018-08-31 | 2018-08-31 | A kind of backlight module and display device |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant after: Hisense Visual Technology Co., Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
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Application publication date: 20181218 |