CN106066554B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN106066554B CN106066554B CN201610510005.8A CN201610510005A CN106066554B CN 106066554 B CN106066554 B CN 106066554B CN 201610510005 A CN201610510005 A CN 201610510005A CN 106066554 B CN106066554 B CN 106066554B
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- guide plate
- incident surface
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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
- G02F1/133603—Direct backlight with LEDs
-
- 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
Abstract
The invention relates to the technical field of display, in particular to a backlight module and a display device. The backlight module comprises a light guide plate and a plurality of light sources; the light guide plate is provided with a through groove penetrating through the light guide plate, and the through groove comprises first light adjusting parts in one-to-one correspondence with the light sources and second light adjusting parts in one-to-one correspondence with gaps among the light sources; in each pair of the light source and the first dimming part which correspond to each other, the projection of the light source on the light incident surface is positioned in the projection of the first dimming part on the light incident surface, and the central line of the first dimming part is parallel to the arrangement direction of the plurality of light sources; in each second light modulation part and the corresponding gap, the projection of the second light modulation part on the light incident surface is positioned in the projection of the gap on the light incident surface, and the distance between the central line of the second light modulation part and the light incident surface is gradually reduced from two sides to the middle part. This backlight unit can reduce the luminous dark space in, reduce the distance between light guide plate and the light source and can improve the light utilization ratio of light source, and then be convenient for realize display device's narrow frame design.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
Currently, the backlight module in the liquid crystal display technology generally adopts an LED (Light Emitting Diode) Light source to enter Light from the side of the Light guide plate (side-in type backlight). As shown in fig. 1, in the conventional side-in LED backlight module, light emitted from an LED light source 1 enters from a side surface of a light guide plate 2, and enters a display panel to realize image display after being totally reflected by a reflector 3 and diffusely reflected by the light guide plate 2, and such a backlight module has a problem of a light-emitting dark area (Hotspot) 4.
As shown in fig. 2, since the LED light sources 1 all have a certain light emitting angle (generally 120 °), and at the same time, the LED light sources 1 are arranged in a straight line on the light bar and have a certain distance, a light emitting dark area 4 may be generated between two adjacent LED light sources 1 at the intersection region of the light emitting angles due to the existence of the light emitting angle. If the edge of the Light Guide Plate (LGP)2 is very close to the LED light source 1, the light guide plate 2 does not pass light in the region, thereby generating a light emitting dark area 4.
The current method for solving the problem of the light-emitting dark area 4 includes increasing the distance between the light guide plate 2 and the LED light source 1, and although the light-emitting dark area 4 can be reduced, the distance between the light guide plate 2 and the LED light source 1 is increased, the light utilization rate of the LED light source 1 is reduced, and thus the narrow frame design of the display device is not facilitated.
Disclosure of Invention
The invention provides a backlight module and a display device, wherein the backlight module can reduce the distance between a light guide plate and a light source and improve the light utilization rate of the light source while reducing the light emitting dark area, so that the narrow frame design of the display device is facilitated.
In order to achieve the purpose, the invention provides the following technical scheme:
a backlight module comprises a light guide plate and a plurality of light sources arranged at the light incident side of the light guide plate; the light guide plate is provided with a through groove penetrating through the light guide plate, wherein the through groove comprises a first light adjusting part in one-to-one correspondence with the light sources and a second light adjusting part in one-to-one correspondence with gaps among the light sources, and the light guide plate comprises:
each pair of the light source and the first dimming part corresponds to each other, the projection of the light source on the light incident surface is positioned in the projection of the first dimming part on the light incident surface, and the central line of the first dimming part is parallel to the arrangement direction of the light sources;
in each of the second light adjusting portions and the corresponding gap, a projection of the second light adjusting portion on the light incident surface is located in a projection of the gap on the light incident surface, and a distance between a center line of the second light adjusting portion and the light incident surface gradually decreases from two sides to a middle portion.
In the working process of the backlight module, because the light guide plate is provided with the through groove penetrating through the light guide plate, an air interlayer can be formed in the light guide plate, the through groove comprises a plurality of second light adjusting parts which are in one-to-one correspondence with gaps among a plurality of light sources, in each second light adjusting part and the corresponding gap, the distance between the central line of the second light adjusting part and the light incoming surface of the light guide plate is gradually reduced from two sides to the middle part, therefore, the air interlayer which is in one-to-one correspondence with the gaps among the light sources and is changed with the distance between the central line of the second light adjusting part and the light incoming surface of the light guide plate is formed in the light guide plate, when light emitted by the light sources enters the light incoming surface of the light guide plate and passes through the air interlayer, the light enters the light thinning medium from the light-tight medium, at the moment, the light, simultaneously, the refraction effect of light can be further enhanced through the air interlayer with the changed distance, so that the light irradiation range of the light source is enlarged, the light emitting and mixing effects of the light source are improved, the light emitting dark space between the light sources is reduced, the distance between the light guide plate and the light source can be reduced, the light utilization rate of the light source can be improved, and the narrow frame design of the display device is facilitated.
Preferably, a center line of the second dimming part is arc-shaped.
Preferably, a center line of the second dimming part is V-shaped.
Preferably, the included angle of the V-shape is greater than or equal to 140 ° and less than 180 °.
Preferably, a reflection structure is disposed at a position of the light incident surface of the light guide plate opposite to the second light modulation part.
Preferably, the reflection structure is a reflection film attached to the light incident surface of the light guide plate or a reflection layer evaporated on the light incident surface of the light guide plate.
Preferably, the light guide plate is provided with a quantum dot filling groove which is arranged in parallel with and communicated with the through groove on one side of the through groove away from the light source, the quantum dot filling groove is filled with quantum dots, and the quantum dots can generate complementary light under the excitation of light emitted by the light source to be mixed with the light emitted by the light source to form full-color light.
Preferably, the light source is a blue light emitting light source.
Preferably, the light source is an LED light source.
In addition, the invention also provides a display device which comprises a display panel and any one of the backlight modules provided by the technical scheme.
Drawings
Fig. 1 is a schematic structural diagram of a side-in type LED backlight module in the prior art;
FIG. 2 is a schematic view of the structure of FIG. 1 along the direction A;
fig. 3 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
FIG. 4 is a schematic cross-sectional view taken along line B-B of FIG. 3;
fig. 5 is a schematic cross-sectional view taken along line C-C in fig. 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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 embodiment of the invention provides a backlight module and a display device, wherein the display device is provided with a display panel and the backlight module, the backlight module forms an air interlayer through a through groove arranged in a light guide plate to refract light entering the light guide plate, and a second light adjusting part is arranged in the through groove to scatter and refract the light entering the light guide plate to reduce a light-emitting dark area.
Referring to fig. 3, fig. 4 and fig. 5, a backlight module according to an embodiment of the present invention includes a light guide plate 10 and a plurality of light sources 20 disposed on a light incident side of the light guide plate 10; the light guide plate 10 is provided with a through groove 102 penetrating the light guide plate 10, wherein the through groove 102 includes a first dimming part 1021 corresponding to the light sources 20 one by one, and a second dimming part 1022 corresponding to gaps between the plurality of light sources 20 one by one, wherein:
in each pair of the light source 20 and the first dimming portion 1021 corresponding to each other, a projection of the light source 20 on the light incident surface 101 is located in a projection of the first dimming portion 1021 on the light incident surface 101, and a center line O1 of the first dimming portion 1021 is parallel to an arrangement direction of the plurality of light sources 20;
in each of the second light adjusting portions 1022 and the corresponding gap, a projection of the second light adjusting portion 1022 on the light incident surface 101 is located in a projection of the gap on the light incident surface 101, and a distance between a center line O2 of the second light adjusting portion 1022 and the light incident surface 101 gradually decreases from two sides toward a middle portion.
In the operation of the backlight module, as shown in fig. 3, 4 and 5, since the light guide plate 10 is provided with the through groove 102 penetrating through the light guide plate 10, an air interlayer can be formed in the light guide plate 10 through the through groove 102, and gaps between the plurality of second dimming parts 1022 in the through groove 102 and the plurality of light sources 20 are in one-to-one correspondence, and in each second dimming part 1022 and the corresponding gap, a distance between a center line O2 of the second dimming part 1022 and the light incident surface 101 of the light guide plate 10 gradually decreases from two sides toward a middle portion, an air interlayer which is in one-to-one correspondence with the gaps between the light sources 20 and has a distance varying from the light incident surface 101 of the light guide plate 10 is formed in the light guide plate 10, when light emitted from the light sources 20 enters the light incident surface 101 of the light guide plate 10 and passes through the air interlayer, the light enters the optically thinner medium from the optically denser, as shown in fig. 3, the light L1, the light L2, the light L4 and the light L5 are refracted toward the middle of the second light modulation part 1022, and then the light emitted from the light source 20 can enter the light emitting dark space between the light sources 20 through reflection and scattering of the light in the air interlayer, and as shown in fig. 3, the light L3 and the light L6 are reflected when they do not enter the air interlayer, the light L3 and the light L6 make the light enter the light emitting dark space of the light source 20 through reflection and scattering in the light guide plate 10 in the range out of the light emitting angle, so that the light is filled in the light emitting dark space, and at the same time, the distance between the second light modulation part 1022 and the light incident surface 101 of the light guide plate 10 is changed, as shown in the structure of fig. 4, the distance between the second light modulation part 1022 and the light incident surface 101 of the light guide plate 10 is the largest, so that the air interlayer formed by the second light modulation part can further enhance the refraction effect, in order to enlarge the light irradiation scope of light source 20, improve light-emitting, the mixed light effect of light source 20, and then reduce the luminous dark space between light source 20, owing to can strengthen the refraction effect of light through second portion 1022 of adjusting luminance, can also reduce the distance between light guide plate 10 and the light source 20 and can improve light source 20's light utilization ratio, and then be convenient for realize display device's narrow frame design.
In a specific embodiment, as shown in fig. 3, 4 and 5, the light guide plate 10 is provided with a quantum dot filling groove 103 disposed in parallel with and communicated with the through groove 102 on a side of the through groove 102 away from the light source 20, the quantum dot filling groove 103 is filled with quantum dots 1031, and the quantum dots 1031 can generate complementary color light under excitation of light emitted by the light source 20 to mix with the light emitted by the light source 20 to form full-color light.
The light guide plate 10 of the backlight module is provided with the quantum dot filling grooves 103 arranged in parallel with the through grooves 102, and the quantum dot 1031 is filled in the quantum dot filling grooves 103, because the quantum dot 1031 can generate complementary light under the excitation of light emitted by the light source 20, and the complementary light and the light emitted by the light source 20 are mixed to form full-color light, the types of light sources 20 with different colors in the backlight module can be reduced, and the color gamut of the light source 20 can be improved; meanwhile, the second dimming part 1022 can refract light toward the middle of the gap between the light sources 20, such as light L1, light L2, light L4 and light L5 emitted by the light sources in fig. 3, and the refracted light can excite the quantum dots 1031 of the corresponding positions to generate complementary light, thereby forming full-color light, therefore, the area where the light emitted by the light sources 20 reaches can also be increased through the quantum dots 1031 arranged in the light guide plate 10, and the light-emitting dark area of the backlight module is further reduced.
Specifically, the light source 20 may be a light source 20 emitting blue light.
When the light source 20 of the backlight module emits blue light, the quantum dots 1031 excited by the blue light and capable of generating red light and green light are filled in the quantum dot filling groove 103, and the red light and the green light generated by the quantum dots 1031 and the blue light emitted by the light source 20 are mixed to generate full-color light, so that the full-color light enters the display panel for display.
The light source 20 may also be a light source 20 emitting red light or green light, and correspondingly, the quantum dot 1031 capable of generating blue light and green light when excited by red light is filled in the quantum dot filling groove 103, or the quantum dot 1031 capable of generating blue light and red light when excited by green light is filled in the quantum dot filling groove 103, and light emitted by the light source 20 forms full color light through the quantum dot 1031, so as to meet the requirement of the display panel on backlight.
Therefore, when the light guide plate 10 with the quantum dots 1031 is used, the backlight module can use the single color light source 20 to meet the requirements of the display panel, so that the requirements of the backlight module on the light sources 20 with various colors can be reduced, the color gamut of the light sources 20 can be improved, and the light-emitting dark area of the backlight module can be reduced.
In addition, the light source 20 may be an LED light source 20, such as an LED light source 20 that emits blue light.
Because the LED light source 20 has the characteristics of small size, low voltage, high brightness, and low heat, the backlight module using the LED light source 20 has the characteristics of small size, high brightness, and low requirement for heat dissipation.
Further, the center line O2 of the second dimming part 1022 is arc-shaped.
In order to further improve the refraction effect of the second light adjusting part 1022 on the light emitted by the light source 20 and further reduce the light-emitting dark space of the backlight module, in the actual production process, the central line O2 of the second light adjusting part 1022 may be an arc, meanwhile, as shown in the structure of fig. 3, the central line O2 of the second light adjusting part 1022 may also be a V-shaped, and the included angle a of the V-shaped central line O2 is greater than or equal to 140 ° and less than 180 °, for example, the included angle a of the V-shaped central line may be specifically 140 °, 143 °, 145 °, 148 °, 150 °, 154 °, 158 °, 160 °, 163 °, 166 °, 170 °, 172 °, 175 °, 178 °, 179 °; when the center line O2 of the second light adjusting part 1022 is V-shaped, the second light adjusting part 1022 is also advantageous for manufacturing, and thus the manufacturing process can be simplified, and the manufacturing efficiency and the manufacturing accuracy can be improved.
In addition, the V-shaped included angle a of the central line O2 of the second light modulating portion 1022 may also be adjusted according to the distance between the adjacent light sources 20, so as to optimize the refraction effect of the second light modulating portion 1022 on the light emitted by the light sources 20, and further reduce the dark lighting area of the backlight module.
When the included angle a of the V-shape is 163 °, the second dimming part 1022 of the through groove 102 in the light guide plate 10 has the best refraction effect on the light emitted from the light source 20, so as to minimize the dark light area of the light incident surface 101 of the light guide plate 10 and the distance between the light guide plate 10 and the light source 20, thereby minimizing the bezel of the display device.
In addition to the above-mentioned backlight module, as shown in fig. 3, a reflection structure 30 is disposed at a position where the light incident surface 101 of the light guide plate 10 faces the second light modulation part 1022.
Through the reflection structure 30 disposed at the portion of the light incident surface 101 of the light guide plate 10 opposite to the second dimming part 1022, the light reflected to the reflection structure 30 in the light guide plate 10 can be reflected into the light guide plate 10 again, and the light in the light guide plate 10 is prevented from being emitted to the outside of the light guide plate 10 through the light incident surface 101 of the light guide plate 10, so that the light density at the gap between the light sources 20 is improved, the brightness at the gap between the light sources 20 is further improved, the light-emitting dark area between the light sources 20 is further reduced, and the light utilization rate of the light sources 20 is improved. The reflective structure 30 disposed on the light incident surface 101 of the light guide plate 10 may be a reflective film attached to the light incident surface 101 of the light guide plate 10, and the reflective structure 30 may also be a reflective layer deposited on the light incident surface 101 of the light guide plate 10.
As shown in the structure of fig. 3, the light L3 and the light L6 emitted by the light source 20 are totally reflected when they irradiate the second dimming part 1022, so that the light is reflected multiple times in the light emitting dark region of the light incident surface 101 of the light guide plate 10, and further the brightness of the light in the light emitting dark region is improved, in order to further improve the total reflection of the light emitted by the light source 20 in the light emitting dark region, when the included angle formed between the light emitted by the light source 20 and the light incident surface 101 of the light guide plate 10 is 35 ° to 40 °, the light can be totally reflected, as shown in fig. 3 as light L3 and light L6, and the included angle formed between the light emitted by the light source 20 and the light incident surface 101 of the light guide plate 10 may be 35 °, 36 ° 36.6 °, 37 ° 37.2 °, 37.5 °, 37.8 °, 38.5 °, 39.
In addition, an embodiment of the present invention further provides a display device, which includes a display panel and any one of the backlight modules provided in the above embodiments.
After the display device adopts any one of the backlight modules provided in the above embodiments, the air interlayer formed by the through groove 102 in the light guide plate 10 refracts the light entering the light incident surface 101 of the light guide plate 10, so that the distance between the light guide plate 10 and the light source 20 can be reduced while the light emitting dark area of the backlight module is reduced, the frame of the display device is reduced, and the narrow frame design of the display device is convenient to realize.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of 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 (7)
1. A backlight module comprises a light guide plate and a plurality of light sources arranged on one side of a light incident surface of the light guide plate; the light guide plate is provided with a through groove penetrating through the light guide plate, wherein the through groove comprises a first light modulation part in one-to-one correspondence with the light sources and a second light modulation part in one-to-one correspondence with gaps among the plurality of light sources, and the light guide plate is characterized in that:
each pair of the light source and the first dimming part corresponds to each other, the projection of the light source on the light incident surface is positioned in the projection of the first dimming part on the light incident surface, and the central line of the first dimming part is parallel to the arrangement direction of the light sources;
in each second light modulation part and the corresponding gap, the projection of the second light modulation part on the light incident surface is positioned in the projection of the gap on the light incident surface, and the distance between the center line of the second light modulation part and the light incident surface is gradually reduced from two sides to the middle part;
the central line of the second light adjusting part is V-shaped;
the included angle of the V-shaped part is larger than or equal to 140 degrees and smaller than 180 degrees.
2. The backlight module as claimed in claim 1, wherein a reflective structure is disposed at a portion of the light incident surface of the light guide plate opposite to the second light-adjusting portion.
3. The backlight module as claimed in claim 2, wherein the reflective structure is a reflective film attached to the light incident surface of the light guide plate or a reflective layer evaporated on the light incident surface of the light guide plate.
4. The backlight module according to claim 1, wherein the light guide plate is provided with a quantum dot filling groove arranged in parallel with and communicated with the through groove on a side of the through groove away from the light source, the quantum dot filling groove is filled with quantum dots, and the quantum dots can generate complementary light under excitation of light emitted by the light source to mix with the light emitted by the light source to form full-color light.
5. A backlight module according to claim 4, wherein the light source is a blue light emitting light source.
6. The backlight module according to claim 5, wherein the light source is an LED light source.
7. A display device comprising a display panel, characterized in that it comprises a backlight module according to any one of claims 1 to 6.
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| CN201610510005.8A CN106066554B (en) | 2016-06-30 | 2016-06-30 | Backlight module and display device |
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| CN201610510005.8A CN106066554B (en) | 2016-06-30 | 2016-06-30 | Backlight module and display device |
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| CN106066554A CN106066554A (en) | 2016-11-02 |
| CN106066554B true CN106066554B (en) | 2020-04-24 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110828645B (en) * | 2018-08-10 | 2021-11-23 | 海信视像科技股份有限公司 | Light-emitting element, backlight module and display device |
| CN112162435B (en) * | 2020-11-13 | 2022-04-08 | 福州大学 | Lateral-entering type quantum dot backlight module structure |
| CN114859457A (en) * | 2022-05-13 | 2022-08-05 | 深圳创维－Rgb电子有限公司 | Side-in light guide structure, backlight module and display device |
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