CN108518612B - Light guide plate and backlight module - Google Patents
Light guide plate and backlight module Download PDFInfo
- Publication number
- CN108518612B CN108518612B CN201810336279.9A CN201810336279A CN108518612B CN 108518612 B CN108518612 B CN 108518612B CN 201810336279 A CN201810336279 A CN 201810336279A CN 108518612 B CN108518612 B CN 108518612B
- Authority
- CN
- China
- Prior art keywords
- fluorescent powder
- light guide
- guide plate
- dots
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000843 powder Substances 0.000 claims abstract description 46
- 239000000758 substrate Substances 0.000 claims abstract description 38
- 238000009792 diffusion process Methods 0.000 claims description 20
- 239000011521 glass Substances 0.000 claims description 5
- 108010043121 Green Fluorescent Proteins Proteins 0.000 claims description 2
- 230000005284 excitation Effects 0.000 abstract description 22
- 230000000694 effects Effects 0.000 abstract description 7
- 239000011159 matrix material Substances 0.000 abstract description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 24
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/02—Refractors for light sources of prismatic shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a light guide plate, which comprises a substrate, wherein the substrate is provided with an upper surface and a lower surface which are oppositely arranged, the upper surface is used as a light-emitting surface of the substrate, the lower surface is provided with ink dots, the upper surface is provided with fluorescent powder dots, the ink dots and the fluorescent powder dots are arranged in a staggered manner, fluorescent powder is arranged on the ink dots and the fluorescent powder dots, and the fluorescent powder is excited by blue light. According to the light guide plate provided by the invention, the excitation light is emitted from the upper surface of the matrix after multiple reflections, so that the excitation light can be fully excited by the fluorescent powder, the luminous chromaticity is uniform, and the light guide effect is improved. The invention also provides a backlight module with the light guide plate.
Description
Technical Field
The invention relates to the field of backlight, in particular to a light guide plate and a backlight module.
Background
The planar light guide plate is used as the main component of light transmission in the back light module, and its light guiding effect determines the uniformity and comfort of the emitted light. Generally, the light guide plate is made of acrylic material, but because of its lower strength, when used as the light guide plate, the light guide plate is often thicker, and is difficult to meet the processing requirement of light and thin backlight module, in order to solve the problem, the light guide plate made of acrylic material is gradually replaced by the light guide plate made of glass material with high strength and thin thickness, but the light absorption of the glass light guide plate to light is serious, resulting in uneven luminous chromaticity and poor light guide effect.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: in order to overcome the problems in the prior art, a light guide plate and a backlight module with uniform luminous chromaticity and good light guide effect are provided.
The technical scheme adopted for solving the technical problems is as follows: the light guide plate comprises a substrate, wherein the substrate is provided with an upper surface and a lower surface which are oppositely arranged, the upper surface is used as a light-emitting surface of the substrate, the lower surface is provided with ink dots, the upper surface is provided with fluorescent powder dots, the ink dots and the fluorescent powder dots are arranged in a staggered manner, fluorescent powder is arranged on the ink dots and the fluorescent powder dots, and the fluorescent powder is excited by blue light.
Further, a medium layer is arranged on the upper surface, the fluorescent powder dots are arranged on the medium layer, and the refractive index of the medium layer is smaller than that of the matrix and larger than that of air.
Further, the size of the phosphor dots is smaller than the size of the ink dots.
Further, the ink dots and the fluorescent powder dots are bulges or grooves.
Further, the substrate is a glass plate.
Further, the fluorescent powder dots and the printing ink dots are arranged in a staggered mode.
Further, the substrate is further provided with a side surface, the side surface is located between the upper surface and the lower surface, and the side surface is used as a light incident surface.
Further, the fluorescent powder is yellow fluorescent powder, or doped yellow fluorescent powder and red fluorescent powder, or doped green fluorescent powder and red fluorescent powder.
A backlight module comprising the light guide plate of any one of the above.
Further, the backlight module further comprises a reflecting plate positioned below the light guide plate, a diffusion assembly positioned above the light guide plate and a blue LED light source positioned at the side part of the light guide plate, wherein the diffusion assembly comprises a prism sheet, and a first diffusion sheet and a second diffusion sheet which are respectively positioned at the upper side and the lower side of the prism sheet, and the first diffusion sheet is positioned at one side of the prism sheet away from the light guide plate.
The beneficial effects of the invention are as follows: according to the light guide plate or the backlight module provided by the invention, the excitation light is emitted from the upper surface of the matrix after multiple reflections, so that the excitation light can be fully excited by the fluorescent powder, the luminous chromaticity is uniform, and the light guide effect is improved.
Drawings
The invention is further described below with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the invention;
fig. 2 is a schematic structural diagram of a backlight module according to a second embodiment of the invention.
In the figure: 10. the light guide plate comprises a light guide plate body 11, a substrate body 101, an upper surface 102, a lower surface 104, ink dots 105, fluorescent powder dots 106, fluorescent powder 107, a medium layer 20, a reflecting plate 30, a diffusion assembly 31, a prism sheet 32, a first diffusion sheet 33, a second diffusion sheet 40 and a blue LED light source.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings. The figure is a simplified schematic diagram illustrating the basic structure of the invention only by way of illustration, and therefore it shows only the constitution related to the invention.
Example 1
Referring to fig. 1, a backlight module is provided according to an embodiment of the invention, and the backlight module includes a light guide plate 10, a reflective plate 20 disposed below the light guide plate 10, a diffusion assembly 30 disposed above the light guide plate 10, and a blue LED light source 40 disposed at a side portion of the light guide plate 10. In use, light emitted from the blue LED light source 40 passes through the light guide plate 10, then exits from the upper surface of the light guide plate 10, and finally exits through the diffusion assembly 30.
Specifically, the light guide plate 10 includes a substrate 11, and the substrate 11 is a glass plate. The substrate 11 has an upper surface 101, a lower surface 102, and a side surface 103, wherein the upper surface 101 is opposite to the lower surface 102, the side surface 103 is located between the upper surface 101 and the lower surface 102, the side surface 103 is used as a light incident surface of the substrate 11, and the upper surface 101 is used as a light emergent surface of the substrate 11.
In this embodiment, the ink dots 104 are provided on the lower surface 102, the phosphor dots 105 are provided on the upper surface 101, and the phosphor 106 is provided on both the ink dots 104 and the phosphor dots 105.
Specifically, the ink dots 104 are projections provided on the lower surface 102 of the substrate 11, and the phosphor dots 105 are projections provided on the upper surface 101 of the substrate 11. It will be appreciated that ink dots 104 may also be grooves recessed in lower surface 102 of substrate 11, and that phosphor dots 105 may also be grooves recessed in upper surface 101 of substrate 11, without limitation.
The phosphor 106 is excited by blue light, and the phosphor 106 is yellow phosphor. It will be appreciated that in other embodiments not shown, the phosphor 106 may also be a doped yellow phosphor and red phosphor, or a doped green phosphor and red phosphor.
The blue LED light source 40 is located on one side of the side 103 of the base 11, and the light emission axis of the blue LED light source 40 is located between the upper surface 101 and the lower surface 102 of the base 11. When blue LED light source 40 emits blue excitation light into substrate 11 through side 103, the excitation light is refracted and reflected at ink dots 104 of substrate 11, the excitation light which is not in contact with phosphor 106 on ink dots 104 is still blue light after refraction and reflection, the excitation light which is in contact with phosphor 106 on ink dots 104 is changed into yellow light, and when both blue light and yellow light are emitted from upper surface 101 of substrate 11, the two lights are mixed and emitted from upper surface 101 to obtain white light.
In the above process, when the blue excitation light which is not in contact with the phosphor powder 106 on the ink dots 104 is reflected by the ink dots 104 and is further emitted to the upper surface 101 of the substrate 11, the blue excitation light may be in contact with the phosphor powder 106 on the upper surface 101 and reflected by the phosphor powder dots 105 and emitted to the lower surface 102 of the substrate 11, and then in contact with the phosphor powder 106 on the ink dots 104 again and reflected by the ink dots 104, so that the blue excitation light is finally excited to become yellow and emitted through the upper surface 101 of the substrate 11, and white light is obtained after the blue excitation light is mixed with the blue excitation light. Therefore, the blue excitation light has high probability of multiple reflections in the propagation process of the substrate 11, so that the emitted light is uniform, and the light guiding effect is good.
In addition, in this embodiment, the ink dots 104 and the phosphor dots 105 are protrusions, the protrusions have a hemispherical structure, and the size of the phosphor dots 105 is smaller than the size of the ink dots 104, so that more excitation light can be emitted from the upper surface 101 of the substrate 11, and the light output is ensured. Meanwhile, the fluorescent powder dots 105 and the ink dots 104 are arranged in a staggered manner, so that the condition that excitation light is repeatedly reflected between the two opposite fluorescent powder dots 105 and the ink dots 104 and cannot be emitted from the upper surface 101 is avoided. It will be appreciated that in other embodiments not shown, the ink dots 104 and the phosphor dots 105 may also be grooves, without limitation.
The diffusion component 30 includes a prism sheet 31, a first diffusion sheet 32 located above the prism sheet 31, and a second diffusion sheet 33 located below the prism sheet 31, when the excitation light is emitted from the lower surface 102 of the substrate 11, the excitation light can be finally emitted from the upper surface 101 due to the reflection of the emission plate 20, so that the scattering of the excitation light is avoided, the intensity of the emitted white light is ensured, and the planar light is formed under the action of the prism sheet 31, the first diffusion sheet 32, and the second diffusion sheet 33.
According to the light guide plate 10 or the backlight module provided by the invention, the excitation light is emitted from the upper surface 102 of the substrate 11 after multiple reflections, so that the excitation light can be fully excited by the fluorescent powder 106, the luminous chromaticity is uniform, and the light guide effect is improved.
Example two
Referring to fig. 2, the light guide plate 10 provided in the second embodiment of the present invention is different from the light guide plate 10 in the first embodiment in that: the upper surface 102 of the substrate 11 is provided with a dielectric layer 107, the phosphor dots 105 are disposed on the upper surface of the dielectric layer 107, and the refractive index of the dielectric layer 107 is smaller than the refractive index of the substrate 11 and larger than the refractive index of air. In the present embodiment, the dielectric layer 107 is an oil film. Therefore, when the excitation light is emitted from the upper surface 102 of the substrate 11 and the dielectric layer 107 in sequence, the emission of the light from the upper surface of the dielectric layer 107 can be ensured as much as possible, so that the light is more concentrated.
The second embodiment of the present invention further provides a backlight module with the light guide plate 10, and other structures in the backlight module are the same as those in the first embodiment, and will not be repeated here.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (7)
1. A light guide plate, characterized in that: the light guide plate comprises a substrate, wherein the substrate is a glass plate, the substrate is provided with an upper surface and a lower surface which are oppositely arranged, the upper surface is used as a light-emitting surface of the substrate, the lower surface is provided with ink dots, the upper surface is provided with fluorescent powder dots, the ink dots and the fluorescent powder dots are arranged in a staggered manner, fluorescent powder is arranged on the ink dots and the fluorescent powder dots, the fluorescent powder is excited by blue light, the upper surface is provided with a medium layer, the fluorescent powder dots are arranged on the medium layer, the refractive index of the medium layer is smaller than that of the substrate and larger than that of air, the size of the fluorescent powder dots is smaller than that of the ink dots, and the fluorescent powder dots are bulges convexly arranged on the upper surface of the substrate.
2. The light guide plate according to claim 1, wherein: the printing ink dots and the fluorescent powder dots are bulges or grooves.
3. The light guide plate according to claim 1, wherein: the fluorescent powder dots and the printing ink dots are arranged in a staggered mode.
4. A light guide plate according to any one of claims 1-3, wherein: the substrate is also provided with a side surface, the side surface is positioned between the upper surface and the lower surface, and the side surface is used as a light incident surface.
5. The light guide plate according to claim 4, wherein: the fluorescent powder is yellow fluorescent powder, or doped yellow fluorescent powder and red fluorescent powder, or doped green fluorescent powder and red fluorescent powder.
6. A backlight module is characterized in that: the backlight module comprises the light guide plate as claimed in any one of claims 1 to 5.
7. The backlight module according to claim 6, wherein: the backlight module further comprises a reflecting plate positioned below the light guide plate, a diffusion assembly positioned above the light guide plate and a blue LED light source positioned at the side part of the light guide plate, wherein the diffusion assembly comprises a prism sheet, and a first diffusion sheet and a second diffusion sheet which are respectively positioned on the upper side and the lower side of the prism sheet, and the first diffusion sheet is positioned on one side of the prism sheet away from the light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810336279.9A CN108518612B (en) | 2018-04-16 | 2018-04-16 | Light guide plate and backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810336279.9A CN108518612B (en) | 2018-04-16 | 2018-04-16 | Light guide plate and backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108518612A CN108518612A (en) | 2018-09-11 |
| CN108518612B true CN108518612B (en) | 2024-06-14 |
Family
ID=63429360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810336279.9A Active CN108518612B (en) | 2018-04-16 | 2018-04-16 | Light guide plate and backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108518612B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108518612A (en) | 2018-09-11 |
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