CN105242457A - Light guide device with high color saturation - Google Patents
Light guide device with high color saturation Download PDFInfo
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- CN105242457A CN105242457A CN201510777523.1A CN201510777523A CN105242457A CN 105242457 A CN105242457 A CN 105242457A CN 201510777523 A CN201510777523 A CN 201510777523A CN 105242457 A CN105242457 A CN 105242457A
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- 239000010409 thin film Substances 0.000 claims description 44
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- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 5
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 5
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 5
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- -1 polyethylene terephthalate Polymers 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 9
- 239000012788 optical film Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005424 photoluminescence Methods 0.000 description 3
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- 230000002277 temperature effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- 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
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a light guide device with high color saturation. The light guide device comprises a blue LED light source, a first light guide plate, a second light guide plate, a quantum dot film and a first reflective sheet. The first light guide plate is used for transmitting light emitted out by the blue LED light source to the side far away from the light source. The second light guide plate is arranged above the first light guide plate. The quantum dot film is arranged on the side, far away from the blue LED light source, of the second light guide plate and used for converting the blue light on the light outgoing end face of the first light guide plate into white light. Compared with the prior art, the light guide device is designed to be of a double-light-guide-plate structure, the blue light is transmitted to the side far away from the LED light source through the first light guide plate and emitted into the quantum dot film on the lateral side of the second light guide plate from the light outgoing end face of the first light guide plate, the blue light is converted by the quantum dot film into the white light and then guided into the second light guide plate, and therefore even whole-face light outgoing is achieved. In this way, the use area of the quantum dot film of the light guide device can be more reduced, and then cost can be reduced.
Description
Technical Field
The present disclosure relates to backlight modules, and particularly to a light guide device with high color saturation.
Background
In recent years, with the rapid development of consumer electronics, the market demand for display devices of various sizes is increasing, and among them, liquid crystal display devices (LCDs) are widely used in consumer electronics or computer products such as portable televisions, mobile phones, camcorders, notebook computers, and desktop monitors due to their advantages of light weight, thin profile, low power consumption, no radiation, and the like, and become the mainstream of displays. Liquid crystal is a passive light emitting device, and requires light emitted from a backlight source to display image content, and common backlight sources include a cold cathode tube (CCFL), a Light Emitting Diode (LED), and the like. Among them, LEDs are rapidly replacing CCFLs with advantages of high lumen efficiency, high color rendering capability, low voltage driving, no fragile components, no heavy metal materials, etc. as the mainstream technology of backlights. Since the liquid crystal panel does not emit light, the backlight module is required to display images, and thus the backlight module has become one of the key components of the liquid crystal display device. Generally, the backlight module can be divided into a side-type backlight module and a direct-type backlight module according to the incident position of the light source. For example, the direct-type backlight module is arranged behind the liquid crystal panel to directly form a surface light source to be provided for the liquid crystal panel; the side-in backlight module is formed by disposing a backlight LED light bar (Lightbar) at the edge of a back plate at the rear side of a liquid crystal panel, wherein light emitted by the LED light bar enters a Light Guide Plate (LGP) from a light incident surface at one side of the light guide plate, is emitted from a light emitting surface of the light guide plate after being reflected and diffused, and is then generated into a surface light source by an optical film set to be provided to the liquid crystal panel.
Solid state lighting, on the other hand, includes two typical architectures: one is to combine red, green and blue LEDs; one is a combination of an ultraviolet LED chip or a blue LED chip with a color conversion phosphor. Taking the latter as an example, a light conversion layer containing a color conversion phosphor often requires a high photoluminescence quantum efficiency, a suitable refractive index, good light resistance, and a desired luminescent color. Here, a Quantum Dot (QD) is a light-emitting semiconductor crystal having a narrow and tunable photoluminescence spectrum, high photoluminescence quantum efficiency, and thermal stability inherent to inorganic materials, and also, the quantum dot can efficiently convert blue light into white light of high saturation, thereby displaying colors of the widest color gamut on a screen.
In the prior art, when the quantum dots are applied to the structural design of the backlight module, the quantum dots are generally classified into three types: quantum dot thin films (QDfilm), quantum dot tubes (QDtube), and Quantum Dot Light Emitting Diodes (QDLED). Because the efficiency of the quantum dots is closely related to the service life and the temperature, and the quantum dot tube and the quantum dot light-emitting diode are affected by the temperature and are subjected to thermal failure, the overall luminous efficiency is reduced, so that the quantum dot film is generally placed at the position of an optical film of a backlight module at present, and the brightness enhancement film and two prism sheets (prism sheets) are matched, so that the overall luminous efficiency reaches 85% of the LED luminance of the common fluorescent powder. However, the current quantum dot thin film layer has an excessively large area and is relatively high in cost.
In view of the above, a problem to be solved by the related art in the art is how to design a new backlight module structure, which not only takes advantage of high photoluminescence quantum efficiency of the quantum dots, but also reduces the use area and cost thereof, thereby overcoming the above-mentioned defects or shortcomings in the prior art.
Disclosure of Invention
Aiming at the defects of the backlight module with the quantum dot film layer in the prior art, the invention provides a novel light guide device with high color saturation.
According to an aspect of the present invention, there is provided a light guide device with high color saturation, including:
a blue LED light source;
the first light guide plate is arranged on the side face of the blue LED light source and used for transmitting the light emitted by the blue LED light source to the opposite side far away from the blue LED light source;
the second light guide plate is arranged above the first light guide plate;
the quantum dot thin film layer is arranged on one side, far away from the blue LED light source, of the second light guide plate and used for converting blue light from the light-emitting end face of the first light guide plate into white light; and
and the first reflector plate is positioned below the first light guide plate and used for reflecting part of blue light emitted by the first light guide plate back to the inside of the first light guide plate.
In one embodiment, a part of blue light emitted from the first light guide plate is reflected by the surface of the quantum dot thin film layer, another part of blue light is converted into red light and green light by the quantum dot thin film layer, and the quantum dot thin film layer is used for mixing the reflected blue light, the converted red light and the green light to generate the white light.
In one embodiment, the first light guide plate or the second light guide plate is formed by splicing a plurality of light guide plates.
In an embodiment of the disclosure, the light guide device further includes a second reflective sheet disposed on a side of the quantum dot thin film layer away from the second light guide plate, and the second reflective sheet is configured to reflect a portion of the red light, a portion of the green light, and a portion of the blue light penetrating through the quantum dot thin film layer back, so as to reduce light energy loss.
In an embodiment of the present invention, the light guide device further includes a third reflective sheet located above the second light guide plate, the third reflective sheet has a plurality of through holes distributed at intervals, and the blue light emitted from the second light guide plate is returned to the quantum dot thin film layer through the through holes.
In one embodiment, the light-emitting end surface of the first light guide plate is an inclined surface facing the second light guide plate, and the inclination angle is 20-45 degrees.
In one embodiment, the longest distance from the light-emitting end surface of the first light guide plate to the quantum dot thin film layer is less than the height of the second light guide plate and tan θ1A product of where θ1Is the critical angle of total reflection of the first light guide plate.
In one embodiment, the light-emitting end surface of the first light guide plate is a triangular groove or a rounded groove.
In one embodiment, the first light guide plate and the second light guide plate are made of polyethylene terephthalate (PET), Polycarbonate (PC) or polymethyl methacrylate (PMMA).
In one embodiment, the light guide device is used as a side-in backlight module or a direct-in backlight source.
The light guide device with high color saturation comprises a blue LED light source, a first light guide plate, a second light guide plate, a quantum dot film layer and a first reflector plate, wherein the first light guide plate is arranged on the side face of the blue LED light source and used for transmitting light emitted by the blue LED light source to the opposite side far away from the blue LED light source, the second light guide plate is arranged above the first light guide plate, the quantum dot film layer is arranged on the side far away from the blue LED light source of the second light guide plate, the quantum dot film layer converts blue light from the light emitting end face of the first light guide plate into white light, and the first reflector plate is positioned below the first light guide plate so as to reflect part of the blue light back to the inside of the first light guide plate. Compared with the prior art, the LED light source structure adopts the structural design of double light guide plates, blue light is transmitted to the other side far away from the LED light source through the first light guide plate and is incident to the quantum dot thin film layer on the side face of the second light guide plate from the light-emitting end face of the first light guide plate, and the blue light is converted into white light by the quantum dot thin film layer and then is guided into the second light guide plate, so that the light is uniformly emitted in the whole face. Therefore, the quantum dot thin film layer is arranged on one side far away from the LED light source, the using area of the quantum dot thin film layer can be further reduced, and the cost is further reduced.
Drawings
The various aspects of the present invention will become more apparent to the reader after reading the detailed description of the invention with reference to the attached drawings. Wherein,
FIG. 1 is a schematic structural diagram of a backlight module having a quantum dot thin film layer in the prior art;
FIG. 2 is a schematic structural diagram of a light guide device with high color saturation according to an embodiment of the present invention;
FIG. 3A shows a first embodiment of the light guide device shown in FIG. 2;
FIG. 3B shows a second embodiment of the light guide device shown in FIG. 2;
FIG. 3C shows a third embodiment of the light guide device shown in FIG. 2;
FIG. 3D shows a fourth embodiment of the light guide device shown in FIG. 2;
FIG. 3E shows a fifth embodiment of the light guide device shown in FIG. 2;
FIG. 3F shows a sixth embodiment of the light guide device shown in FIG. 2;
FIG. 4 is a schematic structural diagram of a first light guide plate with a better light-emitting energy ratio in the light guide device of FIG. 2;
fig. 5 is a schematic structural view of a liquid crystal display device using the light guide device of fig. 2 according to another embodiment of the present invention; and
fig. 6 is a schematic structural diagram of a liquid crystal display device using the light guide device of fig. 2 according to still another embodiment of the present invention.
Detailed Description
In order to make the present disclosure more complete and complete, reference is made to the accompanying drawings, in which like references indicate similar or analogous elements, and to the various embodiments of the invention described below. However, it will be understood by those of ordinary skill in the art that the examples provided below are not intended to limit the scope of the present invention. In addition, the drawings are only for illustrative purposes and are not drawn to scale.
Specific embodiments of various aspects of the present invention are described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a backlight module having a quantum dot thin film layer in the prior art.
Referring to fig. 1, the conventional backlight module includes a blue LED light source 101, a quantum dot film (quantum dot film)103, a Light Guide Plate (LGP) 105, a quantum dot reflective layer 107, and reflective sheets (reflective sheet)109 and 111.
Wherein the quantum dot thin film layer 103 is disposed between the blue LED light source 101 and the light guide plate 105. The quantum dot thin film layer 103 is used for transmitting a part of blue light emitted from the light source 101 and converting another part of the blue light into red light and green light. As shown in fig. 1, the blue light is indicated by a thick line L1, and the red and green light are indicated by a thin line L2. The reflective sheet 109 is disposed under the light guide plate 105, and the reflective sheet 111 is disposed on a side of the light guide plate 105 away from the blue LED light source, and they reflect light emitted from the lower and right sides of the light guide plate 105 back into the inside of the light guide plate 105 to reduce light energy loss. As is well known, the light-exiting end face is above the light guide plate 105, and the light exiting from the light guide plate is reflected and converted by the quantum dot reflective sheet 107 to generate uniformly mixed white light.
However, as mentioned in the background section, quantum dot films are susceptible to thermal degradation due to temperature effects. In fig. 1, the quantum dot thin film layer 103 is too close to the blue LED light source 101 and the thermal depletion is severe. In addition, the quantum dot thin film layer 103 also reflects part of the light back to the blue LED light source 101, which not only causes energy loss, but also aggravates the thermal failure effect. In addition, the quantum dot reflective layer 107 disposed above the light guide plate 105 is a reflective layer made of a whole sheet material, which has an excessively large area and is expensive.
To address the above-described deficiencies or inadequacies of the prior art, the present invention discloses a novel light guide device with high color saturation. Fig. 2 is a schematic structural diagram of a light guide device with high color saturation according to an embodiment of the present invention. In the following description, blue light is indicated by a thick line L1, and red light and green light are indicated by a thin line L2, unless otherwise specified.
Referring to fig. 2, in this embodiment, the light guide device of the present invention employs a dual light guide plate stack design. Specifically, the light guide device includes a blue LED light source 201, a first light guide plate (firstLGP)203, a second light guide plate (second lgp)205, a quantum dot thin film layer 207, and a first reflector 209. Preferably, the light guide device can be used as a side-in type backlight module, or the light guide device can be used as a direct-in type backlight source.
In detail, the first light guide plate 203 is disposed on a side surface of the blue LED light source 201. The first light guide plate 203 is used for guiding the blue light L1 emitted from the blue LED light source 201 to the opposite side away from the blue LED light source 201. The second light guide plate 205 is disposed above the first light guide plate 203, for example, a light-exiting end surface of the first light guide plate 203 is disposed opposite to a light-entering end surface of the second light guide plate 205. The quantum dot film layer 207 is disposed on a side of the second light guide plate 205 away from the blue LED light source 201. In this way, the quantum dot thin film layer 207 can convert the blue light from the light-emitting end surface of the first light guide plate 203 into the white light. The first reflective sheet 209 is located below the first light guide plate 203, and is used for reflecting a part of the blue light emitted from the first light guide plate 203 from below back to the inside of the first light guide plate 203. In addition, another quantum dot thin film layer 211 with a smaller size can be further mounted above the first reflection sheet 209 and near the light exit end face of the first light guide plate 203 to increase the utilization efficiency of light energy.
In one embodiment, a portion of the blue light emitted from the first light guide plate 203 is reflected by the surface of the quantum dot thin film layer 207, and another portion of the blue light is converted into red light and green light by the quantum dot thin film layer 207. The quantum dot thin film layer 207 is used for mixing the reflected blue light, the converted red light and the green light to generate white light.
In one embodiment, the first light guide plate and the second light guide plate may be made of polyethylene terephthalate (PET), Polycarbonate (PC) or polymethyl methacrylate (PMMA).
In the invention, the blue light is transmitted to the other side far away from the blue LED light source through the first light guide plate, and is incident to the quantum dot film layer on the side surface of the second light guide plate from the light-emitting end surface of the first light guide plate, and the blue light is converted into the white light by the quantum dot film layer and then is guided into the second light guide plate, so that the light can be uniformly emitted in the whole surface. Because the quantum dot thin film layer is arranged on one side of the first light guide plate far away from the LED light source, the problem of serious heat failure in the prior art can not occur, the using area of the quantum dot thin film layer can be reduced, and the cost is further reduced.
Fig. 3A to 3F show a plurality of different embodiments of the light guide device shown in fig. 2, respectively.
As shown in fig. 3A, in this embodiment, the main difference from the light guide apparatus of fig. 2 is that a larger power LED is selected for the blue LED light source 301. This is because, although the temperature rise is higher as the power of the LED is higher, the quantum dot thin film layer 207 is disposed at the right side of the first light guide plate 203, which is distant from the LED light source and is less affected by the temperature. In fig. 3B, the second light guide plate 205 is formed by splicing a plurality of light guide plates. Of course, in other embodiments, the first light guide plate 203 may be formed by splicing a plurality of light guide plates.
Referring to fig. 3C and 3D, the main difference between them and fig. 2 is that the light-exiting end surface of the first light guide plate is specially designed to concentrate the exiting blue light to be incident on the lower side of the incident end surface of the second light guide plate. For example, the light exit end surface of the first light guide plate 203 of fig. 3C is designed as a triangular groove S1. For another example, the light-emitting end surface of the first light guide plate 203 in fig. 3D is designed as a rounded groove S2. In addition, experimental data tests show that the angle theta of the light rays incident to the light-emitting surface of the second light guide plate31And theta32Are all greater than 40 degrees.
As shown in fig. 3E, in this embodiment, the light guide device further includes a second reflective sheet 213 disposed on a side of the quantum dot thin film layer 207 away from the second light guide plate 205. The second reflective sheet 213 serves to reflect a portion of the red light, a portion of the green light, and a portion of the blue light, which have passed through the quantum dot thin film layer 207, back to thereby reduce light energy loss.
As shown in fig. 3F, in this embodiment, the light guide device is provided with not only the second reflective sheet 213 but also a third reflective sheet 215 above the second light guide plate 205 and a quantum dot thin film layer 211a below the first light guide plate 203. The third reflective sheet 215 further has a plurality of through holes 217 spaced apart from each other, and the through holes 217 return the blue light emitted from the second light guide plate 205 to the quantum dot thin film layer 211a, so that the light emitting efficiency can be further increased, and the light uniformity can be adjusted.
Fig. 4 is a schematic structural diagram of the first light guide plate in the light guide device of fig. 2, which has a better light-emitting energy ratio.
Referring to fig. 4, in this embodiment, the first light guide plate 203 has a thickness of H1, and the second light guide plate 205 has a thickness of H2. After the blue light emitted from the blue LED light source 201 enters the first light guide plate 203, both the incident angle and the reflection angle are θ1. First of allThe light-emitting end surface of the light guide plate 203 is an inclined surface, and the included angle between the inclined surface and the horizontal plane is theta2. The angle of the light incident on the light-emitting surface of the second light guide plate 205 is represented as θ33. Experiments show that when theta is equal to2When the angle is 90 degrees, the ratio of the light energy on the light-emitting surface of the second light guide plate 205 to the light energy of the blue LED light source is 0; when theta is2At 45 degrees, the light energy of the light-emitting surface of the second light guide plate 205 accounts for 58% of that of the blue LED light source; when theta is2At 30 degrees, the light energy on the light-emitting surface of the second light guide plate 205 accounts for 88% of that of the blue LED light source. In general, the inclination angle θ can be set2Is selected to be between 20 degrees and 45 degrees.
In one embodiment, to avoid the situation that blue light cannot successfully enter the quantum dot film layer to cause light leakage on the display, the longest distance from the light-emitting end surface of the first light guide plate 203 to the quantum dot film layer 207 should be less than the height H2 and tan θ of the second light guide plate 2051A product of where θ1Is the critical angle of total reflection of the first light guide plate. Similarly, the angle θ of the light incident on the light-emitting surface of the second light guide plate 20533And may be greater than 40 degrees.
Fig. 5 is a schematic structural diagram of a liquid crystal display device using the light guide device of fig. 2 according to another embodiment of the present invention.
Referring to fig. 5, in this embodiment, the lcd apparatus includes an lcd panel 305, an optical film layer 303, and a light guide device. The optical film layer 303 is located below the liquid crystal panel 305, and the light guide device is located below the optical film layer 303. As mentioned above, the light-emitting surface of the second light guide plate 205 in the light guide device can emit uniform white light to satisfy the backlight requirement of the liquid crystal molecules in the liquid crystal panel.
Fig. 6 is a schematic structural diagram of a liquid crystal display device using the light guide device of fig. 2 according to still another embodiment of the present invention.
Referring to fig. 6, similarly to fig. 5, in this embodiment, the lcd apparatus includes an lcd panel 305, an optical film layer 303, a diffuser plate 307 and a light guide device. The optical film layer 303 is located below the liquid crystal panel 305, and the diffusion plate 307 is located below the optical film layer 303. The light guide device is located below the diffusion plate 307. Unlike fig. 5, a third reflective sheet 217 is disposed above the second light guide plate. The third reflective sheet 215 further has a plurality of through holes 217 spaced apart from each other, and the through holes 217 return a portion of the blue light emitted from the second light guide plate to the bottom edge of the quantum dot thin film layer 207a, so that the light emitting efficiency can be increased and the light uniformity can be adjusted.
The light guide device with high color saturation comprises a blue LED light source, a first light guide plate, a second light guide plate, a quantum dot film layer and a first reflector plate, wherein the first light guide plate is arranged on the side face of the blue LED light source and used for transmitting light emitted by the blue LED light source to the opposite side far away from the blue LED light source, the second light guide plate is arranged above the first light guide plate, the quantum dot film layer is arranged on the side far away from the blue LED light source of the second light guide plate, the quantum dot film layer converts blue light from the light emitting end face of the first light guide plate into white light, and the first reflector plate is positioned below the first light guide plate so as to reflect part of the blue light back to the inside of the first light guide plate. Compared with the prior art, the LED light source structure adopts the structural design of double light guide plates, blue light is transmitted to the other side far away from the LED light source through the first light guide plate and is incident to the quantum dot thin film layer on the side face of the second light guide plate from the light-emitting end face of the first light guide plate, and the blue light is converted into white light by the quantum dot thin film layer and then is guided into the second light guide plate, so that the light is uniformly emitted in the whole face. Therefore, the quantum dot thin film layer is arranged on one side far away from the LED light source, the using area of the quantum dot thin film layer can be further reduced, and the cost is further reduced.
Hereinbefore, specific embodiments of the present invention are described with reference to the drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present invention without departing from the spirit and scope of the invention. Such modifications and substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (10)
1. A light guide device with high color saturation, comprising:
a blue LED light source;
the first light guide plate is arranged on the side face of the blue LED light source and used for transmitting the light emitted by the blue LED light source to the opposite side far away from the blue LED light source;
the second light guide plate is arranged above the first light guide plate;
the quantum dot thin film layer is arranged on one side, far away from the blue LED light source, of the second light guide plate and used for converting blue light from the light-emitting end face of the first light guide plate into white light; and
and the first reflector plate is positioned below the first light guide plate and used for reflecting part of blue light emitted by the first light guide plate back to the inside of the first light guide plate.
2. The light guide device with high color saturation according to claim 1, wherein a part of blue light emitted from the first light guide plate is reflected by the surface of the quantum dot thin film layer, and another part of blue light is converted into red light and green light by the quantum dot thin film layer, and the quantum dot thin film layer is configured to mix the reflected blue light, the converted red light and the green light to generate the white light.
3. A light guide device with high color saturation according to claim 1, wherein the first light guide plate or the second light guide plate is formed by splicing a plurality of light guide plates.
4. The light guide device with high color saturation according to claim 1, further comprising a second reflector disposed on a side of the quantum dot thin film layer away from the second light guide plate, wherein the second reflector is configured to reflect a portion of the red light, a portion of the green light, and a portion of the blue light penetrating through the quantum dot thin film layer back to reduce light energy loss.
5. The light guide device with high color saturation according to claim 1, further comprising a third reflector disposed above the second light guide plate, wherein the third reflector has a plurality of through holes spaced apart from each other, and the blue light emitted from the second light guide plate is redirected back to the quantum dot film layer through the through holes.
6. The light guide device with high color saturation according to claim 1, wherein the light exit end surface of the first light guide plate is an inclined surface facing the second light guide plate, and the inclined angle is 20-45 degrees.
7. The light guide device with high color saturation according to claim 6, wherein the longest distance from the light exit end surface of the first light guide plate to the quantum dot film layer is less than the height of the second light guide plate and tan θ1A product of where θ1Is the critical angle of total reflection of the first light guide plate.
8. A light guide device with high color saturation according to claim 6, wherein the light exit end face of the first light guide plate is a triangular groove or a rounded groove.
9. A light guide device with high color saturation according to claim 1, wherein the first light guide plate and the second light guide plate are made of polyethylene terephthalate, polycarbonate or polymethyl methacrylate.
10. A light guide device with high color saturation according to claim 1, wherein the light guide device is used as a side-in backlight module or a direct-in backlight source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510777523.1A CN105242457A (en) | 2015-11-13 | 2015-11-13 | Light guide device with high color saturation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510777523.1A CN105242457A (en) | 2015-11-13 | 2015-11-13 | Light guide device with high color saturation |
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| CN105242457A true CN105242457A (en) | 2016-01-13 |
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| CN201510777523.1A Pending CN105242457A (en) | 2015-11-13 | 2015-11-13 | Light guide device with high color saturation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106784236A (en) * | 2016-11-22 | 2017-05-31 | 深圳市华星光电技术有限公司 | LED source and its manufacture method, display panel |
| CN107340647A (en) * | 2017-09-01 | 2017-11-10 | 青岛海信电器股份有限公司 | A kind of method for solving the backlight module edge colour cast using fluorescent film |
| WO2017193418A1 (en) * | 2016-05-09 | 2017-11-16 | 武汉华星光电技术有限公司 | Quantum dot backlight module |
| WO2017206515A1 (en) * | 2016-06-03 | 2017-12-07 | 京东方科技集团股份有限公司 | Backlight source, and manufacturing method, use and display device thereof |
| CN107688255A (en) * | 2017-09-11 | 2018-02-13 | 深圳市华星光电技术有限公司 | A kind of backlight module, quantum dot diaphragm and preparation method thereof |
| US20220187656A1 (en) * | 2020-06-23 | 2022-06-16 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Backlight and display apparatus |
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2015
- 2015-11-13 CN CN201510777523.1A patent/CN105242457A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017193418A1 (en) * | 2016-05-09 | 2017-11-16 | 武汉华星光电技术有限公司 | Quantum dot backlight module |
| WO2017206515A1 (en) * | 2016-06-03 | 2017-12-07 | 京东方科技集团股份有限公司 | Backlight source, and manufacturing method, use and display device thereof |
| US10539735B2 (en) | 2016-06-03 | 2020-01-21 | Boe Technology Group Co., Ltd. | Backlight source, method for producing the same and use of the same, display device |
| CN106784236A (en) * | 2016-11-22 | 2017-05-31 | 深圳市华星光电技术有限公司 | LED source and its manufacture method, display panel |
| CN107340647A (en) * | 2017-09-01 | 2017-11-10 | 青岛海信电器股份有限公司 | A kind of method for solving the backlight module edge colour cast using fluorescent film |
| CN107688255A (en) * | 2017-09-11 | 2018-02-13 | 深圳市华星光电技术有限公司 | A kind of backlight module, quantum dot diaphragm and preparation method thereof |
| US20220187656A1 (en) * | 2020-06-23 | 2022-06-16 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Backlight and display apparatus |
| US11668971B2 (en) * | 2020-06-23 | 2023-06-06 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Backlight and display apparatus |
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