KR20170099570A - Light guide panel, backlight unit having the same and eletronic device having the same - Google Patents
Light guide panel, backlight unit having the same and eletronic device having the same Download PDFInfo
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- KR20170099570A KR20170099570A KR1020160021814A KR20160021814A KR20170099570A KR 20170099570 A KR20170099570 A KR 20170099570A KR 1020160021814 A KR1020160021814 A KR 1020160021814A KR 20160021814 A KR20160021814 A KR 20160021814A KR 20170099570 A KR20170099570 A KR 20170099570A
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- South Korea
- Prior art keywords
- light
- guide plate
- scattering
- scattering particles
- light guide
- Prior art date
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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
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
- G02F1/133516—Methods for their manufacture, e.g. printing, electro-deposition or photolithography
-
- 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
-
- 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
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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)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
The present invention relates to a light guide plate for guiding light generated from a light source to a display panel, a backlight unit including the light guide plate, and an electronic apparatus including the same.
Electronic devices having displays such as TVs, monitors, smart phones, tablet PCs, smart watches, and the like can be used in various fields such as LCD (Liquid Crystal Display) panel, LED (Light Emission Display) panel, OLED (Organic Light Emission Display) Panel, a CRT (Cathode Ray Tube) panel, and the like.
Among these, a display panel that can not emit light by itself, such as an LCD panel or an LED panel, needs a light source for supplying light.
The light guide plate is a component of a backlight unit that supplies light to the display panel, and guides the light supplied from the light source to the transparent plate to uniformly spread the light on the front plate.
In recent years, efforts have been made to reduce the thickness of components in order to realize slimming of electronic devices. When the light guide plate, which is a component of the backlight unit, is thinned, the incident light is guided by a large amount of reflection, and due to the difference in total reflection angle depending on the wavelength, the light of a long wavelength is first emitted and the light of a short wavelength is emitted toward the light- . ≪ / RTI > Thus, the emitted light may be yellowish or reddish.
The present invention provides a light guide plate, a backlight unit including the light guide plate, and an electronic apparatus including the light guide plate, which can prevent yellowing or redening of light emitted by scattering light in a short wavelength band by dispersing nanoparticles on a light guide plate.
An incidence surface to be incident; A facing surface facing the light incidence surface; A reflection surface that is perpendicular to the light incidence surface and the light reflection surface and reflects the incident light; A light exiting surface facing the reflective surface and from which the incident light is emitted; And scattering particles dispersed inside the light-entering surface, the light-receiving surface, the reflection surface, and the light-outgoing surface, and scattering the incident light.
The scattering particles may include nanoparticles causing Rayleigh scattering.
The light guide plate may include an ultraviolet ray hardening resin.
The scattering particles may have a diameter of 5 nm or more and 100 nm or less.
The scattering particles can scatter light in the blue wavelength band.
The scattering particles may be dispersed at a concentration of 5% or more and 30% or less.
The ultraviolet curable resin may be at least one selected from the group consisting of an epoxy acrylate resin, a polyester acrylate resin, a urethane acrylate resin, a polybutadiene acrylate resin, Based resin, a silicon acrylate-based resin, and an alkyl acrylate-based resin.
A backlight unit according to an exemplary embodiment includes a light source; And a light guide plate guiding the light generated from the light source, wherein the light guide plate includes scattering particles scattered in the light source and scattering light incident from the light source.
The scattering particles may include nanoparticles causing Rayleigh scattering.
The light guide plate may include an ultraviolet ray hardening resin.
The scattering particles may have a diameter of 5 nm or more and 100 nm or less.
The scattering particles can scatter light in the blue wavelength band.
The scattering particles may be dispersed at a concentration of 5% or more and 30% or less.
The ultraviolet curable resin may be at least one selected from the group consisting of an epoxy acrylate resin, a polyester acrylate resin, a urethane acrylate resin, a polybutadiene acrylate resin, Based resin, a silicon acrylate-based resin, and an alkyl acrylate-based resin.
An electronic apparatus according to an embodiment includes a display panel; And a backlight unit for supplying light to the display panel, wherein the backlight unit includes: a light source for generating light; And a light guide plate guiding the generated light and scattering particles scattering light incident from the light source.
The scattering particles may include nanoparticles causing Rayleigh scattering.
The light guide plate may include an ultraviolet ray hardening resin.
The scattering particles may have a diameter of 5 nm or more and 100 nm or less.
The scattering particles can scatter light in the blue wavelength band.
The scattering particles may be dispersed at a concentration of 5% or more and 30% or less.
According to the light guide plate, the backlight unit including the light guide plate, and the electronic apparatus including the light guide plate according to the embodiment of the present invention, nanoparticles are dispersed in the light guide plate to effectively scatter light in a short wavelength band, thereby preventing yellowing or reddening .
FIG. 1 is a view showing the appearance of a smartphone in an example of an electronic device according to an embodiment.
2 is a side view illustrating an internal structure of a display panel included in an electronic device according to an exemplary embodiment.
3 is an exploded perspective view of a backlight unit according to an embodiment of the present invention.
4 is a view for explaining an outgoing light mechanism inside a backlight unit according to an embodiment.
5 is a side view of the light guide plate.
FIGS. 6 and 7 are views showing a path through which light travels inside the light guide plate.
8 is a view for explaining Rayleigh scattering.
9 is a sectional view of a light guide plate in which scattering particles are dispersed.
10 is a graph showing scattering irradiance according to the radius of the scattering particles.
11 is a graph showing the relationship between the size of the scattering particles and the Rayleigh scattering ratio.
12 is a graph showing the relationship between the concentration of the scattering particles and the transmittance.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The electronic device according to one embodiment may be one of electronic devices such as a TV, a monitor, etc., or a portable terminal having a display function such as a smart phone, a tablet PC, a smart watch, and the like. There is no limitation on the kind of the electronic device, and an electronic device according to an embodiment may be an apparatus capable of displaying an image including a display.
FIG. 1 is a view showing an external appearance of a smartphone electronic device in an example of an electronic device according to an embodiment, and FIG. 2 is a side view showing an internal structure of a display panel included in an electronic device according to an embodiment.
Referring to Fig. 1, the
A
In one area of the
The
2, the light L supplied from the
A plurality of gate lines (not shown), a data line (not shown), a switching element (not shown) and a rear electrode 33a may be provided on the rear substrate 32a. The rear electrode 33a may be a pixel electrode And the
A
The gate lines are arranged in the row direction to transmit gate signals, and the data lines are arranged in the column direction to transmit data signals. The back electrode 33a may be connected to the gate line and the data line.
The switching element may be implemented as a thin film transistor (TFT) and is formed at the intersection of the gate line and the data line. The source electrode of the thin film transistor is connected to the data line, the gate electrode of the thin film transistor is connected to the gate line, and the drain electrode of the thin film transistor is connected to the back electrode 33a and the capacitor.
The gate line and the data line may be made of a material such as indium tin oxide (ITO) or indium zinc oxide (IZO).
When a scanning signal is supplied to the gate line, the thin film transistor is turned on to supply a data signal supplied from the data line to the rear electrode 33a.
A
Depending on the arrangement of the liquid crystal, the direction of vibration of the light incident on the
For example, the
FIG. 3 is an exploded perspective view of a backlight unit according to an embodiment of the present invention, and FIG. 4 is a view illustrating an outgoing light mechanism inside a backlight unit according to an exemplary embodiment.
3 and 4, the
The backlight unit can be classified into an edge type BLU in which a light source is disposed on a side of a display panel and a direct type BLU in which a light source is located in a rear of the display panel. In this embodiment, an edge type backlight unit in which the light source is located on the side of the display panel is applied.
For example, the
The
For example, a plurality of convex stripes may be formed on the front surface of the
The convex stripe on the entire surface of the
A part of the light incident into the
As described above, the
The
The
The
The optical member 50 may be disposed on the front surface of the
The optical member 50 may include a
The
The
The light having passed through the
The
In addition, the
The
The
5 is a side view of the light guide plate.
Referring to FIG. 5, the light generated from the
That is, the plane on which the
The light is reflected and emitted through the interior 150 surrounded by the light-entering
As described above, a plurality of scattering patterns are formed on the reflecting
The light incident into the
FIGS. 6 and 7 are views showing a path through which light travels inside the light guide plate.
6 and 7, when the light L generated from the
That is, when the thickness of the
In other words, when the thickness of the
Scattering particles are dispersed in the
Fig. 8 is a view for explaining Rayleigh scattering, and Fig. 9 is a sectional view of a light guide plate in which scattering particles are dispersed.
Rayleigh scattering is a phenomenon in which electromagnetic waves are scattered by particles of a size much smaller than the wavelength, and the short wavelength band is scattered more than the long wavelength band. As shown in Fig. 8, when light L meets particles P having a size smaller than its wavelength, light L is scattered in all directions.
The Rayleigh scattering coefficient (R) can be defined by the following equation (1).
Here,? Represents a proportional constant, c represents a concentration of particles, d represents a size of a particle,? Represents a wavelength of light, and n represents a refractive index.
Referring to Equation (1), the intensity of the Rayleigh scattering is inversely proportional to the fourth power of the wavelength of the light, and the intensity of the scattered light sharply decreases as the wavelength becomes longer. Accordingly, the Rayleigh scattering effectively appears for light in a short wavelength band, so that blue light in a short wavelength band can be more effectively scattered than light in a long wavelength band.
As shown in FIG. 9, scattering
The size and concentration of scattering particles can be optimized to suit the characteristics or design of each electronic device (1). By optimizing the size and concentration of the scattering
FIG. 10 is a graph showing the scattering irradiance according to the radius of the scattering particles, FIG. 11 is a graph showing the relationship between the scattering particle size and the Rayleigh scattering ratio, and FIG. 12 is a graph showing the relationship between the scattering particle concentration and the transmittance Graph. In the graph of FIG. 11, R is an index indicating a Rayleigh scattering ratio.
In consideration of the fact that the
Referring to FIG. 10, it can be seen that when the size of the scattering
In addition, referring to FIG. 11, the scattering
12 is a graph showing the transmittance of each TiO 2 -polymer scattering particle having a concentration of TiO 2 of 0%, 2.7%, 5.3%, 10%, 17.6%, and 30% by wavelength. Here, the concentration may be Vol.% Based on the volume.
Referring to the graph of FIG. 12, it can be seen that when the concentration of TiO 2 is 30% or more, the maximum transmittance is lowered to about 80%, and the maximum transmittance is maintained at about 90 to 100% at a concentration below that. Therefore, the concentration of the scattering
Meanwhile, as described above, the
The monomer or oligomer having a small molecular weight is present in a liquid state, and is converted into a solid state polymer having a very high molecular weight. Since such an ultraviolet curing resin has a low viscosity, scattering
The oligomer used for the ultraviolet curable resin constituting the
When such an oligomer is polymerized by ultraviolet curing to become a polymer, an epoxy acrylate-based resin, a polyester acrylate-based resin, a urethane acrylate-based resin, a polybutadiene acrylate ) Based resin, a silicon acrylate based resin, and an alkyl acrylate based resin.
According to the light guide plate, the backlight unit including the light guide plate, and the electronic apparatus including the light guide plate, scattering particles are dispersed in the light guide plate to efficiently scatter light having a short wavelength such as a blue wavelength band to be emitted, It is possible to solve the problem of uneven outflow caused by the unevenness.
In addition, scattering particles can be effectively dispersed in the light guide plate by manufacturing the light guide plate using an ultraviolet hardening resin having a low viscosity.
1: Electronic device
10: Backlight unit
30: Display panel
50: optical member
100: light guide plate
110: mouth surface
120:
130: exit surface
140: Reflecting surface
150: inside
160: scattering particles
Claims (20)
A light incidence surface on which the generated light is incident;
A facing surface facing the light incidence surface;
A reflection surface that is perpendicular to the light incidence surface and the light reflection surface and reflects the incident light;
A light exiting surface facing the reflective surface and from which the incident light is emitted; And
Scattering particles dispersed inside the light-entering surface, the light-receiving surface, the reflection surface, and the light-outgoing surface, and scattering the incident light.
The scattering particles,
A light guide plate comprising nanoparticles causing Rayleigh scattering.
The light-
A light guide plate comprising an ultraviolet curable resin.
The scattering particles,
A light guide plate having a diameter of 5 nm or more and 100 nm or less.
The scattering particles,
A light guide plate for scattering light in a blue wavelength band.
The scattering particles,
Wherein the light guide plate is dispersed at a concentration of 5% or more and 30% or less.
The ultraviolet-curable resin is a resin-
Epoxy acrylate series resin, polyester acrylate series resin, urethane acrylate series resin, polybutadiene acrylate series resin, silicon acrylate series resin, A resin, and an alkyl acrylate based resin.
And a light guide plate guiding the light generated from the light source,
The light-
And scattering particles scattered inside the light source and scattering light incident from the light source.
The scattering particles,
A backlight unit comprising nanoparticles causing Rayleigh scattering.
The light-
A backlight unit comprising an ultraviolet curable resin.
The scattering particles,
A backlight unit having a diameter of 5 nm or more and 100 nm or less.
The scattering particles,
A backlight unit for scattering light in a blue wavelength band.
The scattering particles,
The backlight unit is dispersed at a concentration of 5% or more and 30% or less.
The ultraviolet-curable resin is a resin-
Epoxy acrylate series resin, polyester acrylate series resin, urethane acrylate series resin, polybutadiene acrylate series resin, silicon acrylate series resin, And at least one of a resin and an alkyl acrylate based resin.
And a backlight unit for supplying light to the display panel,
The backlight unit includes:
A light source for generating light; And
And a light guide plate guiding the generated light and scattering particles scattering light incident from the light source.
The scattering particles,
Electronic devices containing nanoparticles that cause Rayleigh scattering.
The light-
An electronic device comprising an ultraviolet curable resin.
The scattering particles,
An electronic device having a diameter of 5 nm or more and 100 nm or less.
The scattering particles,
An electronic device for scattering light in a blue wavelength band.
The scattering particles,
An electronic device which is dispersed in a concentration of 5% or more and 30% or less.
Priority Applications (1)
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KR1020160021814A KR101895968B1 (en) | 2016-02-24 | 2016-02-24 | Light guide panel, backlight unit having the same and eletronic device having the same |
Applications Claiming Priority (1)
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KR1020160021814A KR101895968B1 (en) | 2016-02-24 | 2016-02-24 | Light guide panel, backlight unit having the same and eletronic device having the same |
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KR1020180072877A Division KR20180072656A (en) | 2018-06-25 | 2018-06-25 | Light guide panel, backlight unit having the same and eletronic device having the same |
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Publication Number | Publication Date |
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KR20170099570A true KR20170099570A (en) | 2017-09-01 |
KR101895968B1 KR101895968B1 (en) | 2018-10-04 |
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KR1020160021814A KR101895968B1 (en) | 2016-02-24 | 2016-02-24 | Light guide panel, backlight unit having the same and eletronic device having the same |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110068948A (en) * | 2019-04-08 | 2019-07-30 | 成都工业学院 | A kind of display device of variable vision area |
JP2020024843A (en) * | 2018-08-07 | 2020-02-13 | 三菱電機株式会社 | Illumination device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006108004A (en) * | 2004-10-07 | 2006-04-20 | Scalar Corp | Light guide plate, manufacturing method of light guide plate, backlight, and liquid crystal display device |
JP5355030B2 (en) * | 2008-04-24 | 2013-11-27 | シチズンホールディングス株式会社 | LED light source and chromaticity adjustment method of LED light source |
JP5959575B2 (en) * | 2014-06-30 | 2016-08-02 | ミネベア株式会社 | Planar illumination device and manufacturing method thereof |
-
2016
- 2016-02-24 KR KR1020160021814A patent/KR101895968B1/en active IP Right Grant
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020024843A (en) * | 2018-08-07 | 2020-02-13 | 三菱電機株式会社 | Illumination device |
CN110068948A (en) * | 2019-04-08 | 2019-07-30 | 成都工业学院 | A kind of display device of variable vision area |
CN110068948B (en) * | 2019-04-08 | 2024-02-13 | 成都工业学院 | Display device with variable visual area |
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KR101895968B1 (en) | 2018-10-04 |
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