KR101786838B1 - Reflective Polarizer And Display Device Including The Same - Google Patents
Reflective Polarizer And Display Device Including The Same Download PDFInfo
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- KR101786838B1 KR101786838B1 KR1020150152648A KR20150152648A KR101786838B1 KR 101786838 B1 KR101786838 B1 KR 101786838B1 KR 1020150152648 A KR1020150152648 A KR 1020150152648A KR 20150152648 A KR20150152648 A KR 20150152648A KR 101786838 B1 KR101786838 B1 KR 101786838B1
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- layer
- pattern
- polarizing plate
- polarizing
- polarized light
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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
- G02F1/133528—Polarisers
- G02F1/133536—Reflective polarizers
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- H01L27/3232—
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- H01L51/5293—
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Electroluminescent Light Sources (AREA)
- Liquid Crystal (AREA)
Abstract
The present invention relates to a polarizing plate comprising a base film and a plurality of polarizing patterns extending in a first direction on the base film and spaced apart from each other in a second direction, . The polarizing degree of the reflection type polarizing plate is increased by adjusting the pitch of the polarizing pattern and the reflection type polarizing plate of the present invention is applied to the liquid crystal display device or the organic light emitting diode display device to improve the brightness of the display device.
Description
The present invention relates to a display device, and more particularly to a reflective polarizer and a display device including the same.
In view of the information age, the display field has also been rapidly developed. As a flat panel display device (FPD) having the advantages of thinning, light weight, and low power consumption in response to the information age, ) And an organic light emitting diode (OLED) display device (OLED) have been developed and widely used.
In the liquid crystal display, images are displayed by using optical anisotropy and dielectric anisotropy of liquid crystal molecules. When an artificial electric field is applied to the liquid crystal in the state that rod-shaped liquid crystal molecules are aligned in one direction, the liquid crystal is rotated by the dielectric anisotropy of the liquid crystal. Therefore, by applying an appropriate voltage to the liquid crystal layer to arbitrarily adjust the arrangement direction of the liquid crystal molecules, the arrangement of the liquid crystal molecules is changed, and the polarized light is modulated by the optical anisotropy of the liquid crystal thereby to display a desired image, A polarizing film is required on the lower side of the liquid crystal display to form light.
Meanwhile, an organic light emitting diode display device, also referred to as an organic electroluminescence display device or organic electroluminescence display device, is a device in which electrons are injected into a light emitting layer formed between a cathode serving as an electron injection electrode and a cathode serving as a hole injection electrode, The exciton formed by the combination of the holes transmits energy to the dopant to emit light, thereby displaying an image.
In principle, an organic light emitting diode display device does not require a polarizing film unlike a liquid crystal display device, but uses a polarizing film to prevent reflection due to a high substrate reflectance.
1 is a view schematically showing a conventional polarizer structure.
As shown in Fig. 1, a conventional polarizing plate 10 includes a polarizing film 12 and first and second supporting films 14 and 16.
The polarizing film 12 is formed by stretching polyvinyl alcohol (PVA) in which iodine ions or dichroic dyes are dyed. The polarizing film 12 is formed by stretching the polarizing film 12 in a direction parallel to the absorption axis The vibrating light is absorbed and selectively transmits only light oscillating in a direction perpendicular to the absorption axis.
Each of the first and second supporting films 14 and 16 is made of triacetyl cellulose (TAC) and attached to the upper and lower surfaces of the polarizing film 12 to protect the polarizing film 12 .
However, this polarizing plate 10 is an absorption type polarizing plate and selectively transmits only light oscillating in a direction perpendicular to the absorption axis, so that the transmittance is smaller than 50%, thereby lowering the brightness of the display device. Particularly, since the liquid crystal display device uses such a polarizing plate 10 on the upper and lower sides of the liquid crystal panel, the luminance of the liquid crystal display device is further lowered.
The degree of polarization of the polarizing plate 10 depends on the degree of alignment of the iodine ion or the dichroic dye. However, since alignment of the iodine ion or the dichroic dye is not easily controlled, there is a limit to increase the degree of polarization.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to solve the problem of luminance reduction of a display device by an absorption type polarizing plate.
Further, the present invention aims to solve the problem of polarization limitation of the absorption type polarizing plate.
According to an aspect of the present invention, there is provided a polarizing plate comprising a base film, and a plurality of polarizing patterns extending in a first direction on the base film and spaced apart from each other in a second direction, And transmits linearly polarized light through the polarizing plate.
That is, in the reflection type polarizing plate of the present invention, linearly polarized light in the second direction is transmitted between adjacent polarized light patterns, each of the polarized light patterns reflects linearly polarized light in the first direction, .
The pitch of the polarizing pattern is 1 nm to 150 nm, and the pitch can be adjusted to increase the degree of polarization of the reflection type polarizing plate.
Meanwhile, the reflective polarizer of the present invention can be applied to a liquid crystal display device or an organic light emitting diode display device.
As described above, the reflection type polarizing plate according to the present invention can increase not only the light passing through the polarizing pattern but also the light passing through the polarizing pattern.
When such a reflective polarizer is applied to a liquid crystal display device and an organic light emitting diode display device, the brightness of the display device can be improved.
On the other hand, it is possible to increase the degree of polarization of the reflection type polarizing plate by adjusting the pitch of the polarizing pattern, thereby increasing the contrast ratio of the liquid crystal display.
In addition, a reflection type polarizing plate may be applied to reflect external light to be used as a mirror type display device.
1 is a view schematically showing a conventional polarizer structure.
2 is a cross-sectional view schematically showing a reflection type polarizing plate according to an embodiment of the present invention.
3 is a view schematically showing transmission and reflection of light in a reflection type polarizing plate according to an embodiment of the present invention.
FIGS. 4A to 4D are schematic views illustrating a process of manufacturing a reflective polarizer according to an exemplary embodiment of the present invention.
5 is a cross-sectional view schematically showing a reflection type polarizing plate according to another embodiment of the present invention.
6 is a schematic view illustrating a process of manufacturing a reflective polarizer according to another embodiment of the present invention.
7 is a cross-sectional view schematically showing a liquid crystal display device including a reflection type polarizing plate according to the first embodiment of the present invention.
8 is a cross-sectional view schematically showing a display panel of a liquid crystal display device including a reflection type polarizing plate according to the first embodiment of the present invention.
9 is a cross-sectional view schematically showing a liquid crystal display device including a reflection type polarizing plate according to a second embodiment of the present invention.
10 is a cross-sectional view schematically showing an organic light emitting diode display device including a reflection type polarizing plate according to a third embodiment of the present invention.
11 is a cross-sectional view schematically illustrating a display panel of an organic light emitting diode display device including a reflection type polarizing plate according to a third embodiment of the present invention.
The reflection type polarizing plate of the present invention comprises a base film and a plurality of polarization patterns extending in a first direction on the base film and spaced apart in a second direction, and linearly polarized light in the second direction between adjacent polarization patterns And each of the polarization patterns reflects linearly polarized light in the first direction and transmits linearly polarized light in the second direction.
Each of the polarization patterns includes at least one first pattern layer and at least one second pattern layer, and the refractive index of the first pattern layer is different from the refractive index of the second pattern layer.
Wherein a refractive index of the first pattern layer in the first direction is different from a refractive index of the second pattern layer in the first direction and a refractive index of the first pattern layer in the second direction is different from a refractive index of the second pattern layer in the second direction, Direction.
The pitch of the polarizing pattern is 1 nm to 150 nm.
The reflective polarizer of the present invention further comprises a polymer nanopattern between the base film and the polarizing pattern.
On the other hand, the display device of the present invention includes a display panel and a reflection type polarizing plate having the above-mentioned configuration on one side of the display panel.
The display device of the present invention further includes an absorption type polarizing plate on the other side of the display panel, wherein the display panel includes a liquid crystal layer between the first and second substrates and the first and second substrates, Is parallel to the second direction.
Alternatively, the display device of the present invention may further include a sine wave plate between the display panel and the reflective polarizer, and an absorptive polarizer on the outer side of the reflective polarizer, wherein the display panel includes first and second electrodes, And an organic light emitting layer between the first and second electrodes, wherein the absorption axis of the absorption type polarizing plate is parallel to the first direction.
Hereinafter, embodiments of the present invention capable of solving the conventional problems will be described in detail with reference to the drawings.
2 is a cross-sectional view schematically showing a reflection type polarizing plate according to an embodiment of the present invention.
2, the reflective polarizer according to an exemplary embodiment of the present invention includes a
The
A plurality of
The
A
The
The
The width of the
The distance between the centers of the adjacent two
3 is a view schematically showing transmission and reflection of light in a reflection type polarizing plate according to an embodiment of the present invention.
Light L1 vibrating in a direction perpendicular to the
The light L2 that vibrates in a second direction having the same refractive index as that of the
As described above, the reflection type polarizing plate according to the embodiment of the present invention can increase the transmittance by the light L2 transmitted through the
In addition, it is possible to increase the degree of polarization of the reflection type polarizing plate by adjusting the pitch (P1 in Fig. 2) of the
A method of manufacturing a reflection type polarizing plate according to an embodiment of the present invention will be described with reference to FIGS. 4A to 4D.
FIGS. 4A to 4D are schematic views illustrating a process of manufacturing a reflective polarizer according to an exemplary embodiment of the present invention.
4A, a polymer solution is coated on the
The
Next, an
Next, as shown in Fig. 4B, by moving the embossing drum (150 in Fig. 4A) against the polymer layer (120a in Fig. 4A) in one direction, for example, from right to left in the drawing, A plurality of
Next, the
Next, as shown in FIG. 4C, the reflective
The refractive index of the
Next, a photosensitive layer 140 is formed by applying photoresist on the reflective
Next, as shown in FIG. 4D, the
On the other hand, a protective layer (not shown) may be further formed on the
In the reflection type polarizing plate according to the embodiment of the present invention, a
5 is a cross-sectional view schematically showing a reflection type polarizing plate according to another embodiment of the present invention.
5, the reflective polarizer according to another embodiment of the present invention includes a
The
A plurality of
The
The
The distance between the centers of the adjacent two
The transmission and reflection of light in the reflection type polarizing plate according to another embodiment of the present invention are the same as those of the reflection type polarizing plate shown in FIG.
Accordingly, the reflection type polarizing plate according to another embodiment of the present invention can increase not only the light transmitted between the
In addition, it is possible to increase the degree of polarization of the reflection type polarizing plate by adjusting the pitch P2 of the
A method of manufacturing a reflection type polarizing plate according to another embodiment of the present invention will be described with reference to FIG.
6 is a schematic view illustrating a process of manufacturing a reflective polarizer according to another embodiment of the present invention.
6, a
An
Next, the
1st Example
FIG. 7 is a cross-sectional view schematically showing a liquid crystal display device including a reflective polarizer according to the first embodiment of the present invention. FIG. 8 is a schematic view of a liquid crystal display device including a reflective polarizer according to the first embodiment of the present invention. Sectional view schematically showing a display panel of one pixel region.
7, the liquid crystal display according to the first embodiment of the present invention includes a
Referring to FIG. 8, the
A gate wiring (not shown) and a
A
A
Source and
The
The thin film transistor T has an inverted staggered structure in which the
Alternatively, the thin film transistor may have a coplanar structure in which the gate electrode and the source and drain electrodes are located on one side of the semiconductor layer, that is, on the upper side of the semiconductor layer. In this case, the semiconductor layer may be made of polycrystalline silicon, and impurities may be doped on both sides of the semiconductor layer.
On the other hand, the semiconductor layer may be made of an oxide semiconductor, and in the case of an inversely staggered structure, the ohmic contact layer may be omitted.
Further, a data line (not shown) is formed of the same material in the same layer as the source and drain
A
An inorganic insulating layer made of an inorganic insulating material such as silicon oxide (SiO 2 ) or silicon nitride (SiNx) may be further formed under the
A
Here, common wiring (not shown) parallel to the gate wiring may be formed of the same material in the same layer as the gate wiring. At this time, the
Alternatively, the
A
Such a
Meanwhile, the
A
Here, the structure in which the
Such a color filter-on-array structure can increase the aperture ratio by reducing the cohesion margin of the first and
Under the
A
This
A
Referring again to FIG. 7, a first
The first
On the other hand, a second
The second
The second
The polarizing layer 372 may be made of polyvinyl alcohol (PVA), and each of the first and second
The second
The second
The liquid crystal display according to the first embodiment of the present invention can increase the brightness of a liquid crystal display by using a reflective polarizer having a relatively high transmissivity as a lower polarizer. At this time, the light utilization efficiency can be increased through the recycling effect of light by the reflection type polarizing plate.
In addition, the contrast ratio of the liquid crystal display device can be increased by adjusting the pitch of the polarizing pattern to increase the degree of polarization of the reflection-type polarizing plate. Here, the contrast ratio can be increased up to 50%.
Second Example
9 is a cross-sectional view schematically showing a liquid crystal display device including a reflection type polarizing plate according to a second embodiment of the present invention.
9, the liquid crystal display according to the second embodiment of the present invention includes a liquid crystal panel 410 as a display panel, a
A first
The first
On the other hand, a second
The second
The second
The
The second
The second
The liquid crystal display according to the second embodiment of the present invention can increase the brightness of a liquid crystal display device by using a reflection type polarizing plate having a relatively large transmissivity as an upper polarizing plate and can reflect the external light to be used as a mirror type display device .
In addition, the contrast ratio of the liquid crystal display device can be increased by adjusting the pitch of the polarizing pattern to increase the degree of polarization of the reflection-type polarizing plate.
In the first and second embodiments, the reflection type polarizing plate of the present invention is disposed on one side of the liquid crystal panel, but the reflection type polarizing plate of the present invention may be disposed on both sides of the liquid crystal panel.
Third Example
FIG. 10 is a cross-sectional view schematically showing an organic light emitting diode display device including a reflection type polarizing plate according to a third embodiment of the present invention. FIG. 11 is a cross- Sectional view schematically showing a display panel of a light emitting diode display device, and shows one pixel region.
10, the organic light emitting diode display according to the third embodiment of the present invention includes a
The
Referring to FIG. 11, in the organic light emitting
A
A
In the third embodiment of the present invention, the
An interlayer insulating
The
Source and
The source and drain
At this time, a power wiring (not shown) may be further formed on the
On the other hand, the
Alternatively, the thin film transistor may have an inverted staggered structure in which a gate electrode is positioned below the semiconductor layer and source and drain electrodes are located above the semiconductor layer. In this case, the semiconductor layer may be made of amorphous silicon.
Here, the thin film transistor corresponds to a driving thin film transistor of the organic light emitting
A
The
A
On the
A light-emitting
A
The
The
An
The
The
Alternatively, the
Here, the organic light emitting
Alternatively, the organic light emitting
Referring again to FIG. 10, the
The first
The second
In this organic light emitting diode display device, of the light emitted from the
As described above, the organic light emitting diode display device according to the third embodiment of the present invention can increase the brightness of the organic light emitting diode display device by applying the reflection type polarizing plate having a relatively high transmittance as the brightness enhancement film.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that
110, 210: Base film 120: Nanopattern
130, 230:
134, 234: second pattern layer P1, P2: pitch
310, 410:
370, 470: a second polarizer plate
Claims (12)
A plurality of polarizing patterns extending in the first direction and spaced apart in the second direction on the base film,
/ RTI >
And transmits the first linearly polarized light in the second direction between adjacent polarization patterns,
Wherein each of the polarizing patterns reflects the linearly polarized light in the first direction and transmits the second linearly polarized light in the second direction.
Wherein each of the polarization patterns includes at least one first pattern layer and at least one second pattern layer,
And the refractive index of the first pattern layer is different from the refractive index of the second pattern layer.
Wherein a refractive index of the first pattern layer in the first direction is different from a refractive index of the second pattern layer in the first direction and a refractive index of the first pattern layer in the second direction is different from a refractive index of the second pattern layer in the second direction, Directional refractive index.
And the pitch of the polarizing pattern is 1 nm to 150 nm.
And a nano pattern between the base film and the polarizing pattern.
The nano pattern is made of any one of polymethyl methacrylate (PMMA), polycarbonate (PC), and polyethylene terephthalate (PET).
Wherein the polarizing pattern is equal to or larger than an upper surface width of the nano pattern.
Wherein the polarizing pattern is smaller than or equal to a lower width of the nano pattern.
A reflective polarizer according to any one of claims 1 to 8,
.
Further comprising an absorption type polarizing plate on the other side of the display panel,
Wherein the display panel includes a liquid crystal layer between the first and second substrates and the first and second substrates,
And the absorption axis of the absorption type polarizing plate is parallel to the second direction.
A quarter wave plate between the display panel and the reflective polarizer;
Further comprising an absorption type polarizing plate on the outer side of the reflection type polarizing plate,
Wherein the display panel includes an organic light emitting layer between the first and second electrodes and the first and second electrodes,
And an absorption axis of the absorption type polarizing plate is parallel to the first direction.
A plurality of polarizing patterns extending in the first direction and spaced apart in the second direction on the base film,
/ RTI >
Reflects linearly polarized light in the first direction and transmits linearly polarized light in the second direction,
Wherein the linearly polarized light in the second direction includes a first linearly polarized light transmitted between the polarized light patterns and a second linearly polarized light transmitted through each of the polarized light patterns.
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KR102579090B1 (en) * | 2020-12-28 | 2023-09-15 | (주)화인솔루션 | Ion Beam Sputtering Apparatus for Manufacturing a Wire Grid Polarizer |
KR102579089B1 (en) * | 2020-12-28 | 2023-09-15 | (주)화인솔루션 | Method for Manufacturing a Wire Grid Polarizer Using Ion Beam Sputtering Device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2011512558A (en) * | 2008-05-22 | 2011-04-21 | エルジー・ケム・リミテッド | Brightness improving polarizing plate for organic light emitting devices |
JP2015108845A (en) * | 2015-02-09 | 2015-06-11 | デクセリアルズ株式会社 | Polarizing element |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2011512558A (en) * | 2008-05-22 | 2011-04-21 | エルジー・ケム・リミテッド | Brightness improving polarizing plate for organic light emitting devices |
JP2015108845A (en) * | 2015-02-09 | 2015-06-11 | デクセリアルズ株式会社 | Polarizing element |
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