CN113985673B - Display device - Google Patents
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- CN113985673B CN113985673B CN202111368099.7A CN202111368099A CN113985673B CN 113985673 B CN113985673 B CN 113985673B CN 202111368099 A CN202111368099 A CN 202111368099A CN 113985673 B CN113985673 B CN 113985673B
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- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 claims abstract description 43
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 238000010521 absorption reaction Methods 0.000 claims abstract description 23
- 239000004973 liquid crystal related substance Substances 0.000 claims description 22
- 238000005538 encapsulation Methods 0.000 claims description 17
- 239000002131 composite material Substances 0.000 description 32
- 229920000642 polymer Polymers 0.000 description 27
- 239000000463 material Substances 0.000 description 18
- 238000002834 transmittance Methods 0.000 description 18
- 230000000903 blocking effect Effects 0.000 description 10
- 238000004806 packaging method and process Methods 0.000 description 9
- 230000010287 polarization Effects 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000003098 cholesteric effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
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- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
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- 230000005525 hole transport Effects 0.000 description 4
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- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
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- 238000012546 transfer Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
-
- 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
- G02F1/133543—Cholesteric polarisers
-
- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/868—Arrangements for polarized light emission
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Polarising Elements (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The embodiment of the invention discloses a display device. In one embodiment, the display device includes: the display device comprises a display panel, and a cholesteric liquid crystal film, a quarter wave plate and a polaroid which are sequentially arranged on the light emitting side of the display panel, wherein the cholesteric liquid crystal film is used for transmitting one of left circularly polarized light and right circularly polarized light of red light wavelength, green light wavelength and blue light wavelength and reflecting the other; an included angle between an optical axis of the quarter wave plate and an absorption axis of the polarizer is set such that the polarizer transmits circularly polarized light passing through the quarter wave plate. The embodiment can improve the light emitting efficiency of the display panel and reduce the power consumption of the display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
At present, in order to improve the reflection of the display panel (reflect the ambient light to the human eye), a quarter wave plate and a polarizer are sequentially arranged at the light emitting side of the display panel, at this time, the natural light (i.e. unpolarized light) emitted from the display panel is still natural light after passing through the quarter wave plate, the natural light passes through the polarizer, the light with the vibration direction parallel to the transmission axis of the polarizer is transmitted, the light with the vibration direction parallel to the absorption axis of the polarizer is absorbed by the polarizer, the light transmittance emitted from the display panel is less than 50% (about 30%), the light emitting efficiency of the display panel is lower, and the power consumption is increased.
Disclosure of Invention
The present invention is directed to a display device that solves at least one of the problems of the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a display device, which comprises a display panel, and a cholesteric liquid crystal film, a quarter wave plate and a polaroid which are sequentially arranged on the light emitting side of the display panel, wherein the cholesteric liquid crystal film is used for transmitting one of left-handed circularly polarized light and right-handed circularly polarized light with red wavelength, green wavelength and blue wavelength and reflecting the other; an included angle between an optical axis of the quarter wave plate and an absorption axis of the polarizer is set such that the polarizer transmits circularly polarized light passing through the quarter wave plate.
Optionally, the pitch of the liquid crystal molecules of the cholesteric liquid crystal film comprises a first pitch corresponding to a reflection wavelength of red light, a second pitch corresponding to a reflection wavelength of green light and a third pitch corresponding to a reflection wavelength of blue light, wherein the overall ratio of the second pitch is greater than 50%.
Optionally, the overall ratio of the second pitch is 70% -80%.
Alternatively, the cholesteric liquid crystal film has a thickness of 5 μm to 20 μm.
Optionally, the cholesteric liquid crystal film is used for transmitting left circularly polarized light with red light wavelength, green light wavelength and blue light wavelength and reflecting right circularly polarized light; and an included angle of 45 degrees is formed between the optical axis of the quarter wave plate and the absorption axis of the polaroid.
Optionally, the cholesteric liquid crystal film is used for transmitting right-handed circularly polarized light with red light wavelength, green light wavelength and blue light wavelength and reflecting left-handed circularly polarized light; and an included angle of 135 degrees is formed between the optical axis of the quarter wave plate and the absorption axis of the polaroid.
Optionally, the display device further includes a half-wave plate disposed between the quarter-wave plate and the polarizer.
Optionally, the display device further comprises a connection layer disposed between the display panel and the cholesteric liquid crystal film.
Optionally, the thickness of the connection layer is greater than the thickness of the cholesteric liquid crystal film.
Optionally, the display panel includes an encapsulation layer located at the light emitting side, and a refractive index difference between the connection layer and the encapsulation layer is greater than or equal to a preset value.
Optionally, the display panel is an organic light emitting diode display panel.
The beneficial effects of the invention are as follows:
according to the technical scheme, the cholesteric liquid crystal film is arranged between the light emitting side of the display panel and the quarter wave plate and is used for transmitting one of left-handed circularly polarized light and right-handed circularly polarized light with red light wavelength, green light wavelength and blue light wavelength and reflecting the other; the included angle between the optical axis of the quarter wave plate and the absorption axis of the polaroid is set to enable the polaroid to transmit circularly polarized light passing through the quarter wave plate, so that the light transmittance of the display device can be improved, the display effect is improved, and the power consumption of the display panel is reduced.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Fig. 1 is a schematic diagram showing the principle of the optical path of a conventional display device.
Fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an optical path of a display device according to an embodiment of the present invention.
Fig. 4 shows a first pitch schematic.
Fig. 5 shows a second pitch schematic.
Fig. 6 shows a third pitch schematic.
Fig. 7 is a schematic diagram showing a relationship between reflection wavelength and transmittance of red, green and blue light of a polymer composite film according to an embodiment of the present invention.
Fig. 8 shows a comparison of power consumption by three examples provided by embodiments of the present invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to examples and drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
In order to avoid that ambient light is reflected to enter human eyes, a quarter wave plate and a polaroid are sequentially laminated on a display Panel, external ambient light passes through a linear polaroid with an absorption axis being vertical, light passing through the absorption axis being horizontal, namely light in the horizontal direction can pass through the linear polaroid, light in the vertical direction is absorbed, namely unpolarized light is changed into incident linear polarized light in the horizontal direction, light continues to advance, light passes through the quarter wave plate, light is changed into left-hand circularly polarized light from the incident linear polarized light in the horizontal direction, light continues to advance to a reflecting plate at the next layer of the quarter wave plate, the light is rotated by 180 degrees and is emitted back to become right-hand circularly polarized light, light becomes reflected linear polarized light after passing through the quarter wave plate again, but the reflected linear polarized light direction of the time is perpendicular to the incident linear polarized light direction of the first passing through the quarter wave plate, namely the vertical direction, and the linear polarized light in the vertical direction is parallel to the absorption axis of the polaroid, so that the light is absorbed by the polaroid and cannot be transmitted to the surface of the display Panel (Panel).
But at the same time, the efficiency of the light emitted by the display panel is greatly reduced, and the intensity of the emitted light originally set by the display panel can be maintained only by increasing higher power consumption, specifically: as shown in fig. 1, after the light emitted from the display panel 1 passes through the quarter wave plate 2, no light in any vibration direction is absorbed, the light continues to advance, the light passing through the polarizer 3, the light in the vibration direction perpendicular to the absorption axis of the polarizer 3, for example, the vertical direction, can pass through, the parallel light is absorbed, that is, the unpolarized light is converted into the linearly polarized light emitted in the horizontal direction, at this time, the light emitted from the panel is converted into the light which is only perpendicular to the absorption axis, that is, the light emitted from the display panel is less than 50% of the light emitted from the display panel, about 30% of the light emitted from the display panel is visible to the human eye, and if the human eye wants to see the originally set intensity of the light of the display panel, the display brightness must be increased at the cost of higher power consumption to improve the light emitted from the display panel.
In view of the above, an embodiment of the present invention provides a display device, including a display panel, and a cholesteric liquid crystal film, a quarter-wave plate, and a polarizer sequentially disposed on an light-emitting side of the display panel, where the cholesteric liquid crystal film is configured to transmit one of left-handed circularly polarized light and right-handed circularly polarized light of red wavelength, green wavelength, and blue wavelength, and reflect the other; the angle between the optical axis of the quarter wave plate (which may also be called the phase axis) and the absorption axis of the polarizer is set such that the polarizer transmits circularly polarized light through the quarter wave plate.
In one specific example, as shown in fig. 2, the display device includes a display panel 10 such as an OLED display panel, a cholesteric liquid crystal film 40 disposed at an light emitting side of the display panel 10, a quarter wave plate 50, and a polarizer 70, wherein the display panel 10 includes, for example, an anode 100, a Hole Injection Layer (HIL) 101, a Hole Transport Layer (HTL) 102, an Electron Blocking Layer (EBL) 103, an emission layer (EML) 104, a Hole Blocking Layer (HBL) 105, an Electron Transport Layer (ETL) 106, an Electron Injection Layer (EIL) 107, and a cathode 108.
The anode 100 is a high work function electrode material such as transparent oxide of ITO, IZO, or the like, or a composite electrode formed of Ag/ITO, ag/IZO, CNT/ITO, CNT/IZO, GO/ITO, GO/IZO, or the like.
The hole injection layer 101 may be HATCN, mnO 3 The hole injection layer may be formed by co-evaporation of the hole transport material by P-type doping with a layer thickness of 5 to 20 nm.
The material of the hole transport layer 102 is a material having good hole transport characteristics.
An Electron Blocking Layer (EBL) 103 includes a blue exciton blocking layer, a red exciton blocking layer, and a green exciton blocking layer, wherein the thickness of the blue exciton blocking layer is 1 to 10nm, and functions mainly to transfer holes, block electrons, and excitons generated in the light emitting layer; the thickness of the red light exciton blocking layer is regulated between 40 and 60nm; the green exciton blocking layer thickness was adjusted between 15-30 nm.
The material of the light emitting layer (EML) 104 is an organic material, including a blue light emitting layer, a red light emitting layer, and a green light emitting layer, wherein the thickness of the blue light emitting layer is adjusted between 15-25 nm; the thickness of the red light emitting layer is regulated between 25 and 40 nm; the thickness of the green light emitting layer is adjusted between 25 and 40 nm.
The Hole Blocking Layer (HBL) 105 has a thickness in the range of 2 to 10nm and serves mainly to transfer electrons and block holes.
The material of the Electron Transport Layer (ETL) 106 is a material having good electron transport characteristics.
The Electron Injection Layer (EIL) 107 can be prepared by vapor deposition of LiF, liQ, yb, ca, etc. materials of 0.5nm to 2 nm.
The cathode 108 may be prepared by vapor deposition of 10nm to 20nm Mg, ag, al films, or may be prepared using alloys such as Mg: ag, preferably Mg: ag in a ratio of 3: 7-1: 9, adjusting the transmittance of the metal film layer at 530nm to be 50% -60%, so as to form a semitransparent cathode; transparent cathode can also be prepared by transparent oxide ITO, IZO, IGZO and other materials.
The cholesteric liquid crystal film 40 is a polymer composite film material, and the film material comprises a liquid crystal monomer and a chiral additive, and the chiral additive can be added into liquid crystal molecules to enable the alignment of the liquid crystal molecules to be twisted, so that the liquid crystal molecules with a certain pitch and in a cholesteric phase are formed. In this example, the doping mass percentage of the chiral additive is less than 10%.
Cholesteric phase is an important phase of liquid crystal molecules. Within the cholesteric phase, the liquid crystal molecules are arranged in layers and have a continuous helical structure. The liquid crystal molecules in the cholesteric phase may be either left-handed or right-handed. When incident light is incident on the left-handed liquid crystal molecules, the left-handed liquid crystal molecules will undergo Bragg reflection of a portion of the incident light, while another portion of the incident light will be transmitted through the liquid crystal molecules. Wherein the reflected light is left circularly polarized light of a certain wavelength or wavelength range, which may be referred to as a reflected wavelength range or a cut-off wavelength range; and the transmitted light is right circularly polarized light or left circularly polarized light in a non-reflective wavelength range. For another example, when the liquid crystal molecules in the cholesteric phase are right-handed liquid crystal molecules, the right-handed liquid crystal molecules will perform Bragg reflection on a part of the incident light, and another part of the incident light will be transmitted through the liquid crystal molecules. Wherein the reflected light is right circularly polarized light in a certain wavelength range; and the transmitted light is left circularly polarized light or right circularly polarized light in a non-reflective wavelength range. Thus, the liquid crystal molecules in the cholesteric phase can achieve selective reflection.
Because of the special helical structure of cholesteric liquid crystals, the degree of spin axis orientation is more than 80%, and the cholesteric liquid crystals have Bragg reflection characteristics, namely, when the wavelength of incident light meets λ=np, the incident light is reflected, λ is the reflection wavelength, P is the pitch of the cholesteric liquid crystals, namely, the distance when the orientation direction of liquid crystal molecules is subjected to 360 DEG change, and n is the average refractive index of the liquid crystals. In general, n is relatively fixed, the average refractive index of the liquid crystal monomer is 1.4.ltoreq.n.ltoreq.1.6, and the refractive index difference is 0.05.ltoreq.Δn < 0.3, so that the reflection wavelength of cholesteric liquid crystal can be controlled by adjusting the pitch P.
The polymer composite film material of this example has a transmittance of more than 90% for light having a wavelength of 430nm or less and a wavelength of 660nm or more, and has a large transmittance of light, and therefore almost all light having a wavelength of 430nm or less and a wavelength of 660nm or more passes through the polymer composite film material, and the polymer composite film material does not act thereon.
The transmittance of the cholesteric liquid crystal molecules of the polymer composite film material for passing light with the wavelength ranging from 430nm to 490nm, 500nm to 570nm and 590nm to 660nm is about 40% to 50%, namely, part of light waves with the wavelength ranging from 430nm to 490nm, 500nm to 570nm and 590 to 660nm are reflected by the cholesteric liquid crystal molecules. Wherein, the three wavelength ranges of 430 nm-490 nm, 500 nm-570 nm and 590 nm-660 nm correspond to the reflected wavelength being blue wavelength, the reflected wavelength being green wavelength and the reflected wavelength being red wavelength, respectively.
The cholesteric liquid crystal film is used for transmitting one of left circularly polarized light and right circularly polarized light with red light wavelength, green light wavelength and blue light wavelength, reflecting the other, and enabling the transmitted left circularly polarized light or right circularly polarized light to become linearly polarized light after passing through the quarter wave plate.
In a specific example, the quarter wave plate, the polarization conversion layer, is a phase retardation film with 1/4λ, the polarization conversion layer has a non-positive wavelength dispersibility satisfying 0.78 < R Blue /R 0 ＜1.1，0.9＜R Green /R 0 ＜1.1，1＜R Red /R 0 < 1.1, wherein R 0 Is the optical path difference of the center wavelength (580 nm), R Blue R is the optical path difference of blue light wavelength Green Is the green wavelength optical path difference, R Red As for the red wavelength optical path difference, it can be seen that the center wavelength (580 nm) optical path difference is not much different from the blue wavelength optical path difference, the green wavelength optical path difference and the red wavelength optical path difference.
In a specific example, the polarizer is formed by compounding a plurality of layers of films, and the basic structure includes: the most intermediate PVA (polyvinyl alcohol), two layers of TAC (cellulose triacetate), PSA (pressure sensitive adhesive), release film and protective film. The PVA film absorbing the dichroic absorption molecules is responsible for polarization, is a core part of a polarizing plate, determines key optical indexes such as polarization performance, transmittance, color tone and the like of the polarizer, and plays a role in supporting and protecting the extended PVA film. The polaroid is used for transmitting light perpendicular to the absorption axis of the polaroid and absorbing light parallel to the absorption axis of the polaroid.
In a specific example, as shown in fig. 3, taking a case where the polymer composite film reflects the left circularly polarized light of red light, green light and blue light and transmits the right circularly polarized light of red light, green light and blue light, natural light (including red light, green light and blue light) emitted from the display panel passes through the polymer composite film, the polymer composite film reflects the left circularly polarized light accounting for 50% of the total light quantity of the red light, green light and blue light, transmits the right circularly polarized light accounting for 50% of the total light quantity of the emitted natural light, and the reflected left circularly polarized light accounting for 50% of the total light quantity of the emitted natural light becomes the right circularly polarized light after being reflected by, for example, 35% -40% of the reflection cathode 108 of the meal on the display surface, and the right circularly polarized light accounting for 50% × (35% -40%) of the total light of the emitted natural light can be transmitted by the polymer composite film, that is, the 50% of the right circularly polarized light obtained by the transmission of the polymer composite film and the right circularly polarized light accounting for 50% × (35% -40%) of the total light of the emitted natural light after being reflected twice passes through the quarter wave plate. The included angle between the optical axis of the quarter wave plate and the absorption axis of the polaroid is set to enable the first linearly polarized light accounting for 50% +50% × (35% -40%) of total light quantity of emergent natural light to be transmitted by the polaroid, at the moment, the emergent light of the display device seen by human eyes is the light accounting for 50% × (35% -40%) of total light quantity of the emergent natural light of the display panel, namely, the emergent light efficiency of the display device reaches 67.5% -70%, compared with the emergent light efficiency of about 30% in the prior art, the emergent light efficiency of the display device is greatly improved, the display effect is improved, the brightness of the display panel is improved without increasing excessive power consumption, and the power consumption of the display panel is reduced.
In one possible implementation, the pitch of the liquid crystal molecules of the cholesteric liquid crystal film includes a first pitch corresponding to a reflected wavelength of red light, a second pitch corresponding to a reflected wavelength of green light, and a third pitch corresponding to a reflected wavelength of blue light, wherein the second pitch has an overall ratio of greater than 50%.
Further, the overall ratio of the second pitch is 70% to 80%, and the overall ratio of the second pitch is more preferably 75%.
For white light, red band light: green light band light: blue band light approximately equal to 3:6:1, i.e. for white light, the duty ratio of the light in the green light band is the most, so that the overall transmittance of the light in the green light band can be increased to the greatest extent, which can be achieved by increasing the duty ratio of the second pitch, i.e. the cholesteric liquid crystal film or the polymer composite film material, which has the reflection wavelength of the light in the green light band, to achieve the enhancement of the transmittance effect of the cholesteric liquid crystal film or the polymer composite film material for the green light as shown in the comparison of fig. 3 and fig. 1, it can be understood that the distribution density of the second pitch is increased, so that the light path of the light output is increased for the green light in the whole display area as shown in fig. 3 instead of the subareas as shown in fig. 1. Therefore, the light transmittance performance of the high polymer composite film combined with the display panel, the quarter wave plate and the polaroid is higher by setting the ratio of the first pitch, the second pitch and the third pitch. In this embodiment, the overall ratio of the second pitch is set to be greater than 50%, and the sum of the overall ratios of the first pitch and the third pitch is set to be less than 50%.
In a specific example, the pitch of the liquid crystal molecules of the cholesteric liquid crystal film comprises a first pitch corresponding to the reflection wavelength of red light, a second pitch corresponding to the reflection wavelength of green light and a third pitch corresponding to the reflection wavelength of blue light, wherein the first pitch is 420-450 nm as shown in fig. 4, and the corresponding red light wave band is 590-660 nm; the second pitch is shown in FIG. 5, the size is 350-380 nm, and the corresponding green light wave band size is 500-570 nm; the third pitch is shown in FIG. 6, and has a size of 310-340 nm and a corresponding blue light band size of 430-490 nm.
In one possible implementation, the cholesteric liquid crystal film is configured to transmit left circularly polarized light at red, green, and blue wavelengths and reflect right circularly polarized light; and an included angle of 45 degrees is formed between the optical axis of the quarter wave plate and the absorption axis of the polaroid.
In a specific example, when the cholesteric liquid crystal film transmits left circularly polarized light of any one of red light wavelength, green light wavelength and blue light wavelength and reflects right circularly polarized light, when an optical axis of the quarter wave plate forms an included angle of 45 degrees with an absorption axis of the polarizer, 50% +50% × (35% -40%) of linearly polarized light obtained through the quarter wave plate can be completely transmitted out through the polarizer.
In one possible implementation, the cholesteric liquid crystal film is configured to transmit right circularly polarized light of red, green, and blue wavelengths and reflect left circularly polarized light; and an included angle of 135 degrees is formed between the optical axis of the quarter wave plate and the absorption axis of the polaroid.
In a specific example, when the cholesteric liquid crystal film transmits right-handed circularly polarized light of any one of red wavelength, green wavelength and blue wavelength and reflects left-handed circularly polarized light, when an optical axis of the quarter-wave plate forms an included angle of 135 degrees with an absorption axis of the polarizer, 50% +50% × (35% -40%) of linearly polarized light obtained through the quarter-wave plate is transmitted through the polarizer.
FIG. 7 shows a relationship between reflection wavelength and transmittance of red, green and blue light of a polymer composite film material provided by the embodiment of the invention, wherein the abscissa is reflection wavelength, and the unit is nm; the ordinate is the light transmittance in%. a1 represents the light transmittance of red light, b1 represents the light transmittance of green light, and c1 represents the light transmittance of blue light, and it can be seen that the polymer composite film material reflects only light having a wavelength corresponding to the reflection wavelength, and the light transmittance of other wavelengths is more than 90%.
In one possible implementation manner, the display panel includes an encapsulation layer located at the light emitting side, and a refractive index difference between the connection layer and the encapsulation layer is greater than or equal to a preset value.
In one possible implementation, the display device further includes a connection layer disposed between the display panel and the cholesteric liquid crystal film.
In a specific example, as shown in FIG. 3, the display device further comprises an encapsulation layer 20 on the cathode 108 of the display panel, a full connection layer 30 on the encapsulation layer 20, and a cholesteric liquid crystal film 40 on the connection layer 30, wherein
The encapsulation layer 20 has at least 3 layers, including an inorganic encapsulation layer and an organic encapsulation layer, the inorganic encapsulation layer is formed by deposition, and the organic encapsulation layer is formed by inkjet printing. For example, the inorganic encapsulation layer may be formed of an inorganic material such as silicon nitride, silicon oxide, or silicon oxynitride, and the organic encapsulation layer may be formed of an organic material such as Polyimide (PI) or epoxy. Therefore, the inorganic packaging layer and the organic packaging layer are formed into a composite packaging layer, and the composite packaging layer can form multiple protection on the functional structure of the display area and has better packaging effect.
The refractive index of at least one layer of the composite packaging layer is within 0.2 of the refractive index of the connecting layer 30, wherein the refractive index of 2 layers of the composite packaging layer is more than 1.65. The refractive index difference between the connection layer 30 and the encapsulation layer 20 is at least greater than 0.25.
In one possible implementation, the cholesteric liquid crystal film has a thickness of 5 μm to 20 μm.
In one possible implementation, the tie layer thickness is greater than the thickness of the cholesteric liquid crystal film.
In one specific example, the tie layer 30 has a thickness at least 3 times greater than the thickness of the cholesteric liquid crystal film 40.
In one possible implementation, the display device further includes a half-wave plate disposed between the quarter-wave plate and the polarizer.
In a specific example, as shown in fig. 3, the display device further includes a half-wave plate 60, where the half-wave plate 60 is a color adjustment layer, and includes a layer with a 1/2 λ phase difference layer, where the color adjustment layer is used for color correction, and further reduces reflection of the display panel to external ambient light, and in this embodiment, the color adjustment layer is disposed between the polarization conversion layer and the polarizer. The half wave plate does not affect the light transmittance of the final display panel.
In one possible implementation, the display panel is an organic light emitting diode display panel.
In a specific example, three polymer composite films are provided, namely, polymer composite film 1: the thickness is 15um, the pitch of the spiral structure comprises 310-340 nm, 350-380 nm and 420-450 nm, and the pitch in the range of 350-380 nm is approximately equal to 75%; polymer composite film 2: the thickness is 15um, the pitch of the spiral structure comprises 310-340 nm, 350-380 nm and 420-450 nm, and the pitch in the range of 350-380 nm is approximately equal to 55%; polymer composite film 3: the thickness is 10um, the pitch of the spiral structure comprises 310-340 nm, 350-380 nm and 420-450 nm, and the pitch in the range of 350-380 nm is approximately 55%.
Three different examples of display devices, display device 1, display device 2, and display device 3, can be made from polymer composite film 1, polymer composite film 2, and polymer composite film 3, respectively. The display device 1 comprises an OLED display panel, a packaging layer, a connecting layer, a polymer composite film 1, a polarization conversion layer and a polarizing layer; the display device 2 comprises an OLED display panel, a packaging layer, a connecting layer, a polymer composite film 2, a polarization conversion layer and a polarizing layer; the display device 3 includes an OLED display panel, an encapsulation layer, a connection layer, a polymer composite film 3, a polarization conversion layer, and a polarization layer. Fig. 8 shows comparison of power consumption generated by three examples of display devices, and it can be seen that the display device 1 generates the lowest power consumption and the display device 2 generates the highest power consumption, that is, when the thicknesses of the polymer composite films are the same and the pitch in the range of 350nm to 380nm is relatively high, the display device generates lower power consumption.
It can be understood that the display device provided in this embodiment can improve the light extraction efficiency without substantially affecting the effect of eliminating the reflection of the ambient light.
The display device of the embodiment may be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator, which is not limited in this embodiment.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It is further noted that in the description of the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (10)
1. The display device is characterized by comprising a display panel, and a cholesteric liquid crystal film, a quarter wave plate and a polaroid which are sequentially arranged on the light emitting side of the display panel, wherein the cholesteric liquid crystal film is used for transmitting one of left-handed circularly polarized light and right-handed circularly polarized light with red wavelength, green wavelength and blue wavelength and reflecting the other; an included angle between an optical axis of the quarter wave plate and an absorption axis of the polaroid is set to enable the polaroid to transmit circularly polarized light passing through the quarter wave plate;
the pitch of the liquid crystal molecules of the cholesteric liquid crystal film comprises a first pitch corresponding to a reflection wavelength of red light, a second pitch corresponding to a reflection wavelength of green light and a third pitch corresponding to a reflection wavelength of blue light, wherein the integral proportion of the second pitch is more than 50%.
2. The display device of claim 1, wherein the second pitch has an overall ratio of 70% -80%.
3. A display device according to claim 1 or 2, wherein the cholesteric liquid crystal film has a thickness of 5 μm to 20 μm.
4. The display device according to claim 1, wherein the cholesteric liquid crystal film is configured to transmit left circularly polarized light of red light wavelength, green light wavelength, and blue light wavelength, and reflect right circularly polarized light; and an included angle of 45 degrees is formed between the optical axis of the quarter wave plate and the absorption axis of the polaroid.
5. The display device according to claim 1, wherein the cholesteric liquid crystal film is configured to transmit right circularly polarized light of red light wavelength, green light wavelength, and blue light wavelength, and reflect left circularly polarized light; and an included angle of 135 degrees is formed between the optical axis of the quarter wave plate and the absorption axis of the polaroid.
6. The display device of claim 1, further comprising a half wave plate disposed between the quarter wave plate and the polarizer.
7. The display device according to claim 1, further comprising a connection layer provided between the display panel and the cholesteric liquid crystal film.
8. The display device according to claim 7, wherein the connection layer has a thickness greater than that of the cholesteric liquid crystal film.
9. The display device according to claim 7, wherein the display panel includes an encapsulation layer on a light-emitting side, and a refractive index difference between the connection layer and the encapsulation layer is equal to or greater than a preset value.
10. The display device of claim 1, wherein the display panel is an organic light emitting diode display panel.
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| CN114582950A (en) * | 2022-04-24 | 2022-06-03 | 西安明为光学科技有限公司 | OLED display panel and display |
| CN115268136B (en) * | 2022-08-19 | 2023-10-20 | 京东方科技集团股份有限公司 | Display panel and display device |
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| KR20130012782A (en) * | 2011-07-26 | 2013-02-05 | 삼성디스플레이 주식회사 | Optical film, method of fabricating the same, and display apparatus having the same |
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| CN104155714A (en) * | 2014-07-10 | 2014-11-19 | 京东方科技集团股份有限公司 | Optical structure and preparation method thereof, backlight module, and display device |
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