CN113985673A - Display device - Google Patents
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- CN113985673A CN113985673A CN202111368099.7A CN202111368099A CN113985673A CN 113985673 A CN113985673 A CN 113985673A CN 202111368099 A CN202111368099 A CN 202111368099A CN 113985673 A CN113985673 A CN 113985673A
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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
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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
- G02F1/13363—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 panel comprises a display panel, a cholesteric liquid crystal film, a quarter wave plate and a polarizer, wherein the cholesteric liquid crystal film, the quarter wave plate and the polarizer are sequentially arranged on the light emergent side of the display panel, and the cholesteric liquid crystal film is used for transmitting one of left-handed circularly polarized light and right-handed circularly polarized light of red light wavelength, green light wavelength and blue light wavelength and reflecting the other one; and an included angle between the optical axis of the quarter-wave plate and the absorption axis of the polarizer is set to enable the polarizer to transmit 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 light (reflect ambient light to human eyes) of a display panel, a quarter-wave plate and a polarizer are generally sequentially arranged at the light emitting side of the display panel, at this time, natural light (i.e., unpolarized light) emitted by the display panel still passes through the quarter-wave plate and then is natural light, after passing through the polarizer, the natural light passes through the polarizer in a direction parallel to the transmission axis of the polarizer, light in a direction parallel to the absorption axis of the polarizer is absorbed by the polarizer, the light transmittance emitted by the display panel is less than 50% (about 30%), the light emitting efficiency of the display panel is low, and the power consumption is increased.
Disclosure of Invention
An object of the present invention is to provide a display device to solve at least one of the problems of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a display device, which comprises a display panel, a cholesteric liquid crystal film, a quarter wave plate and a polaroid, wherein the cholesteric liquid crystal film, the quarter wave plate and the polaroid are sequentially arranged on a light emergent side of the display panel, and the cholesteric liquid crystal film is used for transmitting one of left-handed circularly polarized light and right-handed circularly polarized light of red light wavelength, green light wavelength and blue light wavelength and reflecting the other one; and an included angle between the optical axis of the quarter-wave plate and the absorption axis of the polarizer is set to enable the polarizer to transmit circularly polarized light passing through the quarter-wave plate.
Optionally, the helical pitches of the liquid crystal molecules of the cholesteric liquid crystal film include a first helical pitch corresponding to a reflection wavelength of a red light wavelength, a second helical pitch corresponding to a reflection wavelength of a green light wavelength, and a third helical pitch corresponding to a reflection wavelength of a blue light wavelength, wherein the overall ratio of the second helical pitch is greater than 50%.
Optionally, the second pitch is 70% to 80% in total.
Optionally, 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-handed circularly polarized light of red light wavelength, green light wavelength and blue light wavelength and reflecting right-handed circularly polarized light; and the optical axis of the quarter-wave plate and the absorption axis of the polaroid form an included angle of 45 degrees.
Optionally, the cholesteric liquid crystal film is used for transmitting right-handed circularly polarized light of red light wavelength, green light wavelength and blue light wavelength and reflecting left-handed circularly polarized light; the optical axis of the quarter-wave plate and the absorption axis of the polarizer form an included angle of 135 degrees.
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 connecting layer disposed between the display panel and the cholesteric liquid crystal film.
Optionally, the connecting layer has a thickness greater than a thickness of the cholesteric liquid crystal film.
Optionally, the display panel includes an encapsulation layer located on the light exit side, and a difference between refractive indexes of 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 invention has the following beneficial effects:
according to the technical scheme, the cholesteric liquid crystal film is arranged between the light emergent 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 one; the included angle between the optical axis of the quarter-wave plate and the absorption axis of the polarizer is set to enable the polarizer 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 embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of an 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 illustrating an optical path principle of a display device according to an embodiment of the present invention.
Fig. 4 shows a first pitch diagram.
Fig. 5 shows a second pitch diagram.
Fig. 6 shows a third pitch diagram.
Fig. 7 is a schematic diagram illustrating a relationship curve 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 diagram of power consumption generated by three examples provided by the embodiment 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 the following examples and the accompanying drawings. Similar parts in the figures 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 is not to be taken as limiting the scope of the invention.
In order to avoid the ambient light from reflecting into human eyes, in the conventional display device, a quarter-wave plate and a polarizer are sequentially stacked on a display panel, the ambient light passes through a linear polarizer with a vertical absorption axis, the light passing through the linear polarizer with a horizontal absorption axis passes through the linear polarizer, the light in the vertical direction is absorbed, i.e., the unpolarized light is changed into incident linearly polarized light in the horizontal direction, the light continues to advance, passes through the quarter-wave plate, the light is changed from the incident linearly polarized light in the horizontal direction into left circularly polarized light, the light continues to advance to a reflector plate on the lower layer of the quarter-wave plate, rotates 180 degrees, the light is emitted back and changed into right circularly polarized light, the right circularly polarized light passes through the quarter-wave plate again, the light becomes reflected linearly polarized light, but the direction of the reflected linearly polarized light is perpendicular to the direction of the incident linearly polarized light passing through the quarter-wave plate for the first time, namely, the linear polarization light becomes vertical direction, and the linear polarization light in the vertical direction is parallel to the absorption axis of the polarizer, so that the linear polarization light is absorbed by the polarizer and does not transmit to the surface of the display Panel (Panel).
But can bring the efficiency greatly reduced of the light of display panel self outgoing simultaneously, need to increase higher consumption and just can maintain the intensity of the emergent light that display panel set for originally, specifically do: as shown in fig. 1, after light emitted from the display panel 1 passes through the quarter-wave plate 2, the light emitted from the display panel can pass through, no light in any vibration direction is absorbed, the light continues to advance, and passes through the polarizer 3, light in a vibration direction perpendicular to an absorption axis of the polarizer 3, for example, light in a vertical direction can pass through, parallel light is absorbed, that is, unpolarized light is converted into linearly polarized light in an emission direction in a horizontal direction, at this time, light emitted from the panel is converted into light in each direction, that is, only light in a direction perpendicular to the absorption axis, that is, in a horizontal direction, is left, light emitted from the display panel is smaller than 50% and about 30% of light emitted from the display panel, and if people want to see the intensity of light emitted from the display panel originally set, display brightness must be increased, and the light emission brightness of the display panel is improved at the expense of higher power consumption.
In view of this, 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, which are sequentially disposed on a light exit side of the display panel, wherein the cholesteric liquid crystal film is configured to transmit one of left-handed circularly polarized light and right-handed circularly polarized light of red light wavelength, green light wavelength and blue light wavelength, and reflect the other; an included angle between an optical axis (also called a phase axis) of the quarter-wave plate and an absorption axis of the polarizer is set to enable the polarizer to transmit circularly polarized light passing through the quarter-wave plate.
In a 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 a 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 a transparent oxide of ITO, IZO, etc., or a composite electrode formed of Ag/ITO, Ag/IZO, CNT/ITO, CNT/IZO, GO/ITO, GO/IZO, etc.
The hole injection layer 101 may be HATCN, MnO3The injection material can be P-type doped in the hole transport material, the thickness of the layer is 5-20 nm, and the hole transport material can be P-type dopedAnd forming a hole injection layer by co-evaporation.
The material of the hole transport layer 102 is a material having good hole transport characteristics.
The Electron Blocking Layer (EBL)103 comprises a blue light exciton blocking layer, a red light exciton blocking layer and a green light exciton blocking layer, wherein the thickness of the blue light exciton blocking layer is 1-10 nm, and the electron blocking layer is mainly used for transferring holes and blocking electrons and excitons generated in the light emitting layer; the thickness of the red light exciton blocking layer is adjusted between 40nm and 60 nm; the thickness of the green light exciton blocking layer is adjusted to be 15-30 nm.
The material of the luminescent layer (EML)104 is an organic material and comprises a blue luminescent layer, a red luminescent layer and a green luminescent layer, wherein the thickness of the blue luminescent layer is adjusted between 15 nm and 25 nm; the thickness of the red light emitting layer is adjusted to be 25-40 nm; the thickness of the green light emitting layer is adjusted to be 25-40 nm.
The thickness of the Hole Blocking Layer (HBL)105 ranges from 2nm to 10nm, and the hole blocking layer is mainly used for transferring electrons and blocking holes.
The material of the Electron Transport Layer (ETL)106 is a material having good electron transport properties.
The Electron Injection Layer (EIL)107 can be prepared by evaporation of LiF, LiQ, Yb, Ca, etc. of 0.5nm to 2 nm.
The cathode 108 may be made by evaporation of a 10nm to 20nm film of Mg, Ag, Al, or an alloy such as Mg: Ag, preferably in a ratio of 3: 7-1: 9, adjusting the metal film layer to have a transmittance reference range of 50-60% at 530nm to form a semitransparent cathode; transparent cathode can also be prepared by using transparent oxide ITO, IZO, IGZO and other materials.
The cholesteric liquid crystal film 40 is a polymer composite film material, which comprises a liquid crystal monomer and a chiral additive, wherein the chiral additive is added into liquid crystal molecules to enable the orientation of the liquid crystal molecules to be twisted, so that the liquid crystal molecules with a certain pitch and a cholesteric phase are formed. In this example, the doping percentage of the chiral additive was < 10%.
Cholesteric phase is an important phase state of liquid crystal molecules. In the cholesteric phase, liquid crystal molecules are arranged in a layered manner and have a continuous helical structure. The liquid crystal molecules in the cholesteric phase can be left-handed liquid crystal molecules or right-handed liquid crystal molecules. When incident light is incident on the left-handed liquid crystal molecules, part of the incident light is subjected to Bragg reflection by the left-handed liquid crystal molecules, and the other part of the incident light is transmitted through the liquid crystal molecules. Wherein the reflected light is left-handed circularly polarized light of a certain wavelength or wavelength range, which may be referred to as the reflection wavelength range or the cut-off wavelength range; and the transmitted light is right-handed circularly polarized light or left-handed circularly polarized light in a non-reflective wavelength range. For example, when the liquid crystal molecules in the cholesteric phase are right-handed liquid crystal molecules, a part of incident light is bragg-reflected by the right-handed liquid crystal molecules, and the other part of the incident light is transmitted through the liquid crystal molecules. Wherein, the reflected light is right-handed circularly polarized light in a certain wavelength range; and the transmitted light is left-handed circularly polarized light or right-handed circularly polarized light in the non-reflective wavelength range. Therefore, the liquid crystal molecules in the cholesteric phase can realize selective reflection.
Due to the special helical structure of cholesteric liquid crystals, the degree of alignment of their spin axes is > 80%, and they have bragg reflection characteristics, i.e. incident light will be reflected when its wavelength satisfies λ ═ np, where λ is the reflection wavelength, P is the pitch of the cholesteric liquid crystal, i.e. the distance at which the orientation direction of the liquid crystal molecules undergoes a 360 ° change, and n is the average refractive index of the liquid crystal. Generally, 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. DELTA.n < 0.3, so that the reflection wavelength of the cholesteric liquid crystal can be controlled by adjusting the pitch P.
Since the transmittance of the polymer composite film material of the present embodiment to light having a wavelength of 430nm or less and a wavelength of 660nm or more is higher than 90%, the light transmittance is high, and therefore, light having a wavelength of 430nm or less and a wavelength of 660nm or more is almost transmitted through the polymer composite film material, and the polymer composite film material does not work.
The transmittance of light with wavelength ranges of 430 nm-490 nm, 500 nm-570 nm and 590 nm-660 nm through the cholesteric liquid crystal molecules of the polymer composite film material is about 40% -50%, namely, part of light waves with wavelength ranges of 430 nm-490 nm, 500 nm-570 nm and 590-660 nm are reflected by the cholesteric liquid crystal molecules. Wherein, the wavelength ranges of three bands of 430 nm-490 nm, 500 nm-570 nm and 590 nm-660 nm respectively correspond to the blue light wavelength, the green light wavelength and the red light wavelength.
The cholesteric liquid crystal film 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, and the transmitted left-handed circularly polarized light or right-handed circularly polarized light becomes linearly polarized light after passing through the quarter wave plate.
In one specific example, the quarter-wave plate, i.e., the polarization conversion layer, is a phase retardation film having 1/4 λ, the polarization conversion layer having a non-positive wavelength dispersion satisfying 0.78 < RBlue/R0＜1.1，0.9＜RGreen/R0＜1.1，1＜RRed/R0< 1.1, wherein R0Is the optical path difference of the central wavelength (580nm), RBlueIs the wavelength path difference of blue light, RGreenIs the wavelength path difference of green light, RRedFor the optical path difference of red light wavelength, it can be seen that the optical path difference of the central wavelength (580nm) is not much different from the optical path difference of blue light wavelength, the optical path difference of green light wavelength and the optical path difference of red light wavelength.
In one specific example, the polarizer is compounded by multilayer films, and the basic structure comprises: the most central PVA (polyvinyl alcohol), two layers of TAC (triacetylcellulose), PSA (pressure sensitive adhesive), release film and protective film. The PVA film adsorbing the two-way absorption molecules is responsible for polarization, is a core part of a polarizing plate, determines key optical indexes such as polarization performance, transmittance and color tone of the polarizing plate, and the TAC film 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 the example that the polymer composite film material reflects left-handed circularly polarized light of red light, green light and blue light and transmits right-handed circularly polarized light of red light, green light and blue light, after natural light (including red light, green light and blue light) emitted by the display panel passes through the polymer composite film material, the polymer composite film material reflects the left-handed circularly polarized light accounting for 50% of the total amount of emitted natural light, transmits the right-handed circularly polarized light accounting for 50% of the total amount of emitted natural light, and the reflected left-handed circularly polarized light accounting for 50% of the total amount of emitted natural light is reflected by the reflective cathode 108 of the display panel to be 35% to 40% to become right-handed circularly polarized light, which can be transmitted by the polymer composite film material, that is, the right-handed circularly polarized light accounting for 50% of the total amount of emitted natural light and the right-handed circularly polarized light accounting for 50% of the total amount of emitted natural light can be transmitted by the polymer composite film material and can be reflected twice to become 50% by the polymer composite film material to be 35% to 40% ) The right-handed circularly polarized light of (2) is processed by the quarter-wave plate to obtain the first linearly polarized light accounting for 50% + 50% × (35% -40%) of the total light quantity of the emergent natural light. The optical axis that sets up the quarter-wave plate with the contained angle of the absorption axis of polaroid makes the aforesaid account for emergent natural light total light quantity 50% + 50% × (35% -40%) first line polarization polarized light transmitted by the polaroid, the light of the display device outgoing that people's eyes saw at this moment is for accounting for display panel emergent natural light total light quantity 50% × (35% -40%) light, display device's luminous efficiency reaches 67.5% -70% promptly, compare with prior art about 30% luminous efficiency, greatly increased display device's luminous efficiency, display effect has been promoted, need not increase too big consumption and promote display panel's luminance, display panel's consumption has been reduced.
In one possible implementation manner, the pitches of the liquid crystal molecules of the cholesteric liquid crystal film include a first pitch corresponding to a reflection wavelength of a red light wavelength, a second pitch corresponding to a reflection wavelength of a green light wavelength, and a third pitch corresponding to a reflection wavelength of a blue light wavelength, wherein the overall ratio of the second pitch is greater than 50%.
Further, the overall percentage of the second pitch is 70% to 80%, and the overall percentage of the second pitch is more preferably 75%.
For white light, red band light: green band light: blue light band light ≈ 3: 6: 1, that is, for white light, the green band light accounts for the most, so increasing the overall transmission performance of the green band light can increase the brightness of the display panel to the greatest extent, which can be achieved by increasing the second pitch ratio of which the reflection wavelength is the green wavelength, and increasing the second pitch ratio, that is, the cholesteric liquid crystal film or the polymer composite film realizes the increased transmittance effect on green light as shown in the comparison between fig. 3 and fig. 1, it can be understood that increasing the distribution density of the second pitch makes the light-emitting path of green light in the entire display area increase as shown in fig. 3 rather than the sub-area as shown in fig. 1. Therefore, the light transmittance performance of the polymer composite film combined with the display panel, the quarter-wave plate and the polarizer is higher by setting the proportion of the first pitch, the second pitch and the third pitch. In the present embodiment, the integral proportion of the second pitch is set to be greater than 50%, and the total proportion of the first pitch and the third pitch is set to be less than 50%.
In a specific example, the thread pitches of the liquid crystal molecules of the cholesteric liquid crystal film comprise a first thread pitch corresponding to the reflection wavelength of red light, a second thread pitch corresponding to the reflection wavelength of green light and a third thread pitch corresponding to the reflection wavelength of blue light, wherein the first thread pitch is 420-450 nm in size, and the corresponding red light wave band is 590-660 nm in size as shown in FIG. 4; the second screw pitch is 350-380 nm as shown in figure 5, and the corresponding green light wave band is 500-570 nm; the third pitch is 310-340 nm as shown in FIG. 6, and the corresponding blue light band is 430-490 nm.
In one possible implementation, the cholesteric liquid crystal film is used for transmitting left-handed circularly polarized light of red light wavelength, green light wavelength and blue light wavelength and reflecting right-handed circularly polarized light; and the optical axis of the quarter-wave plate and the absorption axis of the polaroid form an included angle of 45 degrees.
In a specific example, when the cholesteric liquid crystal film transmits left-handed circularly polarized light with any one of red light wavelength, green light wavelength and blue light wavelength and reflects right-handed circularly polarized light, when an included angle of 45 degrees is formed between the optical axis of the quarter-wave plate and the absorption axis of the polarizer, the linearly polarized light passing through the quarter-wave plate and obtained by 50% + 50% × (35% -40%) is completely transmitted by the polarizer.
In one possible implementation, the cholesteric liquid crystal film is used for transmitting right-handed circularly polarized light of red light wavelength, green light wavelength and blue light wavelength and reflecting left-handed circularly polarized light; the optical axis of the quarter-wave plate and the absorption axis of the polarizer form an included angle of 135 degrees.
In a specific example, when the cholesteric liquid crystal film transmits right-handed circularly polarized light with any one of red light wavelength, green light wavelength and blue light wavelength and reflects left-handed circularly polarized light, when an included angle of 135 degrees is formed between the optical axis of the quarter-wave plate and the absorption axis of the polarizer, the linearly polarized light passing through the quarter-wave plate and obtained by 50% + 50% × (35% -40%) is completely transmitted through the polarizer.
Fig. 7 shows a relationship curve between the reflection wavelength and the transmittance of red, green and blue light of the polymer composite film provided in the embodiment of the present invention, wherein the abscissa is the reflection wavelength and the unit is nm; the ordinate is the light transmission in%. a1 represents the transmittance of red light, b1 represents the transmittance of green light, and c1 represents the 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 transmittance of light having other wavelengths is greater than 90%.
In a possible implementation manner, the display panel includes an encapsulation layer located on a light emitting side, and a difference between refractive indexes of 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 one specific example, as shown in fig. 3, the display device further includes 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 packaging layer 20 at least comprises a 3-layer structure and comprises an inorganic packaging layer and an organic packaging layer, wherein the inorganic packaging layer is formed by adopting a deposition mode and the like, and the organic packaging layer is formed by adopting an ink-jet printing mode. For example, the inorganic encapsulating layer may be formed using an inorganic material such as silicon nitride, silicon oxide, or silicon oxynitride, and the organic encapsulating layer may be formed using an organic material such as Polyimide (PI) or epoxy resin. Therefore, the inorganic packaging layer and the organic packaging layer form a composite packaging layer, the composite packaging layer can form multiple protection on the functional structure of the display area, and the packaging effect is better.
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 difference in refractive index between the connecting 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 connecting layer has a thickness greater than the thickness of the cholesteric liquid crystal film.
In one particular example, the tie layer 30 is at least 3 times thicker than the cholesteric liquid crystal film 40.
In one possible implementation manner, 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 phase difference of 1/2 λ, and the color adjustment layer is used for color correction to further reduce reflection of ambient light from the display panel. 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, a 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 accounts for about 75%; polymer composite membrane 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 accounts for about 55%; polymer composite membrane 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 accounts for about 55%.
Three different display device examples can be made from the polymer composite film material 1, the polymer composite film material 2 and the polymer composite film material 3, namely the display device 1, the display device 2 and the display device 3. The display device 1 comprises an OLED display panel, an encapsulation layer, a connecting layer, a high polymer composite film 1, a polarization conversion layer and a polarizing layer; the display device 2 comprises an OLED display panel, an encapsulation layer, a connecting layer, a high polymer composite film 2, a polarization conversion layer and a polarization layer; the display device 3 comprises an OLED display panel, an encapsulation layer, a connecting layer, a polymer composite film 3, a polarization conversion layer and a polarization layer. Fig. 8 shows a comparison of power consumption generated by three display device examples, and it can be seen that the power consumption generated by the display device 1 is the lowest, and the power consumption generated by the display device 2 is the highest, that is, when the thickness of the polymer composite film is the same and the pitch ratio in the range of 350nm to 380nm is higher, the power consumption generated by the display device is lower.
It can be understood that the display device provided by the embodiment can improve the light extraction efficiency and basically does not affect the effect of eliminating the ambient light reflection.
The display device of this embodiment may be any product or component having 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 terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is further noted that, in the description of the present invention, relational terms such as first and second, and the like may be 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and all obvious variations and modifications belonging to the technical scheme of the present invention are within the protection scope of the present invention.
Claims (11)
1. A display device is characterized by comprising a display panel, a cholesteric liquid crystal film, a quarter wave plate and a polarizer, wherein the cholesteric liquid crystal film, the quarter wave plate and the polarizer are sequentially arranged on a light emergent side of the display panel, and the cholesteric liquid crystal film is used for transmitting one of left-handed circularly polarized light and right-handed circularly polarized light of red light wavelength, green light wavelength and blue light wavelength and reflecting the other one; and an included angle between the optical axis of the quarter-wave plate and the absorption axis of the polarizer is set to enable the polarizer to transmit circularly polarized light passing through the quarter-wave plate.
2. The display device according to claim 1, wherein pitches of liquid crystal molecules of the cholesteric liquid crystal film include a first pitch corresponding to a reflection wavelength of a red light wavelength, a second pitch corresponding to a reflection wavelength of a green light wavelength, and a third pitch corresponding to a reflection wavelength of a blue light wavelength, wherein the second pitch is more than 50% in total.
3. The display device according to claim 2, wherein the second pitch is 70% to 80% in total.
4. A display device as claimed in any one of claims 1 to 3, characterised in that the thickness of the cholesteric liquid crystal film is from 5 μm to 20 μm.
5. The display device according to claim 1, wherein the cholesteric liquid crystal film transmits left-circularly polarized light of red, green, and blue wavelengths and reflects right-circularly polarized light; and the optical axis of the quarter-wave plate and the absorption axis of the polaroid form an included angle of 45 degrees.
6. The display device according to claim 1, wherein the cholesteric liquid crystal film transmits right-handed circularly polarized light of red, green, and blue wavelengths and reflects left-handed circularly polarized light; the optical axis of the quarter-wave plate and the absorption axis of the polarizer form an included angle of 135 degrees.
7. The display device according to claim 1, further comprising a half-wave plate disposed between the quarter-wave plate and the polarizer.
8. The display device according to claim 1, further comprising a connection layer disposed between the display panel and the cholesteric liquid crystal film.
9. A display device as claimed in claim 8, characterised in that the connecting layer is thicker than the cholesteric liquid crystal film.
10. The display device according to claim 8, wherein the display panel comprises an encapsulation layer on a light emitting side, and a difference between refractive indexes of the connection layer and the encapsulation layer is greater than or equal to a preset value.
11. The display device according to claim 1, wherein the display panel is an organic light emitting diode display panel.
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