CN115185123B - Liquid crystal display - Google Patents
Liquid crystal display Download PDFInfo
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- CN115185123B CN115185123B CN202210836858.6A CN202210836858A CN115185123B CN 115185123 B CN115185123 B CN 115185123B CN 202210836858 A CN202210836858 A CN 202210836858A CN 115185123 B CN115185123 B CN 115185123B
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- wave plate
- liquid crystal
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- absorption axis
- polarizer
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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
- G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
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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
Abstract
The application provides a liquid crystal display screen; the liquid crystal display comprises a display panel, a first polaroid arranged on the light incident side of the display panel, a second polaroid arranged on the light emergent side of the display panel, and a first half-wave plate arranged on one side of the first polaroid close to the second polaroid, wherein the absorption axis of the first polaroid is parallel to the absorption axis of the second polaroid, and the included angle between the optical axis of the first half-wave plate and the absorption axis of the first polaroid is 45 degrees; according to the application, the first polaroid with the absorption axis parallel to the absorption axis of the second polaroid is arranged on the light incident side of the display panel, and the first half-wave plate with the optical axis at an included angle of 45 degrees with the absorption axis of the first polaroid is arranged on the side, close to the second polaroid, of the first polaroid, so that the problem that the current liquid crystal display screen cannot break through the oversized display field due to the wide limit of the polaroids can be solved on the premise of realizing positive production display.
Description
Technical Field
The application relates to the field of display technology, in particular to a liquid crystal display screen.
Background
At present, a polarizer is respectively arranged on a light-emitting surface and a backlight surface of the liquid crystal display panel, absorption axes of the two polarizers are mutually perpendicular to realize a matching effect, natural light without polarization is converted into polarized light, and whether light penetration is controlled by the turning of liquid crystal is controlled, so that a display picture is generated.
However, the cutting width of the polarizer coiled material is limited by the cutting equipment, so that the width of one polarizer cannot meet the requirement of the oversized liquid crystal display panel, and the development of the oversized liquid crystal display panel is limited.
Disclosure of Invention
The application provides a liquid crystal display screen, which aims to solve the technical problem that the current liquid crystal display screen cannot break through the oversized display field due to the wide limit of a polaroid.
In order to solve the technical problems, the technical scheme provided by the application is as follows:
the application provides a liquid crystal display, comprising:
a display panel;
the first polaroid is arranged on the light incident side of the display panel;
the second polaroid is arranged on the light emitting side of the display panel; and
the first half wave plate is arranged on one side of the first polaroid, which is close to the second polaroid;
the absorption axis of the first polaroid is parallel to the absorption axis of the second polaroid, and an included angle between the optical axis of the first half-wave plate and the absorption axis of the first polaroid is 45 degrees.
In the liquid crystal display screen, the first half-wave plate comprises a plurality of liquid crystal film layers which are arranged in a laminated mode, and the liquid crystal film layers comprise a plurality of liquid crystal molecules;
wherein a plurality of the liquid crystal molecules are arranged along the same direction, and an included angle between a long axis of the liquid crystal molecules and an absorption axis of the first polarizer is 45 degrees.
In the liquid crystal display screen, the liquid crystal display screen further comprises a second half-wave plate and a third half-wave plate, wherein the second half-wave plate is positioned on one side of the first half-wave plate, which is close to the first polaroid, and the third half-wave plate is positioned on one side of the first half-wave plate, which is far away from the first polaroid;
the included angle between the optical axis of the second half-wave plate and the absorption axis of the first polaroid is smaller than the included angle between the optical axis of the first half-wave plate and the absorption axis of the first polaroid, and the included angle between the optical axis of the third half-wave plate and the absorption axis of the first polaroid is larger than the included angle between the optical axis of the first half-wave plate and the absorption axis of the first polaroid.
In the liquid crystal display screen of the present application, the second half-wave plate and the third half-wave plate include the liquid crystal film layer stacked in multiple layers.
In the liquid crystal display screen of the application, the sum of the included angle between the optical axis of the second half-wave plate and the absorption axis of the first polarizer and the included angle between the optical axis of the third half-wave plate and the absorption axis of the first polarizer is 90 degrees.
In the liquid crystal display screen of the application, an included angle between the optical axis of the second half-wave plate and the absorption axis of the first polarizer is 11 degrees, and an included angle between the optical axis of the third half-wave plate and the absorption axis of the first polarizer is 79 degrees.
In the liquid crystal display screen, the display panel comprises a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate and the second substrate are oppositely arranged, and the liquid crystal layer is arranged between the first substrate and the second substrate;
wherein the liquid crystal in the liquid crystal layer is vertically aligned liquid crystal, and the number of the liquid crystal film layers in the first half-wave plate is greater than or equal to 11 and less than or equal to 13.
In the liquid crystal display screen of the present application, the liquid crystal molecules have a first refractive index and a second refractive index, the first refractive index being a refractive index for ordinary rays, the second refractive index being a refractive index for extraordinary rays;
wherein the first refractive index and the second refractive index satisfy Δn= (2a+1) λ/2, Δn is a difference between the second refractive index and the first refractive index, d is a thickness of the first half-wave plate along a stacking direction of the plurality of liquid crystal film layers, λ is a wavelength of visible light, and a is an integer greater than or equal to 0.
In the liquid crystal display of the present application, a difference between the second refractive index and the first refractive index is 0.09 to 0.11.
In the liquid crystal display panel of the present application, the thickness of the first half-wave plate is 2.5 micrometers to 2.7 micrometers in the lamination direction of the plurality of liquid crystal film layers.
Advantageous effects
According to the application, the first polaroid with the absorption axis parallel to the absorption axis of the second polaroid is arranged on the light incident side of the display panel, the first half-wave plate with the optical axis at an angle of 45 degrees with the absorption axis of the first polaroid is arranged on one side, close to the second polaroid, of the first polaroid, the combined effect of the first polaroid and the first half-wave plate is the same as that of the lower side polaroid with the absorption axis perpendicular to the absorption axis of the upper side polaroid in the conventional liquid crystal display, and the first polaroid is parallel to the absorption axis of the second polaroid because the absorption axis is parallel to the absorption axis of the second polaroid, so that the first polaroid and the second polaroid can be cut by cutting equipment with the same cutting width, and the problem that the current liquid crystal display cannot break through the oversized display field due to the wide limit of the polaroids is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a first stacked structure of a liquid crystal display according to the present application;
FIG. 2 is a schematic diagram of a laminated structure of a first half-wave plate, a second half-wave plate and a third half-wave plate according to the present application;
FIG. 3 is a schematic perspective view of the first half-wave plate/second half-wave plate/third half-wave plate according to the present application;
FIG. 4 is a schematic diagram of the result of detecting the light intensity transmittance of the LCD according to the present application;
FIG. 5 is a schematic view of a first "Poincare sphere" of a color cast test of a liquid crystal display according to the present application;
FIG. 6 is a simplified schematic diagram of a second stacked structure of a liquid crystal display according to the present application;
fig. 7 is a schematic diagram of a second "poincare sphere" of the color shift test of the lcd according to the present application.
Reference numerals illustrate:
100. a display panel; 110. an array substrate; 120. a liquid crystal layer; 130. a color film substrate; 200. a first polarizer; 300. a second polarizer; 400. a first half-wave plate; 500. a second half-wave plate; 600. a third half-wave plate; 700. a liquid crystal film layer; 800. a backlight module; 810. a backlight; 820. a light guide plate.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and description only, and is not intended to limit the application. In the present application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.
At present, the liquid crystal display panel is respectively provided with a polarizer on the light-emitting surface and the backlight surface, and the absorption axes of the two polarizers are mutually perpendicular to realize the cooperation, for example, the absorption axis of the lower side polarizer on the backlight surface is in the 90-degree direction, and the absorption axis of the upper side polarizer on the light-emitting surface is in the 0-degree direction. The lower polarizing plate converts natural light without polarization into polarized light with the polarization direction of 0 degrees, and then controls whether light penetrates or not through liquid crystal steering in the liquid crystal display panel. When no electric field changes, the liquid crystal molecules do not deflect, the polarization direction of the 0-degree linearly polarized light emitted by the lower polarizing plate is not changed and is absorbed by the polarizer with the upper absorption axis of 0-degree, and the liquid crystal molecules are in dark state without light transmission; when the electric field changes, the liquid crystal molecules deflect, the polarization direction of the 0-degree linearly polarized light emitted by the lower-side polarizing plate changes into 90-degree linearly polarized light, the light is not absorbed when the light passes through the upper-side polarizing plate with the absorption axis of 0-degree, and the light passes through the upper-side polarizing plate to display a picture.
However, the current step is limited by the cutting equipment due to the cutting width of the polarizer coiled material, so that the width of the lower polarizer cannot meet the requirement of the oversized liquid crystal display panel, and the development of the oversized liquid crystal display panel is limited. The application provides the following scheme based on the technical problems.
Referring to fig. 1 to 7, the present application provides a liquid crystal display, which includes a display panel 100, a first polarizer 200 disposed on a light incident side of the display panel 100, a second polarizer 300 disposed on a light emergent side of the display panel 100, and a first half-wave plate 400 disposed on a side of the first polarizer 200 adjacent to the second polarizer 300. The absorption axis of the first polarizer 200 is parallel to the absorption axis of the second polarizer 300, and the included angle between the optical axis of the first half-wave plate 400 and the absorption axis of the first polarizer 200 is 45 °.
According to the application, the first polarizer 200 with the absorption axis parallel to the absorption axis of the second polarizer 300 is arranged on the light incident side of the display panel 100, and the first half-wave plate 400 with the optical axis at an angle of 45 degrees with the absorption axis of the first polarizer 200 is arranged on the side, close to the second polarizer 300, of the first polarizer 200, so that the combined effect of the first polarizer 200 and the first half-wave plate 400 is the same as that of a lower polarizing plate with the absorption axis perpendicular to the absorption axis of an upper polarizing plate in a conventional liquid crystal display. In the present application, the absorption axis of the first polarizer 200 is parallel to the absorption axis of the second polarizer 300, so that the first polarizer 200 and the second polarizer 300 can be cut by a cutting device with the same cutting width, thereby solving the problem that the current liquid crystal display cannot break through the oversized display field due to the width limitation of the polarizers.
Specifically, the implementation principle of the embodiment of the application can be as follows:
assuming that the absorption axis direction of the first polarizer 200 and the second polarizer 300 is 0 °, the optical axis direction of the first half wave plate 400 is 45 °. The natural light is changed into linear polarized light with a polarization direction of 0 ° through the first polarizer 200, and the linear polarized light with a polarization direction of 90 ° is changed into linear polarized light with a polarization direction of 0 ° through the first half wave plate 400. When no electric field changes, the liquid crystal molecules in the display panel 100 do not deflect, the polarization direction of the 90-degree linearly polarized light emitted by the first polarizer 200 and the first half-wave plate 400 is not changed and is absorbed by the second polarizer 300 with the absorption axis of 0-degree direction, and no light is transmitted, so that a dark state is presented; when the electric field changes, the liquid crystal molecules deflect, the polarization direction of the 90-degree linearly polarized light emitted by the first polarizer 200 and the first half-wave plate 400 becomes 0 degrees, the light is not absorbed when the light passes through the upper-side polarizer with the absorption axis of 0 degrees, and the light passes through the upper-side polarizer to display a picture.
The technical scheme of the present application will now be described with reference to specific embodiments. The following description of the embodiments is not intended to limit the preferred embodiments.
Referring to fig. 1, in the lcd of the present application, the lcd may further include a backlight module 800 disposed on the light incident side of the display panel 100, the backlight module 800 may include a backlight 810 and a light guide plate 820 disposed on the light emitting side of the backlight 810, and the light guide plate 820 is disposed parallel to the display panel 100.
In this embodiment, the display panel 100 is a liquid crystal display panel 100, and the liquid crystal display panel 100 may include a first substrate, a second substrate, and a liquid crystal layer 120 disposed between the first substrate and the second substrate. The first substrate may be an array substrate 110, and the second substrate may be a color film substrate 130. The first polarizer 200 is disposed on a side of the liquid crystal display panel 100 close to the light guide plate 820, and the second polarizer 300 is disposed on a side of the liquid crystal display panel 100 away from the light guide plate 820.
In this embodiment, the first half-wave plate 400 is a phase retarder, which may be called a 1/2 λ -plate or simply a 1/2 wave plate, and has the following characteristics:
1. generating pi odd times of phase delay, and enabling the linearly polarized light to pass through the half wave plate and still be linearly polarized light;
2. if the included angle between the vibration direction of the incident linearly polarized light and the optical axis of the wave plate is alpha, the vibration direction of the emergent linearly polarized light rotates by 2 alpha degrees towards the direction of the optical axis.
In this embodiment, an included angle α between the vibration direction of the 0 ° linearly polarized light emitted by the first polarizer 200 and the 45 ° optical axis of the 1/2 wave plate is 45 °, and the polarization direction of the 0 ° linearly polarized light passes through the 1/2 wave plate and then is turned by 90 ° to become linearly polarized light with the polarization direction of 90 °. The present embodiment combines the first half-wave plate 400 and the first polarizer 200 to form an optical film layer with the same function as the "lower polarizer" in the conventional display panel 100 by utilizing the above characteristics of the 1/2 wave plate, so that the first polarizer 200 and the second polarizer 300 have the same absorption axis direction and the same size ratio, and further can be cut by the same cutting device for cutting wide width, thereby overcoming the problem that the current liquid crystal display screen cannot break through the oversized display field due to the wide width limitation of the polarizer.
Referring to fig. 2 and 3, in the lcd of the present application, the first half-wave plate 400 may include a plurality of stacked liquid crystal layers 700, and the liquid crystal layers 700 may include a plurality of liquid crystal molecules.
In this embodiment, a plurality of the liquid crystal molecules may form the liquid crystal film 700 by being combined with a polymer material, where the polymer material is a light-transmitting material.
Referring to fig. 3, in the present embodiment, a plurality of the liquid crystal molecules are arranged along the same direction, and an angle between the long axis of the liquid crystal molecules and the absorption axis of the first polarizer 200 is 45 °. Specifically, taking a space rectangular coordinate system formed by an x axis, a y axis and a z axis which are perpendicular to each other as an example for illustration, assuming that the directions of the absorption axes of the first polarizer 200 and the second polarizer 300 are in the same direction (or parallel) with the y axis in the xy plane, the included angle between the long axis direction of the liquid crystal molecules and the y axis is 45 ° (or 135 °) and the included angle between the long axis direction of the liquid crystal molecules and the x axis is also 45 ° (or 135 °).
In this embodiment, the first half-wave plate 400 is configured to include the liquid crystal film 700 formed by stacking multiple layers, so that the first half-wave plate 400 is a liquid crystal wave plate, and the liquid crystal wave plate can improve the light leakage phenomenon of visible light compared with the conventional 1/2 wave plate. Specifically, in this embodiment, the light intensity transmittance of the first polarizer 200, the combination a of the liquid crystal wave plate and the second polarizer 300, the combination B of the first polarizer 200, the conventional 1/2 wave plate and the second polarizer 300, and the combination C of the upper polarizing plate and the lower polarizing plate with the conventional absorption axes perpendicular to each other are tested, and the test results are shown in fig. 4.
As can be seen from fig. 4, after the visible light passes through the combination a, the combination B and the combination C, the parallel-state linearly polarized light having the polarization direction perpendicular to the absorption axis direction of the second polarizer 300 (or the upper polarizer) is transmitted, and the orthogonal-state linearly polarized light having the polarization direction parallel to the absorption axis direction of the second polarizer 300 (or the upper polarizer) is absorbed.
However, the light intensity transmittance of visible light with different wavelengths (the wavelength is 380 to 730 nanometers) passing through the combination a, the combination B and the combination C is also different to a certain extent, specifically:
(1) When the visible light wavelength is between 380 nanometers and 660 nanometers, the light intensity transmittance of parallel linearly polarized light of the combination A, the combination B and the combination C is very close; when the wavelength of visible light is between 660 nanometers and 730 nanometers, the light intensity transmittance of the parallel-state linearly polarized light of the combination C is highest, the light intensity transmittance of the parallel-state linearly polarized light of the combination B is inferior, and the light intensity transmittance of the parallel-state linearly polarized light of the combination C is lowest; when the wavelength of the light exceeds 730 nanometers, the transmittance difference of the parallel state linearly polarized light of the combination A, the combination B and the combination C is larger and larger.
(2) When the visible light wavelength is between 380 nanometers and 430 nanometers, the light intensity transmittance of the orthogonal linearly polarized light of the combination A, the combination B and the combination C is larger than 0, which indicates that the combination A, B, C has certain light leakage phenomenon for the orthogonal linearly polarized light with the wavelength between 380 nanometers and 430 nanometers; wherein, regarding the light intensity transmittance of orthogonal linearly polarized light with the wavelength of 380 nm to 430 nm, the combination A is larger than the combination B, and the combination B is larger than the combination C, which indicates that the light leakage prevention effect of the combination C is best, the combination B is inferior.
(3) When the wavelength of the light is between 660 nanometers and 730 nanometers, the light intensity transmittance of the orthogonal polarized light of the combination A, the combination B and the combination C is larger than or equal to 0, which indicates that the combination A, B, C has light leakage phenomena with different degrees for the orthogonal polarized light with the wavelength of 660 nanometers and 780 nanometers; wherein, regarding the light intensity transmittance of orthogonal linearly polarized light with the wavelength of 660-780 nm, the combination A is larger than the combination B, and the combination B is larger than the combination C, which indicates that the light leakage prevention effect of the combination C is best, the combination B is inferior.
As can be seen from the above, the light leakage phenomenon of the conventional 1/2 wave plate can be improved to a certain extent by adopting the liquid crystal wave plate in the embodiment, and the light transmission performance of the liquid crystal wave plate is very close to the light transmission performance of the upper polarizing plate and the lower polarizing plate with the absorption axes perpendicular to each other in the conventional liquid crystal display panel 100. Therefore, the embodiment can not only overcome the problem that the lower polarizing plate is difficult to cut and manufacture in an oversized size, but also improve the light leakage phenomenon, and achieve the optical effect almost the same as that of the upper polarizing plate and the lower polarizing plate with the absorption axes mutually perpendicular at the present stage.
On the other hand, the present embodiment can also improve the color shift problem of the conventional 1/2 wave plate by setting the first half wave plate 400 as a liquid crystal wave plate. Specifically, the conventional 1/2 wave plate has a wavelength dispersion characteristic, and after light with different wavebands exits through the 1/2 wave plate, the generated phase difference has a certain deviation, so that the polarization states of the light exiting from the 1/2 wave plate are different, and finally, the color cast phenomenon of a display picture is easily caused. As shown in fig. 5, fig. 5 is a schematic diagram of a conventional 1/2 wave plate for simulating the present embodiment to obtain a poincare sphere, according to which it is known that the polarization states of outgoing lights in different wavebands are different due to the wavelength dispersion characteristic of the conventional 1/2 wave plate, specifically, the polarization state of a green light waveband can completely reach a vertical polarization state, and a G point is represented on the poincare sphere as a G point on the equator; the rest of the red and blue bands are not perfectly linear due to the wavelength difference, and appear on the poincare sphere as corresponding R and B points, neither on the equator.
In this embodiment, by setting the first half-wave plate 400 as a liquid crystal wave plate, the color shift problem of the conventional 1/2 wave plate can be improved to a certain extent, so that the R point corresponding to red light and the B point corresponding to blue light are closer to the equator of the poincare sphere, i.e. the color shift degree is lighter.
Referring to fig. 6, in the lcd of the present application, the lcd may further include a second half-wave plate 500 and a third half-wave plate 600, wherein the second half-wave plate 500 is located at a side of the first half-wave plate 400 near the first polarizer 200, and the third half-wave plate 600 is located at a side of the first half-wave plate 400 far from the first polarizer 200.
In this embodiment, the included angle between the optical axis of the second half-wave plate 500 and the absorption axis of the first polarizer 200 may be smaller than the included angle between the optical axis of the first half-wave plate 400 and the absorption axis of the first polarizer 200, and the included angle between the optical axis of the third half-wave plate 600 and the absorption axis of the first polarizer 200 is larger than the included angle between the optical axis of the first half-wave plate 400 and the absorption axis of the first polarizer 200.
In this embodiment, by disposing the second half-wave plate 500 and the third half-wave plate 600 on two sides of the first half-wave plate 400, the first half-wave plate 400 cooperates with the second half-wave plate 500 and the third half-wave plate 600, so that the color shift problem existing when a single layer of the first half-wave plate 400 is disposed can be further improved. In order to better improve the color shift problem, both the second half-wave plate 500 and the third half-wave plate 600 may be liquid crystal plates, i.e. the second half-wave plate 500 and the third half-wave plate 600 may include the liquid crystal film 700 stacked in multiple layers.
In this embodiment, the sum of the included angle between the optical axis of the second half-wave plate 500 and the absorption axis of the first polarizer 200 and the included angle between the optical axis of the third half-wave plate 600 and the absorption axis of the first polarizer 200 may be an odd multiple of 90 °. For example, the angle between the optical axis of the second half-wave plate 500 and the absorption axis of the first polarizer 200 may be 11 °, and the angle between the optical axis of the third half-wave plate 600 and the absorption axis of the first polarizer 200 may be 79 °. In other embodiments, the included angle between the optical axis of the second half-wave plate 500 and the absorption axis of the first polarizer 200, and the included angle between the optical axis of the third half-wave plate 600 and the absorption axis of the first polarizer 200 may be other acute angles greater than 0 ° and less than 90 °, so long as the sum of the two is equal to 90 °, which is not described herein.
Referring to fig. 7, in the present embodiment, fig. 7 is a schematic diagram of a "poincare sphere" obtained by simulating the first half-wave plate 400 with an optical axis of 45 °, the second half-wave plate 500 with an optical axis of 11 °, and the third wave plate with an optical axis of 79 ° in the present embodiment. According to the figure, in this embodiment, after the green light band, the red light band and the blue light band are screened by the three-layer liquid crystal waveplates, the polarization states of the three-layer liquid crystal waveplates can almost reach the complete vertical polarization state, and the three points are R, G, B on the equator on the poincare sphere. Therefore, the color shift problem can be further improved on the basis of the single-layer liquid crystal wave plate by the arrangement.
Referring to fig. 3, in the lcd of the present application, the liquid crystals in the display panel 100 are vertically aligned, the number of the liquid crystal layers 700 is greater than or equal to 11 and less than or equal to 13, and the number of the liquid crystal layers 700 in the first half-wave plate 400, the second half-wave plate 500, and the third half-wave plate 600 may be greater than or equal to 11 and less than or equal to 13. In this embodiment, the liquid crystals in the display panel 100 are vertically aligned liquid crystals, that is, the display panel 100 is a VA mode liquid crystal display panel 100, and when the number of the liquid crystal film layers 700 in the first half-wave plate 400, the second half-wave plate 500, and the third half-wave plate 600 is between 11 layers and 13 layers, the VA mode liquid crystal display panel 100 has higher light intensity transmittance, less color cast phenomenon, and better display effect.
In this embodiment, the number of the liquid crystal film layers 700 in the first half-wave plate 400, the second half-wave plate 500, and the third half-wave plate 600 may be 11, so that the VA mode liquid crystal display panel 100 achieves an optimal display effect.
In the liquid crystal display screen of the present application, the liquid crystal molecules have a first refractive index no for ordinary rays and a second refractive index ne for extraordinary rays. The refractive index no may be understood as a refractive index of the liquid crystal molecules with respect to an ordinary ray (o-ray) whose direction of the vibration of the photoelectric vector is perpendicular to the crystal optical axis, and the refractive index ne may be understood as a refractive index of the liquid crystal molecules with respect to an extraordinary ray (extraordinary ray, e-ray) whose direction of the vibration of the photoelectric vector is parallel to the crystal optical axis.
In this embodiment, the first refractive index and the second refractive index may satisfy Δn×d= (2a+1) λ/2, where Δn is a difference between the second refractive index and the first refractive index, i.e., Δn=ne-no; d is the thickness of the first half-wave plate 400 in the lamination direction of the plurality of liquid crystal film layers 700; lambda is the wavelength of visible light, and a is an integer greater than or equal to 0.
In this embodiment, the difference between the second refractive index and the first refractive index may be 0.09 to 0.11, i.e. Δn=ne-no, and Δn is between 0.09 and 0.11.
In the present embodiment, in the lamination direction of the plurality of liquid crystal film layers 700, the thickness of the first half-wave plate 400, the second half-wave plate 500, and the thickness d of the third half-wave plate 600 may be 2.5 micrometers to 2.7 micrometers.
In this embodiment, the first half-wave plate 400, the second half-wave plate 500 and the third half-wave plate 600 are manufactured by using the liquid crystal molecules with the above parameters, and the first half-wave plate 400, the second half-wave plate 500 and the third half-wave plate 600 are combined with the first polarizer 200 and the second polarizer 300 to achieve better optical effects and more remarkable improved display effects by matching with the number of layers of the liquid crystal film 700 and the proper thickness of the wave plates.
According to the application, the first polarizer 200 with the absorption axis parallel to the absorption axis of the second polarizer 300 is arranged on the light incident side of the display panel 100, and the first half-wave plate 400 with the optical axis at an angle of 45 degrees with the absorption axis of the first polarizer 200 is arranged on the side, close to the second polarizer 300, of the first polarizer 200, so that the combined effect of the first polarizer 200 and the first half-wave plate 400 is the same as that of a lower side polarizing plate with the absorption axis perpendicular to the absorption axis of an upper side polarizing plate in a conventional liquid crystal display screen, the problem that the current liquid crystal display screen cannot break through the oversized display field due to the wide limit of the polarizing plates can be overcome, and meanwhile, the light leakage and color cast phenomenon can be further reduced and the display quality is improved by arranging the 1/2 wave plate as the liquid crystal wave plate.
The foregoing has described in detail a liquid crystal display provided by embodiments of the present application, and specific examples have been set forth herein to illustrate the principles and embodiments of the present application, the above description of embodiments being only for aiding in the understanding of the method of the present application and its core ideas; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.
Claims (5)
1. A liquid crystal display, comprising:
a display panel;
the first polaroid is arranged on the light incident side of the display panel;
the second polaroid is arranged on the light emitting side of the display panel; and
the first half wave plate is arranged on one side of the first polaroid, which is close to the second polaroid;
the second half-wave plate is positioned on one side of the first half-wave plate, which is close to the first polaroid, and the third half-wave plate is positioned on one side of the first half-wave plate, which is far away from the first polaroid;
the absorption axis of the first polaroid is parallel to the absorption axis of the second polaroid, and an included angle between the optical axis of the first half-wave plate and the absorption axis of the first polaroid is 45 degrees;
the included angle between the optical axis of the second half-wave plate and the absorption axis of the first polaroid is smaller than the included angle between the optical axis of the first half-wave plate and the absorption axis of the first polaroid, and the included angle between the optical axis of the third half-wave plate and the absorption axis of the first polaroid is larger than the included angle between the optical axis of the first half-wave plate and the absorption axis of the first polaroid;
the first half-wave plate, the second half-wave plate and the third half-wave plate comprise a plurality of liquid crystal film layers which are arranged in a laminated mode, the liquid crystal film layers comprise a plurality of liquid crystal molecules, the liquid crystal molecules have a first refractive index and a second refractive index, the first refractive index is a refractive index for ordinary rays, and the second refractive index is a refractive index for extraordinary rays;
the display panel comprises a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate and the second substrate are oppositely arranged, and the liquid crystal layer is arranged between the first substrate and the second substrate; the liquid crystals in the liquid crystal layer are vertically arranged liquid crystals, the number of the liquid crystal film layers of the first half-wave plate, the second half-wave plate and the third half-wave plate is more than or equal to 11 and less than or equal to 13, and the thicknesses of the first half-wave plate, the second half-wave plate and the third half-wave plate can be 2.5 micrometers to 2.7 micrometers;
wherein the difference between the second refractive index and the first refractive index is 0.09 to 0.11.
2. The liquid crystal display according to claim 1, wherein,
wherein a plurality of the liquid crystal molecules are arranged along the same direction, and an included angle between a long axis of the liquid crystal molecules and an absorption axis of the first polarizer is 45 degrees.
3. The liquid crystal display according to claim 1, wherein a sum of an included angle between an optical axis of the second half-wave plate and an absorption axis of the first polarizer and an included angle between an optical axis of the third half-wave plate and an absorption axis of the first polarizer is 90 °.
4. A liquid crystal display according to claim 3, wherein the angle between the optical axis of the second half-wave plate and the absorption axis of the first polarizer is 11 °, and the angle between the optical axis of the third half-wave plate and the absorption axis of the first polarizer is 79 °.
5. The liquid crystal display according to claim 2, wherein the first refractive index and the second refractive index satisfy Δn= (2a+1) λ/2, Δn is a difference between the second refractive index and the first refractive index, d is a thickness of the first half-wave plate in a lamination direction of the plurality of liquid crystal film layers, λ is a wavelength of visible light, and a is an integer greater than or equal to 0.
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| CN202210836858.6A CN115185123B (en) | 2022-07-15 | 2022-07-15 | Liquid crystal display |
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