CN108303830A - A kind of display panel of horizontal electric field type, its production method and display device - Google Patents
A kind of display panel of horizontal electric field type, its production method and display device Download PDFInfo
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- CN108303830A CN108303830A CN201810150986.9A CN201810150986A CN108303830A CN 108303830 A CN108303830 A CN 108303830A CN 201810150986 A CN201810150986 A CN 201810150986A CN 108303830 A CN108303830 A CN 108303830A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 230000005684 electric field Effects 0.000 title claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 152
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 149
- 230000003287 optical effect Effects 0.000 claims abstract description 48
- 125000006850 spacer group Chemical group 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 230000010287 polarization Effects 0.000 abstract description 45
- 239000011521 glass Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000031700 light absorption Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- PUAQLLVFLMYYJJ-UHFFFAOYSA-N 2-aminopropiophenone Chemical compound CC(N)C(=O)C1=CC=CC=C1 PUAQLLVFLMYYJJ-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 1
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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
-
- 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
-
- 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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/02—Number of plates being 2
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Abstract
The invention discloses a kind of display panel of horizontal electric field type, its production method and display devices, the first compensation of setting film layer between opposite substrate and array substrate, the phase difference of the first compensation film layer and the integral multiple that the sum of the phase difference of liquid crystal layer is lambda1-wavelength, and the initial optical axis direction of optical axis direction and the liquid crystal molecule in liquid crystal layer is mutually parallel.Optical anisotropy is generated in the case where opposite substrate and array substrate are by non-homogeneous external force, when transmitted light polarization state being caused to change, first compensation film layer can compensate for the phase delay that polarised light passes through liquid crystal layer, make light after opposite substrate, array substrate, liquid crystal layer and the first compensation film layer, its total phase delay is close or equal to the integral multiple of lambda1-wavelength, and then the light is made to be restored to original polarization state to a certain extent.In this way, when in dark-state, the overwhelming majority in light cannot be projected from display panel, so as to improve dark-state leakage problem.
Description
Technical Field
The invention relates to the technical field of display, in particular to a horizontal electric field type display panel, a manufacturing method thereof and a display device.
Background
In the related art, a Liquid Crystal Display (LCD) panel is often used as a display device. When the horizontally aligned liquid crystal display panel is bent to display in various ways or pressed to bear force, stress is generated on upper and lower substrate substrates, namely an opposite substrate and an array substrate, of the display panel to a greater or lesser extent, so that the substrate substrates generate optical anisotropy, and when polarized light penetrates through the optically anisotropic substrate substrates, the polarization state of the polarized light is changed, so that the display panel generates light leakage in different degrees in a dark state.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a horizontal electric field type display panel, a manufacturing method thereof and a display device, so as to alleviate the problem of light leakage in a dark state of the display panel in which the liquid crystal is horizontally placed in an initial state.
Accordingly, an embodiment of the present invention provides a display panel, including: the liquid crystal display panel comprises an opposite substrate, an array substrate, a liquid crystal layer and a first compensation film layer, wherein the opposite substrate and the array substrate are oppositely arranged, the liquid crystal layer is positioned between the opposite substrate and the array substrate, and the first compensation film layer is positioned between the opposite substrate and the array substrate; wherein,
the optical axis direction of the first compensation film layer is parallel to the initial optical axis direction of liquid crystal molecules in the liquid crystal layer;
the sum of the phase difference of the first compensation film layer and the phase difference of the liquid crystal layer is integral multiple of the wavelength of incident light.
In a possible implementation manner, in the display panel provided by the embodiment of the present invention, the phase difference of the first compensation film layer is equal to the phase difference of the liquid crystal layer.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the first compensation film layer is a + a compensation film layer.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the display panel further includes: the color film layer is positioned on one side, facing the liquid crystal layer, of the opposite substrate, and the spacer layer is positioned on one side, facing the liquid crystal layer, of the color film layer;
the first compensation film layer is located between the color film layer and the spacer layer as a flat layer.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the display panel further includes: and the second compensation film layer is used for compensating the phase delay of the non-axial light and is positioned on the light emitting sides of the liquid crystal layer and the first compensation film layer.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the second compensation layer is a + C compensation film layer or a-C compensation film layer.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the first compensation film layer and the second compensation film layer are located on the same side of the liquid crystal layer, and the second compensation film layer is located on a side of the first compensation film layer away from the liquid crystal layer.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the second compensation film layer is located on a side of the opposite substrate facing the liquid crystal layer; or the second compensation film layer is positioned on one side of the opposite substrate, which is far away from the liquid crystal layer.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the display panel further includes: the color film layer is positioned on one side, facing the liquid crystal layer, of the opposite substrate, and the spacer layer is positioned on one side, facing the liquid crystal layer, of the color film layer;
the second compensation film layer is positioned between the color film layer and the spacer layer as a flat layer; the first compensation film layer is located between the second compensation layer and the spacer.
In a possible implementation manner, in the display panel provided by the embodiment of the present invention, the thickness of the planarization layer is 0.8 μm to 2.5 μm.
In one possible implementation manner, in the display panel provided by the embodiment of the present invention, the viscosity of the flat layer before curing is 1.0mpa/s to 50 mpa/s.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the first compensation film layer and the second compensation film layer are located on different sides of the liquid crystal layer.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the first compensation film layer is located on a side of the array substrate facing the liquid crystal layer;
the second compensation film layer is positioned on one side of the opposite substrate facing the liquid crystal layer; or the second compensation film layer is positioned on one side of the opposite substrate, which is far away from the liquid crystal layer.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the first compensation film layer and the second compensation film layer are liquid crystal films.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the display panel further includes: and the alignment layer is positioned on one side of the first compensation film layer, which is far away from the liquid crystal layer, and is adjacent to the first compensation film layer.
On the other hand, an embodiment of the present invention further provides a display device, including: the embodiment of the invention provides the display panel of the horizontal electric field type.
On the other hand, the embodiment of the invention also provides a manufacturing method of the horizontal electric field type display panel, which comprises the following steps: providing a counter substrate and an array substrate, and filling a liquid crystal layer between the counter substrate and the array substrate; further comprising:
forming an alignment layer on the opposite substrate or the array substrate;
forming a first compensation film layer on the alignment layer; the optical axis direction of the first compensation film layer is parallel to the initial optical axis direction of liquid crystal molecules in the liquid crystal layer, and the sum of the phase difference of the first compensation film layer and the phase difference of the liquid crystal layer is integral multiple of the wavelength of incident light.
In a possible implementation manner, in the manufacturing method provided in an embodiment of the present invention, before forming an alignment layer on the opposite substrate or the array substrate, the method further includes:
and forming a second compensation film layer for compensating the phase delay of the non-axial light on the opposite substrate or the array substrate.
In a possible implementation manner, in the manufacturing method provided in an embodiment of the present invention, before forming the second compensation film layer on the opposite substrate, the method further includes: forming a color film layer on the opposite substrate;
the second compensation film layer is used as a flat layer;
after forming the first compensation film layer on the alignment layer, the method further comprises: and forming a spacer on the first compensation film layer.
The embodiment of the invention has the beneficial effects that:
in the display panel of the horizontal electric field type, the manufacturing method thereof and the display device provided by the embodiment of the invention, the first compensation film layer is arranged between the opposite substrate and the array substrate, the sum of the phase difference of the first compensation film layer and the phase difference of the liquid crystal layer is integral multiple of the wavelength of incident light, and the optical axis direction is parallel to the initial optical axis direction of liquid crystal molecules in the liquid crystal layer. When the polarization state of the transmitted light changes due to optical anisotropy generated under the condition that the opposite substrate and the array substrate are subjected to non-uniform external force, the first compensation film layer can compensate the phase delay of the polarized light passing through the liquid crystal layer, so that the total phase delay of the light after passing through the opposite substrate, the array substrate, the liquid crystal layer and the first compensation film layer is close to or equal to the integral multiple of the wavelength of the incident light, and the light is further restored to the original polarization state to a certain extent. Therefore, when the display panel is in a dark state, most of light cannot be emitted from the display panel, and the problem of dark-state light leakage is solved.
Drawings
FIG. 1 is a schematic diagram of a related art LCD panel;
FIG. 2 is a diagram illustrating the polarization state of transmitted light in Poincare spheres for each layer of a related art LCD panel;
fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a polarization state of transmitted light in Poincare spheres for each layer of a display panel according to an embodiment of the present invention;
FIG. 6 is another schematic diagram illustrating polarization states of transmitted light in Poincare spheres for layers of a display panel according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a display panel with a second compensation film layer according to an embodiment of the present invention;
FIG. 8 is a schematic view of another structure of a display panel with a second compensation film layer according to an embodiment of the present invention;
FIG. 9 is a schematic view of another structure of a display panel with a second compensation film layer according to an embodiment of the present invention;
FIG. 10 is a schematic view of another structure of a display panel with a second compensation film layer according to an embodiment of the present invention;
FIG. 11 is a schematic view of another structure of a display panel with a second compensation film layer according to an embodiment of the present invention;
FIG. 12 is a schematic view of another structure of a display panel with a second compensation film layer according to an embodiment of the present invention;
fig. 13 is another schematic diagram of polarization states of transmitted light in the poincare sphere of each layer of the display panel according to the embodiment of the invention.
Detailed Description
In-Plane Switching (IPS) and advanced super Dimension Switching (ADS) modes are common display modes for existing wide viewing angle liquid crystal display panels, and are also referred to as horizontal electric field type liquid crystal display panels.
Specifically, the ADS type LCD is taken as an example, and as shown in fig. 1, the ADS type LCD includes an opposite substrate 104 and an array substrate 102, and a liquid crystal layer 103 between the opposite substrate 104 and the array substrate 102. In order to ensure normal display, an upper polarizing plate 105 and a lower polarizing plate 101, whose light transmission axes are perpendicular to each other, are provided on the outer sides of the counter substrate 104 and the array substrate 102, respectively. Since the liquid crystal cannot emit light, the liquid crystal display panel also needs to be provided with a backlight (not shown in fig. 1). Light emitted from the backlight passes through the lower polarizer 101, the array substrate 102, the liquid crystal layer 103, the counter substrate 104, and the upper polarizer 105 in this order.
The initial state of the liquid crystal in the ADS type LCD is horizontally placed, and the liquid crystal has no twisting effect on light under the condition of no voltage, so that the polarization direction of the light passing through the liquid crystal is vertical to the light transmission axis direction of the upper polarizer 105, the light cannot transmit, a dark picture is displayed, and the ADS type LCD is in a dark state at this time; under the condition of voltage application, the liquid crystal molecules rotate to distort the light, so that the polarization direction of the light is changed, the light can be emitted through the upper polarizer 105, and a bright picture is displayed, and the ADS type LCD is in a bright state at this time.
Since the substrate substrates of the array substrate 102 and the opposite substrate 104 are generally formed of glass, the glass has a birefringent effect on light. When the display panel is bent or pressed to bear force, the glass is changed from an isotropic medium to an optical anisotropic medium under the condition of non-uniform external force, and the glass generates non-uniform stress birefringence due to different stress conditions, so that the polarization state of transmitted light is changed. The polarization states generated by the upper glass substrate and the lower glass substrate are equal in phase and opposite in direction, and in the absence of the liquid crystal layer 103, the polarization states generated by the upper and lower glass substrates can be cancelled out, but due to the existence of the liquid crystal layer 103, the phase difference is amplified, so that the polarization states generated by the upper and lower glass substrates cannot be cancelled out.
Specifically, fig. 2 shows a state in which the polarization state of light passing through each component of the display panel is in the poincare sphere in the dark state. A point on the poincare sphere represents a polarization state, the azimuth angle represents the longitude on the poincare sphere, and the ellipticity represents the latitude. Therefore, points on the equator of the Bojia sphere represent linearly polarized light, the upper and lower poles correspond to right-handed circularly polarized light and left-handed circularly polarized light respectively, and other points on the spherical surface correspond to elliptically polarized light, wherein the upper hemisphere is right-handed elliptically polarized light and the lower hemisphere is left-handed elliptically polarized light. The fully polarized light is shown on the sphere, the natural light is shown in the center of the sphere, and the partially polarized light is shown at other points within the sphere.
the polarization state of the light emitted by the backlight source when passing through the liquid crystal display panel is respectively that the light becomes linearly polarized light after passing through the lower polarizer 101, the light is positioned at the point ④, the polarization state of the light is changed after passing through the glass generating non-uniform stress, the linearly polarized light becomes elliptically polarized light, the light is positioned at the point ②, the elliptically polarized light with the optical axis not parallel to the optical axis of the liquid crystal is modulated by the liquid crystal to generate the change of the polarization state, the polarization state is positioned at the point III, the polarization state moves to the point IV and does not coincide with ① after passing through the glass generating non-uniform stress, and partial light can be transmitted out, so that the ADS type LCD has the problem of dark state light leakage.
Accordingly, embodiments of the present invention provide a display panel, a manufacturing method thereof and a display device, which are used to alleviate the problem of light leakage in a dark state of the existing horizontal electric field type liquid crystal display panel. In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
As shown in fig. 3 and 4, the horizontal electric field type display panel according to the embodiment of the present invention includes: the liquid crystal display panel comprises an opposite substrate 100 and an array substrate 200 which are oppositely arranged, a liquid crystal layer 300 positioned between the opposite substrate 100 and the array substrate 200, and a first compensation film layer 400 positioned between the opposite substrate 100 and the array substrate 200; wherein,
the optical axis direction of the first compensation film layer 400 and the initial optical axis direction of the liquid crystal molecules in the liquid crystal layer 300 are parallel to each other;
the sum of the phase difference of the first compensation film layer 400 and the phase difference of the liquid crystal layer 300 is an integral multiple of the wavelength of the incident light.
Specifically, in the display panel provided by the embodiment of the present invention, the first compensation film layer 400 is disposed between the opposite substrate 100 and the array substrate 200, the sum of the phase difference of the first compensation film layer 400 and the phase difference of the liquid crystal layer 300 is an integral multiple of the wavelength of the incident light, and the optical axis direction is parallel to the initial optical axis direction of the liquid crystal molecules in the liquid crystal layer 300. When the opposite substrate 100 and the array substrate 200 are subjected to non-uniform external force to generate optical anisotropy, and the polarization state of the transmitted light is changed, the first compensation film layer 400 can compensate the phase delay of the polarized light passing through the liquid crystal layer 300, so that the total phase delay of the light after passing through the opposite substrate 100, the array substrate 200, the liquid crystal layer 300 and the first compensation film layer 400 is close to or equal to the integral multiple of the wavelength of the incident light, and the light is restored to the original polarization state to a certain extent. Thus, when in the dark state, most of the light can not be emitted from the display panel in the horizontal orientation, thereby improving the problem of dark state light leakage.
Specifically, in the display panel provided by the embodiment of the present invention, the sum of the phase difference of the first compensation film layer 400 and the phase difference of the liquid crystal layer 300 is an integral multiple of the wavelength of the incident light, so as to ensure that the polarized light can return to the vicinity of the previous polarization state after being compensated by the phase difference of the first compensation film layer 400. The incident light wavelength may be a visible light wavelength range, the incident light wavelength may also be a monochromatic light wavelength commonly used by the display panel, such as a red light wavelength range, a green light wavelength range, a blue light wavelength range, and the like, and the incident light wavelength may also be a standard wavelength, such as 550nm, which is not limited herein.
The sum of the phase difference of the first compensation layer 400 and the phase difference of the liquid crystal layer 300 may not be strictly an integral multiple of the wavelength of the incident light, and may have a certain tolerance range, for example, the tolerance range is within ± 20%, which is within the protection scope of the present invention. Also, the optical axis direction of the first compensation film 400 and the initial optical axis direction of the liquid crystal molecules in the liquid crystal layer 300 may be parallel to each other within a certain tolerance range, for example, the tolerance range is within ± 11 °, which is within the protection scope of the present invention.
Optionally, in the display panel provided by the embodiment of the present invention, a sum of the phase difference of the first compensation film layer 400 and the phase difference of the liquid crystal layer 300 is an integer multiple of the wavelength of the incident light, where the integer multiple may be 1, that is, the phase difference of the first compensation film layer 400 may be equal to the phase difference of the liquid crystal layer 300. Thus, the thickness of the first compensation film 400 can be reduced as much as possible, which is beneficial to the manufacture of the first compensation film 400 and the overall thinning of the module.
for example, the phase difference of the first compensation film 400 is λ -340nm, and the phase difference of the liquid crystal layer 300 is 340nm, at this time, as shown in fig. 5, the polarization state of the light emitted by the backlight source in the dark state on the poincare respectively that the light becomes linearly polarized light after passing through the lower polarizer, at this time, the polarization state of the light changes after passing through the array substrate 200 generating the non-uniform stress, the linearly polarized light becomes elliptically polarized light, at this time, the elliptically polarized light is located at the position, the optical axis of which is not parallel to the optical axis of the liquid crystal is modulated by the liquid crystal, the change of the polarization state occurs, the polarization state is located at position ④, after passing through the first compensation layer 400, the sum of the phase difference and the phase difference of the liquid crystal layer 300 is λ, the previous additionally generated phase difference is compensated, the compensated polarization state is located at position ④, when the opposite substrate 100 generating the non-uniform stress is further experienced, the polarization state moves to the position ⑤, and the opposite substrate 100 and the optical anisotropy is generated, and the problem of the opposite substrate 100 and the array substrate 200 is not covered by the non-uniform external force.
optionally, in the display panel provided in the embodiment of the present invention, the sum of the phase difference of the first compensation film 400 and the phase difference of the liquid crystal layer 300 is an integral multiple of the wavelength of incident light, for example, the phase difference of the first compensation film 400 may be 2 × λ -340nm, and the phase difference of the liquid crystal layer 300 may be 340nm, at this time, as shown in fig. 6, the polarization state of light emitted from the backlight in the dark state passing through the display panel is changed from linearly polarized light to elliptically polarized light in the process of passing through the lower polarizer, at this time, the polarization state is changed at point (④), after passing through the array substrate 200 generating non-uniform stress, the polarization state of light is changed from linearly polarized light to elliptically polarized light, at this time, after passing through the first compensation layer 400 having an optical axis not parallel to the optical axis of the liquid crystal, the elliptically polarized light is modulated by the liquid crystal, the polarization state is changed, the polarization state is at point (iii), after passing through the first compensation layer 400 having an optical axis not parallel to the optical axis, the sum of the phase difference of the liquid crystal layer 300, the first compensation layer, the phase is rotated around the center of the sphere (④), the first compensation, the circularly polarized light is changed, the polarization state is changed, after passing through the first compensation.
Specifically, in the display panel provided by the embodiment of the invention, the retardation of the first compensation film 400 is generally selected to be in the range of 100nm to 400 nm.
Optionally, in the display panel provided in the embodiment of the invention, the first compensation film layer 400 may be a + a compensation film layer, which is also called a + a plate, and satisfies nx1 > ny1 ═ nz1, where nx1 is a refractive index in an X-axis direction in a plane of the + a compensation film layer, ny1 is a refractive index in a Y-axis direction perpendicular to the X-axis in the plane of the + a compensation film layer, and nz1 is a refractive index in a thickness direction of the + a compensation film layer.
Specifically, + A compensates for the in-plane phase retardation R of the film layer+A(nx-ny) d1, wherein d1 is the thickness of the + a compensation film layer. In-plane phase retardation R of liquid crystal layer 300LC＝(ne-n0) D2, wherein d2 is the thickness of the liquid crystal layer 300, neIs the refractive index of the very light,n0is the refractive index of ordinary light. Adjusting the relevant parameters of the film layer by + A compensation so that R+A-RLCM λ, m 0, ± 1, ± 2 … …, i.e. satisfying (nx1-ny1) × d1 ═ ne-n0) D2+ m λ. Thus, when the optical axis direction of the + a compensation film layer and the long axis direction of the liquid crystal molecules in the initial state are parallel to each other, it can compensate the in-plane phase retardation generated by the light passing through the liquid crystal layer 300. The optical axis direction of the + A compensation film layer is the direction in which the refraction directions of the o light and the e light generated after the light passes through the + A compensation film layer are coincident.
Optionally, in the display panel provided in the embodiment of the present invention, as shown in fig. 3, the first compensation film 400 may be located on a side of the array substrate 200 facing the liquid crystal layer 300; alternatively, as shown in fig. 4, the first compensation film 400 may also be located on a side of the opposite substrate 100 facing the liquid crystal layer 300, which is not limited herein.
Optionally, in the display panel provided in the embodiment of the present invention, as shown in fig. 4, the display panel may further include: the color film layer 110 is positioned on one side of the opposite substrate 100 facing the liquid crystal layer 300, and the spacer layer 130 is positioned on one side of the color film layer 110 facing the liquid crystal layer 300; the first compensation film layer 400 can be reused as the planarization layer 120 between the color film layer 110 and the spacer layer 130.
Specifically, when the first compensation film 400 is located on the side of the opposite substrate 100 facing the liquid crystal layer 300, the first compensation film 400 is reused as the planarization layer 120, which can simplify the complexity of the process flow and is beneficial to saving the manufacturing cost.
Optionally, in the display panel provided in the embodiment of the present invention, in order to ensure that the first compensation film layer 400 multiplexed as the planarization layer 120 can perform a planarization function, i.e. fill up the unevenness on the upper surface of the color film layer 110, the thickness of the first compensation film layer 400 is required to be in a range of 0.8 μm to 2.5 μm, so as to ensure that the planarization function can be performed. In addition, the viscosity of the first compensation film 400 before curing is required to be in the range of 1.0mpa/s to 50mpa/s to ensure the fluidity of the first compensation film 400, and the first compensation film can be filled into the uneven gaps to achieve the planarization effect.
Specifically, since the light absorption axes of the upper and lower polarizing plates of the display panel are perpendicular to each other, the light absorption axes of the upper and lower polarizing plates 22 and 22 are perpendicular to each other when the display panel is viewed from an axial direction (the axial direction means a direction perpendicular to the display screen); however, when the display panel is viewed from a non-axial direction (the non-axial direction is a direction not perpendicular to the display screen), that is, from an off-axis large viewing angle state, due to an increase in viewing angle, the light absorption axes of the original orthogonal polarizers may be shifted, that is, the light absorption axes of the upper polarizer and the lower polarizer are not perpendicular to each other, which may cause a problem of a small non-axial viewing angle range, light leakage, and the like, and finally affect the viewing effect.
In order to improve the light leakage problem in the off-axis large viewing angle state, as shown in fig. 7 to 12, the display panel provided in the embodiment of the present invention may further include: and a second compensation film 500 for compensating the phase retardation of the non-axial light, wherein the second compensation film 500 is located on the light-emitting sides of the liquid crystal layer 300 and the first compensation film 400. If the array substrate 200 is used as the light incident side and the opposite substrate 100 is used as the light emitting side, the second compensation film 500 is closer to the opposite substrate 100 than the liquid crystal layer 300 and the first compensation film 400, i.e. the light passes through the second compensation film 500 after passing through the liquid crystal layer 300 and the first compensation film 400.
specifically, as shown in fig. 13, the polarization state of the light emitted from the backlight source in the off-axis large viewing angle when the light passes through the display panel in the dark state is changed to a certain degree when the light passes through the lower polarizer, the array substrate 200 and the liquid crystal layer 300, the polarization state is at the point ②, the polarization state is changed to a large degree when the light passes through the first compensation film 400 and is at the point ii, the polarization state is improved by the second compensation film 500, the polarization state moves to the point iii, the point iii is almost orthogonal to the light absorption axis direction of the upper polarizer, the emitted light is completely absorbed by the upper polarizer, and the dark state light leakage problem in the off-axis large viewing angle state is not generated, therefore, the second compensation film 500 is matched with the first compensation film 400, the polarization state of the non-axial emitted light can be compensated, and the purpose of improving the dark state of the non-axial viewing angle is achieved.
Optionally, in the display panel provided in the embodiment of the present invention, the second compensation film layer 500 may be a + C compensation film layer, which is also called a + C plate, and satisfies nz2 > ny2 ═ nx2, where nx2 is a refractive index in an X-axis direction in the optical compensation film plane, ny2 is a refractive index in a Y-axis direction perpendicular to the X-axis in the optical compensation film plane, and nz2 is a refractive index in a thickness direction of the optical compensation film; alternatively, the second compensation film layer 500 may be a-C compensation film layer, also called a-C plate, satisfying nz3< ny3 ═ nx3, where nx3 is a refractive index in an X-axis direction in the optical compensation film plane, ny3 is a refractive index in a Y-axis direction perpendicular to the X-axis in the optical compensation film plane, and nz3 is a refractive index in a thickness direction of the optical compensation film.
Specifically, the thickness phase retardation Rth ═ of + C compensation film layer [ (nx2+ ny2)/2-nz2] × d3, where d3 is the thickness of + C compensation film layer. Since the + C compensation film layer satisfies nz2 > ny2 ═ nx2, the in-plane phase retardation R + C thereof is 0, that is, the + C compensation film layer has zero in-plane phase retardation and has a phase retardation in the thickness direction. The thickness phase retardation Rth ═ of [ (nx3+ ny3)/2-nz3] × d4 of the C compensation film layer, wherein d4 is the thickness of the C compensation film layer. Since the-C compensation film layer satisfies nz3< ny3 ═ nx3, the in-plane phase retardation R + C thereof is 0, that is, the-C compensation film layer has zero in-plane phase retardation and has a phase retardation in the thickness direction.
Specifically, the second compensation film 500 has no in-plane retardation, so that the optical axis direction thereof is not required, and the retardation can be oriented in any direction, and the thickness retardation Rth thereof can be selected from 50nm to 200 nm.
Optionally, in the display panel provided in the embodiment of the present invention, as shown in fig. 7 and fig. 8, the first compensation film 400 and the second compensation film 500 may be located on the same side of the liquid crystal layer 300, and the second compensation film 500 is located on a side of the first compensation film 400 facing away from the liquid crystal layer 300.
Specifically, the first compensation film 400 and the second compensation film 500 are disposed on the opposite substrate 100 at a side facing the liquid crystal layer 300, that is, the first compensation film 400 and the second compensation film 500 are formed on the opposite substrate 100, which is beneficial to the manufacturing process.
Alternatively, in the display panel provided in the embodiment of the invention, as shown in fig. 7, the second compensation film layer 500 may be located on a side of the opposite substrate 100 facing the liquid crystal layer 300, that is, on an inner side of the opposite substrate 100; alternatively, as shown in fig. 8, the second compensation film 500 may also be located on a side of the opposite substrate 100 away from the liquid crystal layer 300, that is, on an outer side of the opposite substrate 100, for example, the second compensation film 500 may also be disposed in the upper polarizer.
Optionally, in the display panel provided in the embodiment of the present invention, as shown in fig. 7, the display panel may further include: the color film layer 110 is positioned on one side of the opposite substrate 100 facing the liquid crystal layer 300, and the spacer layer 130 is positioned on one side of the color film layer 110 facing the liquid crystal layer 300; the second compensation film layer 500 can be reused as the flat layer 120 between the color film layer 110 and the spacer layer 130; the first compensation film layer 400 is located between the second compensation layer 500 and the spacer layer 130.
Specifically, when the second compensation film 500 is located on the inner side of the opposite substrate 100, the second compensation film 500 is reused as the planarization layer 120, which can simplify the complexity of the process flow and is beneficial to saving the manufacturing cost.
Alternatively, in the display panel provided in the embodiment of the present invention, as shown in fig. 9 and 10, the first compensation film layer 400 and the second compensation film layer 500 may also be located on different sides of the liquid crystal layer 300.
Alternatively, in the display panel provided in the embodiment of the present invention, as shown in fig. 9 and 10, the first compensation film layer 400 may be located on a side of the array substrate 200 facing the liquid crystal layer 300;
as shown in fig. 9, the second compensation film 500 may be located on a side of the opposite substrate 100 facing the liquid crystal layer 300, that is, on an inner side of the opposite substrate 100; alternatively, as shown in fig. 10, the second compensation film 500 may also be located on a side of the opposite substrate 100 away from the liquid crystal layer 300, that is, on an outer side of the opposite substrate 100, for example, the second compensation film 500 may also be disposed in the upper polarizer.
Specifically, when the second compensation film 500 is located on the inner side of the opposite substrate 100, the second compensation film 500 can be reused as a planarization layer, which simplifies the complexity of the process flow and is beneficial to saving the manufacturing cost.
Optionally, in the display panel provided in the embodiment of the present invention, in order to ensure that the second compensation film 500 multiplexed as the planarization layer 120 can perform a planarization function, i.e. fill up the unevenness on the upper surface of the color film 110, the thickness of the second compensation film 500 is required to be in a range of 0.8 μm to 2.5 μm, so as to ensure that the planarization function can be performed. In addition, the viscosity of the second compensation film 500 before curing is required to be in the range of 1.0mpa/s to 50mpa/s to ensure the fluidity of the second compensation film 500, and the second compensation film can be filled into the uneven gaps to achieve the planarization effect.
Optionally, in the display panel provided in the embodiment of the present invention, the first compensation film layer 400 and the second compensation film layer 500 may be liquid crystal films, so as to reduce the manufacturing cost. Of course, the first compensation film 400 and the second compensation film 500 may be made of other materials, and are not limited herein. Note that, when both the first compensation film layer 400 and the second compensation film layer 500 are liquid crystal films, their initial orientations are not changed once determined, unlike the case of the liquid crystal layer 300 in the display panel.
Optionally, in the display panel provided in the embodiment of the present invention, in order to ensure that the optical axis direction of the first compensation film layer 400 is perpendicular to the initial optical axis direction of the liquid crystal molecules in the liquid crystal layer 300, as shown in fig. 11 and 12, the method may further include: the alignment layer 410 is disposed on a side of the first compensation film 400 away from the liquid crystal layer 300 and adjacent to the first compensation film 400. Alternatively, a liquid crystal film with an alignment direction may be used as the first compensation film 400, and the alignment layer 410 is omitted, so as to simplify the manufacturing process.
Specifically, as shown in fig. 11, when the first compensation film 400 is located on the side of the array substrate 200 facing the liquid crystal layer 300, the alignment layer 410 is located between the first compensation film 400 and the array substrate 200; as shown in fig. 12, when the first compensation film 400 is located on the side of the opposite substrate 100 facing the liquid crystal layer 300, the alignment layer 410 is located between the first compensation film 400 and the opposite substrate 100.
Based on the same inventive concept, the embodiment of the invention also provides a manufacturing method of the horizontal electric field type display panel, which comprises the following steps: providing a counter substrate and an array substrate, and filling a liquid crystal layer between the counter substrate and the array substrate; further comprising:
forming an alignment layer on the opposite substrate or the array substrate;
forming a first compensation film layer on the alignment layer; the optical axis direction of the first compensation film layer is parallel to the initial optical axis direction of liquid crystal molecules in the liquid crystal layer, and the sum of the phase difference of the first compensation film layer and the phase difference of the liquid crystal layer is integral multiple of the wavelength of incident light.
Optionally, in the manufacturing method provided in the embodiment of the present invention, before forming the alignment layer on the opposite substrate or the array substrate, the method further includes:
and forming a second compensation film layer for compensating the phase delay of the non-axial light on the opposite substrate or the array substrate.
Optionally, in the manufacturing method provided in the embodiment of the present invention, before forming the second compensation film layer on the opposite substrate, the method further includes: forming a color film layer on the opposite substrate;
the second compensation film layer is used as a flat layer;
after the first compensation film layer is formed on the alignment layer, the method further comprises the following steps: and forming a spacer on the first compensation film layer.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the horizontal electric field type display panel provided in the embodiment of the present invention, where the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. The implementation of the display device can be seen in the above-mentioned embodiment of the horizontal electric field type display panel, and repeated descriptions are omitted.
In the display panel of the horizontal electric field type, the manufacturing method thereof and the display device provided by the embodiment of the invention, the first compensation film layer is arranged between the opposite substrate and the array substrate, the sum of the phase difference of the first compensation film layer and the phase difference of the liquid crystal layer is integral multiple of the wavelength of incident light, and the optical axis direction is parallel to the initial optical axis direction of liquid crystal molecules in the liquid crystal layer. When the polarization state of the transmitted light changes due to optical anisotropy generated under the condition that the opposite substrate and the array substrate are subjected to non-uniform external force, the first compensation film layer can compensate the phase delay of the polarized light passing through the liquid crystal layer, so that the total phase delay of the light after passing through the opposite substrate, the array substrate, the liquid crystal layer and the first compensation film layer is close to or equal to the integral multiple of the wavelength of the incident light, and the light is further restored to the original polarization state to a certain extent. Therefore, when the display panel is in a dark state, most of light cannot be emitted from the display panel, and the problem of dark-state light leakage is solved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (19)
1. A display panel of a horizontal electric field type, comprising: the liquid crystal display panel comprises an opposite substrate, an array substrate, a liquid crystal layer and a first compensation film layer, wherein the opposite substrate and the array substrate are oppositely arranged, the liquid crystal layer is positioned between the opposite substrate and the array substrate, and the first compensation film layer is positioned between the opposite substrate and the array substrate; wherein,
the optical axis direction of the first compensation film layer is parallel to the initial optical axis direction of liquid crystal molecules in the liquid crystal layer;
the sum of the phase difference of the first compensation film layer and the phase difference of the liquid crystal layer is integral multiple of the wavelength of incident light.
2. The display panel of claim 1, wherein a sum of the phase difference of the first compensation film layer and the phase difference of the liquid crystal layer is a wavelength of an incident light.
3. The display panel of claim 1, wherein the first compensation film layer is a + a compensation film layer.
4. The display panel of claim 1, further comprising: the color film layer is positioned on one side, facing the liquid crystal layer, of the opposite substrate, the flat layer is positioned on one side, facing the liquid crystal layer, of the color film layer, and the spacer layer is positioned on one side, facing the liquid crystal layer, of the flat layer;
the first compensation film layer is located between the color film layer and the spacer layer as a flat layer.
5. The display panel of claim 1, further comprising: and the second compensation film layer is used for compensating the phase delay of the non-axial light and is positioned on the light emitting sides of the liquid crystal layer and the first compensation film layer.
6. The display panel of claim 5, wherein the second compensation layer is a + C compensation film layer or a-C compensation film layer.
7. The display panel of claim 5, wherein the first compensation film layer and the second compensation film layer are on a same side of the liquid crystal layer, and the second compensation film layer is on a side of the first compensation film layer facing away from the liquid crystal layer.
8. The display panel according to claim 7, wherein the second compensation film layer is located on a side of the opposite substrate facing the liquid crystal layer; or the second compensation film layer is positioned on one side of the opposite substrate, which is far away from the liquid crystal layer.
9. The display panel according to claim 8, further comprising: the color film layer is positioned on one side, facing the liquid crystal layer, of the opposite substrate, and the spacer layer is positioned on one side, facing the liquid crystal layer, of the color film layer;
the second compensation film layer is positioned between the color film layer and the spacer layer as a flat layer; the first compensation film layer is located between the second compensation layer and the spacer layer.
10. The display panel according to claim 4 or 9, wherein the planarization layer has a thickness of 0.8 μm to 2.5 μm.
11. The display panel according to claim 4 or 9, wherein the viscosity of the planarization layer before curing is 1.0mpa/s to 50 mpa/s.
12. The display panel of claim 7, wherein the first compensation film layer and the second compensation film layer are on different sides of the liquid crystal layer.
13. The display panel of claim 7, wherein the first compensation film layer is located on a side of the array substrate facing the liquid crystal layer;
the second compensation film layer is positioned on one side of the opposite substrate facing the liquid crystal layer; or the second compensation film layer is positioned on one side of the opposite substrate, which is far away from the liquid crystal layer.
14. The display panel of claim 5, wherein the first compensation film layer and the second compensation film layer are liquid crystal films.
15. The display panel according to claim 14, further comprising: and the alignment layer is positioned on one side of the first compensation film layer, which is far away from the liquid crystal layer, and is adjacent to the first compensation film layer.
16. A display device, comprising: the display panel of a horizontal electric field type as claimed in any one of claims 1 to 15.
17. A method for manufacturing a horizontal electric field type display panel includes: providing a counter substrate and an array substrate, and filling a liquid crystal layer between the counter substrate and the array substrate; it is characterized by also comprising:
forming an alignment layer on the opposite substrate or the array substrate;
forming a first compensation film layer on the alignment layer; the optical axis direction of the first compensation film layer is parallel to the initial optical axis direction of liquid crystal molecules in the liquid crystal layer, and the sum of the phase difference of the first compensation film layer and the phase difference of the liquid crystal layer is integral multiple of the wavelength of incident light.
18. The method of claim 17, further comprising, before forming an alignment layer on the counter substrate or the array substrate:
and forming a second compensation film layer for compensating the phase delay of the non-axial light on the opposite substrate or the array substrate.
19. The method of claim 18, wherein before forming the second compensation film layer on the opposite substrate, further comprising: forming a color film layer on the opposite substrate;
the second compensation film layer is used as a flat layer;
after forming the first compensation film layer on the alignment layer, the method further comprises: and forming a spacer on the first compensation film layer.
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| CN201810150986.9A CN108303830A (en) | 2018-02-13 | 2018-02-13 | A kind of display panel of horizontal electric field type, its production method and display device |
| CN201810996185.4A CN109445193A (en) | 2018-02-13 | 2018-08-29 | A kind of display panel of horizontal electric field type, its production method and display device |
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| CN201810150986.9A CN108303830A (en) | 2018-02-13 | 2018-02-13 | A kind of display panel of horizontal electric field type, its production method and display device |
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