CN107976848B - Liquid crystal display panel, determination method of anti-reflection layer of liquid crystal display panel and liquid crystal display - Google Patents
Liquid crystal display panel, determination method of anti-reflection layer of liquid crystal display panel and liquid crystal display Download PDFInfo
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- CN107976848B CN107976848B CN201711289697.9A CN201711289697A CN107976848B CN 107976848 B CN107976848 B CN 107976848B CN 201711289697 A CN201711289697 A CN 201711289697A CN 107976848 B CN107976848 B CN 107976848B
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
- G02F2201/121—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode common or background
Abstract
The invention discloses a liquid crystal display panel, a method for determining a antireflection layer of the liquid crystal display panel and a liquid crystal display. The liquid crystal display panel comprises an upper substrate, a lower substrate and a liquid crystal layer, wherein the upper substrate comprises a substrate, a common electrode layer and a light alignment layer which are sequentially stacked, and the upper surface or the lower surface of the common electrode layer is also provided with an antireflection layer. The method comprises the steps of obtaining the average reflectivity of a public electrode layer in a set waveband; adjusting the thickness and refractive index of the antireflection layer; acquiring the change condition of the average reflectivity caused by the change of the thickness and the refractive index of the antireflection layer; the thickness and the refractive index of the antireflection layer corresponding to the minimum value of the average reflectance are set as the thickness and the refractive index of the antireflection layer of the liquid crystal display panel. The thickness and the refractive index of the antireflection layer are adjusted, so that the reflectivity of the common electrode layer is reduced, and the contrast is enhanced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a liquid crystal display panel, a method for determining an anti-reflection layer of the liquid crystal display panel and a liquid crystal display.
Background
With the development of technology, the requirements of people for liquid crystal displays are higher and higher, and the contrast becomes a main index for improving the performance of the liquid crystal display. In order to improve the contrast of the liquid crystal display under strong ambient light, it is necessary to reduce the reflectance of the liquid crystal display to ambient light as much as possible.
Disclosure of Invention
The invention mainly solves the problem of providing a liquid crystal display panel, a method for determining a antireflection layer of the liquid crystal display panel and a liquid crystal display.
The technical scheme adopted by the invention is to provide a liquid crystal display panel, a method for determining a antireflection layer of the liquid crystal display panel and a liquid crystal display. The liquid crystal display panel comprises an upper substrate, a lower substrate and a liquid crystal layer arranged between the upper substrate and the lower substrate, wherein the upper substrate comprises a substrate, a common electrode layer and a light alignment layer which are sequentially stacked, and the upper surface or the lower surface of the common electrode layer is also provided with a layer of antireflection layer. The method comprises the steps of obtaining the average reflectivity of a public electrode layer in a set waveband; adjusting the thickness and refractive index of the antireflection layer; acquiring the change condition of the average reflectivity caused by the change of the thickness and the refractive index of the antireflection layer; the thickness and the refractive index of the antireflection layer corresponding to the minimum value of the average reflectance are set as the thickness and the refractive index of the antireflection layer of the liquid crystal display panel.
The technical scheme adopted by the invention is to provide the liquid crystal display panel, which comprises an upper substrate, a lower substrate and a liquid crystal layer arranged between the upper substrate and the lower substrate; the upper substrate comprises a substrate base plate, a common electrode layer and a light alignment layer which are sequentially stacked, the upper surface or the lower surface of the common electrode layer is also provided with a reflection reducing layer, and the reflection reducing layer is used for reducing the reflectivity of the upper surface or the lower surface of the common electrode layer; wherein the thickness and refractive index of the antireflection layer are determined by the above method.
The present invention provides a liquid crystal display, wherein the display panel comprises a backlight and the display panel.
Through the scheme, the invention has the beneficial effects that: obtaining the average reflectivity of the common electrode layer in a set waveband; adjusting the thickness and refractive index of the antireflection layer; acquiring the change condition of the average reflectivity caused by the change of the thickness and the refractive index of the antireflection layer; the thickness and the refractive index of the antireflection layer corresponding to the minimum value of the average reflectance are set as the thickness and the refractive index of the antireflection layer of the liquid crystal display panel. The thickness and the refractive index of the antireflection layer which enables the reflectivity of the common electrode layer to be minimum are determined by adjusting the thickness and the refractive index of the antireflection layer, so that the reflectivity of the common electrode layer is reduced, and the contrast is enhanced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
FIG. 1 is a schematic structural diagram of an embodiment of a liquid crystal display panel according to the present invention;
FIG. 2 is a schematic flow chart illustrating a method for determining a reflection reducing layer of an LCD panel according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a method for determining a reflection reducing layer of a liquid crystal display panel according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a human eye viewing function in another embodiment of the method for determining a reflection reducing layer of a liquid crystal display panel according to the present invention;
FIG. 5 is a reflection spectrum of an LCD panel without an added anti-reflection layer and a reflection spectrum of an LCD panel with an added optimal anti-reflection layer according to another embodiment of the present invention;
FIG. 6 is a schematic flow chart illustrating a method for determining a reflection reducing layer of a liquid crystal display panel according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of an embodiment of a liquid crystal display according to the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
Fig. 1 is a schematic structural diagram of an embodiment of a liquid crystal display panel according to the present invention.
The liquid crystal display panel comprises an upper substrate 11, a lower substrate 12 and a liquid crystal layer 13 arranged between the upper substrate and the lower substrate, wherein the upper substrate 11 comprises a substrate 111, a common electrode layer 112 and a photoalignment layer 113 which are sequentially stacked, and an antireflection layer 114 is further arranged on the upper surface or the lower surface of the common electrode layer 112.
The substrate 111 may be a transparent glass substrate or a plastic substrate, and the common electrode layer 112 may be made of ITO (indium tin oxide).
The antireflection layer 114 is used to reduce the reflectivity of the common electrode layer 112, and optionally, the material of the antireflection layer 114 generally adopts silicon dioxide, silicon nitride, magnesium fluoride, samarium oxide, aluminum oxide, zinc sulfide, titanium dioxide, zirconium oxide, and the like.
It will be appreciated that the thickness and refractive index of the antireflection layer 114 directly affect its performance, resulting in a different degree of influence on the reflectivity of the common electrode layer 112, and how to determine its thickness and refractive index will be described in several embodiments below.
Referring to fig. 2, fig. 2 is a schematic flowchart illustrating a method for determining a reflection reducing layer of a liquid crystal display panel according to an embodiment of the present invention. The method for determining the anti-reflection layer of the liquid crystal display panel comprises the following steps:
step 21: and acquiring the average reflectivity of the common electrode layer in a set waveband.
The average reflectivity of the common electrode layer in the set wavelength band may be obtained experimentally, for example, by irradiating the common electrode layer with a light beam in the set wavelength band, and measuring the reflectivity of the common electrode layer by a dedicated measuring instrument. Specifically, the reflectivity of the optical fiber can be measured for a plurality of wavelength values within a set wavelength band, and then the average reflectivity can be obtained by averaging.
In addition, the reflectance of the common electrode layer in a set wavelength band may be obtained by simulation using a rigorous coupled wave analysis method, and the average reflectance may be obtained by averaging or performing weighted average on the reflectance in the wavelength band.
For example: setting the wave band to be 400nm-500nm, and the sampling interval to be 50nm, wherein the measured reflectivities in the wave band are respectively as follows: 3.6%, 3.2% and 4.3%, the weighting coefficients are: 0.3, 0.4, and 0.3, the average reflectance is: 3.6% × 0.3+ 3.2% × 0.4+ 4.3% × 0.3 — 3.65%.
Step 22: the thickness and refractive index of the anti-reflection layer are adjusted.
Setting the thickness of the antireflection layer as a set thickness value, and adjusting the refractive index of the antireflection layer; or setting the refractive index of the antireflection layer as a set refractive index value, and adjusting the thickness of the antireflection layer; or both the thickness and refractive index of the antireflective layer may be adjusted.
Step 23: the variation of the average reflectivity with the variation of the thickness and the refractive index of the antireflection layer is obtained.
The corresponding average reflectivity is obtained using optical simulation software or manual measurements at different antireflection layer thicknesses and refractive indices.
Step 24: the thickness and the refractive index of the antireflection layer corresponding to the minimum value of the average reflectance are set as the thickness and the refractive index of the antireflection layer of the liquid crystal display panel.
Specifically, if the thickness range of the antireflection layer is 100-200nm and the refractive index range is 1.8-1.9, the thickness of the antireflection layer is set to 100nm, then the refractive index is adjusted to 1.9 from 1.8 according to the set compensation, and the antireflection layer thickness and the refractive index corresponding to the minimum value of the reflectivity of the common electrode layer are determined; and then increasing the antireflection layer according to the set compensation, for example, adjusting the antireflection layer to 120nm, then sequentially adjusting the refractive index from 1.8 to 1.9 according to the set compensation, determining the antireflection layer thickness and the refractive index corresponding to the minimum value of the reflectivity of the common electrode layer, and so on, without examples.
And for different thicknesses and refractive indexes of the antireflection layer, obtaining different average reflectivities, and taking the thickness and the refractive index of the antireflection layer corresponding to the minimum value in the obtained average reflectivities as the thickness and the refractive index of the antireflection layer of the liquid crystal display panel.
It will be appreciated that the thickness and refractive index of the anti-reflection layer having the lowest average reflectivity will be different for common electrode layers of different thickness and refractive index.
For example, assuming that the thickness of the common electrode layer is 200nm, the refractive index is 2.3, and the thickness and the refractive index of the antireflection layer having the smallest average reflectance are 85nm and 2.4, respectively; if the thickness of the common electrode layer is 180nm and the refractive index is 2.3, the thickness and the refractive index of the antireflection layer having the smallest average reflectance are 90nm and 2.1, respectively.
Different from the prior art, in the method for determining the antireflection layer of the liquid crystal display panel provided by this embodiment, first, the average reflectivity of the common electrode layer in a set waveband is obtained; secondly, adjusting the thickness and the refractive index of the antireflection layer; then obtaining the change condition of the average reflectivity caused by the change of the thickness and the refractive index of the antireflection layer; and finally, taking the thickness and the refractive index of the antireflection layer corresponding to the minimum value of the average reflectivity as the thickness and the refractive index of the antireflection layer of the liquid crystal display panel. The thickness and the refractive index of the antireflection layer which enables the reflectivity of the common electrode layer to be minimum are determined by adjusting the thickness and the refractive index of the antireflection layer, so that the reflectivity of the common electrode layer is reduced, and the contrast is enhanced; compared with a multilayer film structure, the single-layer film antireflection layer has the advantages of simple structure and short processing time, and is easy to realize.
Referring to fig. 3, fig. 3 is a schematic flow chart of another embodiment of a method for determining a reflection reducing layer of a liquid crystal display panel, the method including:
step 31: and acquiring the reflectivity of the common electrode layer in a set waveband to obtain a reflection spectrum R (lambda).
The average reflectance R is obtained by the following formulaave：
Wherein the average reflectivity RaveThe weighting factor V (λ) of (a) is the eye's visual function, λ is the wavelength.
Under the condition of causing the same visual response, if the optical radiation power required by light with the wavelength λ is P (λ) and the optical radiation power required by light with the wavelength 555nm (to which the human eye is most sensitive) is P (555), V (λ) ═ P (555)/P (λ) is defined as the human eye visual function with the wavelength λ.
The human eye's visual function is shown in fig. 4, where V is the human eye's visual function value. The human eye produces the same visual effect for monochromatic light with different wavelengths and has different radiation power. In the visible spectrum, the human eye is most sensitive to the middle (yellow-green) of the spectrum, and is less sensitive the closer to the two ends of the spectrum.
In practical applications, discrete values may be used instead of continuous values to find the average reflectivity. The average reflectance R is obtained by the following formulaave：
Wherein M is the minimum value of the selected wavelength, N is the maximum value of the selected wavelength, t is the sampling interval, and t is more than or equal to 0 and less than or equal to N-M.
For example, the wavelength is 400-700nm, the sampling interval is 20nm, there are 17 sampling points, the reflectance of the wavelength and the value of the human eye visual function corresponding to these 17 points are obtained, and the average reflectance can be obtained by using the above formula.
The antireflection layer may be a porous structure formed by depositing a high refractive index material on the upper surface or the lower surface of the common electrode layer or formed by co-sputtering a high refractive index target and a low refractive index target on the upper surface or the lower surface of the common electrode layer.
The high refractive index and the low refractive index are relative to each other in the high refractive index target and the low refractive index target, and there is no specific range limitation. For example, titanium dioxide and samarium oxide are used as targets, the refractive index of titanium dioxide is 2.3, the refractive index of samarium oxide is 1.8, and samarium oxide is a low-refractive-index target compared with titanium dioxide; if samarium oxide and silicon dioxide are used as the target material, the refractive index of the silicon dioxide is 1.45, and the samarium oxide is a high-refractive index target material compared with the silicon dioxide.
Step 32: setting the thickness of the antireflection layer as a set thickness value, and adjusting the refractive index of the antireflection layer; or the refractive index of the antireflection layer is set to be a set refractive index value, and the thickness of the antireflection layer is adjusted.
Wherein, the thickness of the antireflection layer is generally less than 200nm, and the maximum value of the thickness of the antireflection layer can be adjusted according to actual needs.
For example, assuming that the thickness of the antireflection layer is 100nm, the refractive index of the antireflection layer is adjusted within a range of 1.7 to 1.9 to obtain an average refractive index at different refractive indexes of the thickness; or keeping the refractive index of the antireflection layer to be 1.7, and adjusting the thickness of the antireflection layer from 80nm to 150nm to obtain the average refractive index of the antireflection layer under different thicknesses.
Setting the refractive index value of the antireflection layer between the refractive index of the common electrode layer and the refractive index of the substrate; or to set the refractive index value between the refractive index of the common electrode layer and the refractive index of the photo-alignment layer.
For example, if the refractive index of the common electrode layer is 2.4 and the refractive index of the base substrate is 2.1, the refractive index of the antireflection layer is in the range of [2.1,2.4], and the refractive index of the antireflection layer can be limited to this range when obtaining an average reflectance.
Step 33: and acquiring the variation of the average reflectivity caused by the variation of the thickness and the refractive index of the antireflection layer.
Step 34: the thickness and the refractive index of the antireflection layer corresponding to the minimum value of the average reflectance are set as the thickness and the refractive index of the antireflection layer of the liquid crystal display panel.
In a specific embodiment, the reflection spectrum R (λ) of the common electrode layer in the visible wavelength range is simulated by using a rigorous coupled wave analysis method as shown by a solid line in fig. 5. The average reflectivity R is calculated by using the human eye visual function V (lambda) shown in FIG. 4 as a weighting factorave＝39.8％。
Adding an antireflection layer on the upper surface of the common electrode layer, and simulating to obtain the average reflectivity RaveThe distribution law of the antireflection layer along with the change of the refractive index and the thickness. When the refractive index of the antireflection layer is nAR1.86, thickness hARAt 84nm, the average reflectance takes the minimum value Rave＝10-2.628＝0.24％。
When the refractive index of the antireflection layer is nAR1.86, thickness hARAt 84nm, the reflectance spectrum is shown in dashed lines in fig. 5. By comparing the solid line and the dotted line, it can be seen that the optimally designed subtraction layer achieves very good subtraction effect, especially between the wavelength of 500-.
Different from the prior art, in the method for determining the antireflection layer of the liquid crystal display panel provided in this embodiment, the reflectivity of the common electrode layer at the set waveband is obtained, and the weighted average is performed on the reflectivity by using a human-eye visual function, so that the thickness and the refractive index of the antireflection layer which enables the reflectivity of the common electrode layer to be the minimum are obtained.
Referring to fig. 6, fig. 6 is a schematic flowchart illustrating a method for determining a reflection reducing layer of a liquid crystal display panel according to another embodiment of the present invention. The method for determining the anti-reflection layer of the liquid crystal display panel comprises the following steps:
step 61: and acquiring the average reflectivity of the common electrode layer in a set waveband.
Step 62: the thickness and refractive index of the anti-reflection layer are adjusted.
And step 63: the variation of the average reflectivity with the variation of the thickness and the refractive index of the antireflection layer is obtained.
Step 64: and establishing a three-dimensional coordinate system by taking the thickness of the antireflection layer as an x coordinate, the refractive index of the antireflection layer as a y coordinate and the average reflectivity as a z coordinate so as to determine the average reflectivity corresponding to different antireflection layer thicknesses and different antireflection layer refractive indexes.
And obtaining the average reflectivity under the thicknesses and the refractive indexes of different antireflection layers by using optical simulation software or manual measurement, establishing the relation between the thicknesses and the refractive indexes, and determining the antireflection layer thickness and the antireflection layer refractive index corresponding to the minimum reflectivity.
When the distribution rule of the thickness of the antireflection layer, the refractive index of the antireflection layer and the average reflectivity is obtained by using optical simulation software, the average reflectivity can be expressed by three primary colors (red, blue and green), wherein the higher the average reflectivity is, the larger the red component is, and the lower the average reflectivity is, the larger the blue component is.
Different from the prior art, the method for determining the antireflection layer of the liquid crystal display panel provided by the embodiment establishes a coordinate system of the thickness of the antireflection layer and the average reflectivity under the refractive index, visually expresses the relation between the thickness of the antireflection layer and the average reflectivity under the refractive index, and is convenient to observe, so that the thickness of the antireflection layer and the refractive index of the antireflection layer corresponding to the minimum value of the reflectivity can be easily determined.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an embodiment of a liquid crystal display according to the invention. The display panel 70 includes a backlight 71 and the display panel 72 described above.
In the embodiments provided in the present invention, it should be understood that the disclosed method and apparatus can be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. The utility model provides a method for confirming anti-reflection layer of LCD panel, LCD panel includes upper substrate, infrabasal plate and sets up in upper substrate with the liquid crystal layer between the infrabasal plate, the upper substrate includes substrate base plate, public electrode layer and the photoalignment layer that stacks gradually the setting, the upper surface of public electrode layer still is provided with one deck anti-reflection layer, its characterized in that, the method includes:
simulating by using a strict coupled wave analysis method to obtain the reflectivity of the common electrode layer in a set waveband, and averaging or weighted averaging the reflectivity in the set waveband to obtain the average reflectivity of the common electrode layer in the set waveband;
adjusting the thickness and refractive index of the anti-reflection layer simultaneously;
acquiring the change condition of the average reflectivity caused by the change of the thickness and the refractive index of the antireflection layer;
taking the thickness and the refractive index of the antireflection layer corresponding to the minimum value of the average reflectivity as the thickness and the refractive index of the antireflection layer of the liquid crystal display panel;
wherein the antireflection layer is used for reducing the reflectivity of the upper surface of the common electrode layer; the antireflection layer is formed by jointly sputtering a high-refractive-index target and a low-refractive-index target on the upper surface of the common electrode layer.
2. The method of claim 1,
the step of acquiring the variation of the average reflectivity caused by the variation of the thickness and the refractive index of the antireflection layer comprises the following steps:
and establishing a three-dimensional coordinate system by taking the thickness of the antireflection layer as an x coordinate, the refractive index of the antireflection layer as a y coordinate and the average reflectivity as a z coordinate so as to determine the average reflectivity corresponding to different antireflection layer thicknesses and different antireflection layer refractive indexes.
3. The liquid crystal display panel is characterized by comprising an upper substrate, a lower substrate and a liquid crystal layer arranged between the upper substrate and the lower substrate;
the upper substrate comprises a substrate base plate, a common electrode layer and a light alignment layer which are sequentially stacked, the upper surface of the common electrode layer is also provided with a reflection reducing layer, and the reflection reducing layer is used for reducing the reflectivity of the upper surface of the common electrode layer;
wherein the thickness and refractive index of the anti-reflection layer are determined using the method of any one of claims 1-2.
4. A liquid crystal display, wherein the display panel comprises a backlight and the display panel of claim 3.
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| CN1945376A (en) * | 2006-10-25 | 2007-04-11 | 浙江大学 | Film layer design method for clearing double layer film structure coated film glass reflection color |
| CN101299106A (en) * | 2006-12-21 | 2008-11-05 | 三星电子株式会社 | Color filter substrate and liquid crystal display panel containing the same |
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