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CN113917730A - Display device - Google Patents

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Publication number
CN113917730A
CN113917730A CN202111164466.1A CN202111164466A CN113917730A CN 113917730 A CN113917730 A CN 113917730A CN 202111164466 A CN202111164466 A CN 202111164466A CN 113917730 A CN113917730 A CN 113917730A
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China
Prior art keywords
layer
liquid crystal
display device
polarizing
moire
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Withdrawn
Application number
CN202111164466.1A
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Chinese (zh)
Inventor
林宜臻
郑婷文
吴建宏
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BenQ Materials Corp
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BenQ Materials Corp
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Priority to CN202111164466.1A priority Critical patent/CN113917730A/en
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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
    • G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
    • G02F1/133562—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the viewer side
    • 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
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • 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
    • 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
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells

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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 display device, which comprises a backlight module, a main control type dimming layer, a liquid crystal display panel and a moire cancellation layer, wherein the main control type dimming layer is arranged on a light-emitting surface of the backlight module and comprises a plurality of dimming subregions capable of changing light polarization directions; the liquid crystal display panel is arranged on the light-emitting surface of the main control type dimming layer and comprises a first polarizing layer, a second polarizing layer and a liquid crystal box between the first polarizing layer and the second polarizing layer, and the second polarizing layer is arranged between the liquid crystal box and the main control type dimming layer; the moire offsetting layer is arranged on the display side of the first polarizing layer; wherein the haze of the moire counteracting layer is between 65 and 85 percent. The invention has the Moire pattern improving effect and better contrast gain multiplying power, thereby improving the display image quality and the watching experience of a user.

Description

Display device
Technical Field
The present invention relates to a display device, and more particularly, to a display device capable of increasing display contrast and avoiding optical interference such as moire.
Background
As the image quality of the Display is more required, various displays with different light emitting mechanisms, such as a Liquid Crystal Display (LCD), an Organic Light Emitting Diode (OLED) Display, a Micro-LED Display (Micro-LED Display), and the like, are already on the market. The liquid crystal display is not a self-luminous type display, so the liquid crystal display is inferior to a self-luminous type organic light emitting diode display and a micron-sized light emitting diode display in contrast and dark state pure black picture performance. However, as the demand for increasing the display area of the display device by users is still increasing, the current lcd still has advantages in terms of the process maturity and cost of the lcd device in large-scale display applications relative to other displays of the same size.
Therefore, it is only necessary to reduce the light leakage of dark black image and use local dimming technique to achieve the high contrast effect of the liquid crystal display as that of the self-luminous type electroluminescent diode display. In the prior art, the area dimming effect can be achieved by the point light source arrangement design and the driving technique of the backlight module, but because the number of the point light sources in the backlight module is much less than the number of pixels of the display, the backlight adjustment of a large block can be obtained, and it is difficult to obtain the independent dimming effect of the pixel level as the self-luminous display. Therefore, a method for disposing the main control type dimming layer on the backlight module is proposed, in which the main control type dimming layer can control the local penetration degree of the backlight source to the pixel level area. The micro-electromechanical light valve can be used for light regulation in the past, and the effect of respectively dimming a plurality of micro areas can be achieved by adopting the technology of driving the liquid crystal light valve by a Thin-Film Transistor (TFT) which is mature in the field of liquid crystal display.
Please refer to fig. 1A, which is an exploded schematic view of a conventional display device 100 in which a main control type dimming layer 2 and a liquid crystal display panel 1 are simply stacked. The liquid crystal display panel 1 has a liquid crystal cell 13 disposed between the first polarizing layer 11 and the second polarizing layer 12. The main control type dimming layer 2 may include a dimming liquid crystal cell 23 and a third polarizing layer 21, wherein the third polarizing layer 21 is disposed between the dimming liquid crystal cell 23 and the backlight module 3 to change the polarization direction of the backlight source. The main control type light modulation layer 2 only has the function of regulating whether the light of each pixel passes through the liquid crystal display panel 1 or not, and does not need to have the display effect, so elements such as a color filter and the like can be omitted to avoid reducing the excessive transmittance. In addition, since the pixels of the liquid crystal cell 13 and the light-adjusting liquid crystal cell 23 of the display device 100 are all periodically arranged, and the size, number and repetition period of the pixels are usually set to be similar to obtain a better individual light-adjusting effect of each pixel, the arrangement and shape of the pixels need to be specially designed, or as shown in the exploded schematic diagram of the display device 100' of fig. 1B, the moire cancellation layer 4 is disposed on the light-emitting side of the main control light-adjusting layer 2 or one side of the liquid crystal cell 13 to destroy the periodicity and directivity of the light emitted from the main control light-adjusting layer 2, so as to avoid the defects of moire generated by the interference between the main control light-adjusting layer 2 and the liquid crystal display panel 1. However, in order to achieve the above effect, the unpolarized light L emitted from the backlight module 3 passes through the main control type light modulation layer 2 to form a light L1 with a single polarization direction, and then passes through the moire cancellation layer 4 of the display device 100' shown in fig. 1B, and the polarization and the directivity are destroyed to generate a partially depolarized polarized light L2, so that after entering the first polarization layer 11 and the second polarization layer 12 of the liquid crystal display panel 1 again, the light efficiency of the emitted polarized light L3 will be lost again, thereby affecting the efficiency of increasing the display contrast by the main control type light modulation layer 2.
Therefore, a display device is needed, which can improve the contrast of the liquid crystal display panel by the main control type dimming layer, and can avoid moire fringes formed between the main control type dimming layer and the liquid crystal display panel and reduce the backlight light efficiency.
Disclosure of Invention
In view of the above problems of the prior art, it is an object of the present invention to provide a display device having patent requirements such as novelty, advancement and industrial applicability, so as to overcome the difficulties of the conventional products.
To achieve the above object, the present invention provides a display device, comprising: the backlight module comprises a backlight module, a master control type dimming layer, a liquid crystal display panel and a moire cancellation layer; the main control type dimming layer is arranged on the light-emitting surface of the backlight module and comprises a plurality of dimming subregions capable of changing the light polarization direction; the liquid crystal display panel is arranged on the light-emitting surface of the main control type dimming layer and comprises a first polarizing layer, a second polarizing layer and a liquid crystal box between the first polarizing layer and the second polarizing layer, and the second polarizing layer is arranged between the liquid crystal box and the main control type dimming layer; the moire offsetting layer is arranged on the display side of the first polarizing layer; wherein the haze of the moire counteracting layer is between 65% and 85%.
In the display device of an embodiment, the first polarizing layer of the liquid crystal display panel has a first absorption axis, and the second polarizing layer has a second absorption axis, and the first absorption axis and the second absorption axis are parallel or perpendicular to each other.
In another embodiment of the display device, the master-controlled dimming layer includes a dimming liquid crystal cell and a third polarizing layer interposed between the dimming liquid crystal cell and the backlight module, wherein the third polarizing layer has a third absorption axis, and the third absorption axis is perpendicular to or parallel to the second absorption axis of the second polarizing layer.
In another embodiment of the display device, the moire cancellation layer comprises a plurality of scattering particles and a polymer matrix, and the scattering particles are dispersed in the polymer matrix.
In another embodiment of the display device, the scattering particles are inorganic metal oxide particles and/or organic resin particles.
In another embodiment of the display device, the moire cancellation layer has a thickness between 10 μm and 30 μm.
In another embodiment of the display device, the first, second and third polarizing layers are dyed polarizing layers, coated polarizing layers, grating polarizing layers or a combination thereof.
In another embodiment of the display device, the display device further includes at least one functional film layer on the surface of the moire cancellation layer, wherein the functional film layer is a hard coating film, an anti-fouling film, an anti-reflection film, an anti-glare film or a combination thereof.
In another embodiment of the display device, the moire cancellation layer is a scattering adhesive layer.
In another embodiment of the display device, each of the light modulation subregions on the main control type light modulation layer corresponds to each of the pixels in the liquid crystal display panel one by one.
According to the display device, the main control type dimming layer is arranged on the light emitting surface of the backlight module, the moire counteracting layer is arranged on the display side of the first polarizing layer of the liquid crystal display panel, and the haze of the moire counteracting layer is between 65% and 85%, so that the moire improving effect is achieved, the contrast gain magnification is good, and the display image quality and the watching experience of a user are improved.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1A is an exploded view of a conventional display device 100 having a master dimming layer.
FIG. 1B is an exploded view of another conventional display device 100' having a master dimming layer and a moire cancellation layer.
Fig. 2A is an exploded view of a display device 200 according to an embodiment of the invention.
Fig. 2B is a schematic optical path diagram of an exploded view of the display device 200 according to an embodiment of the present invention.
Fig. 3 is an exploded view of a display device 300 according to another embodiment of the present invention.
Detailed Description
In order to make the features, contents and advantages of the present invention and the effects achieved thereby easier to understand, the present invention will be described in detail with the accompanying drawings and the expression forms of the embodiments, and the drawings used therein are only for illustrative and auxiliary purposes, not necessarily the actual proportion and the precise configuration after the implementation of the present invention, and therefore, the proportion and the configuration relationship of the drawings attached should not be interpreted to limit the scope of the right of the present invention in the actual implementation.
Embodiments of a display device according to the present invention will be described below with reference to the accompanying drawings, and for convenience of understanding, like elements in the embodiments described below are denoted by like reference numerals.
Please refer to fig. 2A, which is an exploded view of a display device 200 according to an embodiment of the present invention, comprising: the backlight module 5, the master control type dimming layer 6, the liquid crystal display panel 7 and the moire cancellation layer 4. The main control type light adjusting layer 6 is arranged on the light emitting surface of the backlight module 5, and the main control type light adjusting layer 6 comprises a plurality of light adjusting subregions 62 capable of changing the light polarization direction; the liquid crystal display panel 7 is disposed on the light exit surface of the main control type dimming layer 6, the liquid crystal display panel 7 includes a first polarizing layer 71, a second polarizing layer 72, and a liquid crystal cell 73 interposed between the first polarizing layer 71 and the second polarizing layer 72, and the second polarizing layer 72 is interposed between the liquid crystal cell 73 and the main control type dimming layer 6; the moire cancellation layer 4 is disposed on the display side of the first polarizing layer 71; wherein the haze of the moire counteracting layer 4 is 65 to 85 percent.
In the display device of an embodiment, since the general liquid crystal display panel can select the alignment direction of the liquid crystal when not energized according to the kind or application of the liquid crystal, so as to change the optical rotation direction after the light enters and control the liquid crystal display panel to be in the normally dark mode or the normally bright mode, the first absorption axis 71a of the first polarizing layer 71 and the second absorption axis 72a of the second polarizing layer 72 of the liquid crystal display panel 7 can be parallel or perpendicular to each other.
In another embodiment of the display device, the main control dimming layer 6 includes a dimming liquid crystal cell 63 and a third polarizing layer 61, and the third polarizing layer 61 is interposed between the dimming liquid crystal cell 63 and the backlight module 5. The third polarizing layer 61 has a third absorption axis 61a, and by adjusting the direction of the optical rotation between the light-adjusting liquid crystal cell 63 and the non-energized optical rotation, the third absorption axis 61a and the second absorption axis 72a of the second polarizing layer 72 can also be perpendicular or parallel to each other, so that whether the polarized light passing through each light-adjusting sub-region 62 can enter the liquid crystal display panel 7 can be controlled by the power supply. In one embodiment, each of the light-adjusting subregions 62 on the main control light-adjusting layer 6 corresponds to each of the pixels in the liquid crystal display panel 7 one by one, so that the light entering each of the pixels in the liquid crystal display panel 7 is adjusted by each of the light-adjusting subregions 62.
Please refer to fig. 2B, which is a schematic optical path diagram of an explosion diagram of the display device 200 according to an embodiment of the present invention. The unpolarized light L emitted by the backlight module 5 passes through the main control type dimming layer 6 to form a light L1 with a polarization direction orthogonal to the absorption axis 72a, and then the light L1 can directly enter the liquid crystal display panel 7, because the light does not pass through the moire cancellation layer 4 in the proceeding process, the polarized light L2 emitted by the liquid crystal display panel 7 can still maintain good directivity and intensity, and finally the light L2 enters the moire cancellation layer 4 outside the first polarizing layer 71, even if partial depolarization is generated in the light L3 emitted by the moire cancellation layer 4, the polarization direction is changed, but the light L3 does not pass through other polarizing layers, no loss is generated, the light efficiency is good, and the influence on the efficiency of increasing the display contrast of the main control type dimming layer 6 is small.
In another embodiment of the display device, the moire cancellation layer 4 may be formed by, for example, dispersing a plurality of scattering particles (not shown) in a polymer matrix (not shown) to refract the image light to change the periodicity and regularity. In practice, the scattering particles (not shown) are inorganic metal oxide particles and/or organic resin particles, so as to have a refractive index difference with the polymer matrix (not shown).
In another embodiment of the display device, in order to make the image light have sufficient optical path to generate deflection in the moire cancellation layer 4, the thickness of the moire cancellation layer 4 should preferably be larger than 10 μm and smaller than 30 μm to avoid the image light being excessively deflected and blurred to affect the resolution.
In another embodiment of the display device, the first, second and third polarizing layers 71, 72 and 61 are dyed type polarizing layers, coated type polarizing layers, grating type polarizing layers or a combination thereof.
Referring to fig. 3, an exploded view of the display device 300, in another embodiment of the display device, the display device 300 further includes at least one functional film layer 8, the functional film layer 8 is disposed on the surface of the moire cancellation layer 4, and the functional film layer 8 is a hard coating film, an anti-smudge film, an anti-reflection film, an anti-glare film, or a combination thereof.
In another embodiment of the display device, the moire cancellation layer 4 is a scattering adhesive layer, so that when a functional film layer is required to be externally attached, it can be attached by the scattering adhesive layer having a moire cancellation effect.
The following examples are intended to further illustrate the invention, but the invention is not limited thereto.
Examples
Example 1
In the display device disclosed in this embodiment 1, the first system uses a liquid crystal display panel (model 22MP58, LG) as a main display panel, and matches a light modulation liquid crystal cell with a third polarization layer as a main control type light modulation layer, and a moire cancellation layer. In the structural configuration, the backlight module, the third polarizing layer, the dimming liquid crystal box, the second polarizing layer, the liquid crystal display panel, the first polarizing layer, the moire cancellation layer and the anti-glare surface treatment layer are sequentially superposed from the backlight side. The moire-canceling layer was an acrylic pressure-sensitive adhesive layer (model 443K25H65, fujimmori) having a thickness of 25 μm and a haze of 65%. The first absorption axis of the first polarizing layer of the liquid crystal display panel is parallel to the horizontal display direction of the liquid crystal display panel, the second absorption axis of the second polarizing layer is parallel to the vertical display direction of the liquid crystal display panel, and the third absorption axis of the third polarizing layer of the main control type dimming layer is parallel to the horizontal display direction of the liquid crystal display panel.
Example 2
In the display device disclosed in example 2, the same configuration as in example 1 was adopted, and instead of the moire-canceling layer, an acrylic pressure-sensitive adhesive layer (model 443K25H85, fujiori) having a thickness of 25 μm and a haze of 85% was used.
Comparative example
Comparative example 1
In this comparative example 1, a conventional single liquid crystal display panel (model 22MP58, LG) was used as the display panel without a main-control dimming layer. The backlight module, the second polarizing layer, the liquid crystal display panel, the first polarizing layer and the anti-glare surface treatment layer are sequentially superposed on the backlight side in the structural configuration. A first absorption axis of the first polarizing layer of the liquid crystal display panel is parallel to a horizontal display direction of the liquid crystal display panel, and a second absorption axis of the second polarizing layer is parallel to a vertical display direction of the liquid crystal display panel.
Comparative example 2
In the display device disclosed in comparative example 2, a liquid crystal display panel (model 22MP58, LG) was used as the main display panel, and a light modulation liquid crystal cell having a third polarization layer was used as the main control type light modulation layer, but the moire cancellation layer was not provided. The backlight module, the third polarizing layer, the dimming liquid crystal box, the second polarizing layer, the liquid crystal display panel, the first polarizing layer and the anti-glare surface treatment layer are sequentially superposed from the backlight side in the structural configuration. Similarly, a first absorption axis of the first polarizing layer of the liquid crystal display panel is parallel to a horizontal display direction of the liquid crystal display panel, a second absorption axis of the second polarizing layer is parallel to a vertical display direction of the liquid crystal display panel, and a third absorption axis of the third polarizing layer of the main control type dimming layer is parallel to the horizontal display direction of the liquid crystal display panel.
Comparative example 3
In the display device disclosed in comparative example 3, a liquid crystal display panel (model 22MP58, LG) is used as a main display panel, and a light modulation liquid crystal cell having a third polarization layer is used as a main control type light modulation layer and a moire cancellation layer. The structure configuration is different from that of the first embodiment, and the backlight module, the third polarizing layer, the dimming liquid crystal box, the second polarizing layer, the liquid crystal display panel, the moire cancellation layer, the first polarizing layer and the anti-glare surface treatment layer are sequentially superposed from the backlight side. The moire-canceling layer was an acrylic pressure-sensitive adhesive layer (model 443K25H65, fujimmori) having a thickness of 25 μm and a haze of 65%. The first absorption axis of the first polarizing layer of the liquid crystal display panel is parallel to the horizontal display direction of the liquid crystal display panel, the second absorption axis of the second polarizing layer is parallel to the vertical display direction of the liquid crystal display panel, and the third absorption axis of the third polarizing layer of the main control type dimming layer is parallel to the horizontal display direction of the liquid crystal display panel.
Comparative example 4
In the display device disclosed in comparative example 4, the same configuration as in comparative example 3 was adopted, and instead of the moire cancellation layer, an acrylic pressure-sensitive adhesive layer (model 443K25H85, fujimmori) having a thickness of 25 μm and a haze of 85% was used.
Please refer to table one, in which a panel measuring instrument (model DMS 903, Autronic-Melchers) is used to measure the contrast values of the bright and dark states of the above examples and comparative examples, and compare the measured contrast values with the conventional single display panel value of comparative example 1 to obtain the contrast gain ratio. The degree of moire was evaluated by human eyes as to whether or not moire occurred in the bright screen of the display devices and the degree thereof, and when significant moire was observed, the value was evaluated as (X), and when slight moire was observed, the value was evaluated as (o), and when no moire was observed, the value was evaluated as (X).
Table one: display device measurement results
Figure BDA0003291221980000081
From the measurement results in table one, it is obvious that, although the contrast ratio of comparative example 2 having the master dimming layer is greatly improved compared to comparative example 1 having only a single display panel, the contrast gain ratio is the highest compared to comparative example 1, however, the contrast gain ratio has obvious moire which seriously affects the display image quality and the user's viewing experience. Examples 1, 2, 3 and 4, which have moir e cancellation layers in their structural configurations, all improve to varying degrees, making them more or less visible as haze increases. However, the moire cancellation layer may destroy the coherence and polarization direction of light, and reduce the contrast gain effect, especially as in the embodiments 1 and 3, 2 and 4, when the moire cancellation layer has the same haze, the moire cancellation layer is disposed between the first and second polarizing layers at both sides of the liquid crystal display panel, which may further reduce the contrast due to more loss of the transmission efficiency of polarized light. Therefore, in the embodiments 1 and 2 of the present invention, the moire cancellation layer is disposed outside the first polarizing layer of the liquid crystal display panel, which can have the moire improvement effect equivalent to that of the moire cancellation layer disposed between the first polarizing layer and the second polarizing layer, and has a better contrast gain ratio.
The above-mentioned embodiments are merely illustrative of the technical spirit and features of the present invention, and the object of the present invention is to enable those skilled in the art to understand the content of the present invention and to implement the same, and the scope of the present invention should not be limited by the above-mentioned embodiments, i.e. all equivalent changes and modifications made in the spirit of the present invention should be covered in the scope of the present invention.

Claims (10)

1. A display device, comprising:
a backlight module;
the main control type dimming layer is arranged on the light-emitting surface of the backlight module and comprises a plurality of dimming subregions capable of changing the light polarization direction;
the liquid crystal display panel is arranged on the light-emitting surface of the main control type dimming layer and comprises a first polarizing layer, a second polarizing layer and a liquid crystal box between the first polarizing layer and the second polarizing layer, and the second polarizing layer is arranged between the liquid crystal box and the main control type dimming layer; and
a moire cancellation layer disposed on a display side of the first polarizing layer;
wherein the haze of the moire counteracting layer is between 65% and 85%.
2. The display device according to claim 1, wherein the first polarizing layer of the liquid crystal display panel has a first absorption axis, and the second polarizing layer has a second absorption axis, and the first absorption axis and the second absorption axis are parallel or perpendicular to each other.
3. The display device according to claim 1, wherein the master-controlled dimming layer comprises a dimming liquid crystal cell and a third polarizing layer interposed between the dimming liquid crystal cell and the backlight module, wherein the third polarizing layer has a third absorption axis, and the third absorption axis is perpendicular to or parallel to the second absorption axis of the second polarizing layer.
4. The display device as claimed in claim 3, wherein the first, second and third polarizing layers are dyed polarizing layers, coated polarizing layers, grating polarizing layers or a combination thereof.
5. The display device of claim 1, wherein the moire cancellation layer comprises a plurality of scattering particles and a polymer matrix, the plurality of scattering particles being dispersed in the polymer matrix.
6. The display device according to claim 5, wherein the plurality of scattering particles are inorganic metal oxide particles and/or organic resin particles.
7. The display device of claim 1, wherein the moire cancellation layer has a thickness of 10 μm to 30 μm.
8. The display device of claim 1, further comprising at least one functional film layer disposed on the surface of the moire cancellation layer, wherein the at least one functional film layer is a hard coating film, an anti-smudge film, an anti-reflection film, an anti-glare film, or a combination thereof.
9. The display device of claim 1, wherein the moire counteracting layer is a scattering adhesive layer.
10. The display device according to claim 1, wherein each of the light modulation subregions of the main control light modulation layer corresponds to a respective pixel of the liquid crystal display panel.
CN202111164466.1A 2021-09-30 2021-09-30 Display device Withdrawn CN113917730A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101263417A (en) * 2005-09-30 2008-09-10 夏普株式会社 Liquid crystal display device and television receiver
JP2011227381A (en) * 2010-04-22 2011-11-10 Victor Co Of Japan Ltd Video display device
US20190302543A1 (en) * 2018-04-02 2019-10-03 Au Optronics Corporation Display device
CN111766737A (en) * 2020-07-30 2020-10-13 京东方科技集团股份有限公司 Display module and display device
CN111999948A (en) * 2020-09-02 2020-11-27 上海中航光电子有限公司 Display panel and display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101263417A (en) * 2005-09-30 2008-09-10 夏普株式会社 Liquid crystal display device and television receiver
JP2011227381A (en) * 2010-04-22 2011-11-10 Victor Co Of Japan Ltd Video display device
US20190302543A1 (en) * 2018-04-02 2019-10-03 Au Optronics Corporation Display device
CN111766737A (en) * 2020-07-30 2020-10-13 京东方科技集团股份有限公司 Display module and display device
CN111999948A (en) * 2020-09-02 2020-11-27 上海中航光电子有限公司 Display panel and display device

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Application publication date: 20220111